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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Planta 182 (1990), S. 129-135 
    ISSN: 1432-2048
    Keywords: Arum ; Brassica (β-oxidation) ; β-Oxidation ; (enzyme location) ; Microbody ; Mitochondrion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract β-Oxidation enzymes were detected both in the mitochondria and microbodies of Arum maculatum L. spadices and Brassica napus L. seeds. It is apparent that the mitochondrial membrane barrier, which remains intact after sucrose-density-gradient centrifugation, prevents rapid access of acyl-GoA substrates to matrix βoxidation tes. Thus intact mitochondria showed little β-oxidation enzyme activity. Rupturing of the mitochondrial membrane allowed rapid access of acyl CoAs to matrix sites. Consequently, in ruptured mitochondria, high β-oxidation enzyme activities were measured.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Planta 168 (1986), S. 261-266 
    ISSN: 1432-2048
    Keywords: Carnitine palmitoyltransferase (location, function) ; Cotyledon (β-oxidation) ; Microbody ; Mitochondrion ; β-Oxidation ; Pisum (β-oxidation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two sites for β-oxidation of fatty acids in pea (Pisum sativum L.) cotyledons exist. One site is the microbody, the other the mitochondrion. Mitochondrial β-oxidation of fatty acids is carnitine-dependent. The fatty acid permeates the membrane as palmitoylcarnitine which is formed from cytosolic-side palmitoyl-CoA by a carnitine palmitoyltransferase located on the exterior face of the inner mitochondrial membrane as a peripheral protein. A single-gated pore integral membrane translocator is proposed to exchange the palmitoylcarnitine for carnitine or acetylcarnitine across the membrane. An internal (matrix side) carnitine palmitoyltransferase then reforms palmitoyl-CoA which enters β-oxidation and subsequently the tricarboxylic-acid cycle.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Planta 173 (1988), S. 263-266 
    ISSN: 1432-2048
    Keywords: Carnitine ; Carnitine palmitoyltrans-ferase ; Long-chain acylCoA synthetase ; Mitochondrion (outer membrane) ; Mitoplast ; β-Oxidation ; Palmitate ; PalmitoylCoA ; Pisum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mitochondria from pea (Pisum sativum L.) seeds were separated into two fractions, mitoplasts (intact inner membrane) and the outer-membrane fraction. The mitoplasts only oxidised palmitate in the presence of carnitine and added outermembrane fraction. Mitoplasts were able to oxidise palmitoylCoA in the presence of carnitine and added outer-membrane fraction had no effect on this oxidation. It was concluded that a long-chain acylCoA synthetase (EC 6.2.1.3) was located on the outer membrane and that the activity of this enzyme in assays was more than sufficient to account for any observed rate of O2 uptake during palmitate oxidation by pea mitochondria. The location of carnitine long-chain acyltransferase (carnitine palmitoyl transferase EC 2.3.1.21) would appear to be the mitoplast i.e. the inner mitochondrial membrane, and confirms the previous work at Newcastle.
    Type of Medium: Electronic Resource
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  • 4
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    Unknown
    In:  Other Sources
    Publication Date: 2011-08-18
    Description: The model of Lacey et al. (1981) accounting for the geometric regularity and approximate cone shape of volcanoes is discussed. It is pointed out that, contrary to the model, volcano eruptions do not occur randomly in elevation and azimuth, but are commonly restricted to summit vents and a few well defined flank zones, so that the form of a volcano is determined by its vent locations and styles of eruption. Other false predictions of the model include the constancy of lava volumes at all vent elevations, the increase in volcano radius as the square root of time, a critical height for volcano growth, the influence of planetary gravity on volcano height and the negligible influence of ash falls and flows and erosional deposition. It is noted that the model of Shteynberg and Solov'yev, in which cone shape is related to stresses due to increasing cone height, may provide a better understanding of volcano morphology.
