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  • 1
    ISSN: 1432-1076
    Keywords: Key words Hepatitis C virus ; Hepatitis G virus ; Thalassaemic children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The prevalence of hepatitis C virus (HCV) and a newly identified hepatitis G virus (HGV) and their clinical significance were studied in 42 polytransfused Taiwanese children. Serological assays for antibodies against HCV (anti-HCV) and polymerase chain reaction for serum HCV ribonucleic acid (RNA) and HGV RNA were performed. The prevalence of anti-HCV and HGV RNA was 17% and 14%, respectively in 42 polytransfused children. Anti-HCV seropositives had a significantly higher mean age, peak serum transaminase level, and longer transfusion duration than seronegatives, while children with HGV infection usually had no or only mild hepatitis activities. The prevalence of anti-HCV dropped sharply after implementation of anti-HCV screening, however the prevalence of HGV viraemia remained unchanged. Conclusion HGV infection is not uncommon in polytransfused Taiwanese children and the virus does not cause significant hepatitis compared to HCV infection. Current blood donor screening for anti-HCV can effectively protect polytransfused children from HCV infection but the impact of additional screening for HGV markers awaits further studies.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0509
    Keywords: Key words: Biliary ascariasis—MR cholangiopancreaticography (MRCP)—Endoscopic view—Computed tomography—Children.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of acute common bile duct obstruction caused by a roundworm in a 6-year-old girl is reported. Computed tomography (CT) and magnetic resonance imaging (MRI) showed “bull's-eye” and “eye-glass” appearances of the ascaris in the common bile duct. On reformation of the transverse CT and coronal MR images, the tubular Ascaris was better depicted. MRI and navigator endoscopic demonstrations of the common bile duct ascaris have not been described previously in the literature. These CT and MRI findings may be helpful in the diagnosis of Ascaris.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-7683
    Keywords: optical flow ; inversion of optical flow ; registration of images ; correlation ; passive navigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Optical flow refers to the apparent motion of objects in the image plane, due to either camera or object motion. Applications of optical flow include robotics, image enhancement by means of frame integration, moving-target indication and passive navigation. The purpose of this paper is the simplest and clearest formulation of the dependence of optical flow on the mission and trajectory parameters. Once the canonical equations are established, their invertability is addressed: to what extent can mission parameters be obtained from optical flow? Analysis shows that there are eight independent mission parameters (excluding focal length), so there need to be exactly four relationships among the 12 flow coefficients. These are explicitly exhibited. It is then shown that the solution for the eight mission parameters in terms of the remaining eight independent coefficients hinges on a cubic resolvent. The roots of this resolvent are closely connected to the velocity-to-altitude ratio, and the solution can be constructed in terms of these. This solution generally turns out to be double valued with both sets of mission parameters producing identical optical flows. Fortunately, one of these values can usually be eliminated as inappropriate within the context. The recognition of the dual solution and its explicit equations are believed to be a new contribution. To make the paper more self-contained, algorithms, window selection, correlation measures, and data editing are covered. Much of this material has been previously published by others. The paper concludes with a discussion of the focus of expansion. It is shown that only camera-rotation-free parameters or their conjugates give rise to a focus of expansion. Explicit equations for these parameters are given.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The authors report a case of congenital meningioma in a newborn. This tumour is extremely rare and only six cases have been reported in the literature. Those reported cases were mainly intracranial. This is the first case of a neonatal extracranial meningioma that was evaluated preoperatively by computed tomography and magnetic resonance imaging.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    ISSN: 0003-9861
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2018-04-19
    Description: Predation is considered a major selective pressure in the evolution of fear, but the neurophysiology of predator-induced fear is unknown. We simultaneously recorded lateral amygdala (LA) and prelimbic (PL) area neuronal activities as rats exited a safe nest to search for food in an open space before, during, and after encountering a "predator" robot programmed to surge from afar. Distinct populations of LA neurons transiently increased spiking as rats either advanced or fled the robot, whereas PL neurons showed longer-lasting spike trains that preceded and persisted beyond LA activity. Moreover, discrete LA-PL cell pairs displayed correlated firings only when the animals either approached or fled the robot. These results suggest a general fear function of the LA-PL circuit where the PL participates in the initial detection of potential threats, the LA signals the occurrence of real threats, and the dynamic LA-PL interaction optimizes defensive readiness for action.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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