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  • 1
    Electronic Resource
    Electronic Resource
    A new Picture for the Galaxy Formation (1999)
    Springer
    Astrophysics and space science 265 (1999), S. 425-426 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The observational constraints are of fundamental importance to build a realistic chemical evolution model. With respect to these constraints the last years have been of crucial importance and, in the case of the Milky Way, the new observational data required a revision of the previous chemical evolution models (see Chiappini et al., 1997 – CMG97) and Pagel and Tautvaisiene, 1995 – PT95). The results obtained by CMG97 from a careful comparison between model predictions and observational constraints strongly suggest that the previously adopted picture for the Galaxy formation in which the gas shed from the halo was the main contributor to the thin disk formation, is not valid anymore. With our detailed chemical evolution model we are able to put some constraints on the IMF variation and on the Deuterium primordial value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002190011837
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  • 2
    Electronic Resource
    Electronic Resource
    LTE/non-LTE boundary from wide-band color index and bolometric correction comparison (1979)
    Springer
    Astrophysics and space science 60 (1979), S. 119-124 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract LTE/non-LTE boundary has been derived from the analysis of the flux data from atmospheric models. The derived border line seems to be like a reasonable extension at low logg's of the Kudritzki line (Kudritzki, 1976), derived in a similar way. A discrepancy is evidenced between boundaries based on photometric analysis and the ones based on physical considerations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648247
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  • 3
    Electronic Resource
    Electronic Resource
    The Chemical Evolution of the Galactic Bulge (1999)
    Springer
    Astrophysics and space science 265 (1999), S. 311-318 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we review the chemical evolution models for the Galactic bulge: in particular, we discuss the predictions of models as compared with the available abundance data and infer the mechanism as well as the time scale for the formation of the Galactic bulge. We show that good chemical evolution models reproducing the observed metallicity distribution of stars in the bulge predict that the [α/Fe] 〉0 over most of the metallicity range. This is a very important constraint indicating that the bulge of our Galaxy formed at the same time and even faster than the inner Galactic halo. We also discuss predictions for the evolution of light elements such as D and 7Li and conclude that the D astration should be maximum due to the high star formation rate required for the bulge whereas the evolution of the abundance of Li should be similar to that observed in the solar neighbourhood, but with an higher Li abundance in the interstellar medium at the present time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002172113229
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  • 4
    Electronic Resource
    Electronic Resource
    The Formation Of Chemical Elements And Their Abundances In The Solar System (1999)
    Springer
    Earth, moon and planets 85-86 (1999), S. 245-252 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The Earth and the Moon are related by their common origin in the solar system, as proven by their chemical composition. In this paper I review the current ideas about the formation and evolution of the chemical elements and compare model predictions with the solar system abundances. From this comparison we can constrain the history of formation of the solar vicinity regions as well as the nucleosynthesis theories concerning the Big Bang and the stars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017076117430
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  • 5
    Electronic Resource
    Electronic Resource
    Investigation on the operating, variables of potato starch fermentation by Schwanniomyces castellii (1983)
    Springer
    Applied microbiology and biotechnology 18 (1983), S. 92-99 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The fermentation of potato starch by Schwanniomyces castellii IMAT 3754 was studied at differentsubstrate concentrations, pH values, and nutrient supplementation in a shaken-flask fermenter in a composite design experiment. The experimental biomass yields were fitted to the only two significant factors (“substrate inhibition” and “nutritional” factors) with a mean percentage error smaller than 10% by means of multiple regression analysis. The optimal conditions for maximum cell yield were first established experimentally, and then applied to other starchy materials, such as soluble maize starch, maize starch, tapioca and rice flour. They were then scaled-up in a laboratory fermenter, thus allowing a preliminary kinetic analysis of this fermentation process to be performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500830
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of infection of mice with Friend leukemia complex viruses on background antibody-forming cell production in vitro (1978)
    Springer
    Cellular and molecular life sciences 34 (1978), S. 1161-1162 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Friend leukemia complex (FLC) and Rowson-Parr virus (RPV) infections of donor mice depress the production of background antibody-forming cells by splenocytes cultured in the absence of specific antigenic stimulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01922931
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  • 7
    Electronic Resource
    Electronic Resource
    Orbital forcing in a stochastic resonance model of the Late-Pleistocene climatic variations (1989)
    Springer
    Climate dynamics 3 (1989), S. 179-190 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Applying a number of simplifying assumptions, we have used a zero-dimensional energy balance climate model (EBM) of the Budyko-Sellers type to investigate the degree to which the climatic variability of the Late Pleistocene can be explained by the mechanism of stochastic resonance. As a logical extension of an earlier version of this model we have included a more complete representation for the orbital forcings to show that a reasonably good agreement with the paleoclimatic record can be obtained. This zerodimensional EBM is appealing because of its simplicity and its ability to reproduce some of the most striking qualitative features of the observed climatic variability with a very limited number of parameters, several of which can be derived from either the observations or general circulation model (GCM) simulations of ice-age conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058234
