光谱法研究血红蛋白与亚硝酸钠的相互作用     

唐乾  张越  曹洪玉  郑学仿 《大连大学学报》2014,(3):77-81

采用紫外-可见光谱、荧光光谱、同步荧光光谱和圆二色(CD)光谱等方法研究了人血红蛋白与亚硝酸钠配位反应的光谱学性质。结果表明:血红蛋白与亚硝酸钠配位反应的进行受血红素中心铁原子价态的影响。高铁血红蛋白与亚硝酸钠发生配位反应生成Hb(III)-NaNO2;亚铁血红蛋白与亚硝酸钠反应生成Hb(II)-NaNO2。但是随着时间的推移,Hb(II)-NaNO2配合物逐渐解离,解离出的亚铁血红蛋白逐渐被氧化成高铁血红蛋白,溶液中的亚硝酸钠再与高铁血红蛋白反应,最终生成Hb(III)-NaNO2配合物。此外,荧光光谱、同步荧光光谱和CD数据显示亚硝酸钠的加入改变了血红蛋白氨基酸残基的微环境,且作用点更接近于色氨酸残基位置,而对蛋白质二级结构影响甚微。  相似文献   

高校教室照明系统节能优化措施探析     

赵家敏 《云南电大学报》2014,(3):85-88

高校教室照明系统节能优化是我国建设节约型社会的重要组成部分。为有效节约高校教室照明用电,应从照明节能优化原则出发,采取多种措施节能优化措施,以达到照明节能目的。  相似文献   

适于数字家庭的学习型红外遥控器设计     

刘永广  张宏怡 《鹭江职业大学学报》2014,(3):71-75

为适应数字家庭集约化控制的需求,提出一种基于RS485通信协议的学习型红外遥控器设计方案。该方案利用微控制器STM32F103RBT6中定时器的输入捕获功能,精确测量所要学习的红外遥控信号编码脉冲的脉宽并将脉宽数据存储于外部存储器中,发射时提取对应的红外编码脉冲脉宽数据并还原为红外遥控信号对被控设备实施遥控;利用LabVIEW编写上位机测试软件,通过RS485通信接口控制该遥控器的红外学习和发射过程。某品牌电视机和空调遥控信号测试结果表明,所设计的学习型红外遥控器对采用不同红外协议的家电均可实施集约控制且性能稳定。  相似文献   

火焰原子吸收法直接测定粗铜中的银     

黄环  方广亮 《大众科技》2014,(9):57-58

建立了一种在15%左右的盐酸介质中用火焰原子吸收法直接测定粗铜中银的含量的分析方法。该方法的回收率在98.7%~101.2%之间,同时样品结果与粗铜国家标准分析方法就行对照,结果令人满意。  相似文献   

远红外线与空气负离子生物学效应及其临床应用     

温文 《大众科技》2014,(11):143-145

文章从远红外线和空气负离子的基本概念和特征入手,分析了远红外线和空气负离子的生物学效应,并对国内外的相关临床应用做了一定的蔬理,认为远红外线主要的功效是消炎止痛、促进组织再生与修复、消毒灭菌和抑制肿瘤等;而空气负离子对呼吸系统、循环系统和神经系统疾病均有明显的疗效。  相似文献   

传感器在智能手机中的应用     

刘为 《职大学报》2013,(6):76-78,100

展望未来,使用射频传感器进行指纹识别,使用光学传感器进行眼球识别,基于化学的气味传感器以及有自学功能的智能传感器等,都将出现在智能手机中,进而给人们在手机的使用中带来更多的便利。  相似文献   

Policy change to improve pathology turnaround time and reduce costs – possible to do both?     

Goce Dimeski  Breeann Silvester  Jacobus Ungerer  Leslie Johnson  Jennifer H. Martin 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2013,23(3):296-302

Background:

Overcrowding and prolonged length of stay in emergency departments (ED) are increasing problems in hospitals. Rapid availability of all laboratory results has an impact on clinical decision-making, admissions or discharge decisions and resource utilisation. Increasing number of our urinary drugs of abuse (DOA) screens had a turnaround time (TAT) of up to 33 days after the discharge of the patient.

