Considering complexity in simple solutions: what’s so complicated about Skype?

Video-based communications technologies are not new. However, with increasing drivers for efficiency and cost-effectiveness in higher education, the use of this technology is being explored for what have traditionally been face-to-face activities. This article conceptualises the intricacies of influencing factors affecting the performance of video-based communications in student support activities. Considering video-based communication within student support as a complex adaptive system, the author aims to illustrate how a multitude of intrinsic and extrinsic variables interact and impact upon individual experiences. Using an illustrative diagram, the article explores how psychology and behavioural aspects integrate with communications theory, technological experience, task objectives and social presence theory to necessitate careful consideration of individual need and purpose when planning for technological implementation

利用EIA生物测试法快速定量筛选环境样品中的二噁污染物

将采集的环境样品分作 3份 ,1份用于高分辨色质联用多离子检测测定二的毒性当量浓度 TEQ,另 2份分别用 7-乙氧基 -异吩唑酮 -脱乙基酶 ( EROD)活力诱导法和酶免疫法 ( Enzyme Immuno Assay,EIA)进行生物测试 .结果表明 EIA和EROD这 2种生物试验方法均具有较好的准确性和很宽的线性范围 .比较 Micro- EROD分析结果与化学分析结果以及 EIA分析结果与化学分析结果 ,发现 Micro- EROD生物试验所测得的 TEQ值均高于化学分析法的 TEQ

鱼肝EROD酶活力诱导作为二噁的水生态毒理学指标

利用离体EROD法对严家湖各氧化塘鱼肝中二噁的毒性效应进行了定量测定，同时与HRGC／HRMS－MID化学分析结果和野外活体暴露鱼肝中EROD活力诱导结果进行了比较。研究发现，各氧化塘中鱼肝的离体、活体EROD测定结果与化学分析结果之间有着极好的相关性。这不仅揭示了鱼肝细胞色素P450系统以EROD酶活力诱导指示可作为二的水生态毒理学指标的可靠性和准确性，同时也表明了活体EROD和离体EROD生物监测方法两者可以相互补充，用于其他环境生物样品中二类毒物的快速筛选