叶脉

Ginkgo biloba leaf petiole, is actually composed of many vein from the collection of vascular bundle group.

银杏叶的叶柄，实际上是由许多叶脉集合而成的维管束群。

Leaves palmately 3(-5)-foliolate; stipules membranous, lanceolate, ca. 8 mm, caducous; petiole 8-20 cm; terminal petiolule 2-5 cm, lateral petiolules 5-20 mm; leaflet blades ovate, elliptic, obovate, or elliptic-ovate, 7-15 × 4-8 cm, papery, sparsely pubescent only on nerves, glabrescent, base broadly cuneate to obtuse, margins with 2 or 3 teeth per cm, apex acute or caudate-acuminate.

叶具掌状3(-5)小叶；托叶膜质，披针形，约8毫米，早落；叶柄8-20厘米；顶生小叶柄2-5厘米，侧生小叶柄5-20毫米；小叶叶片卵形，椭圆形，，或椭圆状卵形， 7-15 * 4-8 厘米，纸质，只在叶脉具稀疏短柔毛，后脱落，基部宽楔形到钝，边缘每厘米具2或3牙齿，先端锐尖或尾状渐尖。

It was found that the RBSDV particles infected in the maize cell appeared at first in the cytoplasm near the cell wall, some single virus particles seem to be connected with plasmodesma.

的症状发展过程先后取叶脉做超薄切片，在透射电镜下观察病毒在细胞内的侵染状态，并在取样前用灰飞虱无毒若虫进行饲毒和传毒试验。

Results showed: in Podocarpus leaves, there is only one midrib, the xylem tracheid of midrib vascular bundle is multi-form, transfusion tissue belongs to Cycas-type and transfusion tracheids are isodiametric, the accessory transfusion tracheids between palisade tissue and sponge tissue are developed; in Nageia leaves, there are plenty of parallel leaves, the xylem tracheids of each vein are relatively simple, transfusion tissue belongs to Taxus-type and transfusion tracheids are longer in longitudinal section than that in transverse section, the accessory transfusion tissue between palisade tissue and sponge tissue is absent.

结果表明：罗汉松属叶1条主脉，主脉维管束木质部管胞发达，转输组织为苏铁型，转输组织管胞等径，栅栏组织和海绵组织之间的副转输组织管胞发达；竹柏属叶多条平行叶脉，维管束木质部管胞相对不发达，转输组织为红豆杉型，转输组织管胞纵向伸长，栅栏组织和海绵组织之间不存在副转输组织。

By analysing the feature of ITS sequence of monocots with reticulate vein,the differentiation and variation characters of ITS sequences in the families,genera and species studied were discussed.

并通过分析单子叶网状叶脉植物和菝葜科部分种类的ITS序列特点，研究了该片段在科、属、种间存在的关系和变异特点。

Leaves tufted; stipes 15-30 cm long, densely scaly at base, glabrous above; sterile lamina about 60 cm long and 20 cm wide, simply pinnate; pinnae numerous, alternate or subopposite, linear-lanceolate, the largest about 12 cm long and 1 cm wide, base cordate, apex acuminate, margin finely toothed; veins close, forking once or twice and forming areoles near the midrib; fertile lamina similar to sterile ones, but somewhat reduced, about 8 cm long and 0.4 cm wide, lower surface almost entirely covered with sporangia.

叶簇生；叶柄长15-30厘米，基部密被鳞片，向上近光滑；不育叶片长约60厘米，宽20厘米，一回羽状；羽片多数，互生或近对生，线状披针形，最长者长达12厘米，宽约1厘米，顶端长渐尖，基部心形，边缘有细密锯齿；叶脉1-2次分叉，近中脉形成网眼；能育叶与不育叶相似，但较小，长约8厘米，宽约0.4厘米，下部满布孢子囊。

Leaves are simple, without stipule, usually spirally arranged, the venation parallel.

单叶，通常螺旋状排列，叶脉平行，无托叶；花序顶生，头状或穗状；花通常小型，两性，规则。

Branching dichotomous; submarginal leaf veins absent or obscure; corolla tube long or short.

分枝二歧； submarginal叶脉无的或不明显；花冠筒长或短。

From the tests,we have obtained some structural variant features related with salt resistance and demonstrated the successful introduction of Rhizophora apicularta DNA into tomato.This thesis contains two parts. In the first part,the morphological and anatomical structures of the leaves were investigated. As to the morphology,some difference between control and transformed tomato were found. The leaf dimensions of the transformed tomato with unextended leaves were smaller than that of control. These structure changes should help to decrease the evaporation of water effectively and release the physiological drought resulted from saline.

本实验分两部分：第一部分、对转化番茄的形态及细胞显微结构进行观察与分析，实验表明转化番茄形态与对照相比有明显的变化，其叶面积变小，叶形收拢，这种结构可有效地减少水分的蒸发，缓解由盐胁产生的生理干旱；组织解剖结构结果显示，耐盐番茄在细胞结构上发生了明显的变异：其气孔器倾向下陷，表皮毛增多，叶脉微管组织不发达，微管束周围出现增多的贮水细胞，叶缘及其它部位表面分化出大型的多细胞分泌型结构，这些结构与转化番茄后代较强的耐盐能力有关。

Any of several delicate Asiatic orchids grown especially for their velvety leaves with metallic white or gold veining.

亚洲产的精致兰花中的任何一种，栽培供观赏其带有金属性白色或金色叶脉的柔软的叶子。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。