• Volume 82, Issue 4

      October 1975,   pages  127-166

    • Stability inPyricularia oryzae Cav.

      J Veeraraghavan

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      Shift in pathogenicity—pattern from race IC 1 to that of IC 17 could be noticed in the seven isolates of the pathogen,Pyricularia oryzae Cav. belonging to the former group consequent to storage. Seven isolates of the pathogen belonging to the race IC 17 did not reveal shift in their pathogenicity-pattern. Stability/instability pattern of isolates of the pathogen belonging to the races IC 1 and IC 17 did not vary with the different types of storage methods adopted.

    • Antitumor immunity in rats against Yoshida ascites sarcoma after treatment with antibiotics

      R Nayak M Sirsi

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      Chromomycin A3, mithramycin, olivomycin and actinomycin D, four antitumor antibiotics inhibit growth of Yoshida ascites sarcoma (YAS). The antibiotic treated tumor-free rats exhibit antitumor immunity as judged by rejection of subsequent tumor transplant. The lymphocytes from immune rats are able to inhibit tumor growth in syngenic animals.

    • Oogenesis inAcanthosentis oligospinus n.sp., an aganthocephalan parasite of the fish,Macrones gulio - 1. The morphology of the oocyte and distribution of the nucleic acids

      Sita Anantaraman T Subramoniam

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      The morphology of the ovarian ball with its constituent oocytes ofAcanthosentis oligospinus n.sp., has been studied. The distribution of RNA materials in growing oocytes suggests their origin in the nucleolus. Based on the sequential distribution of RNA granules, a classification of growing oocytes has been attempted.

    • Ultrastructural studies of the granulosa and the diencephalic ependyma in rats

      K Chandrasekhar

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      Light microscopy observations during the proestrous show the basal granulosa to be regularly arranged with a clear demarcation line between it and the underlying theca interna. Further, it was noticed that the granulosa has a smooth contour towards the antrum. On the other hand during the estrous period the demarcation line becomes strikingly irregular and the inner contour becomes wavy, striking a close resemblance to the intestinal ‘villi’.

      Under the EM during the proestrous, the Golgi bodies appear well developed. In addition, coated vesicles, ribosomes and dense bodies are also discernible. But during estrous period the granulosa cells exhibit considerable accumulation of lipid droplets and peculiar complex bodies make their appearance. The endoplasmic reticulum becomes well delineated.

      Light microscopy observations of the ependyma show that it is attached to the sub-ependymal region but there is no basement membrane and the cells bear tufts of cilia on the luminal side. During the estrous period, the cells are seen to contain darkly staining bodies, while in the ovariectomised rats, the ependyma is clearly seen to detach itself from the sub-ependymal region. The detached ependyma is more than one layered.

      Under the EM, the ependyma of rats in proestrous were seen to contain a few dense bodies, mitochondria and endoplasmic reticulum. A few neuronal processes extending into the lumen were detectable. During the estrous, there was increase in the number of vesicles and mito-chondria and the cytoplasm became finely granular. The striking difference was seen in the widening of the intercellular space below the zonula adherens and zonula occludentes and this space getting filled with processes of neuronal origin.

      In the castrated rats, the cell got filled with fine filaments obliterating the detection of other structures.

    • Diorites from Kuderu and Atmakuru areas, Anantapur District, Andhra Pradesh

      G Lakshmi Reddy M S Murty

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      Diorites are mainly of two types—hornblende diorites and biotite diorites having transitions between them. The former possesses panidiomorphic and the latter allotrimorphic texture. Hornblende diorite is considered to be a magmatic rock and the biotite diorite is formed by assimilation of the hornblende diorite by granite magma.


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