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Hydrogen sulphide

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https://www.readbyqxmd.com/read/28822926/human-exposure-to-hydrogen-sulphide-concentrations-near-wastewater-treatment-plants
#1
Ana Flavia Locateli Godoi, Anderson Marlon Grasel, Gabriela Polezer, Andrew Brown, Sanja Potgieter-Vermaak, Débora Camargo Scremim, Carlos I Yamamoto, Ricardo Henrique Moreton Godoi
The hydrogen sulphide (H2S) levels from wastewater treatment plants (WWTPs) in Curitiba, Brazil have been quantified for the first time. H2S generated by anaerobic decomposition of organic matter in WWTPs is a cause for concern because it is an air pollutant, which can cause eye and respiratory irritation, headaches, and nausea. Considering the requirement for WWTPs in all communities, it is necessary to assess the concentrations and effects of gases such as H2S on populations living and/or working near WWTPs...
August 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28821266/endogenous-hydrogen-sulphide-attenuates-nlrp3-inflammasome-mediated-neuroinflammation-by-suppressing-the-p2x7-receptor-after-intracerebral-haemorrhage-in-rats
#2
Hengli Zhao, Pengyu Pan, Yang Yang, Hongfei Ge, Weixiang Chen, Jie Qu, Jiantao Shi, Gaoyu Cui, Xin Liu, Hua Feng, Yujie Chen
BACKGROUND: Emerging studies have demonstrated the important physiological and pathophysiological roles of hydrogen sulphide (H2S) as a gasotransmitter for NOD-like receptor family pyrin domain-containing 3 (NLRP3) inflammasome-associated neuroinflammation in the central nervous system. However, the effects of H2S on neuroinflammation after intracerebral haemorrhage (ICH), especially on the NLRP3 inflammasome, remain unknown. METHODS: We employed a Sprague-Dawley rat of collagenase-induced ICH in the present study...
August 18, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28797144/gypsum-in-animal-slurry-systems-enhances-generation-of-hydrogen-sulphide-and-increases-occupational-exposure-hazard
#3
Brian Crook, Stephen Stagg, Alison Bowry, Gillian Frost
Hydrogen sulphide gas (H2S) produced by sulphate reducing bacteria (SRB) in stored animal slurry is highly toxic and, if emitted into poorly ventilated confined spaces, can build up to concentrations capable of causing asphyxiation. Therefore it is important to understand factors influencing H2S emission from slurry. Powdered gypsum (hydrated calcium sulphate) may be used as animal bedding and, if it enters slurry systems, could be metabolised by SRB and further increase H2S generation. Cattle slurry and cattle bedding collected from farms was used in laboratory-scale experiments sealed in 20litre vessels fitted with mechanical stirrers...
August 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28796243/exogenous-h2s-facilitating-ubiquitin-aggregates-clearance-via-autophagy-attenuates-type-2-diabetes-induced-cardiomyopathy
#4
Jichao Wu, Zhiliang Tian, Yu Sun, Cuicui Lu, Ning Liu, Zhaopeng Gao, Linxue Zhang, Shiyun Dong, Fan Yang, Xin Zhong, Changqing Xu, Fanghao Lu, Weihua Zhang
Diabetic cardiomyopathy (DCM) is a serious complication of diabetes. Hydrogen sulphide (H2S), a newly found gaseous signalling molecule, has an important role in many regulatory functions. The purpose of this study is to investigate the effects of exogenous H2S on autophagy and its possible mechanism in DCM induced by type II diabetes (T2DCM). In this study, we found that sodium hydrosulphide (NaHS) attenuated the augment in left ventricular (LV) mass and increased LV volume, decreased reactive oxygen species (ROS) production and ameliorated H2S production in the hearts of db/db mice...
August 10, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28777815/biochemical-adaptations-of-four-submerged-macrophytes-under-combined-exposure-to-hypoxia-and-hydrogen-sulphide
#5
Mahfuza Parveen, Takashi Asaeda, Md H Rashid
A hydroponic experiment was performed to investigate the stress responses and biochemical adaptations of four submerged macrophytes, Potamogeton crispus, Myriophyllum spicatum, Egeria densa, and Potamogeton oxyphyllus, to the combined exposure of hypoxia and hydrogen sulfide (H2S, provided by NaHS). The investigated plants were subjected to a control, hypoxia, 0.1mM NaHS, 0.5 mM NaHS, 0.1 mM NaHS+hypoxia and 0.5 mM NaHS+hypoxia conditions. All experimental plants grew optimally under control, hypoxic and NaHS conditions in comparison to that grown in the combined exposure of hypoxia and hydrogen sulfide...
