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  • 1
    Electronic Resource
    Electronic Resource
    Phosphor plate mammography: contrast studies and clinical experience (1992)
    Springer
    European radiology 2 (1992), S. 483-487 
    Details
    ISSN: 1432-1084
    Keywords: Mammography ; Phosphor plates ; Modulation transfer function ; Image contrast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Mammography and accurate microcalcification detection require very good spatial resolution. We have compared the diagnostic capabilities of reduced-exposure, third-generation, 5 cycles/mm computed radiography (CR) phosphor plates with conventional screen-film in 67 patients. No difference in diagnostic accuracy was detected. The digital characteristics of storage phosphor plates erabled us to study the relationship between contrast and spatial resolution. We developed a computer program to identify a single 100 μm pixel in a digital image and assign various gray levels to that pixel. Using this model, we determined that, for our 5 cycles/mm CR system, the imaged contrast of a 100 μm object was 62% of the original contrast. Current 5 cycles/mm phosphor plate systems cannot adequately detect microcalcifications that approximate 100 μm or smaller unless a magnification technique is used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00176358
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microbial degradation of cellulose polymers used in cosmetics and toiletries (1987)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 9 (1987), S. 0 
    Details
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Cellulose polymers which are commonly found in cosmetics can act as potential targets for microbial attack and sometimes support extensive growth under suitable conditions. As a result, cellulosic substances can be converted from a stiff gel into a running liquid, thereby rendering the cosmetic unfit for use.To provide an understanding of the biodeterioration of cellulose in cosmetics, this paper reviews the structure of cellulose, mechanism of enzyme degradation and effects of structural properties of cellulose on the rate of hydrolysis. At least three different types of enzymes (exo-β-1, 4-glucanase, endo-β-1,4-glucanase and β-glucosidase) are involved in the degradation of crystalline cellulose. Enzyme production by three fungi belonging to the genera Aspergillus, Fusarium and Penicillium is described. Dégradation microbienne des polymers de cellulose utilisés dans les produits cosmétiques et de toilette
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-2494.1987.tb00464.x
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    Paper (German National Licenses)
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