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  • Chemistry  (43)
  • Hymenoptera  (7)
  • oviposition  (6)
  • seeds  (5)
  • 15A48  (3)
  • 90C20  (3)
  • 1
    Electronic Resource
    Electronic Resource
    28-Homoteasterone, a naturally occurring brassinosteroid from seeds of Raphanus sativus
    Amsterdam : Elsevier
    Phytochemistry 34 (1993), S. 391-392 
    Details
    ISSN: 0031-9422
    Keywords: 28-homoteasterone ; Cruciferae ; Raphanus sativus ; brassinosteroids ; seeds ; teasterone.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(93)80014-J
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Brassinosteroids and sterols from seeds of Beta vulgaris
    Amsterdam : Elsevier
    Phytochemistry 36 (1994), S. 175-177 
    Details
    ISSN: 0031-9422
    Keywords: 24-epicastasterone ; Beta vulgaris ; Chenopodiaceae ; brassinosteroids ; castasterone ; phytosterols. ; seeds ; triterpenoids
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)97034-1
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The co-occurrence of 24-epi-castasterone and castasterone in seeds of Ornithopus sativus
    Amsterdam : Elsevier
    Phytochemistry 32 (1993), S. 1614-1615 
    Details
    ISSN: 0031-9422
    Keywords: 24-epi-castasterone ; GC-mass spectrometry. ; Leguminoseae ; Ornithopus sativus ; brassinosteroids ; castasterone ; seeds
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(93)85191-S
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Castasterone and brassinolide in Raphanus sativus seeds
    Amsterdam : Elsevier
    Phytochemistry 30 (1991), S. 364-365 
    Details
    ISSN: 0031-9422
    Keywords: Brassicaceae ; Raphanus sativus ; brassinolide. ; brassinosteroids ; castasterone ; seeds
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(91)84159-P
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Sterol constituents in seeds of Ornithopus sativus
    Amsterdam : Elsevier
    Phytochemistry 33 (1993), S. 506-507 
    Details
    ISSN: 0031-9422
    Keywords: 7-hydroxysterols. ; 7-oxosterols ; Leguminoseae ; Ornithopus sativus ; seeds ; sterols ; β-amyrin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(93)85550-B
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  • 6
    Electronic Resource
    Electronic Resource
    Convexity preserving interpolation with exponential splines (1986)
    Springer
    Computing 36 (1986), S. 335-342 
    Details
    ISSN: 1436-5057
    Keywords: 65D07 ; 41A15 ; 90C20 ; Convexity conditions ; weakly coupled system of inequalities ; numerical algorithms ; quadratic programming ; unconstrained dual program with tridiagonal Hessian
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Während die Aufgabe der konvexen Interpolation im Falle kubischer Splines im allgemeineen nicht lösbar ist, kann jetzt gezeigt werden, daß sie bei Verwendung von Exponentialsplines Lösungen besitzt sofern die vorkommenden Parameter hinreichend roß sind, und es werden konkrete hinreichende und notwendige Lösbarkeitsbedingungen hergeleitet. Da eindeutige Lösbarkeit in der Regel nicht vorliegt, wird eine Auswahlfunktion eingeführt und das entstehende quadratische Optimierungsproblem nach Dualisierung numerisch behandelt.
    Notes: Abstract Sufficient and necessary conditions are derived under which interpolating splines are convex if the data set is in convex position. In order to select one of the interpolants, by means of a well-known objective function a quadratic optimization problem is stated which can be solved effectively by passing to a dual program.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02240208
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  • 7
    Electronic Resource
    Electronic Resource
    Convex spline interpolants with minimal curvature (1985)
    Springer
    Computing 35 (1985), S. 219-229 
    Details
    ISSN: 1436-5057
    Keywords: 65K05 ; 65D07 ; 90C20 ; 41A15 ; Existence conditions ; quadratic programming ; dual optimization problem ; tridiagonal Hessian ; Newton's method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Das Problem, konvexe Interpolationssplines mit minimaler mittlerer Krümmung zu ermitteln, führt auf eine speziell strukturierte quadratische Optimierungsaufgabe. In der vorliegenden Note wird eine zugehörige duale Aufgabe aufgestellt, die ohne Nebenbedingungen auskommt, deren Zielfunktion stückweise quadratisch ist und die daher eine effektive numerische Behandlung erlaubt.
    Notes: Abstract The problem of finding convex spline interpolants with minimal mean curvature leads to a quadratic optimization problem of special structure. In the present note a corresponding dual problem without constraints is derived. Its objective function is piecewise quadratic and therefore admits an effective numerical treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02260507
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    The suitability of some natural and artificial substrates as oviposition sites for the insidious flower bug, Orius insidiosus (1996)
    Springer
    Entomologia experimentalis et applicata 80 (1996), S. 325-333 
    Details
    ISSN: 1570-7458
    Keywords: oviposition ; biological control ; predators ; mass rearing ; choice tests ; anthocorids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A variety of natural and artificial substrates were tested for their suitability as oviposition sites for the predatory anthocorid bug Orius insidiosus. The bugs oviposited into models of beans constructed from Parafilm, but none of the eggs laid into these models hatched. In choice tests, beans stems were preferred to both bean pods and potato sprouts. Hatching rates at 100% r.h. were highest (59%) for bean pods and significantly lower for both potato sprouts (39%) and bean stems (29%). At 60% r.h., hatching rates for bean pods (39%), bean stems (34%) and potato sprouts (33%) were similar. At 30% r.h. hatching rates for all three substrates were less than 15%. The results suggest that bean stems can be used successfully as an alternative to bean pods for the mass rearing of these biological control agents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188025
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  • 9
    Electronic Resource
    Electronic Resource
    Host examination walk and oviposition site selection ofTrichogramma minutum: Studies on spherical hosts (1989)
    Springer
    Journal of insect behavior 2 (1989), S. 143-171 
    Details
    ISSN: 1572-8889
    Keywords: host examination ; host recognition ; locomotion ; parasitoid ; Trichogramma minutum ; oviposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The host examination behavior of the parasitoid wasp Trichogramma minutumon spherical Manduca sextahosts is described. The mean walking speed during host examination was 0.64 ± 0.03 mm s −1 and is independent of wasp size. The paths taken by the wasps are not evenly distributed over the host surface; the majority of time is spent below 45 ° latitude. The distribution of oviposition sites is also nonrandom with respect to latitude and is not influenced by phototaxic and geotaxic responses. The initial transit made by the wasps over the host surface is a straight path which frequently passes across the highest point on the host. The length and duration of the initial transit are independent of wasp body length. However, stride length and stepping rates are proportional to wasp body length, and small wasps take more steps to complete their initial transit. The roles of the examination walk in host recognition and host volume measurement by Trichogrammaare also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053289
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  • 10
    Electronic Resource
    Electronic Resource
    On theR-order of coupled sequences arising in single-step type methods (1988)
    Springer
    Numerische Mathematik 53 (1988), S. 653-661 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65H10 ; 15A48 ; CR: G1.5
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary As shown in preceding papers of the authors, the verification of anR-convergence order τ for sequences coupled by a system (1.1) of basic inequalities can be reduced to the positive solvability of system (3.3) of linear inequalities. Further, the bestR-order $$\bar \tau$$ implied by (1.1) is equal to the minimal spectral radius of certain matrices composed from the exponents occuring in (1.1). Now, these results are proven in a unified and essentially simpler way. Moreover, they are somewhat extended in order to facilitate applications to concrete methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01397134
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