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  • 1
    Electronic Resource
    Electronic Resource
    Importance of the vertical nutrient flux for biological production in the equatorial undercurrent region at 30°W (1979)
    Springer
    Marine biology 55 (1979), S. 23-27 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An attempt is made to estimate the effects of vertical transport mechanisms by means of chemical and biological parameters. Compared with coastal upwelling effects (e.g. at Cap Blanc, North-West Africa) the vertical transport mechanisms in the equatorial undercurrent region at 30° W have only a slight effect in terms of their biological consequences. It is concluded that the role played by turbulent exchange in the flow of nutrients is greater than that played by the mean vertical velocity in the undercurrent region at 30° W.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391713
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  • 2
    Electronic Resource
    Electronic Resource
    Picosecond Spectroscopy of Molecular Dynamics in Liquids (1975)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 26 (1975), S. 83-99 
    Details
    ISSN: 0066-426X
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pc.26.100175.000503
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrate reductase in Zea mays L. under salinity (2000)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 23 (2000), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Young maize seedlings (Zea mays L. cv.Giza 2) were exposed to moderate salinity in hydroponic culture. NADH-nitrate reductase (NR) activity (E.C. 1·6.6·1), NR activation state, NR-mRNA-steady state levels and major solute contents in leaves and roots were investigated. With increasing external salt concentration, Na+, Cl−, sugars, amino acids and quarternary ammonium compounds accumulated in leaves and roots, with concentrations in leaves exceeding those in roots. The nitrate content of leaves decreased, but increased in roots. The diurnal pattern of NR activity and of NR-mRNA was also changed under salinity, but the NR activation state was not affected. In the first light phase, maximum NR activity increased rapidly in leaves of control plants, but was much slower in leaves from salinized plants. Thus, integrated over the whole day, the NR activity of salt-stressed plants was lower than in control plants. NR transcript levels of control plants were low in the early night phase, started to increase in the second night phase, followed by a distinct peak at 2 h into the light period. This large ‘early morning peak’ of NR-mRNA was hardly affected by salinity, whereas the initial slow increase of m-RNA levels in the early night phase was almost absent in salinized plants. This is considered as one reason for the low NR activity of salinized plants in the first half of the day. It is also suggested that nitrate is a major signal affecting NR expression and activity under salinity. Sugars and amino acids appeared less important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2000.00568.x
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrasound Bone Densitometry of the Os Calcis in Children and Adolescents (2000)
    Springer
    Calcified tissue international 67 (2000), S. 349-355 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Ultrasound bone densitometry — Children — Sex — Weight — Height
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. The aim of the present investigation was to evaluate reference data and to examine whether there were weight-, height-, age-, and sex-related differences of the quantitative ultrasound bone parameters for healthy children and adolescents. A total of 3299 healthy Caucasian children and teenagers (1623 girls and 1676 boys), age range from 6–18 years (mean age 11.4 ± 3.4 years for boys and mean age 11.5 ± 3.3 years for girls) were examined by quantitative ultrasound densitometry (QUS) using the bone sonometer SAHARA (Hologic Inc., Waltham, MA, USA), a waterless, dry system. The parameters broadband ultrasound attenuation (BUA) [dB/MHz] and speed of sound (SOS) [m/second] were evaluated on the right heel in relation to age, sex, weight, and height. There is no correlation between the ultrasound bone parameter SOS and age, height, and weight. BUA increases with age, height, and weight. Significant differences in SOS and BUA between girls and boys were found to probably be caused by the different onset of growth phases and the onset of puberty. SOS and BUA are influenced by changes of bone mineral density. But BUA is dependent on bone size, too. In conclusion, ultrasound bone densitometry is a useful measuring method showing the physiological bone development in childhood and adolescence. The presented results can be used as reference data. Further studies in children with disorders influencing bone metabolism will show in what way various patterns of osteopenia in childhood can be detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002230001143
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  • 5
    Electronic Resource
    Electronic Resource
    Rundschau (1978)
    Springer
    Journal of pest science 51 (1978), S. 42-46 
    Details
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01903217
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  • 6
    Electronic Resource
    Electronic Resource
    Carbon metabolism of chloroplasts in the dark: Oxidative pentose phosphate cycle versus glycolytic pathway (1979)
