谷粒反弹运动轨迹的计算机模拟     

柏雪源  韩颖 《黑龙江八一农垦大学学报》1993,7(2):38-42

为了分析康拜因谷物损失,对谷粒在康拜因清选仓内的运动轨迹及其撞在鱼鳞筛片后反弹运动轨迹进行了计算机模拟。在计算机模拟程序中运用了数值分析的方法进行积分运算.通过对小麦粒的模拟计算,发现增加清选气流速度的垂直分量及鱼鳞筛片的开度可以减少谷物损失。  相似文献   

Structural basis for substrate delivery by acyl carrier protein in the yeast fatty acid synthase     

Leibundgut M  Jenni S  Frick C  Ban N 《Science (New York, N.Y.)》2007,316(5822):288-290

In the multifunctional fungal fatty acid synthase (FAS), the acyl carrier protein (ACP) domain shuttles reaction intermediates covalently attached to its prosthetic phosphopantetheine group between the different enzymatic centers of the reaction cycle. Here, we report the structure of the Saccharomyces cerevisiae FAS determined at 3.1 angstrom resolution with its ACP stalled at the active site of ketoacyl synthase. The ACP contacts the base of the reaction chamber through conserved, charge-complementary surfaces, which optimally position the ACP toward the catalytic cleft of ketoacyl synthase. The conformation of the prosthetic group suggests a switchblade mechanism for acyl chain delivery to the active site of the enzyme.  相似文献   

Quantitative trait loci for photosynthetic pigment concentration in a doubled-haploid population of Pak Choi (Brassica rapa ssp. chinensis var. communis Tsen et Lee)     

Q. Wang  J.F Geng  Y. Cheng  Q.Y. Ban  J.W Zou 《The Journal of Horticultural Science and Biotechnology》2013,88(5):421-426

Summary

Quantitative trait loci (QTL) mapping and marker development are essential steps in any molecular breeding programme. In this study, QTL for photosynthetic pigment concentration were identified using a doubled-haploid (DH) population of 112 lines derived from an F₁ hybrid of Pak Choi, ‘Shulv’, obtained from a cross between Brassica rapa lines SW-13 and SU-124 through microspore culture. QTL mapping was carried out using a modification to the map of ‘Shulv’. Alignment of the linkage groups was carried out with those of reference B. rapa maps, allowing the assignment of these groups as A01 – A10. In total, 11 QTL were associated with photosynthetic pigment concentration and identified on linkage groups A05, A08, and A10. The maximum phenotypic variance for a single QTL was 38.0%. Markers closely linked to these QTL could assist in the development of Pak Choi cultivars with increased yield, due to having improved photosynthetic capabilities.  相似文献   

(E)‐β‐farnesene synthase gene affects aphid behavior in transgenic Medicago sativa     

Xuemin Wang  Yuhao Gao  Zhihong Chen  Jindong Li  Jianping Huang  Jiangbo Cao  Miaomiao Cui  Liping Ban 《Pest management science》2019,75(3):622-631

  相似文献   

山西省冬小麦主要病虫害气象等级预报模型   总被引：4，自引：1，他引：3  

王志伟  张东霞  马雅丽  班胜林 《中国农学通报》2010,26(11):267-271

气象条件是影响农作物病虫害的主要因子,且与作物的发育期密切相关,特别是在特殊年份,如果模型所筛选的因子中较常年有明显的改变,预测结果与实际结果相差较大,因此各预测模型都具有一定的局限性。为提高数理统计预报的实用性,需要采用多年的历史资料,同时在实际工作中应采用尽量多的方法进行预测,以最大限度地获得较高的预测准确率。本文以山西冬小麦的主要病虫害（白粉病、条锈病、麦蜘蛛）为研究对象,研究其发生流行的气象条件预报指标,并建立山西省冬小麦主要病虫害发生的气象条件预测模型,进行山西省冬小麦主要病虫害发生的气象条件预测。通过历史资料进行回测验证,历史拟合准确率达到90%以上,说明应用该方法所建模型在一般年份可以进行冬小麦条锈病、白粉病、麦蜘蛛的预测。  相似文献   

生姜瘟病的发生诱因调查与综合防治技术   总被引：1，自引：0，他引：1  

闫锋  班建设  张建华  郑志强 《北京农业》2010,(15)

在大田生产试验中,对姜腐烂病或青枯病,侵害地下茎及根部的病理,病状以及防治技术,进行了深入调查研究,对生姜瘟病多种防治技术进行了比较,提出了姜瘟防治的简便易行、无公害的措施办法。  相似文献   

Artificial and natural cross breeding between Atlantic salmon and salmonids currently present in Japan     

Masatoshi Ban  Hiroyuki Nagoya  Shunpei Sato  Hirohumi Yaegashi  Masaki Ichimura  Nobuhiro Sato 《Fisheries Science》2013,79(6):967-975

We evaluated the potential for hybridization between Atlantic salmon and salmonids currently present in Japan. We performed artificial and natural crosses and tested for hybridization using short interspersed elements. We documented the occurrence of hybrids and gynogenesis following artificial crossing. However, the survival rate of these offspring was low (<2 % to the fry stage). We were unable to obtain viable offspring from natural crosses of Atlantic salmon and chum salmon or masu salmon. Our results suggest that there is little risk of hybridization between Atlantic salmon and salmonids that are currently present in the wild in Japan. Furthermore, our results suggest that gynogenesis may occur naturally.  相似文献   

Recasting shortfalls of marine protected areas as opportunities through adaptive management     

Natalie C. Ban  Joshua E. Cinner  Vanessa M. Adams  Morena Mills  Glenn R. Almany  Stephen S. Ban  Laurence J. Mccook  Alan White 《水产资源保护:海洋与淡水生态系统》2012,22(2):262-271

灰飞虱对几种杀虫剂的抗性   总被引：4，自引：0，他引：4  

班兰凤  高聪芬  郭昊岩 《植物保护》2015,41(1):158-162

采用稻苗浸渍法测定了灰飞虱对7种常用杀虫剂的抗性。2011年监测了我国江苏、浙江、安徽三省9个灰飞虱种群对噻虫嗪、烯啶虫胺、毒死蜱、吡蚜酮、噻嗪酮、高效氯氰菊酯及氟虫腈的抗性。结果表明:灰飞虱对噻虫嗪都处于敏感阶段(0.6~2.2倍);对烯啶虫胺处于敏感阶段(0.8~3.0倍);对毒死蜱产生了中-高水平抗性(17.5~83.6倍);对吡蚜酮为敏感到低水平抗性(1.9~5.5倍);对噻嗪酮的抗性为高-极高水平(136.4~271.1倍);对高效氯氰菊酯的抗性为低-中等水平(5.2~34.9倍);对氟虫腈为低水平抗性(0.9~8.0倍)。基于灰飞虱对7种药剂的抗性情况,对田间治理灰飞虱合理使用药剂进行了讨论。  相似文献   

两种核桃干燥设备作业性能对比     

田翔  李忠新  杨莉玲  闫圣坤  沈晓贺  王庆惠  班婷  王冰 《农业工程》2014,4(4):76-78

通过对国内核桃干燥设备的调查研究,针对干燥设备能耗大、均匀性差、干燥后产品品质不佳等现状,选择5HH-3000型核桃烘干机与HG-120型果品烘干机两种干燥设备为试验研究对象,对比分析干燥设备实际工作的性能指标,结果证明,5HH-3000机型的性能优于HG-120型干燥设备。为干燥设备的优化改进提供了有力证明,也为机型的选择和规模化生产提供了理论依据。   相似文献