keyword
MENU ▼
Read by QxMD icon Read
search

Hydrogen sulfide

keyword
https://www.readbyqxmd.com/read/28533768/novel-large-sulfur-bacteria-in-the-metagenomes-of-groundwater-fed-chemosynthetic-microbial-mats-in-the-lake-huron-basin
#1
Allison M Sharrar, Beverly E Flood, Jake V Bailey, Daniel S Jones, Bopaiah A Biddanda, Steven A Ruberg, Daniel N Marcus, Gregory J Dick
Little is known about large sulfur bacteria (LSB) that inhabit sulfidic groundwater seeps in large lakes. To examine how geochemically relevant microbial metabolisms are partitioned among community members, we conducted metagenomic analysis of a chemosynthetic microbial mat in the Isolated Sinkhole, which is in a deep, aphotic environment of Lake Huron. For comparison, we also analyzed a white mat in an artesian fountain that is fed by groundwater similar to Isolated Sinkhole, but that sits in shallow water and is exposed to sunlight...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28533366/mechanism-of-h2s-mediated-protection-against-oxidative-stress-in-escherichia-coli
#2
Alexander Mironov, Tatyana Seregina, Maxim Nagornykh, Lyly G Luhachack, Natalya Korolkova, Liubov Errais Lopes, Vera Kotova, Gennady Zavilgelsky, Rustem Shakulov, Konstantin Shatalin, Evgeny Nudler
Endogenous hydrogen sulfide (H2S) renders bacteria highly resistant to oxidative stress, but its mechanism remains poorly understood. Here, we report that 3-mercaptopyruvate sulfurtransferase (3MST) is the major source of endogenous H2S in Escherichia coli Cellular resistance to H2O2 strongly depends on the activity of mstA, a gene that encodes 3MST. Deletion of the ferric uptake regulator (Fur) renders ∆mstA cells hypersensitive to H2O2 Conversely, induction of chromosomal mstA from a strong pLtetO-1 promoter (P tet -mstA) renders ∆fur cells fully resistant to H2O2 Furthermore, the endogenous level of H2S is reduced in ∆fur or ∆sodA ∆sodB cells but restored after the addition of an iron chelator dipyridyl...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28527680/sensitivity-of-salivary-hydrogen-sulfide-to-psychological-stress-and-its-association-with-exhaled-nitric-oxide-and-affect
#3
Juliet L Kroll, Chelsey A Werchan, Audrey G Reeves, Kevin J Bruemmer, Alexander R Lippert, Thomas Ritz
BACKGROUND: Hydrogen sulfide (H2S) is the third gasotransmitter recently discovered after nitric oxide (NO) and carbon monoxide. Both NO and H2S are involved in multiple physiological functions. Whereas NO has been shown to vary with psychological stress, the influence of stress on H2S and the relationship between H2S and NO are unknown. We therefore examined levels of salivary H2S and NO in response to a stressful final academic exam period. METHODS: Measurements of stress, negative affect, and fraction of exhaled NO (FENO), were obtained from students (N=16) and saliva was collected at three time points: low-stress period in the semester, early exam period, and late exam period...
May 17, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28526796/sulfide-induced-dissimilatory-nitrate-reduction-to-ammonium-supports-anammox-in-an-open-water-unit-process-wetland
#4
Zackary L Jones, Justin T Jasper, David L Sedlak, Jonathan O Sharp
Open-water unit process wetlands host a benthic diatomaceous and bacterial assemblage capable of nitrate removal from treated municipal wastewater with unexpected contributions from anammox processes. In exploring mechanistic drivers of anammox, 16S rRNA gene sequencing profiles of the biomat revealed significant microbial community shifts along the flow path and with depth. Notably there was an increasing abundance of sulfate reducers (Desulfococcus and other Deltaproteobacteria) and anammox microorganisms (Brocadiaceae) with depth...
