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description Publicationkeyboard_double_arrow_right Master thesis 2020Publisher:Fen Bilimleri Enstitüsü Authors: Kulcanay, İlknur;IV SUMMARY In this study research on the alcohol, ether and asetone extracts of this plant {Lavandula stoechas L.), and the mutagenic activity of its oils has been done according to the Ames /Salmonella/Micro some test procedure. Various extracts have been taken from the plants leaf and flower divisions. In the laboratory, the above mantioned test procedure has been done according to the plate incorporation method. The bacterial cultures of Salmonella typhimurium were used as test organisms in the experiments. In addition, the antibacterial effects of the plant' s extracts and oils were researched. At the end of the experiments, it was found that the amount of colonies that the TA98 and TA100 gave were not very different than the amount of colonies that it would have given if the bacteria were allowed to reproduce spontaneously. For this reason, in terms of frame shift and point mutations, it was concluded that our substances were not directly mutagenic effective. When the same procedures were repeated using the metabolic activation enzyme-containing S9 compound, the results were similar to those that came from the S9-free experiment. In this conditation, we can say that the plant does not have a direct mutagenic effect on animals either. In terms of antibacterial effectiveness, it has been concluded that the Bacillus subtilis, Serretia marcescens, Bacillus cereus, Klebsiella pneumania bacteria have been affected by the plant's oils, and leaf and flower extracts but hasn't been concluded that the Escherichia coli, Salmonella typhimurium, Sarcina lutea, Staphylococcus aureus, Enterobacter aerogenes. Ill ÖZET Bu çalışmada tıbbi aromatik bir bitki oları Lavandula stoechas L. (Karabaş otu) bitkisinin etil alkol, aseton, eter ekstreleri ve yağının mutajenik aktiviteleri, Ames/ Salmonella/Mikrozom test yöntemine göre araştırılmıştır. Bitkinin, yaprak ve çiçek kısımlarından olmak üzere ayrı ekstreler elde edilmiştir. Laboratvuar çalışmalarında, sözü edilen test yöntemi, plak inkorporasyon metoduyla uygulanmıştır. Test organizması olarak Salmonella typhimurium' un TA98 ve TA100 suşları kullanılmıştır. Ek olarak, bu bitkisel ekstrelerin ve yağın antibakteriyel etkisi de araştırılmıştır. Deneyler sonucunda bitkisel ekstrelerle TA98 ve TA100 suşlarının verdiği koloni sayıları spontan değerlerden çok farklı olmamıştır. Bu nedenle maddelerimizin çerçeve kayması ve nokta mutasyonlar açısından direkt mutajenik etkili olmadığı saptanmıştır. Aynı işlemler, metabolik aktivasyon enzimlerini içeren S9 bileşimi ile tekrarlandığında S9' suz sonuçlara benzer sonuçlar elde edilmiştir. Bu durumda, bitkinin canlılarda da direkt ve indirekt mutajenik etkisinin olmadığı ortaya çıkmıştır. Bitkinin yaprak ve çiçek ekstreleri ile yağının Bacillus subtilis, Serretia marcescens, Bacillus cereus, Klebsiella pneumania patojen bakterilerine karşı antibakteriyel etkisi görülmüş, Escherichia coli, Salmonella typhimurium, Sarcina lutea, Staphylococcus aureus, Enterobacter aerogenes' e karşı görülmemiştir. 83
YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceMaster thesis . 2020License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Master thesis 2020Publisher:Fen Bilimleri Enstitüsü Authors: Savaş, Seda;ABSTRACT The production of ethanol from starch has been investigated using the genetically modified Saccharomyces cerevisiae strain YPB-G, which secretes a bifunctional fusion protein that contains both the Bacillus subtilis a-amylase and the Aspergillus awamori glucoamylase activities. Substrate utilization, biomass growth, enzyme secretion and ethanol production characteristics of YPB-G were studied in starch containing media in a 2.5-L New Brunswick fermenter. The effect of initial starch concentration as well as glucose or commercial a-amylase and glucoamylase addition were studied in YPS media with and without aeration. Higher amounts of ethanol were obtained when YPB-G was grown in glucose or enzyme supplemented media. Aeration was found to have a positive effect on ethanol production. YPB-G produced 37 g/L and 42 g/L ethanol respectively when 4 g/L glucose was added to 16 g/L and 33 g/L initial starch containing media with aeration. The superior performance of YPB-G in glucose added and aerated YPS medium was found to correlate with its higher levels of a-amylase and glucoamylase activity in YPS media. In the absence of aeration, on the other hand, YPB-G produced 21 g/L and 25 g/L ethanol respectively when 4 g/L glucose was added to 13 g/L and 31 g/L initial starch containing media. Furthermore, in the presence of an enzyme supplement in YPS medium, YPB-G produced 31 g/L ethanol from 37 g/L initial starch without aeration and 48 g/L ethanol from 24 g/L initial starch with aeration. VI ÖZET Genetik mühendisliği teknikleri kullanılarak hazırlanmış, B. subtilis a-amilaz ve A. awamori glukoamilaz geni barındıran ve aynı promoter altından füzyon proteini salgılayan bir rekombinant Saccharomyces cerevisiae YPB-G suşunun nişastadan başlayarak etanol üretimi incelenmiştir. Substrat kullanımı, biyokütle üretimi, enzim salgılama ve etanol üretimi nişasta içeren besi ortamlarında 2.5 L hacminde New Brunswick fermentör koşullarında incelenmiştir. İlk andaki nişasta konsantrasyonu, glikoz veya ticari a-amilaz ve glikoamilaz katkısının YPS besi ortamlarında havalı ve havasız koşullardaki etkileri incelenmiştir. YPB-G suşu glikoz veya enzim katkılı ortamlarda yüksek düzeyde etanol üretmiştir. Havalı koşulların etanol üretimine pozitif etkisi olmuştur. YPB-G suşu 16 g/L ve 33 g/L nişastadan 4 g/L glikoz katıldığında havalı koşullarda sırasıyla 37 g/L ve 42 g/L etanol üretmiştir. YPB-G suşunun glikoz katkılı havalı koşullarda YPS besi ortamında üstünlüğü a-amilaz ve glikoamilaz enzimlerinin yüksek aktivitelerine bağlıdır. Havasız koşullarda ise, YPB-G suşu 13 g/L ve 31 g/L nişastadan 4 g/L glikoz katıldığında sırasıyla 21 g/L ve 25 g/L etanol üretmiştir. Ayrıca, YPS besi ortamına enzim katıldığında, YPB-G suşu havasız koşulda 37 g/L nişastadan 31 g/L etanol, havalı koşulda 24 g/L nişastadan 48 g/L etanol üretmiştir. 82
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2017Embargo end date: 02 Oct 2018 GermanyPublisher:The Electrochemical Society Zachary Lebens-Higgins; Nicholas Faenza; Pinaki Mukherjee; Shawn Sallis; Fadwa Badway; Nathalie Pereira; Christoph Schlueter; Tien-Lin Lee; Frederic Cosandey; Glenn Amatucci; Louis F.J. Piper;For layered oxide cathodes, aluminum doping has widely been shown to improve performance, particularly at high degrees of delithiation. While this has led to increased interest in Al-doped systems, including $\mathrm{LiNi_{0.8}Co_{0.15}Al_{0.05}O_{2}}$ (NCA), the aluminum surface environment has not been thoroughly investigated. Using hard x-ray photoelectron spectroscopy measurements of the Al 1s core region for NCA electrodes, we examined the evolution of the surface aluminum environment under electrochemical and thermal stress. By correlating the aluminum environment to transition metal reduction and electrolyte decomposition, we provide further insight into the cathode-electrolyte interface layer. A remarkable finding is that Al-O coatings in LiPF$_6$ electrolyte mimic the evolution observed for the aluminum surface environment in doped layered oxides. ECS transactions 80(10), 197 - 206 (2017). doi:10.1149/08010.0197ecst Published by Pennington, NJ
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2013 NetherlandsPublisher:American Chemical Society (ACS) Authors: Sterk, A; Schijven, J; de Nijs, T; de Roda Husman, AM;doi: 10.1021/es403549s
pmid: 24125400
Climate change is likely to affect the infectious disease burden from exposure to pathogens in water used for drinking and recreation. Effective intervention measures require quantification of impacts of climate change on the distribution of pathogens in the environment and their potential effects on human health. Objectives of this systematic review were to summarize current knowledge available to estimate how climate change may directly and indirectly affect infection risks due to Campylobacter, Cryptosporidium, norovirus, and Vibrio. Secondary objectives were to prioritize natural processes and interactions that are susceptible to climate change and to identify knowledge gaps. Search strategies were determined based on a conceptual model and scenarios with the main emphasis on The Netherlands. The literature search resulted in a large quantity of publications on climate variables affecting pathogen input and behavior in aquatic environments. However, not all processes and pathogens are evenly covered by the literature, and in many cases, the direction of change is still unclear. To make useful predictions of climate change, it is necessary to combine both negative and positive effects. This review provides an overview of the most important effects of climate change on human health and shows the importance of QMRA to quantify the net effects.
