Dl Aspartic Acid
Mostrando 1-12 de 24 artigos, teses e dissertações.
-
1. Espalhamento Raman dependente da temperatura em cristais de Ãcido DL-aspÃrtico. / Temperature Dependent Raman Scattering on DL-Aspartic Acid Crystals
Nesta dissertaÃÃo sÃo apresentados resultados de espalhamento Raman em cristais de Ãcido DL-aspÃrtico sob diversas condiÃÃes de temperatura. O Ãcido DL-aspÃrtico (C4H7NO4) cristaliza-se no grupo espacial C2h6 com oito molÃculas por cÃlula unitÃria, existindo portanto 128 Ãtomos na cÃlula unitÃria que darÃo origem a 384 modos normais de vibra�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/02/2010
-
2. Aspartic acid racemization in heavy molecular weight crystallins and water insoluble protein from normal human lenses and cataracts.
High D/L aspartic acid ratios are observed in heavy molecular weight aggregates and in water-insoluble protein extracted from whole lenses and nuclear and cortical regions. Purified alpha-, beta-, and gamma-crystallins have low D/L ratios. Fractionation of urea-solubilized material from the water-insoluble protein yields four molecular weight classes of prot
-
3. Influence of Nutrition on the Morphology of a Strain of Bifidobacterium bifidum
A mucoid variant of Bifidobacterium bifidum was converted from its normal curved rod or bifid form to a highly branched form when grown in a chemically defined minimal medium. Branching could be prevented by the addition of a mixture of dl-alanine, dl-aspartic acid, l(+)-glutamic acid, and dl-serine, but not when any one of these four amino acids was omitted
-
4. Induction of Pigmentation in Nonproliferating Cells of Serratia marcescens by Addition of Single Amino Acids
Addition of casein hydrolysate to suspensions of washed, nonpigmented, nonproliferating Serratia marcescens incubating at 27 C induced biosynthesis of prodigiosin. Four amino acids of casein hydrolysate, dl-aspartic acid, l-glutamic acid, l-proline, and l-alanine caused formation of pigment when added individually. dl-Ornithine also was effective. Optimal co
-
5. Baroreceptor-vasomotor reflex after N-methyl-D-aspartate receptor blockade in rabbit caudal ventrolateral medulla.
1. Experiments were performed in anaesthetized rabbits to determine whether blockade of N-methyl-D-aspartate receptors in the caudal ventrolateral medulla oblongata prevents the changes in renal sympathetic vasomotor activity which normally occur in response to increases or decreases in arterial pressure. 2. N-Methyl-D-aspartic acid receptor blockade using b
-
6. Racemization of aspartic acid and phenylalanine in the sweetener aspartame at 100 degrees C.
The racemization half-lives (i.e., the time required to reach a D/L = 0.33) at pH 6.8 for aspartic acid and phenylalanine in the sweetener aspartame (L-aspartyl-L-phenylalanine methyl ester) were determined to be 13 and 23 hours, respectively, at 100 degrees C. Racemization at this pH does not occur in aspartame but rather in its diketopiperazine decompositi
-
7. Molecular Characterization of a Thermostable Cyanophycin Synthetase from the Thermophilic Cyanobacterium Synechococcus sp. Strain MA19 and In Vitro Synthesis of Cyanophycin and Related Polyamides
The thermophilic cyanobacterium Synechococcus sp. strain MA19 contained the structural genes for cyanophycin synthetase (cphA) and cyanophycinase (cphB), which were identified, cloned, and sequenced in this study. The translation products of cphA and cphB exhibited high levels of similarity to corresponding proteins of other cyanobacteria, such as Anabaena v
American Society for Microbiology.
-
8. Regulation of cephamycin C synthesis, aspartokinase, dihydrodipicolinic acid synthetase, and homoserine dehydrogenase by aspartic acid family amino acids in Streptomyces clavuligerus.
The effect of the cephalosporin precursors and amino acids of the aspartic acid family on antibiotic production by Streptomyces clavuligerus was investigated DL-meso-Diaminopimelate and L-lysine each stimulated specific antibiotic production by 75%. A fourfold increase in specific production was obtained by simultaneous addition of the two compounds. The sti
-
9. Concanavalin A selectively reduces desensitization of mammalian neuronal quisqualate receptors.
A fast perfusion system was used to apply excitatory amino acids to embryonic hippocampal neurons grown in dissociated culture and voltage clamped in the whole-cell recording configuration. Responses to quisqualic acid and DL-alpha-amino-3-hydroxy-5-methyl-4-isoxazoleproprionic acid (AMPA; a potent quisqualate-like agonist) showed rapid desensitization: at 1
-
10. Induction of Prodigiosin Biosynthesis after Shift-Down in Temperature of Nonproliferating Cells of Serratia marcescens
Nonpigmented bacteria obtained by growth of Serratia marcescens at 38 C synthesized prodigiosin at 25 C if certain individual amino acids were added to cultures of nonproliferating cells. In order of effectiveness, the amino acids were: DL-histidine, L-proline, L-hydroxyproline, DL-alanine, L-alanine, DL-aspartic acid, D-alanine, DL-proline, L-serine, L-orni
-
11. Characterization of the Dominant Aerobic Microorganism in Cattle Feedlot Waste
The dominant aerobic microorganism in cattle feedlot waste (FLW) is a corynebacterium. It is ubiquitous to FLW except on sites where antibiotics are a constant part of the animals' diet. The organism requires DL-aspartic acid as its nitrogen source for growth, and individual strains also require or are stimulated by L-tyrosine; acetate serves as the carbon s
-
12. Superantigen-presentation by rat major histocompatibility complex class II molecules RT1.Bl and RT1.Dl
Rat major histocompatibility complex (MHC) class II molecules RT1.Bl (DQ-like) and RT1.Dl (DR-like) were cloned from the LEW strain using reverse transcription–polymerase chain reaction and expressed in mouse L929 cells. The transduced lines bound MHC class II-specific monoclonal antibodies in an MHC-isotype-specific manner and presented peptide antigens a
Blackwell Science Inc.