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Hydrogen sulfide

H Abd Elmoneim, F Sharabi, M Mohy El Din, L Louedec, X Norel, A Senbel
AIM: Hydrogen sulfide (H2S) is a newly-introduced gasotransmitter in penile tissues. However, its exact mechanism of action in mediating penile erection is not fully elucidated. The major aim of this study was to examine the role of different K(+) channels in mediating the responses to H2S in the corpus cavernosum. MAIN METHODS: Tension studies using isolated rat corpus cavernosum strips were conducted. Endogenous H2S production was measured using polarographic technique...
September 13, 2017: Life Sciences
Miguel Angel Angel Niño, Eduardo Flores, Carlos Sanchez, Juan M Rojo
The reactivity of an iron monosulfide surface exposed at room temperature to molecular nitrogen and hydrogen sulfide has been investigated using X-ray photoemission spectroscopy (XPS) and thermal desorption spectroscopy (TDS). We have observed adsorption of nitrogen at room temperature that depends on the surface nanostructure and on the electronic state of nitrogen. The subsequent reaction of this adsorbed nitrogen with hydrogen sulfide results in depletion of the nitrogen surface content which can be interpreted in terms of ammonia formation...
September 15, 2017: Journal of Physical Chemistry. B
Shunichi Fukuzumi, Yong-Min Lee, Wonwoo Nam
Seawater is the most abundant resource on our planet and fuel production from seawater has the remarkable merit that it would not compete with growing demands of pure water. This review focuses on the production of fuels from seawater and their direct use in fuel cells. Electrolysis of seawater under appropriate conditions affords hydrogen and dioxygen with 100% Faradaic efficiency without oxidation of chloride ion. Photoelectrocatalytic production of hydrogen from seawater provides promising way to produce hydrogen with low cost and high efficiency...
September 15, 2017: ChemSusChem
Aarón Torres-Martínez, Arlette Hernández-Franyutti, Mari Carmen Uribe, Wilfrido Miguel Contreras-Sánchez
The structure of the ovary and oogenesis of Poecilia mexicana from an active sulfur spring cave is documented. Poecilia mexicana is the only poeciliid adapted to a subterranean environment with high hydrogen sulfide levels and extreme hypoxic conditions. Twenty females were captured throughout one year at Cueva del Azufre, located in the State of Tabasco in Southern Mexico. Ovaries were processed with histological techniques. P. mexicana has a single, ovoid ovary with ovigerous lamella that project to the ovarian lumen...
September 15, 2017: Journal of Morphology
Vanessa Ribeiro Figliuolo, Liliane Martins Dos Santos, Alessandra Abalo, Hayandra Nanini, Angela Santos, Nilda M Brittes, Claudio Bernardazzi, Heitor Siffert Pereira de Souza, Leda Quercia Vieira, Robson Coutinho-Silva, Claudia Mara Lara Melo Coutinho
The intestinal microbiota is critical for mammalian immune system development and homeostasis. Sulfate-reducing bacteria (SRB) are part of the normal gut microbiota, but their increased levels may contribute to colitis development, likely in association with hydrogen sulfide (H2S) production. Here, we investigated the effects of SRB in the gut immune response in germ-free mice, and in experimental colitis. After 7days of colonization with Desulfovibrio indonesiensis or with a human SRB consortium (from patients with colitis), germ-free mice exhibited alterations in the colonic architecture, with increased cell infiltration in the lamina propria...
September 11, 2017: Life Sciences
Sonya Barzgar, Joseph Patrick Hettiaratchi, Lauretta Pearse, Sunil Kumar
This study focussed on evaluating the effect of hydrogen sulfide (H2S) on biological oxidation of waste methane (CH4) gas in compost biofilters, Batch experiments were conducted to determine the dependency of maximum methane oxidation rate (Vmax) on two main factors; pH and moisture content, as well as their interaction effects. The maximum Vmax was observed at a pH of 7.2 with decreasing Vmax values observed with decreasing pH, irrespective of moisture content. Flow-through columns operated at a pH of 4.5 oxidized CH4 at a flux rate of 53g/m(2)/d compared to 146g/m(2)/d in columns operated at neutral pH...
September 1, 2017: Bioresource Technology
Xiaohu Dai, Chongliang Hu, Dong Zhang, Lingling Dai, Nina Duan
A novel strategy for acclimation to ammonia stress was implemented by stimulating a high ammonia-ammonium-pH environment in a high-solid anaerobic digestion (AD) system in this study. Three semi-continuously stirred anaerobic reactors performed well over the whole study period under mesophilic conditions, especially in experimental group (R-2) when accommodated from acclimation period which the maximum total ammonia nitrogen (TAN) and free ammonia nitrogen (FAN) increased to 4921 and 2996mg/L, respectively...
