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  • 1
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    Food limitation and low-density populations of sympatric hamster species in North China (2009)
    In:  Contributions to Zoology vol. 78 no. 2, pp. 65-75
    Details
    Publication Date: 2024-01-12
    Description: Although food has been proposed as a possible factor on population regulation of small mammals, evidence of food restriction in field conditions is still lacking. Food restriction is generally thought to occur in high-density years of oscillating populations of small mammals. By using two body condition indices (muscle protein concentration and cleaned carcass index), we investigated variations of body condition of the greater long-tailed hamster (Tscherskia triton) and the striped hamster (Cricetulus barabensis) in the Raoyang County of the North China Plain during a population decline- and low-phase from 1998 to 2003. Our laboratory experiments showed that food restriction reduced muscle protein concentration and cleaned carcass index of greater long-tailed hamster. We found there were significant differences in body condition of hamsters over the six years. Both the muscle protein concentration and cleaned carcass index of T. triton were significantly and positively correlated with its yearly trap successes, which reflected yearly population densities. Muscle protein concentration of C. barabensis was positively correlated with the total yield of the wheat. This observation supported the hypothesis on the in-phase relation between food resources or availability and rodent abundances. During the four seasons, muscle protein concentration of two species was highest in autumn, and lowest in summer. These two body condition indices of wild T. triton in summer and in low phases were similar to 60% food restricted animals raised in the laboratory, but significantly lower than nonfood-restricted animals. Our results indicated that malnutrition occurred in summer when food was not abundant, and in low density years with low grain production (an index reflecting food abundance of rodents) in our study region. Therefore, we concluded that food limitation may play an important role in seasonal and inter-annual population fluctuation of these two hamster species.
    Keywords: body condition ; Cricetulus barabensis ; density-dependent food restriction ; population dynamics ; Tscherskia triton
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Femtosecond reflectivity of 60 K Y-Ba-Cu-O thin films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1150-1152 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report systematic studies of the femtosecond transient reflectivity at 2 eV in partially oxygen-depleted Y-Ba-Cu-O thin films exhibiting the resistive superconducting transition at 60 K. Our measurements, performed at room temperature, reveal that in 60 K films, the Fermi level in the Cu-O2 plane lies approximately 2 eV above the filled copper d9/d10 band. By mapping the transient optical response across a 1 cm2 film, we show that the position of the Fermi level is very sensitive to the apparent local variations of the film oxygen content, which gives rise to dramatically different transient optical responses. We also observe a strong transient reflectivity dependence on intensity, which can be attributed to the shift of the Fermi level caused by nonequilibrium hole heating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110835
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  • 3
    Electronic Resource
    Electronic Resource
    Laser patterning of Y-Ba-Cu-O thin-film devices and circuits (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 643-645 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report our studies on electrical properties of Y-Ba-Cu-O test devices and circuits fabricated using a laser-writing patterning technique. The patterning procedure is noninvasive, does not require a patterning mask, and does not contaminate nor damage the surface of patterned films. Our laser-written, oxygen-rich lines (typically 4–100 μm wide) possess excellent superconducting properties with zero resistivity at 89.5 K and critical current densities of above 2 MA/cm2 at 77 K. On the other hand, oxygen-poor regions are semiconducting and exhibit thermally activated transport, well described by a three-dimensional, variable-length hopping process. Their resistance below 100 K is above 10 MΩ/square. A number of test structures patterned by laser writing, such as a microbridge, coplanar transmission line, open-ended microwave resonator, photoconductive switch, and Y-Ba-Cu-O field-effect transistor, have been presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111075
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  • 4
    Electronic Resource
    Electronic Resource
    Tissue distribution and kininogen gene expression after acute-phase inflammation
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/General Subjects 964 (1988), S. 329-339 
    Details
    ISSN: 0304-4165
    Keywords: Inflammation ; Kininogen induction ; Kininogen mRNA ; Monoclonal antibody ; Tissue distribution
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-4165(88)90033-5
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  • 5
    Electronic Resource
    Electronic Resource
    The primary structure of human apolipoprotein A-IV
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 1002 (1989), S. 231-237 
    Details
    ISSN: 0005-2760
    Keywords: Amino acid sequence ; Apolipoprotein A-IV ; DNA sequence ; HDL ; Lecithin-cholesterol acyltransferase ; Sequence heterogeneity
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2760(89)90292-0
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  • 6
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary diffraction analysis of porcine heart mitochondrial NADP+-dependent isocitrate dehydrogenase (1996)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 1024-1026 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Isocitrate dehydrogenases [isocitrate:NAD(P)+ oxidoreductase (decarboxylating), E.C. 1.1.1.42] are ubiquitous metabolic enzymes which occur in all living organisms. The NADP+- dependent mitochondrial isocitrate dehydrogenase from pig heart has been crystallized from polyethylene glycol/sodium sulfate mixtures in the presence of Mg2+ and isocitrate. The crystals belong to space group C2 with a = 137.0, b = 113.4, c = 65.0 Å and β = 98.5°, and diffract to at least 2.4 Å resolution. There are two protein monomers per asymmetric unit which are related by non-crystallographic twofold symmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444996006154
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  • 7
    Electronic Resource
    Electronic Resource
    Silicon nitride nano-powders prepared by double-beam optical stimulation
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 193 (1994), S. 201-205 
    Details
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4526(94)90013-2
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  • 8
    Electronic Resource
    Electronic Resource
    Electrical and structural properties of the YBCO superconducting-semiconducting interface
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 194-196 (1994), S. 2143-2144 
    Details
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4526(94)91571-7
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  • 9
    Electronic Resource
    Electronic Resource
    NMR study of low-pressure ^1^2^9Xe gas
    Amsterdam : Elsevier
    Chemical Physics Letters 194 (1992), S. 440-445 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(92)86079-W
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  • 10
    Electronic Resource
    Electronic Resource
    Quantitative Flow Visualization (1998)
    Springer
    Meccanica 33 (1998), S. 503-516 
    Details
    ISSN: 1572-9648
    Keywords: Flow visualization ; Speckle photography ; Particle image velocimetry ; Turbulence ; Fluid mechanics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Modern developments in laser and computer technology, electronic cameras, and digital image processing techniques allow to generate planar distributions of quantitative data in turbulent flows. Large amounts of data can be processed easily and analyzed statistically. With these tools, it is possible to quantitatively visualize turbulent coherent structures, even in flows of high Reynolds number, and measure characteristic spatial quantities like vorticity, length scales, spatial correlation functions, etc. These potentials in analyzing spatial characteristics of turbulent flows are demonstrated with two different methods of quantitative flow visualization: speckle photography as a representative of the line-of-sight methods, and particle image velocimetry belonging to the methods that rely on the scattering of laser light from tracer particles. Sommario.I moderni sviluppi nelle tecnologie del laser e dei computers, delle telecamere elettroniche e le tecniche di analisi digitale delle immagini permettono di ottenere distribuzioni quantitative, in un piano, di dati relativi a flussi turbolenti. Una gran quantità di dati può essere con facilità analizzata statisticamente. Con questi mezzi è possibile visualizzare quantitativamente strutture coerenti turbolente anche in flussi da alto numero di Reynolds, e misurare caratteristiche spaziali, come vorticità scale e funzioni di correlazione. Questa potenzialità di studiare caratteristiche spaziali di flussi turbolenti viene qui mostrata per due differenti metodi di visualizzazione quantitativa: fotografia ‘speckle’ e PIV (particle image velocimetry).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004372627123
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