keyword
MENU ▼
Read by QxMD icon Read
search

Hydrogen sulphide

keyword
https://www.readbyqxmd.com/read/28346391/hydrogen-sulphide-production-in-healthy-and-ulcerated-gastric-mucosa-of-rats
#1
Patrycja Bronowicka-Adamska, Maria Wróbel, Marcin Magierowski, Katarzyna Magierowska, Sławomir Kwiecień, Tomasz Brzozowski
Hydrogen sulphide (H₂S) is produced endogenously via two enzymes dependent on pyridoxal phosphate (PLP): cystathionine beta-synthase (CBS, EC 4.2.1.22), cystathionase γ-liase (CTH, EC 4.4.1.1), and a third, 3-mercaptopyruvate sulfurtransferase (MPST, EC 2.8.1.2). H₂S strengthens the defence mechanisms of the gastric mucosal barrier, and plays an important role in gastroprotection, including the increased resistance to damage caused by various irritants and non-steroidal anti-inflammatory drugs. The study was conducted to determine the role of H₂S in ulcerated gastric mucosa of rats caused by immobilization in cold water (WRS)...
March 27, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28251989/silver-nanoparticles-reduce-brain-inflammation-and-related-neurotoxicity-through-induction-of-h2s-synthesizing-enzymes
#2
Daniel A Gonzalez-Carter, Bey Fen Leo, Pakatip Ruenraroengsak, Shu Chen, Angela E Goode, Ioannis G Theodorou, Kian Fan Chung, Raffaella Carzaniga, Milo S P Shaffer, David T Dexter, Mary P Ryan, Alexandra E Porter
Silver nanoparticles (AgNP) are known to penetrate into the brain and cause neuronal death. However, there is a paucity in studies examining the effect of AgNP on the resident immune cells of the brain, microglia. Given microglia are implicated in neurodegenerative disorders such as Parkinson's disease (PD), it is important to examine how AgNPs affect microglial inflammation to fully assess AgNP neurotoxicity. In addition, understanding AgNP processing by microglia will allow better prediction of their long term bioreactivity...
March 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28244881/oral-or-nasal-breathing-real-time-effects-of-switching-sampling-route-onto-exhaled-voc-concentrations
#3
Pritam Sukul, Peter Oertel, Svend Kamysek, Phillip Trefz
There is a need for standardisation in sampling and analysis of breath volatile organic compounds (VOCs) in order to minimise ubiquitous confounding effects. Physiological factors may mask concentration changes induced by pathophysiological effects. In humans, unconscious switching of oral and nasal breathing can occur during breath sampling, which may affect VOC patterns. Here, we investigated exhaled VOC concentrations in real-time while switching breathing routes. Breath from 15 healthy volunteers was analysed continuously by proton transfer reaction time-of-flight mass spectrometry during paced breathing (12 breaths min(-1))...
March 21, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28185540/medicinal-chemistry-approaches-of-controlling-gastrointestinal-side-effects-of-non-steroidal-anti-inflammatory-drugs-endogenous-protective-mechanisms-and-drug-design
#4
Paraskevi Tziona, Panagiotis Theodosis-Nobelos, Eleni A Rekka
BACKGROUND: Non steroidal anti-inflammatory drugs are of the oldest and most widely used medicines. However, their untoward effects, especially gastrointestinal toxicity, remain the main obstacle to their application. Because of their mechanism of action, cycloxygenase (COX) inhibition, in combination with the weekly acidic character of most of them, major protective mechanisms of the gastrointestinal system are suppressed and deregulated. OBJECTIVE: In this review, several compounds designed to retain anti-inflammatory activity, but devoid of gastrointestinal side effects, are presented...
February 9, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/28150299/role-of-pvat-on-coronary-atherosclerosis-and-vein-graft-patency-friend-or-foe
#5
REVIEW
M S Fernández Alfonso, M Gil-Ortega, I Aranguez, D Souza, M Dreifaldt, B Somoza, M R Dashwood
Perivascular adipose tissue (PVAT) releases multiple factors and adipokines with paracrine effects on both vascular structure and function. This influence is variable depending on regional differences in PVAT among blood vessels and with changes in adiposity. Considerable evidence demonstrates the association between coronary PVAT and the development and progression of coronary artery disease, associated with inflammation, oxidative stress, angiogenesis, vascular remodeling and blood clotting. However, PVAT also has a protective role on vascular grafts, especially the no-touch saphenous vein, in patients undergoing coronary artery bypass...
February 1, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28070795/td-dft-study-of-absorption-and-emission-spectra-of-2-2-aminophenyl-benzothiazole-derivatives-in-water
#6
Natthaporn Manojai, Rathawat Daengngern, Khanittha Kerdpol, Nawee Kungwan, Chanisorn Ngaojampa
Reduction of aromatic azides to amines is an important property of hydrogen sulphide (H2S) which is useful in fluorescence microscopy and H2S probing in cells. The aim of this work is to study the substituent effect on the absorption and emission spectra of 2-(2'-aminophenyl)benzothiazole (APBT) in order to design APBT derivatives for the use of H2S detection. Absorption and emission spectra of APBT derivatives in aqueous environment were calculated using density functional theory (DFT) and time-dependent DFT (TD-DFT) at B3LYP/6-311+G(d,p) level...
January 9, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/27983540/plasma-nitric-oxide-level-is-correlated-with-microvascular-functions-in-the-peripheral-arterial-disease
#7
Muzaffer Akkoca, Suzan Emel Usanmaz, Cuneyt Koksoy, Ugur Bengisun, Emine Demirel-Yilmaz
At present there is no widely accepted biomarker for monitoring of vascular functions. The purpose of this prospective study was to investigate the association of some blood biomarkers with vascular reactivity in patients with peripheral arterial diseases (PAD). A prospective evaluation was made of 3 groups comprising a control group of healthy individuals, and patients with PAD caused by either atherosclerosis or Buerger's disease. Microvascular perfusion was examined using laser Doppler imaging of cutaneous erythrocyte flux after iontophoresis of acetylcholine (ACh) and sodium nitroprusside (SNP)...
2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27929450/disposable-paper-based-inkjet-printed-humidity-and-h%C3%A2-s-gas-sensor-for-passive-sensing-applications
#8
Abdul Quddious, Shuai Yang, Munawar M Khan, Farooq A Tahir, Atif Shamim, Khaled N Salama, Hammad M Cheema
An inkjet-printed, fully passive sensor capable of either humidity or gas sensing is presented herein. The sensor is composed of an interdigitated electrode, a customized printable gas sensitive ink and a specialized dipole antenna for wireless sensing. The interdigitated electrode printed on a paper substrate provides the base conductivity that varies during the sensing process. Aided by the porous nature of the substrate, a change in relative humidity from 18% to 88% decreases the electrode resistance from a few Mega-ohms to the kilo-ohm range...
December 6, 2016: Sensors
https://www.readbyqxmd.com/read/27910968/designing-hierarchical-hollow-nanostructures-of-cu2mos4-for-improved-hydrogen-evolution-reaction
#9
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 21, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27873232/evidence-based-revised-view-of-the-pathophysiology-of-preeclampsia
#10
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
#11
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...
November 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
#12
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
#13
REVIEW
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
#14
REVIEW
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
#15
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...
January 2017: 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
#16
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/modelling-gas-generation-for-landfill
#17
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...
September 27, 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
#18
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
#19
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
#20
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
keyword
keyword
38611
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"