Alkaloids ofaspidosperma melanocalyx muell-arg

Zusammenfassung InA spidosperma melanocalyx wurde N-Acetyl-16, 17-dihydroxy-aspidospermin (Desmethylaspidocarpin) gefunden sowie dessen durch oxydative Dimerisierung entstandenes Produkt. Die Strukturaufklärung basiert auf physikalisch-chemischen Methoden.     

Crepitin,a phytohemagglutinin fromHura crepitans

Zusammenfassung Aus dem Saft des BaumesHura crepitans wurde eine Fraktion gewonnen, die wahrscheinlich ein Lipoglykoprotein ist und hämagglutinierende und toxische Eigenschaften besitzt.     

Sex attractant of the larch bud moth found by electroantennogram method

Zusammenfassung Mit Hilfe der Antennogramm-Methode wurdetrans-11-Tetracedenylacetat als spezifisches Attraktans für Männchen des LärchenwicklersZeiraphera diniana bestimmt. In geeigneter Konzentration ist die Attraktivität der synthetischen Substanz derjenigen virginer Weibchen ebenbürtig.

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This research was supported in part by Environmental Protection Agency Grant No. EP-00802 and by the Rockefeller Foundation.

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Contribution No. 46 of the research team for the investigation of the population dynamics of the larch bud moth, directed by Professor Dr.P. Bovey. The research was aided by the Swiss National Funds for Scientific Research.     

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.     

Bacillus thuringiensis delta-endotoxin: evidence that toxin acts at the surface of susceptible cells

Enzymically activated delta-endotoxin of Bacillus thuringiensis covalently bound to Sephadex beads, has the same effect on insect cells in tissue culture as free toxin. The effect is prevented by antitoxin antibody and heat denaturation and is not due to a nonspecific protein effect, the beads, or toxin released from the beads. The toxin, therefore, probably acts at the cell surface.     

Immunocytology of alpha-endorphin positive hypothalamic fibers of Carassius auratus L. and Cyprinus carpio L.]

An immunocytological study of the basal hypothalamus of Carassius auratus and Cyprinus carpio with an alpha-endorphin antiserum shows the different nerve processes belonging probably to the immunoreactive cells of the lateral part of the N.L.T. According to their pathways, two main fibre tracts have been distinguished: many fluorescent fibres converge towards the pituitary gland into which they enter, other fibres run caudally through the tuber towards the nucleus tuberis inferior (Baumgarten and Braak) where they could not be followed further.