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  • 1
    Electronic Resource
    Electronic Resource
    PREDICTING LOCAL TRAVEL IN URBAN REGIONS (1957)
    Oxford, UK : Blackwell Publishing Ltd
    Papers in regional science 3 (1957), S. 0 
    Details
    ISSN: 1435-5957
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1435-5597.1957.tb01599.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Book reviews (1990)
    Springer
    Review of industrial organization 5 (1990), S. 159-181 
    Details
    ISSN: 1573-7160
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02284681
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    Paper (German National Licenses)
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  • 3
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    A mass resolved, high resolution neutral particle analyzer for C-2U (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-07-20
    Description: C-2U is a high-confinement, advanced beam driven field-reversed configuration plasma experiment which sustains the configuration for 〉5 ms, in excess of typical MHD and fast particle instability times, as well as fast particle slowing down times. Fast particle dynamics are critical to C-2U performance and several diagnostics have been deployed to characterize the fast particle population, including neutron and proton detectors. To increase our understanding of fast particle behavior and supplement existing diagnostics, an E ∥ B neutral particle analyzer was installed, which simultaneously measures H 0 and D 0 flux with large dynamic range and high energy resolution. Here we report the commissioning of the E ∥ B analyzer, confirm the instrument has energy resolution Δ E / E ≲ 0 . 1 and a dynamic range E max / E min ∼ 30 , and present measurements of initial testing on C-2U.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Enhanced magnetic field probe array for improved excluded flux calculations on the C-2U advanced beam-driven field-reversed configuration plasma experiment (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-08-02
    Description: External flux conserving coils were installed onto the exterior of the C-2U [M. W. Binderbauer et al. , Phys. Plasmas 22 , 056110 (2015)] confinement vessel to increase the flux confinement time of the system. The 0.5 in. stainless steel vessel wall has a skin time of ∼5 ms. The addition of the external copper coils effectively increases this time to ∼7 ms. This led to better-confined/longer-lived field-reversed configuration (FRC) plasmas. The fringing fields generated by the external coils have the side effect of rendering external field measurements invalid. Such measurements were key to the previous method of excluded flux calculation [M. C. Thompson et al. , Rev. Sci. Instrum. 83 , 10D709 (2012)]. A new array of B-dot probes and Rogowski coils were installed to better determine the amount of flux leaked out of the system and ultimately provide a more robust measurement of plasma parameters related to pressure balance including the excluded flux radius. The B-dot probes are surface mountable chip inductors with inductance of 33 μ H capable of measuring the DC magnetic field and transient field, due to resistive current decay in the wall/coils, when coupled with active integrators. The Rogowski coils measure the total change in current in each external coil (150 A/2 ms). Currents were also actively driven in the external coils. This renders the assumption of total flux conservation invalid which further complicates the analysis process. The ultimate solution to these issues and the record breaking resultant FRC lifetimes will be presented.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    How much effort is required to accurately describe the complex ecology of a rodent-borne viral disease? (2016)
    Wiley
    In: Ecosphere
    Details
    Publication Date: 2016-06-28
    Description: We use data collected on 18, 1-ha live trapping grids monitored from 1994 through 2005 and on five of those grids through 2013 in the mesic northwestern United States to illustrate the complexity of the deer mouse ( Peromyscus maniculatus )/Sin Nombre virus (SNV) host-pathogen system. Important factors necessary to understand zoonotic disease ecology include those associated with distribution and population dynamics of reservoir species as well as infection dynamics. Results are based on more than 851,000 trap nights, 16,608 individual deer mice and 10,572 collected blood samples. Deer mice were distributed throughout every habitat we sampled and were present during every sampling period in all habitats except high altitude habitats over 1900 m. Abundance varied greatly among locations with peak numbers occurring mostly during fall. However, peak rodent abundance occurred during fall, winter and spring during various years on three grids trapped 12 months/yr. Prevalence of antibodies to SNV averaged 3.9% to 22.1% but no grids had mice with antibodies during every month. The maximum period without antibody-positive mice ranged from 1 to 52 months, or even more at high altitude grids where deer mice were not always present. Months without antibody-positive mice were more prevalent during fall than spring. Population fluctuations were not synchronous over broad geographic areas and antibody prevalences were not well spatially consistent, differing greatly over short distances. We observed an apparently negative, but nonstatistically significant relationship between average antibody prevalence and average deer mouse population abundance and a statistically significant positive relationship between the average number of antibody positive mice and average population abundance. We present data from which potential researchers can estimate the effort required to adequately describe the ecology of a rodent-borne viral system. We address different factors affecting population dynamics and hantavirus antibody prevalence and discuss the path to understanding a complex rodent-borne disease system as well as the obstacles in that path.
