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https://www.readbyqxmd.com/read/28641319/understanding-scuba-diving-fatalities-carbon-dioxide-concentrations-in-intra-cardiac-gas
#1
Vincent Varlet, Alejandro Dominguez, Marc Augsburger, Maisy Lossois, Coraline Egger, Cristian Palmiere, Raquel Vilarino, Silke Grabherr
INTRODUCTION: Important developments in the diagnosis of scuba diving fatalities have been made thanks to forensic imaging tool improvements. Multi-detector computed tomography (MDCT) permits reliable interpretation of the overall gaseous distribution in the cadaver. However, due to post-mortem delay, the radiological interpretation is often doubtful because the distinction between gas related to the dive and post-mortem decomposition artifactual gases becomes less obvious. METHODS: We present six cases of fatal scuba diving showing gas in the heart and other vasculature...
June 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/28641276/atherosclerosis-and-the-hydrogen-sulfide-signaling-pathway-therapeutic-approaches-to-disease-prevention
#2
Zhi-Jun Wang, Jian Wu, Wei Guo, Yi-Zhun Zhu
Hydrogen sulfide (H2S) is now admitted as a third gasotransmitter together with nitric oxide (NO) and carbon monoxide (CO), albeit it was originally considered as a foul and poisonous gas. Endogenous H2S production in mammalian cells is counting on the three enzymes acting on cysteine. Involvement of H2S in various physiological and pathological processes has been extensively studied in the last fifteen years. Mounting evidence suggests that H2S is able to protect against atherosclerosis development and progression...
June 23, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28634470/the-dark-side-of-the-mushroom-spring-microbial-mat-life-in-the-shadow-of-chlorophototrophs-ii-metabolic-functions-of-abundant-community-members-predicted-from-metagenomic-analyses
#3
Vera Thiel, Michael Hügler, David M Ward, Donald A Bryant
Microbial mat communities in the effluent channels of Octopus and Mushroom Springs within the Lower Geyser Basin of Yellowstone National Park have been extensively characterized. Previous studies have focused on the chlorophototrophic organisms of the phyla Cyanobacteria and Chloroflexi. However, the diversity and metabolic functions of the other portion of the community in the microoxic/anoxic region of the mat are poorly understood. We recently described the diverse but extremely uneven microbial assemblage in the undermat of Mushroom Spring based on 16S rRNA amplicon sequences, which was dominated by Roseiflexus members, filamentous anoxygenic chlorophototrophs...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28633902/calcium-sensing-receptor-initiating-cystathionine-gamma-lyase-hydrogen-sulfide-pathway-to-inhibit-platelet-activation-in-hyperhomocysteinemia-rat
#4
Yuwen Wang, Ziqing Zhao, Sa Shi, Fei Gao, Jichao Wu, Shiyun Dong, Weihua Zhang, Yanhong Liu, Xin Zhong
Hyperhomocysteinemia (HHcy, high homocysteine) induces the injury of endothelial cells (ECs). Hydrogen sulfide (H2S) protects ECs and inhibits the activation of platelets. Calcium-sensing receptor (CaSR) regulates the production of endogenous H2S. However, whether CaSR inhibits the injury of ECs and the activation of platelets by regulating the endogenous cystathionine-gamma-lyase (CSE, a major enzyme that produces H2S)/H2S pathway in hyperhomocysteinemia has not been previously investigated. Here, we tested the ultrastructure alterations of ECs and platelets, the changes in the concentration of serum homocysteine and the parameters of blood of hyperhomocysteinemia rats were measured...
June 19, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28632388/accelerating-dynamics-of-h-on-graphene-by-coadsorbates
#5
Manh-Thuong Nguyen, Phong Nam Pham
There are several factors that affect the dynamics of adsorbed hydrogen atoms on a carbon surface, here, using density-functional calculations we show that coadsorption can be a highly influential factor. The diffusion of hydrogen adsorbed on graphene is explored in the presence of H-containing molecules. Without coadsorbates the diffusion barrier of H on graphene is 0.94 eV while with water/ammonia it is 0.85/0.12 eV. The low barrier in the case of ammonia is attributed to the formation of a stable intermediate state NH$_4$ while such a stable state is not found in the case of water...
