In vivo electrochemical demonstration of potassium-evoked monoamine release from rat cerebellum

In vivo electrochemical methods were employed to study the potassium (K⁺-evoked release of monoamines from the cerebellum of the chloral hydrate anesthetized rat. K⁺-evoked releases were elicited using micropipette-Nafion-coated graphite epoxy electrode arrays in the granule/Purkenje cell layer, molecular layer, and white matter. These recorded releases were generally found to be reversible, moderately dose-dependent, and reproducible. However, the temporal dynamics of the releases were different for the cell layer versus molecular layer records. Releases were infrequently observed in cerebellar white matter, an area which is relatively devoid of monoamine containing terminals. The signals recorded from the cell and molecular layers were significantly attenuated by pretreatment with nomifensine, a potent catecholamine reuptake blocker, significantly prolonged the K⁺-evoked signals observed in both the granule/Purkenje cell and molecular layers. These data, taken together with earlier reports on the electrophysiological responses to activation of cerebellar noradrenergic inputs, support the conjecture that in vivo electrochemical recording methods have the sensitivity and spatial resolution for studies of functional monoamine release from brain regions that have a diffuse or laminated monoamine innervation.     

金属基底上聚合吡咯的电化学及电镜表征

用循环伏安法研究了吡咯在不同金属基底不同支持电解质中的聚合过程，对不同基底上制备的聚吡咯膜进行了电化学、扫描电镜、表面能谱等方面的研究，考察了聚吡咯膜电极对ＮＯ_３－离子的电位响应情况，结果表明，不同基底不同支持电解质在不同的吡咯浓度中表现出各异的伏安行为，经电化学处理的聚吡咯膜电极均对ＮＯ_３－呈Ｎｅｒｎｓｔ响应，扫描电镜观察表明除Ｐｔ基底外在其它基底上制备的聚吡咯膜均呈颗粒性球状堆集。     

电化学人工龋的电化学腐蚀机制研究

目的 研究电化学人工龋的电化学腐蚀机制。方法 采用循环伏安法研究牙片电极在K2SO4溶液中的氧化还原反应；以失重法并结合SPSS统计软件统计分析，评价牙片在KCl和K2SO4介质中恒电位腐蚀情况，并现场监测电解液氢离子浓度的变化情况。结果 在0.0-2.5V电位范围内，牙片电极与石墨电极具有波形类似的循环伏安曲线；在KCl和K2SO4介质中牙片的腐蚀速度无显著差异；2.0V恒电位腐蚀牙片8h后，阳极池本体溶液pH值由7.0平均下降到3.87，阴极池则由7.0平均升高到10.65。结论 在外电场作用下，牙片的阳极腐蚀与介质无关；水的阳极氧化引起阳极区氢离子浓度升高，致使牙齿发生酸溶是电化学人工龋形成的主要决定因素。     

Functional Thin Polymer Films at High Pressure

Summary: A new thin‐film characterization setup was created based on the combination of a surface plasmon spectrometer with an electrochemical cell operated under high pressure of up to 200 MPa and at temperatures up to 120 °C. The examples given to document its performance include photoisomerization studies with poly(methyl methacrylate) (PMMA) films partly derivatized with disperse red (DR1), as well as, a preliminary account of the electropolymerization of EDOT under pressure and the assessment of the redox properties of the resulting thin PEDOT films.

Sketch of the high‐pressure electrochemistry surface plasmon cell.     

一磺酸基酞菁锌和四磺酸基酞菁锌的分离及在水溶液中的 …

目的 分离一磺酸基酞菁锌（ＺｎＰｃＳ）和四磺酸基酞菁锌（ＺｎＰｃＳ４）,并研究这两种配合物在水溶液中伏安行为。方法 采用高效液色谱分离纯化ＺｎＰｃＳ和ＺｎＰｃＳ４,应用三电极系统测定其在水溶液中伏安曲线,测定ＺｎＰｃＳ４在不同ｐＨ值下和红光照射下的循环伏安曲线。结果 在水溶液中（ｐＨ７．０）,这两种配合物均呈现二个不可逆的单电子还原电流峰,峰Ⅰ的峰电位（Ｅｐ）是＋０．１８Ｖ,峰Ⅱ的峰位置（Ｅｐ）－     

电化学疗法治疗中晚期食管癌和贲门癌42例

目的探讨应用电化学疗法治疗中晚期食管癌和贲门癌的临床疗效。方法电化学疗法治疗中晚期食管癌和贲门癌４２例,对其治疗前后的疗效进行比较。结果通过对比电化学治疗前后食管Ｘ线钡餐检查及进食改善情况显示,８８％的患者在接受电化学治疗后进食明显改善,８９％的患者食管狭窄扩大在０．５ｃｍ以上。结论电化学疗法治疗食管癌和贲门癌解除食管梗阻见效快,疗效显著,能恢复患者饮食,可为实施其他治疗创造条件,使其远期生存率提高。     

