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  • Springer  (108)
  • 2005-2009  (71)
  • 1990-1994  (37)
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  • 1
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    Carbon sequestration in Spanish Mediterranean forests under two management alternatives: a modeling approach (2008)
    Springer
    Details
    Publication Date: 2008-01-08
    Print ISSN: 1612-4669
    Electronic ISSN: 1612-4677
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    The solar causes of major geomagnetic storms (1994)
    Springer
    Annales geophysicae 12 (1994), S. 113-120 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract In this paper we reanalyse the set of ten major geomagnetic storms which occurred between August 1978 and December 1979. We relate them to the characteristics of the solar wind disturbances which caused them and the solar sources of such disturbances as tracked by means of interplanetary scintillation. It seems to us that the shock causing the sudden commencement and the plasma behind it with an important long-lasting Bz south component (Bz
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-994-0113-5
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  • 3
    Electronic Resource
    Electronic Resource
    Elemental and morphological analyses of atmospheric particles from southwestern part of Mexico City (1993)
    Springer
    Bulletin of environmental contamination and toxicology 51 (1993), S. 247-254 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198888
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  • 4
    Electronic Resource
    Electronic Resource
    Evolution of polar coronal holes and sunspots during cycles 21 and 22 (1994)
    Springer
    Solar physics 154 (1994), S. 377-384 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A very good correlation between the evolution of polar coronal hole size and sunspot number half a solar cycle later was found by Bravo and Otaola for solar cycle 21. In this paper we use a more complete set of data to reanalyse the relationship for solar cycle 21 and investigate the same relationship for solar cycle 22. We find that the complete set of data for cycle 21 yields a slightly different time shift for the best correlation between sunspots and holes and that the time shift for cycle 22 is different from that of cycle 21. However, because of limited availability of data of cycle 22, we consider it necessary to wait until the end of this cycle in order to decide if the difference is statistically significant or not. We also found that the time between successive peaks of smoothed polar hole area and smoothed sunspot number is the same in both cycles. This may provide a useful tool for the forecasting of future sunspot maxima. The constant of proportionality between polar coronal hole area and sunspot number can be seen to be different in both cycles. We discuss this difference and interpret it in terms of a different magnitude of the polar field strength in the two cycles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681106
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  • 5
    Electronic Resource
    Electronic Resource
    Characteristics of coronal mass ejections associated with interplanetary shocks (1994)
    Springer
    Solar physics 151 (1994), S. 333-339 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In a correlated study using coronagraph and interplanetary data from 1978 to 1983, a set of 56 coronal mass ejections (CMEs) was confidently associated with interplanetary shocks by Sheeleyet al. (1985). In this paper we analyze the characteristics of these particular CMEs in contrast to the whole population of them during the period. We find that the associated CMEs are not a representative sample of all the variety of CMEs and that they share specific characteristics. Contrary to common beliefs, these characteristics are not a high velocity or a large extension, but have more to do with the importance and shape of the CME. Practically all the CMEs associated with shocks were of importance Y (bright and/or large) and had a curved-type front structural class (a continuous curved front with either straight edges or curved legs). Another common characteristic of these particular CMEs is that they show a considerable increase in their angular span as they go out from the Sun, moving the peak of the distribution from ≃30° to ≃70°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00679079
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  • 6
    Electronic Resource
    Electronic Resource
    Efficiency of insecticidal crystal protein production in a Bacillus thuringiensis mutant with derepressed expression of the terminal oxidase aa 3 during sporulation (1993)
    Springer
    Applied microbiology and biotechnology 39 (1993), S. 558-562 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A Bacillus thuringiensis respiratory mutant (AB1 strain) that shows premature sporulation and insecticidal crystal protein (ICP) production was isolated. The mutant strain harbours the cryIC and cryID insecticidal genes and could be important for the production of ICP highly toxic to Spodoptera sp. The mutant was selected by its increased capacity to oxidize. N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD). In this strain, cytochrome aa 3 expression is not repressed during the sporulation phase, in contrast with the wild-type strain. The growth, spore production, dissolved O2, O2 consumption, CO2 evolution rate and ICP production were recorded as a function of time. The AB1 mutant strain has a similar growth yield to the wild-type strain, but begins sporulation at least 4 h earlier. The AB1 strain consumes 74.5% more O2 than the wild-type strain, during the fermentation process. The mutation on strain AB1 has an important positive effect on ICP production. This procedure shows that ICP production could be increased during fermentation by increasing the respiration capacity of Bacillus thuringiensis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00205051
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  • 7
    Electronic Resource
    Electronic Resource
    Lateral diffusion of polarly transported indoleacetic acid and its role in the growth of Lupinus albus L. hypocotyls (1991)
    Springer
    Planta 185 (1991), S. 391-396 
    Details
    ISSN: 1432-2048