Utrecht University R... arrow_drop_down Web-based Archive of RIVM PublicationsArticle . 2014Data sources: Web-based Archive of RIVM Publicationsadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess RoutesGreen 65 citations 65 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Utrecht University R... arrow_drop_down Web-based Archive of RIVM PublicationsArticle . 2014Data sources: Web-based Archive of RIVM Publicationsadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Master thesis 2021Publisher:Fen Bilimleri Enstitüsü Authors: Saygin, Emel;SUMMARY INVESTIGATION THE EFFECTS OF ETHANOL AND IT'S OXIDATION PRODUCTS ON IRON BASE MATERIAL SAYGINEmel Niğde University Graduate School of Natural and Applied Sciences Department of Chemistry Supervisor : Prof. Dr. Kadriye KAYAKIRILMAZ Co- Adviser : Prof. Dr. Mehmet ERBİL August 2000 105 pages The aim of this study is to determine the inhibition effect of ethanol and it's oxidation product in 0.1 M NaîSO* solution by calculating the polarisation resistance's from current potential curves and observing current time variation at different potentials. Different electrolysis cells in which iron composition is known and platinum have been used as anode and cathode electrodes respectively, electrolysis was carried out in three different electrolyte solutions; 0. 1 M Na2S04 solution, 0. 1 M NaıSO* containing ethanol solution and a solution prepared with 0.1 M Na2S04 containing oxidation products of ethanol. In order to obtain the oxidation products of ethanol an electrolyse circuit in which the anode and the cathode were made of Pt electrodes were used. The electrolyte solutions were prepared from 0.1 M NaıSOt solution mixed with 0.1 M ethanol and different potentials (0.669 V, 0.859 V and 0.979 V) have been applied for different time intervals (10, 20 and 30 minutes). The same experiments have been repeated using the electrolyte solution prepared from acetaldehyde and acetic acids from these experiments, the weight loss in the solution containing ethanol was smaller than theVI weight loss in the 0.1 M NaıSGj solution. According to the results obtained from the solutions being oxidised with the alcohol, it has not been observed a clear regularity while the Rp`1 value for 0.1 M Na2S04 solution's 714 uA/ V.cm2 this value is 400 uA/ V. cm2 for ethanol solution Rp`1 values obtained from ethanol solutions being oxidised is smaller than the Rp`1 values obtained for 0.1 M Na2SC>4 solution. The smallest Rp`1 value has been obtained for ethanol solution being oxidised by applying 0.979 V potential between the electrodes for 20 minutes. Rp`1 value obtained from 0.1 M Na2S04 solution mixed with 0. 1 M acetaldehyde solution is smaller them the Rp`1 value obtained from 0. 1 M Na2SÜ4 solution mixed with 0. 1 M acetic acid solution. According to the experimental results; alcohol and it's oxidation product being adsorbed at the surface inhibits the corrosion to a certain ratio. Oxidation period and potential of 0.1 M Na2SÜ4 solution mixed with 0. 1 M ethanol, had positive effected on inhibition. Key Words: Electrooxidation, Corrosion, Polarisation Resistance, Inhibitor m ÖZET ETANOLUN ve OKSİDAS YON ÜRÜNLERİNİN DEMİRLİ MALZEME ÜZERİNDEKİ ETKİLERİNİN ARAŞTIRILMASI SAYGIN Emel Niğde Üniversitesi Fen Bilimleri Enstitüsü Kimya Ana Bilim Dalı Danışman : Prof. Dr. Kadriye KAYAKIRILMAZ Ortak Danışman : Prof. Dr. Mehmet ERBİL Ağustos 2000 105 Sayfa Etanolun ve oksidasyon ürünlerinin inhibisyon etkinliğini saptamak amacıyla yapılan bu çalışmada, farklı elektroliz hücrelerinde kimyasal bileşimi bilinen demir anot, platin katot kullanılarak 0,1 M Na2S04 çözeltisinde, 0,1 M Na2S04 + 0,1 M etanol çözeltisinde ve alkolün oksidasyon ürünlerini içeren 0,1 M Na2S04 çözeltisinde akım - potansiyel eğrisinden polarizasyon dirençleri hesaplanmış, uygulanan farklı potansiyellerde akım-zaman değişimleri incelenmiş ve demirli malzemenin kütle kaybı saptanmıştır. Etanolun oksidasyon ürünlerini elde etmek için anot ve katotta platin elektrotlar kullanılarak oluşturulan elektroliz devresinde, 0,1 M Na2S04 + 0,1 M etanol çözeltileri ferklı potansiyellerde (0,669 V, 0,859 V ve 0,979 V) farklı sürelerde (10, 20 ve 30 dakika) potansiyel uygulanmıştır. Aynı deneyler asetaldehit ve asetik asitle hazırlanan elektrolit çözeltiler kullanılarak da yapılmıştır. Bu deneylerden elde edilen sonuçlara göre, etanol ve oksidasyon ürünlerinin bulunduğu çözeltilerde kütle kaybı, 0,1 M Na2S04 çözeltisindeki kütle kaybından daha az olmuştur. Oksidasyona uğratılmış alkollü çözeltilerde elde edilen sonuçlara göre inhibisyon etkinliği konusunda belirli bir düzenlilik saptanamamıştır. 0,1 M Na2S04IV çözeltisinde Rp`1 değeri 714 uA/V.cm2 iken, etanollü çözeltide bu değer 400 uA/V.cm2 bulunmuştur. Oksidasyona uğratılmış etanol çözeltilerinde elde edilen Rp`1 değerleri, 0,1 M Na2S04 çözeltisinde elde edilen Rp`1 değerinden daha düşük olmuştur. En düşük Rp`1 değeri 0,979 V potansiyelde 20 ve 30 dakika süreyle oksidasyon uygulanmış etanol çözeltilerinde elde edilmiştir. 0,1 M Na2SÛ4 + 0,1 M asetaldehit çözeltilerinde elde edilen Rp`1 değeri 0,1 M Na2SÛ4 + 0,1 M asetik asit çözeltisinde elde edilen Rp`1 değerinden daha düşük bulunmuştur. Elde edilen bulgulara göre, alkolün ve oksidasyon ürünlerinin elektrot yüzeyinde adsorplanarak korozyonu belirli oranda önlediği sonucuna varılmıştır. 0,1 M Na2SÜ4 + 0,1 M etanol çözeltisine oksidasyon uygulama süresi ve potansiyeli inhibisyon etkinliğini olumlu yönde etkilemiştir. Anahtar Sözcükler: Elektrooksidasyon, Korozyon, Polarizasyon Direnci, inhibitor 105
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 2021Publisher:Sağlık Bilimleri Enstitüsü Authors: Demir, Şerif;vıı ABSTRACT EFFECTS OF ETHANOL ON HIPPOCAMPUS AND CEREBELLUM CELLS Şerif DEMİR, Ph.D. Thesis University of Ondokuz Mayıs Samsun, September 1999 Alcohol is known to cause different degree of damage in different brain regions. Because of the membranes of central nervous system neurons are rich in unsaturated fatty acids and their high oxygen consumption rate, central nervous system neurons are more vulnerable to oxidative stress than other tissues. Lipid peroxidation is a toxic event for biological systems which can be induced as a result of some events caused by ethanol such as an increase in free radical formation or altered the antioxidant system activity. Gluthation and total thiol are the most important components of antioxidant defense system. These two systems protects the organism against the damage induced by free radicals. Present study includes histological and biochemical investigations. Animals separated into two groups each containing 8 animals. These groups were group I (water), group II (10% ethanol), group III (25% ethanol), group IV(35% ethanol), group Ie (100 mg/kg/day i.p. vitamin-E), group He (10% ethanol +100 mg/kg/day Vitamin-E), group Ille (25% ethanol +100 mg/kg/day Vitamin-E) and group IVe (35% ethanol + 100 mg/kg/day Vitamin-E). Lipid peroxidation (TBARS), total thiol (SH) and glutathion (GSH) levels were assessed in brain and cerebellum tissues of ethanol and ethanol+vitamin-E administered animals. After decapitation, heads were taken into artificial cerebrospinal fluid solution (ACSF, +4°C) and brains and cerebella removed in this solution. 200 mg of cerebellum tissues taken from all animals and homogenized in 0.1 M phosphate buffer (pH = 7.4) via and ultrasound homogenizer. 