膜状的

The ultrastructural changes during the development of sieve element companion cell complex (SE/CC complex) in Populus deltoides were investigated using electronic microscopy. The result showed that SE and CC tome from the same secondary phloem mother cell. The development of sieve element went through three stages, i. e. immature, mature, and degenerate stage. In immature stages the sieve element presented radial expansion, cell wall thickening, and production of sieve plastid and P-protein. The cytoplasma selectivly autolysed in mature stage. At the same time, karyoplasm was dispersed, and nuclear envelope was not clear, or karyoplasm was disorgnized, and nuclear envelope was clear. The karyopalsm finally turned into P-protein. In degenerate stage, the cytoplasm completely disappeared, and the function was lost.

利用电镜技术研究美洲黑杨次生韧皮部筛管和伴胞发育过程中细胞超微结构的动态变化，观察到筛管和伴胞由同一个次生韧皮部衍生细胞分裂分化形成筛管约发育历经未成熟期、成熟期和衰退期的变化未成熟期筛管分子表现为细胞的径向扩展、壁的增厚、筛管质体和P-蛋白质的产生；成熟期筛管分子细胞组分发生选择性自溶，细胞核核质弥散状，核膜不清晰，或核膜清晰而核物质降解，最后细胞核完全解体转化为P-蛋白质类的物质；衰退期筛管分子细胞质完全解体消失，失去功能。

The effects of racemate initial concentration, volume ratio of surfactant to organic solvent, pH value in internal or external phase, pH gradient from external to internal phase, ligand metallicion and system temperature on the performances of chiral separation were discussed.

摘 要：研究在含有Cu2+和N-n-十二烷基-L-脯氨酸手性配体的乳状液膜体系中手性萃取分离氧氟沙星对映体的效果，以及外消旋体的初始浓度、表面活性剂与有机溶剂的体积配比、内外水相pH值、从外水相到内水相pH值梯度变化以及配位金属离子与体系温度对液膜手性分离性能的影响。

The membranes were transformed from amorphous phase toα-Al_2O_3 crystalline phase by 5 hours annealing at 800℃and 910℃. At the same time, aluminum and amorphous alumina were found by XRD patterns. The membrane had little change in front side after 5 hours annealing at 800℃, while the back side was transformed from ruleless distributing to cluster distributing.

膜在800℃及910℃下退火5h后，由非晶态的氧化铝转变成为晶态的α-Al_2O_3，但同时也有铝单质和无定形结构的氧化铝存在，膜在800℃下退火5h后的正面没有太大变化，背面由无规则的分布变为簇状分布。

Sessile spikelet flat, convex or concave across back; lower glume lanceolate to ovate, membranous to leathery, smooth, marginally 2-keeled or rounded; upper glume boat-shaped; lower floret male or barren, with or without palea; upper floret bisexual, with entire awnless lemma.

无梗小穗平，凸的或凹的直径背面；更下部的颖片披针形到卵形，膜质到革质，清除，稍微龙骨状或圆形；上面颖片舟状；更低的小花男性或者不孕，有或没有内稃；上面小花两性，具全缘外稃。

Bractlets rudimentary, membranous, scale-like, hidden by perianth; stigmas papillose or hairy throughout; embryo planospiral.

初步，膜的小苞片，鳞片状，被花被隐藏；有毛的柱头具小乳突的或全部；胚平面螺旋状 3

Results: The number of BrdU-positive cells in the subventricular zone and in the subgranular zone of dentate gyrus,and the numbers of ChAT-positive cells in medial septumand diagonal band of the basal forebrain were significantly decreased in lead exposed group P

结果：铅中毒大鼠齿状回的颗粒下层、侧脑室室管膜下区的BrdU阳性细胞数、基底前脑内侧隔核和斜角带核的ChAT阳性细胞数以及大脑皮质和海马齿状回NF阳性神经元数、嗅球BrdU+NF阳性细胞数目以及学习记忆能力明显下降，GFAP阳性细胞反常升高P

Dinoflagellate have many traits different from prokaryotes and eukaryotes:the cells have nuclei, but the nuclear membrane is discontinuous; There are many chromosomes in the nuclei, but the chromosomes remain permanently condensed during cell cycle; The cristae of mitocondria is tubular, and the cells have no typical endoplasmic reticulum.

甲藻细胞虽有核膜，但双层核膜不连续；有多个形态结构完整的染色体，但染色体在整个生命周期中永远处于高度凝集状态，DNA纤维的折叠方式与典型真核生物中期染色体完全不同；线粒体的嵴为管状。

Results: After cryofixation,basement membranes of skeletal muscle consisted of only one electron dense layer, T tubules were round, core cylinders were observed in terminal cisternae and there were thread-like protein particles on the membranes of terminal cisternae.

结果：冷冻固定后，缝匠肌基膜仅仅由电子密度高的一层组成；横小管为圆形；终池内含有电子密度高的环形物，终池膜上存在一排线状电子密度高的蛋白颗粒。

After the LB film of dipalmitoylphosphatidylcholine was treated by 2.5mmolL^(-1) potassium oxalate, the structural differentiation between liquid expanded phase and liquid condensed phase in LB film was strengthened and circular defects appeared.

经2.5mmolL^(-1)的草酸钾溶液对二棕桐酰磷脂酰胆碱的LB膜进行处理后，可强化LB膜中液态扩张相化E）和液态凝聚相之间的结构差异，原子力显微镜证实了圈状缺陷的存在。

Result vitamin A and 4HPR fall to Hela cell collect form have apparent inhibition, can restrain Hela cell to be opposite the action causing tumor of naked rat (the curb tumour action of P.01); vitamin A issues visible cell solid by force to shrink at 4HPR(P.01); report lens, nuclear film is screwy, nuclear chromosome gathers agglomerate stand by the wither such as nuclear film to die DNA of cell of cellular feature; by degradation, a collection of illustrative plates of typical " of shape of " a flight of stairs appears in electrophoresis of agaragar candy gel.

结果维生素A和4HPR对Hela细胞集落形成有明显抑制功能，并可抑制Hela细胞对裸鼠的致瘤功能(P.01)；维生素A的抑瘤功能强于4HPR(P.01)；电镜下可见细胞固缩，核膜扭曲，核染色体聚集成块并靠近核膜等凋亡细胞特征；细胞DNA被降解，在琼脂糖凝胶电泳中呈现典型的&阶梯状&图谱。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。