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  • Springer  (820)
  • Cambridge University Press  (65)
  • 1
    Digitale Medien
    Digitale Medien
    Fate and behavior of organic compounds in an artificial saturated subsoil under controlled redox conditions: The sequential soil column system (1999)
    Springer
    Biodegradation 10 (1999), S. 75-82 
    Details
    ISSN: 1572-9729
    Schlagwort(e): biotransformation ; redox conditions ; soil columns ; xenobiotics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract A system was developed to investigate the fate and behavior of anthropogenic organic contaminants at concentrations present in polluted subsoils and aquifers. A sequential soil column system was constructed to simulate redox conditions from methanogenic, sulfate-reducing, denitrifying, to aerobic conditions which normally occur in a leachate pollution plume. This system allowed the simulation of subsurface pollution with a range of xenobiotics and the observation of the microbial response to this contamination. After an adaptation period of up to about 7 months, 2,4-dichlorophenol and 2-nitrophenol were eliminated and perchloroethene disappeared almost completely in the methanogenic column. Toluene was partially transformed under sulfate-reducing conditions, and nearly completely in the nitrate-reducing column. The same applied to naphthalene under denitrifying and aerobic conditions. Aerobically, a fraction of benzene was transformed, and 1,4-dichlorobenzene decreased to very low residual concentrations in one system. No significant transformation of 1,1-dichloroethene could be seen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008321917025
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Switchgrass Seedling Development as Affected by Seed Size (1999)
    Springer
    Semigroup forum 91 (1999), S. 335-338 
    Details
    ISSN: 1432-2137
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: -1 ) and light seed (LS) (0.13 to 0.16 g 100 seed-1) of 'Blackwell' and 'Trailblazer' switchgrass (Panicum virgatum L.). The experiment was conducted in 1995 and 1996 at Lincoln, NE, on a Kennebee silt loam (fine-silty, mixed, superactive, mesic Cumulic Hapludolls). The experimental design was a randomized complete block with four replicates. Seed was separated into two sizes using a South Dakota seed blower. Seed was planted into rows at a rate of 100 pure live seed per meter of row. Plants were excavated and evaluated for shoot weight, leaf area, and root weight. Shoot and root systems were morphologically staged four times during the summer. Seed size differences in switchgrass appeared to produce only slight differences in morphological development of shoot and root systems, leaf area, shoot weight, and adventitious root weight from seedling emergence to 6 wk of growth. Adventitious roots formed more quickly on seedlings from heavier than lighter seed, but the advantage to seedling establishment was minimal even when soil moisture appeared to be lacking. By 8 to 10 wk after emergence, growth and development of LS seedlings were similar to HS seedlings. Once seedlings formed two or more adventitious roots, seed size no longer affected establishment and growth. Seed size in switchgrass appears to have a minimal long-term effect on growth and development of seedlings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Spontaneous oscillations in two 2-component cells coupled by diffusion (1986)
    Springer
    Journal of mathematical biology 23 (1986), S. 205-219 
    Details
    ISSN: 1432-1416
    Schlagwort(e): Coupled oscillators ; Diffuse instabilities ; Brusselator ; Glycolytic oscillations ; Hopf bifurcation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract Mathematical examples are presented of oscillators with two variables which do not oscillate in isolation, but which do oscillate stably when coupled with a twin via difiusion. Two examples are presented, the LefeverPrigogine Brusselator and a system used to model glycolytic oscillations. The mathematical method is not the usual bifurcation theory, but rather a type of singular perturbation theory combined with bifurcation theory. For both examples, it is shown that all stationary solutions are unstable for appropriate parameter settings. In the case of the Brusselator, it is further shown that there exist limit cycles; i.e. stable oscillations, in this parameter range. A numerical example is presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00276957
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    On the dynamics of bursting systems (1991)
    Springer
    Journal of mathematical biology 29 (1991), S. 405-423 
    Details
    ISSN: 1432-1416
    Schlagwort(e): Bursting ; Fast-slow decomposition ; Bifurcation ; Pancreatic β-cell model
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract The dynamics of three-variable models of bursting are studied. It is shown that under certain conditions, the dynamics on the attractor can be essentially reduced to two dimensions. The salient dynamics on the attractor can thus be completely described by the return map of a section which is a logistic interval map. Two specific bursting models from the literature are shown to fit in the general framework which is developed. Bifurcation of the full system for one case in investigated and the dynamical behavior on the attractor is shown to depend on the position of a certain nullcline.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00160469
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Tobacco mosaic virus inoculation inhibits wound-induced jasmonic acid-mediated responses within but not between plants (1999)
    Springer
