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Hydrogen sulphide

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https://www.readbyqxmd.com/read/27910968/designing-hierarchical-hollow-nanostructures-of-cu2mos4-for-improved-hydrogen-evolution-reaction
#1
Ke Zhang, Yongli Zheng, Yunxiang Lin, Changda Wang, Hengjie Liu, Daobin Liu, Chuanqiang Wu, Shuangming Chen, Yanxia Chen, Li Song
Layered Cu2MoS4, consisting of earth-abundant elements, is regarded as a potential catalyst for the hydrogen evolution reaction (HER). Herein, we demonstrate a Cu2O-based template strategy to synthesise hierarchical hollow nanostructures of Cu2MoS4. The characterizations reveal that the electrochemically active surface of the hollow Cu2MoS4 is largely enhanced, in contrast to the nanosheet or nanoparticle structures. As the direct outcome, the designed hierarchical hollow structures display excellent HER activities with a low overvoltage and small Tafel slope...
December 2, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27873232/evidence-based-revised-view-of-the-pathophysiology-of-preeclampsia
#2
Asif Ahmed, Homira Rezai, Sophie Broadway-Stringer
Preeclampsia is a life-threatening vascular disorder of pregnancy due to a failing stressed placenta. Millions of women risk death to give birth each year and globally each year, almost 300,000 lose their life in this process and over 500,000 babies die as a consequence of preeclampsia. Despite decades of research, we lack pharmacological agents to treat it. Maternal endothelial oxidative stress is a central phenomenon responsible for the preeclampsia phenotype of high maternal blood pressure and proteinuria...
November 22, 2016: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/27796938/plasma-hydrogen-sulphide-does-not-predict-severity-of-acute-pancreatitis-in-humans
#3
Iqbal N Qureshi, Deepu David, Kavitha R Thangaraj, Reuben T Kurien, Sudipta D Chowdhury, Ashish Goel, Amit K Dutta, Ebby G Simon, Anup Ramachandran, Kunissery A Balasubramanian, Anjilivelil J Joseph
The primary aim of this study was to assess the usefulness of plasma hydrogen sulphide (H2S) level at admission as a predictor of severity of acute pancreatitis. The secondary aims were to examine whether the level of H2S after 48 h correlated with severity and whether level of H2S correlated with pulmonary, renal or infectious complications. Plasma hydrogen sulphide was measured within 24 h of admission and 48 h later, in patients with acute pancreatitis. Patients were classified as having mild or severe pancreatitis, and H2S levels in the two groups were compared...
October 29, 2016: Indian Journal of Gastroenterology: Official Journal of the Indian Society of Gastroenterology
https://www.readbyqxmd.com/read/27779471/the-adaptive-role-of-nitric-oxide-and-hydrogen-sulphide-in-vasoactive-responses-of-thoracic-aorta-is-triggered-already-in-young-spontaneously-hypertensive-rats
#4
S Cacanyiova, A Berenyiova, F Kristek, M Drobna, K Ondrias, M Grman
The aorta plays an important role in blood pressure control so the early determination of its vasoactive properties could predict pathological changes in hypertension. The aim of study was to compare vasoactive properties and geometry of thoracic aorta (TA) and the participation of two vasoactive transmitters, nitric oxide (NO) and hydrogen sulphide (H2S), in TA tone regulation in young Wistar rats (WR) and spontaneously hypertensive rats (SHR). Four-weeks-old WR and SHR were used. Systolic blood pressure (sBP) was measured by plethysmography...
August 2016: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/27775418/cardiovascular-effects-of-gasotransmitter-donors
#5
M Cebová, M Košútová, O Pecháňová
Gasotransmitters represent a subfamily of the endogenous gaseous signaling molecules that include nitric oxide (NO), carbon monoxide (CO), and hydrogen sulphide (H(2)S). These particular gases share many common features in their production and function, but they fulfill their physiological tasks in unique ways that differ from those of classical signaling molecules found in tissues and organs. These gasotransmitters may antagonize or potentiate each other's cellular effects at the level of their production, their downstream molecular targets and their direct interactions...
