نتایج جستجو برای: 15n and 13c

تعداد نتایج: 16830084  

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2003
G I Manetta E Benedito-Cecilio M Martinelli

In order to verify the carbon source and trophic position of the main species of fishes, of the Paraná River floodplain, we analysed the proportion of stable carbon (delta 13C) and nitrogen (delta 15N) isotopes in muscle of fishes sampled in the rainy season. We analyzed adult individuals of Loricariichthys platymetopon, Schizodon borellii, Leporinus lacustris, Auchenipterus osteomystax, Iherin...

2006
Denise Alves Ferreira Antonio Gilberto Ferreira Lucinéia Vizzotto Alberto Federman Neto Anselmo Gomes de Oliveira D. A. Ferreira A. G. Ferreira L. Vizzotto A. Federman Neto A. G. Oliveira

Inclusion complexes of rifampicin (RP) were prepared with hydroxypropyl-β-cyclodextrin (HPβCD). The aqueous solubility of RP increased linearly with cyclodextrin concentration in all range of the solubility diagram. The data was analyzed using the framework of Higuchi and Connors. The stability constant (K) values for RP/HPβCD complex at pH 6.9 were 18 and 120-125 M-1 for ionic strength 0.01 an...

Journal: :Journal of biomolecular NMR 2001
M Schubert H Oschkinat P Schmieder

Four novel amino acid type-selective triple resonance experiments to identify the backbone amino proton and nitrogen resonances of Arg and Lys and of their sequential neighbors in (13C,15N)-labeled proteins are presented: the R(i+1)-HSQC and R(i,i+1)-HSQC select signals originating from Arg side chains, the K(i+1)-HSQC and K(i,i+1)-HSQC select signals originating from Lys side chains. The selec...

Journal: :Journal of magnetic resonance 2006
William W Brey Arthur S Edison Robert E Nast James R Rocca Saikat Saha Richard S Withers

We report a 600-MHz 1-mm triple-resonance high-temperature-superconducting (HTS) probe for nuclear magnetic resonance spectroscopy. The probe has a real sample volume of about 7.5 microl, an active volume of 6.3 microl, and appears to have the highest mass sensitivity at any field strength. The probe is constructed with four sets of HTS coils that are tuned to 1H, 2H, 13C, and 15N, and there is...

2015
Kevin A. Thorn Larry G. Cox Ayyalusamy Ramamoorthy

Despite recent advances in spectroscopic techniques, there is uncertainty regarding the nature of the carbonyl groups in the asphaltene and resin fractions of crude oil, information necessary for an understanding of the physical properties and environmental fate of these materials. Carbonyl and hydroxyl group functionalities are not observed in natural abundance 13C nuclear magnetic resonance (...

Journal: :Zeitschrift fur Naturforschung. C, Journal of biosciences 1989
A Hädener P Roth C Tamm

Incorporation of L-[2-2H]phenyl-[2-2H]alanine and L-phenyl-[2-13C, 15N]alanine into cytochalasin D by Zygosporium masonii involved the complete loss of both the alpha-2H- and the alpha-15N-atom. Incorporation of a mixture of L-phenyl-[15N]alanine and L-[U-14C]phenylalanine into cytochalasin D and protein amino acids (phenylalanine, leucine, isoleucine) was accompanied by a substantial loss of 1...

Journal: :Biochemistry 1989
D A Torchia S W Sparks A Bax

Sequential assignments are reported for backbone 15N and 1H of nearly all residues of staphylococcal nuclease (Nase) complexed with thymidine 3',5'-diphosphate and Ca2+. Because of the relatively large size of the Nase ternary complex, Mr 18K, the crucial element of our assignment strategy was the use of isotope-edited two-dimensional NMR spectra, particularly 15N-edited nuclear Overhauser enha...

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