两极分布

奥陶纪生物的两极分布及其与生物地理的关系

The bipolar distribution and biogeography of the Ordovician faunas

认为古生物地理大区的混生区是这些两极分布的凉水型分子的起源地，即混生区起源。

Place of origin for these genera which belong to bipolar distribution may be the mixed livingarea ( or zone ) between two realms .

当细胞进入胞质分裂期时，除纺锤体两极分布有CaM外，在细胞中央皮质下也出现CaM的富集；

After the cell entered cytokinesis , in addition of the spindle poles distributed CaM , another fraction of CaM appeared under the equatorial cortex ;

末期n四个子核呈两极分布，每极两核，或呈三极分布，其中一极两核，另两极单核；

The nuclei at telophase II were arranged to two poles , each pole contained two nuclei , or to three poles , one of which contained two nuclei , the other two contained one nucleus respectively ;