    Planta 209 (1999), S. 87-95 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Key words: Herbivory ; Jasmonic acid ; Nicotiana (defense responses) ; Methyl salicylic acid ; Nicotine ; Tobacco mosaic virus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract. Jasmonic acid (JA) and salicylic acid (SA) have both been implicated as important signal molecules mediating induced defenses of Nicotiana tabacum L. against herbivores and pathogens. Since the application of SA to a wound site can inhibit both wound-induced JA and a defense response that it elicits, namely nicotine production, we determined if tobacco mosaic virus (TMV) inoculation, with its associated endogenous systemic increase in SA, reduces a plant's ability to increase JA and nicotine levels in response to mechanical damage, and evaluated the consequences of these interactions for the amount of tissue removed by a nicotine-tolerant herbivore, Manduca sexta. Additionally, we determined whether the release of volatile methyl salicylic acid (MeSA) from inoculated plants can reduce wound-induced JA and nicotine responses in uninoculated plants sharing the same chamber. The TMV-inoculated plants, though capable of inducing nicotine normally in response to methyl jasmonate applications, had attenuated wound-induced JA and nicotine responses. Moreover, larvae consumed 1.7- to 2.7-times more leaf tissue from TMV-inoculated plants than from mock-inoculated plants. Uninoculated plants growing in chambers downwind of either TMV-inoculated plants or vials releasing MeSA at 83- to 643-times the amount TMV-inoculated plants release, exhibited normal wound-induced responses. We conclude that tobacco plants, when inoculated with TMV, are unable to elicit normal wound responses, due likely to the inhibition of JA production by the systemic increase in SA induced by virus-inoculation. The release of volatile MeSA from inoculated plants is not sufficient to influence the wound-induced responses of neighboring plants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004250050609
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Predator avoidance by the freshwater snailPhysella virgata in response to the crayfishProcambarus simulans (1991)
    Springer
    Oecologia 87 (1991), S. 435-442 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Predator avoidance ; Snails ; Crayfish ; Predation ; Predator-prey interactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary We examined predator avoidance behavior of the freshwater snailPhysella (=Physa) virgata in response to the crayfishProcambarus simulans. In both laboratory and field enclosure experiments snails crawled above the waterline for 2 h or longer, then returned to the water.Physella virgata react to chemical signals given off by crayfish actively foraging on conspecific snails; they do not react to inactive crayfish. Low dissolved oxygen, crowding, and disturbance of the sediments did not elicit “crawlout” behavior. Crawling above the waterline, by reducing the probability of encounter between vulnerable, thin-shelled snails and crayfish, is an adaptive response to predation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00634603
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Book reviews (1996)
    Springer
    Mineralium deposita 31 (1996), S. 250-252 
    Details
    ISSN: 1432-1866
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00204035
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Global bifurcation of waves (1979)
    Springer
    Manuscripta mathematica 27 (1979), S. 159-166 
    Details
    ISSN: 1432-1785
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract In this note it will be shown how a theorem of Alexander [1] and Ize [9] together with computational results of Alexander and Yorke [4] and Alexander and Fitzpatrick [2] may be used to generalize the existence theorem for, and to prove some global results about, certain wave-like solutions of nonlinear systems of partial differential equations. The equations to be studied are weakly coupled parabolic systems of equations defined on a bounded axisymmetric domain. Such equations are often called reaction-diffusion equations (or interaction-diffusion equations) and arise in many parts of biology and chemistry. The question as to how wave-like solutions of these equations may bifurcate from a family of trivial solutions was studied by Auchmuty [5] and the results will be considerably extended here.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01299293
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Generic convergence of infinite products of positive linear operators (1999)
    Springer
    Integral equations and operator theory 35 (1999), S. 232-252 
    Details
    ISSN: 1420-8989
    Schlagwort(e): 46B40 ; 47B60 ; 58F99
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract We present several results concerning the asymptotic behavior of (random) infinite products of generic sequences of positive linear operators on an ordered Banach space. In addition to a weak ergodic theorem we also obtain convergence to an operator of the formf(·)η wheref is a continuous linear functional and η is a common fixed point.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01196385
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Wildlife in some areas of New Mexico and Texas accumulate elevated DDE residues, 1983 (1986)
    Springer
    Archives of environmental contamination and toxicology 15 (1986), S. 149-157 
    Details
    ISSN: 1432-0703
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Notizen: Abstract Over the last decade, data gathered by the U.S. Fish & Wildlife Service's National Contaminant Biomonitoring Program have identified an area of elevated DDE contamination in portions of New Mexico and Texas. Extensive wildlife sampling in 1983 confirmed that DDE, the major metabolite of the insecticide DDT, was present at high concentrations in wildlife at selected sites in the Rio Grande and Pecos River drainages. DDE in carcasses ranged up to 47 ppm (wet weight) in western kingbirds (Tyrannus verticalis), 35 ppm in house sparrows (Passer domesticus), 46 ppm in Brazilian free-tailed bats (Tadarida brasiliensis), and 104 ppm in whiptail lizards (Cnemidophorus spp.). DDE was also detected in gut contents from western kingbirds at some of the highest concentrations ever reported, ranging up to 21 ppm in proventricular samples. An average of 40% of the eggs of black-crowned night-herons (Nycticorax nycticorax) from two sites along the Pecos River in New Mexico had DDE levels (≥8 ppm) that have been associated in other studies with impaired reproduction. In contrast, wintering mallards (Anas platyrhynchos) and American coots (Fulica americana) from the study area did not accumulate elevated DDE levels. DDE in wildlife samples at control sites (nonagricultural areas) was either absent or averaged less than 0.35 ppm. Collectively, these data provide evidence that there is major DDE contamination of several vertebrate species in portions of the Rio Grande and Pecos River drainages, but whether the contamination is recent or residual was not determined. Apparently, the source was not DDE contamination present in dicofol (4-chloro-a-(4-chlorophenyl)-a-(trichloromethyl) benzenemethanol); neither dicofol nor its metabolite,p,p'-dichlorobenzophenone, were detected in wildlife carcasses (0.1 ppm detection limit) or proventricular contents (0.01 ppm detection limit) of western kingbirds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01059964
    Standort Signatur Erwartet Verfügbarkeit
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