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  • 1
    Publication Date: 2022-07-07
    Language: English
    Type: conferenceobject , doc-type:conferenceObject
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Chemistry of materials 7 (1995), S. 2252-2258 
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 18 (1985), S. 1235-1240 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 408-413 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 414-421 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1420-908X
    Keywords: Tumour necrosis factorα ; Interleukin-1β ; Myeloperoxidase ; Tissue-chamber (mouse) ; Inflammation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A tissue-chamber model of inflammation in mice has been modified and used to investigate the kinetics of zymosan-induced inflammatory mediators such as tumour necrosis factorα (TNFα), interleukin-1β (IL-1β) and prostaglandin E2 (PGE2). In addition, the influx of polymorphonuclear leukocytes (PMN) into the chamber fluid and the granuloma surrounding the chamber was measured by myeloperoxidase (MPO) activity using a new microtitre plate assay. TNFα and IL-1β reached peak concentrations at 3 and 6 h respectively after zymosan injection. Intermediate high concentrations of IL-1β were observed until the end of the experiment at 72 h, but TNFα concentrations decreased from 24 h to biologically insignificant values. In contrast, exudate PGE2 and MPO activity increased up to 24 h after zymosan injection and remained high until 72 h. At 6h after zymosan challenge, oral pre-treatment with prednisolone (3 to 30mg/kg) dose-dependently reduced TNFα, IL-1β and PGE2 concentrations while indomethacin (0.3 to 3 mg/kg) significantly attenuated PGE2, slightly enhanced TNFα and had no effect on IL-1β concentrations in the exudate. Both drugs had similar potencies against exudate and tissue MPO activities. Prednisolone inhibited IL-1β at 72 h post-zymosan. Indomethacin was more potent than prednisolone against PGE2 (ID50 of 〈0.3 versus 0.6mg/kg). The data obtained confirm the usefulness and reliability of this model in evaluating the effects of anti-inflammatory agents on inflammatory mediators induced by zymosan.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 27 (1992), S. 67-72 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Ein Finite-Differenzen-Verfahren findet Anwendung zur Berchnung der Wärmeübertragungsleistung mittels Konvektion und Strahlung an Rippen, die rechteckige, trapezförmige, dreieckige und konkav-parabolische Formen besitzen. Die Berechnungen setzen eine eindimensionale, stetige Wärmeleitung in den Rippen voraus und vernachlässigen den Strahlungsaustausch zwischen aneinandergrenzenden Rippen und zwischen den Rippen und ihrer Oberfläche. Für den betrachteten Bereich der thermischen und geometrischen Parameter wurde herausgefunden, daß die Veränderung der Wärmeübertragungsrate und des Rippenwirkungsgrades der anderen Profilformen im Bereich von 11 Prozent im Vergleich zur Rechteckform liegen. Der Einfluß der Profilform ist am stärksten, wenn die Biot-ZahlBi und die StrahlungszahlN r im Vergleich zu 1 klein sind. Aufgrund einiger einschränkender Annahmen sollten die Ergebnisse nur für die Voruntersuchungen und den Vorentwurf benutzt werden, insbesondere wenn es sich um eine Rippenanordnung und nicht um eine Einzelrippe handelt.
    Notes: Abstract A finite difference method is used to predict the performance of convecting-radiating fins of rectangular, trapezoidal, triangular, and concave parabolic shapes. The analysis assumes one-dimensional, steady conduction in the fin and neglects radiative exchange between adjacent fins and between the fin and its primary surface. For the range of thermal and geometrical parameters investigated, the variation of heat transfer rate and the fin efficiency with other profile shapes was found to be within 11 percent of the rectangular shape. The effect of profile shape is most pronounced when the Biot number,Bi, and radiation number,N r, are small compared to unity. Because of several limiting assumptions, the results would be used only for preliminary analysis and design particularly when a fin assembly is involved rather than an individual fin.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 9 (1999), S. 336-343 
    ISSN: 1432-1084
    Keywords: Key words: Cryptorchidism ; Scrotum ; US ; CT ; MRI ; Testis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Imaging evaluation of the patient with a non-palpable testis has evolved over recent decades. The rational explanation of imaging in these patients requires a clear understanding of the various causes of a non-palpable testis, and an appreciation of the utility and limitations of the available imaging modalities. This review describes the classification of non-palpable testis and discusses the role of modern imaging in evaluation. In particular, the relative accuracies of ultrasound, CT and MRI is reviewed.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0942-0940
    Keywords: Keywords: Accuracy central sulcus; cortical mapping; frameless neuronavigation; image guided surgery.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary  Background. The purpose of this prospective study was to localize the central sulcus by frameless neuronavigation and to project this anatomical structure to the outside of the skull on the skin. This method was analyzed in respect to its practicability, accuracy, and potential applications.  Method. In 27 patients investigated (28 unaffected hemispheres), the central sulcus was virtually projected to the outside of the skull using frameless neuronavigation and a virtual pointer elongation of 15 or 20 mm. The following parameters were measured on the scalp: 1. the distance between the bregma and the midline junction of the central sulcus, and 2. the angle between the central sulcus and the midline. These dada were compared with measurements based on the original axial MR images of these patients. Finally, a laboratory phantom study was designed in analogy to a patient's examination for estimation of the overall accuracy of the neuronavigation system in the experimental setup used in this study.  Findings. Virtual pointer projection of the central sulcus to the outside of the skull using frameless neuronavigation was found to be easily possible. The distance between the bregma and the midline junction of the central sulcus amounted to a mean of 55 mm on the left and 56 mm on the right. The angle between the central sulcus and the midline reached a mean of 63° on the left and 60° on the right. These data confirmed results of other studies with no frameless neuronavigation devices. The phantom study revealed a mean overall inaccuracy of 0.9 mm at a virtual pointer elongation of 15 mm. At a virtual pointer elongation of 20 mm, the mean overall inaccuracy of our study was 1.1 mm. These results correspond to the inaccuracy of frame based stereotaxy.  Interpretation. It is easily possible, valid, and reliable to virtually project the central sulcus to the outside of the skull with an acceptably low inaccuracy using frameless neuronavigation. This is important for research studies that correlate and integrate different functional imaging methods with the aid of frameless neuronavigation.
    Type of Medium: Electronic Resource
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