    Springer
    Planta 144 (1979), S. 193-200 
    Details
    ISSN: 1432-2048
    Keywords: Carbon metabolism ; Chloroplasts ; Darkness ; Glycolytic pathway ; Oxidative pentose phosphate cycle ; Spinacia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The conversion of U-labelled [14C]glucose-6-phosphate into other products by a soluble fraction of lysed spinach chloroplasts has been studied. It was found that both an oxidative pentose phosphate cycle and a glycolytic reaction sequence occur in this fraction. The formation of bisphosphates and of triose phosphates was ATP-dependent and occurred mainly via a glycolytic reaction sequence including a phosphofructokinase step. The conversion, of glucose-6-phosphate via the oxidative pentose phosphate cycle stopped with the formation of pentose monophosphates. This was found not to be because of a lack in transaldolase (or transketolase) activity, but because of the high concentration ratios of hexose monophosphate/pentose monophosphate used in our experiments for simulating the conditions in whole chloroplasts in the dark. Some regulatory properties of both the oxidative pentose phosphate cycle and of the glycolytic pathway were studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387270
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  • 7
    Electronic Resource
    Electronic Resource
    Generation of picosecond light continua by parametric four-photon interactions in liquids and solids (1977)
    Springer
    Optical and quantum electronics 9 (1977), S. 315-349 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Light continua extending from the i.r. to the u.v. are generated with picosecond laser pulses in liquids and solids. It is demonstrated that the light spectra in water are produced by stimulated parametric fourphoton interactions, which are resonantly enhanced by single and difference frequency resonances of the non-linear susceptibilityχ (3). A theory of the various parametric four-photon interaction processes is developed and the resonant structure ofχ (3) is discussed. The experimental results are compared with theoretical calculations. The generation of light continua by other nonlinear optical processes is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619531
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  • 8
    Electronic Resource
    Electronic Resource
    Nuclear levels in152Eu (1978)
    Springer
    The European physical journal 286 (1978), S. 341-380 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The transitional nucleus152Eu has been studied using the (n, e), (n, γ), (n res,γ), (n, γγ), (d, p), (d, t) and (p, d) reactions. The experiments have been performed at nine different laboratories. A model independent level scheme was established including 95 levels below 510 keV and nearly 900 transitions by combination of low energy transitions and reaction data. More than 20 additional levels result from gamma rays and/or charged particle reactions. The level scheme is interpreted in terms of the Nilsson model indicating that152Eu is a deformed nucleus. Seven rotational bands and Nilsson configurations are established. An additional 27 rotational bands are tentatively or speculatively assugned. Gallagher-Moszkowski splittings are discussed. The neutron binding energy was determined as 6305.2±0.5 keV. The energy of the 9.3 h 0− isomer is 45.599 keV. The lifetimes of four levels were measured. Nuclear Reactions151Eu(n,γ),E n =thermal and resonance; measuredE γ ,I γ ,E c.e.,I c.e.,γγ Coinc.,γγΔt coinc.;151Eu(d, p),E=12MeV and 14MeV;153Eu(d, t),E=12MeV;153Eu(p, d),E =18MeV; deduced level scheme of152Eu,J, π, T 1/2,cc, Nilsson configurations. Magnetic electron spectrometer, curved crystal spectrometer, Ge(Li) and Si(Li) detectors, magnetic spectrographs. Enriched targets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408894
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  • 9
    Electronic Resource
    Electronic Resource
    Nanosecond pulse propagation in a high power iodine laser amplifier (1976)
    Springer
    Optical and quantum electronics 8 (1976), S. 219-229 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Pulse propagation in a photochemical iodine laser amplifier is investigated both experimentally and by solving the Maxwell-Schrödinger equations by computer. Pulse shortening and pulse reshaping are observed in agreement with theory. For pulse durations approaching the dephasing time, it is found that a further decrease in duration by gain saturation is hard to obtain and requires high power levels or high initial inversion. The numerical analysis includes reservoir effects due to tightly coupled hyperfine levels in the iodine groundstate and phase modulation (chirping) of the input pulse. Comparison of the iodine parameters with those of Nd and CO2 lasers shows that for nanosecond pulses pulse shortening occurs more readily in the latter two systems in agreement with experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620203
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  • 10
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    Inelastic Neutron Scattering Measurements of Phonon Dispersion Curves in Reactor-Irradiated Aluminum at 4.6 K (1977)
    American Physical Society
    Details
    Publication Date: 1977-04-11
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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