查询词典 birch

The reproductive development process of birch was described as follows: Male inflorescences extended from apical bud in early June. In later June, stamen primodium was differentiated in the bract of male inflorescence and the differentiation of bract was generated in female inflorescence. During July, anther layers and archesporial cell were differentiated in anther, then archesporial cell developed into mother microspore cell. Pistil primodium came into being at the same time. In early part of August the meiosis of mother microspore cell started. In later August, mono-nucleus microspore was formed. After September, both male inflorescence and female inflorescence were dormant.

白桦的生殖生长发育过程如下：6月初，雄花序从顶芽中生长出来。6月中下旬，雄花序苞片上分化出雄蕊原基，雌花序分化出苞片。7月，雄花花药分化出花药壁和孢原细胞，孢原细胞演化为小孢子母细胞，雌花序苞腋处分化出雌蕊原基；8月中上旬，小孢子母细胞减数分裂，8月下旬形成单核小孢子；9月后雄花序以单核小孢子状念越冬，雌花序以雌蕊原基状念越冬。

In the poetic field, he has toiled for over 30 years, publishing short poetry collection of Stars, Eyes of Mother, 70 Romantic Poems by Qiao Yan, The Green Romantic Poems, Double-mast Sail of Love, Romantic Career in the Army, and Selection of Poems by Qiao Yan; narrative long poems like The Silent Woods of Birch, The Noble-minder, and The Song of a Soldier and an Era; long autographic work Wei Wei, 28 volumes of prosaic collection like Love being Forgotten, The Passion of Soldiers, and Stepping into The Alps.

在诗的园地里，他辛勤劳作三十余载，出版了《星星，母亲的眼睛》、《峭岩情诗70首》、《绿色的情诗》、《爱的双桅帆》、《浪漫军旅》、《峭岩诗选》等短诗集；《静静的白桦林》、《高尚的人》、《一个士兵和一个时代的歌》等叙事长诗；《中国西部摄影诗》、《我的祖国》、以及长篇传记文学专著《魏巍》、散文集《被遗忘的爱》、《士兵的情愫》、《走进阿尔卑斯山》等著作28部。

We are the agent of USA importers to purchse plywood (Okoume, birch, ayous, poplar, pine,etc) and fancy plywood into USA market. Welcome plywood manufacturers contact with us.

COSCO STAR Int'l Co。，Ltd 北京市Beijing 我公司为美国胶合板进口商在中国采购各种胶合板（奥古曼、桦木、阿尤斯、杨木、松木等）及贴面板，在美国市场销售，年销售额1000万以上，欢迎胶合板厂商与我们联系。

Hunan Province commodities issued by Quality Supervision and Inspection and the inspection report, concluded that:"sample site for Betulaceae birch trees."

3 28，湖南省质量监督检验检查报告，发出商品的结论是，桦木科桦木树：&示例站点。&

To harmful microflora white part of birch bark is obliged precisely to betulin.

稳定有害菌群白桦树皮部分恰恰有义务为桦木醇。

MATERIAL AND METHODS: Betulin was isolated from dry powder of the bark of silver birch by using ethanol circumfluence, decompress concentration and methanol-chloroform recrystallization.

材料与方法：取一定量的白桦树皮干粉，通过乙醇回流，减压浓缩和甲醇-氯仿重结晶等步骤获得白桦酯醇纯品。

BACKGROUND ＆ AIM: Betulin is an important triterpene. We investigated the antitumor activity of betulin, extracted from the bark of silver birch.

背景与目的：白桦酯醇是一种重要的三萜类生物活性分子，本文从白桦树皮中提取获得白桦酯醇纯品，然后研究该生物活性分子抑制食管癌细胞的活性。

And a birch bark compound, betulinic acid, is being tested as a treatment for melanoma and other serious diseases.

一、桦树皮大院桦木酸，正测试作为治疗黑素瘤和其他严重疾病。

Betulin, a naturally occurring triterpene, available in abundance up to 10% dry weight of bark from white birch bark, seems to be an ideal starting material for the synthesis of betulinic acid.During a discovery effort from natural resources, in order to seek new biologically active compounds, reaearch on chemical modifications of valuable precursors have been demonstrated to be an effective path to resolve the water solubility problem and increase bioavailability.

从自然界寻找先导活性化合物，再进行结构修饰，试图提高其活性，降低其毒副作用，并提高其水溶性，是创新药物的一条重要思路，而且在新药研制中也得到了很好的应用并取得了显著的成绩。

PA-457 was not just another Taxol, the anticancer drug that required the controersial felling of rare yew trees until a semisynthetic substitute was found. Panacos did not need a steady source of Taiwanese herbs. Betulinic acid could be extracted from ubiquitous plane and birch trees, and a subsequent processing step yielded the desired molecule.

PA-457不像抗癌药物太平洋紫杉醇：在太平洋紫杉醇的合成代替品出现前，砍伐罕见的太平洋紫杉一直引发争议；Panacos并不需要有稳定供应的台湾药草，桦木酸能从普遍存在的悬铃树和桦树中提炼，并且只要一个后续处理步骤，就可以制造出所需的分子。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。