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Hydrogen (0):
Recent article
Hydrogen
Abstract
Two new crystal structures, calcium bis(hydrogen methylphosphonate), Ca(CH(3)PO(3)H)(2), and lithium hydrogen methylphosphonate, Li(CH(3)PO(3)H), have been obtained, and the experimental and theoretical charge densities, as well as their topological properties, are reported. Both compounds display la...
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PMID: 21931209
PDF is available here.
PDF is available here.
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Abstract
Abstract
We show here that the symbionts of the hydrothermal vent mussel Bathymodiolus from the Mid-Atlantic Ridge use hydrogen to power primary production. In addition, we show that the symbionts of Bathymodiolus mussels from Pacific vents have hupL, the key gene for hydrogen oxidation. Furthermore, the sym...
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PMID: 21833083
PDF is available here.
PDF is available here.
ISME Journal (5)7 2011
Abstract
We explored the interactions of two spirochetes previously isolated from the very same termite species. As hydrogen (H(2)) is the central free intermediate in termite-gut lignocellulose digestion, we focused on interactions between two closely related termite-gut spirochetes possessing complementary...
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PMID: 21326336
PDF is available here.
PDF is available here.
Abstract
We show that hepatic glycogen accumulates H(2) after oral administration of H(2)-water, explaining why consumption of even a small amount of H(2) over a short span time efficiently improves various disease models. This finding was supported by an in vitro experiment in which glycogen solution mainta...
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PMID: 21293445
PDF is available here.
PDF is available here.
Brain research (1378) 2011
Abstract
We found that I/R-challenged animals showed significant spinal cord damage characterized by the decreased numbers of normal motor neurons and hind-limb motor dysfunction, which was significantly improved by 2% and 4 % H₂ treatment. Furthermore, we found that the beneficial effects of H₂ treatmen...
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PMID: 21195696
PDF is available here.
PDF is available here.
Nature Chemistry (3)2 2011
Abstract
We present here the first catalytic conversion of n-alkanes to alkylaromatics using homogeneous or molecular catalysts--specifically 'pincer'-ligated iridium complexes--and olefinic hydrogen acceptors. For example, the reaction of n-octane affords up to 86% yield of aromatic product, primarily o-xyl...
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PMID: 21258391
PDF is available here.
PDF is available here.
British Journal of Nutrition (105)1 2011
Abstract
We evaluated the absorption and metabolism of palatinose in rats by the carbohydrate load test and the 13C- and H2-breath tests. We compared the results of these tests with those of sucrose, since sucrose is an isomer of palatinose and generally known to be degraded and absorbed from the small intes...
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PMID: 20807468
PDF is available here.
PDF is available here.
Abstract
The inductively coupled low-pressure plasma technique can achieve fast and efficient sterilization of silicone implant material without adverse materials effects. All four gas mixtures led to a significant spore reduction, and no structural damage to the implant material could be observed....
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PMID: 21322816
PDF is available here.
PDF is available here.
Molecular Biology Reports (36 Suppl 1) 2010
Abstract
Abstract
(Spectro-)electrochemical results demonstrate ligand-centred hydride ion-carrier capacity for a Rh(I) complex of a novel 'non-innocent' N-heterocyclic carbene ligand created by nicotinamide functionalisation.
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PMID: 20922240
PDF is available here.
PDF is available here.
Bioresource Technology (101)23 2010
Abstract
High purity hydrogen (>95%) was produced at 600 degrees C and 1 atm by steam reforming of waste cooking oil at a molar steam to carbon ratio of 4 using chemical looping, a process that features redox cycles of a Ni catalyst with the in-situ carbonation/calcination of a CO(2) sorbent (dolomite) in a...
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PMID: 20655199
PDF is available here.
PDF is available here.
Abstract
Abstract
A new synthetic methodology for the catalytic C-H functionalisation of 2-pyrones is described which proceeds regioselectively at the C3 position, mirroring the observed regioselectivity in 6π-electrocyclisation/oxidative aromatisation reactions of related compounds. Insight into the reaction mechan...
