放射性

Any of a group of five chemically related nonmetallic elements including fluorine,chlorine,bromine,iodine,and astatine.

锕类任何化学性质相似，原子序数在89与103之间变化的放射性元素

N-succinimidyl 5---3-pyridinecarboxylate, a useful linker for labeling proteins with astatine and iodine radioisotopes, is synthesized in three steps with 5- bromonicotinic acid as a starting material, and is characterized by nuclear magnetic resonance, mass spectrometer and high performance liquid chromatography.

以5-溴烟酸为起始物，通过3步主要反应合成了一种适用于蛋白质放射性砹标记的偶联剂——5--3-吡啶甲酸 N-琥珀酰亚胺酯，并用核磁共振、质谱、高效液相色谱等进行了表征。

This suggests that astrocyte plays an important role in cure of clinical radiation injury.

研究Ast在辐射损伤中的作用对于临床放射性脑损伤的治疗有着重要的意义。

Any element having an atomic number greater than 92; all are radioactive.

原子序数在以后的元素，都是放射性元素。

Some of the atomic nucleus is unstable and can spontaneously emit radiation, which has called the nature of the radioactive radiation.

有些原子核是不稳定的，能自发地放出射线，这种具有放射线的性质叫做放射性。

The heavy elements in the theory of spontaneous metamorphosis immediate sensation around the world ;(4) is proposed to estimate the Earth's radiation age;(5) from the charge-mass ratio α which is derived helium ions;(6) from the scattering of α Bighorn recognized atomic mass concentrated in a radius of 10-12 meters in the nuclear, on positively charged core surrounded by negatively charged electrons;(7) with natural α-particles from the nitrogen nuclei in the outgoing protons, this is the first time human beings to change the chemical elements of artificial nuclear reactions;(8) predicted that heavy hydrogen and neutron sub-existence .

这一重元素自发蜕变理论立即轰动全世界；（4）提出用放射性估算地球年龄；（5）从α的荷质比得出它是氦离子；（6）从α大角散射认识到原子质量集中在半径为10－12米的核上，核带正电，周围是带负电的电子；（7）用天然α粒子从氮原子核中打出质子，这是人类第一次实现改变化学元素的人工核反应；（8）预言重氢子和中子存在。

Radioactive material, Briefcases and attache case with installed alarm devices.

放射性物质、装有警报装置的手提箱和公事包。

Cortico cerebral response audiometer; cerebral cortex response audiometer

大脑放射性电子诊断；大脑活动的电子诊断

From analyzing the picture of autoradiograph of developing leaf,acceleration of leaf growth and development under elevated CO_2 was furthersupported.

利用~(14)C-蔗糖饲喂方法并结合放射自显影及放射性同位素检测技术对CO_2浓度升高影响叶片转运蔗糖方式和过程进行研究。

Studies on micronucleus formation by autoradiography and microscopy .

微核形成的放射性自显影和显微形态学研究。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。