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  • 1995-1999  (112)
  • 1
    Electronic Resource
    Electronic Resource
    Three-dimensional Mapping of Magma Source and Transport Regions from Seismic Data: The Mantle Wedge beneath Northeastern Japan (1998)
    Springer
    Pure and applied geophysics 153 (1998), S. 377-398 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Magma distribution, three dimensions, velocity structure, seismic Q, mantle wedge, northeastern Japan.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —We investigate the distribution of partial melt in island arc using the seismic velocity structure of the mantle wedge beneath northeastern Japan. The comparison of the seismic tomography with laboratory velocity data on a partially-molten mantle rock yields estimates of melting zones in three dimensions. We employ experimental data on the degree of partial melt in hydrous peridotite to give constraints on the melt fraction and temperature. Melting and magma-rich zones derived from the velocity structure coincide with observed low Q zones. The results of the three-dimensional mapping indicate that the source of magma in island arc is diapir-like melting patches localized within the low velocity zones of the mantle wedge. Extensive volcanic activity along the volcanic front is due to the presence of vast magma-rich zones just beneath the Moho. Those melting zones in the uppermost mantle may, in turn, cause melting of lower crustal materials and produce felsic magma. Melt appears to stay at and beneath the Moho, where crystallization fractionation may proceed. Melt exists at greater depths in the back-arc region, which may correlate with across-arc variations of chemical compositions of the volcanic rocks observed in northeastern Japan. We suggest that magma migration in the ductile lower crust may cause low-frequency microearthquakes, and magma penetration into the brittle upper crust may produce mid-crustal S-wave reflectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050200
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  • 2
    Electronic Resource
    Electronic Resource
    Respiratory pigments of Yoldia eightsi, an Antarctic bivalve (1998)
    Springer
    Marine biology 131 (1998), S. 15-23 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Yoldia eightsi, an infaunal protobranch bivalve inhabiting the soft sediments of the Antarctic Sea, contains hemocyanin in its hemolymph and an intracellular hemoglobin in its gills. The concentration of hemocyanin in the hemolymph of Y. eightsi is very low, but the presence of this protein was documented by transmission electron microscopy after negative staining. The structure of Y. eightsi hemocyanin appears to be remarkably similar to that found in Gastropoda. The intracellular gill hemoglobin can be recovered after osmotic shock of the tissue and is isolated as a monomeric form, the molecular weight of which is 15.7 ± 0.4 kDa, as detected by FPLC gel-filtration experiments and SDS-PAGE. Isoelectric focusing experiments suggest the presence of a single native component with pI 6.6. Aggregation products accumulate during exposure to air and are resistant to SDS and β-mercaptoethanol treatment. This process can be avoided by maintaining the sample under a CO atmosphere. The oxygen dissociation curves, determined at pH 7.0 and 7 °C, are slightly sigmoidal, giving a Hill constant value of 1.35, probably related to the formation of aggregation products. The affinity for oxygen is moderately high, half saturation occurring at 3.15 mmHg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050291
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  • 3
    Electronic Resource
    Electronic Resource
    Physical and gene organization of mitochondrial DNA from the fertile cytoplasm of sugarbeet (Beta vulgaris L.) (1995)
    Springer
    Current genetics 28 (1995), S. 235-241 
    Details
    ISSN: 1432-0983
    Keywords: Mitochondrial genome ; Physical map ; Repeated sequences ; Sugarbeet
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have constructed a complete physical map of the mitochondrial genome from the male-fertile cytoplasm of sugarbeet. The entire sequence complexity can be represented on a single circular master chromosome of 358 kb. This master chromosome contains three copies of one recombinationally active repeat sequence, with two copies in direct orientation and the other in inverted orientation. The positions of the rRNA genes and of 23 polypeptide genes, determined by filter hybridization, are scattered throughout the genome, with triplicate rrn26 genes located partially or entirely within the recombination-repeat elements. Three ribosomal-protein genes (rps1A, rps14 and rps19) were found to be absent from sugarbeet mtDNA. Our results also reveal that at least six regions homologous with cpDNA are dispersed in the mitochondrial genome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309782
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  • 4
    Electronic Resource
    Electronic Resource
    Inhibitory effect of lipopolysaccharide on apoptotic cell death in macrophages infected with Actinobacillus actinomycetemcomitans (1999)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 175 (1999), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We have reported that the macrophage-like cell line J774.1, when infected with the periodontopathic bacterium Actinobacillus actinomycetemcomitans, undergoes apoptosis. In this study, we examined whether stimulation of J774.1 cells with lipopolysaccharide (LPS) before the infection affects the subsequent apoptosis. Cytotoxicity on the LPS-stimulated cells was about half of the unstimulated control cells. DNA fragmentation in the LPS-stimulated cells was also significantly lower than in the control cells, whereas it was increased to a level similar to that of the control cells by addition of a nitric oxide (NO) inhibitor. In addition, significantly smaller numbers of live A. actinomycetemcomitans were recovered from the LPS-stimulated macrophages at 8 h after the infection as compared with the control cells. These findings suggest that the inhibitory effect of LPS on apoptosis results from an enhanced NO-mediated bactericidal activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1999.tb13622.x
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  • 5
    Electronic Resource
    Electronic Resource
