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  • 1
    Electronic Resource
    Electronic Resource
    Two-beam interferometer for optical constants measurements at near-millimeter wavelengths (1984)
    Springer
    International journal of infrared and millimeter waves 5 (1984), S. 279-299 
    Details
    ISSN: 1572-9559
    Keywords: near millimeter waves ; optically pumped molecular laser ; Rexolite ; TPX ; Dynasil 4000
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simple and versatile instrument for the measurement of optical constants in the near millimeter spectral region is described. Studies of quasi-optical components used in this instrument for effective beam transmission and control are reported. These studies include transmission characteristics of dielectric waveguides and performance of a variable coupler based on frustrated total internal reflection. Operation of this instrument as a two-beam interferometer for determining the index of refraction or as a device to measure transmission for determining the absorption coefficient are described. Values measured with this instrument at 245 GHz, using an optically pumped molecular laser as the source, are reported for several low-loss materials. Appropriate corrections and error estimates are discussed. The potential for improvement and increased accuracies are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009657
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Culture pH, CO2 tension, and cell division in Euglena gracilis ZThis work was supported by United States Public Health Service Grant GM-12179 to Dr. J. R. Cook. (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 96 (1978), S. 253-259 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Growth characteristics of Euglena gracilis Z as functions of culture pH, CO2 tension, temperature, and lighting regime were investigated. The results are consistent with the possibility that cell division is preceded by a lowered intracellular pH. Also consistent with this possibility is the finding that division rhythmicity can be induced by periodic changes in CO2 tension. It is suggested that the rhythmicity is induced by changes in intracellular pH produced by carbonic acid.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040960214
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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