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稻白叶枯病系统获得性抗性与非诱导部位活性氧及其清除系统的关系 总被引：1，自引：0，他引：1
试验选用水稻品种湘早籼３号（湘３,抗病品种）和浙辐８０２（浙８,感病品种）为材料,至６叶期,分别用稻白叶枯病菌的弱毒株（７５－１）和强毒株（７６－２５）在第５叶剪叶接种诱导;测定接种后１２、２４、４８、７２ｈ第６叶的ＳＯＤ活性、ＰＯＤ活性、ＭＤＡ含量及超氧阴离子产生速率的动态变化;并于第６ｄ在第６叶挑战接种７６－２５,挑战接种后１５ｄ测量病班长度。结果表明,２诱导因子均诱导２品种产生了系统获得性抗性（ＳＡＲ）,诱导效果浙８好于湘３,７６－２５好于７５－１。诱导处理后,２品种上位叶中ＳＯＤ活性及Ｏ·２产生速率有所降低,ＰＯＤ活性升高,ＭＤＡ含量变化不明显,这些变化从诱导后２４人开始,４８ｈ～７２ｈ的变化更大。以上结果表明诱导产生的ＳＡＲ与非诱导部位的组织中活性氧代谢密切相关 相似文献
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ＡＭＯＤＩＦＩＥＤＣＲＡＮＫ－ＮＩＣＯＬＳＯＮＳＣＨＥＭＥＦＯＲＴＨＥＩＮＩＴＩＡＬ－ＢＯＵＮＤＡＲＹＶＡＬＵＥＰＲＯＢＬＥＭＯＦＳＵＰＥＲＴＨＥＲＭＡＬＥＬＥＣＴＲＯＮＴＲＡＮＳＰＯＲＴＥＱＵＡＴＩＯＮＳｕｎＺｈｉｚｈｏｎｇ（孙志忠）（Ｄｅｐａｒｔ... 相似文献
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以氯金酸（ Ｈ Ａｕ Ｃｌ４）和柠檬酸三钠（ Ｎａ３ Ｃ６ Ｈ５ Ｏ７）还原法制备了 １８—２０ｍ ｍ 的胶体金溶液，并以此标记了葡萄球菌 Ａ 蛋白（ Ｓ Ｐ Ａ），制备出金标 Ｓ Ｐ Ａ 复合物。 相似文献
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ＡＮＡＬＹＳＩＳＯＦＴＨＥＦＩＥＬＤＳＳＣＡＴＴＥＲＥＤＦＲＯＭＡＴＷＯ－ＤＩＭＥＮＳＩＯＮＡＬＣＹＬＩＮＤＥＲＩＬＬＵＭＩＮＡＴＥＤＢＹＡＰＯＩＮＴＳＯＵＲＣＥＣｈｅｎｇＣｈｏｎｇｈｕ（程崇虎）ＺｈａｎｇＷｅｎｘｕｎ（章文勋）（ＳｔａｔｅＫｅｙＬａ... 相似文献
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新型助洗剂聚丙烯酸钠的合成与应用(英文) 总被引：2，自引：0，他引：2
以过硫酸钾为引发剂,在中性水溶液介质中合成了低分子量的聚丙烯酸钠（ＰＡＡ－Ｎａ）,研究了反应条件对粘均分子量的影响,并测定了产品与其它助洗剂的抑制ＣａＣＯ３析出的临界值．以扫描电镜ＳＥＭ观察并证明了在ＰＡＡ－Ｎａ存在下ＣａＣＯ３晶体可产生缺陷．洗涤应用实验表明,所合成的ＰＡＡ－Ｎａ助洗剂可部分替代三聚磷酸钠（ＳＴＰＰ）,在低磷洗衣粉中具有很大发展潜力． 相似文献
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１９９８年２月，美国医学院校协会（ＡＡＭＣ）发表了“医学院校学习目标研究报告 Ⅰ”（ＭＳＯＰ），这项计划的目的是提出一批高水平的学习目标，以便于医学院校的校长和教师作为参照来审核各自的医学生教育计划，同时还提出一些便于各校实施教育计划改革的策略（见本刊１９９９年第３期）。日前，ＡＡＭＣ主席在访华的学术报告中特别介绍了ＭＳＯＰ，为使我国医学教育工作者了解该项目的研究进展，特将ＭＳＯＰ研究报告Ⅱ（Ａｃａｄｅｍｉｃ Ｍｅｄｉｃｉｎｅ ７４（２）： １３０－１４１）编译于后。 在ＭＳＯＰ研究报告中有三个学习… 相似文献
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[目的]探讨腹膜、腹膜后间质瘤的临床病理特点.[方法]对大连大学附属医院近3a收治11例腹膜、腹膜后间质瘤患者的临床病理特点及用免疫组织化学方法检测CD117、CD34、SMA、S100蛋白表达的情况进行回顾性分析.[结果]11例患者中发生于结肠(横结肠)上区3例,结肠(横结肠)下区8例.肿瘤未能完整切除者4例.肿瘤大小≤2cm者2例,>2～5cm者1例,>5～10cm者3例,>10cm者5例.细胞形态以梭形细胞为主9例,以上皮样细胞为主2例.11例患者CD117全部阳性,CD34阳性7例,SMA阳性5例,S100全阴性.[结论]结果提示腹膜、腹膜后间质瘤作为GIST的一种特殊类型,有着其自身的临床病理特点. 相似文献
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广州二沙岛宏城公园植物配置调查研究 总被引：1，自引：0，他引：1
李海生 《广东教育学院学报》2011,(3):72-79
对广州二沙岛宏城公园植物配置进行了调查研究.结果表明：宏城公园主要栽植的乔木有48种,灌木34种,草本植物26种,藤本植物5种.乔、灌、草合理搭配,营造了多层次的绿化效果;观花、观叶植物较丰富,四季有花、四季常绿;植物配置与园林建筑、雕塑等有机结合,效果美观.建议：对公园部分植物的种类、数量和配置方式进行调整;加强养护管理,充分发挥植物的特色;对配置的植物进行必要的简介等. 相似文献
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Research into gender bias in attitudes, access, and effectiveness associated with computers has produced conflicting results, resulting in conflicting opinions as to whether a technological gender gap favoring male students exists. No previous study, however, has ever demonstrated a preference for female use of a particular computer application. This work describes gender differences in the use of on-line (chat room) tutorials by non-traditional chemistry students enrolled in distance learning sections of a general chemistry course. Higher percentages of female students participated in the on-line tutorials and they participated with greater frequency than male students. Furthermore, the correlation between frequency of participation and course performance was higher among the female students. Various explanations for this unusual gender bias are offered, and the conclusion that the diversity of computer applications available today requires that research into gender bias refrain from viewing the computer as a single entity is supported. 相似文献