400 mg brain tissues were taken and homogenized via the same manner. Animals used in histologicalvııı studies were perfused inracardially with neutral formalin. Brains removed and embedded in glychol metacrylate embedding medium. Brains were sectioned in horizontal direction with a microtome setting of 40um. Every tenth section contains hippocampus sampled in a systematic random fashion with selecting the first sample section randomly from the first ten sections containing hippocampal tissue. Total number of pyramidal cells in right and left hippocampi were estimated by using optical fractionator counting technique described elsewhere. Total increase in lipid peroxidation in right hemispheres of animals received ethanol (10%, 25% and 35%) were found to be 34%, 32% and 33% respectively and in left hemispheres 37%, 33% and 42% respectively with respect to controls. Percentage of the increase in lipid peroxidation in the brains of animals received ethanol + vitamin- E were 13%, 13% and 16% in right and 11%, 20% and 16% in left hemispheres respectively when compared with control values. Decrase of glutathion in brains of the animals received only ethanol were 19%, 28% and 35% in right and 19%, 29% and 32% in left hemispheres. In ethanol + vitamin-E groups, these values were found to be 6%, 5% and 2% in right and 7%, 7% and 8% in left hemispheres respectively. There were no statistically significant difference between the glutathion levels of ethanol and ethanol + vitamin-E groups. Decreasing ratio of total thiol levels in ethanol intaken groups were 14%, 21% and 20% in right and 15%, 18% and 21% in left hemispheres respectively. In ethanol + vitamin-E groups, these values were 4%, 4% and 9% in right and 4%, 5% and 6% in left hemispheres respectively. Lipid peroxidation levels in cerebellum were assessed after ethanol administration and ratio of lipid peroxidation decreased 58%, 68% and 66% in 10%, 25% and 35% ethanol groups respectively. Decrease in total thiol levels were found to be 5%, 15% and 21% and decrease in glutathion were 23%, 27% and 28% respectively for the same groups. Total number of pyramidal cells in right and left hipocampi were estimated by using one of the latest unbiased an efficient counting and sampling methods, optical fractionator. Rats received ethanol were found to have significant less number of pyramidal neurons when compared with controls. Decrease in total neuron number in 10%, 25% and 35% ethanol groups were 50%, 54% and 66% in right and 52%, 53%IX and 61% in left hippocampi respectively. Vitamin-E administration seemed to prevent cell death in right and left hippocampi. Decrease of the mean total number of pyramidal cells in ethanol + vitamin-E groups (10%, 25% and 35% ethanol + vitamin-E) were found to be 40%, 32% and 27% in right and 40%, 37% and 25% in left hippocampi respectively. Biochemical and histological studies showed that ethanol have neurotoxic effects on central nervous system. Etanol may perform these effects primarily by increasing the lipid peroxidation and altering the antioxidant defence system. In the present study, it has been shown that ethanol may induce an increase in lipid peroxidation in brain and cerebelum and cause a decrease in total thiol levels. Ethanol also showed a neurotoxic effect in hippocampus. Vitamin-E administration decreased lipid peroxidation and increased glutathion and total thiol levels. Different parts of the central nervous system effected by ethanol in different degree. IV ÖZET ETANOLUN HİPOKAMPUS VE SEREBELLUM HÜCRELERİNE ETKİLERİ Şerif DEMİR Ondokuz Mayıs Üniversitesi Samsun, Eylül 1999 Alkolün merkez sinir sisteminin farklı bölgelerinde farklı hasara sebep olduğu bilinmektedir. Merkez sinir sistemi hücre membranlan doymamış yağ asitlerince zengin olması ve oksijen tüketiminin fazla olması nedeniyle oksidatif strese karşı daha duyarlıdır. Lipid peroksidasyon biyolojik sistemler için toksik bir olgudur ve etanol serbest radikal oluşumunu artırarak veya antioksidan sistemi etkileyerek lipid peroksidasyonu oluşturabilir. Glutatyon ve total tiol antioksidan sistemin önemli birimlerindendir. Bu iki sistem canlı organizmayı serbest radikallerin hasarından korur. Çalışma biyokimyasal ve histolojik olarak yapıldı. Hayvanlar 8 gruba ayrıldı. Gruplar sırasıyla Grupl (su) GrupII (%10 etanol), GrupIII (%25 etanol), GrupIV (%35 etanol), Gruple (vit E,100 mg/kg/gün i.p) GrupIIe (Vit E + %10 etanol), GrupIIIe (vit E + %25 etanol), GrupIVe (vit E + %35 etanol) olarak belirlendi Herbir biyokimyasal grupta 10 ar, histolojik grupta 5 er olmak üzere 120 hayvanda yapıldı. Etanol, Vitamin E + etanol verilen sıçanların beyin ve beyinciklerinde lipid peroksidasyon (TBARS), glutatyon(GSH), total tiol (SH) seviyesi araştırıldı. Biyokimyasal çalışma için kullanılan hayvanların kafası kesildikten sonra yapay beyin solüsyonuna (ACSF, 4 °C) alındı. Aynı sıvı içinde beyin ve beyincik çıkarıldı. Beyincik dokusu 0.1 M fosfat tamponunda (pH= 7.4) ultrasound homojenizatörde 200 mg doku olarak homojenize edildi. Beyin hemisferleri ise 400 mg doku olarak homojenize edildi. Histolojik çalışmada kullanılan deney hayvanları intrakardiyal yoldan nötral formalinle perfüze edildi. Beyinler glikol metakrilata gömüldü. Daha sonra bloklar horizontal olarak 40 mikron kalınlığında kesildi. Her 10 kesitten biri alınarak cresyl violet ile boyandı Sağ ve sol hipokampus optik fraksiyonlama tekniğiyle sayıldı.Etanol (%10, %25, %35) verilen sıçan beyinlerinde toplam lipid peroksidasyon artışı sağ hemisferde sırasıyla %34, %32, %33 sol hemisferde ise; %37, %33, %42 oranında bulundu, Etanol + vit E gruplarında lipid peroksidasyon artma yüzdeleri ise; sağ hemisferde; %13, %13, %16; Sol hemisferde ise %11,%20, %16 olarak bulundu. Sadece etanol verilen gruplarda glutatyon azalma yüzdeleri sağ hemisferde; %19, %28, %35; Sol hemisferde ise %19, %29, %32 olarak tespit edildi. Etanol + vit E gruplarında ise sağ hemisferde; %6, %5, %2 sol hemisferde ise; %7, %7, %8 olarak bulundu. Etanol ve etanol + Vit E gruplarının sağ ve sol hemisferinde glutatyon seviyeleri arasında anlamlı bir farklılık yoktu. Total tiol düzeylerinin azalma yüzdeleri etanol verilen gruplarda sağ hemisferde; %14, %21, %20; Sol hemisferde ise %15, %18, %21, olarak tespit edildi. Etanol + vit E gruplarının ise sağ hemisferde; %,4, %4, %9 sol hemisferde ise;her üç grupta sırasıyla %4, %,5, %6, olarak belirlendi. Etanol verildikten sonra beyincikte lipid peroksidasyon düzeylerine bakıldı ve, %10, %25, %35' lik gruplar için azalma yüzdeleri sırasıyla %58, %68, %66 olarak bulundu. Aym gruplar için glutatyon azalma yüzdeleri; %23, %27, %28 olarak bulundu. Total tiol azalma yüzdeleri ise; %5, %15, %21 olarak belirlendi. Etanol alan sıçanların sağ ve sol hipokarnpusunda toplam hücre sayısı güvenilir ve tarafsız stereolojik teknikler (optik fraksiyonlama) kullanılarak tespit edildi. Etanol verilen hayvanların sağ ve sol hipokampuslarında toplam nöron sayılan kontrole göre anlamlı bir şekilde azaldı. %10, %25 ve %35'lik etanol konsantrasyonlarında nöron sayılarındaki azalma sırasıyla; Sağ hipokampusta : %50, %54 ve %66; Sol hipokampusta : %52, %53 ve %61 oramnda tespit edildi. Vitamin E uygulanması sağ ve sol hipkampusta hücre kaybım azaltmıştır. Etanol + vit E gruplarında ( %10, %25, %35 ) sağ hipokampusta %40, %32, %27; sol hipokampusta; %40, %37, %25 oramnda piramidal hücrelerde azalma bulunmuştur. Biyokimyasal ve histolojik çalışmalar etanolun sinir sisteminde nörotoksik etkili olduğunu göstermektedir. Etanol bu etkisini lipit perosidasyonu artırarak ve antioksidan sistemini baskılayarak yapmaktadır. Bu çalışmada etanolun beyinde ve beyincikte lipit peroksidasyonunu artırdığım glutatyon ve total tiol seviyelerini düşürdüğünü bulduk. Hipokampusta ise etenol piramidal hücre kaybına sebepVI olmuştur. Vitamin E verilmesi ise beyin ve beyincikte lipid peroksidasyonu azaltmış gutatyon ve total tiol seviyelerini yükseltmiştir. Merkez sinir sistemi etanolden farklı düzeyde etkilenmektedir. 105
YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceDoctoral thesis . 2021License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2021Publisher:Elsevier BV Authors: María D. Pérez-Cárceles; Eduardo Osuna; M.G. García; Isabel Legaz;Drug-facilitated sexual assault (DFSA) and drug-facilitated crime (DFC) constitute a mode of violence that is generally unknown to the population and may go unnoticed by health professionals. The aim of this systematic review was to analyze the victims of DFC, compiling their sociodemographic characteristics, the toxic substances used and their biological matrices and modes of action, in order to identify the substances that are commonly put to criminal use. The aim would be to establish political and health strategies that inform and warn people about possible criminal social behaviors consequent danger to health. This systematic review was conducted following the PRISMA guidelines. Alcohol, benzodiazepines and cocaine were among the most commonly detected substances. In most of the hospitals, immunoassays, liquid chromatography (LC-MS), or gas chromatography-mass spectrometry (GC-MS) analyses were used to identify the substances, while the most frequently used biological matrices were blood and urine. From a judicial point of view, the instrumental protocols and techniques followed for the detection of toxics in different biological matrices must guarantee the reliability and validity of the results for use in a court of law. The recommendations of international organizations should be followed and must be called upon to strengthen their respective national laws against this chemical submission (CS) phenomenon.
