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  • Organic Chemistry  (26)
  • ASTROPHYSICS  (23)
  • Cell & Developmental Biology
  • Life and Medical Sciences
  • 1990-1994  (39)
  • 1970-1974  (12)
  • 1950-1954  (11)
  • 1935-1939  (4)
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Year
  • 1
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    Cathodoluminescence observations of in situ aqueous destruction of chondrules in the Murchison CM chondrite (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: A low-power cathodoluminescence (CL) mosaic of a 1x2 cm section of the Murchison CM chondrite contains chondrules of two types: one contains olivines with red CL and is thought to be the equivalent of group A chondrules of Sears et.; and one without observable CL, which is probably equivalent to their group B chondrules. Both types of chondrule contain dust mantles with a characteristic uniform red CL due to very fine-grained forsterites, but the mantles of group A chondrules have a complex internal structure and are much thicker than the relatively thin rims on the group B chondrules. The variety of internal textures and the progressive integration of the objects with the surrounding matrix suggests to us that these features are large group A chondrules in the process of being destroyed by aqueous alteration. Prior to aqueous alteration, group A chondrules in CM chondrites were larger than group B chondrules, which is contrary to the situation in ordinary chondrites and were apparently destroyed more rapidly than group B chondrules by aqueous alteration.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z; p 1269-1270
    Format: text
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  • 2
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    The group A3 chondrules of Krymka: Further evidence for major evaporative loss during the formation of chondrules (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Like Semarkona (type 3.0), Krymka (type 3.1) contains two distinct types of chondrule (namely groups A and B) which differ in their bulk compositions, phase compositions, and CL properties. The group A chondrules in both meteorites show evidence for major loss of material by evaporation(i.e. elemental abundance patterns, size, redox state, olivine-pyroxene abundances). Group A and B chondrules probably formed from common or very similar precursors by the same processes acting with different intensities, group A suffering greater mass-loss by evaporation and reduction of FeO and SiO2. While Krymka chondrules share many primary mineralogical and compositional properties with Semarkona chondrules, the minimal metamorphism it has suffered has also had a significant effect on its chondrules.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M; p 681-682
    Format: application/pdf
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  • 3
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    Meteorites from recent amor-type orbits (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: We report here the discovery of a recent meteorite shower in Antarctica, the members of which have very high natural thermoluminescence levels. It is apparent from these data that the shower has been on Earth only a short time (approximately 1000 years) and the meteorite probably came to Earth through rapid (less than 10 exp 5 years) evolution from an orbit with perihelion greater than 1.1 AU, similar to Amor asteroids. Only a very small number of meteorites, including a few modern falls, appear to have had similar orbital histories.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F; p 93-94
    Format: text
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  • 4
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    The great 8 MA event and the structure of the H-chondrite parent body (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The H-chondrites have been the subject of several recent controversies, including the question of whether Antarctic and non-Antarctic meteorites are or are not the same and whether there or is not evidence for stratigraphic layering in the original parent body. We have identified two distinct groups of H5 chondrites in the Antarctic collection. One group has induced thermoluminescence (TL) peak temperatures less than 190 C and metallographic cooling rates between S to 50 K/Myr, similar to modern falls. It also has a variety of cosmic ray exposure ages, many being greater than 107 years. The other group has TL peak temperatures greater than 190 C, metallographic cooling rates of 100 K/Myr and cosmic ray exposure ages of 8 Ma. The members of this group were generals smaller than those of the greater than 190 C group (including the mode falls) during cosmic ray exposure. Detailed study of the cosmogenic nuclide concentrations of these groups indicates that they are not solely the result of pairing of a few unusual meteorites. It is likely that the greater than 190 C group was an important part of the H-chondrite flux about 1 million years ago, but has since decreased in importance relative to the less than 190 C group. In a previous work, we discussed several possible origins for the greater than 190 C group, including multiple H-chondrite parent bodies, unusual parent body structure, and creation during the 8 Ma event. In this paper, we present new data for H4 chondrites in light of these ideas.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F; p 91-92
