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  • Springer  (14)
  • Nature Publishing Group  (1)
  • 1985-1989  (15)
  • 1965-1969
  • 1950-1954
  • 1988  (15)
  • 1
    Electronic Resource
    Electronic Resource
    Comparison of the MSL synoptic pressure patterns of the Arctic as observed and simulated by the GISS General Circulation Model (1988)
    Springer
    Meteorology and atmospheric physics 39 (1988), S. 169-183 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary The observed daily pressure fields over the Arctic are compared with those obtained from a control run of the Goddard Institute for Space Studies (GISS) General Circulation Model using a classification typing procedure developed by Kirchhofer (1973) and a rotated principal components analysis for both data sets. The simulated patterns appear quite realistic in both frequency and geographical characteristics, although the model data show greater extremes and more closed cells. The procedure described provides a potentially useful method for evaluating the synoptic representativeness of GCM simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01030295
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal evolution of the western Svalbard margin (1988)
    Springer
    Marine geophysical researches 9 (1988), S. 165-194 
    Details
    ISSN: 1573-0581
    Keywords: transform margins ; heat flow ; ridge propagation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The northern Norwegian-Greenland Sea opened up as the Knipovich Ridge propagated from the south into the ancient continental Spitsbergen Shear Zone. Heat flow data suggest that magma was first intruded at a latitude of ≈75° N around 60 m.y.b.p. By 40–50 m.y.b.p. oceanic crust was forming at a latitude of 78° N. At ≈12 m.y.b.p. the Hovgård Transform Fault was deactivated during a northwards propagation of the Knipovich Ridge. Spreading is now in its nascent stages along the Molloy Ridge within the trough of the Spitsbergen Fracture Zone. Spreading rates are slower in the north than the south. For the Knipovich Ridge at 78° N they range from 1.5–2.3 mm yr-1 on the eastern flank to 1.9–3.1 mm yr-1 on the western flank. At a latitude of 75° N spreading rates increase to 4.3–4.9 mm yr-1. Thermal profiles reveal regions of off-axial high heat flow. They are located at ages of 14 m.y. west and 13 m.y. east of the northern Knipovich Ridge, and at 36 m.y. on the eastern flank of the southern Knipovich Ridge. These may correspond to episodes of increased magmatic activity; which may be related to times of rapid north-wards rise axis propagation. The fact that the Norwegian-Greenland Sea is almost void of magnetic anomalies may be caused by the chaotic extrusion of basalts from a spreading center trapped within the confines of an ancient continental shear zone. The oblique impact of the propagating rift with the ancient shear zone may have created an unstable state of stress in the region. If so, extension took place preferentially to the northwest, while compression occurred to the southeast between the opening, leaking shear zone and the Svalbard margin. This caused faster spreading rates to the northwest than to the southeast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369247
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  • 3
    Electronic Resource
    Electronic Resource
    The distribution of geothermal fields along the East Pacific Rise from 13°10′ N to 8°20′ N: Implications for deep seated origins (1988)
    Springer
    Marine geophysical researches 9 (1988), S. 211-236 
    Details
    ISSN: 1573-0581
    Keywords: East Pacific Rise ; heat flow ; diapirism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract In 1983 a combined SeaMARC I, Sea Beam swath mapping expedition traversed the East Pacific Rise from 13°20′ N to 9°50′ N, including most of the Clipperton Transform Fault at 10°15′ N, and a chain of seamounts at 9°50′ N which runs obliquely to both the ridge axis and transform fault trends. We collected temperature, salinity and magnetic data along the same track. These data, combined with Deep-Tow data and French hydrocasts, are used to construct a thermal section of the rise axis from 13°10′ N to 8°20′ N. Thermal data collected out to 25 km from the rise axis and along the Clipperton Transform Fault indicate that temperatures above the rise axis are uniformly warmer by 0.065°C than bottom water temperatures at equal depths off the axis. The rise axis thermal structure is punctuated by four distinct thermal fields with an average spacing of 155 km. All four of these fields are located on morphologic highs. Three fields are characterized by lenses of warmed water ≈ 20 km in length and ≈ 300 m thick. Additional clues to hydrothermal activity are provided in two cases by high concentrations of CH4, dissolved Mn and 3He in the water column and in another case by concentrations of benthic animals commonly associated with hydrothermal regions. We use three methods to estimate large-scale heat loss. Heat flow estimates range from 1250 MW to 5600 MW for one thermal field 25 km in length. Total convective heat loss for the four major fields is estimated to lie between 2100 MW and 9450 MW. If we add the amount of heat it takes to warm the rest of the rise axis (489 km in length) by 0.065.°C, then the calculated axial heat loss is from 12,275 to 38,525 MW (19–61% of the total heat theoretically emitted from crust between 0 and 1 m.y. in age).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309974
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  • 4
    Electronic Resource
    Electronic Resource
    Quantitative analyses of the early angiosperm radiation (1988)
    [s.l.] : Nature Publishing Group
    Nature 331 (1988), S. 344-346 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Most assessments of floristic and vegetational changes associated with the angiosperm radiation have been based either on palynological data4'5 or on inferences from local stratigraphic sections2. Our analysis was designed as a more comprehensive attempt to quantify the tempo of the angiosperm ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/331344a0
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  • 5
    Electronic Resource
    Electronic Resource
    Super Riemann surfaces: Uniformization and Teichmüller theory (1988)
    Springer
