Histogen theory A theory, proposed by Hanstein, in which the apical meristem is considered to consist of three main zones, the dermatogen, periblem, and plerome, which differentiate into the epidermis, cortex, and stele respectively.

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Stellar arrangements vary considerably in plants from the simple protostele, in which leaf gaps are absent, to the complex dictyostele, in which there are many closely spaced LEAF GAPS.

各種中柱排列方式在植物中有很大的差異性欧美人妻一级A片，從葉隙消失的原生中柱到聯(lián)系有許多葉隙的復(fù)雜網(wǎng)狀中柱亚洲午夜一区二区三区福利。

Stele The vascular tissue and associated parenchyma tissue and the surrounding pericycle and endodermis of a stem or root.

中柱：包括根或莖的維管組織及相關(guān)薄壁組織，若有維管束鞘和內(nèi)皮包被則這二者也屬于中柱結(jié)構(gòu)欧美一区永久视频免费观看。

After the structure was optimized, the intensity utilization coefficient of horizontally side-post, arch steel tube and mid-post increased 18%, 3%and 25%respectively, the vertically side-post which was utilized insecurely and insatiably utilized securely, stably, and reasonably, and steel of main body was saved about 3.7%.

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Surrounding the central cylinder is the pericycle.

圍繞中柱的是中柱鞘中文字幕日本黄色视频。

Eustele The STELE arrangement found in most gymnosperms and dicotyledons in which the vascular tissue is arranged into a ring of discrete bundles separated by medullary rays, all contained within a single ring of endodermis and pericycle.

真中柱：發(fā)現(xiàn)于大多數(shù)裸子植物和雙子葉植物的中柱類型，其維管組織由不連續(xù)的性视频在线视频网站，被髓射線分開維管束排列成環(huán)狀亚洲一区精品视频在线观看。所有的微觀組織都包含在內(nèi)皮層和中柱鞘以內(nèi)。

Centrarch Denoting a protostsele in which protoxylem is at the center of the axis.

心始式：一種原生中柱的類型有99个黄色视频的黄色网站，在心始式中柱中在线观看AA，原生木質(zhì)部位于軸的中央。

Another experimental program is conducted, which purpose is to study the behavior of slab-column connections with nonrectangular columns subjected to earthquake forces.

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In functional study, overexpression assay was conducted in potato. Interestingly, tuberous swelling along roots was observed in some transgenic potato lines in addition to stem-derived tuber formation. Conclusively, we propose a hypothesis to illustrate the mechanism by which IbMADS1 participates in the initiation of tuberization in sweet potato.

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I sometimes dream of a larger and more populous house, standing in a golden age, of enduring materials, and without gingerbread work, which shall still consist of only one room, a vast, rude,substantial, primitive hall, without ceiling or plastering, with bare rafters and purlins supporting a sort of lower heaven over one's head —— useful to keep off rain and snow, where the king and queen posts stand out to receive your homage, when you have done reverence to the prostrate Saturn of an older dynasty on stepping over the sill; a cavernous house, wherein you must reach up a torch upon a pole to see the roof; where some may live in the fireplace,some in the recess of a window, and some on settles, some at one end of the hall, some at another, and some aloft on rafters with the spiders, if they choose; a house which you have got into when you have opened the outside door, and the ceremony is over; where the weary traveller may wash, and eat, and converse, and sleep, without further journey; such a shelter as you would be glad to reach in a tempestuous night, containing all the essentials of a house, and nothing for house-keeping; where you can see all the treasures of the house at one view, and everything hangs upon its peg, that a man should use; at once kitchen, pantry, parlor, chamber, storehouse,and garret; where you can see so necessary a thing, as a barrel or a ladder, so convenient a thing as a cupboard, and hear the pot boil,and pay your respects to the fire that cooks your dinner, and the oven that bakes your bread, and the necessary furniture and utensils are the chief ornaments; where the washing is not put out, nor the fire, nor the mistress, and perhaps you are sometimes requested to move from off the trap-door, when the cook would descend into the cellar, and so learn whether the ground is solid or hollow beneath you without stamping.

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dictyostele：網(wǎng)狀中柱

木質(zhì)部的分子多有環(huán)紋螺紋或梯紋管胞以及韌皮薄壁細(xì)胞組成,但無伴胞,現(xiàn)存的蕨類大多無形成層,所以沒次生結(jié)構(gòu). 蕨的中柱(stele)類型是多種多樣的,主要有原生中柱(protostele)99玖玖玖精品国产、管狀中柱(siphonostele)国产精品对白交换、網(wǎng)狀中柱(dictyostele)和具節(jié)中柱.

dictyostele：網(wǎng)狀中柱 網(wǎng)狀中柱

diazomethane 重氮甲烷 重氮甲烷 | dictyostele 網(wǎng)狀中柱 網(wǎng)狀中柱 | die 中模 模圈

monostele：單體中柱

03.366 中柱學(xué)說 stelar theory | 03.367 單體中柱 monostele | 03.368 原生中柱 protostele

newel post：螺旋樓梯中柱

newel 螺旋樓梯中柱 | newel post 螺旋樓梯中柱 | newel stair 有中柱的螺旋樓梯

newel post：樓梯端柱,螺旋型樓梯中柱,端柱

newel drop 樓梯欄桿柱垂飾 | newel post 樓梯端柱,螺旋型樓梯中柱,端柱 | newel wall 樓梯隔墻

protostele：原生中柱

根據(jù)髓的有無和維管組織的排列方式,中柱基本上可以分為原生中柱(protostele)和管狀中柱(siphono-stele)兩大類. 原生中柱是具有木質(zhì)部的實(shí)心柱,外為韌皮部包圍,根據(jù)木質(zhì)部在橫切面上的形狀,又可分為幾個(gè)類型. 原生中柱是中柱中最簡單的和最原始的類型,

protostele：原生中柱 原生中柱

protostane 原類固醇烷 原萜烷 | protostele 原生中柱 原生中柱 | prototroph 無機(jī)營養(yǎng)生物 原養(yǎng)型

siphonostele：管狀中柱

木質(zhì)部的分子多有環(huán)紋螺紋或梯紋管胞以及韌皮薄壁細(xì)胞組成,但無伴胞,現(xiàn)存的蕨類大多無形成層,所以沒次生結(jié)構(gòu). 蕨的中柱(stele)類型是多種多樣的,主要有原生中柱(protostele)、管狀中柱(siphonostele)国产特级毛片无码专区、網(wǎng)狀中柱(dictyostele)和具節(jié)中柱.

stele：中柱

中央柱(centralcylinder)亚洲爆乳AAA无码专区、維管柱(vascularcylinder)、中柱(stele)三者一方面都是同義詞,指莖和根中的維管組織及其結(jié)合的基本組織所組成的部分;另一方面也各有特點(diǎn),如中央柱是一個(gè)通用名詞,由于大多數(shù)種子植物莖不存在顯著的內(nèi)皮層和中柱鞘,

stelar theory：中柱學(xué)說

中柱學(xué)說(stelar theory)是認(rèn)為維管植物的根和莖的初生結(jié)構(gòu),系由皮層圍繞著由維管組織組成的中央柱狀結(jié)構(gòu)--中柱構(gòu)成的學(xué)說. 中柱的概念最初由法國植物學(xué)家P.van.蒂耶蓋姆1886年提出,后經(jīng)其學(xué)生們發(fā)展為中柱學(xué)說. ①原生中柱:在維管組織的中央由木質(zhì)部組成.