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https://www.readbyqxmd.com/read/29356322/synthesis-and-characterization-of-biogenic-selenium-nanoparticles-with-antimicrobial-properties-made-by-staphylococcus-aureus-methicillin-resistant-staphylococcus-aureus-mrsa-escherichia-coli-and-pseudomonas-aeruginosa
#1
David Medina Cruz, Gujie Mi, Thomas J Webster
Antimicrobial resistance is a global concern that affects more than 2 million people each year. Therefore, new approaches to kill bacteria are needed. One of the most promising methodologies may come from metallic nanoparticles, since bacteria may not develop a resistance to these nanostructures as they do for antibiotics. While metallic nanoparticle synthesis methods have been well studied, they are often accompanied by significant drawbacks such as cost, extreme processing conditions and toxic waste production since they use harsh chemicals such as corrosive agents (hydrazine) or strong acids (hydrochloride acid)...
January 22, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29355311/unexpected-behavior-of-np-in-oxo-selenate-oxo-selenite-systems
#2
Eike M Langer, Olaf Walter, Jean-Yves Colle, Dirk Bosbach, Evgeny V Alekseev
A study of neptunium (Np) chemistry in the complex oxo-selenium system has been performed. Hereby, two sets of precipitation experiments were conducted, investigating the influence of the initial oxidation state of selenium using SeIVO2 and H2SeVIO4 with NpV in alkali nitrate solution, keeping the ratio of Np/Se constant. Surprising results were observed. Five novel neptunium and selenium bearing compounds have been obtained by slow evaporation from aqueous solution. The novel NpIV phase K4-x[Np(SeO3)4-x(HSeO3)x]·(H2O)1...
January 22, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29354481/disorders-of-metal-metabolism
#3
REVIEW
Carlos R Ferreira, William A Gahl
Trace elements are chemical elements needed in minute amounts for normal physiology. Some of the physiologically relevant trace elements include iodine, copper, iron, manganese, zinc, selenium, cobalt and molybdenum. Of these, some are metals, and in particular, transition metals. The different electron shells of an atom carry different energy levels, with those closest to the nucleus being lowest in energy. The number of electrons in the outermost shell determines the reactivity of such an atom. The electron shells are divided in sub-shells, and in particular the third shell has s, p and d sub-shells...
December 18, 2017: Translational Science of Rare Diseases
https://www.readbyqxmd.com/read/29354377/protective-role-of-selenium-against-chromium-stress-involving-metabolites-and-essential-elements-in-brassica-juncea-l-seedlings
#4
Neha Handa, Sukhmeen Kaur Kohli, Ashwani Kumar Thukral, Renu Bhardwaj, Mohammed N Alyemeni, Leonard Wijaya, Parvaiz Ahmad
The present study aimed at the potential role of selenium in providing protection to plants subjected to chromium toxicity. The study was carried out on 15-day-old seedlings of Brassica juncea raised in the solutions of Cr (300 µM) and Se (2, 4 and 6 µM), both alone and in combinations under controlled laboratory environment. The effects were studied on growth, plant metabolites (involved in osmotic homeostasis and stress protection), and essential elements. The results showed that the exposure of B. juncea seedlings to 300 µM Cr led to an increase in the contents of total sugars, reducing sugars, non-reducing sugars, total phenols and flavonoids...
January 2018: 3 Biotech
https://www.readbyqxmd.com/read/29352947/novel-organic-inorganic-hybrid-flower-like-structure-of-selenium-nanoparticles-stabilized-by-pullulan-derivatives
#5
Punnida Nonsuwan, Songchan Puthong, Tanapat Palaga, Nongnuj Muangsin
We proudly present the first organic/inorganic hybrid pullulan/SeNPs hybrid microflower material obtained using a simple and bio-inspired strategy. The chemical structures of pullulan, folic acid decorated cationic pullulan (FA-CP) were designed for stabilizing selenium nanoparticles (SeNPs). SeNPs stabilized by FA-CP hybrid microflowers were observed after the addition of a cysteine hydrochloride solution into the solution mixture of Na2SeO3 and FA-CP. We suggested that the concentrations of cysteine and FA-CP were the key factors for the formation of flower-like structure...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29351143/nutrition-in-the-icu-new-trends-versus-old-fashioned-standard-enteral-feeding
#6
Kristine W A C Koekkoek, Arthur R H van Zanten
PURPOSE OF REVIEW: The narrative review aims to summarize the relevant studies from the last 2 years and provide contextual information to understand findings. RECENT FINDINGS: Recent ICU studies have provided insight in the pathophysiology and time course of catabolism, anabolic resistance, and metabolic and endocrine derangements interacting with the provision of calories and proteins.Early provision of high protein intake and caloric overfeeding may confer harm...
