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1·To investigate the incidence of sister chromatid exchange (SCE) and its influencing factors.

探讨影响姐妹染色单体互换(SCE)频率的因素。

2·Methods: the sister chromatid exchange (SCE) test in mice spermatogonia was used in the study.

方法：采用小鼠精原细胞姐妹染色单体交换实验。

3·Methods:Sister chromatid exchange(SCE) was sued in human lymphocytes and plant root tip cells.

方法：蚕豆、大麦和人外周淋巴细胞姐妹染色单体交换（SCE）。

4·Methods:Sister-chromatid exchange (SCE) was used in human lymphocytes and plant root tip cells.

方法：人外周血淋巴细胞和植物根尖细胞SCE。

5·Results showed that DCAP was clastogen and the aberrations were mainly chromatid breaks and exchanges.

结果表明：DCAP是一种染色体损伤剂，诱发的畸变主要为染色单体断裂和交换；

6·The types of the structural chromosome aberration mainly were chromatid gap, chromatid break and deletion.

结构畸变类型主要是单体裂隙、单体断裂和缺失。

7·At anaphase the dicentric chromatid will form a bridge and the acentric a fragment, both of which can be scored.

在后期双著绿点染色体将形成一个桥，无著绿点染色体单体形成一断片，此两者均可记录下来。

8·Chromosomal stability were detected in 23 children with malignancy by the technique of sister chromatid exchange (SCE).

用姊妹染色单体互换(SCE)技术检测23例恶性肿瘤患儿的染色体稳定性。

9·The mean frequencies of chromosome aberration (CA), sister chromatid exchange (SCE), and micronucleus(MN) were analysed.

静脉采血检测染色体畸变、姊妹染色单体交换（ SCE）、细胞微核的发生率。

10·The central axial area of each chromatid is a low electronic density region or chromatin free compartment, in which there are lots of RNP.

在染色体横切面中，可见染色体中央有一低电子密度的无染色质区，该区内有大量RNP物质。

染色单体

1·Chromosomal stability were detected in 23 children with malignancy by the technique of sister chromatid exchange (SCE).

用姊妹染色单体互换(SCE)技术检测23例恶性肿瘤患儿的染色体稳定性。

2·We applied the sister chromatid exchange (SCE) technique to pregnant women with antibodies against cytomegalovirus (CMV) positive, to detect the lesion and repair of DNA in the lymphocytes.

采用孕妇外周血淋巴细胞姐妹染色单体交换（SCE）技术，检测巨细胞病毒（CMV）抗体阳性孕妇淋巴细胞DNA损伤和修复。

3·The mean frequencies of chromosome aberration (CA), sister chromatid exchange (SCE), and micronucleus(MN) were analysed.

静脉采血检测染色体畸变、姊妹染色单体交换（ SCE）、细胞微核的发生率。

4·Several studies have shown that SO2 and its derivatives could induce chromosomal aberrations, sister chromatid exchanges and micronuclei in human blood lymphocyte, bone marrow cell in mice and CHL.

研究发现，SO_2及其衍生物可引起人外周血淋巴细胞、小鼠骨髓细胞、中国仓鼠肺成纤维细胞等哺乳动物细胞的染色体畸变、姊妹染色单体交换及微核的形成。

5·Methods: the sister chromatid exchange (SCE) test in mice spermatogonia was used in the study.

方法：采用小鼠精原细胞姐妹染色单体交换实验。

(1)sister chromatid姊妹染色半体