Researchers have known since the nineteen thirties that the actively growing tip of a plant release s a hormone called auxin.
从上世纪30年代起，科学家已经得知植株活跃的生长点释放一种叫做生长素的荷尔蒙。
The microstructure and ultrastructure of antler growing tip in sika deer were observed.
利用光镜和透射电镜对梅花鹿鹿茸角生长顶端的组织结构进行了观察。
The results showed that the growing tip of sika deer antlers consisted of skin, mesenchyme, precartilage, transition zone and cartilage.
结果显示，梅花鹿鹿茸角生长顶端分皮肤层、间充质层、前成软骨层、过渡层和软骨层。
It displayed the sum-temperature effect in theperiod from the emergence of seedling to the elongation of growing tip andthe low temperature effect in the period from the elongation of growing tipto the appearance of spikelet primordium.
温度作为春化阶段的必要条件，从出苗到生长锥伸长表现为积温效应，从生长锥伸长到小穗原基出现表现为低温效应。
Efficient callus induction and regeneration procedure were established using growing tip of octoploid triticale'h739'at glume differentiation stage as explants. Embryonic somaclones were selected.
利用八倍体小黑麦`h739`护颖分化期幼穗作外植体，成功地建立了愈伤组织诱导和再生程序，并获得了长期保持胚性的无性系。
It is noticeble that when the hyphal tip growth ceased, the high intensity of TFP fluorescence usually disappeared in non-growing tips and became evident in newly emerged growing tips, which implied that the concentration of CaM shifted in concord with the transfer of growing point in hyphae.
顶端高浓度的CaM分布随着菌丝顶端生长点的转移而转移，当菌丝顶端生长终止时，高强度的TFP荧光在停止生长的顶端消失，出现在新形成的生长顶端。
Hyphae, loaded with CTC under pH 6.8 condition and then grown in pH 8.0 medium for a little while to destroy the apical acidification, could gave very diffuse fluorescence images of CTC membrame bound Ca〓 and vermiform fluorescence spots due to mitochondrias under pH 6.8 no longer were clearly distinquished, which implied that besides mitochondrias, other cellular organelles with Ca〓 also were stained with CTC. Thus mitochondrias are not the only one intracellular Ca〓 storage, endoplasmic reticulums and Golgi bodies in the same zone may be also the Ca〓 storages. But the extreme apical zone under 2μm of the growing hyphal tip was still almost devoid of stain under pH 8.0.The CTC fluorescence was concentrated in the subapic zone beyond about 2μm from the tip and then gradually became lower behind about 40μm from the tip. These results did not support the hypothesis which suggested that the cell wall vesicles in the extreme apical zone were intracellular Ca〓 storages.
将菌丝在pH6.8条件下负载CTC，再置于pH8.0培养介质中短暂生长一会儿以消散菌丝顶端的酸化区域，则CTC膜结合Ca〓呈现弥散的荧光影像，在pH 6.8培养条件下显示的蠕虫状的线粒体荧光斑点不再能够清晰辨认，说明除了线粒体之外，还有其它含Ca〓细胞器，也被CTC染色，线粒体并不是细胞内唯一Ca〓库，还可能包括内质网、高尔基体等细胞器，但菌丝最顶端2μm以前的细胞壁泡囊区域不能被染色，最大荧光强度仍位于菌丝顶端2μm以后区域，约45μm以后荧光变弱，实验结果不支持细胞壁泡囊为菌丝胞内Ca〓库的假设。
The results showed that, comparing with Zhongmian 19, the chlorophyll content of the third leaf from the stem top to bottom of Yuza 35 and Zhongmian 29 after tip pruning was high and decreased slowly with leaves ageing; The stomata conductance at early growing period and PSⅡ practical light chemical efficiency at later growing period of the third leaf were higher and decreased slowly with leaf senescence.
