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  • 1
    Electronic Resource
    Electronic Resource
    Ultrasound, computed tomography and endoscopic retrograde cholangiopancreatography in the morphologic diagnosis of pancreatic disease (1983)
    Springer
    Journal of molecular medicine 61 (1983), S. 291-296 
    Details
    ISSN: 1432-1440
    Keywords: Ultrasound ; Computed tomography ; Endoscopic retrograde cholangiopancreatography ; Chronic pancreatitis ; Pancreatic tumor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary From February to November 1981 the diagnostic relevance of ultrasound (US), computed tomography (CT) and endoscopic retrograde cholangiopancreatography (ERCP) was compared prospectively in 75 patients with suspected pancreatic disease. Final diagnosis was confirmed by autopsy, surgery, clinical course, and further laboratory data. Thus it was possible to exclude pancreatic disorders in 32 patients. By ERCP we diagnosed all tumors; sensitivity was 100%. Sensitivity of US and CT were 63% each. In five cases US made the false positive diagnosis” pancreatic malignant tumor” (specifity 93%), CT and ERCP in two cases (specifity 97% each). In chronic pancreatitis specifity of US and ERCP were 100% and specifity of CT was 98%. Sensitivity of ERCP amounted to 93%, CT and US revealed 74% and 52%, respectively. We conclude that ERCP is the best morphologic diagnostic tool in differentiating chronic pancreatitis from pancreatic carcinoma. US is a good screening method and CT reveals good diagnostic results in acute pancreatitis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01497778
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of luminance and flicker on ocular dominance shift in kitten visual cortex (1984)
    Springer
    Experimental brain research 54 (1984), S. 186-190 
    Details
    ISSN: 1432-1106
    Keywords: Monocular deprivation ; Kitten visual cortex ; Scotopic vision ; Visual flicker ; Ocular dominance shift
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We raised monocularly deprived kittens in visual environments with low level illumination that was either steady or flickering. With steady scotopic luminance ocular dominance shifted as it does in normal photopic lighting. In flickering light with an average frequency of 2 Hz there was virtually no ocular dominance shift, while in flickering light averaging 0.1 Hz there was a significant shift. Recordings from the 2 Hz flicker-reared were similar to the dark-reared recordings. The flickering illumination was produced in one case by a high contrast-low brightness TV near the cage, and in another case, by a low voltage incandescent bulb driven by a pseudo-random sequence generator. This circuit delivered either a maximum ON time of 1.7 s or a maximum of 40 s, for the 2 Hz and 0.1 Hz respectively. Both the TV and flickering bulb produced average illumination comparable to the dim (0.01 cd/ m2) steady scotopic illumination. We conclude that dim flickering light is not a sufficient stimulus for promoting ocular dominance shift in kittens in the critical period unless the flicker rate approaches 0.1 Hz. Furthermore results from the TV rearing suggest that flicker may be capable of preventing an ocular dominance shift expected from a concurrent steady low light level background.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235830
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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