Materials and methods:

Following an audit and a consultation period with clinicians using the service, a policy change was implemented to reduce the use of gas chromatography mass spectroscopy (GCMS): all requests would have a standard immunoassay (IA) test panel undertaken unless specifically they requested GCMS (including medico-legal) analysis.

Results:

Almost all of the clinicians interviewed had no understanding of the DOA screening or the difference in the information generated between a confirmatory GCMS urine toxicology screen and IA DOA panel. It appeared none of the patients surveyed in the audit would have had a different clinical decision made if a GCMS had not been undertaken. Post change audit showed only 4.3% of drug requests for IA also received a confirmatory GCMS testing. The estimated saving post change implementation was $127,000 (AU $) in test costs alone over a two year period. The TAT of GCMS results was reduced to 3–4 days.

Conclusion:

A laboratory-led behavioural change in test requesting is possible and sustainable provided the reason is clinically sound and accompanied by consultation and availability of advice by phone when requested on test requesting or interpretation.  相似文献   

Muscle oxygenation and EMG activity during isometric exercise in children     

Wassim Moalla  Abdallah Merzouk  Frédéric Costes  Zouhair Tabka 《Journal of sports sciences》2013,31(11):1195-1201

Abstract

The aim of this study was to examine the time-course of and the relationships between muscle oxygenation, blood volume and myoelectrical manifestations during isometric exercise in children. Twelve healthy children aged 12.5 ± 1.2 years (mean ± s) performed an isometric knee extension at 50% of their maximal voluntary contraction (MVC) until exhaustion to assess endurance time (limit time, T _lim). Changes in muscle oxygenation and blood volume were assessed by near infrared spectroscopy (NIRS). The root mean square (RMS) amplitude and the mean power frequency (MPF) from electromyogram (EMG) signals were obtained, as NIRS parameters, from the vastus lateralis. Mean T _lim was 117 ± 34 s. The muscle oxygenation and blood volume curves decreased immediately at the beginning of exercise. Maximal deoxygenation occurred at 50% T _lim, and fell by 76.9% from the resting value. Similarly, minimal blood volume was observed at 50% T _lim; it reached a plateau that lasted until the end of exercise. The kinetics of the MPF and RMS curves were inversely related to time. At the last set of exercises (after 75% T _lim), a steeper RMS curve and an abrupt decrease in the MPF curve were observed. Significant correlations (r) between muscle oxygenation, blood volume, root mean square amplitude and mean power frequency were observed, which ranged from 0.72 to 0.99. These findings suggest that the fatigue resulting from sustained isometric exercise is related to a decrease in oxygenation and blood volume.  相似文献   

基于MSP430F149的红外热像仪电路板信号故障检测     

杨晋华 《太原大学学报》2012,13(1):128-130

利用TEXASINSTRUMENTS公司生产的MSP430F149型16位的单片机,可以设计成为针对红外热像仪的电路板信号故障检测硬件电路。该电路利用单片机内部的12位A／D转换器以及外置16位A／D芯片对模拟信号进行数据采集转换,并通过LED发光二极管将检测结果显示出来。同时也可利用单片机的USART串口,将数据传输给上位机（Pc）。该设计具有硬件电路简单、采集精度高、实时显示等优点。  相似文献   

基于光学的多点触摸交互系统技术研究     

沈翔 《商丘职业技术学院学报》2012,(5):82-85

基于红外线投射和感应的多点触摸交互系统,通过设计红外线感应以及对反射光的图像处理,将图像映射成多点触摸手势.系统通过标准协议将手势传输到应用程序,完成交互.系统利用开源开发框架,扩展系统应用范围,满足各个领域的需要.  相似文献