解放CA10B型汽车功能模型的探讨

本文通过对黑龙江省双丰林业局提供的6台解放CA10B型汽车的使用数据的处理和分析.得出该汽车的单车年周转量及耗油率这两个主要生产参数的影响因素及功能方程.并进一步探讨了该模型对运输企业及木材生产单位的规划、管理、指挥等方面的重要意义.     

蔓荆短枝容器育苗试验初报

本试验探索了蔓荆育苗的新技术,利用蔓荆耐风耐沙耐盐碱的习性,在沿海沙荒、沙滩、风口地段种植,长势良好。蔓荆是沿海防风固沙的一种有效植被,引种蔓荆,是一条经济实用、本小利大的开发利用沙荒沙滩的新路子,为营造沿海防风固沙林开辟了一条行之有效的途径,为改善沿海地区的生态环境创造了条件。     

论刘辰翁对稼轩范型的总结、继承与发展

辛弃疾是南宋词人中的大家 ,其词作对后世影响深远 ,业已成为一种文学范型 ,而宋元之际的刘辰翁对这种范型归纳得最为详尽具体 ,共有四个方面 :1)以诗文为词 ;2 )用经用史 ;3)牵雅颂 ;4)入郑卫。而这四个特点也始终贯彻在辰翁自己的词作中 ,并为其所发展 ,形成了独具面目的须溪风格     

Evaluation of Root Sink Ability of Sweet Potato (Ipomoea batatas Lam.) Cultivars on the Basis of Enzymatic Activity in the Starch Synthesis Pathway

Activities of five enzymes, sucrose synthase (SUS), uridine 5'-diphosphate glucose pyrophosphorylase (UDPGPPase), fructose-1,6 bisphosphatase (FBPase), adenosine 5'diphosphate glucose pyrophosphorylase (ADPGPPase) and starch synthase (STS), in the metabolic pathway of starch synthesis, were compared between two sweet potato ( Ipomoea batatas Lam.) cultivars, Koganesengan (C.V.KOG, a recently released high yield cultivar) and Tsurunasigenji (C.V.TSU, an old, local cultivar with poor yield). The measurements were carried out using the root samples (tuberous, thick and fibrous roots) harvested at the fast tubering stage. Of the five enzymes, SUS, ADPGPPase and STS showed high activities in the tuberous root, particularly in that of C.V.KOG, and a similar trend was observed for activities of these enzymes on a protein basis. The increased activity of the three enzymes is considered to be one of the characteristics in a high yield cultivar, allowing the root to function effectively as a starch synthesis and storage organ.     

Bovine Immunodeficiency Virus in Relation to Embryos Fertilized In Vitro

The association of bovine immunodeficiency virus (BIV) with embryos derived by in vitro fertilization from oocytes of experimentally infected heifers or oocytes/embryos exposed to the virus in vitro was investigated. Using a nested-PCR assay, proviral DNA of BIV was not detected in follicular fluid or in embryos derived from BIV-infected donors. In vitro exposure of oocytes to BIV during maturation or insemination with BIV-infected semen resulted in zona pellucida-intact embryos testing negative for BIV provirus. However, exposure of zona pellucida-free day-7 embryos to the virus resulted in a positive BIV assay for 28% of the batches of embryos, suggesting that the zona pellucida has a role in protecting against BIV infection. The presence of BIV in the IVF system had no apparent effect on the development of bovine embryos to the blastocyst stage.     

棕熊精子体外获能及异种穿卵的超微结构研究

对棕熊精子体外获能前后和异种穿卵的超微结构观察表明,棕熊精子全长77μm,由头、颈和尾3部分组成.头部长7.3μm,宽2.5μm,主要由核、顶体及顶体后区组成;颈部由中心粒和9条纵行分节的节往组成;尾部全长68.2μm,其中中段长13.2μm,线粒体为65～68旋,主段中央为“9 2”的微管结构,其外方被9条致密纤维和纤维鞘包裹.精子获能前群集成簇,运动缓慢;获能后精子呈超激活运动.获能的精子质膜膨胀,顶体外膜囊泡化,引起顶体反应,质膜并未参加囊泡化.顶体反应完成后,仅有顶体内膜包在精子核膜的外面.棕熊精子与仓鼠的卵相互作用,多以赤道段和顶体后区附着于卵膜.     

Comparison of the Value of Pulsed-field Gel Electrophoresis,Random Amplified Polymorphic DNA and Amplified rDNA Restriction Analysis for Subtyping Taylorella equigenitalis

Eight strains of Taylorella equigenitalis were identified by a polymerase chain reaction using a primer pair specific to the 16S rDNA of T equigenitalis. These eight strains were chosen because they had previously been shown to represent eight distinct genotypes by pulsed-field gel electrophoresis analysis after separate digestion of the genomic DNA with ApaI or NotI. The eight strains could be classified into six or seven types by random amplified polymorphic DNA analysis using different kinds of primers. Amplified rDNA restriction analysis after separate digestion with five restriction enzymes, including AluI and MboI, of the 1,500 bp fragments of rDNA amplified by polymerase chain reaction did not discriminate the genomic variations among the eight strains of T equigenitalis. Thus, pulsed-field gel electrophoresis was shown to discriminate these eight organisms better than random amplified polymorphic DNA analysis, while amplified rDNA restriction analysis was found to be unsuitable for subtyping T equigenitalis.     

祁连县本地黄牛全血铁含量的测定

对60头祁连县本地黄牛的全血铁含量进行了测定。结果表明：祁连黄牛全血铁含量为0．319g/L。同时发现公、母黄牛间的全血铁含量无显著差异（P＞0．05），而成年黄牛的全血铁含量极显著地高于犊牛（P＜0．01）。     

黑丝羽乌骨鸡的选育进展与冠型效应

通过对黑丝羽乌骨鸡的复冠父系和单冠母系进行家系选育五个世代，在体重、孵化性能、开产性状及产蛋量方面得到了明显进展，而且可见单冠在这些性状上的正向效应。尤其是产蛋性能上的选育进展非常明显，高峰4个月的总产蛋量增加了1．2倍，母系300d产蛋量达到102枚左右，母系500d产蛋量达到201枚。     

利用体外法研究豆粕型日粮添加烟酸对绵羊瘤胃发酵的影响

本试验培养底物及瘤胃液供体动物日粮为玉米 -豆粕型日粮 ,实验用瘤胃液来自3只安装永久性瘤胃瘘管的绵羊 ,体外实验按不同烟酸添加剂量分为13个试验组 (0、50、150、250、350、400、450、500、600、700、800、900、1000mg/kg) ,每个试验组4个重复。在体外培养24小时后 ,测定培养液中NH3-N、瘤胃细菌N产量、原虫数量、总VFA产量及乙酸、丙酸、丁酸产量和乙酸/丙酸值 ,用以确定在该氮源日粮条件下 ,添加烟酸对瘤胃发酵的影响 ,并对烟酸适宜添加范围进行了研究。实验结果表明 ,在豆粕型日粮来源培养底物中 ,烟酸适宜添加范围为450～600mg/kg。