June 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28632164/the-role-of-hemoproteins-hemoglobin-myoglobin-and-neuroglobin-in-endogenous-thiosulfate-production-processes
#6
REVIEW
Anna Bilska-Wilkosz, Małgorzata Iciek, Magdalena Górny, Danuta Kowalczyk-Pachel
Thiosulfate formation and biodegradation processes link aerobic and anaerobic metabolism of cysteine. In these reactions, sulfite formed from thiosulfate is oxidized to sulfate while hydrogen sulfide is transformed into thiosulfate. These processes occurring mostly in mitochondria are described as a canonical hydrogen sulfide oxidation pathway. In this review, we discuss the current state of knowledge on the interactions between hydrogen sulfide and hemoglobin, myoglobin and neuroglobin and postulate that thiosulfate is a metabolically important product of this processes...
June 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28624490/bioenergetics-dysfunction-mitochondrial-permeability-transition-pore-opening-and-lipid-peroxidation-induced-by-hydrogen-sulfide-as-relevant-pathomechanisms-underlying-the-neurological-dysfunction-characteristic-of-ethylmalonic-encephalopathy
#7
Gabriela Miranda Fernandez Cardoso, Julia Tauana Pletsch, Belisa Parmeggiani, Mateus Grings, Nícolas Manzke Glanzel, Larissa Daniele Bobermin, Alexandre Umpierrez Amaral, Moacir Wajner, Guilhian Leipnitz
Hydrogen sulfide (sulfide) accumulates at high levels in the brains of patients with ethylmalonic encephalopathy (EE). In the present study, we evaluated whether sulfide could disturb energy and redox homeostasis, and induce mitochondrial permeability transition (mPT) pore opening in rat brain aiming to better clarify the neuropathophysiology of EE. Sulfide decreased the activities of citrate synthase and aconitase in rat cerebral cortex mitochondria, and of creatine kinase (CK) in rat cerebral cortex, striatum and hippocampus supernatants...
June 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28623294/h2s-and-homocysteine-control-a-novel-feedback-regulation-of-cystathionine-beta-synthase-and-cystathionine-gamma-lyase-in-cardiomyocytes
#8
Shyam Sundar Nandi, Paras Kumar Mishra
Hydrogen sulfide (H2S), a cardioprotective gas, is endogenously produced from homocysteine by cystathionine beta synthase (CBS) and cystathionine gamma lyase (CSE) enzymes. However, effect of H2S or homocysteine on CBS and CSE expression, and cross-talk between CBS and CSE are unclear. We hypothesize that homocysteine and H2S regulate CBS and CSE expressions in a dose dependent manner in cardiomyocytes, and CBS deficiency induces cardiac CSE expression. To test the hypothesis, we treated murine atrial HL1 cardiomyocytes with increasing doses of homocysteine or Na2S/GYY4137, a H2S donor, and measured the levels of CBS and CSE...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28622633/generalized-parameter-estimation-and-calibration-for-biokinetic-models-using-correlation-and-single-variable-optimisations-application-to-sulfate-reduction-modelling-in-anaerobic-digestion
#9
Wasim Ahmed, Jorge Rodríguez
In this work, a generalized method for the estimation of biokinetic parameters in anaerobic digestion (AD) models is proposed. The method consists of a correlation-based approach to estimate specific groups of parameters mechanistically, followed by a sensitivity-based hierarchical and sequential single parameter optimisation (SHSSPO) calibration method for the remaining groups of parameters. The method was evaluated to estimate and calibrate the parameter values for sulfate reduction processes when included into the IWA Anaerobic Digestion Model No...
May 31, 2017: Water Research
https://www.readbyqxmd.com/read/28620758/transcriptome-analysis-of-drought-responsive-genes-regulated-by-hydrogen-sulfide-in-wheat-triticum-aestivum-l-leaves
#10
Hua Li, Min Li, Xingliang Wei, Xia Zhang, Ruili Xue, Yidan Zhao, Huijie Zhao
Drought is an environmental factor that deeply impacts wheat yield and quality. Hydrogen sulfide (H2S) is a known regulator of drought resistance in plants. To preliminarily elucidate the regulatory mechanisms of H2S on drought tolerance, the effects of H2S on drought-responsive genes were investigated by transcriptome analysis. As a result, a total of 7552 transcripts not only responded to drought stress but also exhibited differential expression relative to the polyethylene glycol (PEG) treatment (P) and the NaHS pretreatment with PEG treatment (SP)...
