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Hydrogen sulphide

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https://www.readbyqxmd.com/read/28718462/-preventive-dentistry-7-getting-rid-of-halitosis
#1
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
#2
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
#3
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-signaling-molecule-regulating-physiopathological-processes-in-gastrointestinal-motility
#4
REVIEW
M Jimenez, V Gil, M Martinez-Cutillas, N Mañé, D Gallego
The biology of H2 S is an emerging area of research since several biological functions have been recently attributed to this gaseous molecule in a vast number of regions including the cardiovascular, urogenital, respiratory, digestive and central nervous system. H2 S exerts anti-inflammatory effects and can be considered an endogenous mediator with potential effects on gastrointestinal motility. During the last years, our research group has investigated the role of H2 S as a regulator of gastrointestinal motility using both animal and human tissues...
June 20, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28622279/hydrogen-sulphide-in-exhaled-gases-from-ventilated-septic-neonates-and-children-a-preliminary-report
#5
Natalie Bee, Ruth White, Andy J Petros
OBJECTIVES: There is increasing interest in hydrogen sulphide as a marker of pathologic conditions or predictors of outcome. We speculate that as hydrogen sulphide is a diffusible molecule, if there is an increase in plasma hydrogen sulphide in sepsis, it may accumulate in the alveolar space and be detected in exhaled gas. "We wished to determine whether we could detect hydrogen sulphide in exhaled gases of ventilated children and neonates and if the levels changed in sepsis." DESIGN: Prospective, observational study...
June 15, 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
#6
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
#7
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
#8
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...
May 31, 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
#9
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
#10
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
#11
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
#12
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
https://www.readbyqxmd.com/read/28467198/chronic-nahs-treatment-decreases-oxidative-stress-and-improves-endothelial-function-in-diabetic-mice
#13
Hooi H Ng, Gunes S Yildiz, Jacqueline M Ku, Alyson A Miller, Owen L Woodman, Joanne L Hart
Hydrogen sulphide (H2S) is endogenously produced in vascular tissue and has anti-oxidant and vasoprotective properties. This study investigates whether chronic treatment using the fast H2S donor NaHS could elicit a vasoprotective effect in diabetes. Diabetes was induced in male C57BL6/J mice with streptozotocin (60 mg/kg daily, ip for 2 weeks) and confirmed by elevated blood glucose and glycated haemoglobin levels. Diabetic mice were then treated with NaHS (100 µmol/kg/day) for 4 weeks, and aortae collected for functional and biochemical analyses...
May 2017: Diabetes & Vascular Disease Research
https://www.readbyqxmd.com/read/28433660/redox-regulation-of-gasotransmission-in-the-vascular-system-a-focus-on-angiogenesis
#14
REVIEW
Rajesh K Mistry, Alison C Brewer
Reactive oxygen species have emerged as key participants in a broad range of physiological and pathophysiological processes, not least within the vascular system. Diverse cellular functions which have been attributed to some of these pro-oxidants within the vasculature include the regulation of blood pressure, neovascularisation and vascular inflammation. We here highlight the emerging roles of the enzymatically-generated reaction oxygen species, O2(-) and H2O2, in the regulation of the functions of the gaseous signalling molecules: nitric oxide (NO), carbon monoxide (CO), and hydrogen sulphide (H2S)...
April 19, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28423592/protective-effect-of-hydrogen-sulphide-against-myocardial-hypertrophy-in-mice
#15
Mingjing Shao, Chuanjun Zhuo, Ronghuan Jiang, Guangdong Chen, Jianmin Shan, Jing Ping, Hongjun Tian, Lina Wang, Chongguang Lin, Lirong Hu
Cardiac hypertrophy is a critical component of phenotype in the failing heart. Recently, increasing evidence has demonstrated that oxidative stress plays an important role in the pathogenesis of myocardial hypertrophy. In the present study, we generated a mouse model of transverse aortic constriction (TAC) to investigate whether hydrogen sulfide (H2S) has protective effects against cardiac hypertrophy. Left ventricular structure was analyzed by two-dimensional echocardiography. Oxidative stress was evaluated by measuring malondialdehyde, superoxide dismutase, glutathione peroxidase and reactive oxygen specie in the myocardium...
