首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   3篇
  免费   0篇
  2篇
农作物   1篇
  2008年   1篇
  2007年   2篇
排序方式: 共有3条查询结果,搜索用时 6 毫秒
1
1.
The polished Job's tears ( Coix lachryma-jobi L.) seeds, dark and white husk types, were sequentially extracted by hot water (75 degrees C) and 0.5 M NaOH solution. Nonstarch polysaccharides were not found in the water extract but were present in the alkali extract. The major components of the alkali extract from both Job's tears were protein, ash, and nonstarch polysaccharides, mainly arabinoxylans. The high arabinose to xylose ratio of 1.25 and 1.24 indicated a highly substituted structure. The average molecular weight (MW) of arabinoxylans of the dark and white husk types were 741,000 Da (Pd 1.5) and 1,449,000 Da (Pd 2.6), respectively, and their average MW reduced after treatment with protease. The alkali extractable arabinoxylans were elucidated to have a (1,4)-linked beta- d-xylan main chain highly substituted with single arabinose units. The results showed that the alpha- l-arabinofuranosyl residues (Ara f) were attached to the main chain mostly at O-3, followed by both O-2 and O-3 of xylopyranosyl residues (Xyl p).  相似文献   
2.
The effects of extrusion temperature, 150-190 degrees C, and torque, 50-70%, on the content and configuration of conjugated linoleic acids (CLA) in corn extrudates were analyzed by GC and HPLC. At a temperature of 150 degrees C, CLA content increased from 1.2 mg/g of oil in feed to 7.8 mg/g of oil in corn extrudates. A decrease in total CLA (P < 0.05) was obtained when the product temperature was further increased to 190 degrees C. Alteration of CLA geometrical configuration was observed at higher extrusion temperatures. trans,trans-CLA significantly increased (P < 0.05) from 10.2% in feed to 11.9% of CLA at the extrusion condition of 190 degrees C and 70% torque. The highest expansion of extrudates was found at the product temperature of 150 degrees C and 70% torque. This extrusion condition also gave the maximum total CLA content and minimum trans,trans-CLA formation.  相似文献   
3.
大豆种子成熟至收获期间如遇高温高湿天气,种子活力及活性会急剧下降,这就是所谓的田间老化(field weathering).田间老化是热带、亚热带地区大豆生产的主要限制因素之一.本研究旨在寻找与田间老化性状相连锁的DNA标记并将其应用于辅助选择育种.为此,利用修改的培养箱老化法和人工控制老化法对大豆品种Chiangmai 60(敏感),GC10981(抵抗)及其F2群体(139个体)进行了鉴定.在两种处理条件下,F2代群体的种子发芽率及活性均为正态分布,说明大豆种子田间老化抗性受多个基因控制.根据F2代个体的种子发芽率及活性,6个高抗个体及7个高感个体的DNA分别被混合为抗性池和感性池,并利用AFLP标记进行了混合群体分析(Bulk Segregant Analysis).从扩增的2162个标记中,发现了5个可能于大豆种子田间抗性相连锁的片段.通过DNA克隆和测序,设计了5对引物用于从大豆总DNA中扩增相应的片段.其中3对引物扩增的片段差异太小或未能扩增正确大小的片段,没能用于F2群体.引物Eaag/Mcac-233和Eact/Mctt-157能扩增出差异明显的多态性,通过对F2代群体的分析,这2个标记属同一连锁群,遗传距离为25.8cM.QTL分析结果显示有一个QTL位于这两个标记之间,距Eaag/Meac-233约14cM,可以解释29.7%的变异.用这两对引物对整个F2群体进行筛选,20个个体属于抗性群体,结合抗性鉴定的结果,7个个体被用于与Chiangmai 60进行回交.18个BC1F1个体(41.9%)的抗性高于其亲本的平均值.说明这些标记进行可以被用于大豆田间老化抗性的辅助筛选研究.  相似文献   
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号