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Transactions of the Bose Research Institutecalcutt

1951

which leads to change in ionic concentrations on the two sides of the muscle fibre membrane probably a change in the relative concentration of the divalent ions Ca++ and Mg++ to the monovalent ones like K+ and Na+ (iii) the increased concentration of the divalent ions on the surface of the actomyosin fibrils start the reaction between actomyosin and ATP. [...] As in the case of animal receptor organs this part of the mechanism is not well understood ; (ii) for the production of curvature of the coleoptile presence of auxin is necessary ; (iii) the curvature produced is related to the direction of the bioelectric field produced by the external agency and is otherwise not influenced by the latter ; (iv) according to the findings of Dolk (28) gravity ha [...] We propose the following picture of the role of IAA in the production of tropic curvature in growing coleoptiles :— (i) By the action of an enzyme on tryptophane which is formed in the growing region of the stem IAA is produced. [...] (v) The tropic curvature produced is due to a modification in the concentration of IAA on the two sides of the coleoptile in the electric field induced in the plant part by the external stimulating agent; on the positive side the cocentration is higher than on the negative side. [...] We assume as before that the rates of the reactions (a) and (b) depend upon the nature of the ionic concentration at the surface of the plasma membrane and the passage of the excitation current produces such changes in concentration that the process (b) is retarded relative to (a).
technology medicine science
Pages
140
Published in
India
SARF Document ID
sarf.140608
Segment Pages Author Actions
Frontmatter
i-iii D.M. Bose view
I. Tropic Diurnal and Irritability Responses in Plants. a Physico-Chemical Theory
1-22 D.M. Bose view
II. X-Ray Studies in Jute II. a Comparative Study of the Germination Percentage Size Andexternal Morphology With Different Doses of X-Rays
23-30 K.T Jacob view
II. The Structural Basis of Sensitivity in Mimosa Pudica Linn
31-46 Mridula Dutt, J.C. Bose view
IV. Periodicity in Plant Growth
47-70 A.Guha Thakurta view
V. Microfossils from the Cambrian Strata of the Saltrange Punjab
71-ii A. K. Ghosh view
VI. Utilization of Freshly Harvested Potato Tuber in the Cultivation(As Seed)
79-98 B.K Dutt view
VII. Biological Effect of Ultrasonic Radiations Effect on Plant Root Tips
99-ii Sunanda Bose view
VIII. Separation of Inorganic Salts by Paper Chromatography Part III. Separation of Uranium Thorium and Rare Earthby Partition Chromatography on Filter Paper
105-114 B. Sarma view
IX. On the Identification of W and -Mesons by the Method of Momentum Loss
115-122 A.M Ghosh view
X. Autonomous Pulsatory Movement of the Leaflet of Oxalis Repens Thunb
123-128 B.K Dutt, A. Thakurta, Mridula Dutt view

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