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- pollen grains in tetrads. 花粉粒为四分体。
- We can see spinous pollen grain in the fruit by microscope. 显微观察可见，果中的刺球状花粉粒最为显著。
- In 1827, upon observing a suspension of pollen grains in water, he discovered BROWNIAN MOTION. 在1827年，在观察水中悬浮的花粉粒时，发现了布朗运动。
- There are many shriveled pollen grains in cultivar Premier that of 80% indicate shriveled type, perhaps that related with their sterility. 这些花粉粒分体表面的明显凹陷，影响到四分体整体的充盈和饱满程度。
- Pollen grains in single flowers of shrub species were found to be almost ten times as many as that of herbs, while the tree species also have higher pollen grain numbers than congeneric shrub species. 对同一属内不同生活型植物的花粉数比较，发现乔木的单花花粉数高于灌木，灌木的单花花粉数明显高于草本。
- Pollen grains prolate, semicircular in polar view. 花粉粒长球形，半圆的在极面观。
- Pollen grain trilobate in polar view. 花粉粒三裂在极面观。
- Pollen grain semiangular in polar view. 花粉粒半具角在极面观。
- Development of pollen grain in peach 桃的花粉发育
- The micronuclei were not observed in tetrad stage . 四分体阶段有微核。
- The pollen grains are spheroidal or subprolate in shape. 花粉为圆球形或近长球形,外壁表面均具网状纹饰。
- Pollen grains subprolate, 3-lobed to circular in polar section. 花粉粒近长圆球形，在极面观为3浅裂到圆形的。
- A microscopic fossil, as of a pollen grain or unicellular organism. 微体化石一种微小的化石，如花粉粒或单细胞有机体的化石
- The microspore mother cells undergo meiosis, and the cytokinesis is simultaneous.The tetrads are tetrahedral.Mature pollen grains are two-celled at the dispersal stage. 小孢子母细胞减数分裂后胞质分裂为同时型，四分体为四面体型排列，成熟的花粉粒为二细胞型。
- The microspores in tetrad stage showed tetrahedron structure. 小孢子四分体为四面体型。
- The innermost wall of a spore or pollen grain. 内壁孢子或花粉粒最深处的壁
- Pollen morphology of Vaccinium ashei was investigated by scanning electron microscopy.Most of pollen grains are tetrahedron with tetrad construction. 摘要扫描电镜下，兔眼越桔花粉为四合体，外形为准四面体，中等大小，表面具不规则皱波状纹饰，并有多处凹陷。
- An attachment on a reaping machine that ties grain in bundles. 捆缚装置收割扎束机上把作物扎成束的附件部分
- Both the pollen grains and the gynoecia are active. 花粉粒和雌蕊都具有活力。
- The pollen grains still to keep tetrahedral form. 小孢子四分体为四面体型。
