Volume 80, Issue 2
August 1974, pages 51-104
pp 51-67 August 1974
Mathematical relationships of different morphometric characters ofGudusia chapra are dealt with in this paper. The relationships determined by least squares method, by fitting straight liney=a +bx, are found to be linear. The ratio and the percentage of measurements of the various body parts are computed and described systematically in a comparative form. A new finding regarding the origin and position of the dorsal and pelvic fins at different stages of life of the species is recorded.
pp 68-75 August 1974
The anti-bacterial activity of N-substituted 3 and 4-nitrophthalimides is described. As many as sixteen compounds were tested against eleven different micro-organisms. Promising results were obtained.
pp 76-81 August 1974
Extracellular polysaccharides synthesized by sixRhizobium species (Rhizobium trifolii; Rhizobium meliloti, Rhizobium phaseoli; Rhizobium leguminosarum; Rhizobium japonicum andRhizobium species for cowpea) increased with age of the culture. Identical sugars were found in these polysaccharides on acid hydrolysis. But, however, uronic acid, amino sugars and carbohydrate contents varied in different species.
pp 82-91 August 1974
The Karyotype of seven species are described. Three of them are tetraploid (2n=32) and four triploid (2n=24). The chromosome numbers ofT. banhyhalense, T. tenebristylum, T. harbhajan-singhii ssp.pahalgamense, T. flavum andT. vulpinum f.pallidocarpum are recorded for the first time. Chromosomes are mostly medium to short in size. On the basis of chromosome morphology, in all sixteen chromosome types are recognised. None of these species shows multiple identical chromosome sets. The role of chromosome size and the number of chromosome pairs in multiple sets in evolution has been discussed.
pp 92-96 August 1974
Natural variation in the alkaloid content exists in different geographical races ofRauvolfia serpentina Benth. Their induced tetraploids obtained after seed and seedling treatments were stockier and with higher total alkaloid content in comparison to the corresponding diploids.
pp 97-104 August 1974
Chrysanthemum stunt virus (CSV) increased the total RNA of the leaves. The total of AMP, ADP, ATP, and UMP, UDP and UTP was higher than the CMP, CDP, CTPplus GMP, GDP and GTP. The maximum changes were found in AMP, UMP, UDP and UTP. The studies suggested that analogue of adenine and uracil might prove useful.