Volume 77, Issue 5
May 1973, pages 181-224
pp 181-185 May 1973
Proliferation in the genusCymbopogon is reported by the authors in several clones, ofC. flexuosus, C. jwarancusa andC. khasianus. Role of this phenomenon in plant propagation is also discussed.
pp 186-189 May 1973
pp 190-195 May 1973
The gonadal and interrenal steroid ofRana hexadactyla, Rana cyanophlyctis, Rhacophorus maculatus andCalotes versicolor have been analysed by paper chromatography. In the interrenal of both the sexes of three species of frogs studied, aldosterone and corticosterone could be detected. In the testes of all the three species of frogs studied, testosterone was significantly absent; progesterone and 17β estradiol were detected. In the ovary 17β estradiol. estriol and progesterone were identified. In the adrenals ofCalotes, as in frogs, corticosterone and aldosterone were noticed. In the testis testosterone and 17β estradiol were detected; in the ovary progesterone, estriol, estrone and 17β estradiol were found. The significance of the presence of testosterone and the absence of progesterone in the testes is discussed in the light of biosynthetic pathway known in other forms.
pp 196-201 May 1973
The isolation and identification of capsaicin from fruits yielded two substances. The white crystalline compound, which, after U.V. and I.R. examination, exhibited the maximum absorption at 206 mµ and the characteristics of long chain-n-alkyl, adjacent to a carboxyl group, was identified as palmatic acid. The molecular formula was, later on, confirmed to C19H38O2. The second, which was oily in nature, exhibited the presence of capsaicin due to its maximum absorption in U.V. at 230 and 281 · 5 mµ. It also represented all the properties of capsaicin oleoresin, when compared chemically as well as physically with the commercial oleoresin of capsaicin E. Merck Darmstadt, but could not be crystallized even after chromatography over neutral and acidic alumina with various solvents or after subjecting it to high vacuum distillation (10−4 mm).
pp 202-213 May 1973
Eight polychaetan species are described here, three of which,viz., Burtinella concava (Sow.),Tubulostium callosum Stol.T. discoidium Stol., described by Stoliczka as gastropod species, are now transferred to the Polychaeta in the light of new information. Among the three species described here as new to science, one has for its proper placement, necessitated creation of the new genus,viz., Rotulispira falling under the subfamily Spirorbinae Chamberlin.Spirorbula Nielsen is repotted for the first time from South Indian Cretaceous. Family Terebellidae Grube represented byTerebellolites Desio, a heterogenous group, is also recorded for the first time from these deposits.
pp 214-224 May 1973
Fecundity estimations from sixty-five specimens ofL. rohita ranging in size from 150 g to 5,000 g have been made. The relationships between total length and fecundity, total weight and fecundity, ovary weight and fecundity, total length and ovary weight and total weight and ovary weight have been worked out for the species. Statistically significant relations were found to exist between the above variables. An attempt has been made to estimate the percentage of eggs retained in the ovary of rohu during spawning. Fecundity factors and percentage ovary weights of the species were found not influenced by the size of fish.