Disease relevance of methane

• In suspensions of Escherichia coli both phosphorus-31 and carbon-13 NMR studies of glycolysis and bioenergetics are presented [1].
• The results of two recent studies are shown, a classification of subjects as normal or cystic fibrosis heterozygotes and simulation of chemical shifts of carbon-13 nuclear magnetic resonance spectra by linear model equations [2].
• We investigated adipose tissue fatty acid composition in 22 moderately to severely malnourished patients with cirrhosis and in 22 healthy volunteers by in vivo carbon-13 magnetic resonance spectroscopy (MRS) [3].
• Carbon-13 NMR in conformational analysis of nucleic acid fragments. 4. The torsion angle distribution about the C3'-O3' bond in DNA constituents [4].
• Magic angle spinning carbon-13 NMR of tobacco mosaic virus. An application of the high-resolution solid-state NMR spectroscopy to very large biological systems [5].

Psychiatry related information on methane

• A carbon-13 nuclear magnetic resonance relaxation time study of streptozotocin-deoxyguanosine-5'-monophosphate-deoxycytidine-5'-monophosphate interactions [6].
• Evaluation of the carbon 13-labeled Ketoisocaproate breath test to assess mitochondrial dysfunction in patients with high alcohol consumption [7].

High impact information on methane

• A carbon-13 urea breath test was performed at base line and repeated at 1 and 12 months, and endoscopic biopsy was performed at 12 months to determine H. pylori status [8].
• High-field carbon-13 nuclear magnetic resonance (NMR) spectroscopy has been used to monitor the isotopic dilution of doubly carbon-13-labeled precursors for 2,3-cyclopyrophosphoglycerate, a novel primary metabolite that occurs in certain methanogens [9].
• The carbon-13 sensitivity and resolution obtained shows that natural abundance carbon-13 NMR will be valuable in the study of disorders in fat metabolism, and that experiments with substrates labeled with carbon-13 can be used to study carbohydrate metabolism in vivo [10].
• In rat liver cells the pathways of gluconeogenesis from carbon-13-labeled glycerol are followed by carbon-13 NMR [1].
• MR spectroscopy of proton and carbon-13 nuclei has been used to measure rates of glucose transport and metabolism in the human brain [11].

Chemical compound and disease context of methane

• In this paper we describe carbon-13 nuclear magnetic resonance results on 13C-enriched purified transfer RNAI(VAL) from from E. coli SO-187, a uracil requiring auxotroph [12].
• The recombinant N-terminal 107-amino acid polypeptide fragment 2-108 of the DnaJ molecular chaperone of Escherichia coli, which contains the J-domain (residues 2 to 76) and the Gly/Phe-rich region (residues 77 to 108), was uniformly labeled with nitrogen-15 and carbon-13 [13].
• Metabolic pathways of glucose utilization have been investigated in a human colon adenocarcinoma cell line (HT29) using carbon-13 Nuclear Magnetic Resonance spectroscopy [14].
• Aspartate beta-decarboxylase from Alcaligenes faecalis: carbon-13 kinetic isotope effect and deuterium exchange experiments [15].
• The carbon-13 kinetic isotope effect on the dehydration of HCO3- by bovine carbonic anhydrase has been measured [16].

Biological context of methane

• Indexing tricarboxylic acid cycle flux in intact hearts by carbon-13 nuclear magnetic resonance [17].
• Carbon 13 NMR studies of saturated fatty acids bound to bovine serum albumin. I. The filling of individual fatty acid binding sites [18].
• Kinetics of alpha-mannosidase action on various alpha-D-mannopyranosyl linkages in hen ovalbumin glycopeptides as monitored by carbon 13 nuclear magnetic resonance spectroscopy [19].
• Two mutants were specifically defective in the hydroxylation of carbon 13; their total gibberellin production was normal, but their main gibberellin was GA7 instead of GA3 [20].
• Direct observation of glycogenesis and glucagon-stimulated glycogenolysis in the rat liver in vivo by high-field carbon-13 surface coil NMR [21].

