检索结果-南通市图书馆

The taxonomic status of Moschus moschiferus anhuiensis

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 1999年第8期44卷 719-723页

作者： H.Tamate R.Masuda J.Nagata N.Ohtaishi Ishinomaki Shenshyu University Ishinomaki 986 JapanHokkaido University Sapporo 060 JapanHokkaido University Sapporo 060 JapanHokkaido University Sapporo 060 Japan

Since the musk deer distributed in the Dabie Mountains, Anhui was defined as Moschus moschiferus anhuiensis, its status has been disputed based on researches of morphology and ecology. This study further probed into its taxonomic status with principal components analysis (PCA) on skull measurements and mtDNA cytochrome b sequences (367 bp) analysis so as to clear its status. It is concluded that the figure and skull in Anhui musk deer are different from other species, and DNA divergence between it and other species is 6.24%-7.90%, which belongs to inter-specific difference. Thus, the study defines this musk deer as one distinct species, Moschus anhuiensis (Wang, Hu et al.)

关键词： Anhui musk deer morphology cytochrome b taxonomy.

Discussion on measurement and calculation principle of petrogenetic depth

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 1999年第24期44卷 2293-2295页

作者： LU Guxian and LIU Ruixun Institute of Geomechanics , Chinese Academy of Geological sciences , Beijing 100081 , china Department of Geology, Peking University, Beijing 100871, china Institute of Geomechanics Chinese Academy of Geological Sciences Beiing China Department of Geology Peking University Beijing China

Geologic and geophysical data certificate that lithosphere and its down rock behave as solid, therefore,it is better to measure petrogenetic and metallogenetic depth according to internal stress of solid states. Lithomechanic experiment found that the bigger the confining pressure, the bigger the tensile and shear strength of rocks,so rock can bear very high differential stress but it is not broken. Sibson put forward that the property of rocks under 10-15km of the surface changes from brittle to ductile (rather than from elastic to plastic). Rock with ductile de-

关键词： petrogenetic depth solid stress state tectono-original additional hydrostatic pressure rock strength.

Experimental observation of deep crust fluid-NaCl aqueous solution at elevated temperatures and pressures and its significance

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 1999年第7期44卷 654-660页

作者： Ronghua Zhang Shumin Hu Chinese Acad Geol Sci Open Res Lab Geochem Kinet Beijing 100037 Peoples R China

In order to reveal the nature of deep crust fluids, the phase relations of NaCI-saturated solution at high temperatures and pressures in a hydrothermal diamond anvil cell (HDAC)are investigated. Salinity of the solutions observed is about 35%—50%. The temperatures for the observation range from 25 to 850℃ and the pressures from 1 atm to about 1 GPa. A supercritical single phase, liquid phase (L), vapor phase (V), solid phase (H), L + H, H + V + L and the near-critical phases L + V can be observed. A two-phase (L + V) immiscibility field for the NaCI solution has been discovered to lie in a wide range of temperatures and pressures:from 250( ± 3) to 721℃. Within this field there are two parts, where the upper high temperature part of the two-phase regions is very unstable in character. It is possible to observe a 'critical phenomenon'. In some of our experiments an 'explosion' almost constantly occurred at the interface between the liquid and vapor phases, making the interface obscure, and a

关键词： two-phase immiscibility critical phenomenon solution structure.

Oxalate-induced resistance of muskmelon to WMV-2

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 1999年第19期44卷 1794-1797页

作者： Guangyu Zheng Rongle Zhao Xu Peng Beijing Normal Univ Dept Biol Beijing 100875 Peoples R China

The treatment of muskmelon cultivar 'Wangwenxiang', which is sensitive to watermelon mosaic virus-2 (WMV-2), with oxalate increases systemic resistance of the cultivar to WMV-2 significantly. The challenge inoculation experiments indicate that the symptom of ox-alate-treated plant is much slighter than that of control plants and the virus content is only 4%

关键词： oxalate muskmelon watermelon mosaic virus-2 inductive resistance.