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  • 1
    Electronic Resource
    Electronic Resource
    Applications of satellite remote sensing to forested ecosystems (1989)
    Springer
    Landscape ecology 3 (1989), S. 131-143 
    Details
    ISSN: 1572-9761
    Keywords: satellite ; remote sensing ; forest ecosystems ; GIS ; monitoring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Since the launch of the first civilian earth-observing satellite in 1972, satellite remote sensing has provided increasingly sophisticated information on the structure and function of forested ecosystems. Forest classification and mapping, common uses of satellite data, have improved over the years as a result of more discriminating sensors, better classification algorithms, and the use of geographic information systems to incorporate additional spatially referenced data such as topography. Land-use change, including conversion of forests for urban or agricultural development, can now be detected and rates of change calculated by superimposing satellite images taken at different dates. Landscape ecological questions regarding landscape pattern and the variables controlling observed patterns can be addressed using satellite imagery as can forestry and ecological questions regarding spatial variations in physiological characteristics, productivity, successional patterns, forest structure, and forest decline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00131175
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  • 2
    Electronic Resource
    Electronic Resource
    A Gis-derived integrated moisture index to predict forest composition and productivity of Ohio forests (U.S.A.) (1997)
    Springer
    Landscape ecology 12 (1997), S. 331-348 
    Details
    ISSN: 1572-9761
    Keywords: landscape ecology ; site index ; topography ; Ohio ; oak-hickory forests ; integrated moisture index ; GIS ; spatial distribution ; forest composition ; DEM ; resolution ; scale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A geographic information system (GIS) approach was used in conjunction with forest-plot data to develop an integrated moisture index (IMI), which was then used to predict forest productivity (site index) and species composition for forests in Ohio. In this region, typical of eastern hardwoods across the Midwest and southern Appalachians, topographic aspect and position (rather than elevation) change drastically at the fine scale and strongly influence many ecological functions. Elevational contours, soil series mapping units, and plot locations were digitized for the Vinton Furnace Experimental Forest in southeastern Ohio and gridded to 7.5-m cells for GIS modeling. Several landscape features (a slope-aspect shading index, cumulative flow of water downslope, curvature of the landscape, and water-holding capacity of the soil) were used to create the IMI, which was then statistically analyzed with site-index values and composition data for plots. On the basis of IMI values for forest land harvested in the past 30 years, we estimated oak site index and the percentage composition of two major species groups in the region: oak (Quercus spp.), and yellow poplar (Liriodendron tulipifera) plus black cherry (Prunus serotina). The derived statistical relationships were then applied in the GIS to create maps of site index and composition, and verified with independent data. The maps show the oaks will dominate on dry, ridge top positions (i.e., low site index), while the yellow poplar and black cherry will predominate on mesic sites. Digital elevation models with coarser resolution (1:24K, 1:100K, 1:250K) also were tested in the same manner. We had generally good success for 1:24K, moderate success for 1:100K, but no success for 1:250K data. This simple and portable approach has the advantage of using readily available GIS information which is time-invariant and requires no fieldwork. The IMI can be used to better manage forest resources where moisture is limiting and to predict how the resource will change under various forms of ecosystem management.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007989813501
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  • 3
    Electronic Resource
    Electronic Resource
    Heat sensitivity of Hela S3 Cell DNA topoisomerase II (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 159 (1994), S. 468-474 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The sensitivity of HeLa DNA topoisomerase II to 45°C heat shock was measured both in the intact cell and in vitro. In the intact cell, DNA topoisomerase II activity was estimated by measuring the formation and reversal of enzyme-DNA cleavable complexes by alkaline filter elution of cells exposed to the enzyme poison 4′-(9-acridinylamino)(methanesulfon-m-anisidide). In vitro enzymatic activity was estimated by measuring changes in the topological state of plasmid and kinetoplast DNA produced by sonicates of nuclei from previously heated cells. The capacity of the enzyme to form, or reverse, enzyme-DNA cleavable complexes was inactivated during 45°C heating with a reciprocal slope of 120 or 15 min, respectively. In vitro estimates of the activity of the enzyme from previously heated cells indicated that the enzyme was inactivated with a reciprocal slope of 99, 45, and 21 min after 45, 46 and 47°C heating, respectively. DNA topoisomerase I activity was inactivated with a reciprocal slope of 130 min at 45°C. The cumulative results indicate that during 45°C heat shock, thermal inactivation of neither DNA topoisomerase I nor II is rate limiting for either cell survival or for DNA replication. While DNA topoisomerase II is resistant in situ to heat inactivation, in vivo assays indicate that the enzyme's capacity to function in the intact cell may be compromised by hyperthermic changes in the enzyme's environment. © 1994 wiley-Liss, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041590311
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