某些研究暗示，大多数雪晶的核也许是腐朽的植物、细菌或菌类孢子；因此，也许雪大都是由生命触发的。

Some studies hinted that a majority of nuclei in snow crystals may be decayed vegetation, bacteria, or fungi spores; and so snow may be largely life-triggered.

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四分孢子的显著特征是细胞核和高尔基体呈活跃状态。

The characteristics of tetrad was that the nucleus and Golgi bodies being in the active state.

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此外，观察了前期I的簇毛麦染色体形态，统计了四分体和小孢子中小麦和簇毛麦染色质微核频率。

Otherwise, the chromosome morphology involving Haynaldia chromatin was observed at preleptotene I, and the frequencies of chromatin nucleus at tetrad stage and at microspore stage were investigated.

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