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  • Articles  (38)
  • Other Sources
  • Springer  (24)
  • American Physical Society  (8)
  • International Union of Crystallography  (6)
  • AGU (American Geophysical Union)
  • 2015-2019
  • 2010-2014
  • 1990-1994  (28)
  • 1985-1989
  • 1980-1984  (10)
  • 1993  (28)
  • 1980  (10)
  • Physics  (22)
  • Biology  (20)
  • Mathematics  (2)
  • Medicine  (2)
  • Architecture, Civil Engineering, Surveying
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  • Articles  (38)
  • Other Sources
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Publisher
Years
  • 2015-2019
  • 2010-2014
  • 1990-1994  (28)
  • 1985-1989
  • 1980-1984  (10)
Year
Journal
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Harris lines and ethanol consumption during growth period (1993)
    Springer
    International journal of anthropology 8 (1993), S. 21-25 
    Details
    ISSN: 1824-3096
    Keywords: Ethanol consumption Harris lines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447639
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460296
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  • 3
    Electronic Resource
    Electronic Resource
    The kinetics of enzyme systems involving activation of zymogens (1993)
    Springer
    Bulletin of mathematical biology 55 (1993), S. 561-583 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460651
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  • 4
    Electronic Resource
    Electronic Resource
    First observation of lasing at 231 Å in neon-like nickel using the prepulse technique (1993)
    Springer
    Applied physics 57 (1993), S. 309-311 
    Details
    ISSN: 1432-0649
    Keywords: 42.60.By ; 32.30.Rj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report lasing for the first time in nickel on the neon-like J=0→1, 3p→3s transition at 231 Å as well as several weaker transitions including the J=2»1 lines at 298 Å and 304 Å. Amplification is seen only when the prepulse technique of using a low intensity prepulse before the main optical drive pulse is used to illuminate the nickel target. The prepulse technique is also shown to produce lasing in copper and dramatically improve the output of the germanium laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332454
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  • 5
    Electronic Resource
    Electronic Resource
    Induction of ajmalicine formation and related enzyme activities in Catharanthus roseus cells: effect of inoculum density (1993)
    Springer
    Applied microbiology and biotechnology 39 (1993), S. 42-47 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract In Catharanthus roseus cell cultures the time courses of four enzyme activities, tryptophan decarboxylase (TDC), strictosidine synthase (SSS), geraniol-10-hydroxylase (G10H) and anthranilate synthase (AS), and alkaloid accumulation were compared under two different culture conditions (low-inoculum density and high-inoculum density on induction medium) and a control on growth medium. In growth medium a transient increase in TDC activity was first observed after which G10H reached its maximum activity; only tryptamine accumulated, no ajmalicine could be detected. Apparently, a concerted induction of enzyme activities is required for ajmalicine formation. Cells inoculated in induction medium showed such a concerted induction of AS, TDC and G10H activities. After 30 days the low-density culture had accumulated six times more ajmalicine (in μmoles/g) than the high-density culture. Thus, increase in biomass concentration (high-density cultures) did not enhance the total alkaloid production. The major differences observed in enzyme levels between high-and low-density cultures were in the AS and TDC activities, which were two to three times higher in the low-density culture, indicating that there is a positive correlation between ajmalicine formation and AS and TDC activities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166846
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  • 6
    Electronic Resource
    Electronic Resource
    Are there fast-rotating giant active longitudes ? (1993)
    Springer
    Solar physics 144 (1993), S. 399-402 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The distribution of significant solar activity for the northern and southern solar hemispheres from 1964 through 1979 is studied. Two 90-degree wide active longitudes, separated 180 degrees and rotating with a velocity 1% faster than the solar surface, are proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00627603
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  • 7
    Electronic Resource
    Electronic Resource
    Demography of Adenostoma fasciculatum after fires of different intensities in southern California chaparral (1993)
    Springer
    Oecologia 96 (1993), S. 95-101 
    Details
    ISSN: 1432-1939
    Keywords: Fire intensity ; Adenostoma fasciculatum ; Lignotuber ; Resprouting ; Herbivory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes in the population structure of the lignotuberous resprouter Adenostoma fasciculatum were investigated by experimentally burning at various intensities an old stand in southern California chaparral. Survival after fire, time of resprouting, herbivory, and survival after resprouting were monitored for more than 1 year after the fire. Greater fire intensity increased plant mortality and the size of plants that died as a consequence of the fire. Time from the fire until resprouting increased with increasing fire intensity and was related to plant size: the larger the plants the earlier they resprouted. Post-resprouting mortality also increased with fire intensity and was related to time of resprouting. Herbivory increased with fire intensity and the size of plants affected by it changed with the intensity of the fire. Fire intensity had profound direct and indirect effects on the population structure of Adenostoma fasciculatum. Plant size strongly determined the direct and indirect lethal effects of fire.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318035
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of terpenoid precursor feeding and elicitation on formation of indole alkaloids in cell suspension cultures of Catharanthus roseus (1993)
    Springer
    Plant cell reports 12 (1993), S. 702-705 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of terpenoid precursor feeding and elicitation by a biotic elicitor on alkaloid production of Catharanthus roseus suspension cultures were studied. After addition of secologanin, loganin or loganic acid an increase in the accumulation of ajmalicine and strictosidine and a decrease of tryptamine level was observed in non-elicited cells. Elicitation increased tryptamine accumulation in non-fed cells but it did not further increase alkaloid accumulation in precursor-fed cells. A decrease of tryptamine level was also observed, despite the induction of the tryptamine pathway after elicitation. Feeding mevalonic acid did not increase alkaloid accumulation in any studied case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233423
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  • 9
    Electronic Resource
    Electronic Resource
    A model for non-linear processing in cat's retina (1980)
    Springer
    Biological cybernetics 37 (1980), S. 25-31 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The model is based on the concept that non-linear lateral interaction at the inner plexiform layer accounts for most of the specialization and marked non-linearities in cat's retinal ganglion cell responses. The inputs to the lateral interaction processes are a spatio-temporal signal and its retarded, as suggested by the behaviour of simple ganglion cells. Lateral interaction in the model consists of lateral linear inhibition followed by local half wave rectification. The resulting signals are weighted and summated by the ganglion cell thereafter. A transparent and general expression is obtained for the response of the cell model which, albeit its simplicity, leads to most of known types of non-linear responses, including the rarely encountered specialized cells in cat's, retina, except colour coding units. For negligible lateral interaction, the model reduces to spatio-temporal linear models under the two paths hypothesis. A discussion of the possible role of anatomical units in these retinal processes in presented, where a general interpretation for visual processing in cat's retina evolves from.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347639
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  • 10
    Electronic Resource
    Electronic Resource
    A layered model for visual processing in avian retina (1980)
    Springer
    Biological cybernetics 38 (1980), S. 85-89 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Visual processing in avian retina is interpreted by means of a layered model in which: a) outer layers provide with spatio temporal fast and retarded versions of the stimuli incident on the retina; a possibility is that horizontal cells are involved in isotropically generating the retarded version which is transversally translated; b) prominent specialization of ganglion cells is the result of local non-linear lateral interaction at the inner plexiform layer, mediated by amacrines which return, also isotropically, the translated retarded signals. Small though systematic deviations in the sites of the lateral interaction result in anisotropic but uniform receptive fields for some ganglion cells. A simple though general expressin for the model is derived which includes the various types of recorded avian ganglion retinal cells responses, which also permits a unified interpretation of visual processing in avian and cat's retinae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356034
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