keyword
MENU ▼
Read by QxMD icon Read
search

hydrogen production

keyword
https://www.readbyqxmd.com/read/27915245/the-yeast-tum1-affects-production-of-hydrogen-sulfide-from-cysteine-treatment-during-fermentation
#1
Chien-Wei Huang, Michelle Walker, Bruno Fedrizzi, Miguel Roncoroni, Richard Gardner, Vladimir Jiranek
The undesirable rotten-egg odour of hydrogen sulfide (H2S) produced by yeast shortly after yeast inoculation of grape musts, might be an important source of desirable varietal thiols, which contribute to tropical aromas in varieties such as Sauvignon Blanc. In this study, we observed that Saccharomyces cerevisiae strains produce an early burst of H2S from cysteine. Both Δmet2 and Δmet17 strains produce a larger burst, likely because they are unable to utilise the H2S in the sulfate assimilation pathway. For the first time, we show that TUM1 is partly responsible for the early production of H2S from cysteine...
December 2, 2016: FEMS Yeast Research
https://www.readbyqxmd.com/read/27915195/hydrogen-deuterium-exchange-a-unique-and-effective-method-for-ms-fragmentation-behavior-elucidation-of-ginkgolides-and-its-application-to-systematic-research-in-ginkgo-biloba
#2
Xingliang Niu, Jun Luo, Deran Xu, Hongyan Zou, Lingyi Kong
Ginkgolides, the main active constituents of Ginkgo biloba, possess significant selectively inhibition on platelet-activating factor and pancreatic lipase and attract wide attention in pharmacological research area. In our study, an effective hydrogen/deuterium (H/D) exchange method was developed by exchanging the α-Hs of lactone groups in ginkgolides with Ds, which was very useful for the elucidation of the fragmentation patterns of ginkgolides in Quadrupole Time-of-flight Mass Spectrometry (Q-TOF-MS), especially in accurately distinguishing the type and position of substituent in framework of ginkgolides...
November 26, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/27912196/nox-isoforms-in-the-development-of-abdominal-aortic-aneurysm
#3
Kin Lung Siu, Qiang Li, Yixuan Zhang, Jun Guo, Ji Youn Youn, Jie Du, Hua Cai
Oxidative stress plays an important role in the formation of abdominal aortic aneurysm (AAA), and we have recently established a causal role of uncoupled eNOS in this severe human disease. We have also shown that activation of NADPH oxidase (NOX) lies upstream of uncoupled eNOS. Therefore, identification of the specific NOX isoforms that are required for eNOS uncoupling and AAA formation would ultimately lead to novel therapies for AAA. In the present study, we used the Ang II infused hph-1 mice to examine the roles of NOX isoforms in the development of AAA...
November 19, 2016: Redox Biology
https://www.readbyqxmd.com/read/27911258/clostridium-guangxiense-sp-nov-and-clostridium-neuense-sp-nov-two-phylogenetically-closely-related-hydrogen-producing-species-isolated-from-lake-sediment
#4
Xin Zhao, Danyang Li, Shuhong Xu, Zhanghao Guo, Yan Zhang, Lin Man, Binhui Jiang, Xiaomin Hu
Two novel anaerobic, mesophilic, bio-hydrogen producing bacteria, designated strains ZGM211T and G1T, were isolated from lake sediment. 16S rRNA and ATP synthase beta subunit (atpD) gene sequences phylogenetic analysis of strains ZGM211T and G1T revealed an affiliation to the genus Clostridium sensu stricto (cluster I of the clostridia), with Clostridium acetobutylicum as the closest characterized species, showing the same sequence similarity of 96.4% to the type strain (98.9% between the two isolates). Cells of the two strains were rod-shaped...
