The effects of abiotic factors such as acid solvent、metal ion、ion strength and pH on the antibacterial activitiesof chitosan were investigated by using two kinds of typical pathogens: Escherichia coli and Staphylococcus aureus as testmicroorganisms.

In this study, effects of various abiotic factors such as acid solutions (acetic acid, nitric acid, hydrochloric acid and citric acid), metal ions (Zn2+, K+, Fe3+ and Cu2+), ionic strength ( with Na+ ion intensity as the reference: 0, 0.

Safety evaluation of antibiotic resistance genes in transgenic plants;

Frost heave causation and prevention in roadbed;

This paper analyzes the kinds and causations of concrete crack, puts forward specific methods to avoid cracking.

Analysis of the causes of linear chromatism on the surface of the cold rolled stainless strip and its improvement measures;

Study on the causes of cracks in mass concrete and prevention and treatment measures;

Simple Analysis of Free Red-light Cingulum Caused in JZXC-480 Railway Circuit and Prevention;

Types and reasons of ecotourism environmental problems;

This paper discussion the multi cultures of physical education hide curriculum,and the reason for the developing and reforming the curriculum of physical education and health.

The author will analyse the reasons of the wrong movement and figour out the measures to it.

A preliminary study on the causes of the natural disaster;

Study on the Cause of Trunk Bore s Spreading Occurrence to the Secondary Coniferous Forest;

Progress of the Causes of Tomato Navel Rot;