NISCAIR Online Periodicals Repository Collection: IJMS Vol.40(1) [February 2011]

Zooplankton dynamics in the coastal waters of adubidri, Karnataka

Title: Zooplankton dynamics in the coastal waters of adubidri, Karnataka

Authors: Resmi, S; Reddy, R V; Venkatesha Moorthy, K S; Chethan, N

Abstract: Water samples were collected from five locations selected along 5, 10 and 15 m depth contour, from February 2008 to January 2009 in the coastal waters of Padubidri near the proposed dupi Power Corporation Ltd, (UPCL). Total rainfall during the period of study was approximately 2600 mm, of that more than 82% occurred during the southwest monsoon season. Air temperature varied from 287°C to 32.6°C. Water temperature, pH, salinity, dissolved oxygen and B were in the ranges of 28°C-31.4°C; 7.8-8,4; 3 L28 ppt - 35A 1%o; 4,0 mg/1-6.5 mg/1; 0040 mg/1-4A8 mg/II respectively. 24 groups of zooplankton were recorded of which, copepods formed the dominant groups. The distribution of zooplankton showed higher abundance at 5 m depth, followed by 10 m and 15 m.

Page(s): 134-141

Enhanced production of alpha amylase using vegetables wastes by Aspergilllus niger strain SK01 marine isola

Title: Enhanced production of alpha amylase using vegetables wastes by Aspergilllus niger strain SK01 marine isola

Authors: Namasivayam, S.Karthick Raja; Nirmala, D.

Abstract: 155 Fungal isolates, isolated from marine water, belong to five fungal species viz Aspergillus niger, A. fumigatus, Penicillium expansum, Trichoderma virens and Penicillium spp were screened for alpha amylase production. All the isolates belong to A.niger, 12 isolates of Trichoderma virens and A.fumigatus, 10 isolates of Penicillium expansum and 2 isolates of Penicillium spp , were produced alpha amylase. A.niger strain SK01 was selected for alpha amylase production. Vegetables wastes were used as a substrate by solid state fermentation under 0,10,20,40 and 50% moisture content. Enzyme activity was studied at 30°C, 40°C, 50°C, 60°C, 70°C temperature and the pH 5,6,7,8 and 9. Wastes supported growth and enzyme activity at all parameters tested. Maximum activity was recorded at 0% moisture content, 70°C temperature and pH 9.

Page(s): 130-133

Evaluation of nymphicidal and ovicidal effect of a seaweed, Padina pavonica (Linn.) (Phaeophyceae) on cotton pest, Dysdercus cingulatus (Fab.)

Title: Evaluation of nymphicidal and ovicidal effect of a seaweed, Padina pavonica (Linn.) (Phaeophyceae) on cotton pest, Dysdercus cingulatus (Fab.)

Authors: Sahayaraj, K.; Kalidas, S.

Abstract: Impact of brown seaweed, Padina pavonica (Linn.) chloroform, and benzene extracts were evaluated against an economically important cotton pest, Dysdercus cingulatus (Fab.) (Pyrrhocoridae). The result reveled that between the two solvents, benzene extracts of P. pavonica caused more nymphal mortality. It reduce D. cingulatus egg hatchability than chloroform extract. Benzene extract also reduced the survival rate of D. cingulatus eggs from 53.33 to 0.00 per cent for 0.025 to 0.4% concentration of P. pavonica benzene extract respectively. P. pavonica extracts also significantly reduced the total body protein (22 to 39%) and DNA (27 to 30%) content. Presence of saponin, steroids and phenolic compounds in the extract might be the reason for these activities. It is concluded that P. pavonica possess both nymphicidal and ovicidal activity. It can be utilized for the management of sucking pests of cotton and other crops.

Page(s): 125-129

Biosorption of uranium and thorium by Marine micro algae

Title: Biosorption of uranium and thorium by Marine micro algae

Authors: Manikandan, N.; Prasath, C. S. Siva; Prakash, S.

Abstract: Different concentration of uranium and thorium uptake by algal biomass was studied. Chlorella salina and Isochrysis galbana was used to uptake the uranium and thorium in the present study. Different concentration of live cells of algae was also used to uptake the uranium and thorium. Increasing concentration of uranium and thorium showed decrease in absorption by Chlorella salina and Isochrysis galbana. Increase in biomass concentration has the ability to uptake more amounts of uranium and thorium. Chlorella salina absorbed more amount of metal than the Isochrysis galbana. Amount of uranium was uptake more than the thorium by Chlorella salina and Isochrysis galbana. Chlorella salina absorbed more amount of thorium.

Page(s): 121-124