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  • Artikel  (125)
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  • Artikel: DFG Deutsche Nationallizenzen  (125)
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  • 2015-2019
  • 1990-1994  (125)
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  • 1
    Digitale Medien
    Digitale Medien
    Mating behavior and male mating success in wildAnastrepha Ludens (Diptera: Tephritidae) on a field-caged host tree (1991)
    Springer
    Journal of insect behavior 4 (1991), S. 471-487 
    Details
    ISSN: 1572-8889
    Schlagwort(e): mating behavior ; courtship ; lek ; mating system ; Mexican fruit fly ; Anastrepha ludens
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Mating behavior and factors affecting mating success of males were studied using wild Anastrepha ludens on a fieldcaged host tree. The most common courtship sequence had five components: (1) male calls from the underside of a leaf, (2) female arrives to the maleoccupied leaf, (3) male orients to female and stops calling, (4) one or both approach to a face-to-face position 1–3 cm apart, and (5) male mounts female after 1–2 s. Courtship behavior was almost identical to that of laboratoryculture flies observed previously under laboratory conditions. Most malefemale encounters occurred at a height of 1–2m, well inside the outer canopy of the tree. Differential mating success by males occurred. No male mated more than once per day, owing possibly to a very short sexual activity period. Factors favoring mating success of males were survival ability and tendency to join male aggregations and to fight other males. Thorax length and age (9–11 days difference) had no effects on male copulatory success. Overall win/loss percentage was not related to mating success because the males that were most successful at mating fought mostly among themselves, driving their win/loss percentage down. However, these successful males (at mating) won most of their fights against less successful males. Results confirmed a lek mating system: males aggregated, called, and defended territories; territories did not contain femalerequired resources; and females exercised mate choice, apparently through selection of sites within leks.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01049332
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Multiple fatal mycetism caused byAmanita virosa in Mexico (1994)
    Springer
    Mycopathologia 125 (1994), S. 3-5 
    Details
    ISSN: 1573-0832
    Schlagwort(e): Amanita virosa ; Amatoxin ; Mortal mushroom poisoning
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Mushroom poisonings caused by amatoxins are mostly lethal. Information about mycetisms caused by white species ofAmanita is scarce. The present paper describes a case of mushroom poisoning caused byA. virosa. A prolongated latency period (6–10 hours), followed by cholera-like, improvement and visceral complication phases confirmed the amatoxin poisoning. The consumption of about 3 pounds of the toadstool by seven persons caused the death of five. Two patients survive the ingestion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01103968
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Divisibility properties and new bounds for cyclic codes and exponential sums in one and several variables (1994)
    Springer
    Applicable algebra in engineering, communication and computing 5 (1994), S. 105-116 
    Details
    ISSN: 1432-0622
    Schlagwort(e): Bounds on the distance of cyclic codes ; Divisible codes ; Exponential sums
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik , Mathematik , Technik allgemein
    Notizen: Abstract Serre has obtained sharp estimates for the number of rational points on an algebraic curve over a finite field. In this paper we supplement his technique with divisibility properties for exponential sums to derive new bounds for exponential sums in one and several variables. The new bounds give us an improvement on previous bounds for the minimum distance of the duals of BCH codes. The divisibility properties also imply the existence of gaps in the weight distribution of certain cyclic codes, and in particular gives us that BCH codes are divisible (in the sense of H. N. Ward).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01438279
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Harris lines and ethanol consumption during growth period (1993)
    Springer
    International journal of anthropology 8 (1993), S. 21-25 
    Details
    ISSN: 1824-3096
    Schlagwort(e): Ethanol consumption Harris lines
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Harris lines represent episodes of growth arrest followed by recovery, thus reflecting episodes of mismatched imbalance between energy intake and energy expenditure. Consumption of ethanol during the growth period — formerly extended in our wine-producing rural areas- may lead to such a situation, due at least in part to the energy-wasteful MEOS-linked ethanol metabolism. Based on these facts, in the present study we have analysed the relationship between ethanol intake during growth period and the presence of Harris lines in the right tibia in 100 consecutive adult patients admitted to our hospitalization unit. Early ethanol consumption was strongly related with the presence of two or more, and three or more Harris lines, so that ethanol consumption should be considered in the differential diagnosis of Harris lines, and conversely, the presence of Harris lines point to ethanol consumption during growth period. This association was independent from coexisting starvation and/or illness.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02447639
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    A qualitative mathematical model of the ontogeny of a circadian rhythm in crayfish (1993)
    Springer
    Bulletin of mathematical biology 55 (1993), S. 97-110 
    Details
    ISSN: 1522-9602