2017: PloS One
https://www.readbyqxmd.com/read/28760322/cytochrome-bd-and-gaseous-ligands-in-bacterial-physiology
#6
Elena Forte, Vitaliy B Borisov, João B Vicente, Alessandro Giuffrè
Cytochrome bd is a unique prokaryotic respiratory terminal oxidase that does not belong to the extensively investigated family of haem-copper oxidases (HCOs). The enzyme catalyses the four-electron reduction of O2 to 2H2O, using quinols as physiological reducing substrates. The reaction is electrogenic and cytochrome bd therefore sustains bacterial energy metabolism by contributing to maintain the transmembrane proton motive force required for ATP synthesis. As compared to HCOs, cytochrome bd displays several distinctive features in terms of (i) metal composition (it lacks Cu and harbours a d-type haem in addition to two haems b), (ii) overall three-dimensional structure, that only recently has been solved, and arrangement of the redox cofactors, (iii) lesser energetic efficiency (it is not a proton pump), (iv) higher O2 affinity, (v) higher resistance to inhibitors such as cyanide, nitric oxide (NO) and hydrogen sulphide (H2S) and (vi) ability to efficiently metabolize potentially toxic reactive oxygen and nitrogen species like hydrogen peroxide (H2O2) and peroxynitrite (ONOO(-))...
2017: Advances in Microbial Physiology
https://www.readbyqxmd.com/read/28751723/hydrogen-sulphide-donors-selectively-potentiate-a-green-tea-polyphenol-egcg-induced-apoptosis-of-multiple-myeloma-cells
#7
Jaehoon Bae, Motofumi Kumazoe, Shuya Yamashita, Hirofumi Tachibana
Hydrogen sulphide (H2S) is a colourless gas with the odour of rotten eggs and has recently been recognized as a signal mediator in physiological activities related with the regulation of homeostasis, the vascular system and the inflammatory system. Here we show that H2S donors, including sodium hydrogen sulphide (NaHS), GYY 4137 and diallyltrisulfide (DATS), synergistically enhanced the anti-cancer effect of a green tea polyphenol (-)-epigallocatechin-3-O-gallate (EGCG) against multiple myeloma cells without affecting normal cells...
July 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28727160/the-long-term-effect-of-a-zinc-acetate-and-chlorhexidine-diacetate-containing-mouth-rinse-on-intra-oral-halitosis-a-randomized-clinical-trial
#8
Seida Erovic Ademovski, Carina Mårtensson, G Rutger Persson, Stefan Renvert
AIM: To evaluate the long-term effects of a zinc acetate and chlorhexidine diacetate mouth rinse (Zn/CHX) on intra-oral halitosis. MATERIALS AND METHODS: Forty-six adults with intra-oral halitosis were randomized into a 6-month, double-blind, placebo-controlled clinical study. The presence of intra-oral halitosis was evaluated at baseline, 3, and 6 months after treatment by assessment of organoleptic score (OLS) and by total volatile sulphur compounds (T-VSC), hydrogen sulphide (H2 S) and methyl mercaptan (MM) concentrations in exhaled air...
July 20, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28718462/-preventive-dentistry-7-getting-rid-of-halitosis
#9
T M H de Jong, M L Laine
Halitosis or bad breath is a problem that affects many people and its source is generally found in the oral cavity (intra-oral halitosis). Bacteria in the oral cavity produce volatile sulphur compounds such as hydrogen sulphide and methyl mercaptan that not only emit an unpleasant odour, but may also have toxic effects on the periodontal tissues. Good oral hygiene, a healthy periodontium and healthy teeth are the basis for the prevention of intra-oral halitosis and dentists and dental hygienists therefore play an essential role in its prevention...
