Chemical investigation ofPluchea lanceolata II. Identity of pluchine with betaine hydrochloride

Zusammenfassung Die Struktur von Pluchin, einer quaternären Base ausPluchea lanceolata, wurde als die des Betainhydrochlorids aufgeklärt. Damit sind auch die mit Pluchin beobachteten biologischen Wirkungen verständlich.     

Electrophoretic mobilities of malate dehydrogenases from barley seedlings

Zusammenfassung Malatdehydrogenase aus der Mitochondrienfraktion von Gerstenkeimlingen verhält sich elektrophoretisch verschieden von der Malatdehydrogenase aus der Cytoplasmafraktion.

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This work is supported by a research grant from the University of Hong Kong.     

Effects of sleep and arousal on the processing of visual information in the cat

Single units in the cat lateral geniculate nucleus and primary visual cortex show changes in both spontaneous and visually evoked firing as a function of the state of wakefulness. On arousal spontaneous firing is smoother and often reduced, whereas evoked responses are usually enhanced; the result is an increase in the signal-to-noise ratio. Single- and double-label 2-deoxyglucose autoradiographs show further that slow-wave sleep differentially depresses visually evoked activity in the deeper layers of the visual cortex.     

Decrease of mast cells in regional lymph nodes in response to allogeneic antigens and syngeneic tumor antigens

Summary The absolute number of mast cells in regional lymph nodes decreases on the 5th day after stimulation by allogeneic lymphocytes and semisyngeneic leukaemic cells, despite the enlargement of stimulated lymph nodes. It is postulated that the reaction of lymphatic mast cells could be a sensitive test for tissue incompatibility, and probably also for the presence of tumor associated antigens.