Results 211 to 220 of about 628,414 (263)
Co(II)-amino acid–CaAl-layered double hydroxide composites – Construction and characterization [PDF]
Journal of Molecular Structure, 2019 Abstract The construction of Co(II)-amino acid complexes ( l -histidine, l -cysteine, l -tyrosine) among the layers of CaAl-layered double hydroxide was attempted. The stepwise intercalation (introducing the anionic form of the amino acid first, then constructing the Co(II) complex) proved to be unsuccessful, while the direct ion exchange of the ...
Gabor Varga +2 more
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The stability of the double amino acid with respect to deamination in gas and aqueous phases
Theoretical Chemistry Accounts, 2016The double amino acid (DAA) molecule ((NH2)2C(COOH)2) whose existence was postulated recently is investigated regarding its stability against the unimolecular deamination process in both gas and aqueous phases. The results of ab initio MP2/aug-cc-pVDZ calculations indicate that neither the canonical form of the DAA nor its ionized (zwitterionic ...
Sylwia Freza
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Parthenogenesis doubles the rate of amino acid substitution in whiptail mitochondria
Evolution, 2022Sexual reproduction is ubiquitous in the natural world, suggesting that sex must have extensive benefits to overcome the cost of males compared to asexual reproduction. One hypothesized advantage of sex with strong theoretical support is that sex plays a role in removing deleterious mutations from the genome.
Jose A. Maldonado +3 more
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Amino Acid-Pillared Layered Double Hydroxide and Montmorillonite Thermal Characteristics [PDF]
Journal of Thermal Analysis and Calorimetry, 1999 Zn-Al hydrotalcite (HT) and Na-montmorillonite (Na-mont) were pillared by the deprotonated and the protonated forms of L-tyrosine, respectively. Pillaring was successful as the increased basal spacings due to intercalation attest. L-Tyr-HT proved to be thermally less stabile than HT, while that of L-Tyr-mont did not change compared to Na-mont.
Fudala Ágnes +3 more
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Double amino acid – A novel molecule enabling peptide interpenetrating structures
Chemical Physics Letters, 2014Peptide chains might be linked with one another using various external bifunctional molecules. We postulate an existence of a novel molecule termed ‘double amino acid’ containing four functional groups connected to one C atom ((NH2)2C(COOH)2). Using correlated ab initio approach (QCISD and MP2 methods) we provide its structure, simulated IR spectrum ...
Sylwia Freza +2 more
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Study of double and triple simultaneous substitutions of amino acids in cytochromes C
Journal of Molecular Evolution, 1975A statistical analysis aimed at obtaining some informations on a possible correlation between simultaneous amino acid substitutions is proposed. This method is applied to a set of cytochrome C, at the level of tandem and triple substitutions separated along the peptide chain by 1 to 15 peptide bonds.
Schlusselberg, Jean +1 more
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Immobilized Double-Racemase Hydantoinase Process for L-Amino Acid Production
2021Protein immobilization is proving to be an environmentally friendly strategy for manufacturing biochemicals at high yields and low production costs. This work describes the optimization of the so-called “double-racemase hydantoinase process,” a system of four enzymes used to produce optically pure L-amino acids from a racemic mixture of hydantoins ...
Heras-Vázquez, Francisco Javier Las +3 more
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Direct Intercalation of Amino Acids into Layered Double Hydroxides by Coprecipitation
Journal of Solid State Chemistry, 2001Abstract First, the direct intercalation of amino acids into various layered double hydroxides (Mg–Al, Mn–Al, Ni–Al, Zn–Al, and Zn–Cr LDHs) by coprecipitation has been investigated using phenylalanine (Phe) as a guest amino acid. The degree of Phe coprecipitation was strongly influenced by the solution pH and kind of LDH system and reached a maximum ...
Sumio Aisawa +4 more
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Preparation and Characterization of Hybrid Organic−Inorganic Composite Materials Using the Amphoteric Property of Amino Acids: Amino Acid Intercalated Layered Double Hydroxide and Montmorillonite [PDF]
Inorganic Chemistry, 1999 Deprotonated and protonated forms of L-tyrosine or L-phenylalanine were intercalated by Zn-Al hydrotalcite (HT) and Na-montmorillonite (Na-mont), respectively. The intercalated materials were characterized by powder X-ray diffraction, BET measurements, and FT-IR spectroscopy. Intercalation was successful as the increased basal spacings attested.
Fudala Ágnes +2 more
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Canadian Journal of Biochemistry, 1978
A new double-labelling procedure for amino acid analysis which requires only routine chromatographic equipment is described. When 1-fluoro-2,4-dinitro[3H]benzene is reacted with a mixture of 14C-labelled amino acids followed by reaction with the same 14C-labelled amino acid mixture diluted with an unlabelled sample of amino acids, the 3H: 14C ratio in
H, Kaplan, D C, Cheng, G, Oda, M, Kates
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A new double-labelling procedure for amino acid analysis which requires only routine chromatographic equipment is described. When 1-fluoro-2,4-dinitro[3H]benzene is reacted with a mixture of 14C-labelled amino acids followed by reaction with the same 14C-labelled amino acid mixture diluted with an unlabelled sample of amino acids, the 3H: 14C ratio in
H, Kaplan, D C, Cheng, G, Oda, M, Kates
openaire +2 more sources