放射化学

The elution yield of 188 Re is more than 70 % during a period of three months.

188Re的淋洗效率在 3个月之内大于 70 %，188W的漏穿率小于 10 - 4%，核纯度和放射化学纯度均大于 99%。

According to the electrophilic substitution of α-Allocryptopin by ICl, it can be suggested that there are competitions of n-donors (such as N and O atom occurred in alkaloid or solvent molecules) with the conjugated π system in alkaloid molecule for iodine monochloride when charge-transfer complexes are formed, which may block the formation of pre-reactive π-complex intermediate, and thus suppress the electrophilic substitution.

这一方法标记过程简便，标记产物富集于有机相，易于进一步纯化，其放射化学纯度接近95%，标记率超过70%；ICl与α-别隐品碱的亲电碘化反应结果表明，生物碱底物或溶剂分子中的N、O等n电子给体可能与亲电试剂形成电荷转移络合物，竞争芳香亲电取代反应π络合物反应前体的形成，从而抑制碘化反应的发生。

The School of Biology and Biochemistry is primarily dedicated to teaching and research in biology and biochemistry including peptide and protein chemistry, nucleic acid radiation chemistry, parasitology, neuroscience, plant and fungal physiology, marine and coastal studies, ecology and behaviour, experimental phycology, fish genetics, molecular virology, cell genetics and microbiological transformation.

该学院主要致力于生物学与生物化学的教学与研究，其学科领域包？？？肽类和蛋白质化学、核酸放射化学、寄生虫学、神经科学、植物和真菌生理学、海洋和海岸研究、生态？？？和？？？？？为学、实验藻类学、细胞遗传学与微生物转化。

Protactinium was radiochemically separated from the irradiated targets.

用放射化学方法从被照射的靶中分离出镤。

An introduction to environmental level of transuranium elements and a review of the recent advance in radiochemical analyses of them are made.

本文介绍了超铀元素的环境水平，对它们的放射化学分析的进展进行了述评。

The synthesis was typically finished in less than 50 min with overall radiochemical yields of 20%-30% and radiochemical purity more than 98%.

总合成时间约为50min，放射化学产率为20％-30％，放射化学纯度大于98％。

Results The corrected radiochemical yield was about 54%, and the chemical and radiochemical purity was above 95% by high-performance liguid chromatograph...

结果放射化学产率约为54％，用TLC法和HPLC法测定化学纯度均大于99％，放化纯度均大于95％，18F－FDG各项质量控制指标符合药典要求。

Gas chromatography is an important tool for rapid c hemical separations in nuclear and Radiochemistry.

在核化学与放射化学研究中，气相色谱法是一种非常重要的快速分离工具。

Many industrial multi-versities and specialist colleges have been established, strengthening some incomplete subjects and establishing new specialties, e.g., automation, atomic energy, energy resources, oceanography, nuclear physics, computer science, polymer chemistry, polymer physics, radiochemistry, physical chemistry and biophysics.

新建了一批多科性工业大学和多种专门学院，充实和组建了一些缺门学科和新的专业，如理工方面的自动化、原子能、能源、海洋、核物理、电子计算机、高分子化学与高分子物理、放射化学、物理化学和生物物理等。

The juvenile hormones structure, synthesis site and physiological functions of Haemaphysalis longicornis were investigated using tissue culture, biochemistry, RCA, LSS, GC and GC/MS.

运用组织培养、生物化学、放射化学分析、液闪和气相色谱/质谱技术对长角血蜱保幼激素化学结构、合成位点和生理功能进行了研究。

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％。