湖北白猪导入OMT／PGH基因的整合,表达和遗传

以湖北白猪为实验材料,显微注射OMT/PGH基因(绵羊启动子和猪生长激素的融合基因)于1125枚1～4细胞期的早期胚胎核内,共产仔167头,产仔率14.8%。Dot(斑点杂交)和Southern blot(印迹转膜杂交)检测,29头阳性,阳性率17.9%。通过传代进行转基因的遗传分析。G_0×G_0的配种组合,产仔63头,其中阳性20头,阳性率31.7%;G_0×非转基因猪的组合,产仔66头,其中阳性10头,阳性率15.2%。对11头G_0猪血清用放射免疫法测定的结果,其生长激素的浓度相当于对照组的2.03～6.70倍。16头G_0猪180日龄的生长速度比同窝对照提高11.8%;11头G_1猪比同窝对照提高14.8%,饲料转化率提高10%,瘦肉率有提高的趋势。     

CONTOUR INTERACTION AND VISUAL RESOLUTION: CONTRALATERAL EFFECTS

Detection of the gap in a four-position Landolt C presented to one eye is impaired by critically spaced surrounding bars seen only by the other eye. The intensity and spatial extent of this contralateral contour interaction match those obtained ipsilaterally. These results indicate that the neural site for this loss of visual information is supraretinal.     

林木群体改良沿革及大学本课程教材改革之管见

本文介绍了林木改良由个体改良转变为群体改良的沿革,阐述了林木群体改良的方法、步骤,对我国目前沿用的某些概念作了评论,并对我国高校本课程教材的改革提出了建议。     

ACC解氨酶基因转入青花菜的研究

利用根癌农杆菌介导，以下胚轴为外植体把ACC解氨酶基因转入青花菜栽培品种“上海2号”，获得了转基因再生植株，对转化植株进行GUS检测，初步证明ACC解氨酶基因已转入青花菜中表达，另外，对影响转化频率几个因素，即：农杆菌的悬浮液、共培养的方法、维持培养的时间进行了探讨，由此总结出了青花菜转基因的优化程序，采用优化程序的转化率达到了5.5％。     

UNIT RESPONSES IN THE FROG'S TECTUM TO MOVING AND NONMOVING VISUAL STIMULI

"Movement-detecting" units that respond little or not at all to illumination without movement, respond to change in position under stroboscopic light even when relatively large jumps in the visual field occur during a dark pause between two flashes. The threshold angle and angular velocity are different for different classes of units. They are higher for the periphery of the receptive field and increase with decreasing contrast. An inhibitory effect of a large surrounding of the receptive field coluld be demonstrated in class-2 neurvons.     

基于Visual Prolog及数据库技术构建母猪饲喂专家系统知识库的研究

本文针对母猪饲喂专家系统中关于知识库的构建进行了深入地研究,提出应用Visual Prolog所提供的SQL-BIND接口模块同数据库管理系统（DBMS）进行连接,完成对饲喂知识库的构建及实现方法,从而使得数据充分融合,为后续的饲喂推理奠定良好的基础。     

草原公路线形对驾驶员视觉特性及车速的影响研究

由于草原道路直线长、纵坡小、景观单一的特点,驾驶员在驾驶过程中易引起视觉疲劳并影响到行车安全。本文选取瞳孔直径作为判断指标,对比驾驶员在长直线路段与平面线形组合路段行驶时的视觉特性指标值,分析驾驶员在不同路段驾驶时的瞳孔直径及车速变化情况。得出驾驶员在长直线路段行驶时,瞳孔直径随直线长度增加呈先增大后减小趋势;在平面线形组合路段行驶时,驾驶员的瞳孔直径大小会围绕某一数值水平呈现小幅度的波动。两路段相比,速度趋势图差别较小。