295 research outputs found

    Mechanical Team Final Design Report: Same Polytechnic College

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    The purpose of this document is to communicate the research, findings, and recommendations of the mechanical engineering team regarding the Same Polytechnic College project. This report includes a discussion of the design process utilized by the interdisciplinary team to construct preliminary building designs for both classroom and dormitory building modules. The mechanical team conducted testing using the wind tunnel to verify major building envelope design decisions. The following report also includes an explanation of the thermal testing that the team conducted to measure the thermal conductivity, diffusivity, and specific heat of bricks made to mimic those made locally in Same, Tanzania. The test combines predictions made in EES, transient testing using thermocouples, calorimetry, and MATLAB. The report concludes with recommendations made by the mechanical team for future design implementations

    The Political Personality of President Donald Trump in Office

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    Psychodiagnostically relevant data regarding U.S. president Donald Trump were collected from media reports published since his inauguration on January 20, 2017, and synthesized into a personality profile using the Millon Inventory of Diagnostic Criteria (MIDC). The poster summarizes the results of the at-a-distance psychological assessment

    Heme Deficiency in Alzheimer's Disease: A Possible Connection to Porphyria

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    Mechanisms that cause Alzheimer's disease (AD), an invariably fatal neurodegenerative disease, are unknown. Important recent data indicate that neuronal heme deficiency may contribute to AD pathogenesis. If true, factors that contribute to the intracellular heme deficiency could potentially alter the course of AD. The porphyrias are metabolic disorders characterized by enzyme deficiencies in the heme biosynthetic pathway. We hypothesize that AD may differ significantly in individuals possessing the genetic trait for an acute hepatic porphyria. We elaborate on this hypothesis and briefly review the characteristics of the acute hepatic porphyrias that may be relevant to AD. We note the proximity of genes encoding enzymes of the heme biosynthesis pathway to genetic loci linked to sporadic, late-onset AD. In addition, we suggest that identification of individuals carrying the genetic trait for acute porphyria may provide a unique resource for investigating AD pathogenesis and inform treatment and management decisions

    Heme Deficiency in Alzheimer\u27s Disease: A Possible Connection to Porphyria

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    Mechanisms that cause Alzheimer\u27s disease (AD), an invariably fatal neurodegenerative disease, are unknown. Important recent data indicate that neuronal heme deficiency may contribute to AD pathogenesis. If true, factors that contribute to the intracellular heme deficiency could potentially alter the course of AD. The porphyrias are metabolic disorders characterized by enzyme deficiencies in the heme biosynthetic pathway. We hypothesize that AD may differ significantly in individuals possessing the genetic trait for an acute hepatic porphyria. We elaborate on this hypothesis and briefly review the characteristics of the acute hepatic porphyrias that may be relevant to AD. We note the proximity of genes encoding enzymes of the heme biosynthesis pathway to genetic loci linked to sporadic, late-onset AD. In addition, we suggest that identification of individuals carrying the genetic trait for acute porphyria may provide a unique resource for investigating AD pathogenesis and inform treatment and management decisions

    Youth perceptions of how neighborhood physical environment and peers affect physical activity: a focus group study

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    Abstract Objective There is need for a youth-informed conceptualization of how environmental and social neighborhood contexts influence physical activity. We assessed youthsā€™ perceptions of their neighborhood physical and peer environments as affecting physical activity. Methods Thirty-three students (20 girls; ages 12-14 years) participated in focus groups about the physical environment and peers within their neighborhoods, and their understanding of how they affect physical activity. Results Inductive analysis identified themes of access (e.g., to equipment); aesthetics; physical and social safety; peer proximity and behavior (e.g., bullying); adult support or interference; and adult boundary setting. Participants also identified interconnections among themes, such as traffic shaping parent boundary setting and, in turn, access to physical spaces and peers. Conclusions Young adolescents view neighborhoods in ways similar to and different from adults. Examining physical and social environments in tandem, while mindful of how adults shape and youth perceive these environments, may enhance understanding of youth physical activity behavior

    Influence of the Spatial Distribution of Cationic Functional Groups at Nanoparticle Surfaces on Bacterial Viability and Membrane Interactions

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    While positively charged nanomaterials induce cytotoxicity in many organisms, much less is known about how the spatial distribution and presentation of molecular surface charge impact nanoparticleā€“biological interactions. We systematically functionalized diamond nanoparticle surfaces with five different cationic surface molecules having different molecular structures and conformations, including four small ligands and one polymer, and we then probed the molecular-level interaction between these nanoparticles and bacterial cells. Shewanella oneidensis MR-1 was used as a model bacterial cell system to investigate how the molecular length and conformation of cationic surface charges influence their interactions with the Gram-negative bacterial membranes. Nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS) demonstrate the covalent modification of the nanoparticle surface with the desired cationic organic monolayers. Surprisingly, bacterial growth-based viability (GBV) and membrane damage assays both show only minimal biological impact by the NPs functionalized with short cationic ligands within the concentration range tested, yet NPs covalently linked to a cationic polymer induce strong cytotoxicity, including reduced cellular viability and significant membrane damage at the same concentration of cationic groups. Transmission electron microscopy (TEM) images of these NP-exposed bacterial cells show that NPs functionalized with cationic polymers induce significant membrane distortion and the production of outer membrane vesicle-like features, while NPs bearing short cationic ligands only exhibit weak membrane association. Our results demonstrate that the spatial distribution of molecular charge plays a key role in controlling the interaction of cationic nanoparticles with bacterial cell membranes and the subsequent biological impact. Nanoparticles functionalized with ligands having different lengths and conformations can have large differences in interactions even while having nearly identical zeta potentials. While the zeta potential is a convenient and commonly used measure of nanoparticle charge, it does not capture essential differences in molecular-level nanoparticle properties that control their biological impact

    Drought-Ready Communities: A Guide to Community Drought Preparedness

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    Table of Contents Introduction to Drought-Ready Communities........................................................ 4 Section 1. Getting Started: Invite the Community to Participate, Commit to the Process...................... 7 1.1 Establish a leadership team that includes individuals with responsibility for monitoring, communication, and implementation .............................................. 7 1.2 Identify stakeholders or groups in the community that may need additional resources to participate in the Drought-Ready Communities process .................... 8 1.3 Include government agencies and regulators ....................................... 9 1.4 Develop a contact list ................................................................ 9 1.5 Gather community perceptions of drought .................................................. 10 Section 2. Information Gathering: Understand Water Sources and Uses, Develop a Drought History . 11 2.1 Identify water sources and uses ....................................................... 11 2.2 Learn how drought has affected the community in the past ........................ 12 2.3 Gather data on water and climate ................................................................. 13 2.4 List factors that affect the severity of drought impacts ..................................... 1
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