( 2 ) through consuming co2 and secreting alkaline matters from their cellls to soil , micro - algae can improve soil ph value , and transform the weak acid soil into weak base soil . ( 3 ) through photosysthesis transforming co2 into organic matters , micro - algae can increase the content of soil organic matter 肥沃土壤中的微藻接种进入贫瘠土壤后，在黑暗条件下逐渐死亡，有光条件下的微藻经过一段时间的适应后，到第90天时，每克土中的微藻数量增长到接种量的7 - 8倍。
The results showed that with the increase of initial concentration of abamectin , the microbial decomposition rate increased , but higher concentration of abamectin inhibited the decomposition rate ; when the inoculation amount of dominant bacteria increased , the decomposition rate was accelerated ; two possible metabolite products were found by the analysis of tic and ms chromatogram , and possible mechanism of microbial degradation of abamectin was put forward 结果表明：在一定范围内，当底物浓度增加时，降解速率常数相应加快，但高浓度对降解速率有一定抑制作用；而随着接种量增加，降解速率逐渐加快；通过分析tic图和质谱图，可能主要有两种代谢产物，进而推测了其降解机理。
The optimized result of cell immobilization cultures was acquired , including the support matrices pretreatment , the class and size of support matrices , the level of dissolved 62 and inoculum . the optimal ratio of hormones was got by uniform design according to its high immobilization level , high metabolism and retaining vigorous cells with long period . a medium which fit well all the conditions was obtained , and the efficiency of producing ginkgolides by cell culture improved obviously 进行了优良种系的诱导和优选，得到了一种生长快、分散性好，并很好的符合固定化要求的细胞株系；对固定化条件进行了最优化配置- -从载体预处理、载体种类、载体量、大小和溶氧到细胞接种量系统的研究；采用均匀设计寻求一种高固定化、高代谢及长期保持细胞活力的激素配比，最终得到一种基本满足上述要求的培养基。
A . niger m - l which was screened in our laboratory produced a strongly a - transglucosidase . in this paper , studies on the fermentation conditions , purification and characterization of a - transglucosidase and its necessary groups was carried out in this dissertation . the main reports were as following : the fermentation conditions in shaking flasks were investigated by the method of single - factor analysis , the suitable main medium was achieved : which contained 4 % a , 2 % b and 1 % g ; the a . niger m - l was inoculated into 100ml medium in flask , shaking in 33 c at 140r / min for four days , with initial ph6 . 5 and 6 % inocula volume ; adding 0 . 1 mmol / l methyl a - d - glucopyranoside had inductive effect on enzyme formation , the a - transglucosidase activity amounted to 296 . 05u / ml 本研究以黑曲霉m - 1为出发菌株，对其-葡萄糖转苷酶的产酶影响因素、纯化、酶学性质以及必需基团进行系统的研究，结果如下：通过对影响黑曲霉m - 1产-葡萄糖转苷酶的单因素分析，得液态发酵生产-葡萄糖转苷酶的最适产酶条件为： 4 a ， 2 b和1 g ；在33 ，起始ph值为6 . 5 ，转速为140r min ，接种量为6 ，装液量100ml条件下，发酵4 . 0d ，酶活力达296 . 05u ml ，添加0 . 1mmol l的酶作用底物甲基- - d -葡萄糖苷对产酶的诱导作用最大。
The highest avermectin yielding were obtained when the fermentation conditions were as follows : temperature 28 @ , inoculation 12 % , rotation 210 r . p . m , seed age of 30h . it was found that the ammonia ion could distinctly inhibit biosynthesis of avermectin and the mechanism of this phenomenon was investigated . k2hpo4 and mgso4 did not inhibit or increase the avermectin yielding 发酵时间9 - 10天开始迅速合成阿维菌素；温度28最好；接种量12使阿维菌素的产量较高；转速210转分较为适合产生阿维菌素的通气量；选用30小时左右的种mx龄可使阿维菌素的产量提高。
