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  • 1
    Electronic Resource
    Electronic Resource
    INTEGRATED ECHO SOUNDER, GPS, AND GIS FOR RESERVOIR SEDIMENTATION STUDIES: EXAMPLES FROM TWO ARKANSAS LAKES (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 40 (2004), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Bathymetric and sedimentation surveys were conducted using a dual frequency (28/200 kHz) echo sounder system in two reservoirs (Lee Creek Reservoir and Lake Shepherd Springs) in the Ozark Plateau of northwestern Arkansas. Echo sounder survey data were merged within geographic information system (GIS) software to provide detailed visualization and analyses of current depths, pre-impoundment topography, distribution, thickness, and volume estimates of lacustrine sediment, time averaged sediment accumulation rates, long term average annual sediment flux, and water storage capacity. Calculated long term average sediment accumulation rates were used to model sediment infilling and projected lifetimes of each reservoir. Results from echo sounder surveys and GIS analyses suggest that the Lee Creek Reservoir has a projected lifetime of approximately 500 years compared to a projected lifetime for Lake Shepherd Springs of approximately 3,000 years. Estimated differences in projected lifetimes of these reservoirs reflected differences in initial reservoir volume and long term average annual sediment flux from the respective watersheds related to watershed area, physiography, land cover, and land use. The universal soil loss equation (USLE) model generated sediment fluxes an order of magnitude larger from the watersheds of both reservoirs compared to the geophysical data estimates. This study demonstrated the utility of merging geophysical survey (echo sounder) data within a GIS as an aid to understanding patterns of reservoir sedimentation. These data and analyses also provide a baseline relevant to understanding sedimentation processes and are necessary for development of long term management plans for these reservoirs and their watersheds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2004.tb01061.x
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  • 2
    Electronic Resource
    Electronic Resource
    Association of dwarfism and floral induction with a grape ‘green revolution’ mutation (2002)
    [s.l.] : Nature Publishing Group
    Nature 416 (2002), S. 847-850 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The transition from vegetative to reproductive growth is an essential process in the life cycle of plants. Plant floral induction pathways respond to both environmental and endogenous cues and much has been learnt about these genetic pathways by studying mutants of Arabidopsis. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/416847a
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  • 3
    Electronic Resource
    Electronic Resource
    Transcriptional co-activator PGC-1α drives the formation of slow-twitch muscle fibres (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 418 (2002), S. 797-801 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The biochemical basis for the regulation of fibre-type determination in skeletal muscle is not well understood. In addition to the expression of particular myofibrillar proteins, type I (slow-twitch) fibres are much higher in mitochondrial content and are more dependent on oxidative metabolism ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature00904
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  • 4
    Electronic Resource
    Electronic Resource
    Star formation Three's a crowd (2000)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 405 (2000), S. 405-407 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Looking at the night sky with the naked eye gives the impression that nearly all stars are single stars, much like our Sun. In reality, roughly half of these stars are binaries — two stars revolving around a common centre of mass. Studies of star formation have focused largely on single ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35013174
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  • 5
    Electronic Resource
    Electronic Resource
    Adipose-selective targeting of the GLUT4 gene impairs insulin action in muscle and liver (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 409 (2001), S. 729-733 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The earliest defect in developing type 2 diabetes is insulin resistance, characterized by decreased glucose transport and metabolism in muscle and adipocytes. The glucose transporter GLUT4 mediates insulin-stimulated glucose uptake in adipocytes and muscle by rapidly moving from intracellular ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35055575
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  • 6
    Electronic Resource
    Electronic Resource
    Extrasolar planets Giant giants or dwarf dwarfs? (2001)
    [s.l.] : Nature Publishing Group
