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The purpose of this study was to investigate the influence of increasing sulfate concentrations on chromium removal, to evaluate the effect of the presence of Cr(VI) on sulfate removal by Streptomyces sp. MC1 and to analyze the differential protein expression profile in the presence of this metal for the identification of proteins repressed or overexpressed. In the presence of Cr(VI) but in the absence of sulfate ions, bacterial growth was negligible, showing the Cr(VI) toxicity for this bacterium. However, the sulfate presence stimulated bacterium growth and Cr(VI) removal, regardless of its concentrations. Streptomyces sp. MC1 showed ability to remove chromium and sulfate simultaneously. Also, the sulfate presence favored the decrease of total chromium concentration from supernatants reaching a decrease of 50% at 48 h. In presence of chromium, seven proteins were down‐expressed and showed homology to proteins involved in protein biosynthesis, energy production and free radicals detoxification while two proteins involved in oxidation‐reduction processes identified as dihydrolipoamide dehydrogenase and S‐adenosyl‐l‐methionine synthase were overexpressed.

Summary Past climatic fluctuations have played a major role in shaping the current plant biodiversity. Although harbouring an exceptional biota, oceanic islands have received little attention in studies on species demographic history and past vegetation patterns. We investigated the impact of past climatic changes on the effective population size of a tree (Coffea mauritiana) that is endemic to Reunion Island, located in the south‐western Indian Ocean (SWIO). Demographic changes were inferred using summary statistics calculated from genomic data. Using ecological niche modelling and the current distribution of genetic diversity, the paleodistribution of the species was also assessed. A reduction in the effective population size of C. mauritiana during the last glaciation maximum was inferred. The distribution of the species was reduced on the western side of the island, due to low rainfall. It appeared that a major reduction in rainfall and a slight temperature decrease prevailed in the SWIO. Our findings indicated that analyses on the current patterns of intraspecific genetic variations can efficiently contribute to past climatic changes characterisation in remote islands. Identifying area with higher resilience in oceanic islands could provide guidance in forest management and conservation faced to the global climate change.

Excessive ethanol ingestion causes gastric mucosal damage through the inflammatory and oxidative processes. The present study was aimed to evaluate the protective effect of thalidomide on ethanol-induced gastric mucosal damage in mice. The animals were pretreated with vehicle or thalidomide (30 or 60 mg/kg, orally), and one hour later, the gastric mucosal injury was induced by oral administration of acidified ethanol. The animals were euthanized one hour after ethanol ingestion, and gastric tissues were collected to biochemical analyzes. The gastric mucosal lesions were assessed by macroscopic and histopathological examinations. The results showed that treatment of mice with thalidomide prior to the administration of ethanol dose-dependently reduced the gastric ulcer index. Thalidomide pretreatment significantly reduced the levels of pro-inflammatory cytokines [tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6], malondialdehyde (MDA) and myeloperoxidase (MPO) activity. In addition, thalidomide significantly inhibited ethanol-induced nitric oxide (NO) overproduction in gastric tissue. Histological observations showed that ethanol-induced gastric mucosal damage was attenuated by thalidomide pretreatment. It seems that thalidomide as an anti-inflammatory agent may have a protective effect against alcohol-induced mucosal damage by inhibition of neutrophil infiltration and reducing the production of nitric oxide and inflammatory cytokines in gastric tissue.

The increasing demand for lignocellulosic biomass for the production of biofuels provides value to vegetative plant tissue and leads to a paradigm shift for optimizing plant architecture in bioenergy crops. Plant height (PHT) is among the most important biomass yield components and is the focus of this review, with emphasis on the energy grasses maize (Zea mays) and sorghum (Sorghum bicolor). We discuss the scientific advances in the identification of PHT quantitative trait loci (QTLs) and the understanding of pathways and genes controlling PHT, especially gibberellins and brassinosteroids. We consider pleiotropic effects of QTLs or genes affecting PHT on other agronomically important traits and, finally, we discuss strategies for applying this knowledge to the improvement of dual-purpose or dedicated bioenergy crops.

