Through on-site pilot experiments,full-scale treatment ponds,the microscopical observation of biofilm,distribution,succession and functions of metazoans in raw water biological treatment system were studied;and the functions and influence of bryozoan and Galba pervia to biological pretreatment and subsequent conventional water purification were also discussed.

Predation of micro-protozoa on bacteria in Taihu Lake;

The topologic architecture of metazoan trace fossils may be subdivided into 3 clusters, 8 basic topologic configurations, 3 combined topologic configurations and 21 topoichnologic kinds, which are considered to be related to ethologic classifications of trace fossils in origin.

Analysis of their morphologies and features leads to the conclusi on that these structures might have been in connection with metazoan activity, bu t the possibility of their abiotic origin can not be ruled out.

The late Neoproterozoic is an important period of biological evolution; and the emergence of metazoa is a representative event, which marked the history of biology evolution having entered a new era.

Studies to estimate the origin time of the Metazoa using molecular data have been steadily increasing in recent years.

A study of microbiota in irrigated area aroud Zhangye paper mill;

This paper at tempts to analyze and demonstrate the polluted water quality of pulp and paper wastewater from the indication of the microbiota by observing and monitoring the microbiota in the irrigated areas around Zhangye Paper Mill.