June 15, 2017: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/28618652/cross-talk-of-microrna-and-hydrogen-sulfide-a-novel-therapeutic-approach-for-bone-diseases
#11
REVIEW
Yuankun Zhai, Suresh C Tyagi, Neetu Tyagi
Bone homeostasis requires a balance between the bone formation of osteoblasts and bone resorption of osteoclasts to maintain ideal bone mass and bone quality. An imbalance in bone remodeling processes results in bone metabolic disorders such as osteoporosis. Hydrogen sulfide (H2S), a gasotransmitter, has attracted the focus of many researchers due to its multiple physiological functions. It has been implicated in anti-inflammatory, vasodilatory, angiogenic, cytoprotective, anti-oxidative and anti-apoptotic mechanisms...
June 10, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28615705/a-long-term-and-slow-releasing-hydrogen-sulfide-donor-protects-against-myocardial-ischemia-reperfusion-injury
#12
Xiaotian Sun, Wenshuo Wang, Jing Dai, Sheng Jin, Jiechun Huang, Changfa Guo, Chunsheng Wang, Liewen Pang, Yiqing Wang
Hydrogen sulfide (H2S) has been recognized as an important gasotransmitter exerting various physiological effects, especially in the cardiovascular system. Herein we investigated the cardioprotective effects of a novel long-term and slow-releasing H2S donor, DATS-MSN, using in vivo myocardial ischemia/reperfusion (I/R) models and in vitro hypoxia/reoxygenation cardiomyocyte models. Unlike the instant-releasing pattern of sodium hydrosulphide (NaHS), the release of H2S from DATS-MSN was quite slow and continuous both in the cell culture medium and in rat plasma (elevated H2S concentrations during 24 h and 72 h reperfusion)...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28615646/hydrogen-sulfide-stimulates-cftr-in-xenopus-oocytes-by-activation-of-the-camp-pka-signalling-axis
#13
Alexander Perniss, Kathrin Preiss, Marcel Nier, Mike Althaus
Hydrogen sulfide (H2S) has been recognized as a signalling molecule which affects the activity of ion channels and transporters in epithelial cells. The cystic fibrosis transmembrane conductance regulator (CFTR) is an epithelial anion channel and a key regulator of electrolyte and fluid homeostasis. In this study, we investigated the regulation of CFTR by H2S. Human CFTR was heterologously expressed in Xenopus oocytes and its activity was electrophysiologically measured by microelectrode recordings. The H2S-forming sulphur salt Na2S as well as the slow-releasing H2S-liberating compound GYY4137 increased transmembrane currents of CFTR-expressing oocytes...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28613823/inhibition-of-mitochondrial-bioenergetics-by-esterase-triggered-cos-h2s-donors
#14
Andrea K Steiger, Michela Marcatti, Csaba Szabo, Bartosz Szczesny, Michael D Pluth
Hydrogen sulfide (H2S) is an important biological mediator, and synthetic H2S donating molecules provide an important class of investigative tools for H2S research. Here we report esterase-activated H2S donors that function by first releasing carbonyl sulfide (COS), which is rapidly converted to H2S by the ubiquitous enzyme carbonic anhydrase (CA). We report the synthesis, self-immolative decomposition, and H2S release profiles of the developed scaffolds. In addition, the developed esterase-triggered COS/H2S donors exhibit higher levels of cytotoxicity than equivalent levels of Na2S or the common H2S donors GYY4137 and AP39...
June 14, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28613404/stability-and-activity-of-non-noble-based-catalysts-toward-the-hydrogen-evolution-reaction-feasible-electrocatalysts-in-acidic-medium
#15
Marc Ledendecker, Jared Mondschein, Olga Kasian, Simon Geiger, Daniel Göhl, Max Schalenbach, Aleksandar Zeradjanin, Serhiy Cherevko, Raymond E Schaak, Karl Mayrhofer
Fundamental understanding of the behavior of non-noble based materials toward the HER is crucial for the successful implementation into practical devices. Through the implementation of a highly sensitive online ICP-MS coupled to a scanning flow cell, an activity and stability protocol for non-noble electrocatalysts is presented. The studied catalysts comprise a range of compositions, including metal carbides (WC), sulfides (MoS2), phosphides (Ni5P4, Co2P), their base metals (W, Ni, Mo, Co) and their activity, stability and degradation behavior was elaborated and compared to platinum...