May 19, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28524651/electrodeposited-mo3s13-films-from-nh4-2mo3s13%C3%A2-2h2o-for-electrocatalysis-of-hydrogen-evolution-reaction
#5
Kuangzhou Du, Lirong Zheng, Tanyuan Wang, Junqiao Zhuo, Zhiwei Zhu, Yuanhua Shao, Meixian Li
Molybdenum sulfides are considered to be one kind of the promising candidates as cheap and efficient electrocatalysts for hydrogen evolution reaction (HER). But this is still a gap on electrocatalytic performance toward Pt. In order to further enhance electrocatalytic activity of molybdenum sulfides, in this work, Mo3S13 films with high ratio of sulfur to molybdenum were prepared by electrodeposition. The Mo3S13 films exhibit highly efficient electrocatalytic activity for HER and achieve a current density of 10 mA/cm2 at an overpotential of 200 mV with an onset potential of 130 mV vs...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28521159/distribution-and-genetic-diversity-of-microbial-populations-in-the-pilot-scale-biofilter-for-simultaneous-removal-of-ammonia-iron-and-manganese-from-real-groundwater
#6
Qingfeng Cheng, Lichao Nengzi, Linlin Bao, Yang Huang, Shengyu Liu, Xiuwen Cheng, Bo Li, Jie Zhang
A pilot-scale biofilter treating real groundwater was developed in this study, which showed that ammonia, iron and manganese were mainly removed at 0.4, 0.4 and 0.8 m of the filter bed, respectively, and the corresponding removal efficiencies were 90.82%, 95.48% and 95.90% in steady phase, respectively. The variation of microbial populations in the biofilter during start-up process was also investigated using high-throughput pyrosequencing (HTP). Results indicated that the main functional microbes for ammonia, iron and manganese removal were Nitrosomonas, Crenothrix and Crenothrix, respectively, which was mainly distributed at 0...
May 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28521086/a-computational-exploration-of-h2s-and-co2-capture-by-ionic-liquids-based-on-%C3%AE-amino-acid-anion-and-n7-n9-dimethyladeninium-cation
#7
Badrosadat Seyedhosseini, Mohammad Izadyar, Mohammad Reza Housaindokht
Hydrogen sulfide (H2S) and carbon dioxide (CO2) adsorption on a series of the aliphatic amino acid ionic liquids (AAILs) composed of N7,N9- dimethyladeninium cation with amino acid anions (AA= Gly, Ala, Val, Leu and Ile) as the functionalized ILs with dual groups of amine have been investigated. Based on the obtained data, the possible sites of H2S adsorption are twice as CO2 on the ionic liquids and also the average adsorption energy of H2S (∆E=-51.5 kJ.mol-1) in the most stable region of adsorption is twice greater than that of CO2 (∆E=-25...
May 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28513129/electrodeposited-nickel-cobalt-sulfide-catalyst-for-the-hydrogen-evolution-reaction
#8
Ahamed Irshad, Nookala Munichandraiah
A novel Ni-Co-S based material is prepared by potentiodynamic deposition from an aqueous solution containing Ni(2+), Co(2+) and thiourea, and is studied as an electrocatalyst for the hydrogen evolution reaction (HER) in neutral phosphate solution. The composition of the catalyst and HER activity are tuned by varying the ratio of concentrations of Ni(2+) and Co(2+) ions in the electrolytes. Under optimized deposition conditions, the bimetallic Ni-Co-S exhibits higher electrocatalytic activity than its monometallic counter parts...
May 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28512131/h2s-oxidation-by-nanodisc-embedded-human-sulfide-quinone-oxidoreductase
#9
Aaron P Landry, David P Ballou, Ruma Banerjee
Buildup of hydrogen sulfide (H2S), which functions as a signaling molecule but is toxic at high concentrations, is averted by its efficient oxidation by the mitochondrial sulfide oxidation pathway. The first step in this pathway is catalyzed by a flavoprotein, sulfide quinone oxidoreductase (SQR), which converts H2S to a persulfide and transfers electrons to coenzyme Q via a flavin cofactor. All previous studies on human SQR have used detergent-solubilized protein. Here, we embedded human SQR in nanodiscs (ndSQR) and studied highly homogenous preparations by steady-state and rapid kinetics techniques...
May 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28512115/endogenous-hydrogen-sulfide-enhances-carotid-sinus-baroreceptor-sensitivity-by-activating-the-transient-receptor-potential-cation-channel-subfamily-v-member-1-trpv1-channel
#10
Wen Yu, Ying Liao, Yaqian Huang, Selena Y Chen, Yan Sun, Chufan Sun, Yuming Wu, Chaoshu Tang, Junbao Du, Hongfang Jin
BACKGROUND: We aimed to investigate the regulatory effects of hydrogen sulfide (H2S) on carotid sinus baroreceptor sensitivity and its mechanisms. METHODS AND RESULTS: Male Wistar-Kyoto rats and spontaneously hypertensive rats (SHRs) were used in the experiment and were given an H2S donor or a cystathionine-β-synthase inhibitor, hydroxylamine, for 8 weeks. Systolic blood pressure and the cystathionine-β-synthase/H2S pathway in carotid sinus were detected. Carotid sinus baroreceptor sensitivity and the functional curve of the carotid baroreceptor were analyzed using the isolated carotid sinus perfusion technique...