Recolector de Cienci... arrow_drop_down Recolector de Ciencia Abierta, RECOLECTAArticle . 2024Data sources: Recolector de Ciencia Abierta, RECOLECTAJournal of Forensic and Legal MedicineArticle . 2021 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert Recolector de Cienci... arrow_drop_down Recolector de Ciencia Abierta, RECOLECTAArticle . 2024Data sources: Recolector de Ciencia Abierta, RECOLECTAJournal of Forensic and Legal MedicineArticle . 2021 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Master thesis 2020Publisher:Fen Bilimleri Enstitüsü Authors: Doymuş, Kemal;1 1 SUMMARY In this study, the electrokinetic behavior of Karlıova lignite samples, natural, demineralized, and demineralized and oxidized, and the adsorption of CTAB (cetyltrimethyl- ammonium bromide) by these samples have been investigated. The electrokinetic behavior of the coal samples was investigated using micro-electrophoresis cell. The effects of pH and various electrolytes on the zeta potential of the coals were studied. The results obtained, indicate that the zeta potentials of the samples have negative values over a wide pH range (pH=2-13) and that the electrolytes, NaCl,NaN03,BaCl2,CaCİ2,FeS04,FeCİ3 and AİCI3 investigated in this study, except for AICI3, have not reversed the charge of coal surface. The adsorption of CTAB by Karlxova lignite samples; natural, demineralized, and demineralized and oxidized has been investigated through spectrophotometric method. The effects of surfactant concentration, suspensions pH, adsorption time, oxidation degree, mineral matter contents, and adsorption temperature on the adsorption and also the effect of adsorption on the electrokinetic behavior of lignite samples were searched. The adsorption isotherms generally exhibited a Langmuir type behavior. The free energy and the heat and entrop.y of adsorption values and isotherms for adsorption indicated that adsorption occurs through hidrophilic interaction. On the other hand, it is found that the adsorption capacity increases and also that the heats of adsorption decreases with rising temperature for all of the coal samples. ÖZET Bu çalxşmada;Ham, demineralize ve oksitlenmiş demineralize Karlıova linyit örneklerinin elektrokinetik davranışı ve bu örnekler tarafından CTAB (setiltrimetilamonyum Bromür) adsorpsiyonu incelenmiştir. Kömür örneklerinin elektrokinetik davranışı bir mikro- elektrof or'ez hücresi kullanılarak incelendi. Kömür örneklerinin zeta potansiyeli üzerine pH ve çeşitli elektrolitlerin etkisi araştırıldı. Elde edilen sonuçlar, geniş bir pH aralığında (pH=2-13) örneklerin zeta potansiyellerinin negatif değerlere sahip olduğunu ve NaCl,NaN03,BaCİ2,CaCl2,FeCl3 ve AİCI3 gibi elektrolitlerden AICI3 dışındaki elektrolitlerin kömürün yüzey yükünü tersine çevirmediklerini gösterdi. Ham, demineralize ve 150-200°C de oksitlenmiş demineralize örnekler tarafından CTAB adsorpsiyonu spektrofotometrik metodla incelendi.Adsorpsiyon üzerine yüzey aktif madde konsantrasyonu süspansiyon pH sı, adsorpsiyon süresi, oksidasyon derecesi, mineral madde içeriği ve adsorpsiyon sıcaklığının etkisi ve ayrıca linyit örneklerinin zeta potansiyelleri üzerine adsorpsiyonun etkisi araştırıldı. Adsorpsiyon izotermlerinin genelde Langmuir tipi bir.davranış gösterdiği bulundu.Adsorpsiyona ait serbest enerji, adsorpsiyon ısısı ve adsorpsiyon entropisi değerleri ve adsorpsiyon izotermleri; adsorpsiyonun CTAB molekülleri ve kömür yüzeyi arasındaki hidrofilik etkileşmelerle gerçekleştiğini ortaya koymaktadır. Diğer yandan, tüm kömür örnekleri için adsorpsiyon kapasitesinin artan sıcaklıkla arttığı ve adsorpsiyon ısılarının ise azaldığı bulunmuştur. 71
YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceMaster thesis . 2020License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceMaster thesis . 2020License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2019Embargo end date: 20 Dec 2018Publisher:Mendeley Authors: Leganes-Fonteneau, Mateo;Data for: "Interoceptive awareness is associated with acute alcohol-induced changes in mood states" submitted to Pharmacology Biochemistry and Behaviour.
Mendeley Data arrow_drop_down DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert Mendeley Data arrow_drop_down DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2008 NetherlandsPublisher:Elsevier BV Authors: Milisavljevic, V.; Tran, L.P.; Batmalle, C.; Bootsma, H.J.;Staphylococcus epidermidis is the most frequent cause of health care-associated infections, particularly in neonates and patients with indwelling catheters. The pathogenesis of infections caused by this organism is associated with its ability to form biofilms. We hypothesized that alcohol used in skin disinfectants, as well as preservative in solutions administered through catheters, can enhance biofilm formation by S epidermidis.We performed polymerase chain reaction (PCR) analysis to investigate the prevalence of ica locus in a collection of 169 commensal and clinical S epidermidis strains. Using a microtiter plate assay, we examined the effect of ethanol and benzyl alcohol on biofilm production. Quantitative real-time reverse transcriptase PCR analysis evaluated quantitative changes in gene expression.We found that ica-positive but biofilm-negative or low-grade biofilm-positive S epidermidis strains displayed induction or increase in biofilm production after incubation in media supplemented with both ethanol and benzyl alcohol. The expression of the icaADBC operon was up-regulated in the presence of alcohol.Our results suggest that biofilm production and, therefore, the pathogen potential of S epidermidis can be induced by alcohol. Considering the routine use of alcohol-based skin disinfectants and benzyl alcohol-containing solutions in hospitals, the alcohol-inducible biofilm phenotype of S epidermidis has potentially profound clinical ramifications.
