同位素

Oxygen and carbon isotope of the carbonate sediments separately indicate lake waterδ~(18)O andδ~(13)C_,δ~(18)O indicates the volume of the input water which is a good index of Lake water level changes;δ~(13)C_ indicates the degree of the exchange between the lake and the atmosphere and indirectly indicates the ice cover time controlled by the temperature.3. Environmental changes in Lake Sugan drainage area during the past 2670 years reconstructed by mul-index synthesis analysis indicates that during

沉积物碳酸盐氧、碳同位素分别反应了湖水的δ~(18)O和δ~(13)C_，δ~(18)O指示湖水体积变化，是湖泊水位变化的良好指标；δ~(13)C_则指示了湖水和大气的交换程度以及入流水量的大小，间接指示了温度控制下的冰封时间长短。3、多指标综合分析重建的苏干湖流域晚全新世近2670年来的环境变化显示，苏干湖2670年来流域持续变干；出现截然不同的两个大的阶段，即

Influenced by the exterior source input of the detrital matters, U-series dating using aragonite is not suitable to the study of Lake Sugan sediment and a further study is required.2. The isotopes study of precipitation-groundwater-lake water system in Lake Sugan drainage area indicates that in modern climate system, the precipitation in Lake Sugan drainage area is mainly supplied by the water vapor carried by Westerly.

沉积物文石的铀系测年受到外源碎屑输入的影响，在苏干湖并不适用，需做进一步的研究。2、苏干湖流域降水-地下水-地表径流-湖水同位素系统研究表明，现代气候条件下苏干湖流域大气降水主要来源于西风环流携带的水汽输入。

Results: Mdroxyprogesterone acetate plus E2 (10-8 M) stimulated both the mRNA levels and activities of sulfatase (at 10-8-10-6 M) compared to E2 only.

用同位素标记的底物和RT-PCR技术分别测定硫酸酯酶和硫转移酶的活性和mRNA表达水平。

In addition, Cd and Tl are the potential toxic elements in the supergene environment; therefore, their isotopic composition could be used to trace the source of contamination.

另外，Cd，Tl是环境污染的主要潜在元素，因此采用稳定同位素示踪还可能示踪表生环境中的污染来源。

Based on hydrochemistry, REE, carbon and oxygen isotope analyzing, possible leakage way of the Air-Cushioned Surge Chamber is studied in the Xiaotiandu power-station.

摘要利用水化学、稀土元素和碳氧同位素的分析方法探讨了小天都电站调压室可能的渗水途径。

Trace element ; Sr- Nd isotope ; alkali syenite ; geodynamics ; Guangdong Province

微量元素； Sr-Nd同位素；碱性正长岩；地球动力学；广东省

Petrochemistry, trace element, REE and isotope geochemistry of quartz syenite porphyry, quartz diorite porphyry, rhyolite, and biotite granite indicate that they belong to series Ⅱ granite defined by Wangliankui (l972), but they have some characteristics of series Igranite, which shows adding of recycle upper-crust materials.

岩浆岩岩石化学、微量元素、稀土元素及同位素地球化学特征表明，莲花山矿区的石英正长斑岩、石英闪长玢岩、流纹岩和黑云母花岗岩属于王联魁(1972)所划分的系列Ⅱ花岗岩(相当于Ⅰ型磁铁矿系列花岗岩)，但也具有系列Ⅰ花岗岩的某些地球化学特征，表明岩浆中有再循环上地壳物质的加入。

It is thus concluded that Late Cretaceous salts deposited in Kashi depression of southwestem Tarim basin are close to the marine type, and the sedimentary stage is somwhat later than other regions. Therefore, Kashi depression should be regarded as a promising area in prospecting for sylvinite deposits.

应用这两个同位素新指标分析，塔里木盆地西部喀什次级构造凹陷晚白垩世盐岩沉积接近海相沉积类型，而且岩盐沉积阶段较晚，是一最有利成钾远景区。

Nd-Sr isotopic compositions for 20 granitoid bodies of syntexis series in South China have been studied in this paper.

本文讨论了华南20个同熔系列花岗岩类的Nd-Sr同位素组成。

Based on the isotopic compositions of samples and their distribution characteristics on the _-T,~(87Sr/~(86)Sr_i-T, and _-_ diagrams, these granitoids of syntexis series are considered as mixing products of upper crust end-member and depleted mantle end-member in certain proportion.

根据样品的同位素组成及其在￠Nd-T，(87Sr/86Sr)i-T和￠Nd-￠Sr图上的分布特征，认为这些同熔系列花岗岩类是华南上地壳端员和亏损地幔端员按一定比例混合的产物。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。