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  • Artikel  (48)
  • Springer  (24)
  • Wiley  (24)
  • 1990-1994  (38)
  • 1965-1969  (10)
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  • Artikel  (48)
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  • 1
    Publikationsdatum: 1993-10-01
    Print ISSN: 0265-9247
    Digitale ISSN: 1521-1878
    Thema: Biologie , Medizin
    Publiziert von Wiley
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Bulletin of volcanology 56 (1994), S. 493-501 
    ISSN: 1432-0819
    Schlagwort(e): Key words Acoustic noise ; Steam ; Crater lake ; Volcano ; Ruapehu
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract Hydrophone measurements of acoustic noise levels in the Crater Lake of Mount Ruapehu, New Zealand were made on 18 January 1991 from an inflatable rubber boat on the lake. The greatest sound pressures were recorded in the 1–10 Hz band, with sound levels generally decreasing about 20 dB per decade from 10 Hz to 80 kHz. The low frequency noise did not have an obvious relationship to the tremor observed at a seismic station within 1 km of the lake. The comparatively low levels of middle and high frequency sound meant that at the time of measurement, direct steam input did not make a significant contribution to the heating of Crater Lake. This is consistent with the earlier conclusion that during the last decade a major part of the heat input of Crater Lake has come from lake water that was heated below the lake and recycled back into the lake.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular evolution 33 (1991), S. 412-417 
    ISSN: 1432-1432
    Schlagwort(e): Genetic code ; Complementary hydropathy ; Translation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary We have calculated the average effect of changing a codon by a single base for all possible single-base changes in the genetic code and for changes in the first, second, and third codon positions separately. Such values were calculated for an amino acid's polar requirement, hydropathy, molecular volume, and isoelectric point. For each attribute the average effect of single-base changes was also calculated for a large number of randomly generated codes that retained the same level of redundancy as the natural code. Amino acids whose codons differed by a single base in the first and third codon positions were very similar with respect to polar requirement and hydropathy. The major differences between amino acids were specified by the second codon position. Codons with U in the second position are hydrophobic, whereas most codons with A in the second position are hydrophilic. This accounts for the observation of complementary hydropathy. Single-base changes in the natural code had a smaller average effect on polar requirement than all but 0.02% of random codes. This result is most easily explained by selection to minimize deleterious effects of translation errors during the early evolution of the code.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Archives of environmental contamination and toxicology 27 (1994), S. 346-351 
    ISSN: 1432-0703
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Notizen: Abstract Lead sequestration in shell was examined for English and Welsh populations of the common garden snail (Helix aspersa) with different Pb exposure histories. Isotopic Pb ratios provided signatures for Pb source and a means of implying duration of population exposure from decades to millennia. Total Pb concentrations were used to quantify the intensity of exposure experienced by the populations. Snails from populations with long histories of exposure (millennia) to high Pb levels had proportionately more Pb in their shell than soft tissue compared with snails from other surveyed populations. These observations suggest that Pb sequestration in shell has been enhanced in H. aspersa populations with long and intense exposure to Pb.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Bulletin of volcanology 56 (1994), S. 493-501 
    ISSN: 1432-0819
    Schlagwort(e): Acoustic noise ; Steam ; Crater lake Volcano ; Ruapehu
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract Hydrophone measurements of acoustic noise levels in the Crater Lake of Mount Ruapehu, New Zealand were made on 18 January 1991 from an inflatable rubber boat on the lake. The greatest sound pressures were recorded in the 1–10 Hz band, with sound levels generally decreasing about 20 dB per decade from 10 Hz to 80 kHz. The low frequency noise did not have an obvious relationship to the tremor observed at a seismic station within 1 km of the lake. The comparatively low levels of middle and high frequency sound meant that at the time of measurement, direct steam input did not make a significant contribution to the heating of Crater Lake. This is consistent with the earlier conclusion that during the last decade a major part of the heat input of Crater Lake has come from lake water that was heated below the lake and recycled back into the lake.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Communications in mathematical physics 156 (1993), S. 473-525 
    ISSN: 1432-0916
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Notizen: Abstract Our aim in this paper is to make explicit the operator theory of the heuristic open Bosonic string and to abstract a suitable field algebra for the string. This is done on a Fock-Krein space and we examine integrability and J-unitary implementability of all the defining transformations of the string, i.e. time translations, gauge transformations and Poincaré transformations. The results obtained agree partially with those of Bowick and Rajeev, i.e. the gauge transformations do not leave the Fock-Krein complex structure invariant. Once we obtained integrated transformation groups on a suitable symplectic space for the infinitesimal transformations of the string, and proved implementability of these for the Fock-Krein representation, we are then free to define an abstract C*-algebra carrying all the algebraic information of the string, and to examine different representations.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    International journal of biometeorology 9 (1965), S. 21-28 
    ISSN: 1432-1254
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geographie , Physik
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Alle bekannten Einflüge von LAPHYGMA EXIGUA nach England von 1947–1963 wurden in Beziehung zu den vorhergehenden möglichen Fluglinien von der Süd-Biskaya aus untersucht; statistisch wird gezeigt, dass in jedem Fall die Motten aus Südspanien oder jenseits davon kamen. Motten, die zu Beginn des Jahres eintrafen, stammten aus Gebieten südlich 40°N, in den meisten Fällen aus Marokko oder Madeira. Von Mai ab war das Ursprungsland der meisten Motten Nordwestspanien, ausgenommen 1962,als sich die Herkunft einer verhältnismässig grossen Anzahl in Südengland bis Marokko zurückverfolgen liess.
