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Based on the biology model, leek is put in the normal paint or water-based environment. Since the ratio of microkernel is directly proportional to damage, the pollution can be assessed through the permillage of microkernel.

通过实验建立起生物学模型,将处于减数分裂时期的韭菜花放入涂有油漆和水性漆的环境中,其花粉细胞常发生突变,而在正常环境中的韭菜花的花粉细胞突变较少。

Puna Chicory, leymus multicaulis and Psathyrostachysjuncea.For the materials used in this article were some old seeds which had been stored for 3-7 years, we found a lot of abnormal mitotic and meiotic cells, such as chromosome bridge. chromosome laggard, micronucleus, multipolar division and so on. Moreover, we also found the wheat"s multi-anther, double germinate-hole"s microspore and collected the photos of every period of meiosis. mitosis.

因为用于细胞学检测的小麦材料是搁置多年的陈旧种子,所以在检测染色体数目时,发现大量异常分裂现象,包括染色体桥、染色体落后、微核、多极分裂等;实验过程中还发现小麦多花药现象和花粉粒具双萌发孔的现象;同时在显微观察同时还注意搜集了细胞有丝分裂、减数分裂各个时期的分裂相图片。

Chromosome pairing behavior in meiosis of the hybrid F1 was carried out. Results showed that in an average , 1.25 rod bivalents were observed in one PMC, meiotic configuration was 2n=14=11.49Ⅰ+1.25Ⅱ(Xta=1.25) and most of PMCs possessed 1~5 bivalens, indicating that the relatively high homeology was detected between the D genome of Ae.tauschii and the V genome of D.villosum. The morphological differences between F1 hybrids and their parents were significant. F1 plants were highly self-sterile, but partially self-fertile after treated by chromosome doubling technique.

对杂种F1花粉母细胞减数分裂中期Ⅰ染色体配对行为进行观察发现,"节节麦×簇毛麦"杂种F1平均每PMC有1.25个棒状二价体,染色体的平均构型为2n=14=11.49Ⅰ+1.25Ⅱ(Xta=1.25),大部分被观察的细胞出现1~5个二价体,表明节节麦D染色体与簇毛麦V染色体间具有相对较高的部分同源配对, D和V染色体之间存在一定的部分同源性。F1植株高度自交不育,经染色体加倍处理后能够自交结实。

Previous studies have demonstrated that primary spermatocyte can undergo meiotic divisions in MI oocytes and the resulting embryos can develop to term. However, the success rate is very poor.

已经证明初级精母细胞在显微融入MI卵母细胞后可以完成减数分裂并且产生的胚胎可以发育到期,只是发育率还非常低,作为一种形式的核移植,细胞周期的同步化处理对于胚胎的发育具有重要意义。

2PKC inhibitor—staurosporine or sphingosine could also inhibitthe stimulatory effect of FSH(100IU/L);while PKC activator,phorbol myristate acetate,at the concentration of 10-8-10-5M had a dual effect on the meiotic resumption of pig CEO.

2PKC的抑制剂——Staurosporine(10-9-10-6M)或Sphingosine(10-8-10-5M)也能够显著抑制FSH(100IU/L)的刺激作用;然而PKC的激活剂——PMA(10-8-10-5M)对猪CEO减数分裂的恢复具有双相作用。

Based on principle of pollen abortion, utilizing tapetum of anther cell, mitochondria of tapetum, callose well, process of cell meiosis during formation process of pollen, we adopt genetic transformation to create plant male sterility, such as, exogenous cytotoxin gene, chaperones, anti-sense RNA, degradation of callose ahead of time, disturbing information intercommunion between mitochondria and nucleolus and affected development of pollen sporule by bacteria.

根据花粉败育的原理,利用花药细胞绒毡层、绒毡层线粒体、胼胝质壁、细胞减数分裂过程等花粉形成过程中的不同环节,采取外源细胞毒素基因、分子伴侣、反义RNA技术、提早降解胼胝质、扰乱线粒体与细胞核之间的信息交流和细菌影响花粉小孢子发育等策略,使花粉不能正常形成,从而产生不育花粉,达到产生雄性不育的目的。

The first stage of meiosis, constituted by a series of events that include DNA replication, the synapsis of homologous chromosomes, crossing over, the formation of chiasmata, and contraction of the chromosomes.

前期阶减数分裂的第一个阶段,由一系列的事件组成,包括脱氧核糖核酸的复制,同种染色体结合、交叉,染色体形成以及染色体的收缩一套,一系列

The first stage of meiosis ,constituted by a series of events that include DNA replication,the synapsis of homologous chromosomes,crossing over,the formation of chiasmata,and contraction of the chromosomes.

前期阶减数分裂的第一个阶段,由一系列的事件组成,包括脱氧核糖核酸的复制,同种染色体结合、交叉,染色体形成以及染色体的收缩

Meiosis is the most important reproduce and favoured by organisms. The key events of meiosis identified are pairing, synapsis, genetic recombination, segregation.

李丽减数分裂是生物体重要的有性生殖方式,它提供来自母本和父本的基因信息,产生具有生物多样性的子代,使其能够适应环境的变化而不断进化。

Monosomic 3, monosomic 5, monosomic 10, trisomic 4 and trisomic 5 as experiment materials, their meiosis behavior of pollen mother cell, pollen characteristics, physiological and biochemical characteristics of anther, section observation of pollen development and the structure of embryo sac were studied, and the effects on the seed set and transmission rate were analyzed.

本文以大白菜同源四倍体小孢子培养产生的且已鉴定为3号单体、5号单体、10号单体、4号初级三体、5号初级三体的非整倍体株系及二倍体株系等为试材,对各材料的结籽率、雄配子传递率进行了统计,并对花粉母细胞减数分裂行为、花粉特性、花粉发育和胚囊结构以及花药生理生化特性等方面进行了观察研究,进而分析了其对大白菜单体n-1雄配子和三体n+1雄配子传递率的影响。

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此刻阴唇已经几乎完全的缝在一起了,排除多余淤血体液的管子和Foley导管从顶端冒出来。

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