Browsing by Author "Vasundhara Sharma"

Now showing 1 - 2 of 2

Influence of ultraviolet irradiation on nutrient‐gleaning capacity of two unicellular algae
(1975) H.D. Kumar; Vasundhara Sharma; G.P. Bisaria
Two unicellular algae, viz., Anacystis nidulans and Chlorella vulgaris, growing in polluted effluents, were isolated in unialgal and bacteria free culture. They were mutagenically exposed to ultraviolet radiation and variant strains endowed with differing capacities for growth and nutrient‐gleaning were successfully isolated as distinct clones on agar plates. One such clone each of the two species was tested further and found stable. While these variant strains grew more slowly than untreated controls, statistically significant differences with respect to phosphate and nitrate uptake were found between treated and control strains of the two species. Copyright © 1975 Wiley‐VCH
Production of pollution‐tolerant strains of unicellular algae through mutagenic treatment. I. Ethyl methane sulphonate
(1974) H.D. Kumar; Vasundhara Sharma; G.P. Bisaria
The unicellular algae Anacystis nidulans and Chlorella vulgaris were collected from effluents of the Indian Oil Refinery Barauni and the Sindri Fertilizer Factory (India), respectively, and isolated in unialgal and bacteria‐free culture. The algae were treated with the mutagen ethyl methane sulphonate and such mutagenically treated algae were compared with untreated controls with respect to growth characteristics and the capacity to absorb the two important components of polluted habitats, viz., phosphate and nitrate. Treated A. nidulans grew faster and showed a consistently higher uptake of phosphate than untreated. Treated C. vulgaris cells grew more slowly than untreated cells and showed lesser phosphate uptake during early phases of growth but greater uptake during the later phases. Nitrate uptake capacity was increased in both algae following treatment. Copyright © 1974 Wiley‐VCH