摘要
The large amount of microplanktonic algae in nature are not all thermally degraded directly into organic matter from their original green autotrophic state. When the algae are old or dead and deposited at the bottom of lake or ocean, some changes may take place in the cells, including the disappearance of the chlorophyll, the
基金
Project supported by the National Natural Science Foundation of China
the State Key Laboratory of Organic Geochemistry.
