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本文简要介绍生物传感器的基本原理结构、分类、特点及应用评述了电化学传感器在生物传感器发展中的作用和地位,特别是微型电化学传感器的出现大大促进了生物传感器的出现大大促进了生物传感器的发展,微切削加工技术和微电子平面工艺的引入使生物传感器的微型化多功能集成化智能化和机电一体人成为可能,它导致了由单一传感器向完整的分析系统的发展。 相似文献
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蛋白质作为生命有机体的主要成分,是细胞内各类代谢和调控等生命功能的执行者,而电子的运动是生命的基本运动,电子传递、离子迁移在生命过程中普遍存在,化学信息分子的功能、 相似文献
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电化学/生物传感器快速检测大肠杆菌的研究进展 总被引:2,自引:0,他引:2
大肠杆菌广泛分布于自然界中,通常被用来作为水体系统排泄物污染情况的指示菌.它是大面积食物中毒的主要原因之一,严重感染者会引发败血症、肾功能衰竭等危及生命的并发症.电化学/生物传感器具有独特的优势,如能在浑浊溶液中操作、选择性好、灵敏度高、检测速度快等,因此在临床检测、环境保护和食品安全等领域得到了广泛应用.该文主要对电化学,生物传感器快速检测大肠杆菌的研究进展进行了简要的综述. 相似文献
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生化需氧量(BOD)是表征水中有机污染物含量的重要指标,对水质监测和生化过程控制具有重要意义.总结了构成BOD检测系统的各环节,阐述了BOD微生物传感器中微生物选取、固定化以及换能器等关键技术,分析了不同方法的特点,讨论了目前BOD微生物传感器在研究中遇到的主要问题,并对其发展方向进行了展望. 相似文献
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生物需氧量(BOD)是一种表征水体有机污染程度的综合指标,广泛用于水体检测和污水处理厂的运行控制.概述了生物传感器BOD快速测定仪电气控制系统的工作原理,详细介绍了该仪器的硬件配置和软件设计,其用户界面设计为人机友好的视窗模式,从而实现自动检测实时显示等功能,能够满足水体有机污染快速准确检测的要求,对于我国水质评价、合... 相似文献
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Purnima Dhall Anil Kumar Abha Joshi Tushya Kumar Saxsena Angamuthu Manoharan Santosh Dayal Makhijani Rita Kumar 《Sensors and actuators. B, Chemical》2008,133(2):478-483
An amperometric biosensor for determination of biochemical oxygen demand in wastewater has been developed to overcome the time consuming monitoring procedures. The performance and stability of the immobilized membrane have been investigated at 37 °C and pH 6.8. Immobilized microbial membranes maintain their stability and activity after intermittent use for 400 cycles when stored at 4 °C in sodium phosphate buffer pH 6.8. The response time of the BOD sensor was only 90 min, being independent of the concentration, and the lower detection limit was 1 mg/l. The obtained BOD values showed correlation with that of the conventional method for BOD determination (BOD5) with a deviation of ±10%. Moreover, the sensor exhibits good repeatability (3.39–4.45%) and reproducibility (1.85–2.25%). Software was added to upgrade this sensor and to make it a promising candidate for online monitoring. 相似文献
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本文是以BSA-GA为交联剂,将异常汉逊氏酵母菌(Hansenula anomalaVar.scheggil)菌体固定成膜,与氧电极偶合研制成BOD微生物传感器.在29.5℃、pH6.8的工作条件下,该传感器响应时间为2~3min,线性范围1~85mg/L,标准偏差0.91mg/L,变异系数4.2%,回收率94~107%,该电极操作简便、快速、测定的重现稳定性较好,能连续稳定测试一周以上,可作为各种污水中BOD测定的新方法. 相似文献
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BOD微生物传感器和快速BOD测定仪的研制 总被引:7,自引:0,他引:7
报导了一种用皮状丝孢酵母组成的BOD微生物传感器和流通式微机化愉速BOD测定仪。本法的响应时间为(3~7)min,测定范围为(10~60)mg/L,线性方程ΔI=0.42+1.64C,相关系数γ=0.097。对40mg/LBOD标样平行测定8次的相对标准偏差RD=3.71%,加标回收率为94.1%~104.7% 相似文献
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An optical biosensor for parallel multi-sample determination of biochemical oxygen demand (BOD) in wastewater samples has been developed. The biosensor monitors the dissolved oxygen (DO) concentration in water through an oxygen sensing film immobilized on the bottom of glass sample vials. The oxygen sensing film contains the tris(4,7-diphenyl-1,10-phenanthroline) ruthenium(II) dye (Ru(dpp)) the luminescence intensity of which varies with oxygen concentration. A computer-controlled moving optrode head with four blue light emitting diodes (LEDs) was scanned sequentially under each sample vial. The luminescence signal was collected by an optical cable and transmitted to a photomultiplier tube (PMT) and processed by a microcomputer. The microbial samples (activated sludge and Bacillus subtilis were immobilized in a sol–gel composite material of silica and poly(vinyl alcohol)-grafted-poly(vinylpyridine) on the oxygen sensing film. The performance of the microbial film as a function of cell loading, thickness, temperature and pH and in the presence of heavy metals as well as its stability and service life have been investigated. The BOD value was determined from the rate of oxygen consumption by the microorganisms in the first 20 min. The BOD values obtained from this biosensor correlates well with the results of the conventional 5-day BOD test. 相似文献
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为了完成所研制的MEMS气体流量传感器样品的流量测试与标定,设计制作了一种由标准流量发生器和传感器信号读出与数据采集电路组成的简易流量测试装置。标准流量发生器由注射器和可更换的砝码组成,利用不同的砝码配重,在注射器出气口产生合适的恒定气体流速。通过理论分析和Ansys有限元数值仿真,验证了简易标准流量发生器的可行性。传感器信号读出与数据采集电路基于内建多路A/D转换器的单片机实现,具有传感器加热电阻器的恒温控制、流量信号的数字检测和显示的功能。采用该简易流量测试装置对自行研制的MEMS气体流量传感器进行了流量测试与标定,获得了待测器件的标定参数、传感器流量测量的绝对误差和相对误差。 相似文献