原子荧光法研究硒的微生物转化效率

本文用氢化物发生──原子荧光法研究了水体中硒的微生物转化效率、单质硒是主要的产物。经微生物作用后，亚硒酸根和硒酸根的转化率分别为95％和91．7％，因此认为该法能用于水体中硒的去除。

秸秆纤维素生物转化预处理方法研究进展

秸秆预处理效果直接影响其进一步的合理有效利用。分析了影响秸秆生物转化效率的主要因素,综述了秸秆处理的不同方法与特点,展望了秸秆预处理技术研究的发展趋势。

湖南省农业转化效率的地域差异研究

该文以湖南 10 1个县 (市、区 )为评价单元 ,从粮食单产、化肥生产力、劳动生产率、农业总产值增长率、农民人均收入、人均收入增长率、投入产出率、粮食增长率、粮食保证率等方面 ,研究了湖南农业转化效率的现状及区域差异 ,并进行了农业转化效率的优度排序、分类和分区。湖南农业转化效率水平不高 ,发展不平衡。长衡丘陵盆地区、洞庭湖平原区转化效率优于湘西、湘南山地区。从行政区划上看 ,农业转化效率较优的是湘潭市、株洲市、长沙市等 ,而湘西自治州、张家界市。

养兔是农村致富途径之一

养兔是农村致富途径之一腾冲县小西乡畜牧兽医站６７９１００邓德凡１、低耗。家兔生物转化效率高，耐粗饲。能有效利用植物粗纤维和粗蛋白，无精料时可用饲草维持生产。家兔每增重１千克所需消化能仅为１１９８兆焦，而羊为１９６１，肉牛为２２４９；１公顷土地的...

Intrinsic advantages of Cheilomenes sexmaculata over two coexisting Coccinella species （Coleoptera：Coccinellidae）

Development, survival and reproductive performance of coexisting ladybird species, viz. Cheilomenes sexmaculata, Coccinella septempunctata, and Coccinella transversalis, of the tribe Coccinellini were studied and compared to assess their coexistence and ecological relationships. High values of life history parameters, viz. developmental rate,immature survival, fecundity, egg viability, reproductive rate and conversion of efficiency of ingested food were recorded for C. sexmaculata followed by C. transversalis and C.septempunctata suggesting that the former has intrinsic advantages over the latter two species. This could possibly counterbalance its disadvantages, like relatively smaller size and weight, thereby making it competitive. The developmental period increased with increase in body size. Exceptionally high fecundity after single mating has been recorded in C. sexmaculata. The egg viability, however, was lower than in both Coccinella species.