A fluorescence based method for the quantification of surface functional groups in closed micro- and nanofluidic channels

Surface analysis is critical for the validation of microfluidic surface modifications for biology, chemistry, and physics applications. However, until now quantitative analytical methods have mostly been focused on open surfaces. Here, we present a new fluorescence imaging method to directly measure the surface coverage of functional groups inside assembled microchannels over a wide dynamic range. A key advance of our work is the elimination of self-quenching to obtain a linear signal even with a high density of functional groups. This method is applied to image the density and monitor the stability of vapor deposited silane layers in bonded silicon/glass micro- and nanochannels.     

Die Aufgaben der Allgemeinen Pädagogik

Seit einigen Jahren gibt es eine lebhafte Auseinandersetzung über die Allgemeine P?dagogik und über die Aufgaben, die die Allgemeinen P?dagogen erfüllen sollen. In diesem Aufsatz werden die unterschiedlichen Ansichten über diese Frage zusammengetragen, analysiert und in einen systematischen Zusammenhang gebracht. Dabei werden moralphilosophische und fachbezogene Aufgaben unterschieden. Bei den fachbezogenen Aufgaben gibt es zwei Gruppen: kritische und konstruktive Aufgaben. Zur zweiten Gruppe geh?ren insbesondere (a) die Bestimmung des Forschungsgegenstands der P?dagogik, (b) die Lenkung der Forschungsbemühungen, (c) die Bestimmung der Grundbegriffe und (d) die Darlegung des p?dagogischen Grundgedankens. Bei allen diesen Aufgaben werden die Voraussetzungen für ihre Erfüllung und die Schwierigkeiten diskutiert, mit denen dabei zu rechnen ist.     

Academic librarian's transition to blended librarianship: a phenomenology of selected academic librarians in Zimbabwe

This paper explores the shared experiences of practices of blended librarianship among Zimbabwean academic librarians to identify how adequately they comply with their dynamic roles and functions. The paper relies on the theoretical constructs from Bell and Shank's (2004, 2007) blended librarianship and Lave and Wenger's (1991) Legitimate Peripheral Participation (LPP) to understand how Zimbabwean academic librarians practice blended librarianship in the workplace through engagement in legitimate work tasks. The investigators used phenomenology to explore academic librarians' experiences of blended librarianship. They selected a sample of 101 academic librarians and delivered a semi-structured questionnaire to the sample, conducted document research and interviewed key informants from the sample. The researchers collected data from the Bindura University of Science Education, Chinhoyi University of Technology, Lupane State University, Midlands State University, the National University of Science and Technology, and PHSBL80 Library which chose to be undisclosed. Each institution adopted blended librarianship in its way. Four (4) different categories of blended librarianship emerged from the experiences; that is “transcending blended librarians”, “partially blended librarians”, “intermittent blended librarians” and “aspiring blended librarians”, displaying each institution's level of instructional technology and instructional design roles. The study proposes that the “Academic librarian's transition to blended librarianship” two-by-two matrix that developed was in this inquiry needs further refinement. Further enquiries may test the matrix within the same sites or other locales altogether to corroborate if the results are replicable.