    Electronic ISSN: 2150-8925
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Wiley on behalf of The Ecological Society of America (ESA).
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  • 6
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    Multi-channel Doppler backscattering measurements in the C-2 field reversed configurationa) (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-06
    Description: A versatile heterodyne Doppler Backscattering (DBS) system is used to measure density fluctuation levels (in the wavenumber range kρ s ≤ 50), and the toroidal E × B flow velocity in the C-2 Field-Reversed Configuration (FRC). Six tunable frequencies in three waveguide bands (26 GHz ≤ f ≤ 90 GHz) are launched using monostatic beam optics, via a quasi-optical beam combiner/polarizer and an adjustable parabolic focusing mirror (inside the vacuum enclosure) achieving Gaussian beam spot sizes of 3–5.5 cm at the X/O-mode cutoff. The DBS system covers plasma densities of 0.8 × 10 13 ≤ n e ≤ 1 × 10 14 cm −3 , and provides access to the FRC core (up to the field null) and across the FRC separatrix into the scrape-off layer plasma.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics (AIP)
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  • 7
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    Tick-, mosquito-, and rodent-borne parasite sampling designs for the National Ecological Observatory Network (2016)
    Yuri P. Springer, David Hoekman, Pieter T. J. Johnson, Paul A. Duffy, Rebecca A. Hufft, David T. Barnett, Brian F. Allan, Brian R. Amman, Christopher M. Barker, Roberto Barrera, Charles B. Beard, Lorenza Beati, Mike Begon, Mark S. Blackmore, William E. Bradshaw, Dustin Brisson, Charles H. Calisher, James E. Childs, Maria A. Diuk-Wasser, Richard J. Douglass, Rebecca J. Eisen, Desmond H. Foley, Janet E. Foley, Holly D. Gaff, Scott L. Gardner, Howard S. Ginsberg, Gregory E. Glass, Sarah A. Hamer, Mary H. Hayden, Brian Hjelle, Christina M. Holzapfel, Steven A. Juliano, Laura D. Kramer, Amy J. Kuenzi, Shannon L. La; Deau, Todd P. Livdahl, James N. Mills, Chester G. Moore, Serge Morand, Roger S. Nasci, Nicholas H. Ogden, Richard S. Ostfeld, Robert R. Parmenter, Joseph Piesman, William K. Reisen, Harry M. Savage, Daniel E. Sonenshine, Andrea Swei, Michael J. Yabsley
    Wiley
    In: Ecosphere
    Details
    Publication Date: 2016-05-26
    Description: Parasites and pathogens are increasingly recognized as significant drivers of ecological and evolutionary change in natural ecosystems. Concurrently, transmission of infectious agents among human, livestock, and wildlife populations represents a growing threat to veterinary and human health. In light of these trends and the scarcity of long-term time series data on infection rates among vectors and reservoirs, the National Ecological Observatory Network (NEON) will collect measurements and samples of a suite of tick-, mosquito-, and rodent-borne parasites through a continental-scale surveillance program. Here, we describe the sampling designs for these efforts, highlighting sampling priorities, field and analytical methods, and the data as well as archived samples to be made available to the research community. Insights generated by this sampling will advance current understanding of and ability to predict changes in infection and disease dynamics in novel, interdisciplinary, and collaborative ways.
    Electronic ISSN: 2150-8925
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Wiley on behalf of The Ecological Society of America (ESA).
