tetrad
英
美
网络 四分体; 四联球菌; 四联体; 四分子; 四分孢子
复数：tetrads
英英释义
noun
- the cardinal number that is the sum of three and one
双语例句
- The sporogenous cell functioned directly as megaspore mother cell. The tetrad of megaspores was linear in arrangement, and every megaspore might be functional.
孢原细胞平周分裂形成一个周缘细胞和一个造孢细胞，造孢细胞直接发育成大孢子母细胞，四分体大孢子呈线形排列，它们均可成为功能大孢子； - 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.
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。 - The pairing and segregating of homologous chromosomes at the frist and second division of meiosis were conformed with PMC meiosis, and finally, the tetrad were formation.
在减数第一和第二次分裂中，同源染色体的配对和分离基本正常，最后形成四分体。 - In tetrad stage, the structures of tapetal cells begin to dissociate.
四分体时期，绒毡层细胞内部结构开始解体。 - Callose exists mainly in transverse walls during dyad, triad and tetrad stages, a little in side walls.
二分体、三分体、四分体时期，胼胝质荧光主要存在于大孢子之间的横壁上，侧壁内胼胝质荧光较弱。 - Microspore mother cells meiosis was conformed to simultaneous type with mostly tetrahedral and decussate tetrad.
小孢子母细胞减数分裂属于同时型，小孢子在四分体中的排列方式多数为四面体形，少数为十字交叉形。 - The merit of viewing the four as a tetrad rather than selecting only three to form a triangle is that it gives greater prominence to quality.
把这四个变量看成是四元的而不是选出三个组合成三角形，它的优点在于：它给质量上带来了很多显著的帮助。 - First, we construct the symmetrized null tetrad from which the spin coefficients and Dirac equation are derived.
首先，构造对称化零标架，计算旋系数，导出Dirac方程，并对其进行化简。 - In the course of the embryonic development, after the microspore tetrad is formed, although some forms of the microspore were under developed, and lose of protoplasm, but some have formed normal microspore.
在胚胎发育过程中，小孢子四分体形成后，虽然出现有些小孢子形状不规则，原生质少或无等现象，但也有发育正常的花粉粒。 - At both tetrad and pollen mother cell stages, the amount of polysaccharides in pollen cells of male sterility line was slightly higher than that of its maintainer lines.
在花粉母细胞和四分体时期，不育系细胞中多糖物质的含量稍高于保持系细胞中的含量，但它们之间差异不显著。