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  • 1
    ISSN: 1432-055X
    Keywords: Schlüsselwörter Autologe Transfusion ; maschinelle Autotransfusion ; Leukozyten-Depletionsfilter ; Osteosarkomzellen ; Tumorchirurgie ; Key words Autologous transfusion ; Intraoperative autotransfusion ; White blood cell depletion filter ; Osteosarcoma ; Tumor cells ; Tumor surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Intraoperative autotransfusion is contraindicated in cancer surgery because of the possible risk of systemic tumor spread. The aim of the present study was to investigate whether a cell saver in combination with a white blood cell depletion filter can remove osteosarcoma cells. Methods. A defined number of osteosarcoma cells from an established cell line were added to red cell concentrates and Ringer solution. The tumor cell concentration was 1000/ml in the first five experiments, 7111/ml in test no. 6, 1667/ml in test no. 7 and 167/ml in test no. 8. Following thorough mixing, each unit was processed separately by a cell saver (DIDECO BT 795/P) in its normal operation mode to produce a red cell concentrate. This red cell concentrate was filtered using a leukocyte depletion filter (PALL BPF 4). Samples were taken before and after processing with the autotransfuser and after filtration with the white cell depletion filter. Cytospin specimens from all samples were examined for osteosarcoma cells by three different methods (Papanicolaou stain, Vimentin antibodies, DNA analysis). Results. After processing with the autotransfuser, tumor cells were identified in the red cell concentrate. No osteosarcoma cells were evident after the combined use of cell saver and leukocyte depletion filter. Conclusion. The sole use of the autotransfuser DIDECO BT 795/P during osteosarcoma surgery is not recommended because of the potential danger of retransfusion of malignant cells. In combination with the leukocyte depletion filter PALL BPF 4, no osteosarcoma cells were identified in the red cell concentrate. Since the adhesiveness of tumor cells from established cell lines may be different from that of tumor cells in the intraoperative salvaged blood, further studies with blood from the surgical field are necessary to determine the efficacy of white cell depletion filters to eliminate osteosarcoma cells.
    Notes: Zusammenfassung Der Einsatz der Maschinellen Autotransfusion (MAT) wird in der orthopädischen Tumorchirurgie wegen der Gefahr einer systemischen Tumorzellaussaat als kontraindiziert angesehen. In dieser Studie wird untersucht, ob die MAT in Verbindung mit einem handelsüblichen Leukozyten-Depletionsfilter in der Lage ist, Osteosarkomzellen aus dem Wundblut zu eliminieren. Eine definierte Menge angezüchteter Osteosarkomzellen wird mit einem Erythrozytenkonzentrat und Ringerlösung vermischt. Dieser Versuchsansatz wird mit einem maschinellen Autotransfusionssytem aufbereitet und anschließend durch einen handelsüblichen Leukozyten-Depletionsfilter gefiltert. Standardisierte Proben werden nach der Papanicolaou-Klassifikation, immunzytochemisch (Vimentinexpression) und mit der DNA-Analyse auf Osteosarkomzellen untersucht. Nach der maschinellen Aufbereitung im Autotransfusionsgerät und der Passage des Leukozyten-Depletionsfilters konnten keine Osteosarkomzellen mehr nachgewiesen werden. Im Gegensatz hierzu wurden durch die alleinige Aufbereitung im Autotransfusionsgerät die Osteosarkomzellen nur unzureichend separiert. Obwohl mit den verwendeten Nachweisverfahren keine Tumorzellen im filtrierten Blut mehr nachgewiesen werden konnten, muß bei der Beurteilung der Eliminationsleistung des Leukozyten-Depletionsfilters berücksichtigt werden, daß diese Filter in ihrem eigentlichen Einsatzgebiet lediglich eine definierten Reduktion der Leukozyten bewirken. Darüber hinaus können Tumorzellen aus Zellkulturen ein besonderes Adhäsionsverhalten gegenüber künstlichen Oberflächen aufweisen. Weitere Untersuchungen mit Tumorzellen aus dem Wundblut sind daher notwendig, um den Stellenwert der Leukozyten-Depletionsfilter bei der Elimination von Osteosarkomzellen endgültig beurteilen zu können.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Keywords: Primary hyperparathyroidism ; Histomorphometry ; Trabecular bone structure ; Parathyroid hormone ; Bone biopsy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Iliac crest bone biopsy specimens of 391 patients with surgically proven primary hyperparathyroidism were investigated. In 60 unselected cases quantitative analysis of trabecular bone changes was performed. The age of the patients ranged between 12 and 85 years. The observed morphological findings were divided into four stages. In a few cases no differences from normal bone tissue could be observed. In 46% occurrence of a nonspecific increase of osteoid seams, osteoblasts, and osteoclasts was observed. Of the cases 50% showed a specific, but very often mild endosteal fibrosis. Only in 4% was there a severe fibroosteoclasia with development of so-called brown tumors. The quantitative analysis showed an increase of trabecular bone mass as well as of remodeling surfaces. But there was an overlap of up to 25% with the normal controls. The results demonstrate the influence of parathyroid hormone peptides on bone morphology. However, the investigation of a bone biopsy specimen is not generally very useful for diagnostic purposes.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The vacuolar aspartic proteinase from baker's yeast, saccharopepsin, has been co-crystallized with its natural inhibitor IA3, found in the cytosol. The IA3–saccharopepsin complex crystals belong to the space group P6222, with unit-cell parameters a = b = 192.1, c = 59.80 Å and one molecule per asymmetric unit. The initial X-ray analysis of the complex indicates that the crystals diffract to 5.0 Å, similar to native saccharopepsin crystals. This is probably a consequence in part of glycosylation of the native saccharopepsin. Full structural analysis of the complex crystal is in progress.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 136 (1935), S. 872-872 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SOUTH AFRICANS interested in archæology are following the work in East Africa with keen interest in the hope that it may throw light on our problems, and that discoveries there may be interpreted with a due regard to our results. Mr. T. B. O'Brien's1 views are therefore important ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 136 (1935), S. 302-303 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE Matjies River Shelter1 has yielded a very large number of skulls with hundreds of teeth. The deposit commences with a form of the Mossel Bay culture (which may be called Early Mossol Bay) which, in natural superficial strata of the neighbourhood, and in a shelter about eight ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 135 (1935), S. 620-620 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I WOULD be glad to be allowed to point out that Dr. Leakey's results in Kenya are very closely similar to those found by me on the south coast of Africa—the quartzite area—except in the matter of time. Leakey's Kanjera skulls are, as stated by Sir Arthur Keith, definitely negroid; in fact ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 309 (1991), S. 184-189 
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Protein Structure and Molecular 1122 (1992), S. 118-122 
    ISSN: 0167-4838
    Keywords: Beta-spiral ; Beta-turn ; Protein conformation ; Repetitive sequence ; Seed protein ; Supersecondary structure
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0022-2836
    Keywords: Aspartic proteinases ; Saccharomyces cerevisiae ; X-ray analysis ; crystallization ; proteinase A
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 139 (1937), S. 197-197 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I ENCLOSE photographs (Fig. 1) of two locusts with the following history: The eggs were hatched and the young reared inside, in glass, so that the only sunlight that could reach them was screened through two layers of glass; other conditions were identical with such as produced perfectly normal ...
    Type of Medium: Electronic Resource
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