    Keywords: Auxin metabolism, transport ; Elongation growth ; Cortex-stele auxin distribution ; Lupinus (auxin transport) ; Polar auxin transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The transport and metabolism of indole-3-acetic acid (IAA) was studied in etiolated lupin (Lupinus albus L, cv. Multolupa) hypocotyls, following application of dual-isotope-labelled indole-3-acetic acid, [5-3H]IAA plus [1-14C]IAA, to decapitated plants. To study the radial distribution of the transported and metabolized IAA, experiments were carried out with plants in which the stele was separated from the cortex by a glass capillary. After local application of labelled IAA to the cortex, radioactivity remained immobilized in the cortex, near the application point, showing that polar transport cannot occur in the outer tissues. However, following application of IAA to the stele, radioactivity appeared in the cortex in those hypocotyl sections below the first 1 cm (in which the capillary was inserted), and the basipetal IAA movement was similar to that observed after application of IAA to the complete cut surface. In both assays, longitudinal distribution of 14C and 3H in the stele outside the first 1 cm was positively correlated with that of cortex, indicating that there was a lateral migration of IAA from the transport pathway (in the stele) to the outer tissues and that this migration depended on the amount of IAA in the stele. Both tissues (stele and cortex) exhibited intensive IAA metabolism, decarboxylation being higher in the stele than in the cortex while IAA conjugation was the opposite. Decapitation of the seedlings caused a drastic reduction of hypocotyl growth in the 24 h following decapitation, unless the hypocotyls were treated apically with IAA. Thus, exogenous IAA, polarly transported, was able to substitute the endogenous source of auxin (cotyledons plus meristem) to permit hypocotyl growth. It is proposed that IAA escapes from the transporting cells (in the stele) to the outer tissues in order to reach the growth-responsive cells. The IAA metabolism in the outer tissues could generate the IAA gradient necessary for the maintenance of its lateral flow, and consequently the auxin-induced cell elongation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00201062
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  • 8
    Electronic Resource
    Electronic Resource
    Uptake and decarboxylation of indole-3-acetic acid during auxin-induced growth in lupin hypocotyl segments (1994)
    Springer
    Planta 193 (1994), S. 224-231 
    Details
    ISSN: 1432-2048
    Keywords: Acid-growth theory ; ATPase ; auxin (uptake, decarboxylation) ; Growth (auxin induced) ; Lupinus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The elongation growth of etiolated hypocotyl segments of lupin (Lupinus albus L.) was stimulated by acid pH (4.6 versus 6.5) and by IAA for periods of up to 4 h. After this time, the segments were unable to grow further. In the presence of an optimal IAA concentration (10 μM), acid pH increased the growth rate but had no effect on final growth. With suboptimal IAA (0.1 μM), however, acid pH increased growth in a more than additive way, suggesting a synergistic action between the two factors. This synergism may be explained by the increased IAA uptake and decarboxylation seen at an acid pH. These results reinforce the view that the effects of low pH and IAA on growth are not independent. Vanadate inhibited growth and also IAA uptake and decarboxylation. This inhibitor, therefore, probably inhibits growth not only by decreasing ATPase-mediated acidification but also by decreasing H+-dependent IAA uptake from the apoplasm. This dependence of IAA uptake on ATPase may be mediated by apoplasmic acidification. The amount of IAA decarboxylated increased when the assay conditions favored the growth of segments, indicating that IAA could be destroyed by decarboxylation during the auxin-induced growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192534
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  • 9
    Electronic Resource
    Electronic Resource
    In vitro immuno-cytotoxicity of iron evaluated by DNA synthesis of human T lymphocytes stimulated via CD2 and CD3 (1993)
    Springer
    Journal of materials science 4 (1993), S. 366-371 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: In previous studies it was demonstrated that the in vitro exposure of human lymphocytes to iron, nickel or cobalt salts causes a significant reduction of lymphocytes expressing CD2 and CD3 surface antigens. Since both molecules are involved in T lymphocyte activation, these studies suggest that the above metals might affect T-cell activation and proliferation. Thus a method was developed for the stimulation of lymphocytes in which both CD2 and CD3 molecules were triggered simultaneously. For this purpose an anti-CD3 monoclonal antibody (mAb) was chemically bound to human erythrocytes (HE), forming HEαCD3 conjugates, which were used for lymphocyte stimulation. In this work the effects of iron on lymphocyte proliferation was studied, following stimulation via CD2 and CD3, in order to evaluate the immuno-cytotoxicity of iron. Increasing concentrations (5×10-3 μm-102 μm) of iron citrate (Fe-citrate) showed that the higher concentration range (10 μm-102 μm) caused moderate inhibitions of lymphocyte DNA synthesis (ranging between 18.3% and 78.6%). Furthermore the presence of monocytes in culture did not interfere in the inhibitory effect of Fe-citrate. Phenotypic characterisation of DNA-synthesizing cells in the presence of Fe-citrate showed that the CD8+ (suppressor/cytotoxic) subset was the most reduced one. This study showed that iron inhibited T lymphocyte proliferation, particularly the suppressor/cytotoxic cells, suggesting that the presence of high levels of iron in in vivo situations can cause immunosuppression and, consequently, contribute to the onset of opportunistic infections and tumours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00122194
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  • 10
    Electronic Resource
    Electronic Resource
    Nucleosynthesis in SNIa (1990)
    Springer
    Astrophysics and space science 169 (1990), S. 19-24 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The final products of a SNIa explosion critically depend on the degree of neutronization of the incinerated material and on the total amount of burned material. Here we study their dependence on the velocity of the burning front and on the density at which the thermonuclear runaway starts. The abundances of54Cr,54, 58Fe,58, 62Ni provide some constraints to the possible values of model parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00640679
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