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  • Springer  (117)
  • Cambridge University Press  (15)
  • Oxford University Press  (12)
  • 2005-2009
  • 1990-1994
  • 1980-1984  (144)
  • 1983  (84)
  • 1980  (60)
  • 1
    Digitale Medien
    Digitale Medien
    Cambridge : Cambridge University Press
    Journal of American studies 17 (1983), S. 278-278 
    ISSN: 0021-8758
    Quelle: Cambridge Journals Digital Archives
    Thema: Anglistik, Amerikanistik , Geschichte , Politikwissenschaft , Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Mathematical programming 18 (1980), S. 138-145 
    ISSN: 1436-4646
    Schlagwort(e): Set-covering Problem ; Branch and Bound ; Lower Bounds ; Steiner Triple Systems
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik , Mathematik
    Notizen: Abstract Fulkerson et al. have given two examples of set covering problems that are empirically difficult to solve. They arise from Steiner triple systems and the larger problem, which has a constraint matrix of size 330 × 45 has only recently been solved. In this note, we show that the Steiner triple systems do indeed give rise to a series of problems that are probably hard to solve by implicit enumeration. The main result is that for ann variable problem, branch and bound algorithms using a linear programming relaxation, and/or elimination by dominance require the examination of a super-polynomial number of partial solutions
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 5 (1980), S. 299-308 
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We analyse the CP N−1 models in two and three dimensions. We discuss the effective potential, Greens functions and β functions to leading order. To non-leading order we formally evaluate and renormalise the effective potential. In three dimensions we also calculate the β function to $$0\left( {\frac{1}{N}} \right)$$ . We show that it has a non-trivial fixed point which corresponds to a phase transition. This phenomenon persists beyond the leading order. The vacuum states are also unchanged by the nonleading order corrections.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    ISSN: 1435-1536
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    ISSN: 1570-7458
    Schlagwort(e): Tephritidae ; Anastrepha suspensa ; Fruit Flies ; Citrus ; Senescence ; Host Plant Resistance ; Allelochemics ; Terpenes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Résumé Nous avons trouvé que la résistance des fruits de Citrus aux attaques d'Anastrepha suspensa Loew est due aux huiles essentielles allélopathiques de la zone flavedo du zeste. Le taux d'éclosion des œufs pondus entre les glandes essentielles du zeste était significativement plus élevé que celui des œufs pondus dans les zones glandulaires. La mortalité se produisait essentiellement au premier stade larvaire, et beaucoup de larves mouraient avant d'atteindre l'albédo (la zone sans huile essentielle du zeste). Les pamplemousses sont plus sensibles au développement larvaire que les oranges, et les citrons ne portent virtuellement pas d'attaques réussies de cette mouche. Les fruits qui étaient laissés sur l'arbre après la maturation étaient un peu plus sensibles que les fruits de début de saison. La résistance du fruit était liée à 1) l'épaisseur dur flavedo 2) une forte concentration de linalool en relation avec le limonène dans les essences du zeste et 3) la valeur absolue d'essences par unité de surface de zeste. Les composés volatiles de l'essence de zeste plutôt que les fractions à point d'ébullition élevé paraissent être responsables de la toxicité des essences. Les citrons, qui sont indemnes d'attaques de cette espèce et d'autres de Tephritidae, avaient un flavedo sifnificativement plus épais et avait deux foi plus d'essences par unité de surface de zeste que les oranges et les pamplemousses; l'essence de citron est connue aussi pour être riche en terpénoïdes oxygénés, comme le linalool. La discussion porte sur les applications possibles de ces phénomènes dans l'amélioration de la résistance des agrumes aux Téphritidae.