December 1, 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27910937/biohydrogen-production-from-enzymatic-hydrolysis-of-food-waste-in-batch-and-continuous-systems
#5
Wei Han, Yingting Yan, Yiwen Shi, Jingjing Gu, Junhong Tang, Hongting Zhao
In this study, the feasibility of biohydrogen production from enzymatic hydrolysis of food waste was investigated. Food waste (solid-to-liquid ratio of 10%, w/v) was first hydrolyzed by commercial glucoamylase to release glucose (24.35 g/L) in the food waste hydrolysate. Then, the obtained food waste hydrolysate was used as substrate for biohydrogen production in the batch and continuous (continuous stirred tank reactor, CSTR) systems. It was observed that the maximum cumulative hydrogen production of 5850 mL was achieved with a yield of 245...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910898/hydrogen-overproducing-nitrogenases-obtained-by-random-mutagenesis-and-high-throughput-screening
#6
Emma Barahona, Emilio Jiménez-Vicente, Luis M Rubio
When produced biologically, especially by photosynthetic organisms, hydrogen gas (H2) is arguably the cleanest fuel available. An important limitation to the discovery or synthesis of better H2-producing enzymes is the absence of methods for the high-throughput screening of H2 production in biological systems. Here, we re-engineered the natural H2 sensing system of Rhodobacter capsulatus to direct the emission of LacZ-dependent fluorescence in response to nitrogenase-produced H2. A lacZ gene was placed under the control of the hupA H2-inducible promoter in a strain lacking the uptake hydrogenase and the nifH nitrogenase gene...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910578/liquid-phase-catalytic-reactor-combined-with-measurement-of-hot-electron-flux-and-chemiluminescence
#7
Ievgen I Nedrygailov, Changhwan Lee, Song Yi Moon, Hyosun Lee, Jeong Young Park
Understanding the role of electronically nonadiabatic interactions during chemical reactions on metal surfaces in liquid media is of great importance for a variety of applications including catalysis, electrochemistry, and environmental science. Here, we report the design of an experimental apparatus for detection of the highly excited (hot) electrons created as a result of nonadiabatic energy transfer during the catalytic decomposition of hydrogen peroxide on thin-film metal-semiconductor nanodiodes. The apparatus enables the measurement of hot electron flows and related phenomena (e...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27909733/nitrogen-gas-plasma-treatment-of-bacterial-spores-induces-oxidative-stress-that-damages-the-genomic-dna
#8
Akikazu Sakudo, Yoichi Toyokawa, Tetsuji Nakamura, Yoshihito Yagyu, Yuichiro Imanishi
Gas plasma, produced by a short high‑voltage pulse generated from a static induction thyristor power supply [1.5 kilo pulse/sec (kpps)], was demonstrated to inactivate Geobacillus stearothermophilus spores (decimal reduction time at 15 min, 2.48 min). Quantitative polymerase chain reaction and enzyme‑linked immunosorbent assays further indicated that nitrogen gas plasma treatment for 15 min decreased the level of intact genomic DNA and increased the level of 8-hydroxy-2'-deoxyguanosine, a major product of DNA oxidation...
November 29, 2016: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27908715/development-and-characterization-of-bacterial-cellulose-reinforced-biocomposite-films-based-on-protein-from-buckwheat-distiller-s-dried-grains
#9
Xuejiao Wang, Niamat Ullah, Xuchun Sun, Yan Guo, Lin Chen, Zhixi Li, Xianchao Feng
Biocomposite films were manufactured by combining protein extracted from buckwheat distiller's dried grains with bacterial cellulose (BC). The film microstructures showed that BC is compatible with protein matrix and endows the film with high rigidity. Differential scanning calorimetry (DSC) showed that BC can promote thermal stability of the composite films. BC promoted the transition from a Newtonian to a non-Newtonian fluid and the shear thinning behavior of protein-BC solution. Fourier Transform Infrared (FTIR) spectroscopy showed the main functional groups' absorption peaks shifted to lower wavenumbers...
