金属硫蛋白对应激猪血清中某些酶活性的影响

金属硫蛋白是一类低分子量、富含半胱氨酸的金属结合蛋白。它与应激及应激性疾病有关。本文试探讨金属硫蛋白对应激猪血清谷丙转氨酶、谷草转氨酶、乳酸脱氢酶、超氧化物歧化酶活性的影响，以便为金属硫蛋白在畜牧业生产中的应用提供一定的理论依据。     

中国荷斯坦种公牛培育刍议

本文综述了当前我国选育荷斯坦种公牛的种质来源，对各种种公牛选育方法的优缺点进行了评价，并分析了制约我国自己培育优秀种公牛的因素，最后就如何加强我国荷斯坦优秀种公牛的选育提出了建议。     

刈割强度对伊犁绢蒿叶功能性状及构件的影响

以新疆荒漠草地典型植物种伊犁绢蒿(Seriphidiumt ransiliense)为研究对象,通过生长季内多次采样方法(每30d采样一次),比较不同刈割强度比叶面积、叶干物质含量的变化及相互关系,以及对茎叶比和地下生物量变化的影响,以揭示伊犁绢蒿叶片对刈割胁迫的最佳响应机制,为建立模型估算单位面积生物生产力提供理论依据,并试图得出一个既可合理利用又利于种群更新的刈割强度阈值。结果表明,比叶面积和叶干物质含量在刈割后初期各刈割强度间存在显著性差异(P<0.05),个别达极显著差异(P<0.01),恢复一段时间后,各刈割强度间差异不显著;适度的刈割强度可增大伊犁绢蒿SLA与LDMC之间的相关性;除对照(CK)外,C2处理处于较高水平,说明适度刈割有助于伊犁绢蒿生殖枝的产生及生长,C2这种刈割强度在实际生产利用上占绝对优势;伊犁绢蒿根系干重随着刈割强度增大而增加。     

我国兔毛品质研究状况的探讨

通过对兔毛纤维类型、物理特性和结构特征的分析,并与相关动物纤维作比较,探讨了兔毛在纺织上的应用价值。     

鸭肠炎病毒UL51和UL52基因的克隆及序列分析

利用靶基因步行 PCR 方法扩增得到鸭肠炎病毒(DEV Clone-03)5352 bp 基因片段,并进行克隆和测序.序列分析发现,该片段包含2个ORF.Blast 分析表明,这2个ORF分别与单纯疱疹病毒1型(HSV-1)UL51 和UL52 基因同源,命名为DEV Clone-03 UL51和UL52,分别编码252和1124个氨基酸.DEV Clone-03 UL51和UL52基因排列方式与HSV-1同源基因相一致,为"头对头"的转录方向,两个ORF间有236 bp 间隔序列.用DNAStar(Megalign)软件分别对这2个ORF和11株α-疱疹病毒参考毒株进行分析,发现DEV Clone-03 UL51 与HSV-1的氨基酸序列有相对较高同源性,DEV Clone-03 UL52与EHV-4 同源性相对较高.并且DEV Clone-03UL51基因在α-疱疹病毒中比较保守.与HSV-1 UL52 蛋白相似,DEV Clone-03 UL52蛋白C末端存在锌指结构.系统发育分析表明,DEV Clone-03与α疱疹病毒亚科成员的关系比较保守,与Mardivims属的成员具有较近的亲缘关系.     

Effect of Human Menopausal Gonadotropin,17β-estradiol and Epidermal Growth Factor on the Quality of in vitro Maturation Bovine Oocytes

