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  • 1985-1989  (4)
  • 1986  (4)
  • 1
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Raman microprobe (RMP) spectra were produced for each of the olivine and spinel structured phases of Mg2GeO4 and (Mg, Fe)2SiO4. The assembled data show that bands due to the tetrahedra in silicate and germanate olivines shift in a way that indicates a dominant mass effect. This correspondence is difficult to make in spinels due to differences in structural type. Differences in Fe/Mg content of olivine shift the tetrahedral vibration bands only slightly, but their linear shifts could be used to indicate the composition of the phase.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Olivine in the DAC, transformed into perovskite and magnesiowiistite in the three vertical strips that have been laser-heated. The starting material powder was placed in the 300-jjtm-diameter hole of a hardened nickel gasket, 200 |xm thick, and pressurized in the DAC to a maximum pressure ...
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0533
    Keywords: Monstrocellular brain tumor ; Malignant glioma ; Foamy cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A man of 32 years was admitted with a 3-month history of temporal lobe epilepsy. CT-Scan showed a well-circumscribed area of heterogenous contrast enhancement in the right temporal lobe. Gross total resection was performed but the tumor recurred: the patient died 6 months after the onset of symptoms. There was no autopsy. Histology revealed a highly pleomorphic neoplasm with extensive zones of necrosis. Monster cells, up to several hundred micrometers in diameter, with multiple and/or multilobed nuclei were numerous and showed emperipolesis for polymorphonuclear, mononuclear, and small tumor cells. Abundant mitoses were observed. Tumor cells of all sizes had ground-glass or vacuolated cytoplasm which obscured their glial nature. GFAP was demonstrated in some neoplastic cells. Reticulin fibers were confined to perivascular areas where mononuclear inflammatory cells were sometimes noted. Vascular proliferation was mild. Electronmicroscopic study revealed that the cytoplasms of the tumor cells contained abundant lipid droplets, numerous mitochondria, and glio-filaments. Such a tumor has been reported recently as “malignant glioma with heavily lipidized tumor cells”. This rare entity, previously reported as xanthosarcoma of the brain, represents a subgroup of primitive monstrocellular cerebral tumors.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0533
    Keywords: Saccular microaneurysm ; Cerebral (pontine) lacunae ; Thrombosis ; Microhemorrhages
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors present the case of a hypertensive patient with a thrombosis of a saccular microaneurysm (SMA) and underlying cerebral (pontine) lacunae. This SMA lay at the junction between the main vessel and two small feeding arteries penetrating into the necrotic territory. Microhemorrhages were observed in and outside the aneurysmal wall. Very sinuous narrow channels of recanalization crossed the thrombosis between the upstream and downstream vessels. The anatomical relationship between the SMA and the lacunae has been histologically demonstrated.
    Type of Medium: Electronic Resource
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