细胞遗传学

Objective: To analyse the cytogenetic examinations and their clinical significance for patients with amenorrhea.

目的：分析闭经患者细胞遗传学的检查结果及其临床意义。

Blood samples from 23 Huacaya alpacas ,3 males and 20 females ,were used to study chromosome karyotype ,so as to provide some effective cytogenetics basis for the selectioiymprovement by crossing and disease diagnosis of alpacas ,and genetic mechanisms of sex determination. Peripheral blood lymphocyte culture was used to prepare chromosome. Methods of trypsase-EDTA and BSG (Barium hydroxide / Saline / Giemsa)were used for G-banding and C-banding respectively . The results showed as follows:Firstly , the number of diploid chromosomes was in the alpacas 2n=74,with the karyotype 74, XY and 74, XX for males and females respectively.

为了从选种、杂交改良、疾病诊断以及性别决定的遗传机制等方面为羊驼的繁育与推广提供更为有效的细胞遗传学资料，本试验采用外周血淋巴细胞培养法制备染色体，分析了23只胡阿基亚型羊驼(Huacaya alpaca，雌20只，雄3只)的染色体及其核型，并通过BSG法(Barium hydroxide／Saline／Giemsa，氢氧化钡-盐溶液-吉姆萨，也即Sumner BSG法)与胰酶-EDTA法分别对羊驼的C-分带和G-分带进行分析，结果表明：(1)羊驼二倍体染色体数目为2n=74，雄性羊驼核型为74，XY；雌性羊驼核型为74，XX。

But as a extreme poison, arsenic could induce many cytogenetical changes,such as chromosome loss, breakage and sister chromatid exchange and so on.

但砷剂同时又是一种剧毒物质，可引起染色体断裂、丢失、姊妹染色单体互换等细胞遗传学改变。

Objective: To study the changes of sister chromatid exchange rate in the mutator cell of tumor cell and mutagenized by drug or teratogen.

姐妹染色单体互换(sister chromatid exchange，SCE)检测是细胞遗传学研究领域的一项重要技术。

The analysis and recognition of chromosomes are very important problem in cytogenetics, and it is widely used for diagnosis of genetic disease.

染色体的分析与识别是细胞遗传学的一个重要课题，在遗传病诊断方面有着广泛的实际应用。

Objective To investigate the relationship between infertility and abnormal pregnancy with cytogenetics.

目的 探讨不育和不良孕育史与细胞遗传学的关系。

Chromosome is the carrier of inheritance material, whose structures and functions are the most important content of cytogenetics.

染色体是遗传物质的载体，染色体的结构和功能研究是细胞遗传学中最重要的内容。

It is an important process of cytogenetics to study the structures and functions of chromosome, the main carrier of genetic material DNA.

染色体作为主要的遗传物质DNA载体，研究它的结构和功能是细胞遗传学必不可少的重要环节。

Good chromosome preparation methods are necessary to get good spreading of chromosomes within metaphases for karyotype analysis.

核型分析是细胞遗传学及细胞分类学等相关学科的基本研究方法，要得到高质量的染色体标本，获得可靠的镜检结果，必须要有很好的制片方法。

Karyotype analysis method is a basic technique in cytogenetics,cytotaxonomy and other related subjects.

核型分析是细胞遗传学、染色体工程、基因定位及细胞分类学等学科的基本研究方法[1]。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。