January 18, 2018: Current Opinion in Anaesthesiology
https://www.readbyqxmd.com/read/29350750/the-hepatoprotective-effect-of-selenium-enriched-yeast-and-gum-arabic-combination-on-carbon-tetrachloride-induced-chronic-liver-injury-in-rats
#7
Mohammed Hamid, Yassin Abdulrahim, Dandan Liu, Gang Qian, Alamzeb Khan, Kehe Huang
The antioxidant and anti-inflammatory effects of selenium-enriched yeast (SY) and Gum Arabic (GA) have been reported. This study aimed to determine the hepatoprotective effect of SY and GA combination on carbon tetrachloride (CCl4 )-induced chronic liver injury in rats and to explore their synergistic mechanisms of action. Forty adult male Wistar rats randomly allotted to 5 groups: (A) worked as control, (B) was administered CCl4 , (C-E) were fed daily by GA, SY, and GA+SY respectively after mixing with basal diet, following CCl4 -intoxication...
January 19, 2018: Journal of Food Science
https://www.readbyqxmd.com/read/29350490/chronic-exposure-to-high-doses-of-selenium-in-the-first-trimester-of-pregnancy-case-report-and-brief-literature-review
#8
Luisa D'Oria, Massimo Apicella, Carmen De Luca, Angelo Licameli, Caterina Neri, Marcella Pellegrino, Daniela Simeone, Marco De Santis
BACKGROUND: Obstetricians usually prescribe supplements during pregnancy without actual indication. The use of selenium during pregnancy has increased, due to its function in several antioxidant mechanisms. CASE: A pregnant woman received 200,000 micrograms (μg) per day of a selenium galenic formulation, since gestational week (g.w.) 7 to 12, due to a prescription error. The patient experienced nausea, vomiting, hand and foot paresthesia, followed by fatigue, loss of fingernails and hair...
January 19, 2018: Birth Defects Research
https://www.readbyqxmd.com/read/29350469/in-vitro-to-in-vivo-benchmark-dose-comparisons-to-inform-risk-assessment-of-quantum-dot-nanomaterials
#9
REVIEW
Brittany A Weldon, William C Griffith, Tomomi Workman, David K Scoville, Terrance J Kavanagh, Elaine M Faustman
Engineered nanomaterials are currently under review for their potential toxicity; however, their use in consumer/commercial products has continued to outpace risk assessments. In vitro methods may be utilized as tools to improve the efficiency of risk assessment approaches. We propose a framework to compare relationships between previously published in vitro and in vivo toxicity assessments of cadmium-selenium containing quantum dots (QDs) using benchmark dose (BMD) and dosimetric assessment methods. Although data were limited this approach was useful for identifying sensitive assays and strains...
January 19, 2018: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/29348054/evaluation-of-sulfane-sulfur-bioeffects-via-a-mitochondria-targeting-selenium-containing-near-infrared-fluorescent-probe
#10
Min Gao, Rui Wang, Fabiao Yu, Lingxin Chen
As a crucial member in antioxidant regulatory systems, sulfane sulfur plays essential roles in cytoprotective mechanisms by directly eliminating ROS and altering ROS-mediated redox signaling. Despite the rising interests in sulfane sulfur, there only a few bio-compatible methods are available for its direct detection. Moreover, most of the existing methods cannot meet the requirements of real-time detection due to the reactive and labile chemical properties of sulfane sulfur. Therefore, we strive to clarify the mutual relationship between mitochondria sulfane sulfur and ROS under hypoxia stress...
