• Volume 74, Issue 1

      July 1971,   pages  1-52

    • Studies on metacercaria of fresh-water fishes of India - VIII. On the morphology ofTetracotyle lucknowensis n. sp. fromChanna striatus (Bloch)

      K C Pandey

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      Tetracotyle lucknowensis is described fromChanna striatus (Bloch). It is characterised by the oval shape of its body, by ratio of suckers and by stupendous size of its hold-fast organ.

    • Studies in the family Scrophulariaceae - III. Floral anatomy of some members of Gratioleae

      T M Varghese

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      The present work deals with the floral anatomy of 20 species of the family Scrophulariaceae belonging to 10 genera of the tribe Gratioleae.

      The sepals are five in number in all the members. The sepals are one-traced, three-traced or sometimes four-traced. The sepals of the same flower may show variation in the number of traces as noted inMacardonia andStemodia. The one-traced condition is assumed to have been derived from three-traced one by the reduction of two lateral traces and four-traced by the duplication of one of the three traces.

      The petals are five in all members and are one-traced. The number of stamens show reduction from five to two. In certain species although the posterior stamen disappeared their ‘vascular stub’ is represented in the respective position. The various steps in reduction from five stamened to two stamened condition can be traced, through intermediary steps.

      The placentation is axile inMazus andMimulus. But inStemodia, Macardonia andDeinostema, the placentation is anatomically parietal at the basal region and parietal in every way at the upper region of the ovary. InDopatrium the placentation is parietal even from the base, inLindenbergia the placentation tends to become parietal.

      The secondary marginals, in the gynoecium also, show a reduction from 8 to 2.

      In all instances irrespective of type of placentation and of the number of vascular bundles or strands the placentae are recognised to be composed of two ‘half placentae’. This is borne from the fact, that the ovules borne on the same placenta, are oriented in two opposite directions.

    • Biological control of cotton wilt - II.In vitro effects of antagonists on the pathogenFusarium vasinfectum Atk

      V Arjunarao

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      Using the antagonistic actinomycetes isolated from theFusarium “wilt-sick” and “wilt-free” cotton field soils it was possible to confirm production of antibiotic substance(s) by them inin vitro studies. They inhibited spore germination and radial growth of the cotton wilt pathogenFusarium vasinfectum Atk. In addition, various adverse morphological changes were brought about by them on the fungal mycelium. Most of the actinomycetes were seen to lyse both live and heat-killed bud-cells of the pathogen. Similar effect was also observed in soilin situ.

    • Ca++/Mg++ ratios in the sediments on the continental shelf off Bombay

      R R Nair R S Murali R M Kidwai

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      Low values of Ca/Mg ratio (4·7–14·0) have been obtained in the skeletal and non-skeletal (oolite) components of the carbonate fraction of the sediments on the continental shelf off Bombay, a terrigenous-carbonate province. Low ratio has been attributed to the greater quantity of magnesium present. The excess magnesium is assumed to be derived from various sources. The principal sources being dolomite and magnesium rich foraminifera and algae. Subsidiary amounts is expected to be contributed by incorporation from the magnesium-rich shelf waters which in turn may have derived the magnesium from dissolution from the sediment and in part by river discharge.

    • Breeding habits, development and life-history ofBlennius steindachneri day from Waltair coast

      N Solomon Raju

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      The breeding habits, development and life-history stages ofBlennius steindachneri are described for the first time. The female lays its eggs in the empty shells ofBalanus tintinnabulum tintinnabulum, in oyster shells and rock crevices and the male guards over the eggs. Hatching of the eggs takes place on 6th or 7th day of incubation and mechanical stimulus helps hatching process. Maturity is reached when they attain a length of about 70·00 mm.

    • Some aspects of molecular mechanism in the regulation of histaminic activity in cell-free systems of sheep brain

      N V Nandakumar Karumuri S Swami

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      The pattern of enzyme activities get altered in the presence of allergic agent histamine phosphate and an attempt to restore the normal pattern of enzyme occurs in the presence of antihistamines suggesting their interactions at molecular level regulating the metabolism. The regulatory effect of these antihistamines are more pronounced in heterogeneous environment at homogenate pH than at optimum pH.

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