    Notizen: Summary Resistance of citrus fruit to attack by the Caribbean fruit fly, Anastrepha suspensa (Loew), was attributed to allelopathic essential oils in the flavedo region of the peel. Hatchability of eggs laid between peel oil glands was significantly greater than that of eggs laid into glands. Mortality occurred principally in the 1st larval instar, and most larvae died before reaching the albedo (the non-oily region of the peel). Grapefruit were more susceptible to larval development than oranges, and lemons were virtually immune to successful attack by this fly. Fruit that were allowed to remain on the tree until overripe were somewhat more susceptible than early-season fruit. Fruit resistance was correlated with (1) flavedo thickness, (2) a high concentration of linalool in relation to limonene in the peel oil, and (3) the absolute amount of oil per unit area of peel. Volatile components of the peel oil rather than high boiling fractions appear to account for oil toxicity. Possible applications of these findings are discussed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Microplankton cages with porous polycarbonate membrane sides were used to investigate the population growth of Favella sp., a large tintinnid which preys on dinoflagellates, Balanion sp., a non-loricate ciliate which also preys on dinoflagellates, and two other tintinnids, Eutintinnus pectinis and Tintinnopsis kofoidi, at close to in-situ conditions in a small estuary during a spring dinoflagellate bloom. The effects of temperature and food concentration on the growth of Favella sp. and Balanion sp. were also investigated in culture. Growth rates in the field were variable from day to day. The highest net growth constant (base e) observed for Favella sp. in the cages was 0.032 (generation time 21.7 h). This was lower than growth constants which can be achieved in culture. Food availability, parasitism by the dinoflagellate Duboscquella sp., and perhaps life cycle events all contributed to the lower net growth rate of Favella sp. in the field. The highest net growth constant observed in the cages for Balanion sp. was 0.068 (generation time=10.7 h), which is also lower than growth constants achieved in culture. The growth of Balanion sp. populations in the cages was limited by the availability of small-sized dinoflagellates and by predation. The highest net growth constants observed for E. pectinis and T. kofoidi were 0.030 and 0.068, respectively; we know little about the factors controlling the growth of these tintinnids.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Six diel TCO2 cycles determined by infrared (IR) photometry from five drift stations occupied between 24 February and 16 March 1979 in the mixed layer of the northwestern Caribbean Sea are examined. Comparison of TCO2 variation with coincident salinity and O2 variation demonstrated that TCO2 often co-varied with these independently measured variables. During five diel cycles TCO2 variation was characterized by nocturnal production and diurnal consumption. The inverse, diurnal production of CO2, occurred downstream from Misteriosa Bank, whose corals apparently contributed to a water mass having a twofold increase of POC and a sixfold larger population of heterotrophic nanoplankters. For the five diel studies carried out in waters with balanced or nearly blanced heterotrophic and phototrophic components of the nanoplankton, CO2 consumption at constant salinity always occurred between 06.00 and 09.00 hrs. Net uptake often continued through 15.00 hrs, but not always in the absence of significant salinity changes. At constant salinity net O2 evolution never exceeded 0.5 μmol l-1 h-1 while net CO2 uptake consistently averaged 3 μmol l-1 h-1 for an apparent net production of 36 mg C m-3 h-1, which greatly exceeds the O2 changes and open ocean 14C estimates from the literature. Diurnal consumption was apparently balanced by nocturnal production of CO2 so that no significant net daily change in TCO2 was observed. Departures from theoretical PQ and RQ and the possibility of nocturnal variations in formaldehyde and carbonate alkalinity imply that chemotrophs, both methane producers and methane oxidizers, play a significant role in CO2 cycling. This could be through the metabolism of the nonconservative gases CH4, CO, and H2, and a link between chemotrophy and phototrophy through these gases is hypothesized. These open system measurements were subject to diffusion and documentable patchiness, but temporal TCO2 changes appear to indicate the net direction of microbiological activity and join a growing body of literature showing dynamic variation in CO2 and O2 that exceeds estimates by 14C bottle assays of carbon fixation.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Bulletin of environmental contamination and toxicology 25 (1980), S. 639-645 
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Bulletin of environmental contamination and toxicology 25 (1980), S. 321-324 
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Bulletin of environmental contamination and toxicology 31 (1983), S. 631-638 
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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