    Keywords: GEOPHYSICS
    Type: Earth and Planetary Science Letters; 57; 2, Fe; Feb. 198
    Format: text
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  • 5
    Publication Date: 2013-08-29
    Description: Volcanism above subduction zones is a major mechanism for crustal growth and compared to some other proposed processes calculation of growth rates is relatively easy given accurate volumes and ages of volcanic material. Francis and Rundie (1976) first used this approach in a small region of the Central Andes, and extrapolated their result to the entire Central Andean arc. The derived rate of 3 to 4.2 x 10 to the minus 6th cubic km yr/km of arc length is compared with an independent estimate based upon a reconnaissance census of all major volcanoes in the Central Andes.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Workshop on the Growth of Continental Crust; p 169-171
    Format: text
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  • 6
    facet.materialart.
    Unknown
    In:  Other Sources
    Publication Date: 2011-08-18
    Description: Based on measurements and timings of 19 previous activity cycles of the Krafla caldera in Iceland that were previously reported, patterns are noted that have apparently not been described before and that appear to offer additional predictive possibilities for the time, place, and extent of near-future events at Krafla. A plot of elapsed time for each deflation event in the current Krafla rifting episode taken from Bjornsson et al. (1977, 1979) suggests that the next event should occur before the end of May, 1982. Comparison of the sites of main fissuring suggests that the next event will be close to or within the caldera, and that an eruption is to be anticipated. The trend for erupted lava area indicates that the next eruption will be larger than its predecessors.
    Keywords: GEOPHYSICS
    Type: EOS; 63; May 18
    Format: text
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  • 7
    Publication Date: 2019-06-28
    Description: Impact cratering of the earth's surface is discussed and compared with lunar craters. The basic types found on earth are either simple craters or complex impact structures and basins. Meteorite fragments and shock metamorphism provide evidence of a crater's formation by meteorite impact. Known craters on earth are ordered by location and a few principal facts are given for each crater and the general terrain in which it is located. A satellite picture of each crater and maps identifying crater locations are provided.
    Keywords: GEOPHYSICS
    Type: NASA-TM-102902 , NAS 1.15:102902 , LPI-TRN-88-03
    Format: application/pdf
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  • 8
    Publication Date: 2019-06-27
    Description: The Eastern Rift of Africa runs the gamut of crustal and lithospheric attenuation from undeformed shield through attenuated rift margin to active neo-oceanic spreading zones. It is therefore peculiarly well suited to an examination of relationships between volcano spacings and crust/lithosphere thickness. Although lithospheric thickness is not well known in Eastern Africa, it appears to have direct expression in the surface spacing of volcanoes for any given tectonic regime. This applies whether the volcanoes are essentially basaltic, silicic, or alkaline-carbonatitic. No evidence is found for control of volcano sites by a pre-existing fracture grid in the crust.
    Keywords: GEOPHYSICS
    Type: Earth and Planetary Science Letters; 33; Nov. 197
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  • 9
    facet.materialart.
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    In:  Other Sources
    Publication Date: 2019-06-27
    Description: Statistical relations between geometry, slope, and age for 26 circum-Pacific composite volcanoes (stratovolcanoes) are presented. Topics considered include morphometry, eruption characteristics, growth rates, repose periods, flow lengths, and petrological/chemical trends. Composite and cinder cones are compared, and it is suggested that, if cinder cones do evolve into composite volcanoes, a fundamental change in cone morphometry, eruption style, and petrology occurs at a basal diameter of 2 km.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 5; June 197
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  • 10
    Publication Date: 2019-07-12
    Description: It is shown that Landsat TM and MSS data provide useful and sometimes unique information on magmatic and fumarolic events at poorly monitored active volcanoes. The digital number data recorded in each spectral band by TM and MSS can be converted into spectral radiance, measured in W/sq m per micron per sr, using calibration data such as those provided by Markham and Barker (1986) and can provide temperature information on the lava fountain, lava lakes, pahoehoe flows, blocky lava, pyroclastic flow, and fumarole. The examples of Landsat data documenting otherwise unobserved precursors and/or activity include the September 1986 eruption of Lascar volcano, Chile; the continued presence of lava lakes at Erta 'Ale, Ethiopia (in the absence of any ground-based observations); and minor eruptions at Mount Erebus, Antarctica.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 7993-800
    Format: text
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