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract Based on experimental work on the ontogeny of the electroretinogram circadian rhythm in crayfish, we present a mathematical model simulating changes in both frequency and amplitude of the electroretinogram oscillation during several developmental stages until shortly before the adult age. Simultaneously, we propose a hypothetical oscillation in the hormonal release whose frequency is imposed on the electroretinogram oscillation. The model consists of two coupled nonlinear oscillators in which a dynamical response is obtained mainly through an Andronov-Hopf bifurcation. Through the construction of the model, a biological hypothesis about the essential elements underlying the ERG circadian rhythm and their interrelations is formulated and discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02460296
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    The kinetics of enzyme systems involving activation of zymogens (1993)
    Springer
    Bulletin of mathematical biology 55 (1993), S. 561-583 
    Details
    ISSN: 1522-9602
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract A general model of zymogen activation is proposed and explicit kinetic equations for the time courses of the various species and products involved are given. These equations are valid for the whole course of the reaction and therefore for both the transient phase and the steady state. This model is sufficiently general to include mechanisms possessing one or more steps of zymogen activation besides possible steps of inhibition (reversible or irreversible) or inactivation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02460651
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Scanning behaviour and spatial niche (1992)
    Springer
    Journal of ornithology 133 (1992), S. 73-77 
    Details
    ISSN: 1439-0361
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung An drei kleinen, Bäume nach Nahrung absuchenden Singvögeln (Kleiber, Tannenmeise, Haubenmeise) wurde das Suchverhalten in Beziehung zur räumlichen Nische untersucht. An künstlichen Futtergeräten wurde unter normierten Bedingungen die Aufmerksamkeit registriert, die die nahrungssuchenden Vögel der Umgebung schenkten. Bei Tannenmeisen, die in dichterer Vegetation nach Nahrung suchen als Kleiber, sind die Phasen der Nahrungssuche kürzer und häufiger. Dies deutet auf ein Syndrom des Verhaltens, das ein Zeitmuster der Kontrolle der Umgebung mit der räumlichen Nische einer Art in Beziehung bringt. Dieses Muster entsteht vermutlich aus dem Zusammenwirken von Häufigkeit und Dauer der Phasen der Nahrungssuche auf dem Substrat mit der Größe des Raumes, den ein Vogel nach Feinden zu kontrollieren hat, sowie der Deckung, die von der Umgebung angeboten wird.
    Notizen: Summary The scanning behaviour of three small tree-gleaning passerines (Nuthatch, Coal Tit and Cresated Tit) was investigated in relation to their spatial niche by observing vigilance while feeding on artificial feeders under controlled conditions. Coal Tits which forage in substrates with denser vegetation cover, showed shorter, more frequent scans than Nuthatches, which usually forage in open substrates. Our results suggest the existence of a foraging syndrome relating the vigilance pattern to the spatial niche of a species, which probably results from the interaction between scan frequency and scan duration in relation to the space a bird must survey for predators and the protection offered by the surroundings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01640041
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Contribution to radiative corrections from decoupling particles (1992)
    Springer
    The European physical journal 55 (1992), S. 175-177 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Particles which normally decouple in the large mass limit (i.e., unrelated to the symmetry breaking) may contribute to radiative corrections if their mass ism new∼M W . We study their effect on various observables.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01558303
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 9
    Digitale Medien
    Digitale Medien
    From records to self-description: The role played by RNA in early evolutive systems (1992)
    Springer
    Acta biotheoretica 40 (1992), S. 1-9 
    Details
    ISSN: 1572-8358
    Schlagwort(e): Ribozyme ; Record ; Code ; Self-description
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract We study the appearance of genetic information starting from a system where self-reproductive and enzymatic functions are supported by the same sort of molecules. In a first phase, the information must have arisen in the form of rate independent sequences as records of enzymatic functions. Although this stage must have played an important role in evolution, it will be shown how its evolutive capacities were blocked by the impossibility of appearance of geno/phenotype duality. Finally, a logical scheme is proposed for a transition process toward a system with a code offering a simplification of the conditions required from the assumption of a maximum use of the double RNA capacity, both reproductive and enzymatic.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00046546
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Synthesis, characterization, and crystal structure of 1,3,7,9-tetramethylpyrido-[2,3-d∶6,5-d′]-dipyrimidine-2,4,6,8-tetrone (1994)
    Springer
    Journal of chemical crystallography 24 (1994), S. 465-468 
    Details
    ISSN: 1572-8854
    Schlagwort(e): Pyrimidine ; uracil ; crystal structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract A new and easy method for the preparation of 1,3,7,9-tetramethylpyrido-[2,3-d∶6,5-d′]-dipyrimidine-2,4,6,8-tetrone is described. The structure of this compound has been solved by means of X-ray diffraction methods. The chemical characterization by spectral (mass, ultraviolet, infrared, and proton nuclear magnetic resonance) and thermal (thermogravimetry and differential scanning calorimetry) method is also reported. The compound is monoclinic, space groupP21/c,a=12.720(5),b=13.688(7),c=8.079(2) Å, β=107.06(4)°,Z=4. The structure consists of discrete tricyclic molecules, stacking playing an important role in crystal packing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01666096
    Standort Signatur Erwartet Verfügbarkeit
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