Volume 51, Issue 4
April 1960, pages 157-203
pp 157-163 April 1960
A detailed account of the morphological, staining, penicillin sensitivity and serological peculiarities of five strains of an oxalate-decomposing bacterium including the well-recognized strainVibrio extorquens, has been given. Inasmuch as all the strains share many of the characteristics of the genusArthrobacter and notVibrio the desirability of placing the bacterium in the former genus for the time being has been suggested. The possibility of the strains falling under an altogether new genus which represent a phylogenic link between the pseudomonads and diphtheroids has been speculated.
pp 164-168 April 1960
pp 169-180 April 1960
The paper deals with 38 species under 12 genera of lichens that had been collected by Mr. R. S. Rao, Botanist Member of the Indian Expedition to Cho-Oyu in East Nepal. Five species as new reports for the Himalayas are described.
pp 181-190 April 1960
1. Each testis is followed by two vasa deferentia, which join to form a common vas deferens.
2. The ejaculatory duct opens into the phallus.
3. The ædeagus is a curved organ, bifurcated at the distal end.
4. In the external genitalia of male, the eighth abdominal sternite is reduced; the ninth is represented by spiculum gastrale, whereas the tenth is absent. In the female, the eighth is reduced, the ninth surrounds the genit a chamber, and the tenth is absent.
5. There are two ovaries, the egg tube is acrotropic.
6. The oviducts unite to form the uterus.
7. The spermatheca and the accessory gland join the bursa copulatrix which in turn opens into the genital chamber.
pp 191-194 April 1960
A simplified method for the preparation of silica gel is described. The gel has been found to be useful in enumeratingAzotobacter population in the soil as onlyAzotobacter colonies appeared in the plates containing this gel. It is also possible to obtain pure cultures ofAzotobacter by employing this technique.
pp 195-203 April 1960
Fifty bottom sediment samples of Kakinada Bay have been analysed for their phosphate content with the object of studying the distribution of the different types of phosphates in relation to the mechanical composition, the colour of the sediment and the depth of the bay. It has been found that, the phosphate content of bottom sediments is very low; there is in general an increase in the concentration of total phosphate in northern and western parts of the bay and a decrease of the same in the southern and the eastern parts; the intertidal mud flats are also poorer in phosphates; there is no apparent relationship existing between the mechanical composition and phosphate concentration, or the colour of the sediment and the phosphate concentration and the shallow nature of the bay seems to have no effective controlling influence on the phosphate accumulation. The replenishment of phosphates in the waters from the sediments below does not seem to be appreciable in the case of the Kakinada Bay.