61 research outputs found

    Depth Profiling Photoelectron-Spectroscopic Study of an Organic Spin Valve with a Plasma-Modified Pentacene Spacer

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    [[abstract]]We report an enhanced magnetoresistance (MR) in an organic spin valve with an oxygen plasma-treated pentacene (PC) spacer. The spin valve containing PC without the treatment shows no MR effect, whereas those with moderately plasma-treated PC exhibit MR ratios up to 1.64% at room temperature. X-ray photoelectron spectroscopy with depth profiling is utilized to characterize the interfacial electronic properties of the plasma-treated PC spacer which shows the formation of a derivative oxide layer. The results suggest an alternative approach to improve the interface quality and in turn to enhance the MR performance in organic spin valves.[[incitationindex]]SCI[[booktype]]電子

    Long-term follow-up of an adolescent who had bilateral striatal necrosis secondary to Mycoplasma pneumoniae infection

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    We describe the long-term follow-up of a patient with bilateral striatal necrosis associated with Mycoplasma pneumoniae infection occurred in adolescence. In the literature there are no longitudinal studies of such a rare condition. Our patient, 4 years after the onset of an acute and reversible akinetic-rigid syndrome, showed a severe obsessive-compulsive disorder, cognitive decline, and a neuropsychological profile characterized by signs of deficient executive functioning. The clinical picture that emerged in our patient is suggestive of a frontosubcortical dementia which might be considered a major long-term sequela of the bilateral selective striatal necrosis and consequent dysfunction of frontostriatal connections

    Subcortical dementia associated with striking enlargement of the Virchow-Robin spaces and transneural degeneration of the left mammillo-thalamic tract

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    We report a case of subcortical dementia in a 68-year-old woman. MR examination of the patient's brain revealed two types of alterations as a possible cause of the dementia, both anomalous in respect of their entity and incidence: the first was a striking enlargement of the Virchow-Robin spaces, and the second an anterograde transneural degeneration of the left mammillo-thalamic tract and mammillary body secondary to a lacunar infarction of the ipsilateral anterior thalamus. Copyright © 2001 S. Karger AG, Basel

    MR brain investigation in thirty-five children with Leber's congenital amaurosis

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    There are few literature reports of MR study in children with Leber's congenital amaurosis, a severe early onset autosomal recessive retinal dystrophy. We describe the clinical and neuroradiological findings in 35 patients. Of these, 22 had a normal brain MR scan, four showed mild dilatation of the cortical sulci, two had mild optic-chiasmatic thinning, three showed aspecific white matter changes not involving the primary visual pathway and four had ``molar tooth'' mesencephalic malformation. Our series confirms literature findings of normal signal and morphology of the primary optic pathway. Posterior cranial fossa abnormalities, defined as rhombencephaloschisis, was associated with a clinical picture different from that of the other patients. This abnormality is encountered in different malformations associating cerebellar, ocular and renal abnormalities. MR brain study in children with Leber's congenital amaurosis is recommended not only to assess the visual pathways, but also to analyse the posterior cranial fossa and cerebellum
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