电位滴定法测定苯磺酸左旋氨氯地平的含量

目的：建立测定苯磺酸左旋氨氯地平含量的新方法。方法：采用电位滴定法。结果：该法和国家标准规定的HPLC法测定结果一致。结论：所建方法简便，准确，适用于苯磺酸左旋氨氯地平的含量测定。     

电位滴定法测定安乃近片的含量

目的：建立安乃近片的含量测定方法。方法：以乙醇-0.01 mol/L盐酸溶液（1：1）为溶剂，用电位滴定法测定安乃近片的含量。结果：本法滴定终点突跃明显，重现性好（RSD=0.33%，n=6），平均回收率为99.44%。结论：试验表明该方法简便，快速，专属性强，准确可靠，适用于安乃近片含量的测定。     

电导滴定法测定水中溶解氧的研究

〔目的〕建立一种测定水中溶解氧的新方法。〔方法〕用盐酸标准溶液滴定金属铊与水中溶解氧反应的产物 ,以电导法指示滴定终点。〔结果〕相对标准偏差为 0 .3 8% -0 .97% ,相对误差为 -1.96% -1.85 %。〔结论〕本法准确度好 ,快捷灵敏 ,抗干扰能力强 ,是一种测定水中溶解氧的简便可靠的方法。     

乙醇氧化酶两点速率法测定血清微量乙醇

目的：建立一个灵敏、准确、特异、试剂稳定的乙醇氧化酶法用于测定血清微量乙醇浓度。方法：利用乙醇氧化酶与过氧化物酶偶联，通过优化反应体系及自动生化分析仪分析参数，采用两点速率法对乙醇进行分析。结果：乙醇浓度在2000mg／L以下线性良好；批内RSD小于2．81％，批间RSD小于4．51％；平均回收率为100．7％；本法（Y）与气相色谱法（X）比较具有良好的相关性，Y=0．996X＋3．58，r=0．981。胆红素159．1μmol／L、甘油三酯14．31mmol／L、血红蛋白5．8g／L以下对本法测定乙醇结果无干扰。结论：建立的两点速率法测定乙醇灵敏度高、准确度、特异性均较好，特别适合于血清乙醇浓度处于轻度超标的疑似酒后者的标本检测。     

正交试验法优选半夏有效部位的提取工艺

目的:研究半夏药材中总游离有机酸的最佳提取条件.方法:以电位滴定法为含量测定方法,采用重复-正交试验法,选择乙醇浓度(A)、提取时间(B)、溶剂量(C)、提取次数(D)4个因素,每个因素选取3个水平进行试验,最后确定提取工艺.结果:因素A、B、C、D均对总游离有机酸的含量有极显著的影响.结论:10倍量75%乙醇,加热回流提取2次,每次1 h为半夏中总游离有机酸的最佳提取条件.     

Study of the Adhesion of Neurodegenerative Proteins on Plasma-Modified and Coated Polypropylene Surfaces

Abstract

The inner polymeric surface of an ELISA titration well is plasma-modified and coated with different surfactant molecules. The titration of neurodegenerative proteins markers (prion, Tau and β-synuclein), previously demonstrated as more efficient with such modified tubes, is related to the adhesion behaviour of these proteins and their corresponding capture antibodies. The adhesion process is studied in terms of anchoring and specific mechanisms. The proteins and antibodies binding onto such modified surfaces is related to the substrate hydrophilic character calculated from the angle contact measure, to the polymer surface charge measured through the streaming potential determination at different pH and the inner surface roughness determined from AFM images. Furthermore, the influence of the blocking agent used during the ELISA titration is also studied.     