January 11, 2018: Biomaterials
https://www.readbyqxmd.com/read/29347082/definite-existence-of-subphases-with-eight-and-ten-layer-unit-cells-as-studied-by-complementary-methods-electric-field-induced-birefringence-and-microbeam-resonant-x-ray-scattering
#11
Zhengyu Feng, A D L Chandani Perera, Atsuo Fukuda, Jagdish K Vij, Ken Ishikawa, Atsuo Iida, Yoichi Takanishi
A mixture of two selenium-containing compounds, 80 wt. % AS657 and 20 wt. % AS620, are studied with two complementary methods, electric-field-induced birefringence (EFIB) and microbeam resonant x-ray scattering (μRXS). The mixture shows the typical phase sequence of Sm-C_{A}^{*}-1/3-1/2-Sm-C^{*}-Sm-C_{α}^{*}-Sm-A, where 1/3 and 1/2 are two prototypal ferrielectric and antiferroelectric subphases with three- and four-layer unit cells, respectively. Here we designate the subphase as its q_{T} number defined by the ratio of [F]/([F]+[A]), where [F] and [A] are the numbers of synclinic ferroelectric and anticlinic antiferroelectric orderings in the unit cell, respectively...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29345703/controllable-colloidal-synthesis-of-anisotropic-tin-dichalcogenide-nanocrystals-for-thin-film-thermoelectrics
#12
Deqiang Yin, Yang Liu, Chaochao Dun, David L Carroll, Mark T Swihart
Tin chalcogenides have shown promise in applications including energy storage, optoelectronics, photovoltaics, and thermoelectrics. Here, we present a colloidal synthesis strategy to produce tin dichalcogenide nanocrystals (NCs) with controllable stoichiometry, vacancies, shape, and crystal structure. Compared with previously reported methods, we use less expensive precursors, such as tin(iv) chloride and sulfur or selenium powder, to produce tin(iv) chalcogenide NCs. SnS2 and SnSe2 NCs with novel NC morphologies including SnS2 nanoflowers/nanoflakes, SnSe2 nanosheets with circular and hexagonal shapes, as well as mixtures of nanospheres and nanoflakes were prepared by varying the solvents and anion precursors...
January 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29343643/pyridoxal-5-phosphate-as-an-oxygenase-cofactor-discovery-of-a-carboxamide-forming-%C3%AE-amino-acid-monooxygenase-decarboxylase
#13
Ying Huang, Xiaodong Liu, Zheng Cui, Daniel Wiegmann, Giuliana Niro, Christian Ducho, Yuan Song, Zhaoyong Yang, Steven G Van Lanen
Capuramycins are antimycobacterial antibiotics that consist of a modified nucleoside named uridine-5'-carboxamide (CarU). Previous biochemical studies have revealed that CarU is derived from UMP, which is first converted to uridine-5'-aldehyde in a reaction catalyzed by the dioxygenase CapA and subsequently to 5'-C-glycyluridine (GlyU), an unusual β-hydroxy-α-amino acid, in a reaction catalyzed by the pyridoxal-5'-phosphate (PLP)-dependent transaldolase CapH. The remaining steps that are necessary to furnish CarU include decarboxylation, O atom insertion, and oxidation...
January 17, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29340457/diet-quality-of-patients-with-chronic-chagas-disease-in-a-tertiary-hospital-a-case-control-study
#14
Mariana Pereira de Castilhos, Grazielle Vilas Bôas Huguenin, Paulo Rogério Melo Rodrigues, Emília Matos do Nascimento, Basílio de Bragança Pereira, Roberto Coury Pedrosa
INTRODUCTION: Nutritional status has been implicated in the modulation of the immune response, possibly augmenting the pathogenesis of Chagas disease (Cd). We evaluated diet quality and nutritional status in adults and elderly patients with chronic Cd in a tertiary hospital. METHODS: A case-control study of Cd patients was conducted, paired for gender, age, and co-morbidities with non-Cd patients. Anthropometric measurements and food frequency questionnaire was used, and diet quality was assessed by the Brazilian Healthy Eating Index-Revised (BHEI-R)...
