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https://www.readbyqxmd.com/read/28444596/response-surface-design-for-accumulation-of-selenium-by-different-lactic-acid-bacteria
#1
Jingpeng Yang, Yao Li, Li Zhang, Mingtao Fan, Xinyuan Wei
The accumulation of selenium (Se) by Lactobacillus delbrueckii ssp. bulgaricus (Lb) and Streptococcus thermophilus (St) at the different cultivation conditions, including initial pH, inoculum dose (%), and temperature (°C), was investigated in this work. Se enrichment efficiency was optimized using the Design-Expert software for response surface methodology on a basis of single-factor experiment. The antioxidant activities of Se-enriched Lactic acid bacteria (LAB) were also investigated. The qualitative analysis of Se-enriched LAB was performed by FT-IR spectra...
May 2017: 3 Biotech
https://www.readbyqxmd.com/read/28443604/edge-functionalization-of-armchair-graphene-nanoribbons-with-pentagonal-hexagonal-edge-structures
#2
Junga Ryou, Jinwoo Park, Gunn Kim, Suklyun Hong
Using density functional theory calculations, we have studied the edge-functionalization of armchair graphene nanoribbons (AGNRs) with pentagonal-hexagonal edge structures. While the AGNRs with pentagonal-hexagonal edge structures (labeled (5,6)-AGNRs) are metallic, the edge-functionalized (5,6)-AGNRs with substitutional atoms (i.e., nitrogen, oxygen, sulfur, and selenium) opens a band gap, similarly to the defect-free AGNRs. Furthermore, we find that electronic band structures and charge densities vary, depending on the wave vector: The band structures of edge-functionalized (5,6)-N-AGNRs by substitution resemble those of defect-free (N-1)-AGNR at the Γ point, while those at the X point show the original ones of the defect-free N-AGNR...
April 26, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28443587/role-of-trace-elements-for-oxidative-status-and-quality-of-human-sperm
#3
Galina Nenkova, Lubomir Petrov, Albena Alexandrova
BACKGROUND: Oxidative stress affects negatively the sperm quality. For maintaining the pro/antioxidative balance, some metal ions (e.g. copper, zinc, iron, selenium), which are co-factors of the antioxidant enzymes, are essential. However, iron and copper could act as prooxidants inducing oxidative damage of spermatozoa. AIMS: This study aims to reveal a possible correlation between the concentrations of some metal ions (iron, copper, zinc, and selenium) in human seminal plasma, oxidative stress, assessed by malondialdehyde (MDA) and total glutathione (tGSH) levels, and semen quality, assessed by the parameters count, motility, and morphology...
April 6, 2017: Balkan Medical Journal
https://www.readbyqxmd.com/read/28440794/se-sad-serial-femtosecond-crystallography-datasets-from-selenobiotinyl-streptavidin
#4
Chun Hong Yoon, Hasan DeMirci, Raymond G Sierra, E Han Dao, Radman Ahmadi, Fulya Aksit, Andrew L Aquila, Alexander Batyuk, Halilibrahim Ciftci, Serge Guillet, Matt J Hayes, Brandon Hayes, Thomas J Lane, Meng Liang, Ulf Lundström, Jason E Koglin, Paul Mgbam, Yashas Rao, Theodore Rendahl, Evan Rodriguez, Lindsey Zhang, Soichi Wakatsuki, Sébastien Boutet, James M Holton, Mark S Hunter
We provide a detailed description of selenobiotinyl-streptavidin (Se-B SA) co-crystal datasets recorded using the Coherent X-ray Imaging (CXI) instrument at the Linac Coherent Light Source (LCLS) for selenium single-wavelength anomalous diffraction (Se-SAD) structure determination. Se-B SA was chosen as the model system for its high affinity between biotin and streptavidin where the sulfur atom in the biotin molecule (C10H16N2O3S) is substituted with selenium. The dataset was collected at three different transmissions (100, 50, and 10%) using a serial sample chamber setup which allows for two sample chambers, a front chamber and a back chamber, to operate simultaneously...
April 25, 2017: Scientific Data
https://www.readbyqxmd.com/read/28440710/selenium-nanoparticles-potential-in-cancer-gene-and-drug-delivery
#5
Fiona Maiyo, Moganavelli Singh
In recent decades, colloidal selenium nanoparticles have emerged as exceptional selenium species with reported chemopreventative and therapeutic properties. This has sparked widespread interest in their use as a carrier of therapeutic agents with results displaying synergistic effects of selenium with its therapeutic cargo and improved anticancer activity. Functionalization remains a critical step in selenium nanoparticles' development for application in gene or drug delivery. In this review, we highlight recent developments in the synthesis and functionalization strategies of selenium nanoparticles used in cancer drug and gene delivery systems...
