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  • Articles  (105,129)
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  • 1
    Electronic Resource
    Electronic Resource
    Elektrophoretische Untersuchungen der Superoxiddismutase-Isoenzyme beim hessischen Rotwild (Cervus elaphus L.) (1991)
    Springer
    European journal of wildlife research 37 (1991), S. 35-39 
    Details
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary The enzyme superoxide dismutase (SOD, E.C. 1.15.1.1.) was investigated electrophoretically in 196 muscle-, heart- and liver samples of red deer from the forest Reinhardswald, a game preserve in Hessen, Western Germany. The banding patterns in the electropherograms can be interpreted as products of two loci, one of them coding for an enzyme of dimeric quarternary structure. The observed genotypic distribution does not fit Hardy-Weinberg expectations. An excess of heterozygotes is observed. This phenomenon is explained by a sample bias caused by deer management. This study is the basis for further wide ranging investigations, intended to evaluate consequences of wildlife management on the genetic structure of this deer population.
    Abstract: Résumé L'enzyme Superoxiddismutase (SOD, E.C. 1.15.1.1.) a été étudié par électrophorèse continue et focalisation isoélectrique de 196 échantillons d'organes de cerfs provenant de la Réserve cynégétique de la Reinhardswald en Hesse. Les bandes électrophorétiques-types peuvent être interprétées comme étant le résultat de l'action de deux loci, le locus 1 codant un enzyme avec structure quaternaire dimérique. Un test de χ2 révèle que les fréquences observées du génotype s'écartent significativement des fréquences attendues, avec un excédent des hétérozygotes. Cette situation s'explique par le lâcher de cerfs hongrois dans la population autochtone avec, à chaque fois, des fréquences alléliques opposées et un tir sélectif. Ces recherches serviront à fonder des recherches ultérieures sur cette population en faisant appel à d'autres iso-enzymes afin de suivre les effets de la gestion cynégétique sur des paramètres génétiques.
    Notes: Zusammenfassung Das Enzym Superoxiddismutase (SOD, E.C. 1.15.1.1.) wurde mittels der kontinuierlichen Elektrophorese und der isoelektrischen Fokussierung anhand von 196 Rotwild-Organproben aus dem Wildschutzgebiet Reinhardswald/Hessen untersucht. Das Bandenmuster im Elektropherogramm kann als das Produkt zweier Loci interpretiert werden, wobei Genort-1 ein Enzym mit dimerer Quartärstruktur codiert. Im Chi2-Test zeigt sich eine signifikante Abweichung der beobachteten von den erwarteten Genotyphäufigkeiten, ein Überschuß an Heterozygoten wurde beobachtet. Dieser Zustand ist durch das Aussetzen von ungarischem Rotwild in die autochthone Population mit jeweils entgegengerichteten Allelfrequenzen und selektivem Abschuß erklärbar. Die Untersuchungen dienen als Grundstein für nachfolgende Untersuchungen an dieser Population unter Verwendung weiterer Isoenzyme, um Auswirkungen des jagdlichen Managements auf genetische Parameter zu verfolgen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02241645
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  • 2
    Electronic Resource
    Electronic Resource
    IV. Referate (1991)
    Springer
    European journal of wildlife research 37 (1991), S. 67-68 
    Details
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02241651
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen zur genetischen Situation des Damwildes in Nordrhein-Westfalen (1991)
    Springer
    European journal of wildlife research 37 (1991), S. 69-77 
    Details
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary In order to determine the genetic variability of fallow deer in hunting districts in Northrhine-Westphalia, 6 isoenzyme systems from liver tissue of 56 sample animals were analyzed using gel electrophoresis. Of the 11 gene loci studied, 8 were monomorphic. The average heterozygotic rate of all populations was 1.4 %, the average number of alleles per gene loci was 1.37. No significant differences were found among the populations. Measures concerning the management of fallow deer for hunting are discussed.
    Abstract: Résumé Afin d'établir la variabilité génétique du Daim(Dama dama) sur le plan biochimique dans des territoires de Rhénanie-Westphalie, on a anlysé sur un ensemble de 56 individus six systèmes d'isoenzymes du tissu hépatique par électrophorèse. Des 11 loci géniques recensés, 8 étaient monomorphes. Le taux moyen d'hétérozygotie de toutes les populations s'élevait à 1,4 %, le nombre moyen d'allèles par locus génique à 1,37. Aucune différence significative ne fut décelée entre les populations. Une discussion porte sur les mesures de gestion cynégétique du Daim.