    Communications in mathematical physics 113 (1988), S. 601-623 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Teichmüller theory for super Riemann surfaces is rigorously developed using the supermanifold theory of Rogers. In the case of trivial topology in the soul directions, relevant for superstring applications, the following results are proven. The super Teichmüller space is a complex super-orbifold whose body is the ordinary Teichmüller space of the associated Riemann surfaces with spin structure. For genusg〉1 it has 3g-3 complex even and 2g-2 complex odd dimensions. The super modular group which reduces super Teichmüller space to super moduli space is the ordinary modular group; there are no new discrete modular transformations in the odd directions. The boundary of super Teichmüller space contains not only super Riemann surfaces with pinched bodies, but Rogers supermanifolds having nontrivial topology in the odd dimensions as well. We also prove the uniformization theorem for super Riemann surfaces and discuss their representation by discrete supergroups of Fuchsian and Schottky type and by Beltrami differentials. Finally we present partial results for the more difficult problem of classifying super Riemann surfaces of arbitrary topology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01223239
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  • 6
    Electronic Resource
    Electronic Resource
    On the compartmentalization of catalase, fatty acyl-CoA oxidase and urate oxidase in mammalian livers, and the influence of clofibrate treatment on this microlocalization (1988)
    Springer
    Molecular and cellular biochemistry 83 (1988), S. 187-194 
    Details
    ISSN: 1573-4919
    Keywords: liver catalase ; liver acyl-CoA oxidase ; liver urate oxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The compartmentalization of catalase, fatty acyl-CoA oxidase and urate oxidase was examined in the livers of mice, rats and guinea pigs, using the technique of digitonin extraction in order to avoid the trauma associated with centrifugation procedures. The results are interpreted as indicating that an appreciable proportion of catalase activity occurs in the cytoplasmic compartment of these cells. Following treatment of the animals with clofibrate, the specific activity in both peroxisomal and cytoplasmic compartments was increased, with a higher proportion of cytoplasmic catalase being evident in mice. The results for catalase were compared with those for fatty acyl-CoA oxidase and urate oxidase both of which were indicated as showing a closer association with the peroxisomal compartment than was the case for catalase. These data have been discussed in relation to their significance on present understanding of peroxisomal structure and function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226146
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  • 7
    Electronic Resource
    Electronic Resource
    Changes to the integral membrane protein composition of mouse liver peroxisomes in response to the peroxisome proliferators clofibrate, Wy-14,643 and Di(2-ethyl-hexyl)phthalate (1988)
    Springer
    Molecular and cellular biochemistry 81 (1988), S. 29-36 
    Details
    ISSN: 1573-4919
    Keywords: catalase ; membrane proteins ; peroxisome proliferators ; peroxisomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Peroxisomes were purified from livers of control mice and from mice treated with three agents which induce proliferation of hepatic peroxisomes — namely two structurally unrelated hypolipidemic drugs, clofibrate (ethyl-α-p-chlorophenoxyisobutyrate) and Wy-14,643 (4-chloro-6[2,3-xylidino)-2-pyrimidinylthio] acetic acid), and a plasticizer, DEHP (di-(2-ethylhexyl)phthalate). Membranes were isolated from these purified peroxisomes and analysed by SDS-polyacrylamide gel electrophoresis. All membranes which were tested, displayed two predominant integral membrane proteins of apparent molecular weights of 68 kDa and 70 kDa respectively, as well as a number of minor components. Treatment of animals with clofibrate, Wy-14,643 and DEHP was observed to result in each case in an increased proportion of the 70 kDa protein in the peroxisomal membranes. These treatments also resulted in increased peroxisomal fatty acid oxidation in livers and an increase in the proportion of catalase activity in the cytosolic fraction of liver cells. These results have been discussed in relation to alterations in the molecular composition of the membranes, the mechanisms of peroxisome proliferation and the inducibility of peroxisomal membrane proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225650
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  • 8
    Electronic Resource
    Electronic Resource
    Transformation with SV40 virus prevents retinoic acid inhibition of plasma membrane NADH diferric transferrin reductase in rat liver cells (1988)
    Springer
    Journal of bioenergetics and biomembranes 20 (1988), S. 383-391 
    Details
    ISSN: 1573-6881
    Keywords: Transplasma membrane electron transport ; plasma membranes ; retinoic acid ; cell differentiation ; SV40 transformation ; adriamycin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract Retinoic acid inhibits the reduction of diferric transferrin through the transplasma membrane electron transport system on fetal rat liver cells infected with a temperature-sensitive SV40 virus when the cells are in the nontransformed state cultured at 40°C. When the cells are in the transformed state (grown at the permissive 33°C temperature), retinoic acid does not inhibit the diferric transferrin reduction. Inhibition of activity of nontransformed cells is specific for retinoic acid with only slight inhibition by retinol and retinyl acetate at higher concentrations. Isolated rat liver plasma membrane NADH diferric transferrin reductase is also inhibited by retinoic acid. The effect of transformation with SV40 virus to decrease susceptibility to retinoic acid inhibition stands in contrast to much greater adriamycin inhibition of diferric transferrin reduction in the transformed cells than in nontransformed cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769639
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  • 9
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    Super Riemann surfaces: Uniformization and Teichm�ller theory (1988)
    Springer
    Details
    Publication Date: 1988-12-01
    Print ISSN: 0010-3616
    Electronic ISSN: 1432-0916
    Topics: Mathematics , Physics
    Published by Springer
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  • 10
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    On the compartmentalization of catalase, fatty acyl-CoA oxidase and urate oxidase in mammalian livers, and the influence of clofibrate treatment on this microlocalization (1988)
    Springer
    Details
    Publication Date: 1988-10-01
    Print ISSN: 0300-8177
    Electronic ISSN: 1573-4919
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Published by Springer
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