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  • 1
    Electronic Resource
    Electronic Resource
    COMPETITIVE INHIBITION OF ENZYMATIC REACTIONS BY OXAMYCIN (1960)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 82 (1960), S. 998-999 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01489a058
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  • 2
    Electronic Resource
    Electronic Resource
    Electrical conductivity of silicate perovskite at lower-mantle conditions (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 395 (1998), S. 493-495 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Geophysical models of the electrical conductivity of the Earth's mantle based on the observed variations of electric and magnetic fields at the surface of the Earth yield estimates of about 1 S m−1 for the conductivity of the uppermost lower mantle,. But ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/26736
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  • 3
    Electronic Resource
    Electronic Resource
    Composition of the Cell Wall of Staphylococcus aureus 209 P (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 959-960 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We found2 that similar uridine-diphosphate compounds were accumulated in another strain of S. aureus treated with penicillin, but these compounds contained five amino-acids : alanine, glycine, lysine, aspartic and glutamic acid in various combinations. As it seems probable that there is a certain ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/182959b0
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  • 4
    Electronic Resource
    Electronic Resource
    Uridine Diphosphate Amino-sugar Compounds from Staphylococcus aureus inhibited by Penicillin (1958)
    [s.l.] : Nature Publishing Group
    Nature 181 (1958), S. 906-907 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have found a variety of similar uridine diphos-phate amino-sugar compounds, some of which contained aspartic acid and glycine. Cells of S. aureus strain 209 P treated with penicillin were extracted with trichloracetic acid. After removal of trichloracetic acid, barium hydroxide and sufficient ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/181906b0
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  • 5
    Electronic Resource
    Electronic Resource
    Aseismicity in the lower mantle by superplasticity of the descending slab (1991)
    [s.l.] : Nature Publishing Group
    Nature 351 (1991), S. 140-141 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recent tomographic inversions of seismic data have indicated high-velocity anomalies that may correspond to a subducted slab penetrating into the lower mantle10'11. One objection to this idea of slab penetration is the widely observed lack of seismic activity below -700 km depth. O'Connell9 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/351140a0
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  • 6
    Electronic Resource
    Electronic Resource
    Melting of peridotite at uppermost lower-mantle conditions (1987)
    [s.l.] : Nature Publishing Group
    Nature 328 (1987), S. 514-517 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Melting and sub-solidus phase relations of peridotite PHN-1611 up to 25 GPa. Experimental results below 13 GPa are given in ref. 20; only data points above 15 GPa are plotted. Solid symbols, sub-solidus runs; half-solid symbols, partial melting; open symbols, hyperliquidus runs. Dominant ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/328514a0
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  • 7
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of MgSiO3 ilmenite from vibrational spectra (1992)
    Springer
    Physics and chemistry of minerals 18 (1992), S. 423-432 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Unpolarized infrared (IR) reflectance spectra for MgSiO3 ilmenite taken from a single-crystal and from a densly packed polycrystalline sample possessed all eight peaks mandated by symmetry between 337 and 850 cm−1. Polarizations were inferred from intensity differences between the two samples. IR peak positions differ by up to 250 cm−1 from recent calculations, but on average are within 11%. Heat capacity C p calculated from these data by using a Kieffer-type model are within the experimental uncertainty of calorimetric measurements from 170 to 700 K. Outside this range, calculated C p is probably accurate within a few percent, based on recent results for garnets. Calculated entropy is only slightly less accurate, giving S 0 (298.15 K) as 54.1 ±0.5 J/ mol-K, which is 10% lower than recent estimates based on phase equilibria. The slope of the phase boundary between ilmenite and perovskite is used to predict S 0 (298.15 K) of perovskite as 58.7 ±1.4 J/mol-K, which is 10% lower than previous values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00200965
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  • 8
    Electronic Resource
    Electronic Resource
    High-pressure transformations in silicates, germanates, and titanates with ABO3 stoichiometry (1979)
