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  • 1
    Electronic Resource
    Electronic Resource
    The effects of elevated temperature on the photosynthetic efficiency of zooxanthellae in hospite from four different species of reef coral: a novel approach (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 19 (1996), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Bleaching of reef corals is a phenomenon linked to temperature stress which involves loss of the symbiotic algae of the coral, which are known as zooxanthellae, and/or loss of algal pigments. The photosynthetic efficiency of zooxanthellae within the corals Montastrea annularis, Agaricia lamarki, Agaricia agaricites and Siderastrea radians was examined by pulse-amplitude modulation fluorometry (PAM) during exposure to elevated temperatures (30–36°C). Zooxanthellae within M. annularis and A. lamarki were found to be more sensitive to elevated temperature, virtually complete disruption of photosynthesis being noted during exposure to temperatures of 32 and 34°C. The photosynthetic efficiency of zooxanthellae within S. radians and A. agaricites decreased to a lesser extent. Differences in the loss of algal cells on an aerial basis and in the cellular chlorophyll concentration were also found between these species. By combining the non-invasive PAM technique with whole-cell fluorescence of freshly isolated zooxanthellae, we have identified fundamental differences in the physiology of the symbionts within different species of coral. Zooxanthellae within M. annularis appear to be more susceptible to heat-induced damage at or near the reaction centre of Photosystem II, while zooxanthellae living in S. radians remain capable of dissipating excess excitation energy through non-photochemical pathways, thereby protecting the photosystem from damage during heat exposure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1996.tb00251.x
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  • 2
    Electronic Resource
    Electronic Resource
    Veränderungen der Energie- und Nährstoffaufnahme der Bevölkerung im ersten Jahr der deutschen Einheit — Ergebnisse einer Modellstudie in Potsdam (1996)
    Springer
    European journal of nutrition 35 (1996), S. 150-156 
    Details
    ISSN: 1436-6215
    Keywords: Energie- und Nährstoffaufnahme ; Trends ; Bedeutung einzelner Lebensmittel-gruppen ; Modellstudie ; neue Bundesländer ; Intake of energy and nutrients ; trends ; importance of several food groups ; model study ; new German States
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary A nutritional model study was carried out in Potsdam from December 1990 until December 1991 involving 222 persons at the beginning. Changes of the energy and nutrient intake were evaluated. The trends established in 1991 — demonstrated by means of two specific trend parameters — have been discussed with regard to the results of the nutritional situation in the former GDR. First signs for an improvement of nutritional situation were visible (e.g., increase of consumption of vitamin A, ascorbic acid and calcium as well as decrease of consumption of energy and cholesterol).
    Notes: Zusammenfassung Eine von Ende 1990 bis Ende 1991 in Potsdam durchgeführte Modellstudie an anfangs 222 Personen wurde unter dem Aspekt von Veränderungen der Energie- und Nährstoffaufnahme ausgewertet. Die für 1991 ermittelten Trends — dargestellt durch 2 spezifische Trendparameter — wurden unter Beachtung von Ergebnissen über die Ernährungssituation in der ehemaligen DDR diskutiert. Ansätze zu einer Verbesserung der Ernährungssituation wurden sichtbar (z.B. Verzehrszunahmen bei Vitamin A, Vitamin C und Calcium sowie -abnahmen bei Energie und Cholesterin).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01622863
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental results on muon-catalyzed dt fusion (1996)
    Springer
    Hyperfine interactions 101-102 (1996), S. 67-80 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comprehensive experimental study of the kinetics of muon-catalyzed dt fusion has been conducted at PSI, based on the measurement of the 14 MeV neutrons from the fusion process. The target conditions included densities from 1–150% of the atomic density of liquid hydrogen, relative tritium concentrations of 2–95%, and temperatures of 13–300 K. Information about the dt cycle has been obtained from the measured neutron time distributions by different methods: Monte Carlo simulations primarily aimed at investigating epithermal effects in molecular formation and the determination and interpretation of cycling rates describing the steady state regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02227607
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  • 4
    Electronic Resource
    Electronic Resource
    Geostatistical regionalization of glacial aquitard thickness in northwestern Germany, based on fuzzy kriging (1996)
    Springer
    Mathematical geology 28 (1996), S. 437-452 
    Details
    ISSN: 1573-8868