November 28, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27908111/nuclear-quantum-effects-in-a-hiv-cancer-inhibitor-the-case-of-ellipticine
#10
Subrahmanyam Sappati, Ali Hassanali, Ralph Gebauer, Prasenjit Ghosh
Ellipticine is a natural product that is currently being actively investigated for its inhibitory cancer and HIV properties. Here we use path-integral molecular dynamics coupled with excited state calculations to characterize the role of nuclear quantum effects on the structural and electronic properties of ellipticine in water, a common biological solvent. Quantum effects collectively enhance the fluctuations of both light and heavy nuclei of the covalent and hydrogen bonds in ellipticine. In particular, for the ellipticine-water system, where the proton donor and acceptor have different proton affinities, we find that nuclear quantum effects (NQEs) strengthen both the strong and the weak H bonds...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27905505/surface-protonics-promotes-catalysis
#11
R Manabe, S Okada, R Inagaki, K Oshima, S Ogo, Y Sekine
Catalytic steam reforming of methane for hydrogen production proceeds even at 473 K over 1 wt% Pd/CeO2 catalyst in an electric field, thanks to the surface protonics. Kinetic analyses demonstrated the synergetic effect between catalytic reaction and electric field, revealing strengthened water pressure dependence of the reaction rate when applying an electric field, with one-third the apparent activation energy at the lower reaction temperature range. Operando-IR measurements revealed that proton conduction via adsorbed water on the catalyst surface occurred during electric field application...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27904388/content-of-total-phenolics-flavan-3-ols-and-proanthocyanidins-oxidative-stability-and-antioxidant-capacity-of-chocolate-during-storage
#12
Jovanka Laličić-Petronijević, Draženka Komes, Stanislava Gorjanović, Ana Belščak-Cvitanović, Lato Pezo, Ferenc Pastor, Sanja Ostojić, Jovanka Popov-Raljić, Desanka Sužnjević
Antioxidant (AO) capacity of chocolates with 27, 44 and 75% cocoa was assessed after production and during twelve months of storage by direct current (DC) polarographic assay, based on the decrease of anodic current caused by the formation of hydroxo-perhydroxyl mercury(II) complex (HPMC) in alkaline solutions of hydrogen peroxide at potentials of mercury oxidation, and two spectrophotometric assays. Relative antioxidant capacity index (RACI) was calculated by taking the average value of the AO assay (the sample mass in all assays was identical)...
March 2016: Food Technology and Biotechnology
https://www.readbyqxmd.com/read/27904096/development-and-analysis-of-novel-therapeutic-targets-to-improve-pancreatic-%C3%AE-cell-function-in-type-2-diabetes
#13
Yukiko K Kaneko
 Pancreatic β-cell dysfunction is a major feature of type 2 diabetes. Therefore maintenance of β-cell function is essential to preventing the onset and progression of type 2 diabetes. To elucidate the mechanisms underlying the regulation of insulin secretion and β-cell survival, we particularly focused on the roles of gasotransmitters in pancreatic β-cells. Nitric oxide (NO) and hydrogen sulfide (H2S) are recognized as toxic gases. However, they are also vital physiological and pathophysiological mediators in various cell types...
2016: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/27904035/reduced-production-of-hydrogen-sulfide-and-sulfane-sulfur-due-to-low-cystathionine-%C3%AE-synthase-levels-in-brain-astrocytes-of-stroke-prone-spontaneously-hypertensive-rats
#14
Sachiko Juman, Yasuo Nara, Naomi Yasui, Hiroko Negishi, Hiroto Okuda, Nichika Takado, Tomohiro Miki
Stroke-prone spontaneously hypertensive rats (SHRSP/Izm; SHRSP) develop severe hypertension and die of cerebral stroke. However, the genetic mechanisms underlying their stroke susceptibility have not been clarified yet. In this study, we used astrocytes from the newborn brain cortex of spontaneously hypertensive rats (SHR/Izm; SHR) and SHRSP to find the difference of genetic characteristics. Astrocytes are known to have functions of vasodilation and nutrient uptake for neurons in the brain. The continuous generation of hydrogen peroxide (H2O2) dose-dependently causes cell death in astrocytes, and SHRSP was more vulnerable than SHR...
2016: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/27903652/prepore-stability-controls-productive-folding-of-the-bam-independent-multimeric-outer-membrane-secretin-puld
#15
Ingrid Guilvout, Sébastien Brier, Mohamed Chami, Véronique Hourdel, Olivera Francetic, Anthony P Pugsley, Julia Chamot-Rooke, Gerard H M Huysmans
Members of a group of multimeric secretion pores that assemble independently of any known membrane-embedded insertase in Gram-negative bacteria fold into a prepore before membrane-insertion occurs. The mechanisms and the energetics that drive the folding of these proteins are poorly understood. Here, equilibrium unfolding and hydrogen/deuterium exchange monitored by mass spectrometry indicated that a loss of 4-5 kJ/mol/protomer in the N3-domain that is peripheral to the membrane-spanning C-domain in the dodecameric secretin PulD, the founding member of this class, prevents pore formation by destabilizing the prepore into a poorly structured dodecamer as visualized by electron microscopy...
