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  • 1
    Electronic Resource
    Electronic Resource
    Remote sensing of riverine landscapes (2002)
    Oxford UK : Blackwell Science Ltd.
    Freshwater biology 47 (2002), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The fashion for examining riverine landscapes is changing as our technical instruments, from microprobes to satellites, expands to be able to examine the spatial and temporal relationships among biota, hydrology and geomorphology across scales from microhabitats to channel units to valleys to catchments.2. The range of successful applications from remote sensing analyses of riverine landscapes has especially increased with the launch of many new instruments that record data across the electromagnetic spectrum. Engineering of the instruments has also improved such that knowledge of the radiometric properties of the digital data is more complete as a result of better instrumentation and installation of on-board calibrations systems for many instruments.3. With the development of faster processing on cheaper computers, it is now common for comprehensive data sets to be processed through algorithms that previously could only be applied to relatively small (〈1 Mbyte) rasters of data. This technical advance is especially important for the statistical algorithms such as principal components and spectral mixture analysis that can decompose gradients in the spectral data. The combined effect is the production of regional views of riverine landscapes separated into components of water, vegetation and soil.4. The landscape properties of riverine landscapes that have been most successfully measured with remote sensing data include community and habitat level classification and connectivity of waterbodies with optical and radar data. Laser and radar altimetric data measured from aircraft provide land elevations at resolutions as fine as decimetres. A remaining challenge is to achieve an exact match between the categories of landscape classification from the remote sensing analysis and data from field surveys or model outputs.5. In contrast to many landscape properties, several water properties are now routinely measured as absolute values (water surface elevation, temperature, surface sediment concentration and algal concentration) with remote sensing. New analyses of both passive and active radar data in addition have led to measurements of inundation and wetness that are providing valuable insight into the dynamics of flooding and its effect on riverine landscapes.6. Finally, an effective examination of the variability in landscape cover includes additional analyses of remote sensing products using pattern metrics that measure the scale of patchiness and distribution of the landscape properties. These types of variability measures at the regional scale contribute to an increased understanding of the way in which spatial heterogeneity of riverine landscapes varies across scales and how landscape filters (sensu Poff, 1997) influence the evolution of these diversity patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2002.00909.x
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  • 2
    Electronic Resource
    Electronic Resource
    Interferometric radar measurements of water level changes on the Amazon flood plain (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 404 (2000), S. 174-177 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Measurements of water levels in the main channels of rivers, upland tributaries and floodplain lakes are necessary for understanding flooding hazards, methane production, sediment transport and nutrient exchange. But most remote river basins have only a few gauging stations and these tend ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35004560
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  • 3
    Electronic Resource
    Electronic Resource
    Antioxidant effects of estradiol and 2-hydroxyestradiol on iron-induced lipid peroxidation of rat liver microsomes
    Amsterdam : Elsevier
    Steroids 59 (1994), S. 383-388 
    Details
    ISSN: 0039-128X
    Keywords: 2-hydroxyestradiol ; antioxidant action ; estradiol ; microsomal lipid peroxidation ; steroids
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0039-128X(94)90006-X
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  • 4
    Electronic Resource
    Electronic Resource
    Activities of some glycolytic enzymes in the major salivary glands of some laboratory animals
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part A: Physiology 47 (1974), S. 399-402 
    Details
    ISSN: 0300-9629
    Keywords: Salivary glands ; glycolytic enzymes ; parotid ; sublingual ; submaxillary
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0300-9629(74)90001-2
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  • 5
    Electronic Resource
    Electronic Resource
    Petrological and Sr-Nd evidence bearing on Early Proterozoic magmatic events of the subcontinental mantle: Sao Francisco craton (Uaua, NE-Brazil) (1995)
    Springer