Anatomical context of methane

• Specific labeling of the lignin polymer in situ with [1-13C]-, [2-13C]-, and [3-13C]Phe and analysis of the cell wall preparations by solid-state carbon-13 NMR spectroscopy permitted the first direct determination of the in situ bonding patterns in a gymnosperm lignin [22].
• To understand better the iron-carbonate interaction, experiments were performed with iron(III) and copper(II) complexes of human milk lactoferrin and serum transferrin with carbon-13-labeled carbonate [23].
• Carbon-13 nuclear magnetic resonance spectroscopy measurements indicated that human kidney tubules converted [2-(13)C]chloroacetaldehyde to [2-(13)C]chloroacetate, the further metabolism of which was very limited [24].
• High-resolution proton and carbon-13 NMR of membranes: why sonicate [25]?
• Natural abundance carbon-13 nuclear magnetic resonance studies of bovine white matter and myelin [26].

Associations of methane with other chemical compounds

• The transfer of the methyl group from methylcobalamin to diaquocobinamide in aqueous solution has been demonstrated by proton, carbon-13, and phosphorus-31 nuclear magnetic resonance spectroscopy [27].
• Effect of calcium on structure and function of a hyaluronic acid matrix: carbon-13 nuclear magnetic resonance analysis and the diffusional behavior of small solutes [28].
• Titration behavior and tautomeric states of individual histidine residues of myoglobins. Application of natural abundance carbon 13 nuclear magnetic resonance spectroscopy [29].
• Administration of [1-13C]Phe to these cultures, followed by solid-state carbon-13 NMR spectral analysis of their cell walls, demonstrated that the phenylalanine incorporated into the cell wall matrix was primarily as protein, rather than lignin [22].
• The isotope fractionation at C-2 of pyruvate gives strong evidence that the well known relative carbon-13 depletion in lipids from biological material is mainly caused by the isotope effect on the pyruvate dehydrogenase reaction [30].

Gene context of methane

• In this study, the logarithm of the isomerization rate to the delta 2 ester (log k12) correlated with the carbon-13 nuclear magnetic resonance chemical shift difference value at C-3 and C-4 of the delta 3 ester (delta delta (4-3)) [31].
• Formation of octopus artificial pigments with both all-trans and 11-cis dihydro chromophores leads to a similar model for octopus rhodopsin and metarhodopsin: there are two negative charges in the chromophore-binding site, one directly hydrogen bonded to the Schiff base nitrogen and a second near carbon-13 [32].
• The absorption maxima of bovine artificial pigments formed by regenerating opsin with the 11-cis dihydro series of chromophores support a color regulation model for bovine rhodopsin in which the chromophore-binding site of the protein has two negative charges: one directly hydrogen bonded to the Schiff base nitrogen and another near carbon-13 [32].
• Multinuclear magnetic resonance studies of the 2Fe.2S* ferredoxin from Anabaena species strain PCC 7120. 2. Sequence-specific carbon-13 and nitrogen-15 resonance assignments of the oxidized form [33].
• These changes can be observed with water-suppressed proton (H-1) and carbon-13 (C-13) nuclear magnetic resonance spectroscopy (NMR) and gas chromatography [34].

Analytical, diagnostic and therapeutic context of methane

• Additional confirmatory evidence for the sulfhydryl compound was obtained with carbon-13 NMR and mass spectroscopies [35].
• The resulting oligosaccharides and monosaccharides were separated by gel filtration and ion-exchange chromatography, and their structures were determined by proton and carbon-13 NMR, fast atom bombardment mass spectrometry, and chromatographic techniques combined with chemical modifications [36].
• The exposed central helix that connects the two domains is helical in solution, albeit not rigid, a result that is supported by amide proton protection factors, circular dichroism measurements, and carbon-13 and proton chemical shift index values [37].
• Carbon-13 labeled polymers: an alternative tracer for depth profiling of polymer films and multilayers using secondary ion mass spectrometry [38].
• Carbon-13 NMR imaging has been combined with 1H-13C polarization transfer to improve image quality [39].

References