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The present longitudinal study investigated the predictive power of preschool linguistic skills and early family factors on children's comprehensive literacy skills at the end of primary school in 262 Chinese children. The results indicated that a substantial (20–34%) share of variance of 5th grade (age 11) literacy skills in Chinese could be explained by early family factors (age 3) and linguistic skills (age 3–age 5). Family socioeconomic status and parent-child reading tuition were associated with different literacy measures. A differential pattern of prediction was also observed among different literacy skills. Furthermore, path analyses indicated that the relationships between early family factors and literacy skills at age 11 were mediated by specific linguistic and cognitive skills at preschool. 相似文献
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按Levan等(1964)标准,对万年青进行核型分析发现,核型公式为2n=34=1M+9m+5sm+1st+1t,为2B型(Stebbin,1971).同时,对万年青有丝分裂各时期的特征进行了研究. 相似文献
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经过三年的调查研究，报道了子午岭野生杀虫维管植物42科68属88种．其中乔木8科9属10种；灌木8科8属11种；木质藤本3科3属3种；多年生草本20科34属39种；一、二年生草本10科16属21种；草质藤本3科3属4种．介绍了子午岭21种主要野生杀虫植物，并介绍了子午岭林区野生杀虫植物的其他用途，提出了开发利用和保护的具体建议． 相似文献
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柯美元 《顺德职业技术学院学报》2012,10(1):1-3
研究了流动温压工艺的成形温度对W-34Ni-5Fe混合粉末横向压力的影响及横向压力和生坯密度在横向距离上的分布,并进行了带螺纹孔的十字形零件的成形实验。实验结果表明,流动温压成形时,混合粉末在横向距离上存在较大的压力分布,流动温压工艺在十字形零件的纵向和横向都能成形出完好的内螺纹。 相似文献
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沈昌明 《合肥师范学院学报》2014,(2):93-95
许村是许村镇政府所在地,是歙县北方政治文化中心,为徽青古道的中转站,地理位置十分重要。其方言有声母27个、韵母34个、声调5个。与共同语相比,声韵调各具特点。 相似文献
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Xun Tan Ye-wen Jiang Yi-jun Huang Song-hua Hu 《Journal of Zhejiang University. Science. B》2009,10(4):280-284
This study was designed to investigate persistence of gentamicin residues in milk after the intramammary treatment of lactating cows for mastitis. Milk samples were collected at a 1-d interval after the last administration from 34 individual cows that had received intramammary infusions of gentamicin. The doses and treatment times evaluated in this study represented those that have been applied by veterinarians in practice. The tetrazolium chloride assay was used to determine whether there were sig-nificant residues of the antibiotic in the samples. Persistence of detectable drug residues in milk from 33 cows (28 cows, <6 infusions at≤0.7 g gentamicin; and 5 cows, 2 infusions at 0.8 g gentamicin) did not exceed 5 d; but 1 cow (5 infusions at 0.8 g gentamicin) had detectable residues in its milk for 9 d. Our results suggest that a 5-d milk withdrawal period might be insufficient to secure the clearance of the contamination of gentamicin, because treatment times and dosages contribute to the antibiotic clearance. A larger scale of samples are needed for further investigations. 相似文献