【摘 要】
：
Thirteen fractions from the pathogenic plant fungus Setosphaeria turcica race 1 were separated and collected using high performance liquid chromatography (HPLC)
【机 构】
：
Mycotoxin Laboratory,College of Chemistry
论文部分内容阅读
Thirteen fractions from the pathogenic plant fungus Setosphaeria turcica race 1 were separated and collected using high performance liquid chromatography (HPLC). Their toxic activities were assayed through leaf puncturing on corn differentials (OH43, OH43Htl, OH43Ht2, and OH43HtN), and the results revealed that eight fractions were toxic and fraction 6 was specifically toxic to OH43Htl, which could be taken as a gene-selective toxin fraction. Fraction 6 was finely purified via HPLC and condensed by freeze desiccation. Its chemical structure was analyzed with EI-MS, IR, HMBC, 1H-NMR, and two-dimensional NMR. The results suggested that fraction 6 contained an unsaturated double bond, carbonyl and methylene groups with molecular weight of 142.
其他文献
腺肌胃炎，是由细菌病毒等病原体协同免疫抑制引起的以肌内金溃疡、消化平衡紊乱为特征的消化道疾病。家禽感染后体重严重不足，与标准值差异巨大。目前，该病病原的说法众说纷纭，观
独活来源于伞形科植物重齿毛当归的干燥根，生于山坡林下或林缘草丛中，为我国传统的常用中药材，甘肃岷县、天水、平凉等地亦有栽培，独活种植是一条快速发展的致富途径。
猪是单胃杂食动物，呕吐神经轻易激发症状，发生某些流行症，容易引发呕吐的病症。本文分析了各种猪呕吐性疾病的引发缘由和防控措施。在实际养殖过程中掌控这些原因及其激发呕吐的
森林防火是保护生态环境的需要，也是构建和谐社会的需要。珲春市处于中俄交界中，在中俄边境防火带的建设中起到了至关重要的作用。近年来党和政府加大了对森林火灾的重视度，特别
为筛选出适应晴隆县1100m海拔种植的高产优质水稻新品种而进行此对比试验，试验结果表明，容18优662、宜香优2115具有产量高、适应性特强的特性，可在晴隆县1100m海拔及以下地区大
肠病相关性T细胞淋巴瘤( enteropathy-associat-ed T cell lymphoma,EATCL)是1985年Isaacson首先提出的起源于肠上皮内T淋巴细胞的恶性肿瘤[1]。2002年WHO新分类对T细胞和NK
通过背景和现状分析，我们认为制约儿童康复机构儿童康复学科发展的主要因素为：一是儿童康复工作的相关政策法规及行业标准不完善；二是缺乏康复医学诊疗特色；三是专业人员极度匮乏
小学英语阅读教学，是小学英语教学中的重要组成部分，很大程度上决定了小学英语教学的成功与否。由于小学生的年龄小、学习能力较低和传统教学模式中存在很大的缺陷，导致教学效果
A rapid, simple and practical high-performance liquid chromatography method coupled with diode array detector (HPLC–DAD) was developed to evaluate the quality
采用PCR-RFLP技术,对100只玫瑰冠鸡的胰岛素样生长因子一I(IGF-I)基因的5端调控区进行遗传多态性研究,该调控区的扩增产物经.PstI酶切后出现"-/-""+/-""+/+"3种基因型,其基因