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  1. No Access

    Article

    An improved scheme of leucine derivative fragmentation in mass spectrometry

    This study illustrates the contribution of stable isotopes to amino acid mass spectrometry. The mass spectra of natural leucine and 113C leucine were compared and the mass fragmentography pattern analysed. This a...

    C. Perier, J. Doumit, J. Frey in Amino Acids (1996)

  2. No Access

    Article

    Separation of amino acids using ion-paired reversed-phase high-performance liquid chromatography with special reference to collagen hydrolysate

    The collagen study includes the analysis of its characteristic amino acids: proline, hydroxyproline, lysine, hydroxylysine. HPLC offers an interesting device if associated with on-line radiometric detection fo...

    J. Frey, A. Chamson, N. Raby in Amino Acids (1993)

  3. No Access

    Chapter and Conference Paper

    Synthesis and Biological Activity of Agonists for the Neuronal Tachykinin Receptor in Guinea Pig Ileum

    The classification of tachykinin receptors into two subclasses, the SP-P and the SP-E receptors has been well established (1). Recently Laufer et. al. (2) characterized, in the guinea pig ileum, a third tachyk...

    D. Ron, R. Laufer, J. Frey, C. Gilon, Z. Selinger, M. Chorev in Substance P and Neurokinins (1987)

  4. No Access

    Article

    Ω mutagenesis in gram-negative bacteria: A selectable DNA fragment which terminates transcription in a wide range of bacterial species

    J. Frey, J. Deshusses, H. M. Krisch in Experientia (1986)

  5. No Access

    Article

    Place de la prolyl hydroxylase dans la synthèse du collagène de cellules KB

    KB cells, which synthetized collagen at a low rate, shown a prolyl hydroxylase activity at the same rate that fibroblast. The relationship between collagen synthesis and prolyl hydroxylase activity in these ce...

    J. Farjanel, P. Vallier, M. C. Ronzière, J. Frey in Experientia (1979)

  6. Article

    Étude de l'activité de la protocollagène proline hydroxylase de foie d'embryon de Poulet en fonction de l'âge

    In chick embryo liver, there was a peak activity of protocollagen proline hydroxylase (PPH) on the 18th day of the embryonnic state. The effect of triton X100 suggested that PPH was a particulate enzyme, in co...

    Geneviève Helfre, J. Farjanel, Juliette Fonvielle, J. Frey in Experientia (1974)

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  7. No Access

    Article

    Étude biochimique des poissons: 1. Variations semestrielles de la teneur en eau et en protéines du tissu musculaire de la truite Arc-en-ciel (Salmo gairdnerii Rich)

    The authors have noted, during the reproductive cycle of the Rainbow trout (Salmo gairdnerii Rich), important variations concerning water and total proteins content. This study shows a great correlation between t...

    J. Gras, R. Reynaud, L. Gamoty, J. Frey, J. C. Henry in Experientia (1967)

  8. No Access

    Article

    Étude biochimique des poissons: 2. Variations semestrielles de la teneur en glycogène, en lipides totaux et en minéraux du tissu musculaire de la truite Arc-en-ciel (Salmo gairdnerii Rich)

    The variations of glycogen, lipids and ashes in muscular tissue of the Rainbow trout (Salmo gairdnerii Rich.) show that during sexual cycle there are 4 periods. Each period corresponds to a particular biological ...

    J. Gras, R. Reynaud, L. Gamoty, J. Frey, J. C. Henry in Experientia (1967)

  9. No Access

    Article

    Magnetische Ferrite mit Perminvarschleife

    M. Kornetzki, J. Brackmann, J. Frey in Naturwissenschaften (1955)