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PMID: 20944842
PDF is available here.
PDF is available here.
Abstract
Stereoselective catalytic intermolecular C-H amination of complex molecules is reported. Site-selective functionalizations occur with very good yields up to 91% and excellent d.e.s up to 99%. However, the precise nature of the nitrene C-H insertion remains a matter of debate despite several physical...
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PMID: 20931128
PDF is available here.
PDF is available here.
Abstract
The solvent-free, palladium-catalysed reaction of anilides with CuCl(2) in the presence or absence of copper acetate yields ortho-chlorinated anilides in good to excellent yields, even on a large scale (100 mmol). By contrast, the equivalent reactions with copper bromide, either solvent free or in 1...
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PMID: 20931130
PDF is available here.
PDF is available here.
Chemical Communications (46)42 2010
Abstract
An in situ coupled oxidation cycle that allows catalytic oxidation of a substrate with catalytic amounts of o-chloranil and novel reusable polymer-immobilized platinum nanocluster catalysts using molecular oxygen as the terminal oxidant was developed.
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PMID: 20871889
PDF is available here.
PDF is available here.
Abstract
We also report an updated G2(MP2) proton affinity of tryptophan (PA = 946 kJ mol(-1)) and hydrogen atom affinities of the tryptophan indole ring of relevance to electron-based peptide dissociations....
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PMID: 20830385
PDF is available here.
PDF is available here.
Abstract
This article analyses the mechanisms of inelastic and reactive H + D(2)(v = 0, j = 2) collisions that result in highly vibrationally excited products when the collision energy is 1.70 eV. The analytical method is entirely quantum mechanical and focuses on correlations between the polarization of the...
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PMID: 20852814
PDF is available here.
PDF is available here.
Abstract
Density functional theory calculations are performed to explore vacancy-induced magnetism in graphene. The hydrogen saturation not only stabilizes the vacancy structure but also induces distinct magnetic coupling depending on the defect distribution: weak magnetic coupling between defects on differe...
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PMID: 20852802
PDF is available here.
PDF is available here.
Abstract
These results demonstrate the potential utility of HDX to probe conformational and dynamical changes within non-covalently bound protein-ligand complexes which are of widespread importance in many biomolecular systems....
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PMID: 20877857
PDF is available here.
PDF is available here.
Journal of Biological Chemistry (285)45 2010
Abstract
Our current study demonstrates that activation of NHE-1 (Na(+)/H(+) exchanger isoform 1) in dendrites presents a major pathway for Na(+) overload. Neuronal dendrites exhibited higher pH(i) regulation rates than soma as a result of a larger surface area/volume ratio. Following a 2-h oxygen glucose de...
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PMID: 20817726
PDF is available here.
PDF is available here.
Pediatric Research (68)5 2010
Abstract
We examined whether 2.1% H2-supplemented room air (H2-RA) ventilation would preserve cerebrovascular reactivity (CR) and brain morphology after asphyxia/reventilation (A/R) in newborn pigs. Anesthetized, ventilated piglets were assigned to one of the following groups: A/R with RA or H2-RA ventilatio...
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PMID: 20657346
PDF is available here.
PDF is available here.
Chemical Communications (46)40 2010
Abstract
We report the synthesis of highly active NiS/CdS photocatalysts via a simple hydrothermal loading method for H(2) evolution from lactic acid sacrificial solution under visible light. In the absence of noble metals, a high quantum efficiency of 51.3% was measured at 420 nm.
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PMID: 20848040
PDF is available here.
PDF is available here.
Abstract
The effective removal of nitrogen compounds from wastewater has become a critical issue for treatment plants as the awareness of their negative impact on the environment increased. Autotrophic nitrogen removal has become an interesting alternative to the more conventional heterotrophic processes, as...
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PMID: 21121462
PDF is available here.
