HOME Journals Catalogue Journal Cover Page Issue Contents Pharmaceutical Biology 1999, Vol. The present study attempts a detailed summary of pharmacognostical characters to give a clear standard for identification of the drug. Wrightia tinctoria , Apocynaceae, macroscopy, histology, ash values, extractive values, microchemical, phytochemical. HOME Journals Catalogue Journal Cover Page Issue Contents Pharmaceutical Biology 1999, Vol. After 12 to 21 days of incubation the tumors appeared and were counted, and the maximum inhibition was then calculated.
More experiments are necessary to determine the exact mechanism of action.
HOME Journals Catalogue Journal Cover Page Issue Contents Pharmaceutical Biology 1999, Vol. Canada Sixteen extracts of British Columbian seaweeds, previously shown to have antiviral activity, were investigated in more detail. The A. japonicus extract showed replication-inhibition as well as virucidal activity. All extracts, with the exception of A. japonicus again, required light for maximum activity, indicating the presence of antiviral photosensitizers. These results taken together indicate the presence of different antiviral compounds with distinct modes of action, and argue strongly against the hypothesis that antiviral activities in seaweeds are due to common ingredients such as polysaccharides.