November 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/29340029/selenium-suppresses-inflammation-by-inducing-microrna-146a-in-staphylococcus-aureus-infected-mouse-mastitis-model
#15
Weijing Sun, Qi Wang, Yingfang Guo, Yifan Zhao, Xinying Wang, Zhenbiao Zhang, Ganzhen Deng, Mengyao Guo
We studied the effects of selenium (Se) on the inflammatory response in Staphylococcus aureus (S. aureus)-infected mastitis-model mice and mammary epithelial cells. In infected mice, Se elicited a dose-dependent decrease in mammary gland pathology that included inflammatory cell infiltration, disorganized acinar structure and mammary cell necrosis. Se decreased inflammation by increasing miR-146a and decreasing TLR2/6 as well as NF-κB and MAPK signaling pathways in mammary tissue from infected mice and mammary epithelial cells...
December 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29338182/-infinite-sensitivity-of-black-silicon-ammonia-sensor-achieved-by-optical-and-electric-dual-drives
#16
Xiao-Long Liu, Suwan Zhu, Hai-Bin Sun, Yue Hu, Sheng-Xiang Ma, Xi-Jing Ning, Li Zhao, Jun Zhuang
The microstructured and hyperdoped silicon as a superior photoelectric and photovoltaic material is firstly studied as a gas-sensing material. The material is prepared by femtosecond-laser irradiation on Selenium-coated silicon and then fabricated as a conductive gas sensor targeting for ammonia. At room temperature, the sensitivity, response time, repeatability, distinguishability, selectivity, and natural aging effect of the sensor have been systematically studied. Results show that such black silicon has good potential for application as an ammonia-sensing material...
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29338053/selenium-regulation-of-selenoprotein-enzyme-activity-and-transcripts-in-a-pilot-study-with-founder-strains-from-the-collaborative-cross
#17
Roger A Sunde
Rodents and humans have 24-25 selenoproteins, and these proteins contain the 21st amino acid, selenocysteine, incorporated co-translationally into the peptide backbone in a series of reactions dependent on at least 6 unique gene products. In selenium (Se) deficiency, there is differential regulation of selenoprotein expression, whereby levels of some selenoproteins and their transcripts decrease dramatically in Se deficiency, but other selenoprotein transcripts are spared this decrease; the underlying mechanism, however, is not fully understood...
2018: PloS One
https://www.readbyqxmd.com/read/29335787/synthesis-of-water-soluble-antimony-sulfide-quantum-dots-and-their-photoelectric-properties
#18
Jiang Zhu, Xuelian Yan, Jiang Cheng
Antimony sulfide (Sb2S3) has been applied in photoelectric devices for a long time. However, there was lack of information about Sb2S3 quantum dots (QDs) because of the synthesis difficulties. To fill this vacancy, water-soluble Sb2S3 QDs were prepared by hot injection using hexadecyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) mixture as anionic-cationic surfactant, alkanol amide (DEA) as stabilizer, and ethylenediaminetetraacetic acid (EDTA) as dispersant. Photoelectric properties including absorbing and emission were characterized by UV-Vis-IR spectrophotometer and photoluminescence (PL) spectroscopic technique...
January 15, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29334744/-selenium-treatment-in-thyreopathies
#19
Štefan Sotak
Selenium (latin Selenium) is a micronutrient embedded in several proteins. In adults, the thyroid is the organ with the highest amount of selenium per gram of tissue. Selenium levels in the body depend on the characteristics of the population and its diet and geographic area. In the thyroid, selenium is required for the antioxidant function and for the metabolism of thyroid hormones. The literature suggests that selenium supplementation of patients with Hashimotos thyroiditis is associated with a reduction in antithyroperoxidase antibody levels...
2018: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/29334718/-diet-and-nutrition-interventions-prevent-gestational-diabetes-mellitus
#20
Z Y Yang
Gestational diabetes mellitus (GDM) is one of the most common complications during pregnancy, with rising trend over the years. Dietary nutrient intake (protein, fat and fatty acids, carbohydrate, vitamin D, vitamin E, iron, zinc, selenium and inositol et al.), dietary pattern and probiotics may be related to GDM occurrence. Dietary factors are modifiable factors for preventing GDM. The study reviewed the roles of these dietary factors in preventing GDM. Results showed that plant-based dietary pattern may lower the risk of GDM and dietary pattern characterized with high animal protein, high fat and low carbohydrate may increase the risk of GDM...
January 6, 2018: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
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