Development of Electrochemical Biosensor for Detection of PML/RARα Fusion Gene in Acute Promyelocytic Leukemia

针对急性早幼粒细胞白血病(APl)中PMl/rArα融合基因的碱基序列,设计了锁核酸(lnA)修饰的发夹结构捕获探针,结合信号探针构建新型的“三明治“电化学传感模式。信号探针末端修饰的生物素可与酶上的亲和素结合,通过检测酶催化H2O2氧化底物3,3',5,5'-四甲基联苯胺(TMb)产生的电化学信号,实现对靶序列的检测。该传感器可识别和定量检测PbS缓冲液中人工合成的PMl/rArα融合基因序列。结果表明,该传感器能很好地区分互补序列、单碱基及多碱基错配序列,杂交电流值与目标链浓度在1.0x10-11~1.6x10-10 MOl/l范围内呈较好的线性关系,检出限为1.0x10-13 MOl/l。同时,该新型传感器成功地用于无稀释人血清中PMl/rArα融合基因的检测,具有特异性强、灵敏度高和重复性好的优点,有望用于临床实际样品的检测,进而实现临床上急性早幼粒细胞白血病的早期诊断及预后判断。A novel DNA electrochemical probe(locked nucleic acid,LNA) was designed and involved in constructing an electrochemical DNA biosensor for the detection of PML/RARα fusion gene in acute promyelocytic leukemia(APL).This biosensor was based on a "sandwich" detection strategy,which involved a pair of LNA probes,e.g.hairpin capture probe and reporter probe.Streptavidin-HRP was bound to biotin labeled at the end of reporter probe via streptavidin-biotin affinity binding.In the presence of hydrogen peroxide(H2O2),HRP catalyzed the oxidation of the substrate 3,3′,5,5′-tetramethylbenzidene(TMB) to offer an enzymatically amplified electrochemical current signal for the detection of target DNA.This sensor was applied in the direct quantitative detection of synthetic PML/RARα fusion gene in PBS buffer.The results indicated that the biosensor showed an excellent specificity to distinguish the complementary sequence and different mismatch sequences.A linear relationship between the amperometric signal and the target concentration was obtained in the range of 1.0×10-11-1.6×10-10 mol/L with a detection limit of 1.0×10-13 mol/L.In addition,the biosensor was used for the determination of PML/RARα fusion gene in human serum samples without dilution with high sensitivity,selectivity and good repeatability.This method would be expected to use in real sample for further solving the actural problems of early diagnosis and prognosis monitoring of APL.863计划资助项目(2008AA02Z433);福建省高校产学研科技重点项目(2010Y4003);国家自然科学基金资助项目(20805006;20975021);福建省自然科学基金资助项目(2010J05019

术前口服倍他乐克对于麻醉诱导丙泊酚的用量和血流动力学的影响

【目的】本研究探讨术前口服倍他乐克对麻醉诱导时丙泊酚的用量和血流动力学变化的影响。【方法】选择择期手术的全麻病人（ASAⅠ～Ⅱ）60例，随机分成两组，每组30例，第一组为实验组（B组），术前口服倍他乐克50mg，第二组为对照组（C组）给予安慰剂；以30mg·kg^-1·h^-1的恒速灌注丙泊酚至BIS达到50，记录病人入睡时和BIS=50时丙泊酚的用量以及插管前后血压、心率、中心静脉压和心输出量变化。【结果】两组病人入睡时丙泊酚的用量：B组是（1_35±0．22）mg·kg^-1；C组是（1．60±0．24）mg·kg^-1，组间差异P〈0．01；BIS=50时的丙泊酚的用量：B组是（1．71±0．27）mg·kg^-1；C组是（1．98±0．24）mg·kg^-1；组间差异P〈0．01；B组插管前、后血压和心率的变化程度较C组小（P〈0．05），插管过程中心静脉压和心输出量组间变化差异不大。【结论】术前口服倍他乐克50mg减少麻醉诱导丙泊酚的用量，插管时的血流动力学相对稳定

网络环境下的地理信息服务集成研究

从Web Services的角度,根据地理信息的特殊性,研究地理信息服务的实现方法和发布策略,实现了高效的地理信息服务集成方案。

Corrosion Inhibition of Self-assembled Films on Iron by Electrochemical Impedance Spectroscopy

在铁表面自组装十四烷基胺膜.研究该膜在0.5 mol/LH2SO4溶液中对铁的缓蚀性能.电化学阻抗谱测试表明,随着组装时间的延长,缓蚀性能也随之增强,最大缓蚀效率为68.7%.而以十二烷基硫醇和十四烷基胺修饰的混合膜则更为致密、稳定,对铁的缓蚀能力也明显优于仅以十二烷基硫醇或十四烷基胺修饰的单一膜,其缓蚀效率可提高至78.2%.The self-assembled films of tetradecylamine were formed on iron surface,and the inhibition ability of which for iron corrosion in 0.5 mol/L H2SO4 solutions was studied by electrochemical impedance spectroscopy technique.Results indicated that longer immersion time would result in stronger inhibition ability of the films.The maximal inhibition efficiency(IE) of the tetradecylamine films was 68.7%.When the tetradecylamine films were modified by dodecylthiol,the mixed films became denser and more stable,thus the inhibition ability increased remarkably.The η of the mixed films increased to 78.2%.作者联系地址：曲阜师范大学化学科学学院;山东大学化学与化工学院;Author's Address: 1.Department of Chemistry,Qufu Normal University,Qufu 273165,Shandong,China;2.School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,Shandong,China;3.School of Chemistry and Chemical Engineering,University of Jinan,Jinan 250022,Shandong,Chin

Application of smell identification test in Parkinson＇s disease in China

目的 建立我国嗅觉识别测验材料与方法，测查帕金森病患者的嗅觉功能，验证测验的有效性，分析其影响因素。方法 选取诊断明确的原发性非痴呆帕金森病患者55例以及与其人口学资料相匹配的健康对照55名作为研究对象，采用中国科学院心理研究所研发的基于中国人群的嗅觉识别测验方法，进行嗅觉识别测验。结果 帕金森病组嗅觉识别测验的正确选择数（19.3±5.4）显著少于健康对照组（26.5±5.7），差异有统计学意义（t＝-6.827，P〈0.01）；依据不同年龄段的参考值进行分段比较，发现63.6%的帕金森病患者存在显著嗅觉减退，Hoehn-Yahr分级2～3级显著嗅觉减退的发生率为77.8%；通过帕金森病组与健康对照组受试者工作特征（ROC）曲线分析显示，嗅觉识别测验正确识别数取界值为22.5时，诊断嗅觉减退的敏感度为74.6%，特异度为70.9%；帕金森病患者嗅觉识别测验正确数不受年龄、教育年限、Hoehn-Yahr分级、病程、统一帕金森病评定量表的第三部分得分、MMSE评分的影响（均P〉0.05）。结论 帕金森病患者存在嗅觉识别能力的减退，中国人群的嗅觉识别测验能够有效地测查帕金森病患者的嗅觉功能