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  • Springer  (26)
  • National Academy of Sciences  (4)
  • 2000-2004  (30)
  • 1945-1949
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  • 1
    Electronic Resource
    Electronic Resource
    Effects of leptonic CP violating phases in the left-right supersymmetric model (2003)
    Springer
    The European physical journal 28 (2003), S. 341-351 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We analyze the effects of CP violating phases in a fully left-right extension of the minimal supersymmetric model. These phases appear from both the heavy and light neutrino sectors: two CKM-type phases, and four Majorana phases. We study observable effects of these phases in lepton flavor violating decays, such as the T-odd asymmetry in $\mu^+ \rightarrow e^+e^+e^-$ , as well as in the leptonic electric dipole moments. We impose the experimental constraints from the mixing of light neutrinos and analyze cases in which the heavy and light neutrinos are either degenerate, or hierarchical, and highlight the dominant variables in each case. CP violating phases in both the heavy and light neutrino sectors of the left-right supersymmetric model have unique features which, if tested in the charged lepton sector, may distinguish the model from other supersymmetric scenarios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjc/s2003-01157-9
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of OH groups on the growth of rhodium on alumina: a model study (2000)
    Springer
    Catalysis letters 68 (2000), S. 19-24 
    Details
    ISSN: 1572-879X
    Keywords: aluminum oxide ; hydroxyl groups ; rhodium ; growth ; scanning tunneling microscopy ; infrared spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In order to investigate how the presence of surface hydroxyl groups on oxide surfaces affects the interaction with the supported metal, we have modified a well-ordered alumina film on NiAl(110) by Al deposition and subsequent exposure to water. This procedure yields a hydroxylated alumina surface as revealed by infrared and high-resolution electron energy loss spectroscopy. By means of scanning tunneling microscopy, we have studied the growth of rhodium on the modified film at 300 K. Clear differences in the particle distribution and density are observed in comparison to the clean substrate. While, in the latter case, decoration of domain boundaries as typical defects of the oxide film governs the growth mode, a more isotropic island distribution and a drastically increased particle density is found on the hydroxylated surface. From infrared data, it can be deduced that the growth is connected with the consumption of the hydroxyl groups due to the interaction between the metal deposit and the hydroxylated areas. This finding is in line with photoemission results published earlier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019058714724
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  • 3
    Electronic Resource
    Electronic Resource
    $\mu-e$ conversion in nuclei in the left-right supersymmetric model (2000)
    Springer
    The European physical journal 17 (2000), S. 501-512 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We investigate the contributions to $\mu - e $ conversion in nuclei in a supersymmetric model with left-right symmetry, motivated by the new data on neutrino oscillations. We study the dependence of the conversion rate on the various parameters of the model, and show that light-mass or large $\tan \beta$ scenarios are severely restricted. We analyse the effect of several popular mecahnisms of neutrino mixing on the conversion rate as well as the influence of the right-handed scale on the conversion rate. We compare the conversion rate to the branching ratio for $\mu \rightarrow e \gamma$ and discuss their relative accessibility at future experiments, their sensitivity to various parameters of the model, as well as their relative importance in providing signals for new Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520000482
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  • 4
    Electronic Resource
    Electronic Resource
    Duplication and Diversification of the Apolipoprotein CI (APOCI) Genomic Segment in Association with Retroelements (2000)
    Springer
    Journal of molecular evolution 50 (2000), S. 391-396 
    Details
    ISSN: 1432-1432
    Keywords: Key words: Apolipoprotein CI — Hepatic control region — Duplication — Alu — Retroelements — Diversity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. We have previously shown that several multicopy gene families within the major histocompatibility complex (MHC) arose from a process of segmental duplication. It has also been observed that retroelements play a role in generating diversity within these duplicated segments. The objective of this study was to compare the genomic organization of a gene duplication within another multicopy gene family outside the MHC. Using new continuous genomic sequence encompassing the APOE-CII gene cluster, we show that APOCI and its pseudogene, APOCI′, are contained within large duplicated segments which include sequences from the hepatic control region (HCR). Flanking Alu sequences are observed at both ends of the duplicated unit, suggesting a possible role in the integration of these segments. As observed previously within the MHC, the major differences between the segments are the insertion of sequences (approximately 200–1000 bp in length), consisting predominantly of Alu sequences. Ancestral retroelements also contribute to the generation of sequence diversity between the segments, especially within the 3′ poly(A) tract of Alu sequences. The exonic and regulatory sequences of the APOCI and HCR loci show limited sequence diversity, with exon 3 being an exception. Finally, the typing of pre- and postduplication Alus from both segments indicates an estimated time of duplication of approximately 37 million years ago (mya), some time prior to the separation of Old and New World monkeys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002399910042