    Format: text
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  • 5
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    Open-system behavior during chondrule formation (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The question of whether chondrules behaved as open systems during formation is crucial to our understanding of both chondrule and chondrite formation. The very large range of chondrule types is best summarized by the compositional classification scheme, wherein the primitive chondrule groups (i.e., those not produced by metamorphic processes) are A1, A2, A5, and B1. In the Semarkona (LL3.0) chondrite, 10.5%, 25.0%, 5.0%, and 56.9% (by number) of the chondrules are groups A1, A2, A5, and B1, respectively. We argue that groups A1 and A2 were produced by reduction and evaporation during chondrule formation of material originally resembling group B1 chondrules.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Papers Presented to the Conference on Chondrules and the Protoplanetary Disk; p 37-38
    Format: text
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  • 6
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    Lewis Cliff 87057: A new metal-rich E3 chondrite with similarities to Mt. Egerton, Shallowater and Happy Canyon (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Antarctic meteorites LEW87057, LEW87220, LEW87223, LEW87234, LEW87237, and LEW87285 were described as paired E3 chondrites by Brian Mason (Antarctic Meteorite Newsletters, 12(1) and 15(1,2)). LEW87223 is texturally unusual, containing abundant chondrules and jagged troilite grains which are enclosed in metal. Our INAA data show that the siderophile element abundance in two splits of LEW87223 are higher than the EH range, while chalcophile elements (Cr excepted) are highly depleted. Mineral compositions are unlike those normally found in EH or EL chondrites or aubites, and in some respects resemble those of several anomalous enstatite meteorites such as Shallowater, Mt. Egerton, and Happy Canyon. The bulk and mineral compositions are consistent with the addition of EL chondrite metal to an EL3 chondrite with the removal of sulfides other than troilite which is now Cr-rich. We suggest that this meteorite is an EL3 chondrite into which metal was introduced and sulfides redistributed during an event involving impact melting and brecciation.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z; p 1571-1572
    Format: text
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  • 7
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    A new class of solutions for interstellar magnetohydrodynamic shock waves (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An analysis is presented of the equations of motion for steady MHD shock waves proopagating in interstellar clouds, for boundary conditions that preclude C shocks. In addition to J shocks, in which the neutral fluid component becomes subsonic at an adiabatic jump front, the equations admit a new class of solutions, called C-asterisk shocks, in which the transition to subsonic flow occurs continuously at a sonic point. Numerical methods are developed for computing the structure of J and C-asterisk shocks propagating in diffuse interstellar clouds. The effects of chemical, ionization, and recombination processes are included in this treatment. An alternative numerical method, which uses artificial viscosity to facilitate integration through sonic points, is analyzed and shown to be invalid. A set of exemplary solutions, computed for realistic shock parameters, shows that C-asterisk shocks occur for a broad range of conditions relevant to diffuse interstellar clouds.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 350; 700-721
    Format: text
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  • 8
    Electronic Resource
    Electronic Resource
    Azofarbstoffe und Immunbiologie. Aufhebung anaphylaktischer Azoprotein-Überempfindlichkeit durch p-Phenyl-arsinsäure-azofarbstoffe (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1059-1077 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Azoprotein (sowohl in vitro hergestelltes als in vivo entstehendes) enthält entsprechend der Annahme von Pauly die Azo-gruppierung —N=N—.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001152
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  • 9
    Electronic Resource
    Electronic Resource
    Antihistaminica I. Basische Phenoläther-Derivate (1950)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 33 (1950), S. 516-522 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Synthese von 2-[o-(β-Dimethylamino-alkoxy)-benzyl]-thiophenen und 2-[o-(β-Dimethylamino-alkoxy)-benzyl]-pyridinen und ihre Antihistaminwirkung beschrieben.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19500330312
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  • 10
    Electronic Resource
    Electronic Resource
    The hemorrhagic and hemopoietic nodules in the alar and interfemoral membranes of pizonyx vivesi (chiroptera)Financial support for publication was provided by funds derived from income on the endowment of the Horace H. Rackham School of Graduate Studies, University of Michigan. (1954)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 94 (1954), S. 439-471 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1050940302
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