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Hydrogen sulphide

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
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
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
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
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
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
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
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
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
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
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
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
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
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
Ruilong Zhang, Shijiang Liu, Jianping Wang, Guangmei Han, Linlin Yang, Bianhua Liu, Guijian Guan, Zhongping Zhang
Luminescent chemosensors for hydrogen sulphide (H2S) are of great interest because of the close association of H2S with our health. However, current probes for H2S detection have problems such as low sensitivity/selectivity, poor aqueous-solubility or interference from background fluorescence. This study reports an ultrasensitive and time-gated "switch on" probe for detection of H2S, and its application in test paper for visualization of exhaled H2S. The complex probe is synthesized with a luminescent Tb(3+) centre and three ligands of azido (-N3) substituted pyridine-2,6-dicarboxylic acid, giving the probe high hydrophilicity and relatively fast reaction dynamics with H2S because there are three -N3 groups in each molecule...
August 2, 2016: Analyst
Mahima Singh, V J Rajesh, K S Sajinkumar, K Sajeev, S N Kumar
Coastal cliffs fringing the Arabian Sea near Varkala exhibits the Warkalli Formation of the Tertiary sequence of Kerala, South India, with well-marked occurrence of jarosite associated with other hydrous mineral phases of phyllosilicate family in a palaeo-lacustrine depositional environment. Sandy phyllosilicates dominate the mineral assemblage, but jarosite occurs as a prominent secondary phase formed during acid-sulphate alteration of iron sulphide in this area. Here, we discuss about the potentiality of spectroscopic techniques to identify the possible mineral phases in the collected samples...
November 5, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Benedikt L Nußbaum, Oscar McCook, Clair Hartmann, José Matallo, Martin Wepler, Elena Antonucci, Miriam Kalbitz, Markus Huber-Lang, Michael Georgieff, Enrico Calzia, Peter Radermacher, Sebastian Hafner
BACKGROUND: Reversible, depressed cardiac function is frequently encountered during septic shock and commonly called septic cardiomyopathy. Previous studies demonstrated reduced ejection fraction and left ventricular dilatation in both humans and animal models. However, the majority of the studies in humans excluded pre-existing cardiac disease and animal studies were performed on healthy specimen and/or without vasopressor support during sepsis. In order to more closely mimic the actual patients' conditions on intensive care units and to assess the influence of both cardiac comorbidity and vasopressor support on septic cardiomyopathy, we evaluated the left ventricular function in a porcine model of resuscitated septic shock with pre-existing atherosclerosis...
December 2016: Intensive Care Medicine Experimental
G Polizzotto, E Barone, G Ponticello, T Fasciana, D Barbera, O Corona, G Amore, A Giammanco, D Oliva
UNLABELLED: We isolated, identified and characterized yeast strains from grapes, and their fermented musts, sampled in the small island of Linosa, where there are no wineries and therefore the possibility of territory contamination by industrial strains is minimal. By traditional culture-dependent methods, we isolated 3805 colonies, distinguished by molecular methods in 17 different species. Five hundred and forty-four isolates were analysed for the main oenological characteristics such as fermentative vigour with and without sulphites, sugar consumption and production of alcohol, volatile acidity, hydrogen sulphide, glycerol and β-glucosidase...
August 2016: Letters in Applied Microbiology
J Pla-Tolós, Y Moliner-Martínez, J Verdú-Andrés, J Casanova-Chafer, C Molins-Legua, P Campíns-Falcó
A novel and low-cost colorimetric sensor for the determination of hydrogen sulphide in environmental samples has been developed. This sensor is based on the immobilization of the reagent N,N-Dimethyl-p-phenylenediamine and FeCl3 in paper support, in which the H2S is adsorbed in order to give rise to the formation of methylene blue as reaction product. The sensor has been applied to determine H2S in water and air samples. Two different sampling systems for H2S caption from the air have been assayed: active and passive sampling...
August 15, 2016: Talanta
Akos Botos, Johannes Biskupek, Thomas W Chamberlain, Graham A Rance, Craig T Stoppiello, Jeremy Sloan, Zheng Liu, Kazutomo Suenaga, Ute Kaiser, Andrei N Khlobystov
In organic synthesis, the composition and structure of products are predetermined by the reaction conditions; however, the synthesis of well-defined inorganic nanostructures often presents a significant challenge yielding nonstoichiometric or polymorphic products. In this study, confinement in the nanoscale cavities of single-walled carbon nanotubes (SWNTs) provides a new approach for multistep inorganic synthesis where sequential chemical transformations take place within the same nanotube. In the first step, SWNTs donate electrons to reactant iodine molecules (I2), transforming them to iodide anions (I(-))...
July 6, 2016: Journal of the American Chemical Society
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