720 research outputs found

    A key to selected rockfishes (Sebastes spp.) based on mitochondrial DNA restriction fragment analysis

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    Larval and juvenile rockfishes (Sebastes spp.) are difficult to identify using morphological characters. We developed a key based on sizes of restriction endonuclease fragments of the NADH dehydrogenase-3 and -4 (ND3/ND4) and 12S and 16S ribosomal RNA (12S/16S) mitochondrial regions. The key makes use of variation in the ND3/ND4 region. Restriction endonuclease Dde I variation can corroborate identifications, as can 12S/16S variation. The key, based on 71 species, includes most North American taxa, several Asian species, and Sebastolobus alascanus and Helicolenus hilgendorfi that are closely related to rockfishes. Fifty-eight of 71 rockfish species in our database can be distinguished unequivocally, using one to five restriction enzymes; identities of the remaining species are narrowed to small groups: 1) S. polyspinis, S. crameri, and S. ciliatus or variabilis (the two species could not be distinguished and were considered as a single species) ; 2) S. chlorostictus, S. eos, and S. rosenblatti; 3) S. entomelas and S. mystinus; 4)S. emphaeus, S. variegatus, and S. wilsoni; and 5) S. carnatus and S. chrysomelas

    Bacterial Adaptor Membrane Fusion Proteins and the Structurally Dissimilar Outer Membrane Auxiliary Proteins Have Exchanged Central Domains in α-Proteobacteria

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    Transport systems frequently include auxiliary proteins that perform subfunctions within the transporter protein complex. Two such proteins found in Gram-negative bacteria are the Membrane Fusion Proteins (MFPs) and the Outer Membrane Auxiliary (OMA) proteins. We here demonstrate that OMAs present in α-proteobacteria (but not in other bacterial types) contain a long α-helical region that is homologous to corresponding regions in the MFPs. The results suggest that during their evolution, OMAs, specifically from α-proteobacteria, exchanged their own α-helical domain for one derived from an MFP. The structural and functional implications of these findings are discussed

    Revitalization: Creating new architecture from remnants

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    While it may seem appropriate to overlook the old for the new, is it possible to sustain our ecosystem in this manner? The choices we make impact our environment and those within it. Instead of relying on the novelty of the new, we should look to our inadequacies to give us greater opportunities. For we can achieve this through revitalization. By using revitalization, we have the opportunity to imbue something with new life and vitality. Revitalization in architecture can serve as a means to stabilize and perform for the greatest benefit to our ecosystem. We should look to revitalization in architecture as part of any design solution. It is our responsibility to imbue a decaying community with the chance at a new beginning. It is our responsibility to examine the existing framework of our cities as a solution to our design challenges. This is the design doctrine that we explored in our senior capstone projects. One approach to revitalization is an integrated urban remodeling concept that meets the complex needs of an area. Another approach is to shift the associated function of inoperative infrastructure into a commodity for community and ecosystem. Another approach explores the unification of modernity and historic memento to elicit the resurgence of the architecture’s potential. These approaches showed that revitalization is a viable part of architectural design

    Transport and Elastic Properties of Fractal Media

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    We investigate the influence of fractal structure on material properties. We calculate the statistical correlation functions of fractal media defined by level-cut Gaussian random fields. This allows the modeling of both surface fractal and mass fractal materials. Variational bounds on the conductivity, diffusivity and elastic moduli of the materials are evaluated. We find that a fractally rough interface has a relatively strong influence on the properties of composites. In contrast a fractal volume (mass) has little effect on material properties.Comment: 10 pages, 6 figure

    The Low Arousal approach: a Practitioners Guide, Special Report

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    This new report explores the Low Arousal Approach to managing challenging behaviour, with particular reference as to how it can be implemented to work with autistic people

    Heart rate and cardiovascular responses to commercial flights: relationships with physical fitness

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    The aim of this study was to examine the influence of physical fitness on cardiac autonomic control in passengers prior to, during and following commercial flights. Twenty-two, physically active men (36.4 +/- 6.4 years) undertook assessments of physical fitness followed by recordings of 24-h heart rate (HR), heart rate variability (HRV), and blood pressure (BP) on a Control (no flight) and Experimental (flight) day. Recordings were analyzed using a two-way analysis of variance for repeated measures with relationships between variables examined via Pearson product moment correlation coefficients. Compared to the Control day, 24-h HR was significantly greater (>7%) and HRV measures (5-39%) significantly lower on the Experimental day. During the 1-h flight, HR (24%), and BP (6%) were increased while measures of HRV (26-45%) were reduced. Absolute values of HRV during the Experimental day and relative changes in HRV measures (Control-Experimental) were significantly correlated with measures of aerobic fitness (r = 0.43 to 0.51;-0.53 to -0.52) and body composition (r = -0.63 to -0.43; 0.48-0.61). The current results demonstrated that short-term commercial flying significantly altered cardiovascular function including the reduction of parasympathetic modulations. Further, greater physical fitness and lower body fat composition were associated with greater cardiac autonomic control for passengers during flights. Enhanced physical fitness and leaner body composition may enable passengers to cope better with the cardiovascular stress and high allostatic load associated with air travel for enhanced passenger well-being
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