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PublicationArticle Observations on the effect of gonadal and adrenal cortical steroids upon thyroid gland in hypophysectomized catfish, Mystus vittatus (bloch)(1969) T.P. SinghThyroid activity in response to graded doses of various gonadal and adrenal cortical steroids was studied in hypophysectomized catfish, Mystus vittatus. There was a steep fall in thyroidal radioiodine uptake within 5 weeks after hypophysectomy. Estrogen (15 μg/fish) and progesteron (20 μg/fish) treatments restored thyroidal activity to the level of control; whereas testosterone administration not only helped in restoring the normal activity but raised it about twice to that of control. Amongst three adrenal cortical steroids (hydrocortisone, deoxycortisone, and cortisone) tested, only cortisone (10 μg/fish) was potent enough to restore the thyroidal activity to the level of control. It appears that increased thyroid activity, in response to gonadal and adrenal steroids is independent of pituitary mediation. © 1969.PublicationArticle Perpetuation of Taphrina maculans Butler, the Incitant of Turmeric Leaf Spot Disease(1967) Rajendra Upadhyay; M.S. Pavgi[No abstract available]PublicationArticle PublicationArticle Petrology of the Pre-Cambrian Kolhan formations of Jhinkpani, Singhbhum district, Bihar(Springer-Verlag, 1964) A.K. Bhattacharya; B.K. ChatterjeePre-Cambrian Geology of an area of about 14 sq. miles has been investigated in this paper. The oldest rock is a very small patch of serpentinite, tentatively correlated with the huge ultrabasic body at Jojohatu, some 10 miles north. Granite and Newer dolerite are intrusive rocks of the area. Kolhan series, resting unconformably on Granite and showing facies variation from basal sandstone conglomerate to phyllitic shale through sandstone and impersistent limestone in a thickness of only a few tens of metres, is a shallow epicontinental deposit. Kolhan sandstone, rich in hematitic cement, is an argillaceous orthoquartzite practically devoid of feldspar and is very poor in heavy and accessory minerals. It is richly current bedded, immature, bimodal, fine grained, positively skewed and well sorted. Kolhan limestone is recrystallized micrite, its lower horizon is mostly high grade and contains pink calcite and quartz crystals in cavities. Its upper horizon is low grade, phyllitic and argillaceous and is partly metasomatic and exhibits contemporaneous deformation structures like hassock bedding and slickenside (slickolites?). Kolhan phyllitic shale exhibits effects of Singhbhum orogeny in development of cleavage and crumpling of foliation. Dirty green vug quartz contains abundant oriented microscopic chlorite inclusions. Non-metallic and metallic mineralization in Kolhans is represented by limestones, and local hematite-molybdenite and iron-rich manganese ore respectively. © 1964 Ferdinand Enke Verlag Stuttgart.PublicationArticle Thyroid‐gonad relationship in spotted munia, Uroloncha punctulata(1965) J.P. Thapliyal; S.K. PandhaThyroidectomy of adult Spotted munia (Uroloncha punctulata) leads to the gonads remaining permanently in full breeding condition and is responsible for an early increase in testis size and activity in juvenile birds. These effects may be due to (i) general disturbances in metabolism or (ii) continuous secretion of gonadotropic hormones from the hypopyhsis or (iii) to both of these processes. Copyright © 1965 Wiley‐Liss, Inc., A Wiley CompanyPublicationArticle Quantitative separation of calcium, strontium and phosphate(1968) N.S. Chickerur; T.S.B. Narasaraju[No abstract available]PublicationArticle Recrystallization and grain growth observations in thin films of lead and palladium in the electron microscope(1969) O.N. SrivastavaRecrystallization and grain growth, resulting from electron beam heating of local small areas inside an electron microscope, in thin polycrystalline films of lead and palladium have been studied. Large single crystal grains are found to result in this mode of annealing. The present observations seem to be unusual since it is known that, unlike bulk specimens, little or no recrystallization or grain growth occurs when thin metal films are annealed. It is suggested that the recrystallization and grain growth in this case are assisted by thermal stresses which are set up as a result of local heating, and are thus different from those resulting from direct annealing treatment. © 1969.PublicationArticle Structure And Growth Of A New Polytype Of Cadmium Iodide 22H(1962) O.N. Srivastava; A. Ajitram VermaA 22-layered now polytype of cadmium iodide, designated as 22HC. with unit cell dimensions a = 4.24 A, c = 75.18 A has been discovered. The detailed structure of the polytype has been worked out. It is shown that this polytype is based on a 2H ideal structure. The polytype 22HC is so far the largest of the cadmium iodide polytypes whose detailed structure is known. The growth of the polytype lias been discussed in terms of screw-dislocation theory and the difficulties which arise in this are pointed out. © 1962, Walter de Gruyter. All rights reserved.PublicationArticle Gain stability in high-current photomultipliers at high variable counting rates(1967) A.K. Gupta; N. NathVariations in the gain of 56AVP photomultiplier tubes is studied by changing the counting rates. It is observed that at high counting rates the gain of a photomultiplier tube appreciably increases with increasing counting rate. The energy resolution of the photomultiplier tube is found to deteriorate at high counting rates. It is found that this gain shift is nearly eliminated by keeping the voltages stabilized for the last two stages of the photomultiplier chain. This also helps in maintaining the energy resolution. © 1967.PublicationArticle A new Chromosome Number in Nitella Tenuissima (Desv.) Kütz. Em. R.D.W.(1967) Y.S.R.K. Sarma; Ramjee[No abstract available]