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.     

Trends of karyological evolution in Pelobatoid frogs

Summary The Pelobatids have a basal karyotype of 26 chromosomes, with 6 pairs of large and 7 of small chromosomes (6+7). From this karyotype, shown byLeptobrachium, Pelobates andScaphiopus, those ofMegophrys andSpea (5+8) may be derived, as well as that ofL. pelodytoides, with only 24 chromosomes.Pelodytes has 24 chromosomes and a karyotype 7+5 differing from that of typical Pelobatids under several respects.Research supported by a contribution from the Italian C. N. R.     

Endurance training and antioxidants of lung

Summary Mice and rats were adjusted to daily treadmill training programs, which were heavy enough to increase the oxidative capacity of skeletal muscles. Endurance training did not affect the activities of catalase and glutathione peroxidase and the concentration of vitamin E in the lungs of mice and rats. Thus increased ventilation and oxygen utilization induced by exercise training do not modify lung antioxidants, in contrast to hyperoxia and hypoxia.This study was supported by the Academy of Finland and the Research Council for Physical Education and Sport (Ministry of Education, Finland). We thank Mr Matti Virtanen for skillful technical assistance.     

Alloxan-induced hyperglycemia increases progestin and androgen accumulation by isolated rabbit follicles in vitro

Summary Follicles isolated from Alloxan-treated rabbits and incubated in vitro, accumulated more progesterone and testosterone than those from saline-treated rabbits. LH augmented the accumulation of these 2 steroids. By contrast, the estradiol response to LH stimulation by follicles from Alloxan-induced hyperglycemic rabbits was diminished when compared to follicles from saline-treated rabbits. Ovaries from hyperglycemic rabbits also appeared to have more cystic follicles.This work was supported by the Medical Research Council of Canada. The technical assistance of Misses P. Dimond and J. Osoko is gratefully acknowledged. Dr B.R. Bhavnani provided the stimulus for this study.     

The median procedure for n-trees

Let (X,d) be a metric space The functionM:X ^k 2 ^x defined by is the minimum } is called themedian procedure and has been found useful in various applications involving the notion of consensus Here we present axioms that characterizeM whenX is a certain class of trees (hierarchical classifications), andd is the symmetric difference metricWe would like to thank the referees and Editor for helpful comments     

Rifamycin Y und seine Umwandlungsprodukte

Summary The constitution I has been determined for rifamycin YO. The compound is an oxidation product of rifamycin Y, a metabolite ofStreptomyces mediterranei n. sp.