April 25, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28438148/maternal-blood-cadmium-lead-and-arsenic-levels-nutrient-combinations-and-offspring-birthweight
#6
Yiwen Luo, Lauren E McCullough, Jung-Ying Tzeng, Thomas Darrah, Avner Vengosh, Rachel L Maguire, Arnab Maity, Carmen Samuel-Hodge, Susan K Murphy, Michelle A Mendez, Cathrine Hoyo
BACKGROUND: Cadmium (Cd), lead (Pb) and arsenic (As) are common environmental contaminants that have been associated with lower birthweight. Although some essential metals may mitigate exposure, data are inconsistent. This study sought to evaluate the relationship between toxic metals, nutrient combinations and birthweight among 275 mother-child pairs. METHODS: Non-essential metals, Cd, Pb, As, and essential metals, iron (Fe), zinc (Zn), selenium (Se), copper (Cu), calcium (Ca), magnesium (Mg), and manganese (Mn) were measured in maternal whole blood obtained during the first trimester using inductively coupled plasma mass spectrometry...
April 24, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28437656/a-gene-environment-interaction-analysis-of-plasma-selenium-with-prevalent-and-incident-diabetes-the-hortega-study
#7
Inmaculada Galan-Chilet, Maria Grau-Perez, Griselda De Marco, Eliseo Guallar, Juan Carlos Martin-Escudero, Alejandro Dominguez-Lucas, Isabel Gonzalez-Manzano, Raul Lopez-Izquierdo, Laisa Socorro Briongos-Figuero, Josep Redon, Felipe Javier Chaves, Maria Tellez-Plaza
BACKGROUND: Selenium and single-nucleotide-polymorphisms in selenoprotein genes have been associated to diabetes. However, the interaction of selenium with genetic variation in diabetes and oxidative stress-related genes has not been evaluated as a potential determinant of diabetes risk. METHODS: We evaluated the cross-sectional and prospective associations of plasma selenium concentrations with type 2 diabetes, and the interaction of selenium concentrations with genetic variation in candidate polymorphisms, in a representative sample of 1452 men and women aged 18-85 years from Spain...
April 14, 2017: Redox Biology
https://www.readbyqxmd.com/read/28436684/serenoa-repens-for-lower-urinary-tract-symptoms-benign-prostatic-hyperplasia-current-evidence-and-its-clinical-implications-in-naturopathic-medicine
#8
Soo Liang Ooi, Sok Cheon Pak
OBJECTIVES: Benign prostatic hyperplasia (BPH) commonly affects men above 40 years old. The progression of BPH is often accompanied with lower urinary tract symptoms (LUTS) that can significantly affect the quality of life of the patients. Serenoa repens (saw palmetto) is a popular herbal remedy indicated for LUTS/BPH. We reviewed the current research on the efficacy of S. repens on LUTS/BPH as a monotherapy as well as combination therapies. DESIGN: Non-systematic searches were performed in PubMed for human studies and systematic reviews on the topic...
April 24, 2017: Journal of Alternative and Complementary Medicine: Research on Paradigm, Practice, and Policy
https://www.readbyqxmd.com/read/28436198/effects-of-selenium-on-apoptosis-and-abnormal-amino-acid-metabolism-induced-by-excess-fatty-acid-in-isolated-rat-hepatocytes
#9
Zhigang Zhang, Siyu Li, Huijie Jiang, Biying Liu, Zhanjun Lv, Changming Guo, Haili Zhang
SCOPE: Increased serum free fatty acid (FFA) occurs in subjects with non-alcoholic fatty liver disease (NAFLD) and also triggers oxidative stress, apoptosis, and insulin resistance. Selenium (Se) is an antioxidant agent. However, the effect of Se on NAFLD or diabetes is still unclear. We investigated the effect of Se on apoptosis and abnormal amino acid metabolism initiated by excess FFA in isolated rat hepatocytes. METHODS AND RESULTS: Primary hepatocytes from rats were isolated and exposed to excessive FFA (0...
April 24, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28435634/treatment-of-restless-legs-syndrome-willis-ekbom-disease-with-selenium
#10
Jan Ulfberg, Romana Stehlik, Ulrike Mitchell
No abstract text is available yet for this article.
