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Digitale Medien

Chordoid sarcoma (extraskeletal myxoid chondrosarcoma) (1982)

Dardick, Irving ; Lgacé, Réal ; Carlier, Maureen T. ; [weitere]

Springer

Virchows Archiv 399 (1982), S. 61-78

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Details

ISSN: 1432-2307

Schlagwort(e): Chordoid sarcoma ; Chondrosarcoma ; Electron microscopy

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary Evaluation of a series of 12 chordoid sarcomas suggests that there is a wider range of histological features in this entity then previously appreciated. Six of the lesions had a typical tumor cell organization and a mixture of cellular and myxoid stromal components, while the remaining cases were atypical because of a more solid growth pattern. Four of the 12 cases, that included both typically myxoid and more cellular examples, had small foci with hyalinized stroma segragating individual or small groups of tumor cells with and without lacunar spaces. Two atypical cases revealed more extensive and obvious chondrocytic differentiation in recurrent or metastatic lesions and in one of these, the histological pattern was that of mesenchymal chondrosarcoma. Ultrastructural examination of three cases revealed fine structural features of both the tumor cell population and extracellular matrix compatible with chondrocytic differentiation. Results of light and electron microscopy of this series of chordoid sarcoma add further support for categorizing this tumor with other malignant chondrocytic neoplasms. It is probable that chordoid sarcoma and extraskeletal myxoid chondrosarcoma represent the same entity and that this lesion has a close histogenetic relationship to mesenchymal chondrosarcoma.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00666219

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Digitale Medien

Importance of quality control in a gas chromatographic method to characterize crude oilsMany of the details in this paper were presented as a poster at the Tenth International Symposium on Capillary Chromatography, Riva del Garda, Italy, May 22-25, 1989. (1994)

Yancey, Joel A. ; Kosman, Joseph J. ; Grills, John J. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 17 (1994), S. 463-468

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Details

ISSN: 0935-6304

Schlagwort(e): Capillary GC ; Petroleum crude oil ; Condensates ; Carbon number distribution ; Pseudocomponents ; Quality control ; Quality assurance ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A quality control scheme has been developed to achieve reproducible capillary GC characterization of crude oils and petroleum condensates. The method uses an internal standard to quantify the amount of non-eluted material in the crude oil sample. Correlation between the gas chromatographic results and actual distillation was 2 %. After repeated use, however, weekly analysis of the same standard crude oil did not give the correct composition. This was a result of discrimination, which worsened with time, as a result of leaks in the septum or the graphite ferrules. More reproducible results were obtained by performing frequent analyses of quality control samples to ensure that the gas chromatographic system was operating properly. The use of quality control charts was a convenient way of ensuring correct operation and identifying the need for corrective action on the gas chromatographic system.

Zusätzliches Material: 2 Ill.