Volume 42, Issue 3
September 1955, pages 85-127
pp 85-89 September 1955
pp 90-97 September 1955
In this paper the author has put forward the results of his study of the manganese ore minerals of Jamda Valley under the reflecting microscope. He differs from Dr. Spencer (1948) who suggested that the ores are entirely composed of pyrolusite, and has identified five different manganese minerals under the microscope. These are: Psilomelane, Pyrolusite, Manganite, Polianite and Romanéchite. In addition to the etch reactions and the general optical criteria, the reflectance for each of the mineral was measured and they read as follows:—Psilomelane—23·07, Pyrolusite—32, Polianite—34·4, Manganite—18·5 and Romanéchite—22·7. All these readings were taken in Berek’s slit microphotometer in green light and in air. The psilomelane is the first and principal mineral to be deposited. It exhibits colloform textures and shrinkage cracks and has deposited from a gel. Manganite and polianite, the two minerals showing mutual boundary with each other, were deposited after psilomelane and the manganite occupies the cracks and crevices of psilomelane. Pyrolusite which replaces both psilomelane and manganite is an alteration product and was formed after the manganites, while romanéchite which cuts the psilomelane and the pyrolusite in the form of veinlets, is the youngest mineral to be deposited.
pp 98-104 September 1955
pp 105-113 September 1955
(i) Data are presented on the amino-acid composition of (i) the clear culture filtrate, (ii) the culture filtrate hydrolysate, (iii) the clear cell homogenate, (iv) the cell homogenate hydrolysate, and (v) the insoluble protein mass ofMycobacterium tuberculosis H37Rv at different periods of growth. Data also are presented on the amino-acid composition of the three tuberculin proteins isolated from the culture filtrate of a fully grown culture ofMyco. tuber. H37Rv.
(ii) From among the fractions studied, it is concluded that the cell homogenate and its hydrolysate are most indicative of the amino-acid changes taking place within the cell.
pp 114-122 September 1955
The effects of a Plagiorchid metacercaria upon certain tissues of the snailVivipara bengalensis (Lamarck) have been studied.
In the mantle it would possibly interfere with the normal elastic function of the organ. In the tentacle the cysts are very likely to interfere with the normal sensory function of the organ, the vision of the host and also with the fertilizing power of the male individuals. The cysts in the gill would possibly interfere with the usual course of the blood and also with the normal respiratory function of the organ.
pp 123-127 September 1955