化学元素

用固体粉状化学元素取代MS培养基中的母液，制作培养基。

A solid powdered chemical element was used to replace the mother liquid of the MS medium .

31年生人工刺槐（Robiniapseudoacacia）林内各种植物的化学元素含量以C素最高，尤以刺槐树干中C含量多。

C is found to be the most abundant element in the various plants of 31-aged Robinia pseudoacacia plantation , especially in the trunk of Robinia .

卡拉汉假定化学元素放射电磁信号。

Callahan posits that chemical elements radiate electromagnetic signals .

汞的化学元素符号是什么？

What 's the chemical symbol for mercury ?

北京PM（10）中化学元素组成特征及来源分析

Characteristics of Chemical Elements in Beijing PM_ ( 10 ) and Their Source Apportionment

在~（14）C、古地磁、氨基酸测定、微体古生物，矿物和化学元素测试分析的基础上，划分了本区的沉积层及年代。

Based on analyses by 14C , paleomagnetism , amino acid , micropaleontology , minerals and geochemistry , the stratification and their depositional period are determined .

在这种富含碳这种物质的碎片中，科学家们发现，其中具有某种与DNA关键成分相类似的化学元素，此中元素相当于构成生命的基石。

The carbon-rich fragments were found to contain chemicals similar to one of the key components of DNA , the building blocks of life .

后者为生命基础的化学元素（C、N、P、S）在地球系统中的运动。

The later is related to the movements of key elements essential to life ( C , N , P , S ) in the Earth system .

与烤烟体内主要化学元素含量相比，烟苗体内的N、K、Ca、Mg含量特别丰富，尤其是烟苗的小十字期。

K , Ca , Mg contents of tobacco seedlings were richer than those of tobacco plants , especially two to three leaves stage .

因此，化学元素N、P、K的累积及大棚栽培年限过高是大棚土壤的主要连作障碍因子。

Therefore , accumulation of chemical elements N , P , K , and excessive length of greenhouse cultivation soil were the main obstacles to continuous cropping . 2 .

所有的CCA化学元素的流失情况，红松比南洋松更明显。

All of the CCA components were leached significantly more in red pine than southern pine .

通过分析船用柴油机排气中各种有害物的形成机理及化学元素平衡关系，从柴油机结构、燃油和进气条件等三方面分析了其对船用柴油机氮氧化物（NOx）排放特性的影响。

NOx emission character of marine diesel engine is analyzed in the aspects of engine structure , fuel oil and air in-taking condition .

氧原子O是化学元素中的一个，最稳定的存在方式是两个氧原子结合而成的氧气O2；

Oxygen atom O is one of chemical elements , and most steady existing way with oxygen atom is diatomic species O2 .

样品用质子激发X荧光（PIXE）方法进行了分析，得到大气颗粒物化学元素浓度及其谱分布。

The elemental concentrations and elemental distribution of particles were obtained by PIXE method . RIA was used to examine the concentration of estradiol and progesterone .

研究南极苔藓地衣中地球化学元素的营养富集特征，发现K、Ca为苔藓地衣中最活跃元素，主要以主动吸收的方式累积于苔藓地衣植物中；

Studies on the nourishing properties of geochemical elements in Antarctic mosses and lichens show that potassium and calcium were the most active elements , while phosphorous was accumulated in the middle part of lichen cells , and participated in organic synthesis .

对比地表枯枝落叶层化学元素总量与人工林元素的积累量，以Na的比值最高，Ca、Mn、Fe、Zn比值次之，元素归还量都较大。

Comparing the amount of elements in litter with which in plantation , the ratio of Na is the highest one with the higher ratio of Ca , Mn , Fe , Zn . These elements will gradually return to the soil .

作者采用基于分形理论的含量面积法来确定地球化学元素的异常下限，同时以具有强大的数据处理能力和空间信息处理能力GIS技术为平台，构建出地球化学异常的自动圈定的新方法。

The authors introduce a new technique to delineate geochemical anomalies automatically , adopt a content-area method based on fractal theory to find the low limit of geochemical anomalies , and take the technology of GIS as the platform of mass data and space information management .