PDF is available here.
Abstract
The extent to which deuterium can act as a protecting group to prevent unwanted 1,5-hydrogen atom transfer to aryl and vinyl radical intermediates was examined in the context of the generation of α-aminoalkyl radicals in a pyrrolidine ring. Intra- and intermolecular radical trapping following hydro...
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PMID: 20714669
PDF is available here.
PDF is available here.
Journal of Biological Chemistry (285)42 2010
Abstract
We utilize amide hydrogen exchange measurements to probe the organization of the peptide in its fibrillar form. We determined the extent of hydrogen exchange first by tandem proteolysis, liquid chromatography, and mass spectrometry (HXMS) and then by exchange-quenched NMR. Although single amide reso...
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PMID: 20679344
PDF is available here.
PDF is available here.
British Journal of Cancer (103)8 2010
Abstract
Human medulloblastomas exhibit diverse molecular pathology. Aberrant hedgehog signalling is found in 20-30% of human medulloblastomas with largely unknown metabolic consequences.
Transgenic mice over-expressing smoothened (SMO) receptor in granule cell precursors with high incidence of exophytic med...
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PMID: 20842126
PDF is available here.
PDF is available here.
Abstract
We report here the (1)H, (15)N and (13)C assignments for the reduced form of a thiol-disulphide oxidoreductase from the Antarctic bacterium Pseudoalteromonas haloplanktis TAC125....
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PMID: 20455034
PDF is available here.
PDF is available here.
Brain research (1354) 2010
Abstract
We have found that H(2) inhalation significantly improved the survival rate and organ damage of septic mice. In the present study, we investigated the effectiveness of H(2) therapy on brain edema, blood-brain barrier (BBB) breakdown, neurological dysfunction and injury volume in TBI-challenged rats....
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PMID: 20654594
PDF is available here.
PDF is available here.
Scientific American (303)4 2010
Abstract
Abstract
Astrocytes are often referred to, and historically have been regarded as, support cells of the mammalian CNS. Work over the last decade suggests otherwise-that astrocytes may in fact play a more active role in higher neural processing than previously recognized. Because astrocytes can potentially se...
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PMID: 20880499
PDF is available here.
PDF is available here.
Abstract
Quantum chemical calculations have been performed on the complexes formed between HArF and dihalogen molecules (XY=ClCl, ClF, BrCl, and BrF) at the MP2/6-311++G(2d,2p) level. For each complex, two minima were found, which correspond to one hydrogen-bonded complex and one halogen-bonded complex. The...
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PMID: 20634128
PDF is available here.
PDF is available here.
Abstract
We present a simple method, ARTSY, for extracting ¹J(NH) couplings and ¹H-¹⁵N RDCs from an interleaved set of two-dimensional ¹H-¹⁵N TROSY-HSQC spectra, based on the principle of quantitative J correlation. The primary advantage of the ARTSY method over other methods is the ability to measu...
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PMID: 20694505
PDF is available here.
PDF is available here.
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment and General Theory (114)37 2010
Abstract
We find that the dissociation of (H(2)O)(2)H(+) and (D(2)O)(2)D(+) exhibits a distinct threshold behavior due to the existence of activation energies. Moreover, the deviation between the harmonic and anharmonic dissociation rate constants becomes larger in the high energy or temperature range, with...
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PMID: 20722362
PDF is available here.
PDF is available here.
Abstract
We chose an exploratory target molecule, for which a successful transfer of PHIP had already been attested. The transfer of hyperpolarization to (19)F was further optimized by adequate field manipulations below Earth's magnetic field. This technique, called field cycling, led to a signal enhancement...
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PMID: 20614054
PDF is available here.
PDF is available here.
Abstract
The room-temperature hydrogen uptake of unbridged and bridged composites formed by a physical mixture of either (IRMOF-1)-(AC/Pt catalyst) or (IRMOF-1)-(AC/Pt catalyst) and sucrose, respectively, has been carefully measured and compared with previous results reported by Li and Yang. Contrary to thei...