微弧氧化技术与钛合金表面成骨细胞增殖及骨向分化能力

文题释义：微弧氧化技术：是金属材料表面处理的一种技术，将金属材料(如，镁、铝、钛等)置于特定电解液中，通过弧光放电过程中瞬时的高温和高压条件产生结合于金属表面的陶瓷膜层，该种方法制备的涂层材料具有高硬度、耐磨的特点。  种植体：是针对于人体自身牙齿缺失而植入上下颌骨内的人工牙根。性能优良的种植体需要同时具备高强度、耐降解、生物相容性好的特性。目前复合材料类如金属表面添加陶瓷涂层材料，具有上述多种材料特性而被临床选择。 背景：采用普通电化学法可在钛及其合金表面制备纳米级羟基磷灰石涂层，但该涂层吸收降解缓慢，需要8-12周的时间。而微弧氧化可在复杂表面形成均匀薄膜，有利于细胞黏附和骨组织长入。 目的：探索微弧氧化羟基磷灰石涂层钛合金对成骨细胞增殖及骨向分化能力的影响。 方法：采用电化学法与微弧氧化法分别制备羟基磷灰石涂层钛合金材料，检测两种材料表面的接触角。将成骨细胞系hFOB1.19接种于两组羟基磷灰石涂层钛合金材料表面，培养48 h时，采用扫描电镜观察细胞在材料上的形态变化；培养1，12，24，48，72 h时，采用MTT法检测细胞增殖；培养1，3，5 d时，比较两组材料表面细胞计数与碱性磷酸活性；培养第5天，采用Western Blotting检测细胞内骨形态发生蛋白2和骨形态发生蛋白4表达。 结果与结论：①微弧氧化组材料表面的接触角小于电化学组[(66.5±2.2)°，(52.8±2.1)°，P=0.001 5)]；②扫描电镜显示，电化学组成骨细胞形态不规则，胞体皱缩不饱满，与材料贴合较差；微弧氧化组细胞充分伸展，形态扁平，与材料贴合紧密；③微弧氧化组12-72 h的细胞增殖快于电化学组(P < 0.05)，培养3，5 d的细胞计数多于电化学组(P < 0.05)；④微弧氧化组培养1，3，5 d的细胞碱性磷酸酶活性高于电化学组(P < 0.05)；⑤微弧氧化组骨形态发生蛋白2和骨形态发生蛋白4表达均高于电化学组(P < 0.05)；⑥结果表明，微弧氧化羟基磷灰石涂层钛合金材料可促进成骨细胞的增殖及骨向分化能力。 ORCID: 0000-0003-2787-4667(王艳玲) 中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程     

基于石墨烯-依来铬青蓝R的新型免标记电化学免疫传感器用于CA19-9检测

目的构建石墨烯-依来铬青蓝R(GO-ECR)免标记电化学免疫传感器高灵敏检测CA19-9的新技术。方法化学法合成氧化石墨烯并滴涂于电极表面,通过循环伏安法电沉积制作GO-ECR修饰玻碳电极,在偶联剂EDC和NHS作用下以共价键合方式将CA19-9抗体固定于修饰电极表面,固定的抗体与CA19-9发生免疫反应形成抗原-抗体复合物。铁氰化钾溶液作为检测探针,对比免疫反应前后铁氰化钾响应信号的差异,利用信号降低程度与CA19-9浓度正相关,实现对CA19-9的特异性高灵敏检测。结果该电化学免疫传感器检测CA19-9的线性范围为0.05～500 U/mL,检测限为0.01 U/mL,且能准确测定临床血清样本CA19-9的浓度。结论构建的GO-ECR免标记电化学免疫传感器可以简单、准确、特异地检测CA19-9。     

The Implication of 1,3‐Dipolar Cycloaddition of Azomethine Ylides to the Synthesis of Main‐Chain Porphyrin Oligomers

The polycycloaddition of azomethine ylides to dipolarophiles is described for the first time. Use of (cis,cis)‐bis‐aziridines as a source of azomethine ylides allows selective polyaddition to be realized, which leads to oligomers exclusively with trans‐substituted pyrrolidine rings and modest molecular weights (ca. 5–10 kDa). The fluorescent, electrochemical, electrochromic, and non‐linear optical properties of the main‐chain free‐base porphyrin oligomer, synthesized by the developed procedure, are studied. An enhancement of the optical power limiting effect in a porphyrin oligomer solution is registered against that of the monomer.