Bioassay techniques for drug development atta ur rahman and miqbal choudhary hejresearch institute of chemistry university of karachi pakistan and william jthomson arena pharmaceuticals san diego usa harwood academic publishers australia o canada o france o germany o india o japan o. Bioassay techniques for drug development january 2001 screens are most important for the initial screening of plants for bioactive principles and are often the first step in drug development . Request pdf on jan 1 2005 atta ur rahman and others published bioassay techniques for drug development find read and cite all the research you need on researchgate. Bioassay techniques for drug development atta ur rahtnan and m iqbal choudhary hej research institute of chemistry university of karachi pakistan