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家畜遗传标记方法的进展 总被引:3,自引:0,他引:3
选择合适的遗传档记对于研究家畜遗传多态现象具有十分重要的意义,家畜遗传标记从最早的形成标记,进入细胞水平标记,发展到目前的分子水平标记,各种方法互有利弊,其中以RAPD为代表的分子标记法最为理想,已成功目前及未来家畜遗传多态性研究中最有效的手段,以及进行生物技术改造和利用生物的依据。 相似文献
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遗传学将可识别的等位基因称为遗传标记。传统的遗传学研究和育种工作主要是借助形态学、细胞学和生理生化指标等遗传标记来进行的。就蜜蜂而言,多数遗传标记是根据生物学性状的形成而进行判别,检测时基本要以活体形式,如蜜蜂的抗病基因是以人工饲养的蜂群抗病力强弱为标记,抗螨 相似文献
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笔者对遗传标记,近年来在形态标记、细胞学标记、蛋白质多态性、分子标记技术方面的研究及其在山羊起源分化中的研究进展作了概述。 相似文献
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There may be a great potential in the use of diagnostic "markers" of osteoarthritis in synovial fluid to diagnose the disease in an earlier stage and perhaps assess the severity of the disease and monitor the effect of a treatment. In the present study, potential markers are characterized, discussed, and grouped according to the latest knowledge on the etiology, pathogenesis, and pathology of osteoarthritis. They are grouped according to their origin as either cartilage degradation products, or related to the mechanisms of cartilage degradation, or related to chron-drocytic anabolic activity during disease, or related to genetic disorders. Also potential markers that have not yet been studied clinically or experimentally are discussed. Examples of the progress that has been made in human medicine approaching reliable diagnostic markers that should also be tried in veterinary medicine are described. 相似文献
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本文对陕西省关中地区的牛与牛耕、出土文物“牛”、农业自然资源、粮食与饲料作物、耕牛饲养管理和牛的繁殖与选育诸方面因素的历史发展状况作了分析论证,认为:唐代是秦川牛的形成时期。 相似文献
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运动场草坪最佳坪床结构的研究——以草坪品质综合评定得分为指标 总被引:4,自引:0,他引:4
本研究以运动场草坪坪床的床土和机械组成(床土含砂量)、基肥磷(P_2O_5)和氮(N)为因素,以草坪品质综合评定得分为衡量指标,利用三因素饱和D——最优设计对运动场草坪坪床结构的优化问题进行了探讨。通过实验得出,最佳坪床结构的三因素水平分别为:床土含砂量67.0820~77.9180%,磷(P_2O_5)0.0131~0.1330克/千克·土,氮(N)0.1122~0.2045克/千克·土;最优三因素水平为:床土含砂量61.8350%,磷0.1067克/千克·土,氮0.1161克/千克·土。文中还建立了草坪品质综合评定得分与坪床结构三因素显著相关的回归模型。 相似文献
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《科技视界》2017,(1)
教学方法及内容创新与课程建设相辅相成、相互促进。教学方法及内容创新是道路交通事故处理课程建设的重要切入点,为满足当前公安体制改革教学需要,道路交通事故处理课程建设对教学方法及内容创新提出了新要求。因此,应在建设道路交通事故处理课程中积极推进教学方法及内容的创新。笔者就以我国无人驾驶车辆事故责任主体划分为例进行研究。当前众多的汽车厂商、互联网公司都致力于研发无人驾驶汽车,无人驾驶技术无疑是未来交通的主要发展方向。与此同时,有关于无人驾驶汽车发生道路交通事故责任主体划分的争议也引起了关注,关注点较多集中在:对产品责任方面的顾虑是否会使得这项技术发展缓慢,更可能使人们与这项技术无缘。而我国目前所施行的《中华人民共和国道路交通安全法》及其相关法律、法规及其相关司法解释均无针对无人驾驶车辆发生道路交通事故责任主体划分标准。本文旨对无人驾驶车辆发生道路交通事故责任主体划分标准予以探讨。 相似文献
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W. Grant Guilford BVSc PhD Jan Komtebedde DVM Steve C. Haskins DVM MS Robert J. Higgins BVSc PhD Jack R. Snyder DVM PhD Donald R Strombeck DVM PhD 《Journal of Veterinary Emergency and Critical Care》1995,5(1):51-60
Gastric dilatation-volvulus (GDV) was surgiclly induced in 10 dogs. Five of the dogs were pretreated with 50 mg/kg PO of allopurinol to determine the effect of xanthine oxidase inhibition on the pathophysiology of GDV. After 150 minutes, the GDV was corrected, and lactated Ringer's solution was administered intravenoulsy (resuscitation). Two hundred forty minutes after relief fo GDV, the dogs were euthanatized without recovery from anesthesia. Administration of allopurinol was associated with a reduced (P<0.01) incidence of hepatic necrosis and a lower (P<0.045) serum phosphorus level than observed in the control group at the end of the experiment. The increase in base deficit in the allopurinol-treated group after resuscitation was also less(P<0.045) than the control group. In conclusion, this study suggests that inhibition of xanthine oxidase-derived oxygen free radicals protects against hepatic necrosis in dogs with GDV. Resuscitation appears to be a time of profound physiologic stress for dogs with GDV. 相似文献