Main Pests groups and Prevention from gardens woods in western cities, Heilongjiang Province.;

Objective To analyze the seasonal changes in groups,quantity,and distribution of sulfate-reducing bacteria(SRB)in Lake Erhai,so as to provide biologic information for the study of environmental pollutant transfer in that region.

Maize inbred line Ji853 from Huangzaosi groups was improved by Dan340, and selected excellent line cultivars Jin01 and Jin02 that with high combining ability and head smut-resistance.

With the theory of object-oriented design,jump table,dynamic memory management and code pre-processing,the class group of software simulators for single-chip microcomputers are designed.

In this paper,the necessary and sufficient conditions for 4-rank and 8-rank of narrow class groups of F equal to 1 are given.

In a decomposition of the 2-Sylow subgroup of the class group of a quadratic number field into cyclic subgroup summands, counting the number of summands of order at most 8, namely the 8-rank of class group, becomes significant.

Analysis on Groups of Streptomyces in the Soil in Hefei Area;

From the UPGMA cluster analysis,the 42 taxa could be classified into four groups.

899 all of the communiti-es was clustered into three groups,then it is equal tO 0.

Based on some characteristics,particularlly bracts,the clones were divided into three populations,i.