    Possible involvement of protein kinase C in apoptotic cell death of macrophages infected with Actinobacillus actinomycetemcomitans (1998)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 159 (1998), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We have previously reported the evidence for apoptosis in the mouse macrophage cell line J774.1 by the periodontopathic bacterium Actinobacillus actinomycetemcomitans. In this study, we examined the role of protein kinases in the induction of apoptosis in A. actinomycetemcomitans-infected J774.1 cells by the MTT assay, fluorescence microscopy and flow cytometric analysis. After J774.1 cells were precultured with protein kinase C (PKC) activator, phorbol 12-myristate 13-acetate (PMA), J774.1 cells infected with A. actinomycetemcomitans showed the increased percentage of apoptotic cells. On the contrary, protein kinase A (PKA) activators, such as forskolin and dibutyryl cAMP, do not mimic the effect of PMA. PKC inhibitors, such as staurosporine, calphostin C, chelerythrine chloride, and H7 were found to suppress apoptotic cell death in J774.1 cells infected with A. actinomycetemcomitans. However, HA1004, known as PKA inhibitor, had no effect on apoptosis in infected macrophages. The results presented here suggest that the signals through PKC may play crucial roles in the modulation of apoptosis in macrophages infected with A. actinomycetemcomitans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1998.tb12868.x
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of magnetic interaction in barium hexaferrite particles : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3812-3814 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of interactions on the magnetic relaxation of nanocrystalline hexagonal barium hexaferrite BaFe10.4Co0.8Ti0.8O19 is discussed. We had previously shown that according to the T ln(t/τ0) scaling, an enhancement of the lowest-energy barriers was detected when demagnetizing interactions were dominant. Also, the Henkel plots obtained for particles of about 10 nm of mean diameter showed that the overall interactions were demagnetizing. In the present work, we have modified the interactions by milling the particles with a nanosized SiO2 powder. Dipolar interactions are modified by breaking the particle aggregates. The observed overall interactions resulted to be also demagnetizing for the milled sample. The time dependence of the magnetization was analyzed according to two different procedures: the fluctuation field and activation volume analysis and the T ln(t/τ0) scaling. Activation volumes were found to increase with demagnetizing interactions and the leading demagnetizing mechanism appeared to shift from an individual particle mode for the unmilled sample to a collective one for the milled sample. The second approach showed larger relaxation rates at short times for the milled sample. The effective energy barrier distribution obtained from the scaling suggested that demagnetizing interactions increased in the milled sample, which led to an enhancement of the amount of the lowest-energy barriers. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364778
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  • 7
    Electronic Resource
    Electronic Resource
    T⋅ln(t/τ0) scaling approach and fluctuation field analysis in interacting particulate systems (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7427-7431 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The time dependence of the magnetization in samples having a different degree of interparticle interactions is analyzed. The selected compound was a nanocrystalline powder of the composition BaFe10.4Co0.8Ti0.8O19 with and without an admixture of nanosized SiO2 particles. Two different approaches were considered for the analysis of the thermally activated demagnetization: the T⋅ln(t/τ0) scaling of the thermomagnetic relaxation in zero applied field, and the classical fluctuation field and activation volume analysis. The energy barrier distribution obtained from the former approach shows that the occurrence of larger demagnetizing interactions leads to a relative enhancement of the lowest energy barriers with respect to the largest barriers. Activation volumes are found to increase with demagnetizing interactions and the leading demagnetizing mechanism appears to shift from an individual particle mode (coherent or nucleation) to a collective one. Both analyses are suggested to be taken into account in order to ascertain the influence of interactions on the magnetic properties of nanocrystalline particles.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365442
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  • 8
    Electronic Resource
    Electronic Resource
    The Influence of Unemployment Benefits on Unemployment Duration: Evidence from Spain (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Labour 10 (1996), S. 0 
    Details
    ISSN: 1467-9914
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: : This paper analyses the duration of unemployment spells and the possible incidence of unemployment insurance on job search behaviour and voluntary duration of unemployment in Spain. To do so, a longitudinal data set containing information on unemployment recipients during the period 1987-93 is used. Hazard rates and survival profiles are constructed for the cohorts of unemployed workers entering the benefit system at different points in time, and a logit model of the probability of leaving the system before exhausting entitlement period is presented. The results do not support the view that the unemployed tend to intensify their job search when benefits are near exhaustion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-9914.1996.tb00084.x
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  • 9
    Electronic Resource
    Electronic Resource
    Twin helical undulator beamline for soft X-ray spectroscopy at SPring-8 (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 542-544 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A very high resolution soft X-ray beamline, BL25SU, has been designed and is under construction at SPring-8. Completely right or left circularly polarized light is supplied on a common axis of a newly designed twin helical undulator. A helicity modulation up to 10 Hz can be performed using five kicker magnets. The fundamental radiation covers the region 0.5–3 keV. Higher-order radiation is rather weak on the axis. A monochromator with varied-line-spacing plane gratings is installed to cover the region below 1.5 keV. A very high resolution beyond 104 is expected for the whole energy region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S090904959701902X
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  • 10
    Electronic Resource
    Electronic Resource
    Diazidobis(2,2'-bipyridine)nickel(II) Monohydrate (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 62-65 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270194005159
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