利用体细胞杂种克隆板进行染色体区域定位的数据分析

利用猪×啮齿类体细胞杂种克隆板对本室新克隆和分离的猪胶质细胞原纤维酸性蛋白(glialfibrillaryacidicprotein,GFAP)基因进行染色体区域定位，对应用体细胞杂种克隆板进行染色体区域定位的试验数据统计的基本过程和方法进行了分析，研究结果表明猪GFAP基因定位于染色体12p11-(2/3p13)区域（P＜0.1%），并讨论了特殊试验数据的分析问题。     

Localization of the Laevigatum Resistance Gene MlLa against Powdery Mildew in the Barley Genome by the Use of RFLP Markers

RFLP markers which were previously assigned to chromosome 2 (2H) were found to detect polymorphism between the cv. ‘Pallas’ and a near isogenic line carrying the Laevigatum resistance gene MlLa. Linkage analysis carried out with two sets of DH lines derived from the crosses ‘RisøS’בSultan’ and ‘Alf’בVogelsanger Gold 2’ confirmed three DNA probes closely linked with the MlLa locus.     

侵蚀坡地果园土壤—植被组分中N、P、K质量分数及其分布

土壤分室是 N、P、K的主要贮存库 ,分别占土壤—植被组分中该元素总贮量的 90 .2 %、98.7%和 99.6% .土壤分室中 ,N、P质量分数和贮量随着深度的增加而减少 ,而 K在不同土层差异不明显 ;果树分室中 ,三元素质量分数最高为叶片 ,贮量最高为根部 ;地被物分室中 ,三元素质量分数地上部高于地下部 ,贮量 N素地下部高于地上部 ,而 P、K地上部高于地下部     

一种具有三角模糊系数的指派问题

定义了一种系数为三角模糊数的指派问题,利用三角模糊数的可能度排序方法,给出了该问题的求解方法.最后结合一数值算例对该种方法进行了说明.     

棉花芦管育苗新技术研究 Ⅲ.芦管育苗对棉苗物质积累与分配的影响初报

试验于1996～1998 年在扬州大学农学院内进行,供试棉花品种为苏棉8 号。春夏播棉芦管与营养钵育苗移栽对比试验结果指出,芦管育苗移栽棉在现蕾时,其单株干重与对照无显著差异。但是,在幼苗期阶段,单株干重显著低于对照;并对根、茎、叶物质积累和分配均产生不利影响,这种物质生产弱势是由芦管环境对棉苗早期限根控叶而使同化产物减少所致;在大苗期阶段,芦管棉苗植株干物质积累逐渐加速; 并随着叶面积增大,光合产物增多,营养中心下移,根/冠干重比明显超过对照,出现了下层根旺发优势,形成了强根壮株的良好长势。因此,提高播种质量,改善芦管苗早期的根际营养环境和扩大叶面积,增强物质生产能力,并充分利用大苗期发根优势,将是芦管育苗移栽棉壮苗早发的关键。     

Circle of life: the common hamster (Cricetus cricetus) adaptations to the urban environment

Traditionally, urbanization has been seen as a negative phenomenon for biota. However, changes in the environmental parameters induced by urbanization might be favorable for some species. Over the past half‐century, the common hamster has actively populated cities, establishing populations in some European, Russian and Kazakhstan cities. Based on integrative methods, we investigated free‐range common hamsters inhabiting Simferopol from 2015 to 2018 to reveal possible adaptations to the urbanized environment across several parameters, including lifespan, hibernation period, reproductive activity and body mass. Results show that in urban areas, the common hamster demonstrates an extremely short hibernation period compared to other localities, possibly due to enhanced food resources from urban forestry (walnuts, locus and hazelnut), allowing the species to start breeding very early (February) and finish as late as October. We present the first evidence of polyandry for this species: mating of receptive females with several males and subsequent confirmation of multiple paternity. Despite high reproductive potential, the lifespan of the common hamster in urban conditions is generally very short (less than 1 year). We speculate that in the process of synurbization, the common hamster's innate plasticity across many life history traits permits it to successfully colonize throughout a wide range of habitats, with the ability to form novel adaptations to urban environments.     

Inference of admixture in the endangered Blanca Cacereña bovine breed by microsatellite analyses

Blanca Cacereña cattle is the most threatened Spanish bovine breed. Although a Conservation Plan, exists, the little reproductive success and some chromosome abnormality were observed in the breed making it advisable to extend the genetic basis of the animals opening up the recorded herd book to new animals from local farms. However, the crossing with meat breeds like Charolais cattle is used to improve the commercial product. We used 30 microsatellites to determine the Charolais genetic influence in the current herds by the identification of the hybrids and to recognize new “purebred” animals in the “Blanca Cacereña” population. Blood samples were taken from animals of Blanca Cacereña bovine breed (112 animals with pedigree and 68 without pedigree), Charolais breed (60 animals) as a breed used commercially in crosses with Blanca Cacereña, and Retinta breed (60 animals) as a reference population. STRUCTURE analyses were performed with or without prior population information to assign individuals to breed, identifying admixed individuals, and inferring their ancestry. We have found that 37/68 animals without pedigree were purebred. Our results will be useful to manage a conservation plan of the breed, preserving the characteristic genetic pool and avoiding its extinction.     

毛乌素沙漠南缘绿洲生态区露地厚皮甜瓜栽培适应性研究

在大范围引种观察的基础上,选出较优的10个厚皮甜瓜品种,进一步开展栽培适应性试验,并根据专家评估、消费者需求和种植户意见,建立以农艺性状、商品性状、品质性状为一级指标,产量、含糖量、抗性等15个因素为二级指标,以观察、测定值为三级指标的三级权重赋值体系。对权重赋值的比较分析得出：京玉黄流星、金蜜特、丰雷等3个厚皮甜瓜品种综合性状指标明显优于其他品种,在陕西榆林北部毛乌素沙漠南缘绿洲生态区具有较好的推广价值。     

全液压转向系统方向盘打颤的原因及排除

全液压转向系统的关键部件是由转向阀与计量马达组成的液压转向器,相关部件都是圆周对称部件,外表都是精密加工表面,制造时无法在零件表面刻上安装记号,极易装配错误而造成方向盘发生严重的打颤现象而不能正常工作,甚至会造成人身安全事故。本文通过CAD软件作图,根据其工作原理论述各部件之间的配流装配关系,并通过试车验证,给全液压转向器的正确装配起到明确的指导作用。