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pericyclic
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  周环
     Substituent Effect on Pericyclic Reaction of 2-Methyl Cyclobuten-2-ol
     2-甲基-环丁-2-烯醇周环反应中的取代基效应
短句来源
     HMO Calculation of Activation Energies of Thermal Pericyclic Reactions
     热周环反应活化能的HMO计算
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     Cation Radical Pericyclic Reactions
     正离子自由基周环反应
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     THE DERIVATION OF THE ODD-EVEN RULE FOR EXCITED STATE PERICYCLIC REACTIONS FROM HüuCKEL MOLECULAR ORBITAL THEORY
     从Hückel分子轨道理论导出激发态周环反应的奇偶定则
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     The Rules of Symmetry of Molecular O rbitals and Pericyclic Reaction
     分子轨道对称性规律与周环反应
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  “pericyclic”译为未确定词的双语例句
     Recent progress in the synthesisof C60 derivatives is reviewed according to the mechanism of organic chemical reaction, such as addition,oxidation-reduction, ionic reaction, pericyclic reaction, radical reaction, and so on.
     从有机反应的角度,概述了C60衍生物合成中的几个主要反应类型。
短句来源
     Root meristematic cells and pericyclic cells first divided.
     1 启动期 (0~ 3d) ,根尖分生组织细胞、中柱鞘细胞起动分裂。
短句来源
     The secretory canals,mainly distributing in the pericyclic parenchymna and secondary phloem,and occurring in a spallation-produced manner,were secondary ones and did not appeared in the primary structure.
     分泌道主要分布在中柱鞘薄壁组织和次生韧皮部中,均是裂生方式发生,属次生分泌道,初生结构中无分泌道存在.
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  相似匹配句对
     Cation Radical Pericyclic Reactions
     正离子自由基周环反应
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     PMO AND SELECTION RULES OF PERICYCLIC REACTIONS
     PMO与周环反应的选择性原则
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  pericyclic
The review is devoted to the photochromism of pericyclic reactions of crown-containing photochromic systems.
      
Cation-dependent pericyclic reactions of crown-containing photochromic compounds
      
Energetic, structural, and orbital criteria indicate the heteroelectric mechanism for the cyclization of compound E-3 and the pericyclic mechanism for the cyclization of compounds 1 and Z-3.
      
Pericyclic and Heteroelectrocyclic Mechanisms for the Cyclization of 1,3,5-Hexatrien-1-one and Its 6-Aza Analog
      
Expression was never detected in vascular tissue and was poorly correlated with lignification except in the cells surrounding primary xylem and pericyclic fibers in N.
      
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Chang Shan, the subterranean portion of Dichroa febrifuga Lour. (family Hydrangeaceae), and Shu Chi, the leafy tops of the same plant, have been used in Chinese medicine more than two thousand years, but their antimalarial action has been scientifically proved and constituents investigated only in recent years. A brief account of their history, botanical source, plant habit, cultiva-tion and collection and a detailed description of their sensory, macroscopical and microscopical characters are given. The important...

Chang Shan, the subterranean portion of Dichroa febrifuga Lour. (family Hydrangeaceae), and Shu Chi, the leafy tops of the same plant, have been used in Chinese medicine more than two thousand years, but their antimalarial action has been scientifically proved and constituents investigated only in recent years. A brief account of their history, botanical source, plant habit, cultiva-tion and collection and a detailed description of their sensory, macroscopical and microscopical characters are given. The important diagnostic features of Chang Shan are:-vessels with long oblique end-plates having well-marked scalariform perforations and often containing tyloses; septate xylem-fibres; idioblasts containing bundles of acicular crystals embedded in mucilage; thick-walled pericyclic fibres; the deep-seated origin of the cork. A well-marked medullary sheath of thick-walled, lignified and pitted parenchyma occurs in the pith of both the stem and rhizome. The important diagnostic features of Shu Chi are:-thick-walled, warty, unicellular trichomes; paracytic (rubiaceous) stomata; epidermal cells with pitted anticlinal walls and finely striated cuticle; water-pores in the teeth of the leaf; idioblasts with bundles of acicular crystals em-bedded in mucilage; droplets of fixed oil in most of the cells of the leaf; thick-walled pericyclic fibers from the stem as well as deep-seated cork and characteristic vessels as seen in the subterranean organs. The significance of some of the microscopical findings as a further illustration of the connexion between anatomy and taxonomy is also discussed.