October 24, 2016: Physiological Research
https://www.readbyqxmd.com/read/27775417/the-role-of-hydrogen-sulphide-in-blood-pressure-regulation
#6
S Cacanyiova, A Berenyiova, F Kristek
Cardiovascular studies have confirmed that hydrogen sulphide (H(2)S) is involved in various signaling pathways in both physiological and pathological conditions, including hypertension. In contrast to nitric oxide (NO), which has a clear vasorelaxant action, H(2)S has both vasorelaxing and vasoconstricting effects on the cardiovascular system. H(2)S is an important antihypertensive agent, and the reduced production of H(2)S and the alterations in its functions are involved in the initiation of spontaneous hypertension...
October 24, 2016: Physiological Research
https://www.readbyqxmd.com/read/27704382/cleaner-processing-a-sulphide-free-approach-for-depilation-of-skins
#7
Ammasi Ranjithkumar, Jayanthi Durga, Ramakrishnan Ramesh, Chellan Rose, Chellappa Muralidharan
The conventional unhairing process in leather making utilises large amount of lime and sodium sulphide which is hazardous and poses serious waste disposal concerns. Under acidic conditions, sodium sulphide liberates significant quantities of hydrogen sulphide which causes frequent fatal accidents. Further, the conventional unhairing process involves destruction of the hair leading to increased levels of biological oxygen demand (BOD), chemical oxygen demand (COD), total dissolved solids (TDS) and total suspended solids (TSS) in the effluent...
October 5, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27616550/the-novel-h2s-donor-4-carboxyphenyl-isothiocyanate-promotes-cardioprotective-effects-against-ischemia-reperfusion-injury-through-activation-of-mitokatp-channels-and-reduction-of-oxidative-stress
#8
Lara Testai, Alice Marino, Ilaria Piano, Vincenzo Brancaleone, Kengo Tomita, Lorenzo Di Cesare Mannelli, Alma Martelli, Valentina Citi, Maria C Breschi, Roberto Levi, Claudia Gargini, Mariarosaria Bucci, Giuseppe Cirino, Carla Ghelardini, Vincenzo Calderone
The endogenous gasotransmitter hydrogen sulphide (H2S) is an important regulator of the cardiovascular system, particularly of myocardial function. Moreover, H2S exhibits cardioprotective activity against ischemia/reperfusion (I/R) or hypoxic injury, and is considered an important mediator of "ischemic preconditioning", through activation of mitochondrial potassium channels, reduction of oxidative stress, activation of the endogenous "anti-oxidant machinery" and limitation of inflammatory responses. Accordingly, H2S-donors, i...
September 9, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27577876/modeling-gas-generation-for-landfill
#9
Sumedha Chakma, Shashi Mathur
A methodology was developed to predict the optimum long-term spatial and temporal generation of landfill gases such as methane, carbon dioxide, ammonia, and hydrogen sulphide on post closure landfill. The model incorporated the chemical and the biochemical processes responsible for the degradation of the municipal solid waste. The developed model also takes into account the effects of heterogeneity with different layers as observed at the site of landfills morphology. The important parameters for gas generation due to biodegradation such as temperature, pH and moisture content were incorporated...
August 31, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27562700/optimization-of-operating-parameters-for-gas-phase-photocatalytic-splitting-of-h2s-by-novel-vermiculate-packed-tubular-reactor
#10
V Preethi, S Kanmani
Hydrogen production by gas-phase photocatalytic splitting of Hydrogen Sulphide (H2S) was investigated on four semiconductor photocatalysts including CuGa1.6Fe0.4O2, ZnFe2O3, (CdS + ZnS)/Fe2O3 and Ce/TiO2. The CdS and ZnS coated core shell particles (CdS + ZnS)/Fe2O3 shows the highest rate of hydrogen (H2) production under optimized conditions. Packed bed tubular reactor was used to study the performance of prepared photocatalysts. Selection of the best packing material is a key for maximum removal efficiency...
October 1, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27530898/anions-as-triggers-in-controlled-release-protocols-from-mesoporous-silica-nanoparticles-functionalized-with-macrocyclic-copper-ii-complexes
#11
Sameh El Sayed, Michele Milani, Chiara Milanese, Maurizio Licchelli, Ramón Martínez-Máñez, Félix Sancenón
Three different mesoporous silica nano-sized materials (SC1, SC2, and SC3), loaded with [Ru(bipy)3 ](2+) dye (bipy=bipyridine) and functionalized on the external surface with three macrocyclic copper(II) complexes (C1, C2, and C3), were synthesized and characterized. When SC1, SC2, and SC3 were suspended in water, the entrapped [Ru(bipy)3 ](2+) dye was free to diffuse from the inner pores to the solution. However, addition of anions induced certain degrees of pore blockage, with subsequent dye release inhibition...