Radboud Repository arrow_drop_down American Journal of Infection ControlArticle . 2008 . Peer-reviewedLicense: Elsevier TDMData sources: CrossrefAmerican Journal of Infection ControlArticle . 2008Data sources: DANS (Data Archiving and Networked Services)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess RoutesGreen 29 citations 29 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Radboud Repository arrow_drop_down American Journal of Infection ControlArticle . 2008 . Peer-reviewedLicense: Elsevier TDMData sources: CrossrefAmerican Journal of Infection ControlArticle . 2008Data sources: DANS (Data Archiving and Networked Services)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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description Publicationkeyboard_double_arrow_right Master thesis 2020Publisher:Fen Bilimleri Enstitüsü Authors: Kulcanay, İlknur;IV SUMMARY In this study research on the alcohol, ether and asetone extracts of this plant {Lavandula stoechas L.), and the mutagenic activity of its oils has been done according to the Ames /Salmonella/Micro some test procedure. Various extracts have been taken from the plants leaf and flower divisions. In the laboratory, the above mantioned test procedure has been done according to the plate incorporation method. The bacterial cultures of Salmonella typhimurium were used as test organisms in the experiments. In addition, the antibacterial effects of the plant' s extracts and oils were researched. At the end of the experiments, it was found that the amount of colonies that the TA98 and TA100 gave were not very different than the amount of colonies that it would have given if the bacteria were allowed to reproduce spontaneously. For this reason, in terms of frame shift and point mutations, it was concluded that our substances were not directly mutagenic effective. When the same procedures were repeated using the metabolic activation enzyme-containing S9 compound, the results were similar to those that came from the S9-free experiment. In this conditation, we can say that the plant does not have a direct mutagenic effect on animals either. In terms of antibacterial effectiveness, it has been concluded that the Bacillus subtilis, Serretia marcescens, Bacillus cereus, Klebsiella pneumania bacteria have been affected by the plant's oils, and leaf and flower extracts but hasn't been concluded that the Escherichia coli, Salmonella typhimurium, Sarcina lutea, Staphylococcus aureus, Enterobacter aerogenes. Ill ÖZET Bu çalışmada tıbbi aromatik bir bitki oları Lavandula stoechas L. (Karabaş otu) bitkisinin etil alkol, aseton, eter ekstreleri ve yağının mutajenik aktiviteleri, Ames/ Salmonella/Mikrozom test yöntemine göre araştırılmıştır. Bitkinin, yaprak ve çiçek kısımlarından olmak üzere ayrı ekstreler elde edilmiştir. Laboratvuar çalışmalarında, sözü edilen test yöntemi, plak inkorporasyon metoduyla uygulanmıştır. Test organizması olarak Salmonella typhimurium' un TA98 ve TA100 suşları kullanılmıştır. Ek olarak, bu bitkisel ekstrelerin ve yağın antibakteriyel etkisi de araştırılmıştır. Deneyler sonucunda bitkisel ekstrelerle TA98 ve TA100 suşlarının verdiği koloni sayıları spontan değerlerden çok farklı olmamıştır. Bu nedenle maddelerimizin çerçeve kayması ve nokta mutasyonlar açısından direkt mutajenik etkili olmadığı saptanmıştır. Aynı işlemler, metabolik aktivasyon enzimlerini içeren S9 bileşimi ile tekrarlandığında S9' suz sonuçlara benzer sonuçlar elde edilmiştir. Bu durumda, bitkinin canlılarda da direkt ve indirekt mutajenik etkisinin olmadığı ortaya çıkmıştır. Bitkinin yaprak ve çiçek ekstreleri ile yağının Bacillus subtilis, Serretia marcescens, Bacillus cereus, Klebsiella pneumania patojen bakterilerine karşı antibakteriyel etkisi görülmüş, Escherichia coli, Salmonella typhimurium, Sarcina lutea, Staphylococcus aureus, Enterobacter aerogenes' e karşı görülmemiştir. 83
YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceMaster thesis . 2020License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceMaster thesis . 2020License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Master thesis 2020Publisher:Fen Bilimleri Enstitüsü Authors: Savaş, Seda;ABSTRACT The production of ethanol from starch has been investigated using the genetically modified Saccharomyces cerevisiae strain YPB-G, which secretes a bifunctional fusion protein that contains both the Bacillus subtilis a-amylase and the Aspergillus awamori glucoamylase activities. Substrate utilization, biomass growth, enzyme secretion and ethanol production characteristics of YPB-G were studied in starch containing media in a 2.5-L New Brunswick fermenter. The effect of initial starch concentration as well as glucose or commercial a-amylase and glucoamylase addition were studied in YPS media with and without aeration. Higher amounts of ethanol were obtained when YPB-G was grown in glucose or enzyme supplemented media. Aeration was found to have a positive effect on ethanol production. YPB-G produced 37 g/L and 42 g/L ethanol respectively when 4 g/L glucose was added to 16 g/L and 33 g/L initial starch containing media with aeration. The superior performance of YPB-G in glucose added and aerated YPS medium was found to correlate with its higher levels of a-amylase and glucoamylase activity in YPS media. In the absence of aeration, on the other hand, YPB-G produced 21 g/L and 25 g/L ethanol respectively when 4 g/L glucose was added to 13 g/L and 31 g/L initial starch containing media. Furthermore, in the presence of an enzyme supplement in YPS medium, YPB-G produced 31 g/L ethanol from 37 g/L initial starch without aeration and 48 g/L ethanol from 24 g/L initial starch with aeration. VI ÖZET Genetik mühendisliği teknikleri kullanılarak hazırlanmış, B. subtilis a-amilaz ve A. awamori glukoamilaz geni barındıran ve aynı promoter altından füzyon proteini salgılayan bir rekombinant Saccharomyces cerevisiae YPB-G suşunun nişastadan başlayarak etanol üretimi incelenmiştir. Substrat kullanımı, biyokütle üretimi, enzim salgılama ve etanol üretimi nişasta içeren besi ortamlarında 2.5 L hacminde New Brunswick fermentör koşullarında incelenmiştir. İlk andaki nişasta konsantrasyonu, glikoz veya ticari a-amilaz ve glikoamilaz katkısının YPS besi ortamlarında havalı ve havasız koşullardaki etkileri incelenmiştir. YPB-G suşu glikoz veya enzim katkılı ortamlarda yüksek düzeyde etanol üretmiştir. Havalı koşulların etanol üretimine pozitif etkisi olmuştur. YPB-G suşu 16 g/L ve 33 g/L nişastadan 4 g/L glikoz katıldığında havalı koşullarda sırasıyla 37 g/L ve 42 g/L etanol üretmiştir. YPB-G suşunun glikoz katkılı havalı koşullarda YPS besi ortamında üstünlüğü a-amilaz ve glikoamilaz enzimlerinin yüksek aktivitelerine bağlıdır. Havasız koşullarda ise, YPB-G suşu 13 g/L ve 31 g/L nişastadan 4 g/L glikoz katıldığında sırasıyla 21 g/L ve 25 g/L etanol üretmiştir. Ayrıca, YPS besi ortamına enzim katıldığında, YPB-G suşu havasız koşulda 37 g/L nişastadan 31 g/L etanol, havalı koşulda 24 g/L nişastadan 48 g/L etanol üretmiştir. 82
YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceMaster thesis . 2020License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceMaster thesis . 2020License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2017Embargo end date: 02 Oct 2018 GermanyPublisher:The Electrochemical Society Zachary Lebens-Higgins; Nicholas Faenza; Pinaki Mukherjee; Shawn Sallis; Fadwa Badway; Nathalie Pereira; Christoph Schlueter; Tien-Lin Lee; Frederic Cosandey; Glenn Amatucci; Louis F.J. Piper;For layered oxide cathodes, aluminum doping has widely been shown to improve performance, particularly at high degrees of delithiation. While this has led to increased interest in Al-doped systems, including $\mathrm{LiNi_{0.8}Co_{0.15}Al_{0.05}O_{2}}$ (NCA), the aluminum surface environment has not been thoroughly investigated. Using hard x-ray photoelectron spectroscopy measurements of the Al 1s core region for NCA electrodes, we examined the evolution of the surface aluminum environment under electrochemical and thermal stress. By correlating the aluminum environment to transition metal reduction and electrolyte decomposition, we provide further insight into the cathode-electrolyte interface layer. A remarkable finding is that Al-O coatings in LiPF$_6$ electrolyte mimic the evolution observed for the aluminum surface environment in doped layered oxides. ECS transactions 80(10), 197 - 206 (2017). doi:10.1149/08010.0197ecst Published by Pennington, NJ
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For further information contact us at helpdesk@openaire.euAccess RoutesGreen 4 citations 4 popularity Average influence Average impulse Average Powered by BIP!
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2013 NetherlandsPublisher:American Chemical Society (ACS) Authors: Sterk, A; Schijven, J; de Nijs, T; de Roda Husman, AM;doi: 10.1021/es403549s
pmid: 24125400
Climate change is likely to affect the infectious disease burden from exposure to pathogens in water used for drinking and recreation. Effective intervention measures require quantification of impacts of climate change on the distribution of pathogens in the environment and their potential effects on human health. Objectives of this systematic review were to summarize current knowledge available to estimate how climate change may directly and indirectly affect infection risks due to Campylobacter, Cryptosporidium, norovirus, and Vibrio. Secondary objectives were to prioritize natural processes and interactions that are susceptible to climate change and to identify knowledge gaps. Search strategies were determined based on a conceptual model and scenarios with the main emphasis on The Netherlands. The literature search resulted in a large quantity of publications on climate variables affecting pathogen input and behavior in aquatic environments. However, not all processes and pathogens are evenly covered by the literature, and in many cases, the direction of change is still unclear. To make useful predictions of climate change, it is necessary to combine both negative and positive effects. This review provides an overview of the most important effects of climate change on human health and shows the importance of QMRA to quantify the net effects.