    Contributions to mineralogy and petrology 122 (1995), S. 252-261 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract : Early Proterozoic (2.0–2.4 Ga), unmetamorphosed mafic dykes intrude Archean (3.1–2.7 Ga) terrains of the northern Sao Francisco craton (Uaua, NE-Brazil). The dykes are composed of evolved [atomic Mg/(Mg+Fe2)〈0.6] two-pyroxene quartz tholeiites, the compositional variations of which are compatible with gabbro fractionation from different parental melts. The incompatible trace-element patterns indicate that the parental melts derived from partial melting of chemically heterogeneous garnet peridotite sources. Geochemistry and Sr-Nd isotopes imply some contamination of the Uaua dyke magma by continental crustal components during emplacement. Sr-isotopes suggest that the “uncontaminated” dykes may be related to time-integrated depleted mantle materials, while Nd-isotopes suggest mantle sources similar to the bulk Earth composition. The “uncontaminated” dykes have a positive Nb-anomaly and incompatible element contents which do not support appreciable enrichment of large ion lithophile and light rare earth elements in the source(s) throughmantle metasomatism and/or crustal components related to dehydration of a subducting slab, and an anorogenic ensialic emplacement is inferred. The Uaua dykes are chemically and isotopically distinct from the Early–Middle Proterozoic (1.9–1.7 Ga) unmetamorphosed dykes from W-Uruguay (Rio de La Plata craton) which are believed to have originated from different garnet peridotite sources. This suggests that Uaua–Uruguay compositional differences may reflect different Archean mantle differentiation and evolution of the cratonization processes. If this possibility proves to be correct, then magma genesis from various South American cratons would be by independent cratonic processes and their imprints on the subcratonic mantle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004100050125
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  • 6
    Electronic Resource
    Electronic Resource
    Iron-manganese interaction and its relation to boron levels in tomato plants (1980)
    Springer
    Plant and soil 55 (1980), S. 377-388 
    Details
    ISSN: 1573-5036
    Keywords: Boron ; Iron ; Manganese ; Tomato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Using a factorial design with deficient to toxic levels of Mn and B, the absorption and distribution of Fe in tomato plants (Lycopersicum esculentum, var. Marglobe), grown hydroponically in a greenhouse was studied. B was added to disturb growth and hence nutrient demands. Deficient or normal Mn levels antagonize Fe absorption, but the reverse was true when Mn reached toxic values; nevertheless, Mn effect was always antagonistic on Fe transport. A hypothesis for explaining the above-related results, together with P and Ca absorption and distribution, is proposed. Mn/Fe in the shoot is not related at all with plant growth. B levels influence Fe absorption and translocation paralleling the dry matter production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182698
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of iron on the absorption and translocation of manganese (1974)
    Springer
    Plant and soil 41 (1974), S. 429-434 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Iron supply influences the amount of manganese absorbed by plants. When it is low, increased manganese uptake and translocation occurs. However, with excessive iron supply an increase in manganese uptake results, but not in its translocation. Manganese uptake is diminished under conditions of very low iron availability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185806
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  • 8
    Electronic Resource
    Electronic Resource
    Coffee shade with Mimosa scabrella Benth. for frost protection in southern Brazil (1996)
    Springer
    Agroforestry systems 33 (1996), S. 205-214 
    Details
    ISSN: 1572-9680
    Keywords: bracatinga ; leaf area ; radiative frost ; shading
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Damage by radiative frosts is a major limiting factor for coffee cultivation in southern Brazil (south of 20° S latitude). The use of Mimosa scabrella (bracatinga) as a shade tree, to modify the local energy balance and thus prevent damage to the coffee plants, has been evaluated from 1986 to 1994. The study was carried out near Londrina, Parana State (23°23' S, 51°11′ W). During the experimental period, several radiative frosts with intensity ranging from moderate to very severe occurred at the site. Minimum coffee leaf temperatures during these events were 2 to 4 °C higher in the shaded plots. Due to frost protection, coffee bean yields on the average of 7 harvests were higher on the shaded plots. The potential of this system for frost protection in southern Brazil is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00055423
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  • 9
    Electronic Resource
    Electronic Resource
    Iron deficiency in pea plants effect on catalase, peroxidase, chlorophyll and proteins of leaves (1978)
    Springer
    Plant and soil 49 (1978), S. 343-353 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Pea plants (Pisum sativum L., var. Lincoln) were grown in nutrient cultures at 4 levels of iron, 0.60 ppm (low), 0.96 ppm (low), 3.0 ppm (normal) and 30 ppm (excess) for 45 days. Leaf extracts were assayed for chlorophyll, proteins, catalase and peroxidase activities. Catalase and chlorophyll were closely related to iron supply. An inverse relationship was observed between peroxidase and catalase activities. Peroxidase was increased both at dificiency and excess iron levels, but was depressed at normal iron supply. The peroxidase/catalase ratio varied with iron supply and showed a minimum value of about 39 at 15 and 30 days growth, at adequate iron supplies. Measurement of catalase activity and the use of peroxidase/catalase ratios appear to be helpful in identifying iron deficiencies in peas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02149743
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  • 10
    Electronic Resource
    Electronic Resource
    Computerised analysis of urological parameters (1988)
    Springer
    Medical & biological engineering & computing 26 (1988), S. 325-327 
    Details
    ISSN: 1741-0444
    Keywords: Computers ; Urodynamics ; Urology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447090
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