Some Methods Used in Tracing Radioactive Growth-Regulating Substances in Plants

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Abstract
An inexpensive applicator made to hold radioactive solns. and mixtures in a pipette at a distance from the operator is described. With this apparatus as little as 0.01 ml. of soln. can be delivered readily and placed on a plant. A simple method of plating samples of ground, radioactive plant tissues on the tacky surface of cellophane is described. The method makes possible the measurement of radioactivity in a weighed sample of ground tissue spread in an even layer essentially one particle in thickness. Evaluation of counts in terms of wt. of the tagged compounds was accomplished by impregnating a plated sample of tissue with a known amt. of the tagged compound.

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