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Hydrogen sulfide

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https://www.readbyqxmd.com/read/29145133/simultaneous-treatment-of-dimethyl-disulfide-and-hydrogen-sulfide-in-an-alkaline-biotrickling-filter
#1
Luis Arellano-García, Sylvie Le Borgne, Sergio Revah
Foul odors comprise generally a complex mixture of molecules, where reduced sulfur compounds play a key role due to their toxicity and low odor threshold. Previous reports on treating mixtures of sulfur compounds in single biofilters showed that hydrogen sulfide (H2S) interferes with the removal and degradation of other sulfur compounds. In this study, hydrogen sulfide (H2S) and dimethyl disulfide (DMDS) were fed to an alkaline biotrickling filter (ABTF) at pH 10, to evaluate the simultaneous removal of inorganic and organic sulfur compounds in a single, basic-pH system...
October 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/29141754/effectiveness-of-the-hydrogen-sulfide-test-as-a-water-quality-indicator-for-diarrhea-risk-in-rural-bangladesh
#2
Mahfuza Islam, Ayse Ercumen, Abu Mohd Naser, Leanne Unicomb, Mahbubur Rahman, Benjamin F Arnold, John M Colford, Stephen P Luby
Microbiological water quality is usually assessed by the identification of Escherichia coli (E. coli), a fecal indicator. The hydrogen sulfide (H2S) test is an inexpensive, easy-to-use, and portable alternative field-based water quality test. Our study evaluated the H2S test's effectiveness as a water quality indicator for diarrhea risk. Field workers collected stored drinking water samples for H2S analysis and detection of E. coli by membrane filtration and measured caregiver-reported diarrhea among children < 5 years in the same households 1 month later...
October 16, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29141438/synthesis-and-stability-of-hydrogen-selenide-compounds-at-high-pressure
#3
Edward J Pace, Jack Binns, Miriam Peña Alvarez, Philip Dalladay-Simpson, Eugene Gregoryanz, Ross T Howie
The observation of high-temperature superconductivity in hydride sulfide (H2S) at high pressures has generated considerable interest in compressed hydrogen-rich compounds. High-pressure hydrogen selenide (H2Se) has also been predicted to be superconducting at high temperatures; however, its behaviour and stability upon compression remains unknown. In this study, we synthesize H2Se in situ from elemental Se and molecular H2 at pressures of 0.4 GPa and temperatures of 473 K. On compression at 300 K, we observe the high-pressure solid phase sequence (I-I'-IV) of H2Se through Raman spectroscopy and x-ray diffraction measurements, before dissociation into its constituent elements...
November 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29141107/metal-transformation-as-a-strategy-for-bacterial-detoxification-of-heavy-metals
#4
Ashraf M M Essa, Mohamed A Al Abboud, Sayeed I Khatib
Microorganisms can modify the chemical and physical characters of metals leading to an alteration in their speciation, mobility, and toxicity. Aqueous heavy metals solutions (Hg, Cd, Pb, Ag, Cu, and Zn) were treated with the volatile metabolic products (VMPs) of Escherichia coli Z3 for 24 h using aerobic bioreactor. The effect of the metals treated with VMPs in comparison to the untreated metals on the growth of E. coli S1 and Staphylococcus aureus S2 (local isolates) was examined. Moreover, the toxic properties of the treated and untreated metals were monitored using minimum inhibitory concentration assay...
November 15, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/29140644/evaluation-of-low-cost-hydrogen-sulfide-monitors-for-use-in-livestock-production
#5
Jessica M Beswick-Honn, Thomas M Peters, T Renée Anthony
Direct-reading gas monitors warn workers of the risk of potentially fatal hydrogen sulfide (H2S) exposures that may arise during manure handling. Low-cost, low-maintenance H2S monitors are available from many manufacturers, but differences in their features and performance make selection challenging for farmers. Moreover, little information is available on the practical maintenance and performance of these devices in agricultural environments. The objective of this study was to provide information to agricultural workers to aid in the selection, maintenance, and use of low-cost H2S monitors...