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  • 5
    Electronic Resource
    Electronic Resource
    A labor market based theory of regional economic development (2000)
    Springer
    The annals of regional science 34 (2000), S. 131-145 
    Details
    ISSN: 1432-0592
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Notes: Abstract. The Borts and Stein (1964) theory of regional economic growth and development has been widely accepted and discussed in regional economic development literature. Given their assumption that labor demand conditions are invariant between regions and that the labor demand is highly wage elastic, they conclude that regional growth is primarily supply driven and differences in growth among regions arise due to differences in the growth of labor supply assuming that wage elasticity of labor supply is the same across regions. Muth (1968, 1971) claims to have verified the Borts and Steins (BS) conclusion. We propose a regional labor market based model of economic development similar to BS with certain modifications in assumptions and show that the Borts-Stein-Muth (BSM) conclusion is based upon a narrow view of labor demand and supply elasticities. Our theory demonstrates that regional development is mainly labor demand driven once we adopt a broader view of elasticities. The broader view incorporates the direct effect of wages on labor supply and labor demand as well as the indirect effects of wages through changes in inmigration and firms' formations in a region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001680050130
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  • 6
    Electronic Resource
    Electronic Resource
    Manufacturing technologies for miniaturized interference filters (2000)
    Springer
    Microsystem technologies 6 (2000), S. 77-81 
    Details
    ISSN: 1432-1858
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Technology
    Notes: Abstract  Miniaturized interference filters were designed and fabricated using two different manufacturing technologies. Applying micromachined ceramic masks during the coating processes interference filters with 1 mm lateral feature size and an alignment accuracy of 50 μm were arranged in an array consisting of three different filters. The filter edge definition obtained by this method was smaller than 50 μm. By applying ion assisted deposition (IAD), a low-temperature coating process, the spectral sensitivity of receiver cells has been modified by coating the cells directly. A combination of coating processes, microlithographic masking procedures, and dry etching technologies made it possible to arrange three different stripe filters with minimum filter features of about 5 μm side by side. The accuracy during mask alignment and the filter edge definition was also within 1 and 2 μm, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005420050001
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  • 7
    Electronic Resource
    Electronic Resource
    Butyrate inhibits proliferation-induced Proliferating Cell Nuclear Antigen expression (PCNA) in rat vascular smooth muscle cells (2000)
    Springer
    Molecular and cellular biochemistry 205 (2000), S. 149-161 
    Details
    ISSN: 1573-4919
    Keywords: vascular smooth muscle cell ; butyrate ; proliferation ; Proliferating Cell Nuclear Antigen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Arterial injury-induced vascular smooth muscle cell (VSMC) proliferation in intima is the important etiologic factor in vascular proliferative disorders such as atherosclerosis, hypertension and restenosis after balloon angioplasty. Butyrate, a naturally occurring short chain fatty acid, is produced by bacterial fermentation of dietary fiber and by mammary glands of certain mammals. Studies have shown that butyrate at millimolar concentrations, which are physiological, induces growth arrest, differentiation and apoptosis. We examined the effect of physiological concentrations of butyrate on rat VSMC proliferation and proliferation-induced PCNA expression to determine anti-atherogenic potential of butyrate. Butyrate concentrations, closer to physiological range, exhibited antiproliferative effects on both serum-induced proliferation of serum-starved quiescent VSMCs and actively proliferating non-confluent VSMCs. Treatment of serum-starved quiescent VSMCs with 1-8 mmol/l concentration of butyrate caused a concentration-dependent decrease in serum-induced VSMC proliferation and cell proliferation-associated increase in total cellular proteins and RNA levels. Similarly, exposure of actively growing VSMCs to 5 mmol/l butyrate resulted in the inhibition of cell proliferation and proliferation-induced increase in cellular proteins and RNA levels. Furthermore, cellular morphology was significantly altered. Analysis of cell cycle regulatory proteins indicated that levels of PCNA, an excellent marker for cell proliferation, was significantly altered by butyrate both in actively proliferating and serum-induced quiescent VSMCs. These observations suggest that butyrate exhibits potential antiatherogenic capability by inhibiting VSMC proliferation and proliferation-associated increase in PCNA expression and thus merits further investigations regarding therapeutic significance of butyrate in vascular proliferative disorders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007078200482