June 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28612609/surface-water-dependent-properties-of-sulfur-rich-molybdenum-sulfides-electrolyteless-gas-phase-water-splitting
#16
Torben Daeneke, Nripen Dahr, Paul Atkin, Rhiannon M Clark, Christopher J Harrison, Robert Brkljača, Naresh Pillai, Bao Yue Zhang, Ali Zavabeti, Samuel J Ippolito, Kyle J Berean, Jian Zhen Ou, Michael S Strano, Kourosh Kalantar-Zadeh
Sulfur-rich molybdenum sulfides are an emerging class of inorganic coordination polymers that are predominantly utilized for their superior catalytic properties. Here we investigate surface water dependent properties of sulfur-rich MoSx (x = 3(2)/3) and its interaction with water vapor. We report that MoSx is a highly hygroscopic semiconductor, which can reversibly bind up to 0.9 H2O molecule per Mo. The presence of surface water is found to have a profound influence on the semiconductor's properties, modulating the material's photoluminescence by over 1 order of magnitude, in transition from dry to moist ambient...
June 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/28612383/a-new-player-in-bacterial-sulfide-inducible-transcriptional-regulation
#17
David P Giedroc
Although hydrogen sulfide (H2 S) is perhaps best known as a toxic gas, the electron-rich H2 S functions as an energy source and electron donor for chemolithotrophic and photosynthetic bacteria, via sulfide oxidation, and is a universal substrate for cysteine biosynthesis. These distinct harmful and beneficial roles of H2 S suggest the need to "sense" prevailing concentrations of sulfide and downstream reactive sulfur species (RSS) and regulate the expression of genes mediating sulfide homeostasis. The paper by Li et al...
June 14, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28611379/transfer-behavior-of-odorous-pollutants-in-wastewater-sludge-system-under-typical-chemical-conditioning-processes-for-dewaterability-enhancement
#18
Hongyu Gao, Weijun Zhang, Zhenzhen Song, Xiaofang Yang, Lian Yang, Mengdi Cao, Dongsheng Wang, Guiying Liao
Chemical conditioning has been used for enhancing wastewater sludge dewaterability for many years, but the characteristics of odorous pollutants emission in sludge conditioning were still unclear. In this work, the transfer behavior of different odorous pollutants between air, liquid and solid phases under typical chemical conditioning processes for high-pressure dewatering was systematically investigated. The results indicated that that besides hydrogen sulfide (H2S) and ammonia (NH3), 21 kinds of volatile organic contaminants (VOCs) were identified and quantified by gas chromatography-mass spectrometry (GC-MS), while the concentrations and composition of odorous pollutants varied greatly for different conditioning processes...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28610958/sulfate-nitrate-and-blood-pressure-an-epic-interaction-between-sulfur-and-nitrogen
#19
Gunter G Kuhnle, Robert Luben, Kay-Tee Khaw, Martin Feelisch
Nitrate (NO3(-))-rich foods such as green leafy vegetables are not only part of a healthy diet, but increasingly marketed for primary prevention of cardiovascular disease (CVD) and used as ergogenic aids by competitive athletes. While there is abundant evidence for mild hypotensive effects of nitrate on acute application there is limited data on chronic intake in humans, and results from animal studies suggest no long-term benefit. This is important as nitrate can also promote the formation of nitrosamines...
June 10, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28610737/the-impact-of-wine-components-on-fractionation-of-cu-and-fe-in-model-wine-systems-macromolecules-phenolic-and-sulfur-compounds
#20
Nikolaos Kontoudakis, Mark Smith, Anque Guo, Paul A Smith, Geoffrey R Scollary, Eric N Wilkes, Andrew C Clark
A variety of techniques have been developed with the ability to measure different forms of metals in wine with the ultimate aim of providing a more accurate indicator of metal induced spoilage of wine. This study was conducted in order to identify which wine components influence the measurement of Cu and Fe in their fractionated and/or electrochemically active forms. The measurement techniques involved detection of labile Cu by stripping potentiometry and fractionation of Cu and Fe by sequential solid phase extraction, with detection by inductively coupled plasma-optical emission spectroscopy...
August 2017: Food Research International
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