    Kurzfassung: Resume Toutes les migrations connues de LAPHYGMA EXIGUA vers l'Angleterre entre 1947 et 1963 ont été étudiées en fonction des lignes de vol possibles à partir du Sud de la Biscaye; il est statistiquement établi que, dans tous les cas, ces mites venaient du Sud de l'Espagne ou d'au-delà. Les arrivées précoces dans l'année sont originaires de régions au Sud du 40 ème degré de Latitude Nord, la plupart du Maroc ou de Madère. A partir du mois de mai, la région d'origine de la plupart des mites a été le Nord-Ouest de l'Espagne, sauf en 1962 où les arrivées dans le Sud de l'Angleterre étaient originaires du Maroc.
    Notizen: Abstract All known immigrations of the LAPHYGMA EXIGUA into Britain in the period 1947 to 1963 were examined in relation to preceding potential trajectories from South Biscay and a statistical demonstration is given that in every case moths originated from North Spain or beyond. Arrivals early in the year are shown to have originated from south of 40°N, and in most cases from Morocco or Madeira.From May onwards,however, moths came mainly from North-west Spain, except in 1962 when relatively huge numbers in southern England could also be traced back to Morocco.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Machine vision and applications 3 (1990), S. 63-74 
    ISSN: 1432-1769
    Schlagwort(e): Radon transform ; back-projection ; image reconstruction ; multidimensional signal processing
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract The Radon transform and its inverse (a filtered backprojection) are receiving increasing attention for applications in image reconstruction. As data collection capabilities and image reconstruction algorithms have become more sophisticated, the computational intensity of these problems has drastically increased. Parallel processing techniques are being used to implement highspeed hardware designs that will speed up this computationally burdensome task. Parallel arrays of digital signal processing (DSP) chips may be used to compute the Radon transform and back-projection for high-speed image reconstruction. In this paper we describe computation of the Radon transform and back-projection using a parallel pipelined processor architecture of DSP chips and evaluate the accuracy of the computations and quality of reconstructed images. To justify the computational approach selected, alternative procedures for computation of the Radon transform and back-projection are described and their performance using the 32-bit fixed-point arithmetic of the selected DSP chips are compared. We present, evaluate, and compare the simulated performances of implementations of these procedures on two fixed-point DSP chips: the TI TMS32020 and the AT&T DSP16.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Planta 185 (1991), S. 27-33 
    ISSN: 1432-2048
    Schlagwort(e): Embryogenesis (Pelvetia) ; Ionic circulation ; Polarity induction ; Pelvetia ; Potassium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Previous reports have shown that fertilized Pelvetia fastigiata (J. Ag.) DeToni eggs generate a transcellular ionic current which correlates temporally and spatially with establishment of a rhizoid/thallus axis. In order to understand more fully the ionic controls of development, we have determined the ionic requirements for axis formation induced by unilateral light. Formation of the developmental axis was independent of the presence of individual ions in artificial seawater. This finding indicates that transcellular circulation of a particular ion is not obligatory for polarization, and it confirms earlier work showing that calcium circulation is not fundamental to axis establishment in Fucus zygotes. Polarization was not, however, completely independent of ionic conditions; zygotes were unable to form an axis in pure sucrose solutions. Single salts were added to sucrose to determine which ions were sufficient to permit polarization. Salts of impermeant monovalent cations and salts of divalent cations supported polarization weakly or not at all. By contrast, zygotes photopolarized well in KCl, and other alkali metals substituted for K+ with varying effectiveness (Rb+〉Na+〉 Cs+≫ Li+). The anion was unimportant; a variety of different potassium salts all supported polarization equally well. The mechanism by which KCl promotes polarization is not yet understood, but may involve transport through K+ channels.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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