Secretion of cytokinins in vivo and in vitro byAlternaria brassicicola and their role in pathogenesis

Summary Formation of green islands in the host (mustard leaves) beneath the infection-drops containing germinating conidia ofAlternaria brassicicola (Schw.) Wiltsch. has been correlated with the secretion of cytokinins by the pathogen.A. brassicicola also synthesized cytokinins in the liquid synthetic medium. Cytokinins produced in vitro were extracted, and their application on the detached mustard leaves evoked the formation of green islands.     

Abnormal sensitivity to erythropoietin in the erythroblast precursors in Vaquez disease]

Marrow specimens of patients with polycythemia vera rise to erythrocytic colonies in vitro without addition of erythropoietin to the culture. This behavior was never observed with marrow cells of normal subjects or secondary erythrocytosis. These results indicate that the sensitivity of some erythrocytic progenitor cells to erythropoietin is altered in polycythemia vera.     

Characterization of the domestic horse (Equus caballus) karyotype using G-and C-banding techniques

Summary Giemsa banding techniques have been used to identify the chromosomes of the domestic horse.     

The localization of3H-corticosterone in mast cell granules by electron microscopic autoradiography

Zusammenfassung Der Einbau von 1,2-³H-Corticosteron in die Mastzellen der lymphatischen Organe wurde bei Mäusen untersucht. Bei gleichzeitiger Anwendung von Autoradiographie und Elektronenmikroskopie konnte das Corticosteron in den Mastzellen nachgewiesen werden.     

Der Einfluss des Urin-pH auf die Aktivität von Urinenzymen

Summary The relationship between the pH of urine and the measured activity of ULDH, UAP and UAA was investigated in vivo and in vitro. The activity of ULDH and UAP is only half as much, or less, in acid urine (pH 4.8–5.1) as it is in alkaline urine (pH 7.0–8.1). The UAA activity, however, does not change in the pH range measured. The isoenzymes ULDH 2–4, present in alkaline urine of normal adults, does not appear in acid urine.     

Threo-3,4-Dihydroxyphenylserine,a poor source of noradrenaline in the rat

Résumé Chez le rat, les injections dedl-thréo-3,4-dihydroxyphénylsérine, un précurseur pharmacologique synthétique de la noradrénaline, provoquent une conversion de moins de 1% au 4-hydroxy-3-méthoxyphényl-glycol, le métabolite urinaire majeur de la noradrénaline dans cette espèce. Un nouveau cheminement qui entraîne une coupure latérale de la chaîne prit environ 10% de la dose et un autre 10% fût excrété comme un amino-acideO-méthylé; le sort de quelque 80% est inconnu.