同位素

By using the "mechanical wounding"experimental system estabilished by us, and light- and electron microscopy, autoradiography and radioisotope technique, immuno-fluorescence localization, homologous clone and RACE technique, in situ mRNA hybridization and ELISA et al., we investigated the relationship between the transportation of exogenous JA and the secondary laticifer differentiation, the relationship between the producton and accumulation of endogenous JA and the laticifer differentiation from cambia, and the effect of appling exogenous jasmonates on the natural rubber production.

利用我们建立的机械伤害诱导乳管分化的实验系统，采用光学显微镜和电子显微镜技术、同位素示踪和放射自显影技术、免疫荧光定位技术、同源克隆和RACE技术、mRNA原位杂交和ELISA等技术，研究了外源茉莉酸在橡胶树体内的移动及其对维管形成层分化次生乳管的诱导效应、内源茉莉酸与乳管分化的关系以及茉莉酸类物质对天然橡胶产量的影响。

The chemistry of CAPAs was almostunexplored since it was proposed in a prebiotic reaction of inorganic polyphosphates with amino acids.

自CAPA的结构被提出以来，CAPAs的化学反应几乎没有得到进一步的研究，所以本论文的第二章研究了以甘氨酸-CAPA和丙氨酸-CAPA为代表α-CAPAs分子，通过同位素标记实验~(18O，~(15)N证明了CAPA分子具有两个亲电中心。

In chapter 2,the bi-electrophilicity ofα-CAPAs(Gly-CAPA,Ala-CAPA) was identified by the isotope analysis ~(18O,~(15)N and furtherproved by trappingα-CAPA with nucleophiles such as water,amino acids,phosphateand methanol in alkaline media which yielded phosphorylated products,namely,theNPAAs and N-(mono-substituted)phosphoryl amino acids.

自CAPA的结构被提出以来，CAPAs的化学反应几乎没有得到进一步的研究，所以本论文的第二章研究了以甘氨酸-CAPA和丙氨酸-CAPA为代表α-CAPAs分子，通过同位素标记实验~(18O，~(15)N证明了CAPA分子具有两个亲电中心。

Looking at these isotopes allows the chondrules to be dated, and they were formed 4.56 billion years ago.

观察这些同位素可以估算出陨石球粒的年龄，他们是在45.6亿年前形成的。

Short-lived radionuclides and long-lived isotope systems are normally used to date chondrites; the former systems can provide only relative ages while the later can provide absolute formation ages of chondrules, in contrast.

陨石年代学研究中常用定年工具包括短半衰期和长半衰期放射性同位素体系，其中前者可以给出陨石形成的相对年龄，而后者则可以给出绝对形成年龄。

The isotopic abundances of rare gases and cosmic-ray exposure ages of asteroid meteorites, planetary meteorites and the Apollo lunar samples applied to clue up and understanding cosmic-ray exposure history of parent bodies of different meteorite types, collision events, the relationship between cosmic-ray exposure ages and heliocentric distance of the parent bodies, irradiation history of precompaction exposure of chondrules, pairing meteorites for the Antarctic meteorites and desert meteorites, the ejection history of planetary meteorites, and relative ages of lunar craters and so on.

小行星陨石、行星陨石及阿波罗月球样品的稀有气体同位素丰度和宇宙射线暴露年龄，已广泛应用于探索和了解不同类型陨石母体的宇宙射线暴露历史、冲击碰撞事件、暴露年龄与日心距离的关系、吸积形成母体前硅酸盐球粒的辐照历史、南极和沙漠陨石中成对陨石的判别、行星陨石的溅射历史及月坑的相对年龄等关键词：宇宙射线暴露年龄；陨石；球粒陨石；无球粒陨石；火星陨石；中铁陨石

On the basis of stripping principle, the mathematical model of removal of tiny moisture in the complexing agent was established, and the solution of this model was carried on by using the software of Matlab.

针对在硼同位素的分离过程中，由于三氟化硼的特殊性质，必须对整个系统的水质量浓度进行控制，而系统中的微量水主要由络合剂引入的问题，根据汽提原理，对络合剂中的微量水份脱除建立数学模型，并利用Matlab软件对此模型进行求解。

A team led by Stanford University scientists reconstructed dietary sources of recent and ancient condors by measuring carbon and nitrogen isotope concentrations in feather and bone remains.

由史丹佛大学科学家所率领的小组，测量了秃鹰遗骸的羽毛及骨骼中，碳及氮同位素的浓度，而重建了古今秃鹰的食物来源。

The development of cryostats of this kind requires detailed data tables or equations for the thermodynamic properties of 3 He over a wide range of parameters-temperature and pressure.

1介绍液态和气态氦的两种同位素(4He和3He)是获得极低温条件的必要制冷剂，拥有宽温度和压力范围内3He的详细热力参数数据对进行极低温基础科学研究和制冷特性研究是至关重要的。

Today, most cyclotrons are used either for instructional purpose or for isotope production

今天大多数回旋加速器是用在教学上，或者用于同位素生产。

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。