NATURAL materials, which possess annual lamination and record annually climatic or environmental changes, can be termed 'natural clocks'. They include tree rings, coral layers, varves, ice layers, and laminate...NATURAL materials, which possess annual lamination and record annually climatic or environmental changes, can be termed 'natural clocks'. They include tree rings, coral layers, varves, ice layers, and laminated speleothems which were reported only in the last few years. The growth layer rhythm in stalagmites is related to high-frequency and short-term climatic oscillations. The luminescent density of annual layers of stalagmites is the signal of environmental changes. The organic matter contained in drip展开更多
Recent progress in the studies of anticancer drugs originating from plants in China is reviewed in this paper. Guided by the experience of traditional Chinese medicine (TCM), several new anticancer drugs have been fou...Recent progress in the studies of anticancer drugs originating from plants in China is reviewed in this paper. Guided by the experience of traditional Chinese medicine (TCM), several new anticancer drugs have been found. Indirubin from indigofera tinctoria (青黛) is useful for the treatment of chronic myelocytic leukemia. On the basis of structure-activity relationship studies of these compounds, a second generation drug (N-methyl isoindigotin) has been developed. Clinical studies demonstrated that it is more effective than indirubin, 1O-hydroxy campothecin derived from Camptotheca acuminata (喜树) have exhibited definite activity on rodent tumors and it is used for phase Ⅱ studies. Iris latea pallasi Fischer var. Chinensis (马蔺子) may serve as展开更多
From 2010 to 2012, geologists at the Institute of Karst Geology the Chinese Academy of Geological Sciences carried out the ＂Chinese Geological Carbon Sink Projects Research＂. They did investigation and research work...From 2010 to 2012, geologists at the Institute of Karst Geology the Chinese Academy of Geological Sciences carried out the ＂Chinese Geological Carbon Sink Projects Research＂. They did investigation and research work according to three aspects of carbon sink： karst, soil, and mineral, and achieved important results.展开更多
文摘NATURAL materials, which possess annual lamination and record annually climatic or environmental changes, can be termed 'natural clocks'. They include tree rings, coral layers, varves, ice layers, and laminated speleothems which were reported only in the last few years. The growth layer rhythm in stalagmites is related to high-frequency and short-term climatic oscillations. The luminescent density of annual layers of stalagmites is the signal of environmental changes. The organic matter contained in drip
文摘Recent progress in the studies of anticancer drugs originating from plants in China is reviewed in this paper. Guided by the experience of traditional Chinese medicine (TCM), several new anticancer drugs have been found. Indirubin from indigofera tinctoria (青黛) is useful for the treatment of chronic myelocytic leukemia. On the basis of structure-activity relationship studies of these compounds, a second generation drug (N-methyl isoindigotin) has been developed. Clinical studies demonstrated that it is more effective than indirubin, 1O-hydroxy campothecin derived from Camptotheca acuminata (喜树) have exhibited definite activity on rodent tumors and it is used for phase Ⅱ studies. Iris latea pallasi Fischer var. Chinensis (马蔺子) may serve as
文摘From 2010 to 2012, geologists at the Institute of Karst Geology the Chinese Academy of Geological Sciences carried out the ＂Chinese Geological Carbon Sink Projects Research＂. They did investigation and research work according to three aspects of carbon sink： karst, soil, and mineral, and achieved important results.