November 20, 2017: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29140643/assessment-of-interventions-to-improve-air-quality-in-a-livestock-building
#6
T Renée Anthony, Anthony Y Yang, Thomas M Peters
This study examined the effectiveness of engineering controls to reduce contaminant concentrations in a swine farrowing room during winter in the U.S. Midwest. Over two winters, changes in air quality were evaluated following installation of a 1700 m3 h-1 (1000 cfm) recirculating ventilation system to provide 5.4 air exchanges per hour. This system incorporated one of two readily available dust control systems, one based on filtration and the other on cyclonic treatment. A second treatment evaluated reductions in carbon dioxide (CO2) associated with replacement of standard, unvented gas-fired heaters with new vented heaters, installed between the two winter test periods...
November 20, 2017: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29140615/operator-exposure-to-hydrogen-sulfide-from-dairy-manure-storages-containing-gypsum-bedding
#7
Eileen E Fabian-Wheeler, Michael L Hile, Dennis J Murphy, Davis E Hill, Robert Meinen, Robin C Brandt, Hershel A Elliott, Daniel Hofstetter
Dairy manure storages containing gypsum-based bedding have been linked anecdotally with injury and death due to presumed dangerous levels of gases released. Recycled gypsum products are used as a cost-effective bedding alternative to improve animal welfare and provide agronomic benefits to manure recycled back to the land. Sulfur contained in gypsum (calcium sulfate) can contribute to hydrogen sulfide (H2S) gas formation under the anaerobic storage conditions typical of dairy manure slurry. Disturbance of stored manure during agitation releases a burst of volatile gases...
January 26, 2017: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29134987/graphene-quantum-dots-based-fluorescence-turn-on-nanoprobe-for-highly-sensitive-and-selective-imaging-of-hydrogen-sulfide-in-living-cells
#8
Nan Li, Aung Than, Jie Chen, Fengna Xi, Jiyang Liu, Peng Chen
Hydrogen sulfide (H2S), being an important gaseous signaling molecule, has been gaining increasing attention for its involvement in a wide range of physiological processes. Herein, we developed a novel fluorescence turn-on nanoprobe for selective and sensitive detection of H2S based on graphene quantum dots (GQDs) conjugated with (2,4-dinitrophenoxy)tyrosine (DNPTYR). Taking advantage of its high fluorescence quantum yield, biocompatibility, photostability, and ease to be uptaken by cells, the GQD-based fluorescence probe was further employed for real-time monitoring of the triggered dynamic change of the intracellular H2S level in live cells...
November 14, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/29133386/restoration-of-rostral-ventrolateral-medulla-cystathionine-%C3%AE-lyase-activity-underlies-moxonidine-evoked-neuroprotection-and-sympathoinhibition-in-diabetic-rats
#9
Mohamed A Fouda, Shaimaa S El-Sayed, Abdel A Abdel-Rahman
We recently demonstrated a fundamental role for cystathionine-γ lyase (CSE)-derived hydrogen sulfide (H2S) in the cardioprotective effect of the centrally acting drug moxonidine in diabetic rats. Whether a downregulated CSE/H2S system in the rostral ventrolateral medulla (RVLM) underlies neuronal oxidative stress and sympathoexcitation in diabetes has not been investigated. Along with addressing this question, we tested the hypothesis that moxonidine prevents the diabetes-evoked neurochemical effects by restoring CSE/H2S function within its major site of action, the RVLM...
November 13, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/29133036/1-2-4-thiadiazolidin-3-5-diones-as-novel-hydrogen-sulfide-donors
#10
Beatrice Severino, Angela Corvino, Ferdinando Fiorino, Paolo Luciano, Francesco Frecentese, Elisa Magli, Irene Saccone, Paola Di Vaio, Valentina Citi, Vincenzo Calderone, Luigi Servillo, Rosario Casale, Giuseppe Cirino, Valentina Vellecco, Mariarosaria Bucci, Elisa Perissutti, Vincenzo Santagada, Giuseppe Caliendo
Hydrogen sulfide (H2S) is an endogenous modulator that plays significant physio-pathological roles in several biological systems. In this research field there is a large interest in developing selective CBS and CSE inhibitors and H2S releasing moieties, that could be either used as therapeutic agents or linked to known drugs. One of the major problem is the limited availability of chemicals that ensure a controlled release of H2S in vitro as well in vivo. Aiming to obtain novel H2S donors, whose release properties could be appropriately modulated, we have synthesized a series of 1,2,4-thiadiazolidine-3,5-diones (THIA 1-10) as innovative donors that could release H2S in controlled manner...
