A healthy egg carries 46 chromosomes - 23 pairs - but before it can be fertilised it needs to ditch 23 of these, which it packages into a structure called a polar body.
一个健康的受精卵有46个染色体(23对)，但在它能分化之前，它必须先分为23个一组，形成极体。
2
Object To explore the regularity of microwave extraction (me) on Chinese medicines in different morphological structure and different polar compositions.
目的探索微波萃取(ME)对不同形态结构中药及含不同极性成分中药的提取规律。
3
Tourmaline with polar asymmetry structure has its particular electric characteristics-spontaneous polar electricity, which show as electrostatic electric field existing around mineral particles.