November 30, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27903457/glass-forming-ability-of-compounds-in-marketed-amorphous-drug-products
#16
Nicole Wyttenbach, Martin Kuentz
This note is about the glass-forming ability (GFA) of drugs marketed as amorphous solid dispersions or as pure amorphous compounds. A thermoanalytical method was complemented with an in silico study, which made use of molecular properties that were identified earlier as being relevant for GFA. Thus, molar volume together with effective numbers of torsional bonds and hydrogen bonding were used to map drugs that are as amorphous products on the market either as solid dispersion of without co-processed carrier as amorphous drug in a solid dosage form...
November 27, 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27903429/polyhydroxyalkanoate-as-a-slow-release-carbon-source-for-in-situ-bioremediation-of-contaminated-aquifers-from-laboratory-investigation-to-pilot-scale-testing-in-the-field
#17
Lucia Pierro, Bruna Matturro, Simona Rossetti, Marco Sagliaschi, Salvatore Sucato, Eduard Alesi, Ernst Bartsch, Firoozeh Arjmand, Marco Petrangeli Papini
A pilot-scale study aiming to evaluate the potential use of poly-3-hydroxy-butyrate (PHB) as an electron donor source for in situ bioremediation of chlorinated hydrocarbons in groundwater was conducted. Compared with commercially available electron donors, PHB offers a restricted fermentation pathway (i.e., through acetic acid and molecular hydrogen) by avoiding the formation of any residual carbon that could potentially spoil groundwater quality. The pilot study was carried out at an industrial site in Italy, heavily contaminated by different chlorinated aliphatic hydrocarbons (CAHs)...
November 26, 2016: New Biotechnology
https://www.readbyqxmd.com/read/27902876/asymmetric-synthesis-of-optically-active-spirocyclic-indoline-scaffolds-applying-an-enantioselective-reduction-of-3h-indoles
#18
Magnus Rueping
An enantioselective synthesis of spirocyclic indoline scaffolds was achieved by applying an asymmetric iridium catalyzed hydrogenation of 3H-indoles. Low catalyst loadings and mild reaction conditions provide a broad range of differently substituted products with excellent yields and enantioselectivities. The developed methodology allows an efficient synthesis of this important spirocyclic structural motif, which is present in numerous biologically active molecules and privileged structures in medicinal chemistry...
November 30, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27902861/thioaldehydes-from-aldehyde-hydrogen-sulfide-interaction-under-organocatalysis
#19
Joseph S Francisco, Manoj Kumar
Thioaldehydes are an important class of sulfur compounds involved in atmospheric, synthetic organic and biological chemistry. Traditionally, they are believed to be formed by the nucleophilic attack of bisulfide anion on the carbonyl compounds. Herein we suggest a novel mechanism that does not require the formation of bisulfide anion, but rather involves an interaction between hydrogen sulfide and an aldehyde. Though the uncatalyzed or the water-catalyzed reactions involve high barriers, the formic acid-catalyzed reactions involve moderate barriers that should be accessible in planetary atmospheres...
November 30, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27902845/cloning-and-heterologous-expression-of-chlorophyll-a-synthase-in-rhodobacter-sphaeroides
#20
Emre M Ipekoğlu, Koray Göçmen, Mehmet T Öz, Muazzez Gürgan, Meral Yücel
Rhodobacter sphaeroides is a purple non-sulfur bacterium which photoheterotrophically produces hydrogen from organic acids under anaerobic conditions. A gene coding for putative chlorophyll a synthase (chlG) from cyanobacterium Prochlorococcus marinus was amplified by nested polymerase chain reaction and cloned into an inducible-expression plasmid which was subsequently transferred to R. sphaeroides for heterologous expression. Induced expression of chlG in R. sphaeroides led to changes in light absorption spectrum within 400-700 nm...
November 30, 2016: Journal of Basic Microbiology
keyword
keyword
58627
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"