toxic type

Three of fifty non-toxic EVC strains contain tcpA gene, one contains t 2 type, others contain two new types.

50株EVC 非 产毒株中只有3株携带tcpA基因, 1株为t2型, 另2株为2种新类型.

Shiga toxin ( ShT), which synthesized by Shigella dysenteriae type ⅰ, is a kind of potent exotoxin with neuro-toxic, cytotoxic and enterotoxic activities, and is an important factors of Shigellosis.

志贺毒素（ShT）是由Ⅰ型痢疾志贺菌产生的一种重要的致病毒力因子，具有细胞毒、肠毒和神经毒三种毒性作用。

The use method, the pesticidal effect and the safe interval of some pesticides, including contacting killing type, systematic type, stomach toxic type and fumigant type, were brought forward on the base of the characteristic and the acting manner of some common chemical pesticide.

根据常用几种化学杀虫剂的特性、作用方式，研究了触杀型、内吸型、胃毒型、熏蒸型杀虫剂的使用方法、灭虫效果及安全间隔期。

Third, encourage enterprises to non-use of phthalate plasticizers, to switch to non-toxic environmental protection type plasticizers.

第三, 鼓励企业不使用含邻苯二甲酸酯的增塑剂, 改用环保 无毒 型增塑剂.