Keto acids and free amino acids during leaf growth in Bauhinia purpurea L

Summary The biosynthesis of keto acids and free amino acids was studied during the growth of Bauhinia purpurea leaves. -KGA, OAA, pyruvic acid and PEP are the important keto acids observed at various stages. The first 2 metabolites show a progressive increase and PEP OAA pathway is very active during the process of growth.     

Concerning the free amino acids in the hydroid tubularia

Résumé La composition de l'amine acide libre dans les deux espèces deTubularia a été examinée au moyen de la chromatographie. Les tissus d'hydranthe deT. crocea avaient 21 amines acides libres dont 18 ont été identifiées dans les hydrocauli et dans les hydranthes régénérés deT. crocea, 19 dans les hydranthes deT. spectabilis et 14 dans les hydrocauli deT. spectabilis. La différence principale entre les hydranthes et les hydrocauli réside dans la distribution de certaines taches non-identifiées qui apparurent dans les chromatogrammes developpés avec la ninhydrine et les réactifs pour les groupes des imidazoles, guanidines, ou sulfhydriles.

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Part of a dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Florida State University. Aided by a National Science Foundation Predoctoral Fellowship and a National Science Foundation Grant to Dr. C. B.Metz, Contribution number 122 from the Oceanographic Institute, Florida State University.     

The influence of pyridoxine on the free amino acids of decotylized pea seedlings

Zusammenfassung Es wird festgestellt, dass in jungen Erbsenkeimlingen, die ihrer Kotyledonen beraubt wurden, einige freie Aminosäuren fehlen. Wenn solche Keimlinge mit Pyridoxinlösung infiltriert werden, ist jedoch unter ihren freien Aminosäuren auch die sonst fehlende Glutaminsäure nachweisbar.     

Chromosome studies and chromatographic analysis of free amino acids in two species of coleoptera

Résumé Le nombre des chromosomes diploïdes est de 20 dans les deux espèces de Coléoptères TénébrionïdesGonocephalum depressum etScleron sp. Il y a 18 autosomes et 2 chromosomes sexuels. Ils s'observent dans les acides amino libres. Dasns leScleron sp., il n'a en a que 14. La systématique de ces espèces est discutée sur la base de leurs caractères biochimiques.

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The author is grateful to Dr.A. R. Kasturi Bai, Central College, Bangalore (S. India), for her valuable suggestions and guidance. He is grateful to the Principal, Central College, Bangalore, for permitting him to work in the Zoology Department, Central College, and the Principal, Maharani's College, Bangalore, and the Director of Collegiate Education in Mysore, Bangalore, for the encouragement.     

The effect of glutamate,cysteate and related amino acids on insect muscle

Summary Application of Glu, CySO₂ or CySO₃ to blowfly larvae caused paralysis and increased the membrane potential of larval muscle. The contents of Glu and CySO₃ in larval muscle containing motor nerve terminals were markedly decreased after the perfusion of high K⁺ saline solution.     

Effect of desipramine on the contents of some free amino acids of mouse brain

I.p. injections of desipramine-HCl (100 mg/kg) produced decreases in the contents of several amino acids of mouse brain after 1 h. Using a 10-100 mg/kg range of doses, these effects appeared to be dose-dependent for alpha-alanine and aspartate. These changes may be due, in part, to a decrease in cerebral oxidative metabolism (Krebs cycle activity) which occurs secondarily to desipramine-induced hypothermia.     

Effect of desipramine on the contents of some free amino acids of mouse brain

Summary I.p. injections of desipramine-HCL (100 mg/kg) produced decreases in the contents of several amino acids of mouse brain after 1 h. Using a 10–100 mg/kg range of doses, these effects appeared to be dose-dependent for -alanine and aspartate. These changes may be due, in part, to a decrease in cerebral oxidative metabolism (Krebs cycle activity) which occurs secondarily to desipramine-induced hypothermia.This study was supported by Centro Ramón y Cajal and Fundacion Juan March.     

The asymmetry of the nucleotide bases and amino acids

Summary Due to the electric polarisation induced by the carbon and nitrogen atoms, the molecules of the nucleotide bases present a stereo-asymmetry. The DNA right-handed double helix is determined by the asymmetry of the nucleotide bases and it is concordant with the right-handed -helix of the polypeptide molecules formed by L-amino acids.     

Some effects of radiation on the free amino acids of adult female Mediterranean fruit fly,Ceratitis capitata Wied

Summary Ceratitis capitata pupae, 2–3 days before adult emergence, were treated with gamma irradiation from a⁶⁰Co source. The female fruit flies were extracted and analyzed for free amino acids.     

On the problem of linear incorporation of amino acids into cell protein

Summary Incorporation of amino acids into mammalian cell protein shows immediate linear kinetics when measured at intervals as small as 5 sec. Free amino acids equilibrate instantaneously across the cell membrane, acting as the precursor supply. Glycine, which does not initially show linear kinetics, may have a significant endogenous precursor supply, but this is not the acid-soluble pool.Acknowledgments. I thank the University of Aberdeen Medical Faculty Endowment Fund for support, and Mrs J. Robertson for technical assistance.     

The free amino acid pools of two aquatic hyphomycetes

Résumé Les masses communes des amino-acides libres chezTetracladium setigerum etHeliscus submersus ont été analysées par des méthodes chromatographiques utilisant une couche mince de cellulose. Elles sont typiques pour la plupart des mycètes. Les amino-acides libres n'apparaissant que rarement ont été: l'hydroxyproline chezT. setigerum cultivé sur de l'acide glutamique, l'éthanolamine chezT. setigerum etH. submersus cultivé sur l'acide glutamique et enfin l'acide -aminobutyrique chezH. submersus avec comme nutrition la tyrosine.     

The action of hydrogen peroxide on amino acids in presence of iron salts and its bearing on photolysis of amino acids

Zusammenfassung Es wurde der Abbau von Aminosäuren durch Wasserstoffsuperoxyd in Gegenwart von Eisensalzen untersucht. Papierchromatographische Analyse zeigte, dass dabei aus-Aminobuttersäure-Alanin und Glycin, aus-Alanin und Serin Glycin entsteht. Die Bildung von-Alanin und Asparaginsäure aus-Aminobuttersäure und von Asparaginsäure aus Glutaminsäure konnte ebenfalls festgestellt werden. Diese Resultate werden in Zusammenhang gebracht mit dem Mechanismus der Photolyse von Aminosäuren in Gegenwart von TiO₂.     

Alterations of free amino acids concentrations in cat brain induced by rapid eye movement sleep deprivation

Résumé La concentration de certains acides aminés libres au niveau du cerveau chez le chat change sous l'influence de la privation élective du sommeil paradoxal. Ces changements pourraient s'expliquer par l'augmentation d'excitabilité nerveuse associée à la privation élective du sommeil paradoxal.     

Separation of free amino acids and derivatives in the tsetse flyGlossina palpalis (diptera) by ion-exchange chromatography

Zusammenfassung Mittels Ionenaustausch-Chromatographie konnten 37 freie Ninhydrin-positive Stoffe in adulten Tsetse-Fliegen,Glossina palpalis, aufgetrennt werden. Die meisten Derivate der Aminosäuren wurden vor der Asparaginsäure aus der Harzsäule eluiert, was auf ihre saure Natur hindeutet.

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The financial assistance received from the University for my visit to Zürich is greatly appreciated. I wish to thank the staff (Entomology Section) of the Nigerian Institute for Trypanosomiasis Research, Kaduna, for the supply ofGlossina palpalis pupae.