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  • 8
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    Expression of a cloned rat brain potassium channel in Xenopus oocytes (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-04-14
    Description: Potassium channels are ubiquitous membrane proteins with essential roles in nervous tissue, but little is known about the relation between their function and their molecular structure. A complementary DNA library was made from rat hippocampus, and a complementary DNA clone (RBK-1) was isolated. The predicted sequence of the 495-amino acid protein is homologous to potassium channel proteins encoded by the Shaker locus of Drosophila and differs by only three amino acids from the expected product of a mouse clone MBK-1. Messenger RNA transcribed from RBK-1 in vitro directed the expression of potassium channels when it was injected into Xenopus oocytes. The potassium current through the expressed channels resembles both the transient (or A) and the delayed rectifier currents reported in mammalian neurons and is sensitive to both 4-aminopyridine and tetraethylammonium.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Christie, M J -- Adelman, J P -- Douglass, J -- North, R A -- DA03160/DA/NIDA NIH HHS/ -- DA03161/DA/NIDA NIH HHS/ -- DA04154/DA/NIDA NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1989 Apr 14;244(4901):221-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Vollum Institute, Oregon Health Sciences University, Portland 97201.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2539643" target="_blank"〉PubMed〈/a〉
    Keywords: 4-Aminopyridine ; Amino Acid Sequence ; Aminopyridines/pharmacology ; Animals ; Base Sequence ; Brain/*metabolism ; Cloning, Molecular ; Membrane Potentials ; Membrane Proteins/genetics ; Molecular Sequence Data ; Oocytes/*metabolism ; Potassium/physiology ; Potassium Channels/drug effects/*metabolism ; Rats ; Tetraethylammonium ; Tetraethylammonium Compounds/pharmacology ; Xenopus
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Two mammalian genes transcribed from opposite strands of the same DNA locus (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-03-20
    Description: This report describes the characterization of a genomic locus in the rat that encodes overlapping genes occupying both strands of the same piece of DNA. One gene (strand) encodes gonadotropin-releasing hormone (GnRH). A second gene, SH, is transcribed from the other DNA strand to produce RNA of undefined function. The RNAs transcribed from each DNA strand are spliced and polyadenylated, and share significant exon domains. GnRH is expressed in the central nervous system while SH transcripts are present in the heart. Thus, the genome of a mammalian organism encodes two distinct genes by using both strands of the same DNA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Adelman, J P -- Bond, C T -- Douglass, J -- Herbert, E -- AM-16879/AM/NIADDK NIH HHS/ -- AM-30155/AM/NIADDK NIH HHS/ -- DA-02736/DA/NIDA NIH HHS/ -- New York, N.Y. -- Science. 1987 Mar 20;235(4795):1514-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3547652" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; DNA/*genetics ; Exons ; *Genes ; Gonadotropin-Releasing Hormone/*genetics ; Heart/physiology ; Hypothalamus/physiology ; Introns ; RNA Splicing ; RNA, Messenger/*genetics ; Rats ; Templates, Genetic ; Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    A damped precipitation-driven, bottom-up model for deer mouse population abundance in the northwestern United States (2017)
    Wiley
    Details
    Publication Date: 2017-11-17
    Description: Small-mammal population densities can be regulated by bottom-up (food availability) and top-down (predation) forces. In 1993, an El Niño Southern Oscillation event was followed by a cluster of human hantavirus with pulmonary syndrome in the southwestern United States. An upward trophic cascade hypothesis was proposed as an explanation for the outbreak: Increased plant productivity as a consequence of El Niño precipitations led to an unusual increase in distribution and abundance of deer mice ( Peromyscus maniculatus ; reservoir host of Sin Nombre virus). Could such drastic events occur in mesic habitats, where plant productivity in response to climate conditions is likely to be much less dramatic? In this work, we investigate to what extent deer mouse populations follow a precipitation-driven, bottom-up model in central and western Montana and discuss important conditions for such a model to be possible. We found positive correlations between deer mouse abundance and on-the-ground measured plant productivity with a several-month lag in three of six study sites. This effect was weaker when deer mouse populations were more abundant, indicating density-dependent effects. Dispersal resulting from territoriality may be important in attenuating local density increments in spite of high food availability. In addition, there is evidence that population abundance in the study area could respond to other abiotic factors. In particular, precipitation in the form of snow may reduce deer mice survival, thus compensating the benefits of improved plant productivity. Deer mouse populations in Montana study sites follow complex dynamics determined by multiple limiting factors, leading to a damped precipitation-driven bottom-up regulation. This prevents dramatic changes in rodent abundances after sudden increments of food availability, such as those observed in other regions. We investigated a damped precipitation-driven, bottom-up model for deer mouse population abundance in the northwestern United States. Plant productivity, measured directly, affected deer mouse abundance at some sites. The productivity effect was damped by density-dependent social responses within the deer mouse populations.
    Electronic ISSN: 2045-7758
    Topics: Biology
    Published by Wiley
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