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设计了适于激光诱导光声流动检测的毛细管流动池,讨论了池的特点及其在分析化学中的应用,用该池检测Co~(2+),检测限相当于2×10~(-6)cm~(-1)光吸收。 相似文献
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HE Qiange CHEN Xiangji MIAO Yubin & LIU Boli Chemistry Department Beijing Normal University Beijing China 《中国科学B辑(英文版)》2004,47(6):499-506
Quantification of regional cerebral blood flow(rCBF) plays an important role in the diagnosis ofvarious cerebrovascular and neurological diseases. Innuclear medicine, brain perfusion imaging can providesituation of whole or regional cerebral blood flowperfusion (CBF or rCBF) to neurologists, help to findabnormality of cerebral blood flow before cere-brovascular and neurological diseases induce patho-logical changes in configuration or structure of brain.They offer important information for … 相似文献
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For a weakly and periodically driven two-component Bose-Einstein condensate (BEC) the Melnikov chaotic solution and boundedness conditions are derived from a direct perturbation theory that leads to the chaotic regions in the parameter space. 相似文献
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苯酰胺类化合物是多巴胺D2受体的拮抗剂,它不仅与D2受体的亲和力高,而且产生的锥体外副反应极轻,是一类很有应用潜力的抗精神病药物.放射性同位素(123I等)标记的苯酰胺类化合物可作为多巴胺D2受体显像剂用于临床诊断疾病.近年来,相继报导了一系列高亲和力的该类化合物,其中,123IIBZM等已用于临床诊断疾病[1].本文在前文[2]苯酰胺类D2受体显像剂结构效应的研究基础上,利用SYBYL6.4软件,研究了该类化合物分子的不同构象以及空间结构与结合活性之间的关系,证实了前文提出的由于分子内氢键形成六元共平面假想A环、B环等是影响… 相似文献
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Wei Lei Fukui Shen Nianwei Chang Lin Niu Yuanyuan Hou Boli Zhang Min Jiang Gang Bai 《中国化学快报》2021,32(1):190-193
Atherosclerosis is a persistent inflammatory state,while vascular endothelial fibrosis is one of the primary causes of atherosclerosis development.Although ligustilide(Lig) was shown to exert obvious antiatherogenic effects in previous studies,its precise mechanism has not been deeply discussed.In this paper,we designed a Lig-derived photoaffinity labelling(PAL) probe to identify potential therapeutic targets of Lig via chemical proteomics approach.Mothers against decapentaplegic homologue 3(SMAD3),a signal transmitter of transforming growth factor-β(TGF-β) which promotes the development of vascular fibrosis,was identified as a potential target of Lig.Lig suppressed the phosphorylation and nuclear translocation of SMAD3 by blocking the interaction between SMAD3 and TGF-β receptor 1,thereby inhibiting the collagen synthesis process.Hence,developing a novel SMAD3 inhibitor may present a promising therapeutic option for preventing vascular fibrosis. 相似文献
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Syed Abdul Wadood Guo Boli Zhang Xiaowen Ali Raza Wei Yimin 《Journal of mass spectrometry : JMS》2020,55(1)
This study aimed to develop a potential analytical method to discriminate the Chinese winter wheat according to geographical origin and cultivars. A total of 90 wheat samples of 10 different wheat cultivars among three regions were examined by headspace solid phase microextraction coupled with gas chromatography‐mass spectrometry (GC‐MS). The peak areas of 32 main volatile compounds were selected and subjected to statistical analysis, which revealed significant differences among different regions and cultivars. Multivariate analysis of variance showed a significant influence of regions, wheat genotypes, and their interaction on the volatile composition of wheat. Principal component analysis of the aromatic profile showed better visualization for wheat geographical origins. Finally, a classification model based on the linear discriminant analysis was successfully constructed for the discrimination of regions and cultivars with the correct classification percentages of 90 and 100%, respectively. 相似文献
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基于鲁米诺-过氧化氢体系对邻氯代苯亚甲基丙二腈(CS)和丙二腈的化学发光的检测,考察了其反应动力学曲线,详细研究了pH值,鲁米诺浓度,过氧化氢浓度,本底信号的稳定性对化学发光强度的影响.CS的检测线性范围为10-2~10-5mol/L,绝对检测限为1.1ng(S/N=3/1).丙二腈的检测线性范围为10-3~10-6mol/L,绝对检测限为0.5ng(S/N=3/1).建立了鲁米诺-过氧化氢体系对液相化学发光对CS和丙二腈的分析方法,对CS的沙土样品进行测定,结果令人满意. 相似文献
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FAN Caiyun JIA Hongmei Deuther-Conrad Winnie Brust Peter Steinbach J?rg & LIU Boli . Key Laboratory of Radiopharmaceuticals 《中国科学B辑(英文版)》2006,(2)
Sigma (σ) receptors are a distinct class of proteinsexisting in at least two subtypes termed σ1 and σ2[1].They are expressed in the central nervous system, en-docrine, immune and certain peripheral tissues andmay play an important role in regulating an… 相似文献