Fatty liver diseases are the most common and major health concern arises from the modern lifestyle and alcohol (ethanol) abuse. The prevalence of non-alcoholic fatty liver diseases (NAFLD) has been observed prominently in obese and diabetic individuals, while alcoholic liver disease is common in alcoholic persons. Fatty liver disease, such as steatohepatitis, leads to fibrosis, cirrhosis and eventually hepatocellular carcinoma. The present study was designed to investigate the effect of 7,8-Dihydroxyflavone (7,8-DHF) against high-fat diet (HFD) and ethanol (EtOH)-induced hepatotoxicity in rats.Male Wistar rats (150-200 g) were fed HFD (58% calories from fat) and EtOH (3-15% in drinking water) for 12 weeks. 7,8-DHF was administered intraperitoneally at the dose of 5 mg/kg/day for the last four weeks. After 12 weeks, biochemical, ELISA, RT-PCR, and histological studies have been carried out.Biochemical analyses revealed the involvement of oxidative stress and inflammation in the liver of HFD and EtOH-fed rats. 7,8-DHF treatment significantly reduced HFD and EtOH-induced oxidative stress as evidenced by the reduction of lipid peroxidation and augmentation of reduced glutathione level. Moreover, IL-1β level was found significantly reduced in 7,8-DHF treated EtOH, HFD and EtOH+HFD groups. The semi-quantitative RT-PCR results indicated down-regulation of Nrf-2 and HO-1 and up-regulation of NF-κB and iNOS mRNA expression level in the liver of HFD and EtOH-fed rats, which was ameliorated by 7,8-DHF treatment.The present study suggested that 7,8-DHF could be an effective pharmacological intervention in combating HFD and EtOH-induced hepatotoxicity.

Human diamine oxidase (hDAO, EC 1.4.3.22) is the key enzyme in the degradation of extracellular histamine. Consumption of alcohol is a known trigger of mast cell degranulation in patients with mast cell activation syndrome. Ethanol may also interfere with enzymatic histamine degradation, but reports on the effects on DAO activity are controversial. There are also conflicting reports whether disulfiram, an FDA-approved agent in the treatment of alcohol dependence, inhibits DAO. We therefore investigated the inhibitory potential of ethanol and disulfiram and their metabolites on recombinant human DAO (rhDAO) in three different assay systems. Relevant concentrations of ethanol, acetaldehyde, and acetate did not inhibit rhDAO activity in an in vitro assay system using horseradish peroxidase (HRP) -mediated luminol oxidation. The aldehyde dehydrogenase (ALDH; EC 1.2.1.3) inhibitors cyanamide and its dimer dicyanamide also had no effect on DAO activity. In one assay system, the irreversible ALDH inhibitor disulfiram and its main metabolite diethyldithiocarbamate seemed to inhibit DAO activity. However, the decreased product formation was not due to a direct block of DAO activity but resulted from inhibition of peroxidase employed in the coupled system. Our in vitro data do not support a direct blocking effect of ethanol, disulfiram, and their metabolites on DAO activity in vivo.

The diurnal variation of intermediary metabolites and hormones was determined, as 24-h profiles, in a group of subjects with mixed hypertriglyceridemia while consuming a diet with excess alcohol and caloric intake (Hyp-I) or after a hypotriglyceridemic diet (Hyp-II), and in normal controls. Alcohol was excluded from the hypotriglyceridemic diet and on the days of the study. Hyp-I subjects showed higher 24-h levels of plasma triglyceride, glucose, insulin, lactate, pyruvate, free fatty acid and glycerol. After the hypotriglyceridemic diet the levels of pyruvate, free-fatty acids and glycerol in plasma were normalized, while triglyceride, insulin and glucose concentrations were significantly reduced but remained still higher than in controls. The elevated lactate concentration in Hyp-I subjects were unaffected by the diet. In Hyp-I subjects free-fatty acids and glycerol levels were not suppressed following the meal, in contrast to controls. After the diet this defect in the suppression of endogenous lipolysis was only partially reversed in Hyp-II subjects. Plasma alanine, total ketone body and glucagon concentrations were unaffected. In conclusion, in mixed hypertriglyceridemia high lactate concentration and a defect in the suppression of endogenous lipolysis after a meal could represent a factor enhancing triglyceride production.

The effects of Curcuma longa rhizome on hepatic cells, glycogen, connective tissue fibres and filamentous cytoskeleton were evaluated following KBrO3-induced liver injury in Wistar rats. Thirty-five male rats were randomly divided into seven groups (n=5). Group 1 were normal saline treated rats. Hepatic injury was induced in groups 2 to 7 by oral administration of 100mg/kg KBrO3 for 2 weeks. Following induction, rats in group 2 were sacrificed while groups 3, 4, 5 were given oral dose of EECLOR at 100, 200, 400mg/kg respectively. Group 6 rats were treated with silymarine while group 7 rats were left untreated. The rats were sacrificed and the liver sections were stained with H&E, Masson trichrome, Gordon and Sweets, PAS, Feulgen reaction, anti-vimentin antibody for demonstration of general histoarchitecture, elastic fibre, collagen fibre; glycogen, nuclear DNA and filamentous cytoskeleton respectively. Groups 2, 3, 7 developed intranuclear vacuolation, plasma coagulation, plamolysis, karyopyknosis, karyorrhexis and karyolysis, hyperchromatism, DNA fading and pleomorphism. Immunohistochemical study revealed near negative immunoreaction for vimentin. These pathological changes were ameliorated in EECLOR-treated groups in a manner comparable to silymarine-treated group. The study concluded that ameliorative effects of EECLOR in KBrO3-induced liver injury could be due to its vimentin stabilization property.