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PMID: 20601991
PDF is available here.
PDF is available here.
Kidney International (78)10 2010
Abstract
Abstract
These results demonstrated the potential application of radiochromic films for passive 2D neutron dosimetry....
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PMID: 20693612
PDF is available here.
PDF is available here.
Optics Express (18)18 2010
Abstract
We demonstrate in situ and real time characterization of two-photon polymerization (TPP) by means of broadband coherent anti-Stokes Raman scattering (CARS) microscopy. The same experimental setup based on one femtosecond oscillator is used to perform both TPP and broadband CARS microscopy. We perfor...
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PMID: 20940818
PDF is available here.
PDF is available here.
Chemical Communications (46)32 2010
Abstract
The structural mimic of the active site of NiFe hydrogenases, [Ni(xbsms)FeCp(CO)](BF(4)), is an electrocatalyst for hydrogen evolution from trifluoroacetic acid in DMF.
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PMID: 20625582
PDF is available here.
PDF is available here.
Abstract
We unravel the mechanism of ionisation/dissociation control in the prototypical H(2) molecule. We track the excited state molecular dynamics from the moment of interaction with the laser field to ionization and dissociation, and determine how sequences of carefully tuned laser pulses are able to cha...
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PMID: 20532353
PDF is available here.
PDF is available here.
Abstract
I have tried to give the reader a panoramic set of applications, from the simple H-exchange reaction all the way to alkane hydroxylation by cytochrome P450 (Prog. Phys. Org. Chem. 1985, 15, 197; Angew. Chem., Int. Ed., 1999, 38, 586)....
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PMID: 20574583
PDF is available here.
PDF is available here.
Abstract
We describe a new method to correct and validate protein chemical shift values in relation to their 3D structure coordinates. This method classifies atoms using two parameters: the per-atom solvent accessible surface area (as calculated from the coordinates) and the secondary structure of the parent...
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PMID: 20602353
PDF is available here.
PDF is available here.
Revista de Neurologia (51)4 2010
Abstract
Huntington's disease is an hereditary autosomic-dominant neurodegenerative disorder, characterized by motor, cognitive and psychiatric symptoms.
To quantify differences in N-acetylaspartate, creatine and choline in caudate nucleus, putamen and occipital cortex of patients with Huntington's disease,...
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PMID: 20648464
PDF is available here.
PDF is available here.
Abstract
Vanadium nitrogenase not only reduces dinitrogen to ammonia but also reduces carbon monoxide to ethylene, ethane, and propane. The parallelism between the two reactions suggests a potential link in mechanism and evolution between the carbon and nitrogen cycles on Earth.
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PMID: 20689010
PDF is available here.
PDF is available here.
Abstract
Gas pressure influences the regioselectivity and enantioselectivity of aryl alkene hydroformylation as catalyzed by rhodium complexes of the BisDiazaphos ligand. Deuterioformylation of styrene at 80 degrees C results in extensive deuterium incorporation into the terminal position of the recovered st...
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PMID: 20662513
PDF is available here.
PDF is available here.
Abstract
The internal hydrostatic pressure (turgor) of the filamentous fungus Neurospora crassa is regulated at about 400-500 kiloPascals, primarily by an osmotic MAP kinase cascade which activates ion uptake from the extracellular medium and glycerol synthesis. In the absence of hyperosmotic stress, the phe...
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PMID: 20546911
PDF is available here.
PDF is available here.
Abstract
During the nitrogen-fixing process, ammonia (NH₃) is incorporated into glutamate to yield glutamine and is generally not secreted. However, in this study, NH₃- excreting strains of nitrogen-fixing Paenibacillus were isolated from soil. The ammonium production by the Paenibacillus strains was ass...
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PMID: 20798591
PDF is available here.
PDF is available here.
A second soluble Hox-type NiFe enzyme completes the hydrogenase set in Thiocapsa roseopersicina BBS.