Utrecht University R... arrow_drop_down Web-based Archive of RIVM PublicationsArticle . 2014Data sources: Web-based Archive of RIVM Publicationsadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess RoutesGreen 65 citations 65 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Utrecht University R... arrow_drop_down Web-based Archive of RIVM PublicationsArticle . 2014Data sources: Web-based Archive of RIVM Publicationsadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Master thesis 2021Publisher:Fen Bilimleri Enstitüsü Authors: Saygin, Emel;SUMMARY INVESTIGATION THE EFFECTS OF ETHANOL AND IT'S OXIDATION PRODUCTS ON IRON BASE MATERIAL SAYGINEmel Niğde University Graduate School of Natural and Applied Sciences Department of Chemistry Supervisor : Prof. Dr. Kadriye KAYAKIRILMAZ Co- Adviser : Prof. Dr. Mehmet ERBİL August 2000 105 pages The aim of this study is to determine the inhibition effect of ethanol and it's oxidation product in 0.1 M NaîSO* solution by calculating the polarisation resistance's from current potential curves and observing current time variation at different potentials. Different electrolysis cells in which iron composition is known and platinum have been used as anode and cathode electrodes respectively, electrolysis was carried out in three different electrolyte solutions; 0. 1 M Na2S04 solution, 0. 1 M NaıSO* containing ethanol solution and a solution prepared with 0.1 M Na2S04 containing oxidation products of ethanol. In order to obtain the oxidation products of ethanol an electrolyse circuit in which the anode and the cathode were made of Pt electrodes were used. The electrolyte solutions were prepared from 0.1 M NaıSOt solution mixed with 0.1 M ethanol and different potentials (0.669 V, 0.859 V and 0.979 V) have been applied for different time intervals (10, 20 and 30 minutes). The same experiments have been repeated using the electrolyte solution prepared from acetaldehyde and acetic acids from these experiments, the weight loss in the solution containing ethanol was smaller than theVI weight loss in the 0.1 M NaıSGj solution. According to the results obtained from the solutions being oxidised with the alcohol, it has not been observed a clear regularity while the Rp`1 value for 0.1 M Na2S04 solution's 714 uA/ V.cm2 this value is 400 uA/ V. cm2 for ethanol solution Rp`1 values obtained from ethanol solutions being oxidised is smaller than the Rp`1 values obtained for 0.1 M Na2SC>4 solution. The smallest Rp`1 value has been obtained for ethanol solution being oxidised by applying 0.979 V potential between the electrodes for 20 minutes. Rp`1 value obtained from 0.1 M Na2S04 solution mixed with 0. 1 M acetaldehyde solution is smaller them the Rp`1 value obtained from 0. 1 M Na2SÜ4 solution mixed with 0. 1 M acetic acid solution. According to the experimental results; alcohol and it's oxidation product being adsorbed at the surface inhibits the corrosion to a certain ratio. Oxidation period and potential of 0.1 M Na2SÜ4 solution mixed with 0. 1 M ethanol, had positive effected on inhibition. Key Words: Electrooxidation, Corrosion, Polarisation Resistance, Inhibitor m ÖZET ETANOLUN ve OKSİDAS YON ÜRÜNLERİNİN DEMİRLİ MALZEME ÜZERİNDEKİ ETKİLERİNİN ARAŞTIRILMASI SAYGIN Emel Niğde Üniversitesi Fen Bilimleri Enstitüsü Kimya Ana Bilim Dalı Danışman : Prof. Dr. Kadriye KAYAKIRILMAZ Ortak Danışman : Prof. Dr. Mehmet ERBİL Ağustos 2000 105 Sayfa Etanolun ve oksidasyon ürünlerinin inhibisyon etkinliğini saptamak amacıyla yapılan bu çalışmada, farklı elektroliz hücrelerinde kimyasal bileşimi bilinen demir anot, platin katot kullanılarak 0,1 M Na2S04 çözeltisinde, 0,1 M Na2S04 + 0,1 M etanol çözeltisinde ve alkolün oksidasyon ürünlerini içeren 0,1 M Na2S04 çözeltisinde akım - potansiyel eğrisinden polarizasyon dirençleri hesaplanmış, uygulanan farklı potansiyellerde akım-zaman değişimleri incelenmiş ve demirli malzemenin kütle kaybı saptanmıştır. Etanolun oksidasyon ürünlerini elde etmek için anot ve katotta platin elektrotlar kullanılarak oluşturulan elektroliz devresinde, 0,1 M Na2S04 + 0,1 M etanol çözeltileri ferklı potansiyellerde (0,669 V, 0,859 V ve 0,979 V) farklı sürelerde (10, 20 ve 30 dakika) potansiyel uygulanmıştır. Aynı deneyler asetaldehit ve asetik asitle hazırlanan elektrolit çözeltiler kullanılarak da yapılmıştır. Bu deneylerden elde edilen sonuçlara göre, etanol ve oksidasyon ürünlerinin bulunduğu çözeltilerde kütle kaybı, 0,1 M Na2S04 çözeltisindeki kütle kaybından daha az olmuştur. Oksidasyona uğratılmış alkollü çözeltilerde elde edilen sonuçlara göre inhibisyon etkinliği konusunda belirli bir düzenlilik saptanamamıştır. 0,1 M Na2S04IV çözeltisinde Rp`1 değeri 714 uA/V.cm2 iken, etanollü çözeltide bu değer 400 uA/V.cm2 bulunmuştur. Oksidasyona uğratılmış etanol çözeltilerinde elde edilen Rp`1 değerleri, 0,1 M Na2S04 çözeltisinde elde edilen Rp`1 değerinden daha düşük olmuştur. En düşük Rp`1 değeri 0,979 V potansiyelde 20 ve 30 dakika süreyle oksidasyon uygulanmış etanol çözeltilerinde elde edilmiştir. 0,1 M Na2SÛ4 + 0,1 M asetaldehit çözeltilerinde elde edilen Rp`1 değeri 0,1 M Na2SÛ4 + 0,1 M asetik asit çözeltisinde elde edilen Rp`1 değerinden daha düşük bulunmuştur. Elde edilen bulgulara göre, alkolün ve oksidasyon ürünlerinin elektrot yüzeyinde adsorplanarak korozyonu belirli oranda önlediği sonucuna varılmıştır. 0,1 M Na2SÜ4 + 0,1 M etanol çözeltisine oksidasyon uygulama süresi ve potansiyeli inhibisyon etkinliğini olumlu yönde etkilemiştir. Anahtar Sözcükler: Elektrooksidasyon, Korozyon, Polarizasyon Direnci, inhibitor 105
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Doctoral thesis 2021Publisher:Sağlık Bilimleri Enstitüsü Authors: Demir, Şerif;vıı ABSTRACT EFFECTS OF ETHANOL ON HIPPOCAMPUS AND CEREBELLUM CELLS Şerif DEMİR, Ph.D. Thesis University of Ondokuz Mayıs Samsun, September 1999 Alcohol is known to cause different degree of damage in different brain regions. Because of the membranes of central nervous system neurons are rich in unsaturated fatty acids and their high oxygen consumption rate, central nervous system neurons are more vulnerable to oxidative stress than other tissues. Lipid peroxidation is a toxic event for biological systems which can be induced as a result of some events caused by ethanol such as an increase in free radical formation or altered the antioxidant system activity. Gluthation and total thiol are the most important components of antioxidant defense system. These two systems protects the organism against the damage induced by free radicals. Present study includes histological and biochemical investigations. Animals separated into two groups each containing 8 animals. These groups were group I (water), group II (10% ethanol), group III (25% ethanol), group IV(35% ethanol), group Ie (100 mg/kg/day i.p. vitamin-E), group He (10% ethanol +100 mg/kg/day Vitamin-E), group Ille (25% ethanol +100 mg/kg/day Vitamin-E) and group IVe (35% ethanol + 100 mg/kg/day Vitamin-E). Lipid peroxidation (TBARS), total thiol (SH) and glutathion (GSH) levels were assessed in brain and cerebellum tissues of ethanol and ethanol+vitamin-E administered animals. After decapitation, heads were taken into artificial cerebrospinal fluid solution (ACSF, +4°C) and brains and cerebella removed in this solution. 200 mg of cerebellum tissues taken from all animals and homogenized in 0.1 M phosphate buffer (pH = 7.4) via and ultrasound homogenizer. 