细胞分裂

During secondary growth,the meristematic PHELLOGEN gives rise to parenchyma tissue,the periderm, which forms the secondary cortex.

在次生生长过程中，周皮分生组织的分裂活动所产生薄壁组织细胞，形成栓内层。

It was proved by ultrastructure observations that male plastid excluded during microspore mitosis.

超微结构的研究证明了菜豆雄性质体在小孢子分裂时被排除，质体全部分布在营养细胞中，初形成的生殖细胞已不含质体。

The cells lacked pleomorphism, and no mitotic figures were found.

细胞本身没有明显的差异，没有丝分裂。

OBJECTIVE: To establish a polyploid tumour cell line and study its proliferation, division cod drug sensitivity.

目的：建立多倍体肿瘤细胞，研究其增殖、分裂和药物敏感性。

We found that EBNA2 can compromise mitotic spindle checkpoint and cause polyploidy in HEp-2, U2-OS and BJAB cells.

我们也发现EBNA2可以在HEp-2、U2-OS、BJAB等细胞中干扰有丝分裂纺锤丝检查点，并且造成多套体。

The potassium dichromate at different concentrations could increase the cell mitosis index.

以不同浓度的重铬酸钾为诱变剂，测定玉米根尖细胞的微核率、有丝分裂指数和染色体畸变率。

In that setting, liver stem cells proliferate and can make either of the cell types.

在那样的情况下，肝脏干细胞可以分裂为任细胞类型。

In many gymnosperms the nuclei divide within the pollen grain to produce a small number of cells (2-40 depending on the group )representing the male prothallus.

在许多裸子植物中，细胞核在花粉粒中分裂以产生少量的细胞（2～40个，取决于不同种类），代表雄性原叶体。

These mainly involve the periodic change of ribosome den- sity,the dedifferentiation and redifferentiation of both plastid and mitochondrion during the process of meiosis.

在这个过程中，小抱子母细胞经减数分裂产生大致相同的4个减数抱子，并逐渐发育成雄配子体。

The traits of dedifferentiation and redifferentiation of the explants form H. sampsonii show that the calli the stem and leaf usually form buds at its parietal cells. In the presence of auxin, the parenchyma of the leaf gap at the node is initiated firstly, then, develops blastemata that form buds in a cluster on the node without callus. These show that the various parts ofthe herb differ greatly in cell initiation and organ differentiation.

研究元宝草外植体的脱分化和再分化的特点结果表明，茎段和叶片启动形成愈伤组织，其不定芽通常发生在愈伤组织的周边区，茎节叶腋的叶隙薄壁组织在激素的诱导下启动、分裂，不形成愈伤组织而直接器官分化成芽原基，并在节结处产生一圈成簇的不定芽，表明元宝草不同部位的细胞启动及器官分化调控存在差异。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。