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  • 1
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0968-4328
    Keywords: Cerebral microcirculation ; confocal microscopy ; cranial window ; fluorescent dyes ; intracellular ion concentrations ; ischemia ; laser ; leukocytes ; meningitis ; opto-acoustic device ; slit scanning
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 777 (1996), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Notes: Near infrared spectroscopy (NIRS) is a new technique that permits noninvasive monitoring of cerebral blood and tissue oxygenation. Recently, we and others have shown that NIRS measurements are sensitive enough to follow changes in cerebral hemoglobin oxygenation due to activation of brain function. Based on these findings we have assessed the influence of aging as well as the influence of neurodegeneration on cerebral hemoglobin oxygenation during mental work. The typical NIRS pattern in young healthy subjects while performing calculation tasks measured in the frontal cortex were increases in oxygenated hemoglobin [HbO2] and total hemoglobin [HbT] while reduced hemoglobin [HbR] decreased. Elderly healthy subjects showed a significant lower mean increase in [HbO2] and [HbT] levels. Regression analysis revealed an age-dependent decline in activation-induced local increase of [HbO2] as well as [HbT]. Furthermore, we monitored changes in cerebral hemoglobin oxygenation in the frontal cortex while patients with probable Alzheimer's disease (AD) performed cognitive tasks. Whereas elderly healthy subjects (as well as patients with major depression, age-associated memory impairments or vascular dementia) again showed clear increases in the local concentrations of [HbO2] and [HbT] during brain activation, AD patients showed significant decreases compared to the baseline levels in both variables that were most pronounced in the parietal cortex. To clarify whether the different patterns in cerebral hemoglobin oxygenation during cognitive activation were due to an altered functional brain organization in AD or to alterations in the cerebrovascular response to neuronal activation, we are currently performing simultaneous NIRS and (015-H20-)PET measurements during performance of a cognitive task (Stroop test). Our finding of a regional reduced oxygen supply during activation of brain function may be of relevance to the development and the time course of neurodegeneration.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Zerebrale Lymphome ; Kleinhirnbrückenwinkel ; Neubildung ; Mixed-connective-tissue-disease ; Key words Cerebellopontine angle ; Neoplasms ; Lymphoma ; Mixed connective tissue disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The clinical features of progression sensorineural hearing loss and vertigo in combina-tion with the radiologic finding of a contrast- enhancing mass within the inner auditory canal are suggestive of an acoustic neuroma. We report our findings in a 57-year-old woman with known mixed connective tissue disease who was presumed to have a neuroma. A large malignant lymphoma of the cerebellopontine angle presented clinically with a primary acoustic none palsy and no other central neurological deficits. Both the primary radiological examinations and the exclusively peripheral nerve palsy failed to indicate manifestationes of a lymphoma. The development of a progressive facial palsy within 8 weeks of presentation and an atypi-cal occipital headache were uncommon findings for an acoustic neuroma. Such changes in symptoms despite the occurrence of car-dinal symptoms require further diagnostic measures. Manifestations of a malignant lymphoma in the cerebellopontine angle are extremely rare. To our knowledge a case of an intracerebral lymphoma in a patient with Sjögren’s syndrome has never been reported before.
    Notes: Zusammenfassung Das Vorliegen der klinischen Symptome einer progredienten Innenohrschwerhörigkeit, Schwankschwindel und der gleichzeitige radiologische Nachweis einer kontrastmittelaufnehmenden Raumforderung des inneren Gehörgangs erhärten den Verdacht auf das Vorliegen eines Akustikusneurinoms. Wir berichten über eine 57jährige Patientin mit anamnestisch bekanntem Sharp-Syndrom und der zunächst typischen Befundkonstellation. Die vorgestellte Kasuistik zeigt einen Fall eines großen Lymphoms im Bereich des Kleinhirnbrückenwinkels, der sich mit einem peripheren Hirnnervenausfall im HNO-Bereich und zunächst fehlender zentraler Neurologie äußerte. Weder die primäre radiologische Diagnostik noch der Ausfall ausschließlich peripherer Hirnnerven ließen präoperativ das Vorliegen eines Lymphoms vermuten. Die innerhalb weniger Wochen aufgetretene Fazialisparese und die typischen okzipitalen Cephalgien mit Ausstrahlung ins Ohr sind für ein Akustikusneurinom eher ungewöhnlich. Eine suspekte Befundkonstellation wie in dem von uns geschilderten Fall muß trotz vorliegender Leitsymptome herausfordern, eine differentialdiagnostische Abklärung herbeizuführen. Die Manifestation solitärer Lymphome im Kleinhirnbrückenwinkel gilt als Rarität. Dies ist der erste Bericht über ein intrazerebrales Lymphom bei Sharp-Syndrom.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 239 (1992), S. 359-360 
    ISSN: 1432-1459
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Optical techniques already have an important place in experimental in vivo studies of the brain. New techniques to study micro circulatory and metabolic events in vivo will play an important role in basic stroke research. Functional studies are rapidly improving our knowledge of the functional architecture of the visual cortex. For studies of the human brain the confluence of interest and activity in MRI, PET, ballistic and diffusive wave spectroscopy opens new fields of anatomical, physiological, biochemical and functional studies. Similar to the introduction of the morphologically oriented computed tomography and magnetic resonance imaging, these new approaches may have a profound impact on clinical and experimental neurology in the future. The proceedings of this symposium will be published within the seriesAdvances in Experimental Medicine and Biology, Plenum Press, London New York, fall 1992.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-4978
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Free cytoplasmic 40S mRNP particles from rat liver were treated with EDTA and separated into two populations of RNP particles with sedimentation maxima of 20S and 35S, respectively. A characteristic set of distinct scRNAs is found for 20S and 35S RNP particles. The sequences of two of the most abundant scRNAs from 20S RNP particles with chain lengths of 104 (α1-RNA) and 124 (β1-RNA) nucleotides, respectively, are presented. α1-RNA shows a high sequence homology to the 3′-end of 18S rRNA. Since α1-RNA carries a cap, it cannot be a degradation product of 18S rRNA. The β1-RNA is strongly post-transcriptionally modified, but uncapped. When the individual scRNAs of 20S and 35S RNP particles isolated from preparative polyacrylamide gels were assayed for their capability to inhibit in vitro protein synthesis, several potent translational inhibitory RNAs were detected. Particularly, the scRNAs of 147, 203 and 263 nucleotide length associated with the 35S RNP particles turned out to be strong inhibitors of protein synthesis.
    Type of Medium: Electronic Resource
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