1.常山是八仙花科植物黄常山Dichroa.febrifiuga Lour.的地下部分,而蜀漆是本植物的带叶枝梢,两者都有抗疟的效力。2.木文简单地介绍了前人研究常山的情况,然後详细地描述了,常出和蜀漆的性状和组织构造;并指出了某些组织特徵在分类学上的意义。3.常山的重要特徵是:(1)导管,末梢壁长而斜置,有显著的梯纹穿孔,并常含有侵填体;(2)分隔木纤维;(3)含草酸钙针晶束的异细胞,针晶束外有粘液包围;(4)厚壁的中柱梢纤维;(5)内生性的木栓层。根茎和茎的根部周围有显着的根鞘,根鞘由厚壁的木化细胞所成,壁上有单纹孔。 4.蜀漆的重要特征是:(1)厚壁有疣的单细胞毛;(2)平轴式气孔;(3)垂周壁上具有纹孔的表皮细胞;(4)叶绿锯齿上的水孔;(5)含草酸钙针晶束的异细胞,针晶束外有粘液包围;(6)脂肪油珠,存在於大多数叶肉细胞中。此外、并有由茎中来的厚壁的中柱鞘纤维和内生性的木栓层,以及特殊的梯纹导管,其形状和在地下器官部分所见的一样。

1). Rauwolfia verticillata (Lour.) Baill. (family Apocyanaceae) is an erect evergreen shrub growing wild in Kwangtung, Yunnan, and the islands of Taiwan and Hainan. An alkaloid, named Rauwolfia A (C_(25)H_(28)N_2O_2) was isolated recently from root and stem by Chao (赵承嘏) and proved to possess sedative and hypo- tensive activity. 2). The macroscopical, microscopical and sensory characters of the root and of rhizome were studied. The principal differences in microscopic structure between roots of R. verticillata...

1). Rauwolfia verticillata (Lour.) Baill. (family Apocyanaceae) is an erect evergreen shrub growing wild in Kwangtung, Yunnan, and the islands of Taiwan and Hainan. An alkaloid, named Rauwolfia A (C_(25)H_(28)N_2O_2) was isolated recently from root and stem by Chao (赵承嘏) and proved to possess sedative and hypo- tensive activity. 2). The macroscopical, microscopical and sensory characters of the root and of rhizome were studied. The principal differences in microscopic structure between roots of R. verticillata and R. serpentina, compared in a table, were also pre- sented. 3). The root is cylindrical, more or less branched, curved or slightly torturous slowly tapering toward the end. Externally, it shows a grayish-brown cork and many irregular longitudinal ridges and furrows. The fracture of thin pieces is short and irregular, that of thick pieces is irregular and splintery; the freshly frac- tured surface exhibits a grayish-brown cork, white to dark brown phelloderm and phloem which are easily peeled off, and a pale yellow central core of hard and com- pact wood, occupies about 3/4 to 4/5 part of the root in diameter, it possesses 1 to 4 growth rings and numerous, almost straight-arranged medullary rays. Odour indistinct, and taste bitter. 4). The important microscopical features of the root: The transverse section shows a stratified cork consisting of 3 to 16 alternating tangential bands of larger and smaller cork cells, both of them possess thin, lignified wall. Phelloderm con- sists up to about 10 layers of tangentially elongated parenchymatous cells, most of which contain starch grains and calcium oxalate crystals. Secondary phloem shows starch- and crystal-bearing phloem parenchyma and sieve tubes traversed by phloem rays, the latter being of mostly from 1 to 2 cells, occasionally up to 4 cells in width containing abundant starch grains and a few calcium oxalate crystals and from 7 to 16 cells high in the tangential-longitudinal sections; selerenchymatous fibres which measure 330-670μlong and 13-30μ wide and stone cells which measure up to 70 μ in diameter are scantily scattered singly or in small groups of 2 in the outer part of the secondary phloem and the inner part of phelloderm of the older thick parts of the root, both possess pitted lignified wall. Wood wedges consist of wood fibres, wood parenchyma cells, vessels, tracheids and shorter rays, the cell walls of all these elements are lignified; vessel elements varied greatly in shape and size, from isodiametric or irregular circular, oval, spindle shape, polygonal to cylindrical, up to 760 μ long and 70 μ wide, some of the vessels exhibit tylosis or gummy lignin in the cavity; tracheids measuring up to shout 290 μ long, and 35μ wide with moderately thick end and pitted walls; wood fibres up to 1520μ long and 30 μ wide possess tapered to abruptly tapered ends, and rarely bifurcate, walls with simple and obligue pits: 5). The chief microscopical characters of the rhizome are as follows: the cork shows a similar stratification to that of the root. Inside is a outer narrow zone of phelloderm followed by an inner broad zone of starch- and crystal-bearing par- enchyma in which numerous isodiametric or irregular, elongated stone cells, scle- renehymatous fibres, and latex cells are scattered; stone cells with lignified wall are arranged singly or in groups of 2 to 3, and measure up to 270 μ long, and 115μ wide; selerenchymatous fibres with tapered ends and lignified wall are more longer than that of the root and measure up to 860 μ long, 60 μ wide; pericycle, usually broad, contains a few thick, non-lignified pericyclic fibres which are scattered singly and measure up to 2850 μ long, 20μ wide; the fibres show taping and often lobed ends, with alternate, constricted and enlarged portions having thin wall and broad lumen which measure up to 30μ wide and concentrically zoned in cross, section. The bundles are of bicollateral type, constituted of external phloem, xylem, and internal phloem; vessels are shorter than that of the root, up to 690 μ long, 50 μ wi- de; wood fibres are longer than that of the root, up to 1610μ long, 30μ wide; in- ternal phloem forms a ring at the margin of the pith containing starch grains, calcium oxalate crystals and a few selerenchymatous fibres which are similar to that of the cortex; numerous irregular amorphous masses of brownish colour also occur in the root and rhizome. 6). The starch grains are mostly simple, with a few 2 to 3-compound grains, the individual grains are spheridal, ovoid, elliptical, and possess a centric point or clift hilium, measuring up to 17μ in diameter; no distinet polarization and strati- fications are visible. 7). The monoclinic prisms, tabular crystals, clusters, and a number of twin crystals of ealeium oxalate were found in the root and the rhizome measuring up to 43μ long; they are often arranged in longitudinal rows.