400 mg brain tissues were taken and homogenized via the same manner. Animals used in histologicalvııı studies were perfused inracardially with neutral formalin. Brains removed and embedded in glychol metacrylate embedding medium. Brains were sectioned in horizontal direction with a microtome setting of 40um. Every tenth section contains hippocampus sampled in a systematic random fashion with selecting the first sample section randomly from the first ten sections containing hippocampal tissue. Total number of pyramidal cells in right and left hippocampi were estimated by using optical fractionator counting technique described elsewhere. Total increase in lipid peroxidation in right hemispheres of animals received ethanol (10%, 25% and 35%) were found to be 34%, 32% and 33% respectively and in left hemispheres 37%, 33% and 42% respectively with respect to controls. Percentage of the increase in lipid peroxidation in the brains of animals received ethanol + vitamin- E were 13%, 13% and 16% in right and 11%, 20% and 16% in left hemispheres respectively when compared with control values. Decrase of glutathion in brains of the animals received only ethanol were 19%, 28% and 35% in right and 19%, 29% and 32% in left hemispheres. In ethanol + vitamin-E groups, these values were found to be 6%, 5% and 2% in right and 7%, 7% and 8% in left hemispheres respectively. There were no statistically significant difference between the glutathion levels of ethanol and ethanol + vitamin-E groups. Decreasing ratio of total thiol levels in ethanol intaken groups were 14%, 21% and 20% in right and 15%, 18% and 21% in left hemispheres respectively. In ethanol + vitamin-E groups, these values were 4%, 4% and 9% in right and 4%, 5% and 6% in left hemispheres respectively. Lipid peroxidation levels in cerebellum were assessed after ethanol administration and ratio of lipid peroxidation decreased 58%, 68% and 66% in 10%, 25% and 35% ethanol groups respectively. Decrease in total thiol levels were found to be 5%, 15% and 21% and decrease in glutathion were 23%, 27% and 28% respectively for the same groups. Total number of pyramidal cells in right and left hipocampi were estimated by using one of the latest unbiased an efficient counting and sampling methods, optical fractionator. Rats received ethanol were found to have significant less number of pyramidal neurons when compared with controls. Decrease in total neuron number in 10%, 25% and 35% ethanol groups were 50%, 54% and 66% in right and 52%, 53%IX and 61% in left hippocampi respectively. Vitamin-E administration seemed to prevent cell death in right and left hippocampi. Decrease of the mean total number of pyramidal cells in ethanol + vitamin-E groups (10%, 25% and 35% ethanol + vitamin-E) were found to be 40%, 32% and 27% in right and 40%, 37% and 25% in left hippocampi respectively. Biochemical and histological studies showed that ethanol have neurotoxic effects on central nervous system. Etanol may perform these effects primarily by increasing the lipid peroxidation and altering the antioxidant defence system. In the present study, it has been shown that ethanol may induce an increase in lipid peroxidation in brain and cerebelum and cause a decrease in total thiol levels. Ethanol also showed a neurotoxic effect in hippocampus. Vitamin-E administration decreased lipid peroxidation and increased glutathion and total thiol levels. Different parts of the central nervous system effected by ethanol in different degree. IV ÖZET ETANOLUN HİPOKAMPUS VE SEREBELLUM HÜCRELERİNE ETKİLERİ Şerif DEMİR Ondokuz Mayıs Üniversitesi Samsun, Eylül 1999 Alkolün merkez sinir sisteminin farklı bölgelerinde farklı hasara sebep olduğu bilinmektedir. Merkez sinir sistemi hücre membranlan doymamış yağ asitlerince zengin olması ve oksijen tüketiminin fazla olması nedeniyle oksidatif strese karşı daha duyarlıdır. Lipid peroksidasyon biyolojik sistemler için toksik bir olgudur ve etanol serbest radikal oluşumunu artırarak veya antioksidan sistemi etkileyerek lipid peroksidasyonu oluşturabilir. Glutatyon ve total tiol antioksidan sistemin önemli birimlerindendir. Bu iki sistem canlı organizmayı serbest radikallerin hasarından korur. Çalışma biyokimyasal ve histolojik olarak yapıldı. Hayvanlar 8 gruba ayrıldı. Gruplar sırasıyla Grupl (su) GrupII (%10 etanol), GrupIII (%25 etanol), GrupIV (%35 etanol), Gruple (vit E,100 mg/kg/gün i.p) GrupIIe (Vit E + %10 etanol), GrupIIIe (vit E + %25 etanol), GrupIVe (vit E + %35 etanol) olarak belirlendi Herbir biyokimyasal grupta 10 ar, histolojik grupta 5 er olmak üzere 120 hayvanda yapıldı. Etanol, Vitamin E + etanol verilen sıçanların beyin ve beyinciklerinde lipid peroksidasyon (TBARS), glutatyon(GSH), total tiol (SH) seviyesi araştırıldı. Biyokimyasal çalışma için kullanılan hayvanların kafası kesildikten sonra yapay beyin solüsyonuna (ACSF, 4 °C) alındı. Aynı sıvı içinde beyin ve beyincik çıkarıldı. Beyincik dokusu 0.1 M fosfat tamponunda (pH= 7.4) ultrasound homojenizatörde 200 mg doku olarak homojenize edildi. Beyin hemisferleri ise 400 mg doku olarak homojenize edildi. Histolojik çalışmada kullanılan deney hayvanları intrakardiyal yoldan nötral formalinle perfüze edildi. Beyinler glikol metakrilata gömüldü. Daha sonra bloklar horizontal olarak 40 mikron kalınlığında kesildi. Her 10 kesitten biri alınarak cresyl violet ile boyandı Sağ ve sol hipokampus optik fraksiyonlama tekniğiyle sayıldı.Etanol (%10, %25, %35) verilen sıçan beyinlerinde toplam lipid peroksidasyon artışı sağ hemisferde sırasıyla %34, %32, %33 sol hemisferde ise; %37, %33, %42 oranında bulundu, Etanol + vit E gruplarında lipid peroksidasyon artma yüzdeleri ise; sağ hemisferde; %13, %13, %16; Sol hemisferde ise %11,%20, %16 olarak bulundu. Sadece etanol verilen gruplarda glutatyon azalma yüzdeleri sağ hemisferde; %19, %28, %35; Sol hemisferde ise %19, %29, %32 olarak tespit edildi. Etanol + vit E gruplarında ise sağ hemisferde; %6, %5, %2 sol hemisferde ise; %7, %7, %8 olarak bulundu. Etanol ve etanol + Vit E gruplarının sağ ve sol hemisferinde glutatyon seviyeleri arasında anlamlı bir farklılık yoktu. Total tiol düzeylerinin azalma yüzdeleri etanol verilen gruplarda sağ hemisferde; %14, %21, %20; Sol hemisferde ise %15, %18, %21, olarak tespit edildi. Etanol + vit E gruplarının ise sağ hemisferde; %,4, %4, %9 sol hemisferde ise;her üç grupta sırasıyla %4, %,5, %6, olarak belirlendi. Etanol verildikten sonra beyincikte lipid peroksidasyon düzeylerine bakıldı ve, %10, %25, %35' lik gruplar için azalma yüzdeleri sırasıyla %58, %68, %66 olarak bulundu. Aym gruplar için glutatyon azalma yüzdeleri; %23, %27, %28 olarak bulundu. Total tiol azalma yüzdeleri ise; %5, %15, %21 olarak belirlendi. Etanol alan sıçanların sağ ve sol hipokarnpusunda toplam hücre sayısı güvenilir ve tarafsız stereolojik teknikler (optik fraksiyonlama) kullanılarak tespit edildi. Etanol verilen hayvanların sağ ve sol hipokampuslarında toplam nöron sayılan kontrole göre anlamlı bir şekilde azaldı. %10, %25 ve %35'lik etanol konsantrasyonlarında nöron sayılarındaki azalma sırasıyla; Sağ hipokampusta : %50, %54 ve %66; Sol hipokampusta : %52, %53 ve %61 oramnda tespit edildi. Vitamin E uygulanması sağ ve sol hipkampusta hücre kaybım azaltmıştır. Etanol + vit E gruplarında ( %10, %25, %35 ) sağ hipokampusta %40, %32, %27; sol hipokampusta; %40, %37, %25 oramnda piramidal hücrelerde azalma bulunmuştur. Biyokimyasal ve histolojik çalışmalar etanolun sinir sisteminde nörotoksik etkili olduğunu göstermektedir. Etanol bu etkisini lipit perosidasyonu artırarak ve antioksidan sistemini baskılayarak yapmaktadır. Bu çalışmada etanolun beyinde ve beyincikte lipit peroksidasyonunu artırdığım glutatyon ve total tiol seviyelerini düşürdüğünü bulduk. Hipokampusta ise etenol piramidal hücre kaybına sebepVI olmuştur. Vitamin E verilmesi ise beyin ve beyincikte lipid peroksidasyonu azaltmış gutatyon ve total tiol seviyelerini yükseltmiştir. Merkez sinir sistemi etanolden farklı düzeyde etkilenmektedir. 105
YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceDoctoral thesis . 2021License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceDoctoral thesis . 2021License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2021Publisher:Elsevier BV Authors: María D. Pérez-Cárceles; Eduardo Osuna; M.G. García; Isabel Legaz;Drug-facilitated sexual assault (DFSA) and drug-facilitated crime (DFC) constitute a mode of violence that is generally unknown to the population and may go unnoticed by health professionals. The aim of this systematic review was to analyze the victims of DFC, compiling their sociodemographic characteristics, the toxic substances used and their biological matrices and modes of action, in order to identify the substances that are commonly put to criminal use. The aim would be to establish political and health strategies that inform and warn people about possible criminal social behaviors consequent danger to health. This systematic review was conducted following the PRISMA guidelines. Alcohol, benzodiazepines and cocaine were among the most commonly detected substances. In most of the hospitals, immunoassays, liquid chromatography (LC-MS), or gas chromatography-mass spectrometry (GC-MS) analyses were used to identify the substances, while the most frequently used biological matrices were blood and urine. From a judicial point of view, the instrumental protocols and techniques followed for the detection of toxics in different biological matrices must guarantee the reliability and validity of the results for use in a court of law. The recommendations of international organizations should be followed and must be called upon to strengthen their respective national laws against this chemical submission (CS) phenomenon.
