• Volume 43, Issue 2

      February 1956,   pages  89-161

    • Muscular contraction and relaxation

      Sunita Inderjit Singh Inderjit Singh

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    • The life-history ofPuccinia romagnoliana maire and SACC

      T S Ramakrishnan N V Sundaram

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      The complete life-history ofP. romagnoliana a common rust onCyperus rotundus has been worked out. The rust is found to be heterœcious andIpomæa rumicifolia andI. pestigridis are the alternate hosts. Aecia of more than one species of rusts are found to occur on this host genus.

    • The bearing of certain recent cyto-genetical findings on sugarcane breeding

      T S Raghavan

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      In sugarcane breeding the appropriate species ofSaccharum and in certain cases of different genera, have been utilised to suit the needs of the various cane-growing regions. The Coimbatore Station for instance has paid increasing attention to the utilisation ofS. spontaneum while the Station at Canal Point, Florida, has utilisedS. robustum. TheSpontaneum Expedition Scheme is in furtherance of this objective.

      The cyto-genetical basis for the (seemingly capricious) breeding behaviour of sugarcane, has been briefly indicated. Parthenogenesis and chromosome elimination coupled with cytoplasmic inheritance, seems to indicate the greater importance which has to be bestowed upon the pistillate parent in sugarcane breeding. The constitution of some of the important economic seedlings, has been explained from this point of view.

    • A comparative chemical study of flue-curing and shade-curing of virginia tobacco

      A S Sastry

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      In order to study the biochemical peculiarities of flue-curing and air-curing a flue-cured type of leaf was subjected to both the systems of curing.

      During the first 40 hours which corresponded to the yellowing stage in flue-curing, the leaf was at a higher temperature and humidity in flue-curing than in shade-curing.

      This resulted in hastening of chemical reactions in flue-curing as compared to shade-curing. The leaf was completely yellow at the end of 40 hours in flue-curing, while it was only 75% yellow at the end of 123 hours in shade-curing. Also there was greater hydrolysis of starch, more production of sugars and finally greater loss of solids in flue-curing than in shade-curing.

      The contribution of carbohydrates to respiratory losses in the early stages was more in flue-curing than in shade-curing, showing thereby that more of other constituents than carbohydrates contributed to these losses in shade-curing.

      Probably because of this there was considerable loss of nitrogen under shade-curing while the changes in this constituent during flue-curing were insignificant.

      The present study thus tends to show two facts.

      1. Due to higher temperature in flue-curing the chemical reactions are hastened as compared with shade-curing.

      2. Even in flue-cured leaf, some reactions characteristic of air-curing occur, if it is subjected to air-curing.

    • Studies on the nutrition of urban population groups

      K Dakshinamurti S C Devadatta

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      A diet survey has been carried out in Vellore town. The survey included 507 families divided into 11 groups.

      The caloric intake for the poorest section is appalingly low. Protein and fat intakes are also extremely low. The diet of the poor classes is generally deficient in quality as well as quantity. It is not only a question of lack of vitamins but also of fats, proteins, minerals and even caloris.

      The amino acid pattern of the diets of poor people is discussed in relation to its possible role in producing liver injury.

    • The enzymes of some elasmobranchs from Bombay - III. Amylases ofScoliodon sorrakowah andSphyrna blochii

      D S Ghanekar D V Bal Sohoni Kamala

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      1. InS. sorrakowah andS. blochii amylolytic activity is maximum in pancreas, minimum in intestine, muscle, heart and brain, intermediate in liver, spleen and kidney and absent in stomach and ampullæ of lorenzini.

      2. Pancreas and liver of both the fishes and pig pancreas containα-andβ-amylases. Kidney amylase is anα-amylase and spleen amylase is aβ-amylase.

      3. InS. sorrakowah and pig there seems to be probable interconversion of pancreaticα-amylase ⇋β-amylase under the influence of Ca++.

      4. Both water and aqueous glycerol are equivalent extractants of enzyme. Desmo-amylase seems to be predominantly ofα-type and lyoamylase ofβ-type.

      5. Pancreatic lyo-amylase of both the fishes shows the presence of proamylase.

    • Developmental studies ofPhyllanthus niruri Linn. andP. Reticulatus Poir. (Euphorbiaceæ) with special reference to the origin and nature of axillary vegetative buds

      G P Majumdar Arshad Ali

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    • Erratum

      Jagadananda Ghatak

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