本文簡单地介紹了过去数年內国外方面对于几种蘿芙木屬Rauwolfia植物生藥的生藥学研究結果,然后就国产蘿芙木R.verticillata(Lour.)Baill.的植物形态、分布、根和根状茎的形状、組織构造及粉末特征,分別作了較全面而詳細的描述,以备今后鑒定生药原料时的参考,并附有说明插图14幅。根据本研究的结果,发现本种根与印度蛇木根在组织上有种种差异(参照前表1).此外,本文并报告芙木根的水分、灰分、酸不溶性灰分及全植物硷含量的测定结果,萤光试验的结果,以及几种植物硷反应的试验。

The root barks of Aralia mandshurica Rupr. et Maxim. and A. elata (Miq.) Seem. are known as "Ci-Lao-Yia" in the indigenous medicine of northeastern China and have long been used as a general tonic. In this paper the pharmacognostical features of the bark of A. mandshurica are described and illustrated. The drug consists mostly of root bark with a few rootlets attached and some barks of the rhizome and of the lower part of stem are also present. The principal microscopical features of the drug are: (1) the...

The root barks of Aralia mandshurica Rupr. et Maxim. and A. elata (Miq.) Seem. are known as "Ci-Lao-Yia" in the indigenous medicine of northeastern China and have long been used as a general tonic. In this paper the pharmacognostical features of the bark of A. mandshurica are described and illustrated. The drug consists mostly of root bark with a few rootlets attached and some barks of the rhizome and of the lower part of stem are also present. The principal microscopical features of the drug are: (1) the secretory canals arranged in 4 to 11 rings occuring only in the cortex and phloem; (2) the crystal-bearing parenchyma cells occuring more abundantly in the cortex than in the phloem; (3) the pericyclic fibres are found only in the barks of rhizome and stem, other sclerenchymatous cells are absent; (4) the crystals mostly in clusters measuring about 20 to 56μ in diameter; (5) the starch grains mostly simple with a few 2 to 4-compound grains measuring about 2 to 9μ in diameter; (6) the rays being 1 to 6 cells wide filled with starch grains and amorphous resin-like substance. Fluorescent analysis and chemical tests have been made. The percentage contents of the water, total ashes, water and alcohol extractives of the drug have also been determined.

本文就我国东北地区所产刺老鴉的一种,龙牙楤木Aralia mandshurica Rupr.etMaxim.根皮的形态、組織和粉末生药的特征,进行了較詳細的观察和記載。此外,还做了化学試驗和螢光检查,并对生药的水分、灰分和浸出物的含量也作了初步測定。

 
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