November 10, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29132976/investigations-into-the-carbonic-anhydrase-inhibition-of-cos-releasing-donor-core-motifs
#11
Andrea K Steiger, Yu Zhao, Won Jin Choi, Alder Crammond, McKinna R Tillotson, Michael D Pluth
Carbonyl sulfide (COS) releasing scaffolds are gaining popularity as hydrogen sulfide (H2S) donors through exploitation of the carbonic anhydrase (CA)-mediated hydrolysis of COS to H2S. The majority of compounds in this emerging class of donors undergo triggerable decomposition (often referred to as self-immolation) to release COS, and a handful of different COS-releasing structures have been reported. One benefit of this donation strategy is that numerous caged COS-containing core motifs are possible and are poised for development into self-immolative COS/H2S donors...
November 10, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/29131577/electronic-structure-reconfiguration-towards-pyrite-nis2-via-engineered-heteroatom-defect-boosting-overall-water-splitting
#12
Hengjie Liu, Qun He, Hongliang Jiang, Yunxiang Lin, Youkui Zhang, Muhammad Habib, Shuangming Chen, Li Song
Developing highly active and low-cost heterogeneous catalysts towards overall electrochemical water splitting is extremely desirable but still a challenge. Herein, we report pyrite NiS2 nanosheets doped with vanadium heteroatoms as bifunctional electrode materials for both hydrogen- and oxygen-evolution reaction (HER and OER). Notably, the electronic structure reconfiguration of pyrite NiS2 is observed from typical semiconductive characteristics to metallic characteristics by engineering vanadium (V) displacement defect, which is confirmed by both experimental temperature-dependent resistivity and theoretical density functional theory (DFT) calculations...
November 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/29131466/understanding-the-reactive-adsorption-of-h2s-and-co2-in-sodium-exchanged-zeolites
#13
Evgenii O Fetisov, Mansi S Shah, Christopher Knight, Michael Tsapatsis, Joern Ilja Siepmann
Purifying sour natural gas streams containing hydrogen sulfide and carbon dioxide has been a long-standing environmental and economic challenge. In the presence of cation-exchanged zeolites, these two acid gases can react to form carbonyl sulfide and water (H2S + CO2 <=> H2O + COS), but this reaction is rarely accounted for. In this work, we carry out reactive first-principles Monte Carlo (RxFPMC) simulations for mixtures of H2S and CO2 in all-silica and Na- exchanged forms of zeolite beta to understand the governing principles driving the enhanced conversion...
November 13, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29131297/gut-bacteria-derived-molecules-as-mediators-and-markers-in-cardiovascular-diseases-the-role-of-the-gut-blood-barrier
#14
Marcin Ufnal, Artur Nowiński
Accumulating evidence suggests that gut bacteria-derived compounds enter the bloodstream and affect the circulatory system functions. For example, hydrogen sulfide, a product of gut sulfate-reducing bacteria, was found to exert significant hemodynamic effects. Furthermore, trimethylamine N-oxide, a gut bacteria derivative metabolite of L-carnitine and choline, has recently emerged as a new marker of increased cardiovascular risk. To enter the circulation, gut bacteria metabolites need to pass the gut-blood barrier...
November 13, 2017: Kardiologia Polska
https://www.readbyqxmd.com/read/29130338/colonic-hydrogen-sulfide-produces-portal-hypertension-and-systemic-hypotension-in-rats
#15
Tomasz Huc, Halina Jurkowska, Maria Wróbel, Kinga Jaworska, Maksymilian Onyszkiewicz, Marcin Ufnal
Hydrogen sulfide, a toxic gas, at low concentrations is also a biological mediator in animals. In the colon, hydrogen sulfide is produced by intestinal tissues and gut sulfur bacteria. Gut-derived molecules undergo liver metabolism. Portal hypertension is one of the most common complications contributing to the high mortality in liver cirrhosis. We hypothesized that the colon-derived hydrogen sulfide may affect portal blood pressure. Sprague-Dawley rats were maintained either on tap water (controls) or on water solution of thioacetamide to produce liver cirrhosis (CRH-R)...
