estimation of antioxidant, antimicrobial activity and brine shrimp toxicity of plants collected from oymyakon region of the republic of sakha (yakutia), russia.several plants are reported to be produced various biological active compounds. lichens from the extreme environments such as high altitude, high uv, drought and cold are believed to be synthesized unique types of secondary metabolites than the other one. several human pathogenic bacteria and fungi have been muted into drug resistant strains. various synthetic antioxidant compounds have posed carcinogenic effects. this phenomenon needs further research for new effective drugs of natural origin. ...201425026989
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