Flow biosensing and sampling in indirect electrochemical detection     

Lamberti F  Luni C  Zambon A  Andrea Serra P  Giomo M  Elvassore N 《Biomicrofluidics》2012,6(2):24114-2411413

Miniaturization in biological analyses has several advantages, such as sample volume reduction and fast response time. The integration of miniaturized biosensors within lab-on-a-chip setups under flow conditions is highly desirable, not only because it simplifies process handling but also because measurements become more robust and operator-independent. In this work, we study the integration of flow amperometric biosensors within a microfluidic platform when analyte concentration is indirectly measured. As a case study, we used a platinum miniaturized glucose biosensor, where glucose is enzymatically converted to [Formula: see text] that is oxidized at the electrode. The experimental results produced are strongly coupled to a theoretical analysis of fluid dynamic conditions affecting the electrochemical response of the sensor. We verified that the choice of the inlet flow rate is a critical parameter in flow biosensors, because it affects both glucose and [Formula: see text] transport, to and from the electrode. We identify optimal flow rate conditions for accurate sensing at high time resolution. A dimensionless theoretical analysis allows the extension of the results to other sensing systems according to fluid dynamic similarity principles. Furthermore, we developed a microfluidic design that connects a sampling unit to the biosensor, in order to decouple the sampling flow rate from that of the actual measurement.  相似文献   

Book reviews     

Catherine Doherty  Warren Sellers  Peter Appelbaum  Nicola F. Johnson 《The Australian Educational Researcher》2010,37(4):115-124

  相似文献   

Probabilities and possibilities within Australia’s future: Rethinking educational research     

Alison Lee  Nicola F. Johnson 《The Australian Educational Researcher》2010,37(4):1-7

  相似文献   

Cultural distance,mindfulness and passive xenophobia: Using Integrated Threat Theory to explore home higher education students’ perspectives on ‘internationalisation at home’     

Neil Harrison  Nicola Peacock 《British Educational Research Journal》2010,36(6):877-902

This paper addresses the question of interaction between home and international students using qualitative data from 100 home students at two ‘teaching intensive’ universities in the southwest of England. Stephan and Stephan's Integrated Threat Theory is used to analyse the data, finding evidence for all four types of threat that they predict when outgroups interact. It is found that home students perceive threats to their academic success and group identity from the presence of international students on the campus and in the classroom. These are linked to anxieties around ‘mindful’ forms of interaction and a taboo around the discussion of difference, leading to a ‘passive xenophobia’ for the majority. The paper concludes that Integrated Threat Theory is a useful tool in critiquing the ‘internationalisation at home’ agenda, making suggestions for policies and practices that may alleviate perceived threats, thereby improving the quality and outcomes of intercultural interaction.  相似文献   

Using research in practice     

Bexon N  Brice A  Booth A 《Health information and libraries journal》2003,20(4):240-243

  相似文献   

How technology for comprehension training can support conversation towards the joint construction of meaning     

Nicola Yuill  Darren Pearce  Lucinda Kerawalla  Amanda Harris  Rosemary Luckin 《Journal of Research in Reading》2009,32(1):109-125

Two studies assessed the role of Separate Control of Shared Space (SCoSS) technology in supporting peer collaborative discussion and comprehension. We hypothesised that providing equitable shared input to two literacy tasks (both good predictors of comprehension skill) would support discussion to promote the joint construction of meaning, and hence individual progress. Study 1: 50 7–9‐year‐olds took a reading‐specific multiple classification (RMC) pre‐test, categorising words on two dimensions, before training on the task in pairs using SCoSS, dual‐control or individual technology. Discussion produced more accurate post‐test classification performance and SCoSS was associated with higher frequency of statements during training that combined both RMC dimensions (surface form and meaning of words). Study 2: 12 8–9‐year‐olds were pre‐tested on story recall and worked in pairs on a SCoSS‐supported story construction task, requiring collaborative inference‐making, hypothesis generation and selection. Post‐test story recall was predicted by the frequency of deductive causal statements during training. We discuss how technology can be used to promote collaboration and discussion that supports joint understanding and individual comprehension development.  相似文献   

Demonstration as a rate enhancer to changes in coordination during early skill acquisition     

Horn RR  Williams AM  Hayes SJ  Hodges NJ  Scott MA 《Journal of sports sciences》2007,25(5):599-614

  相似文献   

Heirs and Spares: Elite Fathers and Their Sons in the Literary Sources of Umayyad Iberia     

Nicola Clarke 《Al-Masaq: Islam & the Medieval Mediterranean》2016,28(1):67-83

ABSTRACT

In the medieval Islamic world, elite men were the benchmark of hegemonic masculinity and social power. A presumption of masculine authority within the household shaped the way early medieval rulers were described by chroniclers, and how medieval fathers related to their sons. The formal and informal ways in which they interacted with lower status men – whether their clients, their courtiers, or their sons – were hedged about with the symbolic language of gender. The article focuses on the ways in which certain Andalusī literary sources talk about relations of fathers and their sons with the ruling Umayyad family, to offer an additional dimension to our picture of how the dynasty conceptualised and legitimised its power.  相似文献   

Towards a Semantic Documentation of Heritage Objects through Visual and Iconographical Representations     

Nicola Carboni  Livio de Luca 《International Information and Library Review》2017,49(3):207-217

The recording of cultural heritage objects' data and information is constructed throughout the registration of different media items, which function as an anchor of the original object in digital space. The article investigates the application of a theoretical framework for the organization of information related to the visual works, on the base of the identity of their single constituent elements. The framework is, then, used for the formalization of an ontology which is constructed as an extension of CIDOC-CRM. The result is tested with information gathered over the Asinou Church in Cyprus, expressed throughout an ontology for recording propositions over the iconographical attributes and the characteristic of images.  相似文献   

A microfluidic device to apply shear stresses to polarizing ciliated airway epithelium using air flow     

Dennis Trieu  Thomas K. Waddell  Alison P. McGuigan 《Biomicrofluidics》2014,8(6)

Organization of airway epithelium determines ciliary beat direction and coordination for proper mucociliary clearance. Fluidic shear stresses have the potential to influence ciliary organization. Here, an in vitro fluidic flow system was developed for inducing long-term airflow shear stresses on airway epithelium with a view to influencing epithelial organization. Our system consists of a fluidic device for cell culture, integrated into a humidified airflow circuit. The fluidic device has a modular design and is made from a combination of polystyrene and adhesive components incorporated into a 6-well filter membrane insert. We demonstrate the system operates within physiologically relevant shear and pressure ranges and estimate the shear stress exerted on the epithelial cell layer as a result of air flow using a computational model. For both the bronchial epithelial cell line BEAS2B and primary human tracheal airway epithelial cells, we demonstrate that cells remain viable within the device when exposed to airflow for 24 h and that normal differentiation and cilia formation occurs. Furthermore, we demonstrate the utility of our device for exploring the impact of exposing cells to airflow: our tool enables quantification of cytoskeletal organization, and is compatible with in situ bead assays to assess the orientation of cilia beating.  相似文献