根田鼠肾上腺皮质酮水平的日节律及急性低氧的影响

根田鼠肾上腺皮质酮水平的日节律及急性低氧的影响ＴＨＥＣＩＲＣＡＤＩＡＮＲＨＹＴＨＭＯＦＣＯＲＴＩＣＯＳＴＥＲＯＮＥＬＥＶＥＬＡＮＤＥＦＦＥＣＴＯＦＨＹＰＯＸＩＡＯＮＲＯＯＴＶＯＬＥ（ＭＩＣＲＯＴＵＳＯＥＣＯＮＯＭＵＳ）根田鼠（Ｍｉｃｒｏｔｕｓｏｅｃ...     

短尾猴和猕猴在中国安徽省南部的分布

短尾猴(Macaca thibetana)和猕猴(Macaca mulatta)在安徽省的分布见于长江以南,短尾猴限于海拔600-1500米的山地,而猕猴则从平地一直分布到没有短尾猴占据的较高山地。短尾猴所选择的栖息地海拔高度较高,并决定于是否有悬崖和常绿阔叶林。两种猴的分布区,都因人类的严重干扰而缩小。但是,如果其栖息地得到很好的保护,它的种群密度可以接近黄山的水平。两种猴之间的分布界限也反映了它们生态关系的一般形式。     

短尾猴栖息地的季节变化

本文阐述了短尾猴栖息地的季节变化。春季,主要利用海拔570-1600米的常绿阔叶林、常绿、落叶阔叶混交林和落叶阔叶林;夏季,限于海拔1000米以上的落叶阔叶林。秋季的栖息地,在海拔650-1200米常绿阔叶林和常绿、落叶阔叶混交林;冬季仅利用海拔600-900米的常绿阔叶林。此外还报道了短尾猴四季的食物组成。并对栖息地的变化原因,做了初步探讨。     

Karyotype Evidence for Distinguishing Between Hemerocallis esculenta and H. middendorfii

Hemerocallis dumortierii, H. esculenta and H. middendorfii were considered to belong to a biological complex, and were treated as different varieties of the same species, H. dumortierii. The present authors observed and compared the karyotypes of H. esculenta and H. middendorfii. Two plant samples for each of the species were studied. One sample of H. esculenta was from Wuán County, Hebei Province, at an altitute of 1000 m, the other from Shennongjia, Hubei Province, altitute 2100 m. The two samples of H. middendorfii were respectively from Antu County, at an altitute of 700 m, and Tonghua, altitute 500 m, in Jilin Province. The karyotypes are 2n＝2x=22=12m+8sm+2T for H. esculenta, while 2n＝2x＝22=10m+6sm+4st+2T for H. middendorfii. The karyotypical difference between the two taxa was obviously not intraspecific but interspecific. Based on the karyotype data as well as the morphological and phytogeographical data available, it is considered that H. esculenta and H. middendorfii should be recognized as different species, instead of different varieties of the same species as in literature, and that H. mid-dendorfii is more advanced than H. esculenta.     

Numerical Cytotaxonomic Studies of Hemerocallis (Liliaceae) from China

Comparative studies of karyotypes in Hemerocallis from China have been carried out using numerical techniques. Taxa studied are as follows: Hemerocallis citrina, H. dumortieri , H. esculenta , H. forrestii , di- and triploid H. fulva , H. lilioasphodelus , H. middendorffii, H. minor, H. multiflora and H. plicata. The results show that variation in speciation has taken place at chromosomal level, and that karyotype variations have largely paralleled the morphological ones. Taxonomic proposals are given to treat H. citrina and H. minor as subspecies of H. lilioasphodelus, and H. esculenta as a variety of H. dumortieri. The results are not in favour of considering H. middendorffii as a variety ofH. dumortieri, and H. multiflora closely related to H. plicata.     

眼组织细胞内的激光等离子体诱导蚀除

文章对眼组织细胞内的激光等离子体诱导蚀除的发展现状、物理机理及未来趋势做了综合评述,并从理论上解释了眼组织内等离子体的屏蔽机制,同时提出了更有效蚀除即把副作用降低到最低限度的解决办法。