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  • 8
    Electronic Resource
    Electronic Resource
    A study of the climatic regimes of the Pleistocene using a stochastic resonance model (1991)
    Springer
    Climate dynamics 6 (1991), S. 67-81 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A global energy balance model employing the stochastic resonance mechanism, previously used to explain the climatic variability of the late Pleistocene, has now been extended to account for the climatic variations over the full Pleistocene. The possibility that extremely long-term changes (of the order of millions of years) in the boundary conditions of the climate system have altered the response of the Pleistocene climate to the external orbital forcing has been investigated. It is shown that, by slowly changing the only free parameter of the model, the system can undergo a pitchfork bifurcation. The bifurcation point separates a linear regime (identified with the early Pleistocene climate) from a strongly nonlinear regime (the late Pleistocene) where the stochastic resonance mechanism produces rapid and symmetric transitions between the two stable steady states of the system. The main differences in the dynamic features of the two regimes are the change in amplitude of the oscillations, the relative importance of the stochastic forcing, the change in shape of the probability distribution, and the corresponding change in the power centered around the 100000 year cycle: in qualitative agreement with the observed geological record. With the introduction of the external orbital forcing, now spectrally complete and included without requiring any additional hypothesis, the model reproduces the previous results, namely the good correlation with the isotopic record, the appearance of the dominant spectral peaks, as well as the “redness” of the power spectrum. In particular, it is shown that the orbital forcing in eccentricity acts as a pacemaker of the major glacial cycles of the late Pleistocene through the mechanism of stochastic resonance. A stochastic sensitivity analysis is then applied to validate the significance of the results and to investigate the predictability of the climate system over the time-scales of the orbital cycles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209981
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of the probability distribution of the late Pleistocene climatic record implications for model validation (1990)
    Springer
    Climate dynamics 5 (1990), S. 35-52 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Some statistical properties of the late Pleistocene climatic changes, as inferred from the analysis of the Probability Density Function (PDF) of the deep-sea δ18O record, are discussed. Estimates of the probability distribution of the SPECMAP record seem to reveal a bimodal character over the last 600 000 years BP, with a transition to a unimodal distribution for a longer time interval. Based on knowledge of the accuracy of the measurements, we try to remove the arbitrariness of such estimates, and by employing a number of different estimators we show that the major features observed are not affected by the particular method used. Possible dynamic interpretations are discussed. The abruptness of many transitions between the two modes and their symmetric occurrence seem to be significant features of the past climatic changes, which should be reproduced by climate models. The distribution of this indicator is then used to compare the performances of two climate models. Various statistical tests are employed and it is shown that, for a proper determination of the physical significance of such tests, information about the accuracy and reliability of the data must be included. For example, the comparison of two generalized isotopic curves, independently developed, shows a correlation coefficient of the order of 70%; therefore any account of the variance of any particular target curve beyond this level cannot be considered significant. These types of analyses suggest how the standard data evaluation and model validation techniques can be improved when discussing the essential features of observed and simulated dynamical systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195852
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  • 10
    Electronic Resource
    Electronic Resource
    Early events of liver regeneration in rats: a multiparametric analysis (1996)
    Springer
    Histochemistry and cell biology 105 (1996), S. 61-69 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract 5-Bromodeoxyuridine (BrdU), a synthetic analogue of thymidine, has been utilized in vivo to detect the proliferation which occurs in the liver after two-thirds surgical hepatectomy. Immunocytochemical detection of BrdU incorporation has been carried out at both the morphological and flow cytometrical level, while structural changes of regenerating liver have been investigated, using Mallory-Azan-stained paraffin sections, by means of an image analyser. The results obtained show that in vivo DNA synthesis progression throughout S phase follows a pattern similar to that previously described in vitro in both 3T3 fibroblasts and Friend erythroleukemia cells and also demonstrate a precise correlation between morphological patterns of BrdU incorporating cells and their lobular distribution. Moreover, the activation of at least two proliferation waves can be detected from 18 to 34 h after hepatectomy: the former, starting from adjacent regions of contiguous lobules, apparently induces an irregular increase of lobular dimension; the latter, involving both inner and peripheral lobular domains, seems to be correlated with the appearance of nodule-like structures at the lobule periphery. In view of these results the role of the hepatic acinus and the hypothesis of a streaming of parenchymal cells during liver regeneration have been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01450879
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