Effects of the Physical Environment on the Physico-Chemical Properties of Plant Saps, and the Relation of These Properties to Leaf Temperature

Biochemical Methods for the Study of Nitrogen Metabolism in Plants

“…been made. on plant saps; the work of GREATHOUSE (5), MEYER (12), PETTINGER (13), and SAYRE and MORRIS (14,15) are examples of several applications of this method. The heating of the plant juice to 70°C., however, easily coagulates the colloidal material and inactivates the enzymes without the further loss of soluble nitrogen.…”

Comparison of the Calcium and Sulphur Content of Plant Fluids Expressed From Tissues Killed by Autoclaving and by Freezing With Solid Carbon Dioxide

“…Total sulphur content of saps expressed from autoclaved tomato leaves and stalks was lower than that expressed from similar samples killed by freezing. 4. Precipitation of calcium rather than a base exchange reaction during the autoclaving is indicated.…”