Volume 68, Issue 5
November 1968, pages 221-267
pp 221-224 November 1968
Chromosome numbers from meiotic studies have been reported for the following species ofUtricularia: U. aurea Lour. (n=21);U. baouleënsis A. Chev. (n=10);U. caerulea L. (n=20);U. inflexa var.stellaris (Linn.f.) P. Taylor (n=21);U. minutissima Vahl (n=8);U. scandens Benj. (n=6, 7); andU. stricticaulis Stapf (n=7). There are two cyto-races inU. scandens.
pp 225-231 November 1968
Initial adaptive responses in the oxygen consumption to warm and cold stress was studied at the organismal level in two species of eurythermal freshwater teleosts,Etroplus maculatus andCirrhina reba. E. maculatus, studied during the summer months, was found to acclimate completely to warm (35° C.) and partially to cold (20° C.). As against this,C. reba, studied during the winter months, was found to acclimate partially to warm. Cold acclimation could not be studied in this species. These differences are discussed in the light of the previous thermal history of these fishes and the thermal gradient imposed in each case.
pp 232-239 November 1968
Vitamin K5 sensitisesStaph. aureus under oxic as well as anoxic conditions. It decomposes at room temperature and the decomposition products also show radiosensitisation. The sensitising effect is due to the reaction of cell constituents with some short-lived transients of vitamin K5. These are formed mainly by the reaction between the sensitiser and the hydroxyl radicals produced during radiolysis of water in the surrounding medium.
pp 240-249 November 1968
The floral anatomy of two species of the genusPhrynium belonging to the tribe Phrynieae is described in detail. Varying degrees of reduction of the gynoecium leading to the functionally unilocular condition of the ovary are witnessed inPh. parviflorum, a condition characteristic of species of the tribe Maranteae. The placentation is basal. The present study brings forth further evidence in regard to the nature of the labellum and the condition of the functional stamen.
pp 250-260 November 1968
A brief account of the morphology of the plant is given. The anatomical data pertaining to the vegetative organs and the peduncle are presented. One interesting fact regarding the occurrence of different types of bundles in the rhizome is noticed. Four types of stegmata which are of taxonomic value, are observed in the lamina and elsewhere.
pp 261-267 November 1968
Four fungal strains, namelyAspergillus flavus, Aspergillus oryzae, Penicillium rubrum Stoll andPenicillium purpurogenum have been tested for their toxigenic effects in mice.Aspergillus flavus andPenicillium rubrum have been found to be hepatotoxic. Pathological variations observed have been discussed.