May 16, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28510305/reactive-precipitation-of-anhydrous-alkali-sulfide-nanocrystals-with-concomitant-abatement-of-hydrogen-sulfide-and-co-generation-of-hydrogen
#11
Yongan Yang, Xuemin Li, Yangzhi Zhao, Alice Brennan, Miranda McCeig, Colin A Wolden
Anhydrous alkali sulfide (M2S, M = Li and Na) nanocrystals (NCs) are important materials central to the development of next generation cathodes and solid state electrolytes for advanced batteries, but not commercially available at present. This work reports an innovative method to directly synthesize M2S-NCs through alcohol-mediated reactions between alkali metals and hydrogen sulfide (H2S). In the first step, the alkali metal is complexed with alcohol in solution, forming metal alkoxide (ROM) and releasing hydrogen (H2)...
May 16, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28510292/enhanced-photoelectrochemical-activity-by-autologous-cd-cdo-cds-heterojunction-photoanode-with-high-conductivity-and-separation-efficiency
#12
Shilei Xie, Peng Zhang, Min Zhang, Peng Liu, Wei Li, Xihong Lu, Faliang Cheng, Yexiang Tong
The development of hydrogen from solar energy has attracted great attention due to the global demand for clean energy and environment. Herein, autologous Cd/CdO/CdS heterojunctions was prepared by carefully controlling process with the metallic Cd as the inner-layer and CdO as the interlayer. Further research revealed that the transportation and separation of photogenerated pairs were enhanced due to low resistance of Cd inner-layer and the type-II CdO/CdS heterojunction. As a result, the optimized Cd/CdO/CdS heterojunction photoanode showed outstanding and long-term photoelectrochemical activity for the water splitting, with the current density of 3...
May 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28507536/temporal-genomic-phylogeny-reconstruction-indicates-a-geospatial-transmission-path-of-salmonella-cerro-in-the-united-states-and-a-clade-specific-loss-of-hydrogen-sulfide-production
#13
Jasna Kovac, Kevin J Cummings, Lorraine D Rodriguez-Rivera, Laura M Carroll, Anil Thachil, Martin Wiedmann
Salmonella Cerro has become one of the most prevalent Salmonella serotypes isolated from dairy cattle in several U.S. states, including New York where it represented 36% of all Salmonella isolates of bovine origin in 2015. This serotype is commonly isolated from dairy cattle with clinical signs of salmonellosis, including diarrhea and fever, although it has also been identified in herds without evidence of clinical disease or decreased production. To better understand the transmission patterns and drivers of its geographic spread, we have studied the genomic similarity and microevolution of S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28505530/photocatalytic-wastewater-purification-with-simultaneous-hydrogen-production-using-mos2-qd-decorated-hierarchical-assembly-of-znin2s4-on-reduced-graphene-oxide-photocatalyst
#14
Shuqu Zhang, Longlu Wang, Chengbin Liu, Jinming Luo, John Crittenden, Xia Liu, Tao Cai, Jili Yuan, Yong Pei, Yutang Liu
It is attractive to photocatalytically purify wastewater and simultaneously convert solar energy into clean hydrogen energy. However, it is still a challenge owing to the relatively low photocatalytic efficiency of photocatalysts. In this study, we synthesized a molybdenum disulfide (MoS2) quantum dot-decorated 3D nanoarchitecture (MoS2QDs) of indium zinc sulfide (ZnIn2S4) and reduced grapheme oxide (MoS2QDs@ZnIn2S4@RGO) photocatalyst using a simple solvothermal method. The RGO promotes the electron transfer, and the highly dispersed MoS2QDs provides numerous catalytic sites...
May 10, 2017: Water Research
https://www.readbyqxmd.com/read/28503736/hydrogen-sulfide-pretreatment-improves-mitochondrial-function-in-myocardial-hypertrophy-via-a-sirt3-dependent-manner
#15
Guoliang Meng, Jieqiong Liu, Shangmin Liu, Qiuyi Song, Lulu Liu, Liping Xie, Yi Han, Yong Ji
BACKGROUND AND PURPOSE Hydrogen sulfide (H2 S) is a gaseous signal molecule with anti-oxidative ability. Sirtuin 3 (SIRT3) is closely associated with mitochondrial function and oxidative stress. The study was to investigate whether and how H2 S improved myocardial hypertrophy via a SIRT3-dependent manner. EXPERIMENTAL APPROACH Neonatal rat cardiomyocytes were pre-treated with NaHS (50 μM) for 4 h followed by angiotensin II (Ang II, 100 nM) for 24 h. SIRT3 was silenced with siRNA technology. SIRT 3 promoter activity and expression, cell surface, hypertrophic gene mRNA expression, mitochondrial oxygen consumption rate and membrane potential were measured...
