Volume 50, Issue 2
August 1959, pages 51-111
pp 51-60 August 1959
Protein-fasting for two weeks of rats on the laboratory stock diet results in a decrease in serum level of albumin, and ofα1-,α2- andβ-globulins. The albumin-globulin ratio remains unaltered.
Repletion on a 10 per cent. casein diet with minimal as compared to optimal intake of the B vitamins—thiamine, riboflavin, nicotinic acid, pyridoxine, pantothenic acid, folic acid and vitamin B12—causes a faster restoration of total serum protein but growth is retarded. With minimal intake of the vitamins there is an incomplete restoration of albumin andα1-globulin; an abnormal initial increase inβ- andγ-globulins is followed, upon prolonged regeneration up to two weeks, by a drop in all fractions and in total serum protein. With optimal intake of B vitamins, the fractions attain normal levels at or before two weeks of regeneration. An initial abnormal increase in serumβ-globulin resembles that observed at minimal intake of the vitamins. Following prolonged regeneration there is a drop in albumin and in total serum protein to subnormal levels, which effects are attributable to low level of protein in the diet.
Rats on a basal, vitamin B12 deficient, Bengal gram diet show reductions in blood hemoglobin, serum albumin and in serumα1-,α2-, andβ-globulins upon protein-fasting for one week. The effects are moderated with supplements of vitamin B12 and folic acid to the basal diet. Incidental observations also point to growth-promoting and serum protein-generating effects of the vitamins in the growing rat.
pp 61-74 August 1959
pp 75-81 August 1959
Rhizopus stolonifer (Ehrenh ex. Fr.) Lind. secretes active protopectinase enzyme while attacking the plant tissues. Decoctions of several fruits and vegetables were not found to form suitable medium for the enzyme secretion. Pectin-asparagin medium (without CaCO3) was found to be satisfactory for the enzyme secretion when cultures were incubated at 25°C. for 2–3 days.
pp 82-87 August 1959
The irradiation of eggs and first instar larvæ ofCorcyra cephalonica Stainton with beta radiations from P32 has shown that even a dose as high as 3333 mrep/hr. does not produce any detrimental effect on the subsequent development of the parent as well as the two successive generations. However, the per cent. viability and per cent. successful completion of development in the parent generation are comparatively high with 1111 mrep/hr. dose than with 555, 2222 and 3333 mrep/hr. dosages and the control. Thus it may be concluded that the beta radiations of 1111 mrep/hr. intensity seem to be of stimulating nature for the eggs and larvæ of this insect.
pp 88-104 August 1959
The general histology of the renal units of 20 selected species of teleosts has been given. Besides, an analysis of the glomerular size in a total of 43 species of fish shows good agreement with some of the well-known theories of glomerular development in relation to habitat. This preliminary study has helped to bring out some of the essential lines on which reliable data on the renal physiology of some of the euryhaline fishes have to be obtained and these are briefly discussed.
pp 105-111 August 1959