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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/General Subjects 343 (1974), S. 632-637 
    ISSN: 0304-4165
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/General Subjects 297 (1973), S. 441-451 
    ISSN: 0304-4165
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Optics Communications 42 (1982), S. 63-66 
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0584
    Keywords: CFU-C ; Leukozyten CSA ; tageszeitbedingte Schwankungen ; CFU-C ; Leucocyte CSA ; Diurnal and ultradial variations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Blood colony-forming cells (CFU-C) and colony-stimulating activity obtained from feeder layers of peripheral blood leucocytes (leucocyte CSA) have been studied in 69 normal subjects by means of semisolid agar culture system. Groups of normal volunteers were selected according to sex and age (20 to 45 and older than 60 years) and the results compared. The mean number of circulating CFU-C was significantly lower in young women (20–45 years old) than in males over 60 years of age, but no differences were found among the other age and sex groups. Leucocyte CSA did not significantly differ among these groups. In 5 young males the blood CFU-C did not show significant variations at 8 AM and at 4 PM of the same day. When the study was repeated in 18 subjects at longer time intervals, the number of colonies showed a maximum fivefold variation. The amount of plasma and polymorphonuclear granulocytes present in our culture system did not inhibit the colony growth. In most cases, double layer cultures grow a higher number of colonies than single layer, but feeder layers of some normal subject seem to inhibit the colony growth.
    Notes: Zusammenfassung Koloniebildende Zellen (CFU-C) aus dem Blut und Koloniestimulierte Aktivität aus dem „feeder layer“ peripherer Blutleukozyten (Leukozyten-CSA) wurden in einem halbflüssigen Agarkultur-System bei 69 Normalpersonen untersucht. Gesunde Freiwillige wurden nach Geschlecht und Alter (20–45 Jahre und älter als 60 Jahre) in Gruppen unterteilt. Der Anteil der zirkulierenden CFU-C war bei jungen Frauen (20–45 Jahre) signifikant niedriger als in der Gruppe älterer Männer (älter als 60 Jahre), jedoch waren die Unterschiede zwischen den übrigen Gruppen nicht signifikant. Leukozytäre CSA unterschied sich in den verschiedenen Gruppen nicht signifikant. Bei 5 jungen Männern wurden zirkulierende CFU-C am selben Tag morgens um 8.00 und nachmittags um 16.00 Uhr untersucht: Es ergaben sich keine unterschiedlichen Werte. Bei 18 Personen wurden die Untersuchungen nach längeren Zeitintervallen wiederholt: Die Anzahl der gebildeten Kolonien variierte maximal um das Fünffache. Plasma und segmentkernige Granulozyten, wie sie im angewandten Kultursystem üblich waren, inhibierten das Wachstum der Kolonien nicht. In den meisten Fällen ließen sich in doppelschichtigen Kultursystemen höhere Koloniezahlen erreichen als in einschichtigen, jedoch schienen die „feeder layer“ einiger normaler Personen das Koloniewachstum zu inhibieren.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 14 (1982), S. 237-243 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Single-mode operation of an atmospheric-pressure TE CO2 laser is reported. Single longitudinal mode emission has been achieved by incorporating a low-pressure, transversely excited gain section in the same laser cavity as the atmospheric-pressure section. The effects of different resonator configurations on the system modal behaviour have been investigated and it is shown that unstable resonators are particularly suitable for controlling the transverse mode structure with a complete coverage of the excited medium. With an unstable resonator configuration, formed by a metallic convex mirror and a plane diffraction grating, single longitudinal and single transverse mode output pulses with energy up to 2 J have been produced on more than 40 lines of both the 9.4μ m and 10.4μ m bands. This technique can easily be scaled to larger aperture devices at higher extracted energies.
    Type of Medium: Electronic Resource
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