Automatic Methods for Carotid Contrast-Enhanced Ultrasound Imaging Quantification of Adventitial Vasa Vasorum

Adventitial vasa vasorum are physiologic microvessels that nourish artery walls. In the presence of cardiovascular risk factors, these microvessels proliferate abnormally. Studies have reported that they are the first stage of atheromatous disease. Contrast-enhanced ultrasound (CEUS) of the carotid allows direct, quantitative and non-invasive visualization of the adventitial vasa vasorum. Hence, the development of computer-assisted methods that speed image analysis and eliminate user subjectivity is important. We developed methods for automatic analyses and quantification of vasa vasorum neovascularization in CEUS and tested these methods in a cohort of 186 individuals, 63 of whom were healthy volunteers. We implemented alternative automatic strategies for using the images to stratify patients according to their risk group and compare the strategies with respect to diagnostic performance. An automatic single-parameter strategy performs less effectively than the corresponding Arcidiacono method based on manual interpretation of the images (68 < area under the receiver operating characteristic curve [AUROC] for the manual Arcidiacono method < 82; 60 < AUROC for the automatic single-parameter strategy < 63). However, by use of additional image parameters, an automatic multiparameter strategy has significantly improved performance with respect to the manual Arcidiacono method (78 < AUROC < 90). The automatic multiparameter strategy is a valuable alternative to the manual Arcidiacono method, improving both diagnostic speed and diagnostic accuracy.     

Zephyr5826起搏器心房自动阈值管理的临床观察

目的动态观察Zephyr5826起搏器心房自动阈值管理(ACM)功能的开启情况、准确性及安全性。方法选取置入Zephyr5826起搏器患者68例,于置入术后第1,7天及1,2,3,6个月时随访程控,观察ACM功能的开启情况,手工测试心房起搏阈值并与ACM功能测定的值进行比较。结果 68例均完成随访。随访期内35例(51.50%)成功开启ACM功能,其中术后第1,7天及1,2,3个月时开启例数分别为14例(20.6%)、21例(30.9%)、26例(38.2%)、28例(41.2%)和32例(47.1%)。手工测试与ACM测试的心房阈值无差异。33例因起搏器自动测定心房刺激除极波(ER)过小不推荐开启ACM功能。随访期间心电图及动态心电图(Holter)均未见心房失夺获及感知不良。与普通电压和高电压起搏相比,自动阈值管理功能在心房输出方面分别节省50%,88%的能量消耗。结论 Zephyr5826起搏器ACM功能可以安全有效的应用低能量起搏心脏。部分患者术后因起搏器测定心房ER过小未能开启ACM功能,但在随访过程中ACM的开启比例逐渐升高。     

Postural motor learning in Parkinson’s disease: The effect of practice on continuous compensatory postural regulation

IntroductionAlthough balance training is considered the most effective treatment for balance impairments in Parkinson’s disease (PD), few studies have examined if learning for balance control remains intact with PD. This study aimed to determine if learning for automatic postural responses is preserved in people with PD.MethodsEleven participants with moderate PD (68 ± 6.4 years; H&Y: 2–3) on their usual medication maintained balance on a platform that oscillated forward and backward with variable amplitude and constant frequency. Participants completed 42 trials during one training session, and retention and transfer tests following a 24-h delay. Performance was measured by comparing spatial and temporal measures of whole-body centre of mass (COM) with platform displacements. Learning was compared between participants with PD and previously reported, age-matched older adults (Van Ooteghem et al., 2010).ResultsAlthough postural responses in participants with PD were impaired compared to control participants, a majority of PD participants improved their postural responses with practice as revealed by reduced COM displacements and improved phase relationships between COM and platform motion. Rates of improvement were comparable between groups demonstrating preserved adaptive capacity for participants with PD. Similar to control participants, the PD group moved toward anticipatory COM control as a strategy for improving stability, exhibited short-term retention of performance improvements, and demonstrated generalizability of the learned responses. Rate of improvement with practice, but not retention, was related to severity of motor impairments.ConclusionsPatients with moderate PD on medication demonstrate retention of improvements in automatic postural responses with practice suggesting that intrinsic postural motor learning is preserved in this group.