A convenient route to optically pure α-alkyl-β-(sec-amino)alanines.

abstract：:The relative amounts of free D-amino acids (D-AA) in the urine of seven healthy volunteers (age 27 to 49 years) were determined using chiral phase (Chirasil-L-Val) capillary gas chromatography in conjunction with selected ion monitoring mass spectrometry. The absolute amounts of free D-AA were determined by pre-column...

journal_title：Amino acids

authors： Brückner H,Haasmann S,Friedrich A

更新日期：1994-06-01 00:00:00

abstract：:Several new beta,beta-dihalo and beta-halo-beta-substituted dehydroalanines and dehydrodipeptides were synthesized by reacting the corresponding dehydroamino acid derivative with a N-halosuccinimide or in the case of beta,beta-di-iododehydroalanines with iodine. The results obtained confirmed that the stereochemical o...

journal_title：Amino acids

authors： Ferreira PM,Monteiro LS,Pereira G

更新日期：2010-07-01 00:00:00

abstract：:The objective of this study was to determine the dose as well as duration of exposure-dependent effects of L-alanyl-L-glutamine, arginine or taurine on polymorphonuclear neutrophil (PMN) free alpha-keto acid profiles and, in a parallel study, on PMN immune functions. Exogenous L-alanyl-L-glutamine significantly increa...

journal_title：Amino acids

authors： Mühling J,Nickolaus KA,Halabi M,Fuchs M,Krüll M,Engel J,Wolff M,Matejec R,Langefeld TW,Welters ID,Menges T,Dehne MG,Sablotzki A,Hempelmann G

更新日期：2005-11-01 00:00:00

abstract：:BE-3-3-3-3 (1,15-(ethylamino)4,8,12-triazapentadecane) is a bis(ethyl)polyamine analogue under investigation as a therapeutic agent for breast cancer. Since estradiol (E(2)) is a critical regulatory molecule in the growth of breast cancer, we examined the effect of BE-3-3-3-3 on estrogen receptor α (ERα) positive MCF-...

journal_title：Amino acids

authors： Nayvelt I,John S,Hsu HC,Yang P,Liu W,Das G,Hyvönen MT,Alhonen L,Keinänen TA,Shirahata A,Patel R,Thomas T,Thomas TJ

更新日期：2012-02-01 00:00:00

abstract：:Thrombin, the most potent physiological platelet agonist interacts with cells through a specific G protein-coupled receptor which has been cloned and sequenced. Synthetic thrombin receptor peptides (TRAPs) comprising the first 5 amino acids (SFLLR and SFLLR-NH2) of the new N-terminus tethered ligand of the thrombin re...

journal_title：Amino acids

authors： Alexopoulos K,Matsoukas J,Tselios T,Roumelioti P,Mavromoustakos T,Holada K

更新日期：1998-01-01 00:00:00

abstract：:Nonalcoholic fatty liver disease (NAFLD) is a globally widespread disease of increasing clinical significance. The pathological progression of the disease from simple steatosis to nonalcoholic steatohepatitis (NASH) has been well defined, however, the contribution of altered branched chain amino acid metabolomic profi...

journal_title：Amino acids

authors： Lake AD,Novak P,Shipkova P,Aranibar N,Robertson DG,Reily MD,Lehman-McKeeman LD,Vaillancourt RR,Cherrington NJ

更新日期：2015-03-01 00:00:00

abstract：:L-tryptophan (TRP) is the precursor amino acid for the synthesis of serotonin (5-HT). 5-HT is effective both on the food intake and gastrointestinal system contractility. The aim of this study was to search the effects of systemic TRP treatment on 5-HT levels of ileum and searching the effect of ileal contractility an...

journal_title：Amino acids

authors： Ozer C,Gönül B,Ercan ZS,Take G,Erdoğan D

更新日期：2007-01-01 00:00:00

abstract：:In the postgenomic era new technologies are emerging for global analysis of protein function. The introduction of active site-directed chemical probes for enzymatic activity profiling in complex mixtures, known as activity-based proteomics has greatly accelerated functional annotation of proteins. Here we review probe...

journal_title：Amino acids

authors： Schmidinger H,Hermetter A,Birner-Gruenberger R

更新日期：2006-06-01 00:00:00

abstract：:Carnosine is found in high concentrations in skeletal muscles, where it is involved in several physiological functions. The muscle carnosine content measured within a population can vary by a factor 4. The aim of this study was to further characterize suggested determinants of the muscle carnosine content (diet, gende...

journal_title：Amino acids

authors： Everaert I,Mooyaart A,Baguet A,Zutinic A,Baelde H,Achten E,Taes Y,De Heer E,Derave W

