目的表达白喉毒素无毒变异体CRM197，并考察其载体作用。
Objective To express the nontoxic mutant CRM197 of diphtheria toxin and study its effect as a carrier protein.
理想的纳米粒载体应有特异靶向性、药物释放可控性，无毒性以及可生物降解等。
The perfect nanoparticle vectors should be specific-targeting, controlled release, nontoxicity? biodegradation, and so on.
结论活性炭有较强的趋淋巴性，在淋巴结中驻留时间长，其本身无毒性，可作为淋巴结示踪剂及药物载体。
Conclusions the activated carbon can be used as a useful lymphatic tracer and drug carrier, for it is characterized by avirulence, high lymphatic tropism, long residence time in the lymph nodes.
将化学合成的模拟表位肽与载体BSA偶联后，以之建立无毒素的竞争酶联免疫检测方法，并与常规酶联免疫吸附检测方法及高效液相色谱比较。
A competitive ELISA was set up with a mimotope peptide conjugated to BSA carrier, and the new method was compared with conventional ELISA method and HPLC method.
聚乳酸的生物降解率较高且其降解产物无毒，已被广泛用作医用缝线、组织工程支架和药物控释载体。
As its biodegradability and biocompatibility, poly(lactide) (PLA) has been wildly used in medical suture, tissue engineering scaffold and drug delivery carrier.
壳聚糖是一种天然的生物可降解性，生物相容性好而且安全无毒的多糖，因而它成为基因治疗载体研究的热点。
Recently chitosan is focused in the research of gene delivery system for it is already known as a biocompatible, biodegradable and non-toxic polysaccharide.
壳聚糖是一种天然的生物可降解性，生物相容性好而且安全无毒的多糖，因而它成为基因治疗载体研究的热点。
Recently chitosan is focused in the research of gene delivery system for it is already known as a biocompatible, biodegradable and non-toxic polysaccharide.
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