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Articles by R. Karthikayen
Total Records ( 2 ) for R. Karthikayen
  R. Periyanayagi , V. Sasikala , R. Venkatesan , R. Karthikayen and T. Balasubramanian
  Impact of industrial pollution on water quality and phytoplankton population was done for a period of one year in Uppanar estuary at three location (Ia, Ib and Ic) and open sea. Water quality and phytoplankton diversity and distribution patterns indicated that, the water quality of this environment was highly polluted. Higher levels of nutrients, heavy metals, primary productivity, chlorophyll a and total carotenoid content in station Ia indicated a possibility for eutrophication, which also confirmed by the dominance of phytoplankton Asterionella japonica and Thalassiothrix frauenfeldii. In addition to that the species diversity was also very low when compared to open sea.
  R. Venkatesan , R. Karthikayen , R. Periyanayagi , V. Sasikala and T. Balasubramanian
  Cultured marine diatom, Rhizosolenia alata (Brightwell) were freeze dried and extracted with solvents such as acetone, chloroform, chloroform: methanol (1:1), methanol: distilled water (4:1) and distilled water. The extracts were screened against 7 human pathogenic bacteria for their antibacterial activity. All the organic solvents showed activity against all the pathogens tested with a maximum activity in chloroform against Proteus vulgaris and minimum in chloroform: methanol against Staphylococcus aureus. However, there was no activity in distilled water extracts against all the pathogens tested.
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