April 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28387464/a-novel-ph-controlled-hydrogen-sulfide-donor-protects-gastric-mucosa-from-aspirin-induced-injury
#16
Chun-Tao Yang, Zhen-Zhen Lai, Ze-Hang Zheng, Jian-Ming Kang, Ming Xian, Rui-Yu Wang, Kun Shi, Fu-Hui Meng, Xiang Li, Li Chen, Hui Zhang
Hydrogen sulphide (H2 S) serves as a vital gastric mucosal defence under acid condition. Non-steroidal anti-inflammatory drugs (NSAIDs) are among widely prescribed medications with effects of antipyresis, analgesia and anti-inflammation. However, their inappropriate use causes gastric lesions and endogenous H2 S deficiency. In this work, we reported the roles of a novel pH-controlled H2 S donor (JK-1) in NSAID-related gastric lesions. We found that JK-1 could release H2 S under mild acidic pH and increase solution pH value...
April 7, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28383289/effect-of-the-amount-of-nickel-sulphide-molybdenum-disulphide-and-carbon-nanosupport-on-a-tafel-slope-and-overpotential-optimization
#17
Maria Sarno, Eleonora Ponticorvo
A Tafel slope of 40 mV dec(-1) and a very small overpotential were measured for our NiSMoS2G nanocatalyst, prepared using a scalable approach, and consisting of NiS nanoparticles covered by a stabilizing coating of MoS2 nanosheets, on unsophisticated and easy to obtain physical exfoliated graphite. A careful study proves that it is possible to improve the Tafel slope and the overpotential through the optimization of amounts of the different components. The conductive nanocarbon network, the highly active to charge accumulation of NiS nanoparticles and the coupling with MoS2 nanosheets, exposing a large number of edges, result in a very high hydrogen production rate of 1...
May 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28366002/side-by-side-comparison-of-hydroperoxide-and-corresponding-alcohol-as-hydrogen-bond-donors
#18
Kristian H Møller, Camilla Mia Tram, Henrik G Kjaergaard
Hydroperoxides are formed in significant amounts in the atmosphere by oxidation of volatile organic compounds and are key in aerosol formation. In a room-temperature experiment, we detected the formation of bimolecular complexes of tert-butyl hydroperoxide (t-BuOOH) and the corresponding alcohol tert-butanol (t-BuOH), with dimethyl ether (DME) as the hydrogen-bond acceptor. Using a combination of Fourier-transform infrared spectroscopy and quantum chemical calculations, we compare the strength of the OH-O hydrogen bond and the total strength of complexation...
April 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28346391/hydrogen-sulphide-production-in-healthy-and-ulcerated-gastric-mucosa-of-rats
#19
Patrycja Bronowicka-Adamska, Maria Wróbel, Marcin Magierowski, Katarzyna Magierowska, Sławomir Kwiecień, Tomasz Brzozowski
Hydrogen sulphide (H₂S) is produced endogenously via two enzymes dependent on pyridoxal phosphate (PLP): cystathionine beta-synthase (CBS, EC 4.2.1.22), cystathionase γ-liase (CTH, EC 4.4.1.1), and a third, 3-mercaptopyruvate sulfurtransferase (MPST, EC 2.8.1.2). H₂S strengthens the defence mechanisms of the gastric mucosal barrier, and plays an important role in gastroprotection, including the increased resistance to damage caused by various irritants and non-steroidal anti-inflammatory drugs. The study was conducted to determine the role of H₂S in ulcerated gastric mucosa of rats caused by immobilization in cold water (WRS)...
March 27, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28251989/silver-nanoparticles-reduce-brain-inflammation-and-related-neurotoxicity-through-induction-of-h2s-synthesizing-enzymes
#20
Daniel A Gonzalez-Carter, Bey Fen Leo, Pakatip Ruenraroengsak, Shu Chen, Angela E Goode, Ioannis G Theodorou, Kian Fan Chung, Raffaella Carzaniga, Milo S P Shaffer, David T Dexter, Mary P Ryan, Alexandra E Porter
Silver nanoparticles (AgNP) are known to penetrate into the brain and cause neuronal death. However, there is a paucity in studies examining the effect of AgNP on the resident immune cells of the brain, microglia. Given microglia are implicated in neurodegenerative disorders such as Parkinson's disease (PD), it is important to examine how AgNPs affect microglial inflammation to fully assess AgNP neurotoxicity. In addition, understanding AgNP processing by microglia will allow better prediction of their long term bioreactivity...
March 2, 2017: Scientific Reports
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