Hepatic acid hydrolases of albino rats, Mastomys natalensis and albino mice during Plasmodium berghei infection

Changes in liver acid hydrolase activities during the infection of albino rats, Mastomys or mice with Plasmodium berghei are described. B-Glucosidase, B-galactosidase and N-acetyl-B-D-glucosaminidase exhibited widely different responses with acid phosphatase and cathepsin-B the least responsive and are likely to be causally related to immunity of animals.     

γ-Glutamyl-transpeptidase in lymphatic tissues ofMastomys natalensis during an infection withAcanthocheilonema viteae

Summary DuringAcanthocheilonema viteae infection, the specific activity of -glutamyltranspeptidase (-GT) increased in peritoneal exudate cells and bone marrow and decreased in lymphnodes ofMastomys natalensis throughout the course of infection. However, though there was an increase in specific activity of -GT in thymus and spleen during the prepatent phase ofA. viteae infection, the level either returned to normal or decreased during the latent phase of infection. A close correlation was observed between the host's immune status duringA. viteae infection and the level of -GT in lymphoid tissues.Communication No. 4535 from Central Drug Research Institute, Lucknow.     

Inhibition of thiamine synthesis by vitamin B12 in wild strains ofEscherichia coli

Zusammenfassung Zusatz von Vitamin B₁₂ in Kulturnährböden hemmt die Thiamin-Biosynthese von frisch isoliertenE.-coli-Stämmen. Diese Hemmung steht im Verhältnis zur zugesetzten Menge von Vitamin B₁₂.     

Feeding habits and physiology of digestion of certain leafhoppers homoptera: Jassidae

Zusammenfassung Die ZikadenEmpoasca kerri undE. devastans saugen in erster Linie den Saft des Mesophyllgewebes, währendTettigella spectra undParabolocratus porrectus sich hauptsächlich vom Phloemgewebe ernähren. Bei den mesophyllfressenden Formen sind folgende Fermente vorhanden: Amylase, Maltase, Invertase, alkalische Proteinase, Polypeptidasen, Chlorophyllase und allein beiE. kerri Lipase. Die Phloemfresser besitzen nur Maltase, Invertase und Polypeptidase.     

Electrometric studies on the reaction between thorium and alkali tungstate

Zusammenfassung Es wurde die Reaktion zwischen Th⁴⁺ und WO₄ ^2–-Ionen durch amperometrische, pH und konduktometrische Titrationen zwischen Th(NO₃)₄ und Na₂WO₄ untersucht. Elektrometrisch konnte bewiesen werden, dass sich zwischen pH 4.50–5.75 normales Thoriumtungstat ThO₂ · 2WO₃ bildet.     

Oenocytes of poultry liceLipeurus lawrensis tropicalis Peters (Phthiraptera: Ischnocera)

Summary Oenocytes ofLipeurus lawrensis tropicalis Peters, an ischnoceran Mallophaga (Sens. Lat. Phthiraptera) occur either singly or in clusters of 2–6, and do not exhibit any changes in the different stages of nymphs and adults of the 2 sexes.Acknowledgment. Thanks are due to Head of the Zoology Department Banaras Hindu University, for laboratory facilities and to State Council of Science and Technology, U.P. for financial assistance under the grant No.SCST/4779/BHU (43)/77     

Superconductivity on the border of itinerant-electron ferromagnetism in UGe2

The absence of simple examples of superconductivity adjoining itinerant-electron ferromagnetism in the phase diagram has for many years cast doubt on the validity of conventional models of magnetically mediated superconductivity. On closer examination, however, very few systems have been studied in the extreme conditions of purity, proximity to the ferromagnetic state and very low temperatures required to test the theory definitively. Here we report the observation of superconductivity on the border of ferromagnetism in a pure system, UGe2, which is known to be qualitatively similar to the classic d-electron ferromagnets. The superconductivity that we observe below 1 K, in a limited pressure range on the border of ferromagnetism, seems to arise from the same electrons that produce band magnetism. In this case, superconductivity is most naturally understood in terms of magnetic as opposed to lattice interactions, and by a spin-triplet rather than the spin-singlet pairing normally associated with nearly antiferromagnetic metals.