Recolector de Cienci... arrow_drop_down Recolector de Ciencia Abierta, RECOLECTAArticle . 2024Data sources: Recolector de Ciencia Abierta, RECOLECTAJournal of Forensic and Legal MedicineArticle . 2021 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert Recolector de Cienci... arrow_drop_down Recolector de Ciencia Abierta, RECOLECTAArticle . 2024Data sources: Recolector de Ciencia Abierta, RECOLECTAJournal of Forensic and Legal MedicineArticle . 2021 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Master thesis 2020Publisher:Fen Bilimleri Enstitüsü Authors: Doymuş, Kemal;1 1 SUMMARY In this study, the electrokinetic behavior of Karlıova lignite samples, natural, demineralized, and demineralized and oxidized, and the adsorption of CTAB (cetyltrimethyl- ammonium bromide) by these samples have been investigated. The electrokinetic behavior of the coal samples was investigated using micro-electrophoresis cell. The effects of pH and various electrolytes on the zeta potential of the coals were studied. The results obtained, indicate that the zeta potentials of the samples have negative values over a wide pH range (pH=2-13) and that the electrolytes, NaCl,NaN03,BaCl2,CaCİ2,FeS04,FeCİ3 and AİCI3 investigated in this study, except for AICI3, have not reversed the charge of coal surface. The adsorption of CTAB by Karlxova lignite samples; natural, demineralized, and demineralized and oxidized has been investigated through spectrophotometric method. The effects of surfactant concentration, suspensions pH, adsorption time, oxidation degree, mineral matter contents, and adsorption temperature on the adsorption and also the effect of adsorption on the electrokinetic behavior of lignite samples were searched. The adsorption isotherms generally exhibited a Langmuir type behavior. The free energy and the heat and entrop.y of adsorption values and isotherms for adsorption indicated that adsorption occurs through hidrophilic interaction. On the other hand, it is found that the adsorption capacity increases and also that the heats of adsorption decreases with rising temperature for all of the coal samples. ÖZET Bu çalxşmada;Ham, demineralize ve oksitlenmiş demineralize Karlıova linyit örneklerinin elektrokinetik davranışı ve bu örnekler tarafından CTAB (setiltrimetilamonyum Bromür) adsorpsiyonu incelenmiştir. Kömür örneklerinin elektrokinetik davranışı bir mikro- elektrof or'ez hücresi kullanılarak incelendi. Kömür örneklerinin zeta potansiyeli üzerine pH ve çeşitli elektrolitlerin etkisi araştırıldı. Elde edilen sonuçlar, geniş bir pH aralığında (pH=2-13) örneklerin zeta potansiyellerinin negatif değerlere sahip olduğunu ve NaCl,NaN03,BaCİ2,CaCl2,FeCl3 ve AİCI3 gibi elektrolitlerden AICI3 dışındaki elektrolitlerin kömürün yüzey yükünü tersine çevirmediklerini gösterdi. Ham, demineralize ve 150-200°C de oksitlenmiş demineralize örnekler tarafından CTAB adsorpsiyonu spektrofotometrik metodla incelendi.Adsorpsiyon üzerine yüzey aktif madde konsantrasyonu süspansiyon pH sı, adsorpsiyon süresi, oksidasyon derecesi, mineral madde içeriği ve adsorpsiyon sıcaklığının etkisi ve ayrıca linyit örneklerinin zeta potansiyelleri üzerine adsorpsiyonun etkisi araştırıldı. Adsorpsiyon izotermlerinin genelde Langmuir tipi bir.davranış gösterdiği bulundu.Adsorpsiyona ait serbest enerji, adsorpsiyon ısısı ve adsorpsiyon entropisi değerleri ve adsorpsiyon izotermleri; adsorpsiyonun CTAB molekülleri ve kömür yüzeyi arasındaki hidrofilik etkileşmelerle gerçekleştiğini ortaya koymaktadır. Diğer yandan, tüm kömür örnekleri için adsorpsiyon kapasitesinin artan sıcaklıkla arttığı ve adsorpsiyon ısılarının ise azaldığı bulunmuştur. 71
YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceMaster thesis . 2020License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert YÖK Açık Bilim - CoH... arrow_drop_down YÖK Açık Bilim - CoHE Open ScienceMaster thesis . 2020License: CC BYData sources: YÖK Açık Bilim - CoHE Open Scienceadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2019Embargo end date: 20 Dec 2018Publisher:Mendeley Authors: Leganes-Fonteneau, Mateo;Data for: "Interoceptive awareness is associated with acute alcohol-induced changes in mood states" submitted to Pharmacology Biochemistry and Behaviour.
Mendeley Data arrow_drop_down DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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more_vert Mendeley Data arrow_drop_down DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)DANS (Data Archiving and Networked Services)DatasetData sources: DANS (Data Archiving and Networked Services)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2008 NetherlandsPublisher:Elsevier BV Authors: Milisavljevic, V.; Tran, L.P.; Batmalle, C.; Bootsma, H.J.;Staphylococcus epidermidis is the most frequent cause of health care-associated infections, particularly in neonates and patients with indwelling catheters. The pathogenesis of infections caused by this organism is associated with its ability to form biofilms. We hypothesized that alcohol used in skin disinfectants, as well as preservative in solutions administered through catheters, can enhance biofilm formation by S epidermidis.We performed polymerase chain reaction (PCR) analysis to investigate the prevalence of ica locus in a collection of 169 commensal and clinical S epidermidis strains. Using a microtiter plate assay, we examined the effect of ethanol and benzyl alcohol on biofilm production. Quantitative real-time reverse transcriptase PCR analysis evaluated quantitative changes in gene expression.We found that ica-positive but biofilm-negative or low-grade biofilm-positive S epidermidis strains displayed induction or increase in biofilm production after incubation in media supplemented with both ethanol and benzyl alcohol. The expression of the icaADBC operon was up-regulated in the presence of alcohol.Our results suggest that biofilm production and, therefore, the pathogen potential of S epidermidis can be induced by alcohol. Considering the routine use of alcohol-based skin disinfectants and benzyl alcohol-containing solutions in hospitals, the alcohol-inducible biofilm phenotype of S epidermidis has potentially profound clinical ramifications.
Radboud Repository arrow_drop_down American Journal of Infection ControlArticle . 2008 . Peer-reviewedLicense: Elsevier TDMData sources: CrossrefAmerican Journal of Infection ControlArticle . 2008Data sources: DANS (Data Archiving and Networked Services)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess RoutesGreen 29 citations 29 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Radboud Repository arrow_drop_down American Journal of Infection ControlArticle . 2008 . Peer-reviewedLicense: Elsevier TDMData sources: CrossrefAmerican Journal of Infection ControlArticle . 2008Data sources: DANS (Data Archiving and Networked Services)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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