SrCl2激活大鼠卵母细胞的效果观察

以Wistar大鼠为动物模型，进行了SrCl2激活卵母细胞的效果观察。结果表明：SrCl2能够激活Wistar大鼠卵母细胞。10mmol／L的SrCl2激活4h，卵母细胞的激活率可以达到89．62％，说明SrCl2对大鼠卵母细胞的激活效果明显。     

基于TM影像的镶黄旗草原沙化治理工程生态效益研究——以2004年封沙育林工程为例

以内蒙古镶黄旗的封沙育林工程为研究区域,以2000年7月和2007年8月的TM影像为数据源,结合地面调查数据,从植被、土壤和风沙活动3个方面12项指标对镶黄旗北部沙化草原封禁治理效果进行了分析.结果表明:工程区的植被盖度、地上生物晕和草层高度分别比自由放牧地提高了253.4%,112.4%.37.2%,植物种数增加,一年生植物比例降低.与工程实施前相比,固定沙地比例增加了124.1%,流动沙地比例减少了80.9%;土壤理化性质也得到了改良,如土壤有机质含量增加了36.2%、细沙比重增加了34.4%,并出现土壤结皮.     

五轴线切割机回转台及控制卡的研究与实现

介绍了五轴金刚石铣刀线切割机的特点和总体设计思想.根据金刚石木工铣刀的加工特点,设计了专用数控分度回转台对加工刀具进行分度.同时还开发了控制回转台分度的运动控制卡,包括硬件和软件模块的实现.通过将做好的控制卡与PC机及回转台连接,并对应用程序进行调试,结果满足分度精度要求.     

The Effects of Resveratrol on the Quality of Frozen Sheep Semen

The effects of resveratrol on the quality of frozen-thawed sheep semen were studied in this study.Semen was collected from six Yunnan semi-fine wool sheep using artificial vagina.The semen was diluted with the Optidyl extender supplemented with resveratrol with a concentration of 0,0.1,1,10,or 20 μmol/L,followed by loading into plastic straws and equilibration at a low temperature.Then,the straws were pre-frozen in liquid nitrogen vapor,followed by storage in liquid nitrogen for 30 days.After thawing for 30 seconds in a 37 ℃ water bath,the parameters including sperm motility,acrosome integrity,membrane integrity,distribution of phosphatidylserine (PS) and ROS were measured.The results showed that the post-thaw sperm total motility,progressive motility and the rate of sperm with curved tail were 76.14%±0.97%,43.56%±0.91% and 43.24%±1.68% in the 10 μmol/L resveratrol group,respectively,which were significantly higher than those in the other groups (P<0.05).However,when the concentration of resveratrol in the freezing extender was 20 μmol/L,the post-thaw total motility,progressive motility and the rate of sperm with curved tail were 21.78%±0.79%,25.23%±1.34% and 4.84%±0.68%,respectively,which were significantly lower than those in the other groups (P<0.05).The acrosome integrity of sperm frozen in the 10 μmol/L resveratrol group was best,which was 50.47%±0.91% and significantly higher than the other treatments (P<0.05).The results of PS distribution showed that the percentage of viable sperm in the 10 μmol/L resveratrol group was 46.43%±2.95%,and significantly higher than that in the 20 μmol/L group (31.14%±3.56%,P<0.05),but there was no significant difference with the other groups (P>0.05).In addition,the PS labeling rate of sperm in the 20 μmol/L resveratrol group (39.82%±3.38%) was significantly higher than those of the other groups (P<0.05).In terms of ROS production,this study demonstrated that the rate of viable sperm (ROS and PI were negative) in the 10 μmol/L resveratrol group (63.57%±0.71%) was significantly higher than that of the other groups (P<0.05),while the rate of viable sperm (32.45%±1.42%) in the 20 μmol/L resveratrol group was significantly lower than those of the other groups (P<0.05).In conclusion,the post-thaw quality of sheep semen could be improved after the addition of resveratrol to the freezing extenders,which might be related to the antioxidant properties of resveratrol.But,the cryoprotective effects of resveratrol dependents on its used doses,and the optimal concentration was 10 μmol/L based on this present study.However,excessively high concentration of resveratrol could aggravate cryodamage on sperm.In addition,the protective effects of resveratrol on sheep sperm still needs to be verified by in vitro fertilization and artificial insemination.     

生物防治技术的应用现状

介绍了生物防治的方法,并对生物防治技术的应用现状及其发展前景进行阐述说明。     

有管取胆对熊体及胆粉产质的不良影响

有管取胆，在胆囊内有常在性异物对胆囊与肝脏的不断刺激、损伤与感染，导致各种并发病的发生，胆囊发生半报废或全报废，而致死性的并发病经常导致熊的死亡，胆囊报废、熊只死亡是产生空白（停产），使产值下降的主要根源，肝脏与胆囊形态结构及功能变化是胆粉质量降低，使熊胆粉声誉和药物价值（药效）减低的主要根源，大剂量抗菌素、化学药品对以熊体的长期使用，会导致胆法中存有殖留物质，而劣性熊胆粉（含有害物质及残留物质）的长期 服用，迟早会导致对人体的危害。     

杂交水稻不结实的原因分析

近几年来，经常有农户反映种植的杂交水稻在大田表现不结实，对产量造成严重影响，也给农户的生产和生活带来影响。通过在大田观察，农户反映的不结实分为两种类型：一是表现为结实率低，其分布呈规律性，在稻田四周结实率较高，稻田中央结实率较低；二是其中部分植株不结实，或在大田分布较均匀，或分布较零乱，或呈条块状分布。农户均认为是种子质量问题造成的。其中确实有一部分是种子质量问题引起的，也有因品种适应性问题造成的，但异常气候、病害以及人为因素也是造成杂交水稻不结实的原因之一。     

新型粮仓温湿度智能化测控系统

阐述了基于高性能单片机的温湿度测量原则，并详细地介绍了粮库测控系统的硬件配置、软件设计和实现的功能。     

六盘水市粮食生产存在的问题及对策

为保证粮食,介绍了六盘水市粮食生产现状,分析了存在的问题,提出了发展粮食的对策与措施。     

班克松更新造林调查分析

本文对班克松进行了树木解析，结果表明，班克松可以做为更新造林树种在抚松县地区大力推广，并且可以建立母树林基地。