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  • 8
    Electronic Resource
    Electronic Resource
    Vertical rooting patterns of mature Quercus trees growing on different soil types in northern Germany (2000)
    Springer
    Plant ecology 147 (2000), S. 95-103 
    Details
    ISSN: 1573-5052
    Keywords: Nutrients ; Oak ; Roots ; Soil bulk density ; Soil chemistry ; Soil water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract At two different sites in northern Germany, the vertical distribution patterns of roots with diameters of up to 10 mm were investigated with the trench profile wall technique beneath mature trees of Quercus petraea (Matt.) Liebl. growing on clayey (cambi-stagnic gleysol) or sandy soil (dystric cambisol). The rooting patterns were related to soil bulk density, maximum plant-available soil water and soil chemistry, and were compared with the rooting pattern of Q. petraea growing on a silty soil on limestone (luvisol) and with that of Q. robur L. growing on clayey loam (stagnic cambisol). All three Q. petraea sites differed in their vertical rooting pattern, as was indicated by significant differences in the parameter β which was calculated from the cumulative root fraction (Y) for the cumulative rooting depth (d; Y=1−βd). At the clayey site, a relatively large fraction of roots was found in deeper soil layers (highest β value); whereas, at the silty site, the rooting pattern was most superficial (lowest β value). No significant difference in the vertical rooting pattern was observed between Q. petraea and Q. robur growing on clayey soil. The soil-area related biomasses of living roots did not differ between the clayey and the sandy site of Q. petraea.Comparisons of the rooting patterns with soil water relations and soil chemistry lead to the hypothesis that under the climatic conditions of Central Europe, the vertical root distribution of Q. petraea is more influenced by the availability of nutrients, especially that of nitrogen, than by the amounts of plant-available soil water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009841921261
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  • 9
    Electronic Resource
    Electronic Resource
    Leptonic dipole moments in the left-right supersymmetric model (2002)
    Springer
    The European physical journal 22 (2002), S. 727-741 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The observation of neutrino oscillations imposes a pattern of mixing in both the sneutrino and charged slepton sectors. On the other hand, the apparent 2.6 $\sigma $ deviation of the anomalous magnetic moment of the muon from the standard model value favors a scenario beyond the standard model. We show that, in a supersymmetric model with left-right symmetry, which provides an explanation for both phenomena, the relationship between flavor conserving dipole moments, such as the magnetic and the electric dipole moments, and flavor violating dipole moments, such as $\mu \rightarrow e \gamma, \tau \rightarrow \mu \gamma $ and $\tau \rightarrow e \gamma$ , is quite different from that in the MSSM. From general analytic considerations, we derive bounds on the fractional sneutrino mass splittings $\delta_{\tilde{\nu}_e \tilde{\nu}_{\mu}}^2/m_{\tilde \nu}^2 \le 1.5 \times 10^{-5}$ , and the fractional charged slepton splittings $\delta_{\tilde e \tilde{\mu}}^2/m_{\tilde l}^2 \le 2 \times 10^{-2}$ . For $\tilde{\mu}-\tilde{\tau}$ , the mixing is allowed to be maximal. We also comment on the magnitudes and correlations between CP-violating angles coming from electric dipole moments. We supplement the analytical considerations by detailed numerical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520100841
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  • 10
    Electronic Resource
    Electronic Resource
    Morphological and physiological reactions of young deciduous trees (Quercus robur L., Q. petraea [Matt.] Liebl., Fagus sylvatica L.) to waterlogging (2000)
    Springer
    Plant and soil 225 (2000), S. 227-242 
    Details
    ISSN: 1573-5036
    Keywords: hydraulic conductance ; nitrate reductase activity ; root growth ; root/leaf ratio ; stomatal conductance ; waterlogging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract One-year-old seedlings of Quercus robur L., Q. petraea (Matt.) Liebl. and Fagus sylvatica L. were cultivated in lysimeters and subjected to waterlogging for 17 weeks, interrupted by a five-week drainage period during summer. The growth of Q. robur was less affected by waterlogging than that of Q. petraea and Fagus. Waterlogging resulted in the formation of adventitious roots in Q. robur and Q. petraea, but not in Fagus. In contrast to Fagus, Q. robur and, to a lesser extent, Q. petraea were able to generate roots even below the water table. The hydraulic conductance of the excised root systems, the stomatal conductance and, in Fagus, the leaf water potential and the leaf-mass related hydraulic conductance were decreased by waterlogging. The decrease in the hydraulic conductance was largest in Fagus, and smallest in Q. robur. The roots of Fagus responded to anaerobic conditions with an increase in ethanol concentration. The measurements of nitrate reductase activities in roots and leaves provided no indications of a persistent contribution of NO3 − metabolism to the alleviation of waterlogging-induced stress. It is concluded that Q. robur and, to a lesser extent, Q. petraea can tolerate waterlogging periods better than Fagus due to a different pattern of root formation, and to a better adjustment of leaf biomass production to the hydraulic conductivity of the root system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026516027096
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