Volume 51, Issue 6
June 1960, pages 249-287
pp 249-254 June 1960
1. In frog’s heart, on electrical stimulation, more acetylcholine per g./wt. is liberated from the lower half of the ventricle which is free from ganglion cells, than from the rest of the heart which contains ganglion cells. This suggests that acetylcholine mainly originates from the muscle cells.
2. The acetylcholine per g./wt. content of the ganglion free portion of the ventricle is greater than the rest of the heart which contains ganglia. This shows that acetylcholine is also contained in muscle cells besides nerve cells.
pp 255-263 June 1960
pp 264-269 June 1960
A spoiled canned fish, imported from Scotland, was examined and the spoilage was found to have been caused by a cocci type of bacterium. The bacterium was brought into pure culture, studied for its morphological, cultural and physiological properties and on the basis identified asStreptococcus thermophilus Orla-Jensen. Its ability to cause spoilage was proved by inoculating it into freshly processed fish cans. The strain was resistant to heat up to 205° F. and it failed to grow at 20° C. On its temperature relationships, explanation has been offered for its spoilage under Indian conditions and its inactivity under the conditions obtaining in the country where it was packed.
pp 270-275 June 1960
The floral anatomy ofErythroxylum coca, E. mooni andE. monogynum and the embryology of the two latter species have been studied.
The sepals are three-traced and the sepal laterals arise conjointly. The petals are appendaged and single-traced. Obdiplostemony is present inErythroxylum coca andE. mooni. The ovule in the fertile loculus receives a pair of traces from the two plexes formed by the ventrals of the fertile and sterile carpels.
The tapetum is of the secretory type. The tricolporate pollen grains are two-nucleate at the shedding stage.
The ovules are crassinucellate, bitegmic and anatropous. An endothelium differentiated from the innermost layer of the inner integument surrounds the embryo-sac which develops according to the Polygonum type.
pp 276-279 June 1960
pp 280-287 June 1960
Microctonus indicus, new species, is a braconid parasite of the adults ofPhyllotreta cruciferæ attacking various vegetables in Delhi and other places in India. This is the first record of the genusMicroctonus Wesmael from the Indian sub-continent. The biology and behaviour of the adult parasite has been briefly described and discussed in this paper and the immature stages have also been described.