黄芪多糖对马立克氏病的作用

自由基通过影响核酸、脂肪、蛋白质、糖等而对机体造成损害，马立克氏病的发生、发展与之作用密不可分，黄芪多糖通过增强机体抵抗力，调节自由基反应系统两方面防止肿瘤发生，抑制马立克氏病毒造成的损害，并且黄芪多糖无毒无害，将之应用于马立克氏病的防治会起到明显效果。     

政策法规·国家标准·行业标准——活化乳和乳过氧化物酶体系保存生鲜牛乳实施规范

本标准规定了生鲜牛奶(包括水牛奶，下同)挤下后，在贮存，搜集和运输到乳品加工厂期间利用乳过氧化物酶体系防止其细菌性腐坏的方法。     

cDNA Cloning and Sequence Analysis of Rice Sbel and Sbe3 Genes

Two starch-branching enzyme (SBE) in rice, is known to be a key enzyme in amylopectin biosynthesis. The cDNA of two SBE(starch-branching enzyme) genes SheI and Shed encoding SBE Ⅰ and SBE Ⅲ (two major isoforms in rice) were cloned by an improved RT-PCR technique, from a template cDNA libray, derived from the total mRNAs extracted from the immature seeds of a japonica rice Wuyunjing 7. DNA sequence analysis showed that the size of the cloned SheI and Shed cDNAs were 2490 and 2481 bp long, respectively, including their entire coding sequences. Comparison analysis indicated that the nucleotide sequence of She3 was the same as that of shed (Genbank Accession No. D16201) as reported previously. There were only four base-pairs difference,which resulted in changes of two deduced amino acids between the cloned She1 cDNA and the reported she1 (Genbank Accession No. D11082). The cloned SheI and Shed cDNAs make it possible to improve rice starch quality through genetic engineering.     

木聚糖酶产生菌的筛选及酶学性质研究

从实验室保藏的13株菌株中筛选到l株高产木聚糖酶菌株-黑曲霉2107,酶谱检测发现,该茵株产2种木聚糖酶X-1和X-2.X-1和X-2的最适反应温度都为50℃,并在30～50℃都较稳定.X-1的半失活温度50～55℃,X-2的半失活温度为55～60℃.X-1的最适pH约为5,pH 4～10较稳定;X-2的最适pH约为3和4之间,pH 2～5之间较稳定.各种金属离子对2种酶都有不同程度的抑制作用.