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They are often morphologically distinct from A chromosomes, being smallerand more highly heterochromatic in most cases. B chromosomes do not pair with Achromosomes, and they are inherited in a non-Mendelian way, exhibiting meiotic andmitotic instability and nondisjunction. However, B chromosome DNA is quiteidentical to the corresponding sequence on the A chromosome complement. So far afew B chromosome specific DNA sequence have been identified. Specific DNAsequences on B chromosome have been the attractive research area on Bchromosomes.

现已在千余种植物和近三百种动物中被发现。B染色体与物种中正常染色体不同：独立于整倍体基因组之外，减数分裂时不与A染色体发生联会和配对，细胞分裂后期不分离，非孟德尔遗传，富含异染色质，不含对宿主主要性状有影响的基因等。B染色体DNA的分子组成既与A染色体极为相似，具有A染色体DNA分子组成的一般特征：富含重复序列和转座成分，染色体三大功能组件DNA高度同源；又与之相区别，含有B染色体特异的DNA序列，这些DNA序列可以为探讨B染色体的起源和进化提供有价值的信息。

We not only give a new Jordan canonical form J under consimilarity, but also give a practical method finding the Jordan canonical form J, and for any square complex matrix A, we also give a method finging a nonsingular matrix S such that 〓.

不但从理论上给出复矩阵的一个新的若当标准形，而且还给出了相应复矩阵若当标准形的计算方法。进一步地，我们不但给出求一个复矩阵A的合若当标准形J的简单方法，而且还给出一种求相应合相似可逆矩阵S的算法。

In chapter one,the backgrounds and current situation of operator theory in Banach space are introduced and the preliminaries of Banach space are given.In chapter two,we study the existence and uniqueness of fixed point for decreasing strict-set-contraction operator in product space.Under the weak continuous condition,we obtain the existence and uniqueness of fixed point for decreasing operator and we give an application of these results; In chapter three,we get several positive fixed point theorems of decreasing operator and the existence and uniqueness theorems of positive fixed point for operator C=A+B,C=D-A in real Banach space where the order is decided by a normal cone; In chapter four,we obtained some existence and uniqueness theorems of fixed point for some mixed monotone operators in semi-ordered Banach space.

在第一章中，主要介绍了半序Banach空间非线性算子的研究历史背景、现状以及半序Banach空间中的预备知识；在第二章中，我们利用半序方法研究了Banach乘积空间中严格集压缩减算子不动点存在唯一性问题，在弱连续的条件下，得到了不动点的存在唯一性和迭代收敛性，同时，给出了它们的一些应用；在第三章中，我们建立了拟弱连续减算子的正不动点定理，并证明了算子C=A+B，C=D-A的正不动点存在唯一性定理；在第四章中，我们得到了半序Banach空间中混合单调算子的不动点存在性及唯一性定理。

As a result of remarkable effect of new agent A, some countries frequently suffered from bird flu such as Indonesia, Vietnam and Thailand in recent years, have ordered A from Research Group through various channels, as well as many domestic large poultry farms as A has played an important role in prevention and treatment for Avian influenza.

由于A新制剂防治禽流感效果显著，印度尼西亚、越南、泰国等近年来频繁发生禽流感疫情的国家，通过不同渠道从研究课题组订购A，国内的许多大型禽类养殖场也纷纷订购，在防治禽流感方面发挥了重要的作用。

The main results are as following: A A new demonstration to optical theorem is constructed B The scattering amplitude function for small particles, which is more accurate than that in classical RGB, is gained using electrostatics approximation, C Through a δ transform to the high frequent oscillation function, a concise deduction of the EG-type scattering amplitude function has been achieved.

主要结果如下： A给出了光学定理的一个新证法； B利用静场近似，得到了比经典RGB更精确的小粒子散射振幅函数； C通过一个高频振荡函数的δ变换，给出了一种EG散射振幅表达式的简明推导，并做了小角度散射简化，参照ADT，对EG近似又做了相位修正； D定义了一个新的函数—消光函数，并得到了组合散射体消光函数的平均定理。

2Cm bone defect was established in ulna of rabbits, the capacity of different therapeutic measures in bone defect repairment was determined in groups A , B (implanted BMP, TGF -β〓 and carrier) and C . It was found that the appearance of osteoblasts and formation of bone union were earlier and the number of osteoblasts more in group B than in group A. The amino acid analysis revealed that the volume of ossein was significantly higher in group B than in group A at the early stage.

分别用bBMP及载体bBMP、TGF-〓及载体和单纯载体修复兔尺骨1.2cm骨缺损的实验模型来比较三者间的成骨效果，结果表明B组比A组成骨细胞出现早、形成数量多、骨连接形成提前，骨胶原氨基酸分析在骨缺损修复早期胶原形成量B组均高于A组，且B组以形成Ⅰ型胶原为主，C组表现为一纤维形成过程。

A A double of a natural two-or three-level overcall is negative, of a higher bid is for penalty.

a对于二、三阶的自然插叫，加倍为逼叫，阶位再高即为惩罚。

Ust show your lingerie ,no hesitate! It is a overwhelming tride today and yestoday.Early as in 1920s,bigstars in hoolywood had been brave enough to wear their underwear out.In the early 1980,a bold inventional luxurious wind blew,a batch of leading designers began to blur the border between underwear and outerwear.since then ,"inner wear out worn" became a fashion trides.Jean-Paul Caultier and Vivienne Westwood are the leadership of the"inner wear out worn" trides.They made inner wears part of the enticing overclothes smartly.When the big star Madonna wtin uncanny tight corsets and menacing conical bra tops sang "like a Virgin","Material Girl",she added fuel to the fire of the "inner wear out worn" style. On the 1991Gana film festval, the world was marvelled by the Madonna with white silk tuck in blouse and tight longs.

ean Paul Caultier 和Vivienne Westwood是"内衣外穿"风潮的领军人物，他们巧妙地将女性内衣变成极具诱惑性的外衣的一部分，而歌坛巨星Madonna当年穿着复古胸衣马甲高唱"Like a Virgin"、"Material Girl"的惊世骇俗的形象更对内衣外穿的开放式性感着装风格起到了推波助澜的作用。1991年嘎纳影展期间，Madonna又以纯白丝质内衣搭配束腿长裤出席，令世人惊艳叫绝。

Ultimately, vulnerable groups of neurons atrophy and die in a process that may involve excitotoxicity (overstimulation of neurotransmitter receptors on neuronal surface membranes), collapse of calcium homeostasis, inflammation, and depletion of energy and growth factors. A form of apolipoprotein E, apoE4, contributes to the abnormal accumulation of A and tau, but probably also damages mitochondria and the cellular cytoskeleton. A , tau, apoE and -synuclein interact with many other molecules and modulate diverse signalling cascades that regulate neuronal activity and survival.

最后，易感神经元会萎缩直至死亡，原因可能有兴奋性中毒（神经递质对神经元表面受体的过度刺激引起），钙稳态失衡，炎症反应，能量和生长因子的耗尽。apoE4的产生可导致A肽和tau蛋白的异常聚合，可能也损害线粒体和细胞骨架。A肽、tau蛋白、apoE和突触核蛋白可与很多分子反应，也可调节不同信号级联反应，这些级联反应对于维持神经元活动性和生存性意义重大。

This tray has three lava rocks, two A'a and one looks like a section of a rope, pahoehoe.

这盘中有三个熔岩，其中二个是A'a，另一个看起来像绳索切段的是pahoehoe。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。