金一直被认为是一种相对惰性的化学元素，但是近年来的研究发现，金催化剂对于CO及VOCs的低温氧化表现出很高的催化活性。

Au has been considered as one of the least active catalysts for a long time . However , recent research discovered that the supported Au catalyst showed high activity for the low temperature oxidation of CO and VOCs .

“对轻元素特别灵敏”的特点决定了GEXRF的应用领域将主要集中在化学元素微量和痕量分析以及半导体工业中Si薄膜表面轻元素检测等方面。

The special feature of " being more sensitivity to light elements " decides that the micro - and trace analysis of chemical elements and the determination of low-Z elements on silicon wafer in semiconductor industry are the most potential applications of the technology .

采用X射线衍射、激光粒度分析、等离子光谱分析等方法对长江、黄河悬浮物和山东青岛、济南尘暴物质进行了矿物组成、粒度组成和化学元素分析。

The X-ray diffraction analysis , laser size analysis and plasma spectrometric methods were used to analyse the mineral compositions , size compositions and chemical elements of the suspended materials taken from the Huanghe and Changjiang Rivers and the dust storm materials taken from Shangdong Province .

过渡层化学元素分布不均匀，其中Zr与Mg分布特征相同，Zr与Ni分布位置互补，Cr、Al主要以氧化物形式位于晶粒边界处。

Chemical elemental distribution is not homogeneous in every transitional coating . Zr and mg elemental distribution is similar , yet the distribution of Zr and Ni is supplementary . Cr and Al elements are placed as oxide inclusions in the boundary area between splats .

许多化学元素的名称与符号看起来并不匹配，因为元素的符号通常来源于拉丁文，如金对应符号的是“Au”。不过也有例外，例如元素钨的符号就是“W”。

A lot of the names and symbols of the elements don 't seem to match , but that 's usually because the symbol comes from a Latin translation , like gold 's " Au . " The exception is tungsten , whose symbol is " W. "

金相组织、扫描电镜腐蚀形貌分析和波谱仪成分分析表明，化学元素分布均匀、金相组织均匀细小是电解Al-Si合金具有良好耐蚀性能的原因。

The experimental results on microstructure and corrosion morphology by SEM and chemical composition analysis by WDS indicate that the excellent corrosion resistance of electrolytic Al-Si alloy is related to both the homogeneity of chemical composition and the fine microstructure of alloy .

本研究通过电感耦合等离子体质谱（ICP-MS）技术检测和分析中国南部不同地区褐飞虱体内化学元素组分及特征，并且对褐飞虱、寄主水稻及土壤体系中化学元素的浓度变化进行比较。

The aim of this study was to determine and analyze the content and feature of chemical elements in Nilaparvata lugens ( N. lugens ) from different regions of China by ICP-MS , and to compare the changes in chemical element concentrations in the soil-rice plant-N , lugens system .

据生物组分、矿物成分和主要化学元素的垂向变化，分为三带：文石质生物富积带（60m以浅）；

According to the vertical change of their organic composition , mineral composition , and main chemical elements , they are obviously divided into 3 zones : 1 . Rich aragonite organism accumulation zone , whose depth distribution ranges from the sea level to 60m ;

2002年12月~2003年10月分别在南京城区和市郊采集大气细颗粒物（PM2.5）样品，用XRF-9800型荧光分析仪分析，得到17种化学元素的含量。

The atmospheric fine particle ( PM2.5 ) samples were collected from December 2002 to October 2003 in Nanjing urban and suburban areas respectively . The contents of 17 kinds of chemical elements were obtained with analysis using the XRF-9800 fluorescent analysis instrument .

人体由多种化学元素组成。

The human body consists of many kinds of chemical elements .

磷块岩含化学元素22～24种。

22 ~ 24 chemical elements in phosphate rock are presented .

化学元素的地球丰度

Chemical element abundances in the earth and it 's major shells

《化学元素发现史》的张资珙译本试析

Tentative Analysis on Discovery of the Elements Translated by Chang Tzu-kung