Abstract
Three functional NiFe hydrogenases were previously characterized in Thiocapsa roseopersicina BBS: two of them are attached to the periplasmic membrane (HynSL and HupSL), and one is localized in the cytoplasm (HoxEFUYH). The ongoing genome sequencing project revealed the presence of genes coding for...
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PMID: 20543059
PDF is available here.
PDF is available here.
Abstract
Of a total of 555 (429 female) subjects, 106 (19.1%) subjects reported current PPI use. Among those on PPI, 46.2% had a positive LBT. This was not different from the 56.3% positive LBT in non-PPI subjects (OR = 0.67, CI = 0.436-1.017, P = 0.06). No differences in hydrogen parameter were seen with PP...
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PMID: 19834807
PDF is available here.
PDF is available here.
Abstract
The nitrogen-fixing nonheterocystous cyanobacterium Plectonema boryanum was used as a model organism to study hydrogen generation by indirect biophotolysis in nitrogen-limited batch cultures that were continuously illuminated and sparged with argon/CO(2) to maintain anaerobiosis. The highest hydroge...
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PMID: 19697159
PDF is available here.
PDF is available here.
Abstract
Bioresource Technology (101)15 2010
Abstract
Xylan and rice straw were used to produce H(2) via a two-stage approach combining feedstock pretreatment/hydrolysis and dark H(2) fermentation. Acinetobacter junii F6-02 was used to produce cellulolytic enzymes (mainly xylanase) to hydrolyze xylan and pretreated rice straw. The hydrolysates were con...
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PMID: 20385486
PDF is available here.
PDF is available here.
Bioresource Technology (101)15 2010
Abstract
A one-pot process combining transesterification and selective hydrogenation was established to produce biodiesel from hemp (Cannabis sativa L.) seed oil which is eliminated as a potential feedstock by a specification of iodine value (IV; 120 g I(2)/100g maximum) contained in EN 14214. A series of al...
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PMID: 20231090
PDF is available here.
PDF is available here.
Bioresource Technology (101)15 2010
Abstract
The hydrogenation of biodiesel was investigated in presence of thermoregulated phase-transfer catalysts to produce fatty alcohols. The thermoregulated catalytic system Pd/IV (IV: P-ligand, tri-(methoxyl polyethylene glycol)-phosphite) exhibited an efficient catalytic performance for the hydrogenatio...
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PMID: 20338750
PDF is available here.
PDF is available here.
Journal of Biological Chemistry (285)30 2010
Abstract
We describe a new respiratory complex that was isolated as a major protein present in the membranes of Desulfovibrio vulgaris Hildenborough. The complex, which was named Qrc, is the first representative of a new family of redox complexes. It has three subunits related to the complex iron-sulfur moly...
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PMID: 20498375
PDF is available here.
PDF is available here.
Abstract
We suggest that the similarity of KIEs, in addition to the formation of the ring-intact CPA, argues for a similar mechanism of Compound I (Cpd I) formation followed by HAT for N-dealkylation by the native and N-oxide-supported systems and demonstrate the ability of the N-oxide-generated oxidant to a...
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PMID: 20521282
PDF is available here.
PDF is available here.
Abstract
The properties of a single heated palladium (Pd) nanowire for the detection of hydrogen gas (H(2)) are explored. In these experiments, a Pd nanowire, 48-98 microm in length, performs three functions in parallel: 1) Joule self-heating is used to elevate the nanowire temperature by up...
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PMID: 20564483
PDF is available here.
PDF is available here.
Abstract
Uniform SnO(2) nanorod arrays were deposited on a 4 inch SiO(2)/Si wafer by plasma-enhanced chemical vapor deposition (PEVCD) at low deposition temperature of around 300 degrees C. The SnO(2) nanorods were connected at the roots, thus the nanorod sensors could be fabricated by a feasible way compati...
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PMID: 20648350
PDF is available here.
PDF is available here.