花粉

The pollen morphology of six species in the family Calycanthaceae were observed under light and scanning electron microscope.

在光学显微镜下和扫描电子显微镜下对蜡梅科Calycanthaceae7种花粉形态进行观察，结果表明本科花粉至少有下列3种不同类型：(1)花粉具穴状纹饰，亦道面观呈长方形，中央部位不扩大，如美国蜡梅，或中央部位扩大，如夏蜡梅和西南蜡梅

One hundred and two patients with seasonal asthma allergic to caraway, humulus or chenopodium pollen were divided randomly into 2 groups: observation group and control group and the 2 groups were given purified pollen allergens and crude pollen allergens respectively before the allergic season.

采取随机、对照方法将102例确诊为季节性黄蒿、草、藜草花粉过敏性哮喘患者分为观察组及对照组，应用纯化花粉变应原及粗花粉变应原分别对两组患者进行季节前sit，疗程3 mo。

However takes one kind of precious plants,not actually have the reseach for the chimonanthus praecox in molecular biology.

在分子生物学技术不断取得前进的前提下，人们发现在植物的花药发育和花粉成熟过程中，有大量的基因表达，其中有许多是花药和花粉组织特异性的，目前花药和花粉特异性表达的基因及其调控序列已经成为研究的热点。

At time of 5mm length of alabatrum, the miosis in microsporecyte and the sex differentiation was found, thus in female flowers, pollen mother cell showed a abnormal meiose then the pollen cells gradually disintegrated, final, contabescence had taken, and in male flowers, the stamen normally developed.

在幼蕾长到5mm左右，即花粉母细胞开始减数分裂时，出现花性别的分化，雌花中雄蕊花粉母细胞不能进行正常减数分裂，进而花粉细胞逐步解体而导致雄蕊败育；雄花中雄蕊发育正常至性成熟。

Pollen morphology and exine ultrastructure Pollen exine ultrastructure of five species in Stachyurus and one species of its sister group, Crossosoma californicum, were investigated under transmission electron microcopy for the first time. The pollen morphology of Crossosoma californicum was studied under Scanning Electron Microcopy.

花粉形态学和外壁超微结构在透射电镜下研究了旌节花属5个代表种和1个外类群的花粉外壁超微结构，并在扫描电镜下研究了外类群Crossosomataceae 1个代表种的花粉形态学特征，结合前人的研究，探讨了上述性状的分类学意义。

In addition, since Prinsepia utilis has angulaperturate pollen grains in the early stage of pollen development and shars the same character with two taxa Geissois montana and Cunonia capensis under Cunoniaceae, the pollen morphological data supports the viewpoint that Rosaceae may have a systematic relationship with Cunoniaceae under Saxifragales.

此外，由于Prinsepia utilis的花粉在其发育初期具角萌发孔花粉，与Cunoniaceae下的两个类群Geissois montana和Cunonia capensis具有相同的特征，故花粉形态特征在一定程度上支持Rosaceae可能和虎耳草目中的Cunoniaceae有一定系统学联系的观点。

Using light,transmission and scanning electron microscopy,the development of the polli- nium of Goodyera proceraHooker.was investigated.

兰花的花粉在成熟时一般并不形成单个花粉粒，而是形成花粉块依赖昆虫传播的。

The pollen pictures of FFerula and Heracleum are taken under optical microscope and scan electrical microscope, respectively.

结果表明，阿魏属花粉形状为长球形，而独活属花粉为超长球形；2属花粉外壁均具有网状纹饰，3孔沟。

Pollen material from dried specimens was obtained from the followng herbaria: ANU, ANUB, N, NAS. Pollen of 111 species representing 12 genera was examined in the light microscope and with the scanning electron microscope.

利用光学显微镜和扫描电镜对蓼科12 属111 种的花粉进行了观察和研究，划分出28 个花粉类型，对每个类型做了精确的描述和评价；提供了每个花粉类型的重要鉴别特征。

1Unequal number of univalents with decreased degree of synapsis and lagging chromosomes occurred in meiosis.The abnormal chromosomal behavior correlated with heterogenicity gave rise to unequal allocation of homogenous chromosomes to daughter cells and resulted in the deletion of functional chromosoms,thus led to the occurence of a certion proportion of aborted pollens.(2)The interaction between genetic imbalance and such environmental factors as temperature,etc.,further drew forth physiological and even structrural imbalance,with abnormal development of pollen mother cells and tapetal cells,and consequently resulted in no or very few production of pollens.The difference in the interaction between environment and genotype reflected on the unstability of pollen abortion in different years.

1在减数分裂中有数目不等的联合程度较差的单价体以及落后染色体出现，这种与异质性相关的染色体行为异常，导致同源染色体向子细胞的不均衡分配，造成具功能染色体的缺失，从而引起毛白杨一定比率的败育花粉的产生；(2)遗传上的不平衡与温度等环境因子相互作用，进一步引发毛白杨生理乃至结构上的不平衡，花粉母细胞和绒毡层细胞发育异常，从而造成不产粉或产粉较少；环境与基因型互作的差异性导致了花粉败育的年度不稳定性。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了