Pullman, Washington, United States

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School of Mechanical and Materials Engineering
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School of Electrical Engineering and Computer Science
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College of Nursing
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Publication History View all

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    ABSTRACT: Pentalonia nigronervosa (sensu Hardy 1931) samples from banana and from Zingiberaceae and Araceae species exhibit fixed differences in DNA sequence in mitochondrial cytochrome oxidase subunit 1 ("DNA barcode") and in the nuclear gene elongation factor 1α, and have morphometric differences, including non-overlapping ranges in the length of the distal rostral segment. It is thus proposed that the name P. nigronervosa Coquerel be restricted to banana-feeding 'nigronervosa' specimens, and that the name Pentalonia caladii van der Goot be restored to full species status for specimens typically feeding on Zingiberaceae and Araceae.
    Zootaxa 06/2016;
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    ABSTRACT: We study the potential economic impacts of a hypothetical economic integration between South Korea and North Korea by calibrating a model of productivity catch-up. We analyze how the event would affect macro aggregates, including GDPs, total factor productivities (TFPs), wage rates, and interest rates. We begin by measuring the speed of TFP convergence of Eastern Germany towards Western Germany following their 1990 reunification. We then account for the larger population and lower output of North Korea relative to South Korea, compared to the equivalent ratios for East Germany relative to West Germany. After economic integration, South Korea is anticipated to make wealth transfers to and absorb migrating workers from the North. Such transfers and migration, along with declining TFP growth, would lead South Korean per-capita GDP to decline by about 20% in 25 years.
    Asian Economic Papers 06/2015; 14(2). DOI:10.1162/ASEP_a_00364
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    ABSTRACT: Environmental DNA (eDNA) degradation is a primary mechanism limiting the detection of rare species using eDNA techniques. To better understand the environmental drivers of eDNA degradation, we conducted a laboratory experiment to quantify degradation rates. We held bullfrog (Lithobates catesbeianus) tadpoles in microcosms, then removed the tadpoles and assigned the microcosms to three levels each of temperature, ultraviolet B (UV-B) radiation, and pH in a full factorial design. We collected water samples from each microcosm at six time steps (0 to 58 days). In all microcosms, most degradation occurred in the first three to 10 days of the experiment, but eDNA remained detectable after 58 days in some treatments. Degradation rates were lowest under cold temperatures (5 °C), low UV-B levels, and alkaline conditions. Higher degradation rates were associated with factors that contribute to favorable environments for microbial growth (higher temperatures, neutral pH, moderately high UV-B), indicating that the effects of these factors may be biologically mediated. The results of this experiment indicate that aquatic habitats that are colder, more protected from solar radiation, and more alkaline are likely to hold detectable amounts of eDNA longer than those that are warmer, sunnier, and neutral or acidic. These results can be used to facilitate better characterization of environmental conditions that reduce eDNA persistence, improved design of temporal sampling intervals and inference, and more robust detection of aquatic species with eDNA methods.
    Biological Conservation 03/2015; 183. DOI:10.1016/j.biocon.2014.11.038

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Nanotechnology 01/2001; 12(1):21. DOI:10.1088/0957-4484/12/1/305
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