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Hydrogen Sulfide

Mostrando 13-24 de 228 artigos, teses e dissertações.

13. Evaluation of hydrogen-Induced cracking resistance of the In625 laser coating system on a C-Mn steel substrate

Abstract The corrosion of C-Mn steels in the presence of hydrogen sulfide (H2S) represents a significant challenge to oil production and natural gas treatment facilities. The failure mechanism induced by hydrogen-induced cracking (HIC) in a Inconel 625 coating / C-Mn steel has not been extensively investigated in the past. In the present work, an API 5CT ste

REM, Int. Eng. J.. Publicado em: 2017-06
14. Evaluation of Corrosion Caused by the use of In Natura Biogas in Steam Generator Boilers of Carbon Steel Structural Elements

This work evaluates the corrosion process caused by the presence of hydrogen sulfide in the biogas in natura, in steels commonly used in the construction of steam generator boilers, simulating conditions close to those found on the real application of these materials, exposing the test bodies directly to biogas in natura, flame of combustion and gases result

Mat. Res.. Publicado em: 10/04/2017
15. Effect of tobacco smoke on hydrogen sulfide-induced rat thoracic aorta relaxation

Levels of hydrogen sulfide (H2S), a gaseous signaling molecule, are reduced in the serum of individuals who smoke. We hypothesized that tobacco smoke influenced smooth muscle relaxation by decreasing H2S levels and this effect could also influence expression of cystathionine γ-lyase (CSE) and sulfonylurea receptor-2 (SUR-2). The aim of this study was to exp

Braz J Med Biol Res. Publicado em: 06/02/2017
16. STRIPPING AND DISSIPATION TECHNIQUES FOR THE REMOVAL OF DISSOLVED GASES FROM ANAEROBIC EFFLUENTS

Abstract UASB reactors are a common technology for wastewater treatment. However, certain disadvantages must be considered. One of the disadvantages relates to the presence of dissolved gases, hydrogen sulfide and methane, in the effluent, which can potentially be released into the atmosphere. This can cause malodours and contribute to the greenhouse effect.

Braz. J. Chem. Eng.. Publicado em: 2016-12
17. ANAEROBIC DIGESTION OF WASTEWATER WITH HIGH SULFATE CONCENTRATION USING MICRO-AERATION AND NATURAL ZEOLITES

Abstract The behavior of anaerobic digestion in batch and UASB reactors using a microaerobic process and natural zeolites was studied. Laboratory assays were carried out across 4 sets of variables: different COD/SO42- ratios, different airflow levels, with and without natural zeolites and room and mesophilic controlled temperatures. The microaerobic process

Braz. J. Chem. Eng.. Publicado em: 2016-12
18. INVESTIGATION OF IMPREGNATED ACTIVATED CARBON PROPERTIES USED IN HYDROGEN SULFIDE FINE REMOVAL

Abstract The effects of relative humidity (RH), carbon dioxide (CO2), methane (CH4), oxygen (O2) presence and gas hourly space velocity (GHSV) on H2S adsorption dynamics of KOH/CaO impregnated activated carbon are investigated in this study. X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray detector (SEM-EDX), thermogravimetr

Braz. J. Chem. Eng.. Publicado em: 2016-12
19. In vitro effects of Melaleuca alternifolia essential oil on growth and production of volatile sulphur compounds by oral bacteria

ABSTRACT Objective Halitosis can be caused by microorganisms that produce volatile sulphur compounds (VSCs), which colonize the surface of the tongue and subgingival sites. Studies have reported that the use of natural products can reduce the bacterial load and, consequently, the development of halitosis. The aim of this study was to evaluate the antimicro

J. Appl. Oral Sci.. Publicado em: 2016-12
20. CALCULATION OF CONDITIONAL EQUILIBRIUM IN SERIAL MULTIPLE PRECIPITATION OF METAL SULFIDES WITH HYDROGEN SULFIDE STREAM GENERATED FROM SODIUM SULFIDE: A DIDACTIC TOOL FOR CHEMISTRY TEACHING

Hydrogen sulfide is presented in textbooks as toxic, environmentally unacceptable species, however some positive effects in human metabolism were discovered in the last decades. It is important to offer students also some new information about this compound. As didactic tool in this case may serve serial precipitation of Cd2+, Cu2+, Zn2+, Mn2+ and Pb2+ ions

Quím. Nova. Publicado em: 2016-07
21. Protective effect of hydrogen sulfide on renal injury in the experimental unilateral ureteral obstruction

Introduction/Objective: Ureteral obstruction is a common pathology and causes kidney fibrosis and dysfunction at late period. In this present study, we investigated the antifibrotic and antiinflammatory effects of hydrogen sulfide on kidney damage after unilateral ureteral obstruction (UUO) in rats. Materials and Methods: 24 rats were divided into four gro

Int. braz j urol.. Publicado em: 2015-12
22. Studying inhibition of calcium oxalate stone formation: an in vitro approach for screening hydrogen sulfide and its metabolites

ABSTRACTPurpose:
Calcium oxalate urolithiasis is one of the most common urinary tract diseases and is of high prevalence. The present study proposes to evaluate the antilithiatic property of hydrogen sulfide and its metabolites like thiosulfate & sulfate in an in vitro model.
Materials and Methods:</t </p> <p class="small left"> <em>Int. braz j urol.</em>. Publicado em: 2015-06 </p> </a> </span> </li> <li class="col-md-4 product"> <span class="product-thumb-info"> <a href="https://www.radarciencia.org/artigo/hydrogen-sulfide-in-posthemorrhagic-shock-mesenteric-lymph-drainage-alleviates-kidney-injury-in-rats"> <h5>23. Hydrogen sulfide in posthemorrhagic shock mesenteric lymph drainage alleviates kidney injury in rats</h5> </a> <a href="https://www.radarciencia.org/artigo/hydrogen-sulfide-in-posthemorrhagic-shock-mesenteric-lymph-drainage-alleviates-kidney-injury-in-rats"> <p class="small left"> Posthemorrhagic shock mesenteric lymph (PHSML) is a key factor in multiple organ injury following hemorrhagic shock. We investigated the role of hydrogen sulfide (H2S) in PHSML drainage in alleviating acute kidney injury (AKI) by administering D,L-propargylglycine (PPG) and sodium hydrosulfide hydrate (NaHS) to 12 specific pathogen-free male Wistar rats with </p> <p class="small left"> <em>Braz J Med Biol Res</em>. Publicado em: 28/04/2015 </p> </a> </span> </li> <li class="col-md-4 product"> <span class="product-thumb-info"> <a href="https://www.radarciencia.org/artigo/effects-of-stress-hormones-on-the-production-of-volatile-sulfur-compounds-by-periodontopathogenic-bacteria"> <h5>24. Effects of stress hormones on the production of volatile sulfur compounds by periodontopathogenic bacteria</h5> </a> <a href="https://www.radarciencia.org/artigo/effects-of-stress-hormones-on-the-production-of-volatile-sulfur-compounds-by-periodontopathogenic-bacteria"> <p class="small left"> Little is known about the effects of stress hormones on the etiologic agents of halitosis. Thus, the aim of this study was to evaluate in vitro the effects of adrenaline (ADR), noradrenaline (NA) and cortisol (CORT) on bacteria that produce volatile sulfur compounds (VSC), the major gases responsible for bad breath. Cultures of Fusobacterium nucleatum (Fn), </p> <p class="small left"> <em>Braz. oral res.</em>. 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