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Articles by A. Nagasathya
Total Records ( 5 ) for A. Nagasathya
  A. Nagasathya and N. Thajuddin
  The composition, distribution and biodiversity of cyanobacteria were investigated in relation to salinities of several saltpans of Southeastern coasts of India from Vedharnyam (10 °22` N; 79 °51` E) to Mandapam (9 °17` N; 79 °7` E). Sixty one species belonging to 21 genera and six families were identified. The salinity was ranged from 48 to 185 ppt. Almost all species were found along the range from 48 to 89 ppt., while there was a relative reduction in species composition and biodiversity with salinity of 150 and 185 ppt. The most widespread cyanobacteria were Spirulina subsalsa, S. labyrinthiformis, Oscillatoria willei, O. salina, O. subbrevis, O. laete-virens, Phormidium tenue and Microcoleus chthonoplastes. Aphanothece microscopica, Arthrospira platensis, Dermocarpa leibleiniae, Oscillatoria terebriformis, Oscillatoria acuminata and Synechocystis salina were limited in their distribution to lower salinities. Nostoc sp. was the only heterocystous form recorded in the hypersaline environment.
  A. Nagasathya and N. Thajuddin
  The antioxidant property of cyanobacterial isolates was analyzed by physical (bodyweight change and swimming time) and biochemical parameters (superoxidedismutase activity and total reduced glutathione activity) by using swiss mice at Animal House, J.J. College of Arts and Science, Pudukkottai, Tamil Nadu, India. The efficiency of cyanobacterial isolates was determined by comparing with the antioxidant property of SpirulinaPhormidium tenue (KMD 33) possess significant antioxidant property when compared to other cyanobacterial isolates and Spirulina (commercial grade).
  A. Nagasathya and N. Thajuddin
  The present study is the first detailed investigation of the diversity and distribution of diatoms in relation to the hydrography in the Saltpans of Southern coasts of India starting from Vedharanyam to Mandapam. Totally 52 taxa, both centric and pinnate diatoms were identified in the present investigation. When compared to Palk Strait and Palk Bay regions less diversity of diatoms was observed in the Bay of Bengal region. Highest diversity of diatoms was observed in the 50 ppt. But only 4 taxa namely Achnanthes hauckiana, Cyclotella striata, Pseudonitzschia seriata and Thallassionema eccentrica were observed at higher salinity (150 ppt).
  D. Praveen Kumar , R. Thenmozhi , P.D. Anupama , A. Nagasathya , N. Thajuddin and A. Paneerselvam
  The aim of the investigation was to obtain a potential indigenous biocontrol agent against Fusarium oxysporum f.sp. lycopersici on tomato from different agroclimatic zones in India. Wide collection of Trichoderma and Bacillus was conducted from tomato rhizospheric soil in IIVR farm (Varanasi), IIHR farm (Bangalore), IARI farm (Rajendra Nagar) and farm of APHU (T.P. Gudem) by using Trichoderma Specific Media (TSM) and Nutrient Agar (NA). As a result, total 65 strains were cultured and maintained in which 28 were Bacillus and 37 were Trichoderma, respectively. On the basis of in vitro bioassays viz., dual culture and poisoned food technique it was concluded that 3 most prominent Trichoderma isolates viz., DPNST-4, -8 and -29 and four most prominent of DPNSB-2, -11, -18 and -28 from Bacillus were selected.
  A. Nagasathya and N. Thajuddin
  Biological treatment of wastewaters is a growing field of active research mainly by using microalgae including cyanobacteria. Hypersaline cyanobacterium Phormidium tenue KMD33 isolated from the saltpans of Kattumavadi and was maintained in Mn medium with 100 ppt of salinity. P. tenue KMD33 isolate was inoculated in the 250 mL conical flask containing 200 mL of each effluent samples collected from different locations of Paper Mill industry and were maintained in culture room, Department of Microbiology, J.J. College of Arts and Science, Pudukkottai, Tamil Nadu, India under white fluorescent lamp Among the physicochemical parameters studied initially and after 20 days of incubation period with P. tenue KMD33, considerable reduction in the levels of chloride, salinity, alkalinity, calcium, magnesium, nitrite, nitrate, inorganic phosphate, COD, BOD and sulphate and the increasing levels of pH, dissolved oxygen and electrical conductivity were observed. A significant change in the color reduction (from 60-90%) was recorded after 20 days of incubation period. This preliminary result showed that the hypersaline cyanobacterium P. tenue KMD33 is an efficient candidate for the removal of colour from the effluent.
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