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71.
Innovative Higher Education - The categorization of predominantly white institutions (PWIs) and minority serving institutions (MSIs) affects the distribution of resources, privileges, and... 相似文献
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The dielectric properties of tumour cells are known to differ from normal blood cells, and this difference can be exploited for label-free separation of cells. Conventional measurement techniques are slow and cannot identify rare circulating tumour cells (CTCs) in a realistic timeframe. We use high throughput single cell microfluidic impedance cytometry to measure the dielectric properties of the MCF7 tumour cell line (representative of CTCs), both as pure populations and mixed with whole blood. The data show that the MCF7 cells have a large membrane capacitance and size, enabling clear discrimination from all other leukocytes. Impedance analysis is used to follow changes in cell viability when cells are kept in suspension, a process which can be understood from modelling time-dependent changes in the dielectric properties (predominantly membrane conductivity) of the cells. Impedance cytometry is used to enumerate low numbers of MCF7 cells spiked into whole blood. Chemical lysis is commonly used to remove the abundant erythrocytes, and it is shown that this process does not alter the MCF7 cell count or change their dielectric properties. Combining impedance cytometry with magnetic bead based antibody enrichment enables MCF7 cells to be detected down to 100 MCF7 cells in 1 ml whole blood, a log 3.5 enrichment and a mean recovery of 92%. Microfluidic impedance cytometry could be easily integrated within complex cell separation systems for identification and enumeration of specific cell types, providing a fast in-line single cell characterisation method. 相似文献
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Investigations of people's understanding of the evolution of species have focused mainly on secondary school and university students. Very few investigations have taken into consideration younger students, and none have related children's ideas about the origin of species to formal instruction on this topic. To help fill this gap, the present study examines the effect of this instruction in elementary school children by comparing Italian second graders (n = 21; age = 7 years, 1 month, to 8 years, 7 months) with third graders (n = 18; age = 8 years, 1 month, to 9 years, 4 months) who had been taught about “the earth before humans” for several months in keeping with the Italian National Syllabus for this grade level. Semistructured interviews were used to examine children's thoughts about speciation. The majority of second graders used a creationist framework, whereas most third graders used a mixed framework (referring to both creation and evolution) or an evolutionary framework. However, children did not know about the mechanism of evolution and considered it to be the result of the passage of time, the use and disuse of body parts, or the need to adapt to a changing environment, as suggested by their teacher and textbooks. 相似文献
75.
Veronica I. McKay 《International Journal of Inclusive Education》2013,17(4):435-456
In this article, we locate the Kha Ri Gude South African Mass Literacy Campaign within the context of the problem of illiteracy and exclusion in South Africa, while concentrating on various post-apartheid initiatives designed to give visually challenged adults the opportunity to become literate. We shall provide a detailed account of focus group sessions organised in 2012; the aim of these sessions was to explore the experiences of blind literacy practitioners who were charged with the supervision and coordination of Braille literacy classes for blind, illiterate adults. We suggest that the way the practitioners expressed what being involved in the Campaign meant for them for an extended period (three years or more) gives us a glimpse of how, through their roles as literacy organisers, they were able to engender agency among blind adult literacy learners and themselves. 相似文献
76.
Fahm AbdulGafar Olawale Azeez Adesina Lukuman Imam-Fulani Yusuf Olayinka Mejabi Omenogo Veronica Faruk Nasir Abdulrahaman Musbau Dogo Olawoyin Lukman Abiodun Oloyede Abdulkarim Ayopo Surajudeen-Bakinde Nazmat Toyin 《Education and Information Technologies》2022,27(3):3135-3169
Education and Information Technologies - The Almajiri children in Nigeria are deserving of special interventions to reduce the life-long divide in educational achievement, social status, and... 相似文献
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Andrea Bjornestad Veronica Johnson Jo Hittner Kristine Paulson 《Counselor Education & Supervision》2014,53(4):242-253
Counselor educators maintain a responsibility for providing site supervisors with professional development opportunities (Council for Accreditation of Counseling and Related Educational Programs. 2009 ). The goal of this study was to evaluate a model for providing preparation to site supervisors. Significant differences were observed from pretest to posttest on the Supervisory Self‐Efficacy Scale (Johnson & Stewart, 2008 ). 相似文献
79.
Patrick J. Curran Veronica Cole Daniel J. Bauer Andrea M. Hussong Nisha Gottfredson 《Structural equation modeling》2016,23(6):827-844
A challenge facing nearly all studies in the psychological sciences is how to best combine multiple items into a valid and reliable score to be used in subsequent modeling. The most ubiquitous method is to compute a mean of items, but more contemporary approaches use various forms of latent score estimation. Regardless of approach, outside of large-scale testing applications, scoring models rarely include background characteristics to improve score quality. This article used a Monte Carlo simulation design to study score quality for different psychometric models that did and did not include covariates across levels of sample size, number of items, and degree of measurement invariance. The inclusion of covariates improved score quality for nearly all design factors, and in no case did the covariates degrade score quality relative to not considering the influences at all. Results suggest that the inclusion of observed covariates can improve factor score estimation. 相似文献
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