    Springer
    Physics and chemistry of minerals 4 (1979), S. 265-273 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract High-pressure phase transformations were investigated for two silicates, MgSiO3 and ZnSiO3; six germanates, MGeO3 and six titanates, MTiO3 (M=Ni, Mg, Co, Zn, Fe, and Mn) at about 1,000°C and pressures up to ca. 30 GPa. CoGeO3 was found to assume the ilmenite form. The ilmenite phases were confirmed to transform in the following schemes: to perovskite in MgSiO3 and MnGeO3, to corundum in MgGeO3 and ZnGeO3, to rocksalt plus rutile in ZnSiO3 and CoGeO3 and to rocksalt plus TiO2 (possibly of some denser structure) in NiTiO3, MgTiO3, CoTiO3, ZnTiO3 and FeTiO3. In the case of FeTiO3, the corundum form appeared as an intermediate phase. The possibility that the corundum type MnTiO3 might transform to some denser modification could not be excluded. The compound NiGeO3 was nonexistent throughout the pressure range studied. High-pressure phases of ABO3 (A=Ni, Mg, Co, Zn, Fe, and Mn; B=Si, Ge and Ti) are summarized, and those stabilized at pressures higher than 20 GPa are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307950
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  • 9
    Electronic Resource
    Electronic Resource
    Hydrostatic compression of ilmenite phase of ZnSiO3 and MgGeO3 (1977)
    Springer
    Physics and chemistry of minerals 2 (1977), S. 171-176 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Accurate measurements of cell parameters were performed on the ilmenite phases of ZnSiO3 and MgGeO3 using an X-ray diffraction method under hydrostatic conditions. The linear changes in cell parameter are represented by 1−a/a 0=(1.06±0.04)×10−4 P(kbar) and 1−c/c 0=(2.11±0.04)×10−4 P for ZnSiO3, and 1−a/a 0=(1.37±0.03)×10−4 P and 1−c/c 0=(2.05±0.04)×10−4 P for MgGeO3. A least-squares calculation using the first-order Birch-Murnaghan equation gives K T =2.16±0.02 Mbar and K T =1.87±0.02 Mbar for ZnSiO3 and MgGeO3, respectively. Elastic systematics assuming K T V m =constant give a predicted value K T =2.14 Mbar for the ilmenite phase of MgSiO3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307530
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  • 10
    Electronic Resource
    Electronic Resource
    Transition enthalpies and entropies of high pressure zinc metasilicates and zinc metagermanates (1989)
    Springer
    Physics and chemistry of minerals 16 (1989), S. 799-808 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The enthalpies of transition at T= 298 K between zinc metasilicate assemblages, measured by molten oxide solution calorimetry, are: $$\begin{gathered} {1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2} Zn_2 SiO_4 (phen) + {1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2} SiO_2 (qz) \to ZnSiO_3 (cpx) \hfill \\ \Delta H = 10.4 \pm 2.4 kJ/mol \hfill \\ \end{gathered} $$ (1) 2 $$\begin{gathered} {\text{ZnSiO}}_{\text{3}} {\text{(cpx)}} \to {\text{ZnSiO}}_{\text{3}} {\text{(ilm)}} \hfill \\ \Delta H = {\text{52}}{\text{.4}} \pm {\text{2}}{\text{.7kJ/mol}} \hfill \\ \end{gathered}$$ (2) For reaction (1), the measured enthalpy is lower than the value 15.7±2.0 kJ/mol from the phase boundary of Syono et al. The P-T slope derived from the calorimetric data has a somewhat greater value than that of the line chosen by Syono et al., but is still consistent with the individual data points in that study. For reaction (2), the measured enthalpy of transformation is in close agreement with the value 54.0±5.1 kJ/mol estimated from the phase boundary of Akimoto et al, and with the value 50.9±3.2 kJ/mol from the phase boundary of Ohtani, which is parallel to and 0.6 GPa lower than Akimoto's. All estimates assume a pressure-independent volume of transition. For the zinc metagermanate composition, measured heats of transformation are: 3 $$\begin{gathered} {\text{1/2 Zn}}_{\text{2}} {\text{GeO}}_{\text{4}} {\text{(phen) + 1/2 GeO}}_{\text{2}} {\text{(qz)}} \hfill \\ \to {\text{1/2 Zn}}_{\text{2}} {\text{GeO}}_{\text{4}} {\text{(dist sp) + 1/2 GeO}}_{\text{2}} {\text{(rutile)}} \hfill \\ \Delta H = - {\text{17}}{\text{.7}} \pm {\text{3}}{\text{.8 kJ/mol}} \hfill \\ \end{gathered}$$ (3) 4 $$\begin{gathered} {\text{1/2 Zn}}_{\text{2}} {\text{GeO}}_{\text{4}} {\text{(dist sp) + 1/2 GeO}}_{\text{2}} {\text{(rutile)}} \to {\text{ZnGeO}}_{\text{3}} {\text{(lim)}} \hfill \\ \Delta H = {\text{14}}{\text{.3}} \pm {\text{5}}{\text{.9 kJ/mol}} \hfill \\ \end{gathered}$$ (4) Raman and infrared spectra of ZnSiO3 clinopyroxene and ilmenite are presented. The entropy change for the clinopyroxene → ilmenite transiton is calculated from the spectra and estimates for the directionally-averaged acoustic velocities, using the Kieffer model for the vibrational density of states. The value ΔS = −12±5 J/mol·K, calculated using a variety of plausible densities of states, agrees with the value from phase equilibria, ΔS = −12.7±6.0 J/mol·K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209704
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