May 15, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28501682/the-role-of-arachidonic-acid-cyclooxygenase-cascade-phosphodiesterase-iv-and-rho-kinase-in-h2s-induced-relaxation-in-the-mouse-corpus-cavernosum
#16
Fatma Aydinoglu, Nuran Ogulener
BACKGROUND: Penile corpus cavernosum is an extremely vascularized tissue and cavernosal smooth muscle tone is regulated by the balance between contractile and relaxant factor. We investigated the possible role of arachidonic acid/cyclooxygenase cascade, phosphodiesterase IV (PDEIV) and Rho-kinase in exogenous hydrogen sulfide (H2S)-induced relaxation in mouse corpus cavernosum. METHODS: The relaxant response to H2S (NaHS as exogenous H2S; 1-1000μM) were obtained in isolated mouse corpus cavernosum tissues which pre-contracted by phenylephrine (5μM)...
February 24, 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/28500947/electrochemical-latent-redox-ratiometric-probes-for-real-time-tracking-and-quantification-of-endogenous-hydrogen-sulfide-production-in-living-cells
#17
Kesavan Manibalan, Veerappan Mani, Pu-Chieh Chang, Chih-Hung Huang, Sheng-Tung Huang, Kasper Marchlewicz, Suresh Neethirajan
Hydrogen sulfide (H2S) was discovered as a third gasotransmitter in biological systems and recent years have seen a growing interest to understand its physiological and pathological functions. However, one major limiting factor is the lack of robust sensors to quantitatively track its production in real-time. We described a facile electrochemical assay based on latent redox probe approach for highly specific and sensitive quantification in living cells. Two chemical probes, Azido Benzyl ferrocene carbamate (ABFC) and N-alkyl Azido Benzyl ferrocene carbamate (NABFC) composed of azide trigger group were designed...
May 4, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28498298/hydrogen-sulfide-a-potential-novel-therapy-for-the-treatment-of-ischemia
#18
Amanda R Jensen, Natalie A Drucker, Sina Khaneki, Michael J Ferkowicz, Mervin C Yoder, Eric R DeLeon, Kenneth R Olson, Troy A Markel
Hydrogen sulfide (H2S) is a novel signaling molecule most recently found to be of fundamental importance in cellular function as a regulator of apoptosis, inflammation, and perfusion. Mechanisms of endogenous H2S signaling are poorly understood, however, signal transmission is thought to occur via persulfidation at reactive cysteine residues on proteins. Although much has been discovered about how H2S is synthesized in the body, less is known about how it is metabolized. Recent studies have discovered a multitude of different targets for H2S therapy, including those related to protein modification, intracellular signaling, and ion channel depolarization...
May 11, 2017: Shock
https://www.readbyqxmd.com/read/28493709/rh-duanphos-catalyzed-asymmetric-hydrogenation-of-%C3%AE-acetylamino-vinylsulfides-an-approach-to-chiral-%C3%AE-acetylamino-sulfides
#19
Wenchao Gao, Hui Lv, Xumu Zhang
Rh/DuanPhos-catalyzed asymmetric hydrogenation of challenging β-acetylamino vinylsulfides has been developed, affording chiral β-acetylamino sulfides with high yields and excellent ee's (up to 99% ee). This novel methodology provides an efficient and concise synthetic route to chiral β-acetylamino sulfides. The potential utility of this protocol in the synthesis of Apremilast has also been disclosed.
May 11, 2017: Organic Letters
https://www.readbyqxmd.com/read/28493181/assessment-of-hydrogen-sulfide-emission-from-a-sewage-treatment-plant-using-aermod
#20
Mahad Baawain, Abdullah Al-Mamun, Hamid Omidvarborna, Abdullah Al-Jabri
Air quality modeling plays an important role in prediction of air pollutants in urban areas. Moreover, it is also an essential component to make crucial decisions in environmental management. In this study, environmental protection agency (EPA) regulatory model (AERMOD) was implemented in order to assess the urban air quality in the city of Muscat, Sultanate of Oman. Dispersion modeling was employed for the prediction of hydrogen sulfide (H2S) emissions, a neighborhood claimed issue, from Al-Ansab sewage treatment plant (STP)...
June 2017: Environmental Monitoring and Assessment
keyword
keyword
7872
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"