2,4-表油菜素内酯和生长素促进大麦胚芽鞘伸长生长的协同作用

以大麦胚芽鞘为材料,研究了生长素吲哚乙酸(indole-3-acetic ac id,IAA)和2,4表油菜素内酯(2,4-ep ibras-sinolide,ep iBR)对胚芽鞘伸长的影响。结果表明:200μmol.L-1IAA和1μmol.L-1ep iBR在黑暗条件下均促进大麦胚芽鞘的伸长生长,而且在该过程中二者存在协同作用,但必须是在IAA之前施用ep iBR或两者共同处理时才能表现;100 mg.L-12,3,5三碘苯甲酸(2,3,5-triiodobenzoic ac id,TIBA)能抑制ep iBR诱导的胚芽鞘伸长生长,暗示IAA的极性运输是ep iBR促进大麦胚芽鞘伸长生长所必需的;内源激素分析表明,ep iBR处理后胚芽鞘内源IAA含量上升,暗示ep iBR对大麦胚芽鞘伸长的促进作用在一定程度上通过调控内源IAA的水平起作用。     

探析高职学生阅读心理,有效开展阅读指导工作

有效开展读者阅读指导工作是摆在高职院校图书馆面前的一项重要任务，文中通过高职学生阅读心理现状分析，探讨了做好高职院校读者阅读指导工作的方法与途径。     

Goldbach猜想的推广

把熟知的正整数集N[1，2，3，…]上的Goldbach猜想推广到整数平方的集合N2[1^2，2^2，3^2，…]上去，得到了一些有趣的结果．     

相关系数的性质的几种证明方法

介绍了相关系数的概念、性质，并对它的性质给出了3种不同的证明方法．     

降雨量对沙棘品种单株产量的影响

通过连续几年对沙棘品种单株产量的测试,结合历年的降雨量及主要月份降雨量,分析降雨量与沙棘品种单株产量的关系.结果表明,沙棘品种的单株产量受品种及降雨量影响效果显著,在适当的降雨量范围内,降雨越多,产量越高,尤其是6、7月份的降雨量,影响较为明显.     

汽车发电机抛负载电压的分析与估算

分析了汽车发电机抛负载电压的形成过程及其与发电机的相电动势、激磁电流和转速之间的关系，汽车发电机抛负载电压包含两个部分，且均由定子绕组本身产生．其一为定子绕组中负载电流突变产生的自感电动势，其特点是持续时间短，危害较小；其二为在激磁磁场作用下定子绕组产生的感应电动势经整流后得到的电压，其特点是电压持续时间长，危害较大，最后推导了发电机磁路在未饱和及饱和时抛负载电压的计算公式，并给出了相应的实例分析。     

Micropropagation of Cryptanthus with leaf explants with attached intercalary meristems excised from greenhouse stock plants

By using the leaves with attached intercalary meristems from greenhouse grown stock plants, five cultivars of Cryptanthus were cultured on modified MS media with 4.5 μM NAA and IBA and 3 μM BA to induce adventitious shoot formation from callus tissue. Contamination was 17–21% for explants taken from stock plants which were sprayed weekly with Agribrom and 27–75% for those taken from stock plants which were not treated. More than 99% true to type plantlets were obtained from non-chimeric plants. Green and albino plantlets were obtained from chimeric plants. The chimeric C. ‘Coster's Favorite’ DeCoster also produced a few chimeric plantlets with intermarginal pink stripes in addition to the green and albino plantlets. Most of the non-chimeric plants took a shorter time to produce plantlets of transplantable size (8–12 mm) than the chimeric ones. Except for albino plantlets, survival rate of plantlets exceeded 95%. A minimum average of 500 rooted plantlets can be obtained in a year from a single well-callused leaf explant. The protocol in this report should speed up the mass production and introduction of desirable new cultivars and hybrids of non-chimeric Cryptanthus.     

关于一类离散时间神经网络模型的稳定性

考虑一类离散时间神经网络模型的稳定性，得到了模型的平衡解是渐近稳定的充分必要条件。     

EVALUATION OF THE VARIABLY OSSIFIED COLLATERAL CARTILAGES OF THE DISTAL PHALANX AND ADJACENT ANATOMIC STRUCTURES IN THE FINNHORSE WITH COMPUTED TOMOGRAPHY AND MAGNETIC RESONANCE IMAGING

Six Finnhorse cadaver forefeet were selected to represent radiographically different types and grades of ossification of the collateral cartilages of the distal phalanx. These cartilages and adjacent tissues were evaluated with computed tomography (CT) and high field magnetic resonance imaging (MRI). In CT the internal structure of the cartilages was consistent, but in MRI some differences were noted. The shape of the collateral cartilages and their ligamentous attachments varied. The border between ossified and non-ossified cartilage appeared distinct, with considerable variation in the extent of the ossified area in regard to the cross-sectional area of the cartilage. Ossification originating from the palmar processes and extending in the proximaVpalmaroproximal direction, without separate centers of ossification, generally appeared smooth and inactive. Palmar ossification followed the irregular shape of the cartilage. Separate centers of ossification had a medullary cavity or were sclerotic. Presence ofamedullary cavity or sclerosis were also found at the base of the cartilages. The incomplete fusion lines between separate centres of ossification and the ossified base of the cartilage varied from congruent and inactive to reactive with marked sclerosis, flared margins and parachondral changes. Incomplete fusion may be clinically significant. Local conformational adaptations of the hoof were also documented with extensive ossification of the collateral cartilage.     

浅谈电子电路实验室的发展趋势

本文通过用Matlab做动态电路实验和传统实验进行比较，明确了虚拟实验仿真系统(EWB)的优越性。从而预言虚拟实验仿真系统将成为电路实验室的一种发展趋势。