结果表明：杂交棉豫杂35和中棉29与常规棉中棉19相比，打顶后其主茎倒3叶片的叶绿素含量高，随叶片衰老下降的慢；叶片生长前期气孔导度大，生长后期叶片PSⅡ实际光化学效率大，从而使其叶片光合速率高，且随叶片衰老下降慢，在后期仍表现较强的光合速率。
The entire shoot apex of a horsetail could fit into the large apical cell in the growing tip of a fern.
木贼的整个茎尖可相当于蕨类生长锥中大的顶端细胞。
The growing stage, height of stem and ear position, ear length and ear width had not significant difference with common maize, but the length of bare tip of ear were notable shorter and number of ear grain and yield were notable higher than common maize.
转Bt基因玉米的生育期、株高、穗位高、穗长、穗粗等与对照差异不大，秃尖长明显短于对照，穗粒数和产量明显高于对照。
An elastic visco-plastic material model was adopted to the asymptotic analysis on power law and logarithmic singularity of dynamic growing crack tip.
本文利用弹-粘-塑性材料力学模型，对动态扩展裂纹尖端的指数奇异性和对数奇异性进行了渐近分析。
Root tip were short and thin, the growing point were only made up of few organized cells, cells of root cap were large but few.
叶脉维管组织发育不良，导管分子数目少，木质化程度低，根尖短而细，生长点仅由少数具分生能力的细胞组成，根冠细胞大，但数量少。
Pollen tubes are the polarized tip-growing system that delivers the male gametes towards the ovaries, which is very essential for sexual reproduction in higher plants.
摘要花粉管的极性顶端生长是将雄配子体运输到子房的过程，在高等植物有性生殖过程中起著重要的作用。
Pollen tube, a carrier of sperm nuclei during the process of sexual plant reproduction in flowering plants, is a highly polarized, rapidly tip-growing plant cell, and thus is an ideal system for studying the molecular mechanism involved in the regulation of cell growth.
在有花植物受精过程中，具有顶端极性生长特性的花粉管是雄性生殖单位的载体，同时也是研究细胞生长分子调控机理的理想体系。
It was same the developmental order of calyx, corolla and stamen of six species plants, their growing tip of floral buds formed in turn 5 calyx primordia, 5 corolla primordia and 5 staminate primordia.
其中6种植物的花萼、花冠及雄蕊的发育过程基本相同，均由花芽生长锥顶端依次向心分化出5个花萼原基、5个花冠原基及5个雄蕊原基发育而成。
With the binoculars and stereoscopic microscope, the meristem of shoot-tips containing growing cone and 1, 2, 3 or 4 leaf primordia separately were grafted on etiolated rootstocks to obtain shoot-tip grafted plantlets. And the pathogen of Citrus Yellow Shoot was determined by PCR technique.
在双目实体显微镜下，分别切取含有生长锥及1、2、3和4个叶原基的茎尖分生组织嫁接到黄化砧木上，以获得茎尖微芽嫁接苗，用PCR进行黄龙病分子检测。
This study claims a mechanism of DEF. At the tip of crack, ions deposit on the nuclear of ettringite, and the crystal keeps growing. As the space is limited, the huge crystallization pressure leads crack extend and macroscopical expansion.
本文提出膨胀机制的一种假说，在尖窄裂纹处，离子沉淀在钙矾石晶核上，使晶体不断生长，在有限的空间内产生巨大的结晶压力，导致了裂纹的扩展和宏观的膨胀。
There are 2 lagers of mantle cells at the tip of growing point.
在生长锥顶端有二层外套细胞。
Slow-growing economies that fall into recession are typically pushed, as some shock forces a pre-existing imbalance to tip them over.
但是经济发展速度慢了，则往往会陷入衰退。而衰退之前，事先就早已存在的失衡因素就会通过一些震荡显现出来了。
Deformation Analysis in the Vicinity of a Growing Crack Tip with Finite Element Method
扩展裂纹端变形的有限元分析