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Serial monthly peptidase activities were assayed in the surface water of Lake Shinryu, located in the Chugoku district of Japan, using artificial fluorescent peptidase substrates. The results indicated that the lake water had higher aminopeptidase activities than endopeptidase activities except in November and December, whereas lake water filtrated using membranes with a pore size of 0.2 μm showed...
We investigated the constituents of Veronicastrum villosulum (Miquel) Yamazaki (Scrophulariaceae), an endangered species belonging to the IA group. From the aerial parts of this plant cultivated at the botanical garden of Sojo University, we isolated two new cucurbitacine-type glycosides, 3-O-α-l-rhamnopyranosyl-(1 → 2)-[β-d-glucopyranosyl-(1 → 3)]-β-d-glucopyranosides of 3β,25-dihydroxycucurbit-5,23(...
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