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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 175 (1979), S. 239-245 
    ISSN: 1433-8580
    Keywords: Erythrocyte ghosts ; Erythrocyte volume ; Enzymes immobilized ; Enzyme replacement therapy ; Erythrozytenschatten (ghosts) ; Erythrozytenvolumen ; Zellulare Trägersysteme ; Immobilisierte Enzyme ; Enzymersatz-Therapie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Reversibel verschlossene Erythrozytenschatten (ghosts) sind als in-vivo-Trägersysteme für die Enzymsubstitution bei angeborenen Stoffwechselleiden vorgeschlagen worden. Ein Vergleich von Methoden zur reversiblen hypotonen Hämolyse zeigte, daß die fünffache Menge an Serumalbumin eingeschlossen werden konnte, wenn eine Dialysemethode anstelle der direkten Hämolyse angewandt wurde. Hämatokrit, Mischtechnik und Dauer der hypotonen und isotonen Phasen beeinflußten die Höhe des Proteineinschlusses. Der Prozentsatz der Inkorporation blieb jedoch konstant, wenn die Pufferzusammensetzung oder die extrazellulären Proteinkonzentrationen verändert wurden. Höher war der Proteinschluß, wenn Erythrozyten von Blutkonserven und nicht von frischem Blut verwandt wurden, was auf die verminderte osmotische Resistenz der konservierten Erythrozyten zurückzuführen sein dürfte. Das Volumen der Erythrozytenschatten war bei Messungen mit einem Coulter Counter sowie mit einem Gerät zur fluoreszenzaktivierten Zelltrennung (FACS) kleiner als das normaler Erythrozyten und noch kleiner, wenn Protein eingeschlossen war.
    Notes: Summary Resealed erythrocyte ghosts have been proposed as in vivo carriers for enzyme replacement therapy of inherited metabolic diseases. In comparative studies of methods for reversible hypotonic haemolysis of erythrocytes, a five-fold increased entrapment of human serum albumin was obtained by use of a dialysis procedure instead of direct dilution. The percentage incorporation of protein was also affected by varying mixing procedure, haematocrit, lysis, and resealing times but not by varying buffer composition or added protein concentrations over a wide range. Higher protein entrapment was observed with time-expired blood compared to fresh blood and this may be ascribed to increased osmotic fragility of the erythrocyte membrane in stored cells. Haemolysed and resealed ghosts prepared by any method used were smaller than normal erythrocytes as measured with a Coulter Counter and with a fluorescence-activated cell sorter, and protein entrapment reduced the ghost size further.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Marine geophysical researches 3 (1977), S. 179-196 
    ISSN: 1573-0581
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Ocean bottom seismographs designed to meet the requirements of both seismicity and refraction experiments have been operated extensively on twelve cruises (72 deployments). Signals from a hydrophone, and two geophones (horizontal and vertical) are direct recorded on a modified commercial tape recorder providing 10 day continuous recording at 1/40 ips and a 2–80 Hz band width. The free-fall deployment technique with timed ballast release has yielded a 93% recovery rate (96% over the most recent 24 deployments) despite frequently difficult weather and sea conditions. Emphasis on reliability and operational simplicity has produced an instrument that can be operated in arrays by a single shipboard technician.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Marine geophysical researches 3 (1977), S. 225-228 
    ISSN: 1573-0581
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
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