    Keywords: geostatistics ; regionalization ; fuzzy ; kriging ; hydrogeology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract In many instances hydrogeological parameters obtained by conventional methods for selected localities within an aquifer or an aquitard are not sufficient for adequate regionalization at the scale of the entire layer. Here, we demonstrate an application of the fuzzy kriging method in regionalization of hydrogeological data, in which the set of conventional, crisp values is supplemented by imprecise information subjectively estimated by an expert. It is believed that such an approach eventually may reflect the real-world conditions more closely than a traditional crisp-value approach, because the former does not impose exactness artificially on phenomena which are diffuse by their nature. Spatial interpolation was done for the thickness of one of the major aquitards (till and glaciolacustrine clay) in northwestern Germany. The dataset consists of 329 crisp values from boreholes supplemented by 172 imprecise values defined as fuzzy numbers. It is demonstrated that the reliability of regionalization was higher, compared to regionalization performed with the crisp dataset only. Fuzzy kriging was performed with FUZZEKS (Fuzzy Evaluation and Kriging System) developed at the Ecosystem Research Center at the University of Kiel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02083655
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  • 5
    Electronic Resource
    Electronic Resource
    Small-angle neutron scattering from a hexagonal phase under shear (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 85-88 
    Details
    ISSN: 1435-1536
    Keywords: Hexagonal phase ; small-angle neutron scattering ; shear orientation ; nonionic surfactant ; lyotropic liquid crystal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The shear orientation of a micellar hexagonal liquid crystalline phase was investigated by small-angle neutron scattering. The hexagonal phase in the quiescent state showed a symmetrical scattering pattern typical of a polydomain structure. Enhanced scattering along the flow direction was observed during shear and the anisotropy of scattering intensity became stronger with increasing shear rate. The anisotropic scattering pattern corresponds to an orientation perpendicular to the flow direction and can be interpreted as a log-rolling state. The oriented sample did not relax after cessation of shear. The results from small-angle neutron scattering confirm data obtained previously from rheo-small angle light scattering measurements and are discussed in comparison to shear alignment of lyotropic liquid crystalline polymer solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658914
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  • 6
    Electronic Resource
    Electronic Resource
    Verfahren zur Erstellung auswertbarer Bildvorlagen für mikrovisioplastische Untersuchungen (1996)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 27 (1996), S. 287-296 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The mechanical properties of polycristalline materials are depent on the type, the combination and the orientation of the elements in the micro structure. By means of the method of Visioplasticity assumptions are currently realized to analyse kinematic parameters inside of single grains and grain groups. Strength of the free surface of the specimen will be rough by its plastical deformation, it was difficult to register the increments of deformation of the grid. By further development of a method of picture analysis it is also possible to reproduce a 3d-surface by utilization of single light microscopical pictures.
    Notes: Die mechanischen Eigenschaften polykristalliner Werkstoffe sind von der Art der Mikrostrukturelemente, deren Zusammenwirken und Orientierung hauptsächlich abhängig. Mittels der Methode der Visioplastizität werden gegenwärtig Voraussetzungen geschaffen, die die Analyse kinematischer Feldkenngrößen innerhalb einzelner Strukturelemente (Kristallite) und Strukturverbände gestattet. Aufgrund der verformungsbedingten Aufrauhung der freien Probenoberfläche traten Probleme bei der Aufnahme der Rasterverformungen auf. Über die Weiterentwicklung eines Verfahrens der Bildverarbeitung wurde es möglich, 3D-Oberflächenstrukturen anhand der Auswertung lichtmikroskopischer Einzelbildaufnahmen abzubilden.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19960270607
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of Platinum-Group Elements (PGE) from catalytic converters in soil by means of docimasy and INAA (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 354 (1996), S. 883-885 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The nickelsulfide fire assay (docimasy) for the enrichment of platinum-group elements (PGEs) has been modified for the use with small samples and combined with instrumental neutron-activation analysis (INAA). This procedure has been applied to the determination of PGEs exhausted from catalytic converters and deposited in soil near the Wiesbadener Kreuz (highway A3, Frankfurt-Köln). Our results show a considerable enhancement of the Pt (up to 330 ng/g), Pd (6.6 ng/g) and Rh (7.5 ng/g) contents close to the highway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663540883
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