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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/29140644/evaluation-of-low-cost-hydrogen-sulfide-monitors-for-use-in-livestock-production
#4
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/29140615/operator-exposure-to-hydrogen-sulfide-from-dairy-manure-storages-containing-gypsum-bedding
#5
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
#6
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/29134784/a-general-strategy-for-development-of-near-infrared-fluorescent-probes-for-bioimaging
#7
Ming Xian, Wei Chen, Shi Xu, Jacob J Day, Difei Wang
Near-infrared (NIR) fluorescent dyes with favorable photophysical properties are highly useful for bioimaging, but such dyes are still rare. Here, we describe the development of a unique class of NIR dyes via modifying the rhodol-scaffold with fused tetrahydroquinoxaline rings. These new dyes showed large Stokes shifts (>110 nm). Among them, WR3, WR4, WR5 and WR6 displayed high fluorescence quantum yields and excellent photostability in aqueous solutions. Moreover, their fluorescence properties were tunable by easy modifications on the phenolic hydroxyl group...
November 13, 2017: Angewandte Chemie
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
#8
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
#9
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
#10
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/29131466/understanding-the-reactive-adsorption-of-h2s-and-co2-in-sodium-exchanged-zeolites
#11
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/29129814/zinc-deficiency-promotes-cystitis-related-bladder-pain-by-enhancing-function-and-expression-of-cav3-2-in-mice
#12
Tomoka Ozaki, Junki Matsuoka, Maho Tsubota, Shiori Tomita, Fumiko Sekiguchi, Takeshi Minami, Atsufumi Kawabata
Cav3.2 T-type Ca(2+) channel activity is suppressed by zinc that binds to the extracellular histidine-191 of Cav3.2, and enhanced by H2S that interacts with zinc. Cav3.2 in nociceptors is upregulated in an activity-dependent manner. The enhanced Cav3.2 activity by H2S formed by the upregulated cystathionine-γ-lyase (CSE) is involved in the cyclophosphamide (CPA)-induced cystitis-related bladder pain in mice. We thus asked if zinc deficiency affects the cystitis-related bladder pain in mice by altering Cav3...
November 9, 2017: Toxicology
https://www.readbyqxmd.com/read/29129055/the-role-of-elemental-sulfur-in-forming-latent-precursors-of-h2s-in-wine
#13
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
#14
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
#15
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
#16
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/29123977/sodium-hydrosulfide-attenuates-cerebral-ischemia-reperfusion-injury-by-suppressing-overactivated-autophagy-in-rats
#17
Wen-Wu Jiang, Bai-Sheng Huang, Yang Han, Lv-Hong Deng, Li-Xiang Wu
Ischemic stroke is a leading cause of death and disability worldwide, and autophagy may be involved in the pathological process of cerebral ischemia/reperfusion injury. Hydrogen sulfide (H2S) is an endogenous gasotransmitter with protective effects against multiple diseases. Here, we tested the effect of H2S on cerebral ischemia/reperfusion injury in rats. Sodium hydrosulfide (NaHS), an H2S donor, improved neurological function and reduced the size of the infarcts induced by transient middle cerebral artery occlusion (MCAO) followed by reperfusion in rats...
November 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/29116347/methanogenic-and-sulfate-reducing-activities-in-a-hypersaline-microbial-mat-and-associated-microbial-diversity
#18
Santiago Cadena, José Q García-Maldonado, Nguyen E López-Lozano, Francisco J Cervantes
Methanogenesis and sulfate reduction are important microbial processes in hypersaline environments. However, key aspects determining substrate competition between these microbial processes have not been well documented. We evaluated competitive and non-competitive substrates for stimulation of both processes through microcosm experiments of hypersaline microbial mat samples from Guerrero Negro, Baja California Sur, Mexico, and we assessed the effect of these substrates on the microbial community composition...
November 8, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/29115393/neuroprotective-effects-of-hydrogen-sulfide-on-sodium-azide-induced-oxidative-stress-in-pc12-cells
#19
Cheng Gao, Pan Chang, Lijun Yang, Yi Wang, Shaohua Zhu, Haiyan Shan, Mingyang Zhang, Luyang Tao
Alzheimer's disease (AD) is the most common neurodegenerative disorder, responsible for >50% of all dementia cases. Sodium azide (NaN3) inhibits cytochrome oxidase by irreversibly binding to the heme cofactor and selectively reducing the complex IV activity, which is present in post‑mortem AD brains. Previous data demonstrated that hydrogen sulfide (H2S), the third endogenous gaseous mediator, exerted protective effects against neuronal damage. Therefore, it was hypothesized that H2S may be able to scavenge excess reactive oxygen species (ROS), thereby protecting against oxidative stress and cell death...
November 1, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29114021/imaging-of-cellular-oxidoreductase-activity-suggests-mixotrophic-metabolisms-in-thiomargarita-spp
#20
Jake V Bailey, Beverly E Flood, Elizabeth Ricci, Nathalie Delherbe
The largest known bacteria, Thiomargarita spp., have yet to be isolated in pure culture, but their large size allows for individual cells to be monitored in time course experiments or to be individually sorted for omics-based investigations. Here we investigated the metabolism of individual cells of Thiomargarita spp. by using a novel application of a tetrazolium-based dye that measures oxidoreductase activity. When coupled with microscopy, staining of the cells with a tetrazolium-formazan dye allows metabolic responses in Thiomargarita spp...
November 7, 2017: MBio
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