September 19, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27525636/capsaicin-sensitive-sensory-nerves-mediate-the-cellular-and-microvascular-effects-of-h2s-via-trpa1-receptor-activation-and-neuropeptide-release
#12
Zsófia Hajna, Éva Sághy, Maja Payrits, Aisah A Aubdool, Éva Szőke, Gábor Pozsgai, István Z Bátai, Lívia Nagy, Dániel Filotás, Zsuzsanna Helyes, Susan D Brain, Erika Pintér
It is supposed that TRPA1 receptor can be activated by hydrogen sulphide (H2S). Here, we have investigated the role of TRPA1 receptor in H2S-induced [Ca(2+)]i increase in trigeminal ganglia (TRG) neurons, and the involvement of capsaicin-sensitive sensory nerves in H2S-evoked cutaneous vasodilatation. [Ca(2+)]i was measured with ratiometric technique on TRG neurons of TRPA1(+/+) and TRPA1(-/-) mice after NaHS, Na2S, allylisothiocyanate (AITC) or KCl treatment. Microcirculatory changes in the ear were detected by laser Doppler imaging in response to topical NaHS, AITC, NaOH, NaSO3 or NaCl...
October 2016: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/27488892/hydrogen-sulfide-as-a-regulator-of-respiratory-epithelial-sodium-transport-the-role-of-sodium-potassium-atpase-focus-on-hydrogen-sulfide-contributes-to-hypoxic-inhibition-of-airway-transepithelial-sodium-absorption
#13
James Peter Garnett, J C Leiter
No abstract text is available yet for this article.
September 1, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27488281/redefining-the-role-of-peripheral-lps-as-a-neuroinflammatory-agent-and-evaluating-the-role-of-hydrogen-sulphide-through-metformin-intervention
#14
Virendra Tiwari, Manjari Singh, Jitendra K Rawat, Uma Devi, Rajnish K Yadav, Subhadeep Roy, Swetlana Gautam, Shubhini A Saraf, Vikas Kumar, Nazam Ansari, Abdulaziz S Saeedan, Gaurav Kaithwas
OBJECTIVE: The present study was aimed to enumerate the role of metformin-associated H2S release against lipopolysaccharide (LPS) induced neuroinflammation. MATERIALS AND METHODS: Five groups of animals were subjected to treatment as control (normal saline), toxic control (LPS, 125 µg/kg, i.p.), and three separate groups treated with 6.25, 12.5, and 25 mg/kg of metformin along with LPS for a period of 28 days. LPS was administered on 1st, 2nd, 3rd, 4th, 23rd, 24th, 25th and 26th day...
October 2016: Inflammopharmacology
https://www.readbyqxmd.com/read/27419805/hydrogen-sulphide-exacerbates-acute-pancreatitis-by-over-activating-autophagy-via-ampk-mtor-pathway
#15
Liang Ji, Le Li, Fengzhi Qu, Guangquan Zhang, Yongwei Wang, Xuewei Bai, Shangha Pan, Dongbo Xue, Gang Wang, Bei Sun
Previously, we have shown that hydrogen sulphide (H2 S) might be pro-inflammatory during acute pancreatitis (AP) through inhibiting apoptosis and subsequently favouring a predominance of necrosis over apoptosis. In this study, we sought to investigate the detrimental effects of H2 S during AP specifically with regard to its regulation on the impaired autophagy. The incubated levels of H2 S were artificially intervened by an administration of sodium hydrosulphide (NaHS) or DL-propargylglycine (PAG) after AP induction...
