基于P89C51X2单片机的液压油污染监测系统研究

根据污染油液的电导原理,设计了基于P89C51X2单片机的油液污染监测系统。该系统可以全程监测液压油污染状况,并把监测信息传输给PC机以进行进一步的分析和处理。     

抗化学介质润滑脂7804号在加注系统中的应用

抗化学介质润滑脂7804号在加注系统中得到了广泛应用,但抗化学介质润滑脂在连续加注工况下对加注系统的影响目前尚无相关研究.在对抗化学介质润滑脂7804号的成分和性能以及与推进剂的相容性研究的基础上,分析了连续多次和长时间加注条件下润滑脂对加注系统及加注过程的影响,并模拟实际情况进行了介质加注试验验证.根据研究结果从设计、工艺和使用上提出了减小润滑脂对加注系统影响的技术途径.     

Categorizing food-related illness: Have we got it right?

Since the 1950s food safety hazards have been categorized simply as (micro) biological, chemical or physical hazards with no clear differentiation between those that cause acute and chronic harm. Indeed international risk assessment methods, including hazard analysis critical control point (HACCP) use these criteria. However, the spectrum of food related illness continues to grow now encompassing food allergy and intolerance, obesity, type 2 diabetes, stroke, heart disease, cancer as well as food poisoning, foodborne illness and food contamination. Therefore over a half-century later is this the time to redefine the spectrum of what constitutes food related illness? This paper considers whether such “redefinition” of food related intoxicating and infectious agents would provide more targeted policy instruments and lead to better risk assessment and thus mitigation of such risk within the food supply chain.     

利用太赫兹时域光谱系统检测水中污染物纯品

利用太赫兹时域光谱技术对22种水中污染物的纯品进行了检测,其中包括除草剂、化肥、塑化剂等。通过理论计算获得了上述样品在太赫兹波段的折射率和吸收系数。结果表面,2,4-二氯苯氧乙酸钠（2,4-D钠盐）和苯磺隆两种除草剂在太赫兹波段存在特征吸收峰,这些数据有利于应用太赫兹时域光谱技术对水中污染物进行检测和鉴别。     

工具污染检测仪模拟体设计

以秦山第二核电厂卫生出入口的工具污染测量仪器为研究对象,仿真国外公司的工具污染检测仪研制了一台模拟体.工具污染检测仪模拟体是一种用于模拟卫生出入口工具污染检测仪的污染控制功能的设备.用于检查学员对工具污染检测的操作是否正确,如果工具污染检测仪报警,该学员是否能进行正确的处理.对模拟体的主要功能和系统设计做了简单的介绍.     

Identification of virulence factors in contact lens associated bacteria: A physiological approach

PurposeWearing contact lens requires awareness about possible contaminants, the causative agents of multiple complications. The present study focused on identification of potential pathogens and presence of virulence associated markers in contact lens associated bacteria.MethodsBacterial contaminants were isolated from contact lenses or cleaning solutions collected from University students. Isolates were identified using conventional methods followed by 16S rRNA gene sequencing and screened for the presence of virulence factors which included capsular presence, adhesion, serum resistance, iron chelation, haemagglutination and hemolysis. Moreover, antibiotic resistance profile was also monitored.ResultsContamination was observed in 79% (45 of 57) of lenses. Based on 16S rRNA sequencing Bacillus sp. was found to be most abundant (26%). The presence of at least three pathogenic characteristics was recorded in 75.8% isolates. Among the pathogenic characteristics, capsule presence was found to be the most prevalent character (73%) followed by hemolysin production (65%), serum resistance (61%), haemagglutination (56%), iron chelation (50%) and polystyrene adherence (42%). Multiple antibiotic resistance was recorded in 66.13% isolates. Cluster analysis on the basis of virulence markers separated all isolates in two groups. Potential pathogens and non-pathogens were found to be equally frequent among contaminants of contact lens cases.ConclusionThe present work provides evidence that pathogenic bacteria can adhere and survive in contact lens or lens solution. It highlights the need for the development of new methods to protect contact lenses and lens care accessories. Drugs targeting capsule formation may offer a good option for treatment or use in cleaning solution.     

生吃水产品常见病原性生物污染的研究

为了解广东省生吃水产品以及生吃水产品养殖水等中常见病原性生物的污染情况，从1999年6月至2000年12月，对广东省18家酒店的生食生产品、养殖水和砧板进行卫生检验。结果从325份样品中，检出常见病原菌79株，包括7种致病菌，检出阳性率为24．31％，其中罗氏虾的阳性率高达50％。另外25份生鱼肉中的5份检出华支睾吸虫，检出率为20％。结果显示广东省生吃水产品中普遍存在常见病原性生物的污染，是食用后引起腹泻等肠胃不适症状以及相关疾病发病率增加的重要原因，应该加强食品卫生管理和食用安全性研究。     

成都市散装糕点微生物质量情况调查与分析

目的检测成都市散装糕点微生物的污染情况,分析主要污染来源以及风险点并提出改进措施。方法参考GB 7099-2015《食品安全国家标准糕点、面包》中的微生物要求对市场上销售散装糕点进行菌落总数、大肠菌群、霉菌以及致病菌(沙门氏菌、金黄色葡萄球菌)检测,并对含肉制品散装糕点进行单核细胞增生李斯特氏菌检测。对直接接触食品的包装材料进行大肠菌群检测。结果散装糕点菌落总数不合格率为63%,大肠菌群不合格率40%,霉菌不合格率为16%。均未检出致病菌。结论成都市散装糕点微生物不合格率较高,散装糕点生产销售企业也存在一定食品安全问题,监管部门对该行业应加强管理力度。     

食品污染物监测及其健康影响评价的研究简介

为保障食品安全，“食品污染物监测及其健康影响评价的研究”被列入国家科技部“十五”攻关课题。主要研究内容为食品污染物分析质量控制研究；污染物(包括金属污染物，农药残留)监测技术研究；建立有害物质暴露危险性评估技术；生物学标志物研究。研究完成后，建立了我国与国际接轨的污染物监测网框架，提出了我国食品污染物监测分析质量控制评价原则，提高了我国污染物监测水平。绘制了我国食品污染物基本状况表。我国食品中重金属污染主要是铅污染，各年龄段铅的摄入量偏高，特别是儿童已经达到PTWI的105．6％～109．7％。说明我国食品中铅的含量偏高，应该修订国家标准。镉污染主要在鱼类，全国平均值超过国家标准，其中河南省淡水鱼的镉平均值是国家标准的近3倍，其他食品镉的污染不严重。砷、汞在食品中的污染不严重。成功地以总膳食研究为手段进行膳食暴露评估。在国际上首先建立了反映人体微量氯丙醇暴露的8—氯乳酸的痕量检测技术，并作为理想的接触标志物用于人体氯丙醇的暴露评价；初步建立了以监测母乳中二噁英负荷水平作为接触标志物和生殖内分泌指标作为效应标志物的体系；应用人胚肾LH／CG受体重组细胞株生物发光法测定血清中的BCG。研制出监测网研制数据上报系统计算机软件。该研究对保障食品安全提供了方法和科学依据。