Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Bioassay, or biological standardisation is a type of scientific experiment. Bioassays are typically conducted to measure the effects of some substance on a living organism and are essential in the development of new drugs, and in monitoring environmental pollutants. Both are procedures by which the potency or the nature of a substance is estimated by studying its effects on living matter. Bioassays are procedures that can determine the concentration of purity or biological activity of a substance such as vitamin, hormone, and plant growth factor. While measuring the effect on an organism, tissue cells, enzymes or the receptor is preparing to be compared to a standard precipitation. Bioassays may be qualitative or quantitative. Qualitative bioassays are used for assessing the physical effects of a substance that may not be quantified, such as abnormal development or deformity. An example of a qualitative bioassay includes Arnold Adolph Berthold's famous experiment on castrated chickens.

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