    Nature 409 (2001), S. 462-463 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Planet hunters keep discovering yet more weird objects around nearby Sun-like stars that resemble nothing found in our own Solar System. The latest discoveries, announced at a meeting earlier this month*, include a three-body system that appears to be composed of a central star orbited by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35054155
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  • 7
    Electronic Resource
    Electronic Resource
    Barium antimonide oxide, Ba3Sb2O (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 503-504 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The antimonide oxide Ba3Sb2O consists of discrete [Sb2]4− and O2− anions, and crystallizes with a new structure type. The Sb—Sb distances are comparable to those known from electron-precise zintl phases and the tetrahedral coordination of the O2− anion is also observed in some other Ba-rich metallide oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270101002785
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  • 8
    Electronic Resource
    Electronic Resource
    Triggering Protostellar Collapse, Injection, and Disk Formation (2000)
    Springer
    Space science reviews 92 (2000), S. 13-22 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Certain meteoritical inclusions contain evidence for the existence of short-lived radioactivities such as 26Al and 41Ca at the time of their formation 4.566 billion years ago. Because the half-lives of these nuclides are so short, this evidence requires that no more than about a million years elapsed between their nucleosynthesis and their inclusion in cm-sized solids in the solar nebula. This abbreviated time span can be explained if these nuclides were synthesized in a stellar source such as a supernova, and were then transported across the interstellar medium by the resulting shock wave, which then triggered the gravitational collapse of the presolar molecular cloud core. Detailed 2D and 3D numerical hydrodynamical models are reviewed and show that such a scenario is consistent with the time scale constraint, and with the need to both trigger collapse and to inject shock-wave matter into the collapsing protostellar cloud and onto the protoplanetary disk formed by the collapse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005237031828
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  • 9
    Electronic Resource
    Electronic Resource
    Early Solar System Shock fronts in Hawaii (2004)
    [s.l.] : Nature Publishing Group
    Nature 432 (2004), S. 957-958 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The meteorites and comets that were formed in the solar nebula, the planet-forming disk of gas and dust that became our Solar System, have been largely unaltered over time, and their structure provides clues about the physical and chemical processes that occurred in the nebula. One group of early ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/432957a
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  • 10
    Electronic Resource
    Electronic Resource
    Adventures in Data Analysis: The TAO Array and the 1997–1998 El Niño (2000)
    Springer
    Mathematical geology 32 (2000), S. 159-185 
    Details
    ISSN: 1573-8868
    Keywords: El Niño—Southern Oscillation ; real time ; data analysis ; time series ; animation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Traditional undergraduate education in earth sciences does not emphasize data acquisition, analysis, or assessment. However, arrival of the information age dictates that earth sciences graduates be imbued with fundamental skills to organize, evaluate and process large data sets. Fortunately, the proliferation of remotely sensed data and its availability via the Internet provides many opportunities for earth science educators to meet these needs. Exercises to introduce students to data analysis have been designed utilizing data from the Tropical Atmosphere–Ocean (TAO) Array and the 1997–1998 El Niño episode in the tropical Pacific Ocean. The TAO Array is a grid of 69 buoys moored across the equatorial Pacific Ocean (8°N to 8°S and 95°W to 143°E) recording environmental data relevant to El Niño—Southern Oscillation (ENSO) processes. Data from the TAO Array is available in near-real-time (http://www.pmel.noaa.gov/toga-tao/realtime.html) or as archived ASCII files (http://www.pmel.noaa.gov/toga-tao/data-delivery.html) providing daily (sometimes hourly) records of environmental parameters for each buoy in the grid. Student exercises in data analysis begin with downloading data from buoy locations, parsing the data into spreadsheets, and organizing data by environmental parameter into yearly and monthly data sets. Analyses of reconstructed data include calculations of long-term averages of environmental parameters, seasonal climatologies, monthly climatologies and calculation of long-term, seasonal, and monthly anomalies. Finally, monthly anomaly maps produced by students are loaded sequentially into GIF-animation software to create time-series images illustrating the progress and development of the 1997–1998 El Niño event.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007523322222
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