核的

Stiffness, stress and stability check can be easily performed based on finite element calculating results.

该方法可根据有限元计算结果，完成某工况整体和局部的刚度校核、强度校核和稳定性校核，省时省力。

Compared with the corresponding BEAS-2B cells, the shapes of cells and nuclears, the shapes and quantity of cell organs were not significantly changed in the 1st, 2nd, 5th passage BEAS-2BNNK cells. The 10th, 15th passage BEAS-2BNNK cells, which had swelled cell and cell organs and abnormal nuclear and enlarged the nucleoli gradually and increased the quantity of the cell organs and activated their function, showed the characteristic of transformation cells. The 20th, 25th passage BEAS- 2BNNKcells, which had obvious aberration of the cell and nucleoli and had cataclasm of nucleoli and decreased cell organs, showed the characteristic of tumor cells.

与BEAS-2B相比较BEAS-2BNNK第1、2、5代细胞及胞核形态、细胞器形态及数量无明显差别；第10、15代细胞出现肿胀，细胞核逐渐变形，出现核畸形，核仁明显增大，边集，细胞器肿胀，数量明显增多，功能活跃具明显的转化细胞特征；第20、25代细胞及胞核明显畸变，出现明显的核碎裂及多个核仁，细胞器明显减少，具明显的肿瘤细胞特征。

Based on this, a method to estimate kernel parameters using the covariance function of the samples is presented.

证明了对于径向基核函数而言，采用变异函数估计核参数与采用协方差函数估计核参数的一致性。

Three major clusters of numt sequences ( cyt b numt、 ATP8+ATP6 numt and ND4+ tRNA-His+ tRNA-Ser numt) were particularity amplified and sequenced from 10 species within Galliformes and A.galericalata. Comparison numts sequences with homologous mitochondrial partial genes get the different evolutionary characteristics and evolutionary speed compared to mtDNA, then examine the age of insertion of numts using the sequence divergence of numt from the mtDNA. Finally, joined Coturnix japonica、 Coturnix chinensis、 Lophura leucomelana、 Lophura swinhoii and A.albifrons mitochondrial sequences in GenBank, we study the importance function to phylogenetic research of mitochondrial genes and homologous numts.The evolutionary rate of Numts is lower than their authentic sequences of mtDNA, cyt b and ND4 gene evolve faster than homologous numts 2.5 times; ATP8+ATP6 gene evolve faster than numts 18.9 times in Galliformes. Numts show less codon position bias and transition bias under not phylogenetic pressure.

根据2004年3月GenBank登录的红原鸡核基因组草图与其线粒体基因组比对发现红原鸡核基因组中存在3段较长的线粒体假基因，利用PCR方法扩增鸡形目10种鸟类和雁形目中鸳鸯核基因组中3段numt序列：cyt b numt、ATP8及下游ATP6 numt和ND4+tRNA-His+tRNA-Ser numt，测序后分别比较线粒体基因与核同源numt序列的进化特点和进化速率，确定numt序列插入核基因组的时间，以及结合GenBank已登录的日本鹌鹑、蓝胸鹑、黑鹇、蓝鹇和1个雁形目物种——白鹅雁(A.albifrons)相应序列探讨两种同源序列对于鸟类系统进化发育重建的重要作用。

Relationship between DNA content and evolutionary degree DNA contents of bivalves were analyzed statistically with SPSS software at subclass, order, family and species grade respectively. Significant difference was detected between mean values of two subclasses according to the result of T-test. The DNA content of Heterodonta (3.77pg) was distinctly larger than that of Pteriomorphia (3.14pg). It was concluded based on ANOVA that the general trend of DNA content was to change from lower to higher values associated with evolution at higher taxonomical classification, i.e.

核DNA含量与进化地位的关系运用SPSS统计软件，在亚纲、目、科以及种4个分类等级上对双壳贝类的核DNA含量进行了统计分析。T检验结果显示，两亚纲核DNA含量的平均值有明显差异，异齿亚纲的核DNA含量平均值(3.77pg)显著大于翼形亚纲(3.14pg)，该结果表明，核DNA含量在较高的分类等级，即亚纲上表现出随着进化地位的升高显著增大的趋势。

To explore new synthetic methods, we set out a careful investigation of the reaction of benzimidazolium salt with many nucleophilic agents, including the active aromatic compounds and heteratom nucleophilic agents, and found that the quaternary C=N is not so active; when benzimidazolium salt is reacted with big nitrogen nucleophilic agent? phthalimide, it does not give the expected addition product, instead, produces N-alkyl phthalimide through alkyl-transfermation from benzimidazolium salt to phthalimide.

为了开发新的合成方法，研究了苯并咪唑盐与各种亲核试剂（活泼芳环与杂原子亲核试剂）的反应，发现苯并咪唑盐不与活泼芳环及杂原子亲核试剂发生2位加成反应；在与体积较大的位阻型N亲核试剂邻苯二甲酚亚胺反应时，未得到亲核试剂与极化的C＝N的加成产物，而是得到N烷基化的邻苯二甲酰亚胺，进一步研究表明，苯并咪唑盐将1（3）位N上的烷基转移给了邻苯二甲酰亚胺，并讨论了其反应机理和取代基，溶剂效应。

The results indicate that MgB2 phase has smaller critical nucleation energy, higher nucleation rate and shorter incubation time comparing with MgB4 phase as the undercooling degree excesses to a critical value at a low undercooling range. Hence, the MgB2 phase nucleates primarily from the melt and grows up.

结果表明：在小过冷度范围内，当过冷度大于某一临界过冷度时，MgB2相比MgB4相具有更低的形核功、更大的形核率和更短的形核孕育时间，因而MgB2相从与MgB4相的竞争形核中胜出，优先从合金熔体中形核并生长。

The basic idea of nucleosome positioning, the relation between nucleosome positioning and gene expression regulation, experimental and theoretical works on nucleosome positioning were reviewed in this paper.

文章从核小体定位基本概念、核小体定位与基因表达调控的关系、核小体定位实验研究和理论预测工作等几个方面总结了核小体定位的最新研究进展。

The calculation of principal axis box includes the school of the school pit principal axis of the school pit key of the school pit bearings of the school pit stalk of school pit wheel gear of rubbing the clutch to calculate calculate etc.

主轴箱的计算包括摩擦离合器的校核、齿轮的校核、轴的校核、轴承的校核、键的校核、主轴的校核计硕羧。

In addition to the pons positive neurons were also found in cerebellum, most nucleus of thalamus and hypothalamus, and corpus striatum of chicken.

鸡脑阳性神经元除广泛分布于脑干外，小脑、丘脑的多数核团、下丘脑的背侧核、腹侧核和后核以及大脑纹状体等多数脑区也有一定分布。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。