小粒

At mononucleus microspore stage,cytoplasm were thick and organella,such as mitochondria,endoplasmic reticulum were abundant.At two\|nucleus and three\|nucleus stage,there were a lot of starch grains.

结果表明，85 EA、89 AR、TA 与恢复系杂交F1 代小孢子发育表现出明显的可育特征：在单核期，细胞质浓，细胞器丰富，线粒体、内质网等十分发达，二核及三核期淀粉粒数量多。

The results showed that catalyst prepared at 160℃ and pH=1 has the best photocatalytic activity, which is related to its small size and large surface area.

结果表明，在160℃、pH=1条件下制备的催化剂的活性最佳，这与其具有小的粒径、大的比表面积等因素有关。

It was reported that the pHZ1392 isolated from a genomic cosmid library of 10-22 might contain the complete gene cluster for 5102-Ⅱ bio-synthesis, which can inhibit some pathogenetic fungi, such as Cochliobolus heterostrophus and Piricularia oryzae, etc.

在过去的研究中曾报道10-22基因文库中的一个粘粒-pHZ1392可能含有完整的5102-Ⅱ抗生素合成基因簇，如果以pHZ1392转化变铅青链霉菌ZX64，可以使该宿主菌获得对玉米小斑病菌的抗性。

The calculation results shows that ,(1) when the rotor rotates at the working speed, a local regurgitant whirlpool that is rightabout to the rotor"s rotating direction appears in the classifying region, which makes the separated granules come back to the outside of the classification district and influences the classification efficiency of the turbine classifier;(2) in the condition of a low rotating speed of turbo rotor, ultrafine particles can follow the gas phase by and large, but when the rotating speed increases, a phenomenon of velocity slippage between two phases appears evidently;(3) A operating parameter, air flow rate is so important that can directly influence the stability of flow field in classifying chamber, the bigger the air flowrate is , the steadier the flow field is;(4) Compared with straight blades, the new shape of blades with backward crooked elbow are helpful to improve the stability of flow field and form whole stream easily, also beneficial to advance the classification accuracy and classification efficiency;(5) The motion trace of particles are very complicated when the turbo rotor rotates at a high speed, the constant bounce of the particles appear between the blades and the coarse particles are even bounce back from the inlet, only the finer can pass through the classification area from the oulet;(6) Along with the increase of the rotor"s rotating speed, radiah axial and tangential velocity all begain to fluctuate repetitively like sine-wave, the smaller the particles are, the more violently they fluctuates.

数值模拟结果表明，(1)在涡轮达到工作转速时，在分级区域形成了一个与涡轮旋转方向相反的局部回流涡，它使得分离出来的细粒重又被带回分级轮外边缘，从而严重影响分级机的分级效率；(2)粉尘粒子在涡轮低速运动情况下，基本上能跟随气体运动，但随着转速加大，两相之间出现了明显的速度滑移现象；(3)分级机工作时的风量也是一个比较重要的操作参数，它可以直接影响到分级机内腔流场的稳定性，风量越大，流场越稳定；(4)同直叶片形状相比较，带后弯导板的叶片，有利于改善流场的稳定性，流场容易形成整体流，对提高分级效率和分级精度都非常有利；(5)粒子轨迹线在涡轮转速较高时十分复杂，有的出现了反复的弹跳现象，大颗粒不能通过分级区域而从进口返流了，只有细小的颗粒才从出口处流出；(6)涡轮转速加大时，粒子的径向、轴向和切向速率出现了明显的类似于正弦波的脉动现象，颗粒越小，脉动程度越为剧烈。

Then, nanoparticles were prepared with a reprecipitation method and tested. We found that the nanoparticles with small size and lower poly-dispersion index can be prepared though shortening deposited time, decreasing concentration, increasing deposited temperature and adding surfactant.

利用二次沉淀法制备出三种有机分子不同粒径的纳米微粒，通过改变时间、浓度、温度、表面活性剂等实验条件分析这些因素对纳米微粒粒度的影响，发现缩短放置时间、减少有机稀溶液的注入量、升高放置温度、加入表面活性剂可以得到小粒度，低分散度的纳米微粒。

When pH value was 9,the morphology of particles converted from rhombohedral to spherical shape.

在上述条件下得到的产物为粒径小且分布均匀的单晶粒子。

Study on the seed setting and kernel characters of F1 derived from the crosses between Triticum aestivum and its related species such as Triticum durum, Triticale and Secale cereale was carried out by the means of artificial emasculation and pollination.

采用人工去雄和授粉的方法研究了普通小麦、硬粒小麦、小黑麦、黑麦间不同杂交组合的结实率及其F1籽粒的形态差异。

Objective: The prospective investigation of lymph secluding metastasis of T2-4 N0-phase in head-neck squamous cell carcinoma of small sample, and made prepare for constructiving plasmids.

目的：通过检测T2~4 N0头颈部鳞状细胞癌培养的肿瘤细胞及新鲜活检组织中VEGF-A、C及VEGFR-3的表达情况及构建质粒，探讨是否可以通过组织小样本前瞻性研究了解T2~4 N0患者淋巴管受累及局部淋巴转移情况并为制备VEGFR-3抗体作好准备。

Under low temperature condition, fertility restoring, anther developing normally, the tetrads formed after archesporical cell, sporogenous cells and microspore mother cell. Subsequently, microspores were free from the tetrad of fertile anther and formed mature pollen grains, tapetumof the fertile anthers began to disintegrate and disappear at last.

在低温处理条件下，育性恢复，花药发育正常，经过孢原细胞期、造孢细胞期、花粉母细胞期后，可以顺利形成四分体，可育花药的四分体可以释放出小孢子并发育为成熟的花粉粒，同时绒毡层细胞开始解体，最后消失。

When we plant a rose seed in the earth,we notice it is small,but we do not criticize it as "rootless and stemless."

一粒小的玫瑰花籽被植入土壤时，我们并不因为它&无根无茎&而加以批评。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。