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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of learning in related generalist and specialist eucoilid parasitoids (1992)
    Springer
    Entomologia experimentalis et applicata 64 (1992), S. 117-124 
    Details
    ISSN: 1570-7458
    Keywords: Learning ; specialist ; generalist ; parasitoid ; Leptopilina ; foraging behaviour ; Hymenoptera
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Effects of learning in two microhabitat specialists, Leptopilina boulardia Barbotin et al. and L. fimbriata Kieffer were compared to previous and new results of learning in the microhabitat generalist L. heterotoma Thomson. Females were given one or more oviposition experiences on hosts in different types of substrate. In all species oviposition experience affected the choice for a substrate, although this effect of learning was considerably less in L. fimbriata compared to the other two species. Patch times, known to be highly determined by experience in the generalist L. heterotoma, were much less flexible in the specialists. L. boulardi and L. fimbriata have fixed patch times on their natural substrate and have variable patch times on other substrates only. In all three species one oviposition affected the choice for a substrate. Additional ovipositions showed no different effect. An accumulative effect of the number of ovipositions on patch times was found in L. heterotoma only. Retention of the learning effect was only studied in L. boulardi, and was shown to be similar to that reported for L. heterotoma, i.e. two to three days. Although learning was found in both the generalist and the specialist species studied, it seems to affect their foraging behaviour differently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162984
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Fractal landscapes in biological systems: long-range correlations in DNA and interbeat heart intervals (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Here we discuss recent advances in applying ideas of fractals and disordered systems to two topics of biological interest, both topics having common the appearance of scale-free phenomena, i.e., correlations that have no characteristic length scale, typically exhibited by physical systems near a critical point and dynamical systems far from equilibrium. (i) DNA nucleotide sequences have traditionally been analyzed using models which incorporate the possibility of short-range nucleotide correlations. We found, instead, a remarkably long-range power law correlation. We found such long-range correlations in intron-containing genes and in non-transcribed regulatory DNA sequences as well as intragenomic DNA, but not in cDNA sequences or intron-less genes. We also found that the myosin heavy chain family gene evolution increases the fractal complexity of the DNA landscapes, consistent with the intron-late hypothesis of gene evolution. (ii) The healthy heartbeat is traditionally thought to be regulated according to the classical principle of homeostasis, whereby physiologic systems operate to reduce variability and achieve an equilibrium-like state. We found, however, that under normal conditions, beat-to-beat fluctuations in heart rate display long-range power law correlations.
    Keywords: Aerospace Medicine
    Type: Physica A (ISSN 0378-4371); Volume 191; 1-4; 1-12
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Fractal landscape analysis of DNA walks (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: By mapping nucleotide sequences onto a "DNA walk", we uncovered remarkably long-range power law correlations [Nature 356 (1992) 168] that imply a new scale invariant property of DNA. We found such long-range correlations in intron-containing genes and in non-transcribed regulatory DNA sequences, but not in cDNA sequences or intron-less genes. In this paper, we present more explicit evidences to support our findings.
    Keywords: Aerospace Medicine
    Type: Physica A (ISSN 0378-4371); Volume 191; 1-4; 25-9
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Annual Conference on Nuclear and Space Radiation Effects, 15th, University of New Mexico, Albuquerque, N. Mex., July 18-21, 1978, Proceedings (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Radiation effects in MOS devices and circuits are considered along with radiation effects in materials, space radiation effects and spacecraft charging, SGEMP, IEMP, EMP, fabrication of radiation-hardened devices, radiation effects in bipolar devices and circuits, simulation, energy deposition, and dosimetry. Attention is given to the rapid anneal of radiation-induced silicon-sapphire interface charge trapping, cosmic ray induced errors in MOS memory cells, a simple model for predicting radiation effects in MOS devices, the response of MNOS capacitors to ionizing radiation at 80 K, trapping effects in irradiated and avalanche-injected MOS capacitors, inelastic interactions of electrons with polystyrene, the photoelectron spectral yields generated by monochromatic soft X radiation, and electron transport in reactor materials.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Geological Interpretations of the Topography of Selected Regions of Venus from Arecibo to Goldstone Radar Interferometry (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Radar interferometry using Arecibo to transmit and three antennas at the Goldstone to receive was conducted on 14 dates in Spring, 2001. This data has been used so far to generate DEMs (digital elevation models) for several of the dates with pixel resolution of 0.5-1.0 km. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXIII; LPI-Contrib-1109
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    NASA TECHNICAL REPORTS
  • 6
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    Arecibo to Goldstone Radar Interferometric Topography of Selected Regions of Venus (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: New high resolution digital elevation models (DEMs) of the equatorial region of Venus will be merged with Magellan imagery in order to investigate the relationship between the emplacement of the plains and the tesserae, and rifting in Phoebe Region. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXII; LPI-Contrib-1080
    Format: text
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    NASA TECHNICAL REPORTS
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