September 4, 2017: Bioresource Technology
Jiajia Wu, Huaiqun Liu, Peng Wang, Dun Zhang, Yan Sun, Ee Li
Sulfate-reducing bacteria (SRB) were found to be capable of tolerating a certain amount of oxygen (O2), but how they affect oxygen reduction reaction (ORR) has not been clear. The present work investigated the impact of SRB on ORR in 3.5 wt% sodium chloride solution with the cyclic voltammetry method. The addition of SRB culture solution hampered both the reduction of O2 to superoxide (O2(·-)) and hydrogen peroxide (H2O2) to water (H2O), and the influence of SRB metabolites was much larger than that of bacterial cells...
September 2017: Indian Journal of Microbiology
Richa Verma, Yumna Akhtar, Somnath Singh
Hydrogen sulfide (H2S) is a colorless gas with a characteristic smell of rotten eggs. Once only thought of as a toxic gas, evidence now shows that H2S plays major roles in pathological and physiological activities. These roles are being utilized to treat diseases and disorders ranging from hypertension, inflammation, edema, cardiovascular issues, chronic pain, cancer, and many more. Challenges facing the use of H2S currently involve achieving the optimum therapeutic concentrations, synthesizing chemically and physiologically stable donors, and developing clinically appropriate delivery systems...
September 11, 2017: Recent Patents on Drug Delivery & Formulation
Gloria N Okpala, Chuan Chen, Tekle Fida, Gerrit Voordouw
Oil fields can experience souring, the reduction of sulfate to sulfide by sulfate-reducing microorganisms. At the Terra Nova oil field near Canada's east coast, with a reservoir temperature of 95°C, souring was indicated by increased hydrogen sulfide in produced waters (PW). Microbial community analysis by 16S rRNA gene sequencing showed the hyperthermophilic sulfate-reducing archaeon Archaeoglobus in Terra Nova PWs. Growth enrichments in sulfate-containing media at 55-70°C with lactate or volatile fatty acids yielded the thermophilic sulfate-reducing bacterium (SRB) Desulfotomaculum...
2017: Frontiers in Microbiology
Jiantong Du, Hongfang Jin, Liu Yang
As the third gasotransmitter, hydrogen sulfide (H2S) plays a crucial role in the physiology and pathophysiology of many systems in the body, such as the nervous, cardiovascular, respiratory, and gastrointestinal systems. The mechanisms for its effects, including inhibiting ischemic injury, reducing oxidative stress damage, regulating apoptosis, and reducing the inflammation reaction in different systems, have not been fully understood. Recently, H2S and its endogenous synthesis pathway were found in the mammalian retina...
2017: Frontiers in Pharmacology
Subbiramaniyan Kubendhiran, Balamurugan Thirumalraj, Shen-Ming Chen, Chelladurai Karuppiah
In this work, we describe a simple approach for the preparation of cobalt sulfide/reduced graphene oxide (CoS/RGO) nanohybrids via single step electrochemical method. The electrocatalytic activity of the CoS/RGO nanohybrids was evaluated towards the detection hydrogen peroxide (H2O2). The physiochemical properties of the prepared composite was characterized by means of field emission scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and X-ray powder diffraction patterns...
August 30, 2017: Journal of Colloid and Interface Science
Yanmei Xin, Xiang Kan, Li-Yong Gan, Zhonghai Zhang
Solar-driven overall water splitting is highly desirable for hydrogen generation with sustainable energy sources, which need efficient, earth-abundant, robust, and bifunctional electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, we propose a heterogeneous bimetallic phosphide/sulfide nanocomposite electrocatalyst of NiFeSP on nickel foam (NiFeSP/NF), which shows superior electrocatalytic activity of low overpotentials of 91 mV at -10 mA cm(-2) for HER and of 240 mV at 50 mA cm(-2) for OER in 1 M KOH solution...
September 14, 2017: ACS Nano
Irini Topalidou, Dana L Miller
Hydrogen sulfide is common in the environment, and is also endogenously produced by animal cells. Although hydrogen sulfide is often toxic, exposure to low levels of hydrogen sulfide improves outcome in a variety of mammalian models of ischemia-reperfusion injury. In Caenorhabditis elegans, the initial transcriptional response to hydrogen sulfide depends on the hif-1 transcription factor, and hif-1 mutant animals die when exposed to hydrogen sulfide. In this study, we use rescue experiments to identify tissues in which hif-1 is required to survive exposure to hydrogen sulfide...
