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1Study on Acute Toxicity of Purified Protein HAS1 Expression in KM Mice显示文摘[Objectives]The antifungal protein HAS1 newly obtained was evaluated for acute toxicity safety in KM mice according to relevant national regulations,so as to eliminate people s concerns about the safety of transgenic plants.[Methods]The acute toxicity of the purified protein HAS1 was observed by intragastric administration of mice,and the poisoning symptoms,poisoning degree,recovery and death were observed.[Results]No abnormal toxicity symptoms were observed in the test group,the vehicle control group and the blank control group.The main tissues and organs were not abnormal in gross anatomy.The average body weight of each group showed an increasing trend compared with before administration at 1,3,7,11 and 14 d after administration.It was found that after giving the purified protein HAS1 to KM mice at a cumulative dose of 64 mg/kg a day,no obvious toxicity was observed in the acute toxicity test,indicating that the test substance was non-toxic by oral administration.[Conclusions]This study provides a basis for further use of the protein and its coding genes.Guoru XIONG Gengfeng ZHAO Jungang WANG Guilan XING Shuzhen ZHANG 2019Agricultural Biotechnology2019,8,4:1
2Skin Anaphylaxis Test of Purified Protein HAS1 in Cavies显示文摘The antifungal protein HAS1 is a new antifungal protein isolated from the genome of Bacillus subtilis HAS,which has a good inhibitory effect on various pathogenic fungi in sugarcane.This study aimed at evaluating the immunological transfer reaction of the test sample through repeated skin contact by observing whether the cavy skin repeatedly exposed to purified protein HAS1 suffers from allergic reaction and how strong is the allergic reaction.The results showed that the test group and the vehicle control group exhibited no allergic reaction in the skin immediately and at 24,48 and 72 h and had an mean reaction score and a sensitization rate both of 0,so the results of the naked eye observation were both nonallergenic to cavy skin;and in the positive control group,the cavies were observed to be highly sensitized immediately after removing the drug,mildly sensitized at 24 h,and not sensitized at 48 and 72 h,which meant the skin allergy was alleviated with the observation time.It is suggested that the purified protein HAS1 is negative for cavy skin anaphylaxis test (nonallergenic to cavy skin),which provides an experimental basis for further utilization of the protein and its coding gene.Guoru XIONG Gengfeng ZHAO Jungang WANG Guilan XING Shuzhen ZHANG 2019Agricultural Biotechnology2019,8,5:0
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