793 research outputs found

    Royal Surrey County Hospital, Guildford.

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    Comparative Analysis of the Frequency and Distribution of Stem and Progenitor Cells in the Adult Mouse Brain

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    cells (NSCs) and progenitor cells, but it cannot discriminate between these two populations. Given two assays have purported to overcome this shortfall, we performed a comparative analysis of the distribution and frequency of NSCs and progenitor cells detected in 400 m coronal segments along the ventricular neuraxis of the adult mouse brain using the neurosphere assay, the neural colony forming cell assay (N-CFCA), and label-retaining cell (LRC) approach. We observed a large variation in the number of progenitor/stem cells detected in serial sections along the neuraxis, with the number of neurosphereforming cells detected in individual 400 m sections varying from a minimum of eight to a maximum of 891 depending upon the rostral-caudal coordinate assayed. Moreover, the greatest variability occurred in the rostral portion of the lateral ventricles, thereby explaining the large variation in neurosphere frequency previously reported. Whereas the overall number of neurospheres (3730 276) or colonies (4275 124) we detected along the neuraxis did not differ significantly, LRC numbers were significantly reduced (1186 188, 7 month chase) in comparison to both total colonies and neurospheres. Moreover, approximately two orders of magnitude fewer NSC-derived colonies (50 10) were detected using the N-CFCA as compared to LRCs. Given only 5% of the LRCs are cycling (BrdU/Ki-67) or competent to divide (BrdU/Mcm-2), and proliferate upon transfer to culture, it is unclear whether this technique selectively detects endogenous NSCs. Overall, caution should be taken with the interpretation and employment of all these techniques

    Philosophy of education: Learning and schooling

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    Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/43809/1/11217_2004_Article_BF00367801.pd

    Taxonomy of Educational Objectives Handbook II: Affective Domain

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    Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/43808/1/11217_2004_Article_BF00373956.pd

    City of waiting : a primary healthcare center for Laguna Beach, California

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    Thesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 2004.Pages 122 and 123 blank.Includes bibliographical references (p. 115-118).A design inquiry was undertaken into the alienating spatial qualities of healthcare facilities. The spatial tissue of the modern hospital and clinic was found to correspond tightly with Michel Foucault's definition of an institutional "disciplinary environment." As market-driven healthcare systems compete for patients, institutional power structures are being reversed. Patients have acquired the power of consumers. A new healthcare center must be an inherently open, non-disciplinary environment. On average, half of the time spent within a healthcare building is spent waiting. Yet the activity of waiting is thinly defined and unsatisfactorily inscribed by isolated waiting rooms. This thesis proposes that the realm of waiting be delimited, reconceptualized, and reconfigured in relation to building circulation and medical care spaces in order to catalyze a loosening of the traditionally closed clinical environment and its integration into the physical fabric and social life of the city. Strategies and tactics are described to reconsider the waiting experience and other overconstrained components of healthcare architecture. These tactics are deployed and tested in the design of a primary healthcare center in a small beach-side city.by Timothy M. Morshead.M.Arch

    Support for the immortal strand hypothesis: neural stem cells partition DNA asymmetrically in vitro

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    The immortal strand hypothesis proposes that asymmetrically dividing stem cells (SCs) selectively segregate chromosomes that bear the oldest DNA templates. We investigated cosegregation in neural stem cells (NSCs). After exposure to the thymidine analogue 5-bromo-2-deoxyuridine (BrdU), which labels newly synthesized DNA, a subset of neural precursor cells were shown to retain BrdU signal. It was confirmed that some BrdU-retaining cells divided actively, and that these cells exhibited some characteristics of SCs. This asymmetric partitioning of DNA then was demonstrated during mitosis, and these results were further supported by real time imaging of SC clones, in which older and newly synthesized DNA templates were distributed asymmetrically after DNA synthesis. We demonstrate that NSCs are unique among precursor cells in the uneven partitioning of genetic material during cell divisions
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