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  • 1
    ISSN: 1572-9605
    Keywords: Cuprates ; superconductivity ; optical microscopy ; phase differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A common mineralogical technique for identifying individual crystals in a heterogeneous, polycrystalline sample involves the observation at room temperature of their colors in reflected polarized light (colors of polarization). Here we present the observation that a brownish yellow (golden) color of polarization is not only characteristic of the YBa2Cu3O7 superconductor, but of the cuprate superconductors in general and is correlated with the occurrence of superconductivity.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1433-0350
    Keywords: Brainstem auditory evoked responses ; Brainstem dysfunction ; Congenital hydrocephalus ; Ventriculoperitoneal shunt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Brainstem auditory evoked responses (BAER) were studied in 20 children with clinically diagnosed and CT-confirmed congenital hydrocephalus before and after shunt surgery. Ninety-five percent of the children showed abnormal responses preoperatively. Prolonged wave V latency was the most common abnormality, followed by increased interwave latencies. Total absence of evoked responses was more common in children with communicating hydrocephalus. Following shunt surgery 50% of cases returned to normal and 20% showed a significant improvement. Abnormalities persisted in 10% of cases. BAER abnormalities referrable to caudal brainstem dysfunction recovered first, following CSF diversion. Study of BAER is useful for identifying physiological brainstem abnormalities in hydrocephalic children and promises to be a sensitive non-invasive diagnostic tool for the detection of “non-infective complications” of shunt surgery, if performed serially during follow up.
    Type of Medium: Electronic Resource
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