• Volume 19, Issue 4

      April 1944,   pages  91-146

    • Adaptation or accommodation in unstriated muscle

      Inderjit Singh

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      1. There are two kinds of adaptation to alternating current. During one, the sensitivity to potassium decreases, and during the other, it increases. One is probably produced by calcium, and the other by ions outside.

      2. There are two kinds of adaptation to chemical stimulation; one is similar to the first kind of adaptation to A.C. and the second one is probably due to diffusion of ions into the muscle fibres. This kind of adaptation also occurs to A.C.

      3. Adaptation may be diminished by (a) leakage of the adaptation factor, (b) neutralisation of the same or (c) or inhibition of adaptation. This last appears to be responsible for tonic withdrawal contractions.

      4. Adaptation increases with length.

      5. Adaptation and fatigue are identical.

    • A contribution to the life-history ofSonerila Wallichii Benn

      K Subramanyam

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      An account of the life-history ofSonerila Wallichii with reference to microsporogenesis, megasporogenesis and embryogeny is presented in this paper. The chromosome number as determined in the pollen mother cells is eight. The ovules are bitegumentary with mostly a single and rarely multiple archesporium. Further developmental stages of the multiple archesporium to double tetrad stages have been noticed. A hypostase-like tissue at the chalazal region is prominently seen. The development of the embryosac conforms to the normal 8-nucleate type.

      Endosperm is nuclear and the type of development of the embryo is akin to theCapsella-type. The basal cell of the suspensor divides by vertical walls and forms a vertical group of six cells. Some of these might further develop into groups of cells resembling multiple embryos.

    • Blood urea clearance of mysoreans

      C Srikantia D Shamanna

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      1. The average blood urea clearance of 57 normal Mysoreans between the ages of 19 and 28 years is determined adopting the technique of Molleret al.

      2. Urea is determined by the xanthydrol micro method.

      3. The averageCm is 46·83 c.c. andCs 35·95 c.c. after correcting for the body surface to 1·73 m2.

      4. These values are low as compared with the corresponding figures for Americans but compare favourably with the figures of Gokhale obtained for Indians of the Bombay Presidency.

      5. Low protein content of the diet appears to be the chief factor for the low urea clearance.

    • The effect of temperature and ions on the impedance of unstriated muscle and its relation to permeability and excitability

      Inderjit Singh Sunita Inderjit Singh

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