Standardization of sorption measurements and reference materials for dispersed and porous solids

Progress in the standardisation of particle and surface characterisation

In 1999, we published a comprehensive survey of standards and certified reference materials for dispersed and porous solids. The present paper summarises and reports on new standards and proposals.

Annual cycle of starch content in rhizomes of the forest geophytes Anemone nemorosa and Aegopodium podagraria

Summary Starch contents of rhizomes of Anemone nemorosa L. and Aegopodium podagraria L. were measured enzymatically. The results were compared to the developmental stage determined weekly. Minimum starch contents were measured few weeks after the begin of the growth period, then the starch contents increased during leaf expansion to reach its maximum immediately before the yellowing of the leaves. During the yellowing starch contents did not increase further due to rhizome growth. Anemone nemorosa had a higher starch content than Aegopodium podagraria. This can be explained in context of the different growth strategies of the plants. The first species follows the dominance strategy of growt…