花园基础大体积砼冬施作法

文章充分考虑到了施工所在地为山西最寒冷地区的低气温和2.2m厚近1 000m2的筏板混凝土凝固过程的水化热等因素,使工程经过科学的计算和分析,应用综合蓄热法和暖棚法连续作业,依靠现场各个环节出色工作质量,保证了质量、保证了工期,取得了大体积混凝土浇筑的较好效果.     

The accuracy of aminoacylation--ensuring the fidelity of the genetic code

The fidelity of protein biosynthesis rests not only on the proper interaction of the messenger RNA codon with the anticodon of the tRNA, but also on the correct attachment of amino acids to their corresponding (cognate) transfer RNA (tRNA) species. This process is catalyzed by the aminoacyl-tRNA synthetases which discriminate with remarkable selectivity amongst many structurally similar tRNAs. The basis for this highly specific recognition of tRNA by these enzymes (also referred to as 'tRNA identity') is currently being elucidated by genetic, biochemical and biophysical techniques. At least two factors are important in determining the accuracy of aminoacylation: a) 'identity elements' in tRNA denote nucleotides in certain positions crucial for protein interactions determining specificity, and b) the occurrence in vivo of competition between synthetases for a particular tRNA which may have ambiguous identity.     

雀形目25种鸟羽的扫描电镜观察

以隶属于雀形目１０科１８属２５种鸟类的初级飞羽为材料进行扫描电镜观察。结果表明；有钩羽小枝上的腹齿数，纤毛对数，羽小钩数与无钩羽小枝上的腹齿数，背刺数在科间相似性较大，存在着性状特征的交叉与重叠；属种间差异较显著；种下亚种则未发现有显著差异。     

多虫灵浓悬浮剂热贮稳定性及悬浮率测定研究

用高效液相色谱法紫外检测器测定了多虫灵浓悬浮剂的热贮稳定性和悬浮率．外标法测得多虫灵浓悬浮剂（ＦＭＣ公司生产）样品质量浓度为４．８８％，热贮稳定性合格，平均分解率为１．４２％，悬浮率大于９９％．     

距离偏差控制系统的分散次优控制

讨论具有重叠结构的距离偏差控制问题．利用包含原理，提出一种分散LQG控制的设计方法．并给出利用该方法对距离偏差控制进行设计的仿真结果．     

在单片机上实现多事件并行管理的一种方法

提出一种对单片机构成的较复杂系统实现多事件并行管理的基本思想和具体应用的方法．其目的是避免因程序中设有过多的状态查询而造成CPU效率降低，提高系统对事件的实时响应．     

修形齿轮弯曲强度的计算与实验研究

分别用有限元和电阻应变片法对修形齿形和渐开线齿形进行齿根弯曲应力计算与实验应力分析．结果证明在弯曲强度方面修形齿形比标准渐开线齿形更优越．     

环烷酸季戊四醇脂的合成

介绍了用氧化亚锡非酸性催化剂催化合成环烷酸季戊四醇脂的方法，通过讨论醇酸摩尔比、催化剂用量、反应时间、反应温度等因素对该脂化反应的影响，从而确定了适宜的工艺条件．     

Immunocytochemical demonstration of calmodulin in cells secreting by exocytosis

Calmodulin is a regulator of several calcium-dependent cellular processes. It has been suggested that it plays a role in the mechanism of secretion. Employing an indirect immunoperoxidase technique at the light microscope level, this study demonstrates the presence of calmodulin in several exocytotic cells (mast cells, thyroid follicular cells, neurohypophyseal neurosecretory terminals, pancreatic beta-cells and pancreatic acinus cells) in rat and man. The positive staining reaction for calmodulin was granular and at least in the case of rat mast cells it appeared to be associated with the granule membrane.     

Co-localization of GABA receptors and benzodiazepine receptors in the brain shown by monoclonal antibodies

The most abundant inhibitory neurotransmitter in the central nervous system, gamma-aminobutyric acid (GABA), exerts its main effects via a GABAA receptor that gates a chloride channel in the subsynaptic membrane. These receptors can contain a modulatory unit, the benzodiazepine receptor, through which ligands of different chemical classes can increase or decrease GABAA receptor function. We have now visualized a GABAA receptor in mammalian brain using monoclonal antibodies. The protein complex recognized by the antibodies contained high- and low-affinity binding sites for GABA as well as binding sites for benzodiazepines, indicative of a GABAA receptor functionally associated with benzodiazepine receptors. As the pattern of brain immunoreactivity corresponds to the autoradiographical distribution of benzodiazepine binding sites, most benzodiazepine receptors seem to be part of GABAA receptors. Two constituent proteins were identified immunologically. Because the monoclonal antibodies cross-react with human brain, they provide a means for elucidating those CNS disorders which may be linked to a dysfunction of a GABAA receptor.