溶剂对三种纤维素衍生物液晶临界浓度的影响

溶剂对三种纤维素衍生物液晶临界浓度的影响董炎明蔡青松袁清（厦门大学化学系厦门３６１００５）临界浓度（Ｃ＊ｐ）是溶致液晶在一定温度下刚能形成液晶相的最低浓度．影响Ｃ＊ｐ因素可以从体系中高分子和溶剂两个方面来考虑．关于高分子，Ｆｌｏｒｙ已阐明链刚性越大则...

Seasonal Variation on Amounts and Groups of Heterotrophic Microorganisms in Forest Soil at Wuyishan National Nature Reserve

The season variation on amounts and groups of heterotrophic microbes in soil at Wuyishan National Nature Reserve was investigated. The main results are as follows:1) Amownts of heterotrophic microbes were notably varied with different seasons (p<0.01) ;2)During spring,amounts of heterotrophic microbes were higher,and have a great fluctuation (s=15.46);while in autumn, amounts of heterotrophic micrlbes were much lower and have a little fluctuation (s=4.21);3)During the same seasons in different years, amounts of heterotrophic microbes were not exactly the same but only have a little differences; 4)In soil,heterotrophic microbes of the three groups changes in accordance with total number of heterotrophic microbes ;5)Among these three groups of heterotrophic microbes, bacteria group was the first in number,filamentous fungi the second, while actinomyces the third;6)variation of the percentages of constitution among these three groups in different seasons was that:changes of actinomyces were steady, while changes of bacteria and filamentous fungi were remarkable.