October 7, 2016: Iranian Journal of Neurology
https://www.readbyqxmd.com/read/28435430/influence-of-daily-oral-prophylactic-selenium-treatment-on-the-dibutyltin-dichloride-dbtc-induced-pancreatitis-in-rats
#11
J Merkord, N Görl, M Lemke, A Berg, H Weber, R Ramer, G Hennighausen
Dibutyltin dichloride (DBTC) is an organotin compound used as model for acute and chronic pancreatitis. Oxidative stress is one of the mechanisms of propagation of acinar cell injury in acute pancreatitis. Selenium is an essential cofactor in the antioxidant glutathione peroxidase pathway. Selenium levels are described to be subnormal in patients with acute and chronic pancreatitis. The aim of our studies was to determine the prophylactic effect of Na-selenite [5 mg kg(-1) body weight (b.w.) per os (p.o.) 7 days] on the pathogenesis and course of DBTC- induced pancreatitis...
2017: EXCLI journal
https://www.readbyqxmd.com/read/28432892/arsenic-chromium-molybdenum-and-selenium-geochemical-fractions-and-potential-mobilization-in-riverine-soil-profiles-originating-from-germany-and-egypt
#12
Sabry M Shaheen, Eilhann E Kwon, Jayanta K Biswas, Filip M G Tack, Yong Sik Ok, Jörg Rinklebe
The fractionation and potential mobilization of As, Cr, Mo, and Se in four floodplain soil profiles collected along the Nile (Egypt) and Wupper (Germany) Rivers were assessed using the BCR sequential extraction procedure. The concentrations of total and the geochemical fractions (acid soluble (F1), reducible (F2), oxidizable (F3), and residual (F4) fraction) of the elements were determined. The Wupper soils had the highest total concentrations (mg kg(-1)) of As (378) and Cr (2,797) while the Nile soils contained the highest total Mo (12) and Se (42)...
April 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28430124/association-between-serum-selenium-concentrations-and-levels-of-proinflammatory-and-profibrotic-cytokines-interleukin-6-and-growth-differentiation-factor-15-in-patients-with-alcoholic-liver-cirrhosis
#13
Andrzej Prystupa, Paweł Kiciński, Dorota Luchowska-Kocot, Anna Błażewicz, Jarosław Niedziałek, Grzegorz Mizerski, Mariusz Jojczuk, Andrzej Ochal, Jarosław J Sak, Wojciech Załuska
According to some authors, serum selenium levels are strongly associated with the severity of liver diseases, including liver cirrhosis. The aim of this study was to determine the relationship between the concentration of selenium and pro-inflammatory and profibrotic cytokines-interleukin-6 (IL-6) and growth differentiation factor 15 (GDF-15) in patients with alcoholic liver cirrhosis. The parameters studied were determined in the serum of 99 patients with alcoholic liver cirrhosis divided based on the severity of disease according to the Child-Turcotte-Pugh criteria...
April 21, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28429811/synthesis-and-structural-characterisation-of-the-aggregates-of-benzo-1-2-chalcogenazole-2-oxides
#14
Peter C Ho, Jamal Rafique, Jiwon Lee, Lucia M Lee, Hilary A Jenkins, James F Britten, Antonio L Braga, Ignacio Vargas-Baca
Iodine oxidation of bis[2-(hydroxyiminomethyl)phenyl] dichalcogenides yields benzo-1,2-chalcogenazole 2-oxides. Annulated derivatives of iso-tellurazole N-oxides spontaneously aggregate into cyclic tetra- and hexamers through TeO chalcogen bonding; the structures of the co-crystals with benzene and CH2Cl2 illustrate the ability of these macrocycles to interact with small guest molecules. The selenium congener crystallizes forming a supramolecular polymer. VT NMR indicates that both compounds aggregate in solution but only at low temperature in the selenium case...
April 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28429286/effects-of-selenium-supplementation-on-the-diabetic-condition-depend-on-the-baseline-selenium-status-in-kkay-mice
#15
Novian Febiyanto, Chiho Yamazaki, Satomi Kameo, Dian K Sari, Irma M Puspitasari, Deni K Sunjaya, Dewi M D Herawati, Gaga I Nugraha, Toshio Fukuda, Hiroshi Koyama
Oxidative stress in obesity leads to insulin resistance in type 2 diabetes. Some selenoproteins possess antioxidant properties, suggesting that selenium (Se) may protect against type 2 diabetes; however, evidence from epidemiological studies is contradictory. We hypothesized that Se status before supplementation (baseline) contributes to the supplementation outcome. This study aimed to clarify the influence of baseline Se status on the effect of Se supplementation on the diabetic condition. Six-week-old KKAy mice were fed a diet without supplemental Se or with 0...
