Acidity and gas interchange in cacti by Herbert M. Richards PDF

By Herbert M. Richards

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Extra info for Acidity and gas interchange in cacti

Example text

It will be seen that in general the differences between maximum and miniWhen are greatest in the summer time, as, indeed, would be expected. the plants are supplied with water they are most active during that season, and as the sunlight is stronger and the temperature higher, any effect of these In the three series of March factors on the acidity would be more marked. 31, respectively. These may be compared with the results shown in table 13 for mature-turgid in the joints, where the maximum acidity is to the minimum as 3 to 1 (actually average of the three series, 29 to 10).

In the Tucson experiments (table 18) exposure to 75 to 80 per cent oxygen was followed by a more than 50 per cent decline in acidity, showing very plainly that under fairly constant conditions of temperature and in the dark the oxidation of the acids will proceed more rapidly when an excess of oxygen is supplied. In ordinary air, under the same conditions, the diminution of was considerably less, though still well marked, but in pure hydrogen was maintained at almost its original point. As in these specimens the initial acidity was high probably near its maximum it would hardly be expected that actual rise of acid-content would be shown in the hydrogen atmosphere, even if such a phenomenon commonly takes place.

In ordinary air, under the same conditions, the diminution of was considerably less, though still well marked, but in pure hydrogen was maintained at almost its original point. As in these specimens the initial acidity was high probably near its maximum it would hardly be expected that actual rise of acid-content would be shown in the hydrogen atmosphere, even if such a phenomenon commonly takes place. It may be noted, however, that one experiment does show such a slight increase. 32 per cubic centimeter, exposure for from 22 to 30 hours in air at about 30 C.

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Acidity and gas interchange in cacti by Herbert M. Richards


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