    Notes: Zusammenfassung Um die biochemisch erfaßbare genetische Variabilität von Damwild (Dama dama) in Revieren in Nordrhein-Westfalen zu ermitteln, wurden bei insgesamt 56 Individuen sechs Isoenzymsysteme aus Lebergewebe gelelektrophoretisch analysiert. Von den erfaßten 11 Genorten waren 8 monomorph. Die durchschnittliche Heterozygotierate aller Populationen betrug 1,4 %, die durchschnittliche Anzahl Allele pro Genort 1,37. Es fanden sich keine signifikanten Unterschiede zwischen den Populationen. Maßnahmen zur jagdlichen Bewirtschaftung des Damwildes werden diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02241671
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  • 4
    Electronic Resource
    Electronic Resource
    Another new journal (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 1-2 
    Details
    ISSN: 1436-3259
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543905
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  • 5
    Electronic Resource
    Electronic Resource
    On the annual maximum distribution in dependent partial duration series (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 3-16 
    Details
    ISSN: 1436-3259
    Keywords: Annual maximum ; partial duration series ; T-year estimate ; marshall-Olkin bivariate distribution ; Morgenstern bivariate distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract As a basis for development of the annual maximum distribution the so-called partial duration series with Poissonian occurrence times and exponentially distributed peak exceedance values has been selected. The model is generalized by allowing for a Markov dependence between succeeding peak values. Correlation values from p=0 to p=1 can be accounted for by introducing the Marshall-Olkin bivariate exponential distribution, which is presented in detail. The developed distribution function for the annual maximum is throughly analysed and a variety of distribution forms depending on the value of the correlation coefficient and the intensity in the Poisson process is hereby recognized. To a certain extent this might be considered as parallel to the scattering of hydrological regions with different generating mechanisms for the annual maxima.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543906
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  • 6
    Electronic Resource
    Electronic Resource
    On a stochastic description of the time-space behaviour of extratropical cyclonic precipitation fields (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 37-52 
    Details
    ISSN: 1436-3259
    Keywords: Cyclonic precipitation ; mathematical modeling ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A stochastic description is developed for extratropical cyclonic precipitation fields at synoptic and meso scales as they are typically observed by radars over the Earth. This description attempts to account I) for the synoptic scale behavior of a cyclonic storm (its birth, its synoptic scale motion trajectory, and its dissipation) II) for the synoptic-scale organizational structure of subsynoptic precipitation areas (rainbands, precipitation cores and raincells) within a cyclonic storm; and III) for the behavior of subsynoptic precipitation areas, in terms of their births, their spatial configuration evolutions, their motions, and their deaths (dissipation). The precipitation cores and the raincells are taken as the building blocks of the subsynoptic precipitation, areas within a cyclonic rainfield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543908
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  • 7
    Electronic Resource
    Electronic Resource
    A review on stochastic differential equations for applications in hydrology (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 81-100 
    Details
    ISSN: 1436-3259
    Keywords: Stochastic differential equations ; Itô calculus ; Stratovovich integrals ; Jump integrals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Fundamentals of the theory of stochastic calculus and stochastic differential equations (SDE's) which are finding increasing application in water resources engineering are reviewed. The basics of probability theory, mean square calculus and the Wiener, white Gaussian and compound Poisson processes are given in preparation for a discussion of the general Itô SDE with drift, diffusion and jump discontinuity terms driven by Gaussian white noise and compound Poissionian impulses. Also discussed are stochastic integration and the derivation of moment equations via the Itô differential rule. The lierature of SDE's is reviewed with an emphasis on the more accessible sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543805
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  • 8
    Electronic Resource
    Electronic Resource
    The discrete Hurst range for skew independent two-valued inflows (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 53-66 
    Details
    ISSN: 1436-3259
    Keywords: Hurst range ; conditioned exchangeable, variables
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A new theoretical interpretation is proposed for Hurst's empirical law which is applicable to discrete-valued inflows and is consistent with the existing interpretation for continuous-valued inflows. This is applied to independent net inflows {X r} having values +1 and −1 with unequal probabilities. With the aid of a new result on the exchangeability of symmetrically conditioned exchangeable variables, values of the resulting range are obtained and tabulated. It is found that the effect of skewness is very slight for skewness values between (about) 3 and −3, and that Hurst's own approximation, the “conditioned range”, is remarkably accurate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543909
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  • 9
    Electronic Resource
    Electronic Resource
    Pattern analysis on mixed-mode hydrometric data (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 67-80 
    Details
    ISSN: 1436-3259
    Keywords: pattern analysis ; mixed-mode data ; event-covering ; discretization ; hydrometric data
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract This paper presents a pattern analysis technique that has been successfully applied to a set of hydrometric network data collected in British Columbia, Canada. This technique can extract information from a set of observed heterogeneous multivariate data. The data are represented as n-tuples of mixed discrete and continuous values. The technique is capable of screening out statistically irrelevant information. It is also able to detect inherent subgroups in the data through adopting an event-covering approach. The subgroup characteristics represent important empirical understanding even though there may be considerable probabilistic variation within each individual subgroup.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543910
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  • 10
    Electronic Resource
    Electronic Resource
    Stochastic models in hydrology (1987)
    Springer
    Stochastic environmental research and risk assessment 1 (1987), S. 17-36 
    Details
    ISSN: 1436-3259
    Keywords: Stochastic hydrology ; multivariate analysis ; information extraction ; information transfer ; structure of time series ; time series analysis ; spatial characteristics ; simulation of processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A stochastic approach to the analysis of hydrologic processes is defined along with a discussion of causes of tendency, periodicity and stochasticity in hydrologic series. Sources of temporal non-stationarity are described along with objectives and methods of analysis of processes and, in general, of information extraction from data. Transferred information as measured by correlation coefficients is compared with the transferable information as measured by entropy coefficients. Various multivariate approaches to hydrologic stochastic modeling are classified in light of complexities of spatial/temporal hydrologic processes. Alternatives of time series structural decomposition and modeling are compared. A special approach to modeling of space properties further contributes to approximate simulations of spatial/temporal processes over large areas. Several aspects of stochastic models in hydrology are concisely reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543907
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