January 1, 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29129055/the-role-of-elemental-sulfur-in-forming-latent-precursors-of-h2s-in-wine
#16
Jillian A Jastrzembski, Rachel B Allison, Elle Friedberg, Gavin L Sacks
Hydrogen sulfide (H2S) can increase during abiotic storage of wines, and potential latent sources of H2S are still under investigation. We demonstrate that elemental sulfur (S(0)) residues on grapes can not only produce H2S during fermentation, but also form precursors capable of generating additional H2S after three months bottle storage. H2S could be released from S(0)-derived precursors by addition of a reducing agent (TCEP), but not by addition of strong brine, and the size of the TCEP-releasable pool varied among yeast strain...
November 12, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29128722/photocatalytic-degradation-of-h2s-aqueous-media-using-sulfide-nanostructured-solid-solution-solar-energy-materials-to-produce-hydrogen-fuel
#17
Mohsen Lashgari, Majid Ghanimati
H2S is a corrosive, flammable and noxious gas, which can be neutralized by dissolving in alkaline media and employed as H2-source by utilizing inside semiconductor-assisted/photochemical reactors. Herein, through a facile hydrothermal route, a ternary nanostructured solid-solution of iron, zinc and sulfur was synthesized in the absence and presence of Ag-dopant, and applied as efficient photocatalyst of hydrogen fuel production from H2S media. The effect of pH on the photocatalyst performance was scrutinized and the maximum activity was attained at pH=11, where HS(-) concentration is high...
November 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29128401/h2s-protects-lipopolysaccharide-induced-inflammation-by-blocking-nf%C3%AE%C2%BAb-transactivation-in-endothelial-cells
#18
Caitlyn Bourque, Yanjie Zhang, Ming Fu, Mélanie Racine, Adam Greasley, Yanxi Pei, Lingyun Wu, Rui Wang, Guangdong Yang
Hydrogen sulfide (H2S) is a novel gasotransmitter and acts as a multifunctional regulator in various cellular functions. Past studies have demonstrated a significant role of H2S and its generating enzyme cystathionine gamma-lyase (CSE) in the cardiovascular system. Lipopolysaccharide (LPS), a major pathogenic factor, is known to initiate the inflammatory immune response. The cross talk between LPS-induced inflammation and the CSE/H2S system in vascular cells has not yet been elucidated in detail. Here we showed that LPS decreased CSE mRNA and protein expression in human endothelial cells and blocked H2S production in mouse aorta tissues...
November 8, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29126463/a-cell-surface-specific-two-photon-fluorescent-probe-for-monitoring-intercellular-transmission-of-hydrogen-sulfide
#19
Yu-Jia Fu, Hui-Wen Yao, Xiao-Yan Zhu, Xiao-Feng Guo, Hong Wang
Hydrogen sulfide (H2S) is a new endogenously generated gasotransmitter and has implicated in many physiologies and pathologies closely related to its intracellular and intercellular signaling transduction. Although many fluorescent probes have been exploited to track and quantify H2S in living systems, none of them could be used for monitoring intercellular transmission of H2S. Herein, we developed a cell surface specific H2S probe, 4-azido-6-sulfo-N-hexadecyl-1,8-naphthalimide, sodium salt (ASNHN-N3), trying to investigate the behaviors of extracellular release of H2S...
November 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29124312/anaerobic-benzene-mineralization-by-nitrate-reducing-and-sulfate-reducing-microbial-consortia-enriched-from-the-same-site-comparison-of-community-composition-and-degradation-characteristics
#20
Andreas H Keller, Sabine Kleinsteuber, Carsten Vogt
Benzene mineralization under nitrate-reducing conditions was successfully established in an on-site reactor continuously fed with nitrate and sulfidic, benzene-containing groundwater extracted from a contaminated aquifer. Filling material from the reactor columns was used to set up anoxic enrichment cultures in mineral medium with benzene as electron donor and sole organic carbon source and nitrate as electron acceptor. Benzene degradation characteristics and community composition under nitrate-reducing conditions were monitored and compared to those of a well-investigated benzene-mineralizing consortium enriched from the same column system under sulfate-reducing conditions...
November 9, 2017: Microbial Ecology
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