更新日期：2011-04-01 00:00:00

abstract：:Effects exerted by heavy isotope substitution in biopolymers on the functioning of whole organisms have not been investigated. We report on the decrease of permissive temperature of nematodes fed with bacteria containing 5,5-D2-lysine. We synthesized 5,5-dideuterolysine and, taking advantage of lysine being an essenti...

journal_title：Amino acids

authors： Korneenko TV,Pestov NB,Hurski AL,Fedarkevich AM,Shmanai VV,Brenna JT,Shchepinov MS

更新日期：2017-05-01 00:00:00

abstract：:Blood-borne angiotensin II (AngII) is known to mediate water-intake by its excitatory effect on neurons in the subfornical organ (SFO). Conversely, nitric oxide (NO) has exclusively inhibitory effects on rat SFO-neurons and on SFO-mediated water-intake. Extracellular and patch-clamp recordings from freshly dissociated...

journal_title：Amino acids

authors： Schmid HA

更新日期：1998-01-01 00:00:00

abstract：:A subline growing in medium without arginine and ornithine was established from a rat Reuber hepatoma cell line (R-Y121B·cho). The subline designated R-Y117B·cho was able to grow in glutamine, arginine and ornithine-free, glutamate-supplemented medium. Arginine synthesis from glutamate requires four urea cycle enzymes...

journal_title：Amino acids

authors： Yamamoto K,Niwa A

更新日期：1996-09-01 00:00:00

abstract：:The ethynylglycine synthon {(R)-2,2-dimethyl-3-(tert-butoxycarbonyl)-4-ethynyloxazolidine} is a chiral compound with valuable synthetic interest. An update on the different routes for its synthesis is reviewed and discussed. ...

journal_title：Amino acids

authors： Benfodda Z,Bénimélis D,Reginato G,Meffre P

更新日期：2015-02-01 00:00:00

abstract：:The purpose of the present study was to investigate the relationship between plasma carnitine concentration and body composition variation in relation to muscular and fat masses since there is no experimentally proved correlation between plasma carnitine and body masses. We used bioelectric impedance analysis (BIA), t...

journal_title：Amino acids

authors： Gatti R,De Palo CB,Spinella P,De Palo EF

更新日期：1998-01-01 00:00:00

abstract：:In the article (Romek et al. 2013) we reported the values of δ15N (‰) and δ13C (‰) obtained by. ...

journal_title：Amino acids

authors： Romek KM,Julien M,Frasquet-Darrieux M,Tea I,Antheaume I,Hankard R,Robins RJ

更新日期：2018-01-01 00:00:00

abstract：:The hydration of selected amino acids, alanine, glycine, proline, valine, isoleucine and phenylalanine, has been studied in aqueous solutions by means of FTIR spectra of HDO isotopically diluted in H2O. The difference spectra procedure and the chemometric method have been applied to remove the contribution of bulk wat...

journal_title：Amino acids

authors： Panuszko A,Adamczak B,Czub J,Gojło E,Stangret J

更新日期：2015-11-01 00:00:00

abstract：:We have been studying control mechanisms of gene expression in early embryogenesis in a South African clawed toad Xenopus laevis, especially during the period of midblastula transition (MBT), or the transition from the phase of active cell division (cleavage stage) to the phase of extensive morphogenesis (post-blastul...

journal_title：Amino acids

authors： Shiokawa K,Aso M,Kondo T,Takai J,Yoshida J,Mishina T,Fuchimukai K,Ogasawara T,Kariya T,Tashiro K,Igarashi K

更新日期：2010-02-01 00:00:00

abstract：:The article traces the development of research on the naturally occurring amino acid L-3,4-dihydroxyphenylalanine (L-dopa), from the first synthesis of its D,L racemate in 1911, and the isolation of its L-isomer from seedling of Vicia faba beans to the amino acid's successful application, from 1961 onward, as the most...

journal_title：Amino acids

authors： Hornykiewicz O

更新日期：2002-01-01 00:00:00

abstract：:Effects of taurine on the delayed rectifier K(+) channel in isolated 10-day-old embryonic chick ventricular cardiomyocytes were examined at different intracellular Ca(2+) concentrations ([Ca]i), using whole-cell voltage and current clamp techniques. Experiments were performed at room temperature (22°C). Test pulses we...

journal_title：Amino acids

authors： Satoh H

更新日期：1995-09-01 00:00:00

abstract：:Antimicrobial peptides (AMPs) with amphipathic β-hairpin structures have been demonstrated to possess potent antimicrobial activities and great cell selectivities. However, our understanding of β-hairpin antimicrobial peptides lags behind that of α-helices, mainly because it is difficult for short peptides to form rob...

