Volume 30, Issue 5
November 1949, pages 243-306
pp 243-248 November 1949
pp 249-258 November 1949
pp 259-262 November 1949
pp 263-269 November 1949
At 20° C., dog’s stomach muscle shows the first asphyxiai contraction, but not the second.
At 20° C., glucose loses its inhibitory action, but that of oxygen is increased; at higher temperature, the reverse happens.
At 20° C., iodoacetic acid and cyanide also do not produce contraction.
If the second asphyxiai contraction is prevented mechanically or if developed, is abolished mechanically, then the power to contract on asphyxiation is permanently lost. Twitch contractions can be produced, but not tonic contractions. This suggests a separate contractile mechanism for tonic contraction (alactic tone).
pp 270-278 November 1949
pp 279-283 November 1949
pp 284-290 November 1949
Pretreatment of cement plates with potassium dichromate/glue mixture increases the persistence of DDT. On the other hand, pretreatment with linseed oil appears to have a slight reverse effect.
pp 291-298 November 1949
The mature sclereids occurring in ten Indian species ofMemecylon are presented in this paper. They are terminal in position in relation to the ends of the veinlets. The different types of sclereids are described in detail. They serve a mechanical function to some extent. Their probable importance in building up a key for species ofMemecylon on the basis of vegetative structures is pointed out.
pp 299-306 November 1949
The liver oils of six varieties of fish have been analysed for their Vitamin A content biologically as well as tintometrically. Great variation in the Vitamin A content is observed when the biologically obtained values are compared with those obtained by colorimetric method. Though it is not possible to draw any definite relationship between the yellow colour of the oil and its Vitamin A content, it can be noticed to some extent that a decrease in the percentage of Vitamin A is accompanied by an increase in the red colour of the oil.
The ratio I.U./Carr Price Blue Units for the liver oils studied vary from oil to oil indicating that greater discrepancies are likely to be met with if a uniform conversion factor is applied to the Blue values obtained with oils from the livers of different species of fish. It is suggested that as far as possible, whenever a new source of Vitamin A is found it should be subjected to all the three methods of assay before applying any factor to convert the colorimetric or spectrophotometric values into the International Units of Vitamin A. For a rough estimate of Vitamin A in industry a suggestion to take the factor 3 for converting Blue values into the International Units is made. Bomskov factor 4·2 is misleading in the case of liver oils of fish in India.