July 15, 2016: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/27412081/effect-of-bacillus-spp-direct-fed-microbial-on-slurry-characteristics-and-gaseous-emissions-in-growing-pigs-fed-with-high-fibre-based-diets
#16
F X Prenafeta-Boldú, B Fernández, M Viñas, R Lizardo, J Brufau, A Owusu-Asiedu, M C Walsh, A Awati
A 26-day trial with 18 Pietrain×(Landrace×Duroc) pigs was conducted to investigate the effect of two dose levels of a specifically selected Bacillus spp. direct-fed microbial (DFM) product, on the emission of environmentally harmful gasses (methane, ammonia and hydrogen sulphide) from manure. Pigs were assigned to one of three treatments in a randomized complete block design according to their sex and initial BW. Each treatment contained three replications with two pigs per pen. The test treatments included a Bacillus spp...
July 14, 2016: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/27337237/the-effect-of-hydrogen-sulphide-on-experimental-cerebral-vasospasm
#17
Hakan Emmez, Alp Özgün Börcek, Ýpek Iþýk Gönül, Hayrunnisa Bolay Belen, Ýhsan Solaroðlu, M Kemali Baykaner
AIM: Cerebral vasospasm is the primary cause of morbidity and mortality after subarachnoid hemorrhage (SAH). Hydrogen Sulfide (H2S), a gaseous neurotransmitter, is produced in many tissues including the central nervous system. The vasodilatatory effect of H2S has been shown in the CNS; however, its role in cerebral vasospasm has not been investigated before. MATERIAL AND METHODS: The rats were divided into 8 groups: control, SAH, sodium hydrosulphide (NaHS), propargylglycine (PPG), aminooxyacetic acid (AOAA), SAH+NaHS, SAH+PPG, and SAH+AOAA...
November 13, 2015: Turkish Neurosurgery
https://www.readbyqxmd.com/read/27332857/enumeration-of-sulphate-reducing-bacteria-for-assessing-potential-for-hydrogen-sulphide-production-in-urban-drainage-systems
#18
Esther Karunakaran, Dejan Vernon, Catherine A Biggs, Adrian Saul, David Crawford, Henriette Jensen
Urban drainage structures have increasing demands which can lead to increasing hydrogen sulphide related problems forming in places where they have not previously been prevalent. This puts pressure on the methods currently used to monitor and diagnose these problems and more sophisticated methods may be needed for identifying the origin of the problems. Molecular microbiological techniques, such as quantitative polymerase chain reaction, offer a potential alternative for identifying and quantifying bacteria likely to be causing the production of hydrogen sulphide, information that, when combined with an appropriate sampling programme, can then be used to identify the potentially most effective remediation technique...
2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27328808/duration-of-effect-of-the-mouthwash-cb12-for-the-treatment-of-intra-oral-halitosis-a-double-blind-randomised-controlled-trial
#19
Rainer Seemann, Andreas Filippi, Sebastian Michaelis, Susanne Lauterbach, Hans-Dieter John, Jörg Huismann
Halitosis occurs in approximately 30% of the adult population and has a negative social and psychological impact on affected individuals. Mouthwashes may be used to prevent unpleasant odour, with long-duration of effect being a desirable attribute. The aim of this study was to assess the long-term efficacy of CB12 (a mixture of 0.3% zinc acetate and 0.025% chlorhexidine) for the treatment of intra-oral halitosis. Thirty-four subjects with confirmed intra-oral halitosis were randomized into a double-blind, controlled, cross-over study to one of 2 groups; (i) CB12-water-water or (ii) water-CB12-CB12...
2016: Journal of Breath Research
https://www.readbyqxmd.com/read/27324218/delayed-gastric-emptying-in-diabetic-rats-caused-by-decreased-expression-of-cystathionine-gamma-lyase-and-h2-s-synthesis-in-vitro-and-in-vivo-studies
#20
S A Mard, I Ahmadi, A Ahangarpour, M K Gharib-Naseri, M Badavi
BACKGROUND: This study aimed to evaluate the role of H2 S on gastric emptying rate (GER) and also to determine the effect of gastric distention on mRNA and protein expression of cystathionine β-lyase (CBS) and cystathionine γ-synthase (CSE) in diabetic-gastroparetic and normal rats. METHODS: Adult normal rats intraperitoneally received either propargylglycine (PAG), L-cysteine or NaHS 30 min prior to GER marker (acetaminophen) to investigate H2 S involvement in GER and the same protocols were performed in diabetes-induced gastroparesis rats...
June 20, 2016: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
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