For optimizing in vitro maturation system of bovine oocytes,we firstly examined the influence of four different hormonal regimes(FSH+LH,HMG,FSH+LH+E₂ and HMG+E₂) on oocyte maturation rates.Then we studied the effects of epidermal growth factor (EGF) in the above defined medium on bovine oocyte maturation,in vitro development and quality of parthenogenetic embryos.The cell apoptotic index of parthenogenetic blastocysts was detected by TUNEL.No significant difference was observed in maturation rates in four groups supplemented with different hormones.However,human menopausal gonadotropin (HMG) provided steady maturation results in replicates.Maturation of oocytes was promoted by supplementation with 17β-estradiol (E₂).Combination of HMG and E₂ gave rise to steady and efficient mature results.The presence of EGF at 30 ng/mL concentration significantly increased maturation rate and blastocyst rate and reduced apoptotic cells in parthenogenetic blastocysts.Therefore,the optimal oocyte maturation solution could be supplemented with 0.075 IU/mL HMG,1 μg/mL E₂ and 30 ng/mL EGF.     

Comparative Study on Carcass Traits and Meat Quality of Different Month Old of Xinjiang Brown Cattle Steers

In this research,12 heads of 28 to 30 months (low months age group) and 8 heads of 32 to 34 months (high months age group) Xinjiang Brown cattle steers which fed in the same mode of nutrition were chose for the slaughter test,in which the carcass traits,nutrient composition and some edible quality index were measured and comparative analyzed,a research which through comparative analysis the carcass traits and meat quality of nutritional components of different months of Xinjiang Brown cattle steers was carried out.The results indicated that the marbling,carcass grade,fat,meat color of high months age group were better than that of low months age group,the traits of the low months age group on fat color,moisture,protein,cooking loss and shear force value were better than that of high months age group,and there were significant difference on the traits of fat and meat color L^* between the two groups (P<0.05),while the differences of other traits between them were not significant (P>0.05);As high-grade beef,in addition to the traits of meat color and pH value of the chunk roll,tenderloin and striploin,each site of the meat traits on the fat,protein,moisture,cooking loss,shear force value indicators were all better than other parts,and showed the best of nutritional value and edible quality.28 to 34 months of Xinjiang Brown cattle steers could produce high-grade beef,the meat could be used as the raw materials of steak and boiled beef.     

景颇族传统民族图案在园林中的应用探讨

少数民族的传统图案是一笔独特的文化财富。本文通过对景颇族传统图案的产生、类型和象征分析,对部分典型图案的图示和阐述,探讨了景颇族民族传统图案在园林中的应用形式和发展前景,为设计具有少数民族特色的园林提供思路和方法。     

白龙江上游主要灌丛土壤入渗性能分异性

对白龙江上游主要5种灌丛类型进行土壤物理性质和入渗性能试验。结果表明:不同灌丛类型的土壤物理性质和入渗性能都存在着较大的差异,杜鹃(Rhododendron simsii)灌丛土壤蓄水能力和入渗性能均大于其它灌丛类型,臭樱(Maddenia hypoleuca)灌丛土壤蓄水能力和入渗性能最差;不同灌丛类型土壤的初渗率在3.68~44.13 mL/min,稳渗率在1.05~4.71 mL/min,总体上是杜鹃灌丛荚蒾(Viburnum dilatatum)灌丛箭竹(Fargesia spathacea)灌丛中华柳(Salix cathayana)灌丛臭樱灌丛;土壤初渗率和稳渗率与土壤自然含水量、入渗总量和孔隙度呈及显著正相关,和土壤密度呈及显著负相关。     

天水106份冬小麦品种（系）Yr18基因和1BL/1RS易位的分子检测

选用与Yr18基因和1BL/1RS易位系紧密连锁的SCAR和STS标记,对天水106份供试冬小麦育成品种(系)Yr18基因、1BL/1RS易位系的分布情况进行分子检测。结果表明,106份材料中,有2份材料检测到Yr18基因,有55份材料检测到1BL/1RS易位系,分别占被检测材料的1.89%、51.89%。对目前流行条锈菌小种有良好抗性且表现慢锈性的Yr18基因在甘肃天水小麦育种中的利用率较低,而1BL/1RS易位系的利用率仍然较高。品系15-16H307和07-144-2-1-1-1同时检测到1BL/1RS易位系和Yr18基因,建议在甘肃天水小麦抗条锈病育种中合理应用。