July 2017: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/28671709/transient-receptor-potential-a1-trpa1-agonists-inhibit-contractions-of-the-isolated-human-ureter
#10
Philipp Weinhold, Martin Hennenberg, Frank Strittmatter, Christian G Stief, Christian Gratzke, Petter Hedlund
AIMS: Mechanoafferent and peristaltic mechanisms of the human ureter involve transient receptor potential V1 (TRPV1)- and purinoceptor-mediated functions. Hydrogen sulphide, an endogenous TRPA1 ligand, is linked to inhibitory neurotransmission of the pig ureter. No information is available on TRPA1 activity in the human ureter. We therefore examined the distribution and function of TRPA1 in the human ureter. METHODS: Expression of TRPA1 in human ureter tissue was studied by Western blot and immunofluorescence...
July 3, 2017: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/28636596/selective-sp-3-c-h-alkylation-via-polarity-match-based-cross-coupling
#11
Chip Le, Yufan Liang, Ryan W Evans, Ximing Li, David W C MacMillan
The functionalization of carbon-hydrogen (C-H) bonds is one of the most attractive strategies for molecular construction in organic chemistry. The hydrogen atom is considered to be an ideal coupling handle, owing to its relative abundance in organic molecules and its availability for functionalization at almost any stage in a synthetic sequence. Although many C-H functionalization reactions involve C(sp(3))-C(sp(2)) coupling, there is a growing demand for C-H alkylation reactions, wherein sp(3) C-H bonds are replaced with sp(3) C-alkyl groups...
June 21, 2017: Nature
https://www.readbyqxmd.com/read/28631296/hydrogen-sulphide-as-a-signalling-molecule-regulating-physiopathological-processes-in-gastrointestinal-motility
#12
REVIEW
M Jimenez, V Gil, M Martinez-Cutillas, N Mañé, D Gallego
The biology of H2 S is a still developing area of research and several biological functions have been recently attributed to this gaseous molecule in many physiological systems, including the cardiovascular, urogenital, respiratory, digestive and central nervous system (CNS). H2 S exerts anti-inflammatory effects and can be considered an endogenous mediator with potential effects on gastrointestinal motility. During the last few years, we have investigated the role of H2 S as a regulator of gastrointestinal motility using both animal and human tissues...
September 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28622279/hydrogen-sulfide-in-exhaled-gases-from-ventilated-septic-neonates-and-children-a-preliminary-report
#13
Natalie Bee, Ruth White, Andy J Petros
OBJECTIVES: There is increasing interest in hydrogen sulfide as a marker of pathologic conditions or predictors of outcome. We speculate that as hydrogen sulfide is a diffusible molecule, if there is an increase in plasma hydrogen sulfide in sepsis, it may accumulate in the alveolar space and be detected in exhaled gas. We wished to determine whether we could detect hydrogen sulfide in exhaled gases of ventilated children and neonates and if the levels changed in sepsis. DESIGN: Prospective, observational study...
August 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28608965/hydrogen-sulphide-modulating-mitochondrial-morphology-to-promote-mitophagy-in-endothelial-cells-under-high-glucose-and-high-palmitate
#14
Ning Liu, Jichao Wu, Linxue Zhang, Zhaopeng Gao, Yu Sun, Miao Yu, Yajun Zhao, Shiyun Dong, Fanghao Lu, Weihua Zhang
Endothelial cell dysfunction is one of the main reasons for type II diabetes vascular complications. Hydrogen sulphide (H2 S) has antioxidative effect, but its regulation on mitochondrial dynamics and mitophagy in aortic endothelial cells under hyperglycaemia and hyperlipidaemia is unclear. Rat aortic endothelial cells (RAECs) were treated with 40 mM glucose and 200 μM palmitate to imitate endothelium under hyperglycaemia and hyperlipidaemia, and 100 μM NaHS was used as an exogenous H2 S donor. Firstly, we demonstrated that high glucose and palmitate decreased H2 S production and CSE expression in RAECs...
