双肌牛的特征及其遗传研究

双肌牛具有屠宰率高，瘦肉率高，优质高价肉比例大，肉质较嫩等优点，倍受消费者欢迎，本文概述了双肌牛的特征，双肌性状的遗传机制，旨在为提高家畜产肉量以及为瘦肉型动物育种工作提供新的科学依据。     

Corner Point Detection Based on Adaptive Line Approximation

The detection of corner points is one of the basic problems of computer vision. Usually the key question of detecting corner points is how to calculate curvature. This paper presents a novel approach of calculating the backward and forward direction of reference point based on the adaptive line approximation. Our line approximation method objects minimize the distance error and the length of approximation widow adaptively changes with the approximation error. Our adaptive method finds a compromise between the length of approximation widow and the calculation precise. The experiments results show, the method can robustly, effectively and precisely locate corner point for curves with apparent corners with little computation.     

Coupling time to silking with plant growth rate in maize

In maize (Zea mays L.), progress towards pistillate flower maturity (silking) is highly dependent upon the environmental conditions around flowering. Under conditions that inhibit plant growth, female flower development is delayed relative to that of the male flowers resulting in an increase in the anthesis–silking interval (ASI). Although variation in ASI has been extensively documented, its relationship to plant growth is not well understood. Therefore, we developed a conceptual basis and experimental approach for quantifying and analyzing the process of female flowering in maize in response to variation in plant growth rate during the flowering period.     

双波长分光光度法测定预混剂中二甲氧苄氨嘧啶含量

利用磺胺喹恶啉和二甲氧苄氨嘧啶（ＤＶＤ）在酸性条件下溶解度不同,降低干扰组分磺胺喹恶啉的比例,再用双波长分光光度法消除其干扰,测定ＤＶＤ含量。浓度Ｃ与ΔＡ的线性关系良好,相关系数ｒ＝０．９９９９;平均回收率为９９．７％;变异系数ＣＶ＝０．５６％。     

双倍盐MEM和传统MEM对BHK-21细胞生长和FMDV增殖的影响

采用双倍盐MEM细胞培养基与传统培养基进行了BHK-21细胞生长和FMDV增殖对比实验，实验结果表明两种培养基无明显差异，双倍盐MEM培养基工艺简单，易于质量控制，是细胞培养基选择的一个方向。     

西吉县谷子全膜双垄沟穴播高产栽培技术

从茬口选择、整地施肥、品种选择、田间管理等方面介绍了西吉县谷子全膜双垄沟穴播高产栽培技术。     

双层连体密集式烤房群的设计与应用研究

通过一种双层10房连体密集式烤房群的设计与应用表明,双层的新型设计,相对原推广的独立的普通密集式烤房群（含同等附属设施）提高土地利用率,可节省用地448.56 m^2,节省比例达40.57%;连体设计相对原推广的独立烤房减少墙体建设285.6 m^2,降低烤房群土建成本9.8%;通过缩小装烟室门、减少观察窗及保温措施的实施、U型地沟排湿结构设计、减少排湿口的数量及面积,减少热量损失,相对普通密集式烤房,能耗降低0.38元/kg,降低19%。密集式烤房的自控程度高,一定程度上减少烘烤用工,降低烘烤风险;同时双层结构,在土地利用方面较大节省了土地,社会效益及环境效益明显。     

二次结实板栗生物学,生态学特性及其经济性状研究

对二次结实板栗在生物学特性、生态学特性及主要经济性状三方面作了初步研究，结果表明：其一年两次着花两次结实，雌雄花比合理，坚果粒大，外观美，耐贮藏，适应性广等，具区别于其它板栗品种的独特特征和优势，是最近选出的一个优良板栗品系。     

甘蓝型与芥菜型油菜种间杂交后代DH系抗旱性评价

为评价和利用种间杂交的抗旱新种质,以24份甘芥(甘蓝型油菜和芥菜型油菜)种间杂交后代DH株系为材料,在全生育期降水量约60mm的情况下,设置正常灌水、苗期干旱胁迫、薹花期干旱胁迫、角果生长期干旱胁迫4个处理,考察产量及与产量相关的4个农艺性状和5个品质性状,应用抗旱指数法、灰色关联度综合分析法结合聚类分析,筛选优异的抗旱种质资源。结果表明,多数甘芥杂交后代材料抗旱性均高于常规甘蓝型品种,其中角果生长期、苗期更显著,共获得10份抗旱性较强的材料,其中2份在全生育期抗旱性均较强。3个时期抗旱性相关分析表明,苗期和薹花期抗旱性显著相关,而角果生长期和苗期、薹花期的相关性不显著。在苗期、薹花期、角果生长期的任一时期发生干旱均能严重影响油菜地上部鲜重、株高、芥酸及油酸含量,同时薹花期发生干旱对产量影响最大,其次为苗期。植株在苗期、薹花期、角果生长期的抗旱性与地上部鲜重呈极显著正相关,薹花期抗旱性与株高呈极显著正相关。