同位素

Piperidine oxoammonium salts oxidize aromatic amines and N, S-containing heterocycles to the corresponding radical cations, and the isotope effects in electron transfer reactions between thianthrene and N-methylphenothiazine radical cations and their respective neutral parent molecules have been reported for the first time.

啶氧铵盐氧化芳95胺和含氮、硫芳杂环为相应的自由基正离子，首次报道了及甲基吩自由基正离子与其中性母体之间电子转移的同位素效应。

Piperidine oxoammonium salts oxidize aromatic amines and N, S-containing heterocycles to the corresponding radical cations, and the isotope effects in electron transfer reactions between thianthrene and N-methylphenothiazine radical cations and their respective neutral parent molecules have been reported for the first time.

哌啶氧铵盐氧化芳香胺和含氮、硫芳杂环为相应的自由基正离子，首次报道了噻蒽及甲基吩噻嗪自由基正离子与其中性母体之间电子转移的同位素效应。

Trachyte has as the same isotope feature as the basalts, indicating that they were derived from the same source, and resulted from products during different evolution phases of the same magma source, which is similar to that of the basalts in Emeishan.

该区粗面岩类与玄武岩的同位素特征类似，说明二者具有相同的源区，并可能代表了同源岩浆不同演化阶段的的产物，这与峨眉山地幔柱岩浆活动的玄武岩与粗面岩所具有的演化关系相同。

Rats were sacrificed at 0, 6, 12, 24 and 48 hours after reproduction of pancreatitis in both groups. The intestinal mucosal permeability was assessed with 99mTechnetium Diethlene Triamine Pentacetic Acid method, and the expression of substance P was evaluated with reverse transcriptase polymerase chain reaction and Western blotting analysis.

分别于制模成功后0、6、12、24和48 h处死两组大鼠，并留取标本；利用同位素法测定肠黏膜通透性，分别用逆转录-聚合酶链反应和蛋白质免疫印迹法检测P物质在肠组织中的mRNA和蛋白表达水平。

In the postnatal period these cases were managed conservatively and followed by renal echogram and Tc-99m diethylene triamine penta-acetic acid diuretic renal scan as needed. Four of these six units (66.7%) resolved spontaneously within 1 to 6 months. The other two lesions deteriorated within 6 months and surgical intervention was required.

吾人采保守性疗法，而以肾脏超音波或同位素利尿剂肾脏摄影检查来追踪这些病例；其中四个肾脏病变於六个月之内自行恢复正常，另两个肾脏病变则於六个月之内渐渐恶化，最后接受了外科的矫正治疗。

Based on the regional tectonic evolution, combined with the high precision isotopic ages from this paper and other geologists, we have some new acquaintances as follows: 1 There has no Caledonian granite belt distributed in north margin of North China Craton. So, the traditional evolving model of North China Carton, which formed on this idea and the acquaintance about the collision of North China plate and Siberian plate, must be incorrect; 2 The age date show that the earliest magmatic activity began since late-Palaeozoic Permian, which is inconsistent with the previous idea that there were Caledonian and Hercynian active continental margin in the north of North China Craton and in the south Xingkai Massif. 3 the crust and lithosphere were thickened by the subduction and collision of Siberia plate and North China plate during Late Paleozoic. The magma is formed when the crust is heated and melts caused by thickened lithosphere delamination and caused the Asthenosphere upwelling. But only a little basaltic magma erupted, most magma underplate under the bottom of the crust. Thermal energy derived from basaltic magma underplating made the middle and lower crust melt partially and the late Permian-early Triassic granites is formed in large scale.

根据区域构造演化分析，并结合本文及他人高精度同位素年龄，我们对延边花岗岩形成的大地构造环境有了新的认识：1在华北地台北缘并不存在所谓的加里东花岗岩带，因此，建立在此之上的传统的华北地台北缘演化模式及有关西伯利亚板块与华北板块的碰撞拼合的认识也必然是不正确的；2华北地台北缘和兴凯地块南缘不存在加里东期和海西期花岗岩带，表明两地块边缘最早的花岗质岩浆活动始于晚古生代的二叠纪，即不存在传统观点所认为的加里东期或海西期活动陆缘；3晚古生代由于西伯利亚板块与华北板块的俯冲碰撞，致使地壳和岩石圈增厚，导致加厚岩石圈发生拆沉作用，使得软流圈上涌，加热地壳使之熔融形成岩浆，但玄武质岩浆少量喷出地表，大部分底侵于地壳底部，形成下地壳高密度的玄武质底侵层，玄武质岩浆底侵的热能引起中下地壳广泛部分熔融，形成大面积分布的晚二叠世—早三叠世花岗岩。

So brachiopods as indicators of original isotopic compositions of marine limestones is undoubtful.

因此从本论文的研究看，腕足化石作为碳酸盐岩原始氧、碳同位素研究的较为理想的样品不应受到怀疑。

HackerBR%Ratschbacher L%Webb L Exhumation of ultrahigh- pressure continental crust in east central China: Late Triassic- Early Jurassic tectonic unroofing 10.1029/2000JB900039 Journal of Geophysical Research , 2000,105

李曙光%Hart S R%郑双根中国华北华南陆块碰撞时代的钐-钕同位素年龄证据中国科学B辑， 1989，3

Ammonium bicarbonate, still being one of the main nitrogen fertilizers at present time in China, is easily volatilizable in soils.

通过盆栽试验和田间N~(15)同位素试验，研究了碳铵粒肥在水田深施的氮素供应状况。

Dr Whiteside found the ratio yawed around like a drunken sailor as the continents split apart and the lava started pouring out.

怀特塞德博士发现在大陆断裂、熔岩开始喷发时，同位素的比率就如醉酒的水手一般摇晃不定。

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。