Studies on Catalase of Green Leaves. II

Studies on the Effect of Temperature on the Catalase Reaction. Ii. Loss of Catalase Activity

In the preceding paper (1) the possibility of spontaneous inactivation of the enzyme by heat has been mentioned as a factor responsible for the diminished catalase activity, especially at temperatures above 20°C. To determine to what extent this may have played a r61e in the experiments at different temperatures, the activity of catalase subjected for various lengths of time to the influence of...

Gaseous Losses of Nitrogen from Green Plants. Ii. Studies with Excised Leaves in Nutrient Media.

In the previous paper (1) of this series, studies to determine whether gaseous losses of nitrogen occur from cultures of Chlorella and Lemna when grown on various sources of nitrogen, showed that no losses occurred except for one minor exception. In this one case slight losses of nitrogen from Chlorella cultures, grown on ammonium nitrate, did occur. The significance of this finding is somewhat...

The Proteins of Green Leaves

Previous work (1) has shown that about 50 per cent of the total protein nitrogen contained in a tobacco leaf which had recently completed growth by expansion is associated with particulate structures of leaf protoplasm such as nuclei, chloroplasts, etc. The other 50 per cent of the protein nitrogen remains soluble in the presence of neutral buffers. In the analytical ultracentrifuge, the solubl...

Studies on the Inactivation of Catalase Iii. Destruction of Catalase by Hydrogen Peroxide by Sergius Morgulis

Catalase Activity and Respiration in the Leaves of Growing Barley^

There has been some diiïereiice of opinion as to whether there is an association between catalase activity and respiration. In 1910 Appleman (1) ^ noted a correlation between the two in the potato tuber and later (2) observed the same thing in potato tubers manipulated in various ways to modify respiration and in stem and seed ends of the same tuber. He found a similar correlation in stored swe...