71 research outputs found

    Rapid Assessment of Intracytoplasmic Membranes in Bacteria by Fluorescence Microscopy

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    An evaluation of the welcome aboard phase of internal public relations program of the United States Navy

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    An evaluation of the Navy's Welcome Aboard' program* constitutes the area of study of this thesis. The Navy's Welcome Aboard programs for the purpose of this thesis are defined as internal relations practices affecting transit personnel, i. e .. personnel who are going from one duty station to another.http://www.archive.org/details/evaluationofwelc00whi

    The Analyzing Power for p-p Scattering at 180 MeV

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    This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440

    Progress on the Charge-Symmetry-Breaking Experiment

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    This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440

    A Measurement of C_NN in n-p Scattering at 188 MeV

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    This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440

    Observing Ultra High Energy Cosmic Particles from Space: SEUSO, the Super Extreme Universe Space Observatory Mission

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    The experimental search for ultra high energy cosmic messengers, from E1019E\sim 10^{19} eV to beyond E1020E\sim 10^{20} eV, at the very end of the known energy spectrum, constitutes an extraordinary opportunity to explore a largely unknown aspect of our universe. Key scientific goals are the identification of the sources of ultra high energy particles, the measurement of their spectra and the study of galactic and local intergalactic magnetic fields. Ultra high energy particles might, also, carry evidence of unknown physics or of exotic particles relics of the early universe. To meet this challenge a significant increase in the integrated exposure is required. This implies a new class of experiments with larger acceptances and good understanding of the systematic uncertainties. Space based observatories can reach the instantaneous aperture and the integrated exposure necessary to systematically explore the ultra high energy universe. In this paper, after briefly summarising the science case of the mission, we describe the scientific goals and requirements of the SEUSO concept. We then introduce the SEUSO observational approach and describe the main instrument and mission features. We conclude discussing the expected performance of the mission

    Evaluation of Absolute Cross Sections for the p(n,d)γ Reaction at T_n = 138 Mev

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    This research was sponsored by the National Science Foundation Grant NSF PHY-931478

    A cre-inducible DUX4 transgenic mouse model for investigating facioscapulohumeral muscular dystrophy

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    The Double homeobox 4 (DUX4) gene is an important regulator of early human development and its aberrant expression is causal for facioscapulohumeral muscular dystrophy (FSHD). The DUX4-full length (DUX4-fl) mRNA splice isoform encodes a transcriptional activator; however, DUX4 and its unique DNA binding preferences are specific to old-world primates. Regardless, the somatic cytotoxicity caused by DUX4 expression is conserved when expressed in cells and animals ranging from fly to mouse. Thus, viable animal models based on DUX4-fl expression have been difficult to generate due in large part to overt developmental toxicity of low DUX4-fl expression from leaky transgenes. We have overcome this obstacle and here we report the generation and initial characterization of a line of conditional floxed DUX4-fl transgenic mice, FLExDUX4, that is viable and fertile. In the absence of cre, these mice express a very low level of DUX4-fl mRNA from the transgene, resulting in mild phenotypes. However, when crossed with appropriate cre-driver lines of mice, the double transgenic offspring readily express DUX4-fl mRNA, protein, and target genes with the spatiotemporal pattern of nuclear cre expression dictated by the chosen system. When cre is expressed from the ACTA1 skeletal muscle-specific promoter, the double transgenic animals exhibit a developmental myopathy. When crossed with tamoxifen-inducible cre lines, DUX4-mediated pathology can be induced in adult animals. Thus, the appearance and progression of pathology can be controlled to provide readily screenable phenotypes useful for assessing therapeutic approaches targeting DUX4-fl mRNA and protein. Overall, the FLExDUX4 line of mice is quite versatile and will allow new investigations into mechanisms of DUX4-mediated pathophysiology as well as much-needed pre-clinical testing of DUX4-targeted FSHD interventions in vivo
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