D_2EHDTPA萃取铟的热力学研究

报道了用二 (2 乙基己基 )二硫代磷酸为萃取剂 ,以正庚烷为稀释剂萃取铟的热力学研究。在In2 (SO4 ) 3+Na2 SO4 +D2 EHDTPA +n C7H1 6 +H2 O体系中 ,在温度 2 78.15～ 3 0 3 .15K和离子强度 0 .1～ 2 .0mol·kg- 1 范围内 ,以Na2 SO4 为支持电解质 ,测定了萃取平衡水相中In3+浓度和pH值。计算了萃取反应的标准平衡常数K0 ,并得到经验公式logK0 =43 .93 -5 3 68.5 4 T -0 .0 699T ,同时计算了萃取反应的其他热力学量 ,并指出了焓和熵都是此萃取过程的推动力     

准分子激光泵浦的皮秒染料激光器

利用准分子激光泵浦猝灭式染料激光器，获得了３０ｐｓ的可调谐染料激光脉冲输出。     

多层气敏薄膜表面吸附及界面扩散的研究

制备了ＳｎＯ３／ＺｎＯ及ＺｎＯ／ＳｎＯ３多层结构的气敏薄膜，用能谱结合氩离子刻蚀的方法及Ｘ射线衍射法，对薄膜的表面吸附。膜间的相互与组成等进行了研究，结果表明：薄膜表面存在少量的吸附多层膜中锌的扩散远比锡一个模型，对吸附现象作了初步的解释，讨论了造成锌锡扩散的原因。     

GaAs FET辐射退化研究

低噪声ＧａＡｓ ＦＥＴ和功率ＧａＡｓ ＦＥＴ经中子辐射都未发生致命性的通或断失效，直流偏置伏态下，其失效模式仅仅表现为源漏饱和电流ＩＤＳＳ的退化降低，据此提出了ＩＤＳＳ退化失效与快中子注量φｎ之间的解析关键式ｌｎｙ＝ａ＋ｂｌｎφ。     

统筹城乡发展全面推进城乡一体化

两年前,义乌市委、市政府认真贯彻党的十六大精神,顺应广大群众的呼声,按照统筹城乡发展的思路,编制了《义乌市城乡一体化行动纲要》,在全市全面部署开展城乡一体化行动,已取得初步成效,赢得了社会各界的赞誉。     

N-Methyl-D-aspartate attenuates opioid receptor-mediated G protein activation and this process involves protein kinase C

The effects of N-methyl-D-aspartate (NMDA) on opioid receptor-mediated G protein activation were explored in neuroblastoma X glioma hybrid (NG108-15) cells. Treatment of the cells with NMDA resulted in a remarkable attenuation of [35S]guanosine-5'-O-(3-thio)triphosphate binding stimulated by [D-Pen2,D-Pen5]-enkephalin (DPDPE), a delta-opioid receptor agonist. The effects of NMDA were dose and time dependent with an IC50 value of 5 nM and could be blocked by NMDA receptor antagonists. After NMDA treatment, the DPDPE dose-response curve shifted to the right (EC50 value increased approximately 7-fold, from 6 to 40 nM), and the maximal response induced by DPDPE was reduced by approximately 60%. The effects of NMDA were reversible, and the DPDPE response could recover within 60 min. The functional responses of delta-, mu-, and kappa-opioid receptors in primarily cultured neurons also were attenuated significantly by NMDA treatment. The inhibitory effects of NMDA on opioid receptor-mediated G protein activation could be blocked by coadministration of the protein kinase C (PKC) inhibitors or by elimination of the extracellular Ca2+. Correspondingly, NMDA treatment of NG108 cells significantly elevated cellular PKC activity and stimulated Gialpha2 phosphorylation. Transient transfection into NG108-15 cells of the wild-type Gialpha2 and a mutated Gialpha2 (Ser144Ala) resulted in a 2-fold increase in DPDPE-stimulated G protein activation. The DPDPE responses were greatly inhibited by NMDA treatment in the wild-type Gialpha2-transfected cells but much less affected in the mutant Gialpha2-transfected cells. In summary, NMDA attenuates opioid receptor/G protein coupling, and this process requires activation of PKC.     

MCS接枝共聚物的结构和形态

将甲基丙烯酸甲酯（ＭＭＡ）、苯乙烯（Ｓ）在氯化聚乙烯（ＣＰＥ）存在下进行悬浮接枝共聚，获得ＭＣＳ树脂。本文着重考察了ＭＣＳ树脂的化学结构及胶粒形态。结果表明，确实发生了接枝共聚。ＣＰＥ用量、ＲＳＨ含量、引发剂浓度、反应温度、溶胀时间及聚合转化率对ＭＣＳ树脂的接枝率、接枝效率均有影响。ＭＣＳ树脂是接枝共聚物、ＭＭＡ／Ｓ共聚物与ＭＭＡ均聚物的混合物，橡胶相ＣＰＥ在ＭＣＳ树脂中的分散情况为“海岛结构”，