journal_title：Amino acids

authors： Xu L,Chou S,Wang J,Shao C,Li W,Zhu X,Shan A

更新日期：2015-11-01 00:00:00

abstract：:Nitric oxide (NO) is a free radical gas synthesised from arginine and oxygen by enzymes of the family of the nitric oxide synthase. In particular, the neuronal nitric oxide synthase (nNOS) is highly expressed by cells of the hypothalamic paraventricular nucleus, where the sympatho-adrenal system, the hypothalamic-pitu...

journal_title：Amino acids

authors： Orlando GF,Wolf G,Engelmann M

更新日期：2008-06-01 00:00:00

abstract：:In the absence of exogenous Ca(2+) and Mg(2+) and in the presence of EGTA, which favours the release of endogenous Ca(2+), the polyamine spermine is able to stimulate the activity of pyruvate dehydrogenase complex (PDC) of energized rat liver mitochondria (RLM). This stimulation exhibits a gradual concentration-depend...

journal_title：Amino acids

authors： Pezzato E,Battaglia V,Brunati AM,Agostinelli E,Toninello A

更新日期：2009-03-01 00:00:00

abstract：:Phenolic compounds are interesting because of their antioxidant properties. In the present study, the antioxidant properties of L-tyrosine as a monophenolic and L-Dopa as a diphenolic amino acid were investigated by using different antioxidant assays: (i) 1,1-diphenyl-2-picryl-hydrazyl free radical (DPPH*) scavenging;...

journal_title：Amino acids

authors： Gülçin I

更新日期：2007-01-01 00:00:00

abstract：:This work is an extension of our previous work (Hall et al., 1993) on the synthesis and cytotoxic activity of boronated peptides. The aim of this work was to carry out structural modifications of the amine terminal in compounds1 and2, to increase water solubility, and its effect on the cytotoxicity to tumor cell lines...

journal_title：Amino acids

authors： Karthikeyan S,Sood A,Tomasz J,Spielvogel BF,Hall IH

更新日期：1995-12-01 00:00:00

abstract：:It is controversial whether homocysteic acid or other homocysteine derivatives show growth promoting effects. In a clonogenic assay we could show that homocysteine thiolactone and its alpha alkylated derivative increased colony formation significantly. Our work favorizes previous observations showing growth promoting ...

journal_title：Amino acids

authors： Lubec B,Szekeres T

更新日期：1994-02-01 00:00:00

abstract：:Taurine depletion leads to impaired mitochondrial function, as characterized by reduced ATP production and elevated superoxide generation. These defects can fundamentally alter cardiomyocyte function and if left unchanged can result in cell death. To protect against these stresses, cardiomyocytes possess quality contr...

journal_title：Amino acids

authors： Jong CJ,Ito T,Schaffer SW

更新日期：2015-12-01 00:00:00

abstract：:M33 is a branched peptide currently under preclinical characterization for the development of a new antibacterial drug against gram-negative bacteria. Here, we report its pegylation at the C-terminus of the three-lysine-branching core and the resulting increase in stability to Pseudomonas aeruginosa elastase. This pro...

journal_title：Amino acids

authors： Falciani C,Lozzi L,Scali S,Brunetti J,Bracci L,Pini A

更新日期：2014-05-01 00:00:00

abstract：:Cell-penetrating peptides, a group of short peptides, can traverse cell membranes to enter cells and thus facilitate the uptake of various molecular cargoes. Thus, they have the potential to become powerful drug delivery systems. The correct identification of peptides as cell-penetrating or non-cell-penetrating would ...

journal_title：Amino acids

authors： Chen L,Chu C,Huang T,Kong X,Cai YD

更新日期：2015-07-01 00:00:00

abstract：:The relationship between taurine concentrations of plasma, whole blood, serum and skeletal muscle during taurine depletion and repletion was investigated in cats, to identify the most useful indicators of taurine status. Sixteen cats were fed a purified diet containing either 0 or 0.15 g/kg taurine for 5 months. Treat...

journal_title：Amino acids

authors： Pacioretty L,Hickman MA,Morris JG,Rogers QR

更新日期：2001-12-01 00:00:00

abstract：:The effects of Red Bull Energy Drink, which includes taurine, glucuronolactone, and caffeine amongst the ingredients, were examined over 3 studies in a total of 36 volunteers. Assessments included psychomotor performance (reaction time, concentration, memory), subjective alertness and physical endurance. When compared...

journal_title：Amino acids

authors： Alford C,Cox H,Wescott R

更新日期：2001-01-01 00:00:00