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DIE ERNÄHRUNGSPHYSIOLOCilE DER CHEOROPHYCEEN
271
oxidation products, the latter exercising an inhibiting influence ön
growth.
22. Ascorbic acid is not in itself poisonous. The poisonous effect
that can be observed in a rather eoncentrated solution is duc to
secon-dary changes connected with the oxidation (pH decrease, toxic oxidation
products).
23. Under the influence of ascorbic acid the Chlorophyll and
Carotinoid contents of the algae increase. The intensity of carbon
assimilation being directly proportional to the Chlorophyll content, carbon
assimilation and simultaneously dry matter and cell division increase. Ön
the other hand, ascorbic acid is not absolutely necessary for the
formation of Chlorophyll.
24. In heterotrophic nutrition the positive influence of ascorbic
acid ön cell division fails to appear. Algae raised under heterotrophic
conditions (glucose) are free from ascorbic acid and are thus incapable
of Converting glucose into ascorbic acid. Algae raised under autotrophic
conditions contain ascorbic acid in suboptimal quantities. The formation
and activity of ascorbic acid are consequentlv bound up with light.
25. The intensity of respiration of the algae increases somewhat
alter treatment with ascorbic acid.
2f>. The results attained with Chlorophyceae as to the effect of
ascorbic acid probably possess general applicability. The ascorbic acid
in the green plants is not to be regarded as a passive photosynthetic
product the quantity of which is dependent ön Chlorophyll content,
intensity of carbon assimilation and glucose content. Ön the contrary,
ascorbic acid affects the intensity of carbon assimilation and production
of the drv matter of the plants by increasing the Chlorophyll content.
27. The algae did not react to a thiamin admixture at all or did so
only to an insignificant degree. Presumably tliey synthesize themselves
their thiamin in quantities quite sufficient for their needs.
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