花粉

Studies on pollen morphology of Pulsatilla Mill.

标题 白头翁的花粉形态研究。

Leaves spirally arranged, spreading radially, or directed forward on upper side of branchlets and spreading on lower side, each inserted on a petiolelike pulvinus, linear, straight or curved, quadrangular, broadly rhombic, or flattened in cross section, stomatal lines adaxial or on each surface, vascular bundle 1, resin canals 2, sometimes small and discontinuous. Pollen cones solitary in leaf axils, rarely terminal, ellipsoid or cylindric; pollen 2-saccate.

螺旋状排列，平展的叶光线，或在小枝和平展在下部边的上面边上向前指导，每着生于一叶柄状叶枕，线形，直或弯曲，四棱，宽棱形，或扁平的在横断面上，在叶腋，很少顶生，椭圆形的或圆筒状里的雄球花单生；花粉2囊。

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。

Results showed that the PMC meiosis of autotetraploid was similar to the diploid except some particularities. In metaphase Ⅰ, multivalent, quadrivalent, trivalent, bivalent and univalent were observed and some of the chromosomes were found not to rank on the metaphase plate and so did in metaphase Ⅱ cells. In anaphase Ⅰ and anaphase Ⅱ cells, there were lagging chromosomes, chromosome bridge and fragment. During anaphase Ⅱ and telophase Ⅱ, chromosome segregation was not synchronous or equal. At tetrad stage, dyad, triad, tetrad with micronucleus and polyad appeared.

结果表明，同源四倍体花粉母细胞减数分裂过程与二倍体相比，中期Ⅰ染色体构型复杂，有多价体、四价体、三价体、二价体和单价体；中期Ⅰ及中期Ⅱ有部分染色体没有排列在赤道板上；后期Ⅰ及后期Ⅱ出现落后染色体、染色体桥及断片；后期Ⅱ和末期Ⅱ有染色体不同步分离及不等分裂的现象；四分体时期还出现二分体、三分体、含微核的异常四分体及多分体。

I checked some of the information was that bee pollen is a fine, public bee, queen bee their food.

我查了一些资料有人说花粉是幼蜂、公蜂、蜂王们的粮食。

Objective To study the clinical manifestations, allergic characters and management of ragweed pollenosis in the Qingdao area.

目的 探讨青岛地区豚草花粉症的临床表现、变态反应特点及与新的变应性鼻炎分类方法的关系和防治措施。

Pollen of the ragweed plant is a common allergen.

豚草属植物的花粉是常见的过敏原。

An improved procedure of bronchialprovocation test with ragweed pollen ex-tract is described.

本文叙述了支气管激发试验的改良方法，用豕草花粉提取液作为过敏原。

The intra-specific traits are correspondingly steady.18.elevation has significant effect on length of stylar ramification,pollen number(P-values are 0.003,0.005 respectively) among species when influence ofabove-ground-biomass was removed.

增长的花柱分枝能够弥补昆虫稀少和花粉数降低所带来的传粉限制，它对高山地区风毛菊属植物的有性繁殖成功有着重要的适应意义。

Because of this crucial function in the plant's reproductive cycle, pollen is the objectof biochemical and molecular biological research.

正是由于花粉的这一重要作用，使其成为生物化学和分子生物学领域研究基本规律性问题的首选对象。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。