• Volume 55, Issue 3

      March 1962,   pages  107-161

    • Congenital malformations in the chick caused by environmental variation

      Sarah J Souri V Swani

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      An enquiry was undertaken to determine the various types of anomalies which might occur in the chick embryos by subjecting the incubating eggs to insulin injection. Since the injection of insulin above 4 units resulted in lethality, 4 units of insulin was introduced by injection throughout the experiments.

      The abnormalities are classified as relating to the skeletal, reproductive and the nervous systems. Micromelia, micrognatha and other beak deformities, congenital fracture in the limbs, rotation of joints relate to skeletal anomalies. Dilatation of the right oviduct was observed in one instance. Gonadal degenerative changes were observed in all the experimental chicks examined. Meningo-encephalocœle, unilateral-microphthalmia with herniation of brain and bilateral microphthalmia accompanied by absence of the upper beak were the anomalies reported in these experiments. Macroscopic as well as microscopic appearances of these abnormal chick embryos are discussed and illustrated with the help of photographs and microphotographs.

    • Notes on fungi from Rajasthan—I

      N Prasad R N S Tyagi J P Agnihotri

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    • Studies in the pectic enzymes of parasitic fungi - IV. Production of protopectinase enzyme byFusarium orthoceras APP. and Wr. var.ciceri padwick on synthetic media

      M N Gupta

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      1. Production of protopectinase enzyme byFusarium orthoceras var.ciceri was studied on various synthetic media along with various factors responsible for its production.

      2. The fungus secreted most active enzyme on the following medium—0·5% cellobiose, 1·5% pectin, 0·389% ammonium oxalate, 0·1% KH2PO4 and 0·05% MgSO4. 7H2O.

      3. Optimum incubation period for the secretion of active protopectinase enzyme was four days when cultures were incubated at 25° C.

      4. Cellobiose was found to be the best carbohydrate for the secretion of protopectinase enzyme. Arabinose, lactose, starch and maltose were not suitable for the enzyme production.

      5. Optimum enzyme secretion was not related with the amount of growth of the fungus.

      6. Asparagin and ammonium salts, as compared to nitrates, were more suitable for the enzyme production.

      7. The production of protopectinase enzyme was better in the presence of pectin.

    • Chromosome relationship inCalendula species

      E K Janaki Ammal S N Sobti

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      A new basic numberx=11 for the genusCalendula is reported for the first time inC. persica 2n=44 from Jammu. Its chromosome relationship withC. suffruticosa 2n=28,C. officinalis 2n=32 andC. arvensis 2n=32 are discussed. As inNarcissus the tetraploidy inCalendula provides the best form suitable for cultivation as garden plant.

    • Studies on Indian charophytes - I.Lychnothamnus

      V S Sundaralingam

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      The structure and development of the stem, branchlets, the branch, cortex and stipulodes inLychnothamnus are described in detail. In general, they resemble those ofChara.

      Development of the gametangia was followed very carefully. It resembles very closely that of the gametangia ofChara. With regard to their origin, both the antheridium and the oogonium arise from different peripheral cells and take the place of bracts, contrary to the view expressed by Migula (1897).

    • Oxygen consumption in relation to body weight and oxygen tension in the prawnPenaeus indicus (Milne Edwards)

      C B Subrahmanyam

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      An account of the investigation on the oxygen consumption of the immature forms ofPenœus indicus (M. Edw.) in relation to the body weight, partial pressures of oxygen in the external medium and the minimum survival levels as regards oxygen content in water is given.

      An exponent value of 0·604 has been recorded. The consumption of oxygen of prawns of different weights is related to the partial pressures of oxygen in the medium. The lethal levels are weight-specific and hold a linear relationship with the body weight on a double logarithmic grid. Observations made here are compared and discussed with earlier accounts.

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