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  • 1
    Electronic Resource
    Electronic Resource
    Measurements of the total solid material in the bands and interbands of the polytene chromosomes in living cells of chironomus (1963)
    Springer
    Chromosoma 14 (1963), S. 111-122 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The refractive indices of a number of bands and interbands of the polytene chromosomes in the living salivary gland cells of two species of Chironomus were measured with an interference microscope, and values were obtained for the total solid material present in each region. To make these measurements it was necessary to compress the cells until virtually no cytoplasm lay above or below the nucleus, but this produced no deleterious effects on the cells as a whole. The results indicated that there is not less than 25% of solid material in the band regions of these chromosomes, and not more than 15% of solids in the interbands. The nuclear sap of these cells was found to contain about 12% of solid material. Similar refractive index measurements were made on the bands and interbands of isolated chromosomes mounted in saline and in a 12% isotonic saline/protein solution of the same refractive index as the nuclear sap. In both these media the bands were again found to contain at least 10% more material than the interbands, but their refractive indices were lower in the saline than they were in the intact cells and markedly higher in the saline/protein. It is therefore concluded that the isolated chromosomes are, to some extent, permeable, and can permit the entry of protein molecules from the mounting medium and the egress of some or their own material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332611
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of the Refractive Index of Cytoplasmic Inclusions in Living Cells by the Interference Microscope (1954)
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 836-837 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] With the interference microscope, on the contrary, it is possible to measure the actual phase changes produced by objects, and it recently occurred to me that, by its aid, the technique developed by Dr. Barer and his associates might be extended so as to measure the refractive index of cytoplasmic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/174836c0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Refractometry of Living Cells (1953)
    [s.l.] : Nature Publishing Group
    Nature 171 (1953), S. 720-724 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SURPRISINGLY little attention has been devoted i^ in the past to the determination of the refractive index of living protoplasm. Earlier workers who investigated the subject were apparently content simply to record values without interpreting their meaning, and the methods employed were rather ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/171720a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A Critical Method of measuring the Diameter of Living Bacteria with the Interference Microscope (1955)
    [s.l.] : Nature Publishing Group
    Nature 176 (1955), S. 1076-1077 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] With the interference microscope, however, it is possible to measure very critically the amount by which the light is changed in phase as it passes through an object, and, since this phase-change is proportional to the product of the object's refractive index and thickness, it should be possible to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1761076a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Distribution of Ribosomal RNA in Fusing Myoblasts (1970)
    [s.l.] : Nature Publishing Group
    Nature 226 (1970), S. 545-547 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] K. F. A. R. and D. E. J.2 used a densitometric method to measure the amounts of RNA in randomly selected pairs of fusing chick embryo myoblasts and single myoblasts growing in tissue culture. Their findings, with the results of statistical tests that have recently been applied to these data, are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/226545a0
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    Paper (German National Licenses)
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