Volume 54, Issue 3
September 1961, pages 113-168
pp 113-116 September 1961
Influence of age, sex and female sex hormone on alkaline phosphatase activity of rat brain tissue was studied both biochemically and histochemically. No alteration in alkaline phosphatase value due to increase in weights (and age) in either sex of the rats was observed.
The values obtained in male rats were slightly higher than those for females.
The alkaline phosphatase values were slightly higher after ovariectomy. There was no significant rise or fall in these values in rats ovariectomised and treated with the hormone.
Histochemical studies showed weak activity in brain tissue which was not affected by age, sex or the female sex hormone.
pp 117-121 September 1961
The cholinesterase activity of rat brain tissue in relation to age, sex and gonadal hormone has been studied. No significant difference due to the age and sex was observed.
pp 122-129 September 1961
1.Cellana radiata (Bom) uncovered by sea-water at low tides reacts to splashes of sea-water by raising its shell from the position assumed in tight closure. The maximum height reached by the shell decreases with decreasing salinity.
2. Isotonic solutions of NaCl, KCl, Na2SO4, Urea and Sucrose bring about a positive response, but the response is negative in NaHCO3.
3. The animal reacts positively to very low concentrations of NaCl.
4. Animals in which the mantle fringe and tentacles have been removed react differently.
5. The ecological significance of these behaviours is discussed.
pp 130-137 September 1961
1. The presence of peculiarly differentiated bristles on certain oral appendages and on the thoracic tergites in the worker caste ofOdontotermes (O.) assmuthi Holmgren, serving to distinguish it from the workers ofOdontotermes (O.) obesus (Rambur) andOdontotermes (O.) horni (Wasmann) has been reported.
2. The labrum and the lacinia inO. assmuthi carry fewer bristles than inO. obesus andO. horni.
3. On the labium,posterior-postmental bristles (ppmtl.) are absent both inO. assmuthi and inO. obesus, but are present inO. horni.
4. A few pairs of characteristic bristles are distinctly seen on the thoracic tergites inO. assmuthi as well as inO. obesus, but are not to be found inO. horni.
pp 138-144 September 1961
The chromosome number of twenty-eight different medicinal plants have been studied of which twenty-three are reported for the first time. One plant had number different from previous observations.
pp 145-151 September 1961
1.C. padavensis can tolerate wide salinity variations of 1·2‰ to 34‰.
2. Survival rate is maximum in 75% to 25% sea-water, inC. padavensis.
3.C. padavensis maintains its body fluid hypotonic in sea-water and hypertonic in 25% sea-water and further dilutions. Isotonicity between the external medium and body fluid is established in 50% sea-water.
4. The chloride level of the body fluid is maintained more or less constant both in sea-water and distilled water.
5. The actual mechanism of regulation is not yet known, but it is probably by an active retention of chlorides in the body by the animal, coupled with differential permeability of the body surface.
pp 152-168 September 1961