3,529 research outputs found
Fish Community Analysis Using Multidirectional ROV Video Surveys in the Northwestern Gulf of Mexico
In this study, ROV surveys with multidirectional video were used to analyze the fish communities associated with artificial reef patches in the Rio Grande Valley artificial reef 13.7 km off the coast of South Padre Island, TX. Nine configurations of reef patches consisting of varying combinations and densities of concrete pyramid and low-profile modules were surveyed. The highest species diversity was found at patches with large deployments of both pyramids and low-profile modules. Total Red Snapper Lutjanus campechanus abundance did not differ between configurations, but the highest abundances of juvenile Red Snapper were found at configurations with one pyramid and one low-profile module and at the largest low-profile only sites. Negative correlations between juvenile Red Snapper and both Grey Triggerfish Balistes capriscus and adult Red Snapper were identified. The results of this study indicate that artificial reefs with separate habitat areas composed of 1) large deployments of mid-profile structures for older juvenile and adult Red Snapper and Grey Triggerfish and 2) isolated patches of low-profile habitat or a single mid-profile structure with associated low-profile habitat for small juvenile Red Snapper will be the most effective for fisheries enhancement and supporting diverse fish assemblages
The decline and fall of the multinational corporation: A typology of stages of corporate development.
A plant-made cholera toxin B subunit enhances mucosal wound healing and protects against ulcerative colitis and colon cancer.
This dissertation describes the previously unidentified effects of a plant-produced recombinant cholera toxin B subunit (CTBp) on the gastrointestinal (GI) tract and its ability to protect against inflammation in a mouse model of colonic injury and ulcerative colitis (UC). To comprehensively analyze CTBp’s impacts on the GI tract, we employed global analysis methodologies based on multi-color flow cytometry to analyze immune cell populations in GI and systemic lymphatic compartments, gene expression microarray to decipher transcript-level changes in the colon and small intestine, and 16S rRNA sequencing to characterize fecal microbiota. Based on a drastic shift observed in the immune cell profile and gene expression pattern in the distal colon, we built a new working hypothesis that CTBp may enhance mucosal protection in the colon. To address this hypothesis, we used the Caco-2 human colonic cell line and the mouse dextran sulfate sodium (DSS) colitis model. After demonstrating the potential of CTBp as a mucosal healing and anti-colitic agent, the dissertation will be summarized and future directions discussed
Mold In Buildings: Issues and Outcomes
Executive Summary This article will provide an introduction to mold species most commonly found in buildings, and will present potential health and safety effects of such species. Prevention and reasons behind growth of mold in facilities will be discussed, giving examples of both construction and operation prevention techniques. Finally, remediation guidelines and highlights will be presented. These topics will provide a basic understanding of current mold issues, allowing one to fully engage in discussion of the subsequent sections, where current legal issues involved with mold will be presented along with cases dealing with physical, legal, and financial implications of mold in buildings
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Evaluating the Impact of Double-Parked Freight Deliveries on Signalized Arterial Control Delay Using Analytical Models and Simulation
Freight deliveries on signalized urban streets are known to cause lane blockages during delivery. Traffic congestion associated with urban freight deliveries has gained increasing attention recently as traffic engineers and planners are tasked with finding solutions to manage increasing demand more sustainably with limited road capacity. The goal of this research is to evaluate two models for quantifying the capacity and signalized control delay effects of a lane-blocking freight delivery on an urban arterial. The two methods are: an All-or-Nothing model similar to methodology used in the Highway Capacity Manual 6th Edition, and a Detailed model consistent with kinematic wave theory. The purpose is to provide insight on the use of these tools for analysis of urban freight delivery. The signalized control delay results of the two models are compared with observed video data of urban deliveries from one city block of 8th Ave in New York City. Empirical confirmation of double-parked delivery impact on signalized controlled delay remains elusive due to an inability to isolate the effects of the deliveries from other traffic perturbations in the video sample. Instead, microscopic simulation using Aimsun is used for comparison to the theoretical models and the results lend credibility to the Detailed model. The simulation results show a similar trend of delay impact from double-parked deliveries located at a range distances from the intersection and more closely resembled the Detailed model. The All-or-Nothing model would provide only a coarse representation of the capacity and delay effects. The more detailed approach that accounts for the dynamics of queuing in front of the delivery vehicle provides closed form analytical formulas for capacity and signalized control delay that can account for varying locations of deliveries as well as analysis periods with some blocked cycles and others unblocked. Two policy implications are proposed: 1) that double-parked deliveries located mid-block likely result in less signalized control delay impact, and 2) freight receivers that attract double-parked deliveries near an intersection stop line should be prioritized in urban freight delivery mitigation policies such as off-hour delivery
Tweaking the Twenty-First Amendment: An Argument Against Durational-Residency Requirements for Alcohol Beverage Wholesalers and Retailers
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