Effect of a mitogenic concentration on membrane glycoconjugates of human lymphocytes

Periodate oxidation of human peripheral blood lymphocytes followed by reduction with 3H labelled sodium borohydride and acidic hydrolysis generates N-AN 7, glycerol and propane 1-2 diol. This indicates that sialyl, fucosyl and probably galactosyl residues are oxidized by periodate. Neuraminidase-treated lymphocytes exhibit decreased N-AN 7 levels, increased N-AN 8 levels and increased glycerol levels. Such results were neither found with mouse splenocytes nor with calf lymph node cells.     

Ferns of Rajasthan-behaviour of chlorophyll and carotenoids in drought resistance

Summary The relationship of chlorophylls and carotenoids with drought resistance has been studied in some of the ferns found in Rajasthan, without heating as well as after heating the fronds at 60°C. The xerophytic species showed lesser degradation of chlorophyll and exhibited higher carotenoid contents.     

Acid phosphatase activity of cytolytic T cells during cytolysis].

The localization of Golgi areas, particularly lysosomal bodies detected by their acid phosphatase activities, has been determined in the cytotoxic lymphocytes conjugated to their target cell. The study points out the preferential situation of these organelles close to the contact area between the two cells during the target cell lysis.     

Increase in the total reducing substances in the hemolymph of the freshwater crab,Barytelphusa guerini,produced by a pesticide (DDT) and an indolealkylamine (serotonin)

Summary DDT and serotonin produced significant increases in the total reducing substances in the hemolymph of intact crabs,Barytelphusa guerini, apparently by triggering release of the hyperglycemic hormone.     

Enzymatic oxidation of xanthobilirubic acid

Summary Xanthobilirubic acid (XBR) undergoes enzymatic oxidation in the presence of horseradish peroxidase and tertbutyl hydroperoxide to give cleanly methylethylmaleimide (1) and 5-formyl-2,4-dimethyl-1H-pyrrole-3-propanoic acid (2).The authors wish to thank the National Science Foundation (NSF CHE 79-10133) and the National Institute of Child Health (HD 09026) for generous support of this work.     

Follicles development in the foetal human ovary.

In the foetal human ovary, diameters of oocyte and follicle, as well as those of oocyte and nucleus, are found to be positively and linearly correlated with each other. Follicle diameter and number of granulosa cells also show a positive and linear relationship. Finally, in all ovaries examined, from 5 months after conception onwards, small antral follicles were assessed.     

Penetration of oximes across the blood-brain barrier. A histochemical study of the cerebral cholinesterases reactivation.

The comparison of the effects of 4 oximes upon the cerebral cholinesterases reactivation after intoxication with paraoxon shows that the best results are obtained with toxogonine and 1574 [(carbaldoxime-4 pyridinium)-1(methyl-1 imidazolium-3)-3 propane]. The reactivation power of this latter compound seems due to the ease with which it can pass through the blood-brain barrier.     

Octopus chromatophores accumulate nickel

Summary Microprobe analysis of the pigment granules in the superimposed chromatophore layers ofOctopus vulgaris reveal rising amounts of calcium, nickel and sulfur as the size and electron-density of the granules increases. The colours, associated with these increases, shift from yellow/orange to red and finally black.This work was prepared while A.P. was on study leave in Germany supported by the Deutscher Akademischer Austauschdienst.