Advances in studies on biosynthetic pathway and biotechnology of camptothecin;

Progress in biosynthetic pathway and its biological functions of plant carotenoid;

This paper introduces the current status and development tendency of the research and production of erythritol,and discusses the biosynthetic pathway of erythritol produced by an osmophilic yeast.

In this article, we make research on the process of automatic control system of papermaking, analyze the main interference,coupling paths and harmfulness that produce great effect on control system, and promote effective anti interference method.

The main ways,the coupling paths and the harmfulness of the interference,which produced great effect on the controlling system,were analyzed.

This review is concerned with the studies on the type, synthetic way and reconcilement of plant secondary metabolism, with the emphasis of the development of matabolism in recent years and discussing the connection of it s pathway and biological function in detail to form a theoretical base for it s exploitation and utilization, and to gain deep insight into secondary metabolism.

The subject is supported by Science and Technology Committee of Tianjin(05YFSYSF033), and the paper mainly studies around three elements of the electromagnetic disturbance which are disturbance source、coupling path and sensitive equipment, and focuses on radiation disturbance characteristics of measuring apparatus, and illustrates the suppression technologies.