September 9, 2017: G3: Genes—Genomes—Genetics
A M Sashi Papu John, Sourav Kundu, Sathnur Pushpakumar, Maura Fordham, Gregory Weber, Manas Mukhopadhyay, Utpal Sen
The relationship between hydrogen sulfide (H2S), microRNAs (miRs), matrix metalloproteinases (MMPs) and poly-ADP-ribose-polymerase-1 (PARP-1) in diabetic kidney remodeling remains mostly obscured. We aimed at investigating whether alteration of miR-194-dependent MMPs and PARP-1 causes renal fibrosis in diabetes kidney, and whether H2S ameliorates fibrosis. Wild type, diabetic Akita mice as well as mouse glomerular endothelial cells (MGECs) were used as experimental models, and GYY4137 as H2S donor. In diabetic mice, plasma H2S levels were decreased while ROS and expression of its modulator (ROMO1) were increased...
September 7, 2017: Scientific Reports
Josué Arturo Velázquez-Moyado, José Luis Balderas-López, Elizabeth Arlen Pineda-Peña, Brenda Lorena Sánchez-Ortiz, José Carlos Tavares-Carvalho, Andrés Navarrete
(Z,Z')-Diligustilide (DLG) or levistolide A is a dimeric phthalide isolated from Ligusticum porteri (Osha), the roots of which are used in the traditional treatment of many diseases including gastric aches. However, its action has not been completely elucidated. We analyzed the contributions of hydrogen sulfide and S-nitrosothiols to the action of DLG. Animals were pretreated with freshly formed in vitro nitrosothiol using Na2S and sodium nitroprusside to elucidate participation in the action of DLG. We also evaluated the production of H2S in vivo and in real time on the stomach via a specific electrode introduced into the stomachs of anaesthetized animals pretreated with DLG...
September 6, 2017: Inflammopharmacology
Meng Li, Chengfu Xu, Junping Shi, Jiexia Ding, Xingyong Wan, Dahua Chen, Jianguo Gao, Chunxiao Li, Jie Zhang, Yiming Lin, Zhenhua Tu, Xiaoni Kong, Youming Li, Chaohui Yu
OBJECTIVE: Accumulation of free fatty acids (FFAs) in hepatocytes induces lipotoxicity, leading to non-alcoholic fatty liver disease (NAFLD). This study aimed to investigate the underlying mechanisms by which FFA contributes to the pathogenesis of NAFLD via the regulation of 3-mercaptopyruvate sulfurtransferase (MPST), a key enzyme that regulates endogenous hydrogen sulfide (H2S) biosynthesis. DESIGN: Hepatic MPST expression was evaluated in mice and patients with NAFLD...
September 6, 2017: Gut
Eric Singh, M Meyyappan, Hari S Nalwa
Wearable electronics is expected to be one of the most active research areas in the next decade, therefore, nanomaterials possessing high carrier mobility, optical transparency, mechanical robustness and flexibility, light-weight, and environmental stability will be in immense demand. Graphene is one of the nanomaterials that fulfill all these requirements, along with other inherently unique properties and convenience to fabricate into different morphological nanostructures, from atomically thin single layers to nanoribbons...
September 6, 2017: ACS Applied Materials & Interfaces
Yuka Kimura, Shin Koike, Norihiro Shibuya, David Lefer, Yuki Ogasawara, Hideo Kimura
Cysteine-persulfide (Cys-SSH) is a cysteine whose sulfhydryl group is covalently bound to sulfur (sulfane sulfur). Cys-SSH and its glutathione (GSH) counterpart (GSSH) have been recognized as redox regulators, some of which were previously ascribed to cysteine and GSH. However, the production of Cys-SSH and GSSH is not well understood. Here, we show that 3-mercaptopyruvate sulfurtransferase (3MST) produces Cys-SSH and GSSH together with the potential signaling molecules hydrogen per- and tri-sulfide (H2S2 and H2S3)...
September 5, 2017: Scientific Reports
Chun-Shun Li, Ariel M Sarotti, Peng Huang, Uyen T Dang, Julian G Hurdle, Tamara P Kondratyuk, John M Pezzuto, James Turkson, Shugeng Cao
LC-UV/MS-based metabolomic analysis of the Hawaiian endophytic fungus Paraphaeosphaeria neglecta FT462 led to the identification of four unique mercaptolactated γ-pyranol-γ-lactams, paraphaeosphaerides E-H (1-4) together with one γ-lactone (5) and the methyl ester of compound 2 (11). The structures of the new compounds (1-5 and 11) were elucidated through the analysis of HRMS and NMR spectroscopic data. The absolute configuration was determined by chemical reactions with sodium borohydride, hydrogen peroxide, α-methoxy-α-(trifluoromethyl)phenylacetyl chlorides (Mosher reagents), and DP4 + NMR calculations...
September 5, 2017: Scientific Reports
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