Volume 48, Issue 3
September 1958, pages 1-135
pp 1- September 1958 Erratum
pp 109-113 September 1958
An attempt has been made to differentiate and classify primary and secondary colonies obtained from a trained strain on the basis of their Eh: time curves. It has been concluded that the primary colonies arise from adapted cells while the secondary colonies represent the unadapted injured cells.
pp 114-121 September 1958
pp 122-130 September 1958
The karyotypes of six strains of barley are described and the results have been compared with those reported by Sharma and Mukherji (1956) for the same strains. The findings of the latter authors could not be confirmed in five strains, and the necessity to use critical cytological techniques and adequate number of cells for analysis in such studies is stressed. The role of chromosome structural differences in intra-specific differentiation is pointed out and it is shown that repatterning of the karyotype may sometimes result in genotypes of higher selection and survival value. The probable mode of origin of a pair of minute satellites present in addition to the normal two pairs in the variety B-17 is discussed.
pp 131-135 September 1958
1. Glycerinated frog’s stomach muscle fromRana tigrina does not respond to ATP with contraction. As this muscle responds physiologically like other muscles, this throws doubt on the accepted role of ATP in muscular contraction.
2. In a few glycerinated muscles ATP has produced active relaxation. As the number of positive results is small, they are of doubtful value. But theoretically such a possibility exists as increased metabolism definitely occurs during relaxation.