June 13, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28585175/nematicidal-effect-of-rhizobacteria-on-plant-parasitic-nematodes-associated-with-vineyards
#15
E Aballay, S Prodan, A Zamorano, C Castaneda-Alvarez
The action of metabolites and exoenzymes from rhizobacteria on different plant-parasitic nematodes has an influence on the nematicidal efficacy of the microbe. Seven rhizobacteria, divided into two bacterial groups, were evaluated in vitro for nematicidal activity on Meloidogyne ethiopica and Xiphinema index. The direct effect of their filtrates on egg hatching and juveniles of M. ethiopica as well as mobile stages of X. index was evaluated during a 72-h period. The production of four exoenzymes and two metabolites associated with nematode mortality was investigated...
July 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28577401/enhanced-protection-of-pdms-embedded-palladium-catalysts-by-co-embedding-of-sulphide-scavengers
#16
Daniele Comandella, Min Hyung Ahn, Hojeong Kim, Katrin Mackenzie
For Pd-containing hydrodechlorination catalysts, coating with poly(dimethyl siloxane) (PDMS) was proposed earlier as promising protection scheme against poisoning. The PDMS coating can effectively repel non-permeating poisons (such as SO3(2-)) retaining the hydrodechlorination Pd activity. In the present study, the previously achieved protection efficiency was enhanced by incorporation of sulphide scavengers into the polymer. The embedded scavengers were able to bind permeating non-ionic poisons (such as H2S) during their passage through PDMS prior to Pd contact which ensured an extended catalyst lifetime...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28512525/h2s-donor-nahs-changes-the-production-of-endogenous-h2s-and-no-in-d-galactose-induced-accelerated-ageing
#17
Wei Wu, Cui-Lan Hou, Xue-Pan Mu, Chen Sun, Yi-Chun Zhu, Ming-Jie Wang, Qian-Zhou Lv
Aims. The study was designed to explore whether hydrogen sulphide (H2S) and nitric oxide (NO) generation changed in D-galactose- (D-gal-) induced ageing, the possible effects of exogenous H2S supplementation, and related mechanisms. Results. In D-gal-induced senescent mice, both H2S and NO levels in the heart, liver, and kidney tissues were decreased significantly. A similar trend was observed in D-gal-challenged human umbilical vein endothelial cells (HUVECs). Sustained H2S donor (NaHS) treatment for 2 months elevated H2S and NO levels in these mice, and during this period, the D-gal-induced senescent phenotype was reversed...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28494485/rotorua-hydrogen-sulphide-and-parkinson-s-disease-a-possible-beneficial-link
#18
REVIEW
Yusuf O Cakmak
AIM: Rotorua city (New Zealand) is known for its 'rotten egg' smell, due to high levels of hydrogen sulphide (H2S) concentrations emitted from local geothermal vents. Studies have shown H2S as potentially toxic if too high in concentration. However, some health benefits have been observed at lower concentrations. This article summarises what is known about effects of H2S on health and postulates whether ambient air inhalation levels of H2S in Rotorua might have a therapeutic role in the management of motor symptoms in Parkinson's disease (PD)...
May 12, 2017: New Zealand Medical Journal
https://www.readbyqxmd.com/read/28484507/sulphurous-mineral-waters-new-applications-for-health
#19
REVIEW
Jose Manuel Carbajo, Francisco Maraver
Sulphurous mineral waters have been traditionally used in medical hydrology as treatment for skin, respiratory, and musculoskeletal disorders. However, driven by recent intense research efforts, topical treatments are starting to show benefits for pulmonary hypertension, arterial hypertension, atherosclerosis, ischemia-reperfusion injury, heart failure, peptic ulcer, and acute and chronic inflammatory diseases. The beneficial effects of sulphurous mineral waters, sulphurous mud, or peloids made from sulphurous mineral water have been attributed to the presence of sulphur mainly in the form of hydrogen sulphide...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28483497/bio-methane-from-an-aerobic-digestion-using-activated-carbon-adsorption
#20
Muhammad Farooq, Alexandra H Bell, M N Almustapha, John M Andresen
There is an increasing global demand for carbon-neutral bio-methane from an-aerobic digestion (AD) to be injected into national gas grids. Bio-gas, a methane -rich energy gas, is produced by microbial decomposition of organic matter through an-aerobic conditions where the presence of carbon dioxide and hydrogen sulphide affects its performance. Although the microbiological process in the AD can be tailored to enhance the bio-gas composition, physical treatment is needed to convert the bio-gas into bio-methane...
May 5, 2017: Anaerobe
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