April 20, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28427058/dietary-selenium-or-zinc-supplementation-restores-brain-lipid-composition-and-membrane-fluidity-in-protein-undernourished-rats
#16
Olusegun L Adebayo, Bamidele A Salau, Rajat Sandhir, Gbenga A Adenuga
Studies have shown that protein undernutrition (PU) modifies the membrane lipid composition in the intestine and liver, as well as in plasma and other areas. However, there is limited information on the effect of PU on synaptosomal membrane lipid composition and fluidity and the protective role of selenium (Se) and zinc (Zn), which is a major focus of the present study. For 10 weeks, rats were fed diets containing 16% casein, which constituted the adequate protein diet, or 5% casein, representing the PU diet...
April 21, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28426210/tellurium-distribution-and-speciation-in-contaminated-soils-from-abandoned-mine-tailings-comparison-with-selenium
#17
Hai-Bo Qin, Yasuo Takeichi, Hiroaki Nitani, Yasuko Terada, Yoshio Takahashi
The distribution and chemical species of tellurium (Te) in contaminated soil were determined by a combination of micro focused X-ray fluorescence (μ-XRF), X-ray diffraction (μ-XRD), and X-ray absorption fine structure (μ-XAFS) techniques. Results showed that Te was present as a mixture of Te(VI) and Te(IV) species, while selenium (Se) was predominantly present in the form of Se(IV) in the soil contaminated by abandoned mine tailings. In the contaminated soil, Fe(III) hydroxides were the host phases for Se(IV), Te(IV), and Te(VI), but Te(IV) could be also retained by illite...
April 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28425630/earth-abundant-chalcogenide-photovoltaic-devices-with-over-5-efficiency-based-on-a-cu2-basn-s-se-4-absorber
#18
Donghyeop Shin, Tong Zhu, Xuan Huang, Oki Gunawan, Volker Blum, David B Mitzi
In recent years, Cu2 ZnSn(S,Se)4 (CZTSSe) materials have enabled important progress in associated thin-film photovoltaic (PV) technology, while avoiding scarce and/or toxic metals; however, cationic disorder and associated band tailing fundamentally limit device performance. Cu2 BaSnS4 (CBTS) has recently been proposed as a prospective alternative large bandgap (~2 eV), environmentally friendly PV material, with ~2% power conversion efficiency (PCE) already demonstrated in corresponding devices. In this study, a two-step process (i...
April 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28425457/strong-reduction-of-thermal-conductivity-and-enhanced-thermoelectric-properties-in-cosbs1-xsex-paracostibite
#19
Radoslaw Chmielowski, Sandip Bhattacharya, Stéphane Jacob, Daniel Péré, Alain Jacob, Kenzo Moriya, Bruno Delatouche, Pascal Roussel, Georg Madsen, Gilles Dennler
In order to reduce the thermal conductivity of CoSbS, a newly developed thermoelectric semiconductor, we have aimed at intentionally induce atomic disorder in its structure. This endeavor was guided by Density Functional Theory(DFT) calculations which indicated that substituting sulfur with selenium might be easily achievable experimentally because of the low formation energy of this point defect. Thereby, CoSbS1-xSex compounds having 0 ≤ x ≤ 1 have been synthesized by solid state reaction. Besides the expected semiconducting paracostibite phase, we have observed the appearance of a semimetallic costibite phase, never reported experimentally before...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28424960/selenium-for-the-mitigation-of-toxicity-induced-by-lead-in-chicken-testes-through-regulating-mrna-expressions-of-hsps-and-selenoproteins
#20
He Huang, Yan Wang, Yang An, Yaguang Tian, Shu Li, Xiaohua Teng
Lead (Pb) is a toxic element and environmental pollutant. Pb toxicity and antagonistic effect of selenium (Se) on Pb have been deeply studied in mammals. The testis is one of the target organs of Pb in birds. The aim of this study was to investigate the mitigating effect of Se on Pb toxicity in chicken testes by determining messenger RNA (mRNA) expressions of 5 heat shock proteins (HSPs) and 25 selenoproteins. Sixty male chickens (7-day-old) were randomly divided into the control group, the Se group, the Pb group, and the Pb + Se group, and were fed for 90 days...
April 20, 2017: Environmental Science and Pollution Research International
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