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  • viscosity  (6)
  • Magnetic resonance imaging  (5)
  • Analytical Chemistry and Spectroscopy  (2)
  • Anterior choroidal artery  (2)
  • 1
    Electronic Resource
    Electronic Resource
    MRI of anterior spinal artery syndrome of the cervical spinal cord (1992)
    Springer
    Neuroradiology 35 (1992), S. 25-29 
    Details
    ISSN: 1432-1920
    Keywords: Anterior spinal artery syndrome ; Cervical spinal cord ; Infarct ; Magnetic resonance imaging ; Spinal angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cervical spinal cord lesions in the anterior spinal artery syndrome were delineated on magnetic resonance images (MRI) in four patients. The lesion was always seen anteriorly in the cervical cord. On T2-weighted images, the lesions appeared hyperintense relative to the normal spinal cord, while on T1-weighted images, two chronic lesions appeared hypointense, with local atrophy of the cord. In one case, repeated T1-weighted images showed no signal abnormality 4 days after the ictus, but the lesion became hypointense 18 days later, when contrast enhancement was also recognized after injection of Gd-DTPA; this sequence of intensity changes was similar to that of cerebral infarction. The extent of the lesion seen MRI correlated closely with neurological findings in all cases. Although the findings may not be specific, MRI is now the modality of choice for confirming the diagnosis in patients suspected of having an anterior spinal artery syndrome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588273
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  • 2
    Electronic Resource
    Electronic Resource
    Cranial MRI and MR angiography in Menkes' syndrome (1993)
    Springer
    Neuroradiology 35 (1993), S. 556-558 
    Details
    ISSN: 1432-1920
    Keywords: Menkes' syndrome ; Magnetic resonance imaging ; Magnetic resonance angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report two boys with Menkes' syndrome who underwent cranial MRI and MR angiography (MRA). In both, CT and MRI revealed progressive cerebral atrophy with a subdural haematoma or effusion. Delayed myelination or dysmyelination of the white matter was suggested. Tortuosity of the cervical and intracranial vessels was well demonstrated by MRA, obviating more invasive conventional angiography should it be thought necessary to demonstrate the characteristic systemic vascular changes of this syndrome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588724
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Retrograde filling of the anterior choroidal artery: vertebral angiographic sign of obstruction in the carotid system (1992)
    Springer
    Neuroradiology 34 (1992), S. 504-507 
    Details
    ISSN: 1432-1920
    Keywords: Cerebral angiography ; Collateral circulation ; Anterior choroidal artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Retrograde filling of seven anterior choroidal arteries from the posterior circulation was observed on a vertebral angiogram in six patients with occlusion of the proximal anterior choroidal artery or of the internal carotid artery. In one patient with thrombotic occlusion of the internal carotid artery, the enlarged anterior choroidal artery functioned as a major collateral pathway from the posterior circulation to the territory of the middle cerebral artery. Retrograde filling of the anterior choroidal artery is a sign of obstruction changes in the ipsilateral carotid artery at or proximal to the origin of the anterior choroidal artery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00598961
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Reye's syndrome with cortical laminar necrosis: MRI (1996)
    Springer
    Neuroradiology 38 (1996), S. 269-272 
    Details
    ISSN: 1432-1920
    Keywords: Key words Reye's syndrome ; Cortical laminar necrosis ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Serial MRI findings are described in two patients with Reye's syndrome, demonstrating diffuse cortical and white matter changes. In the acute stage, T2-weighted images showed subtle but definite laminar high signal and contrast-enhanced T1-weighted images laminar enhancement, along the entire cerebral cortex bilaterally. In the chronic stage, unenhanced T1-weighted images showed diffuse cortical laminar high signal. These characteristic MRI features seemed very similar to those of laminar cortical necrosis in hypoxic brain damage. MRI also displayed delayed white matter changes with cerebral atrophy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00596545
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  • 5
    Electronic Resource
    Electronic Resource
    The anterior choroidal artery syndrome (1994)
    Springer
    Neuroradiology 36 (1994), S. 337-339 
    Details
    ISSN: 1432-1920
    Keywords: Microangiography ; Anterior choroidal artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The distribution of the anterior choroidal artery (AChA) was analysed on coronal, sagittal and axial microangiograms of cadaver brains. On axial sections, the territory of the AChA was confirned to an arcuate zone between the striatum anterolaterally and the thalamus posteromedially. On sagittal sections, fine vessels from the cisternal part of the AChA were seen to extend upwards and somewhat posteriorly into the region of the posterior limb of the internal capsule. On coronal sections, ascending branches of the AChA coursed latcrally and then upwards to penetrate the globus pallidus and the inferior portion of the posterior limb of the internal capsule, apparently terminating at the lateral border of the thalamus. Determining the distribution of this artery on multiplanar sections was helpful for interpreting pathological changes, including infarcts, occurring in this region on multiplanar CT and/or MR images.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00612113
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  • 6
    Electronic Resource
    Electronic Resource
    Reye's syndrome with cortical laminar necrosis: MRI (1996)
    Springer
    Neuroradiology 38 (1996), S. 269-272 
    Details
    ISSN: 1432-1920
    Keywords: Reye's syndrome ; Cortical laminar necrosis ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Serial MRI findings are described in two patients with Reye's syndrome, demonstrating diffuse cortical and white matter changes. In the acute stage, T2-weighted images showed subtle but definite laminar high signal and contrast-enhanced T1-weighted images laminar enhancement, along the entire cerebral cortexbilateraly. In the chronic stage, unenhanced T1-weighted images showed diffuse cortical laminar high signal. These characteristic MRI features seemed very similar to those of laminar cortical necrosis in hypoxic brain damage. MRI also displayed delayed white matter changes with cerebral atrophy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00596545
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Serial imaging in MELAS (1997)
    Springer
    Neuroradiology 39 (1997), S. 427-430 
    Details
    ISSN: 1432-1920
    Keywords: Key words Mitochondrial cytopathy ; MELAS ; Computed tomography ; Magnetic resonance imaging ; Single-photon emission computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report two patients with fatal mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS). Single-photon emission computed tomography (SPECT) with 123I-N-isopropyl-p-iodoamphetamine was more sensitive to the lesions than CT or MRI. SPECT showed focal hyperperfusion before or during the stroke and diffuse hypoperfusion of the brain, sparing the basal ganglia in the terminal stages. These findings support the theory that metabolic disturbance in the brain causes the “stroke” in MELAS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050438
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  • 8
    Electronic Resource
    Electronic Resource
    Viscosity of saturated liquid fluorocarbon refrigerants from 273 to 353 K (1991)
    Springer
    International journal of thermophysics 12 (1991), S. 105-117 
    Details
    ISSN: 1572-9567
    Keywords: capillary viscometer ; fluorocarbons ; refrigerants ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Viscosity measurements were carried out on saturated liquid fluorocarbon refrigerants using an improved capillary viscometer for 11 kinds of fluorocarbon refrigerants; CCl3F (R11), CCl2F2 (R12), CHClF2 (R22), CBrF3 (R13B1), CH3CHF2 (R152a), CCl2FCClF2 (R113), CHCl2CF3 (R123), CHClFCClF2 (R123a), CH3CF3 (R143a), CClF2CCl2F2 (R114), and CH2FCF3 (R134a), in the temperature range from 273 to 353 K. An equation is given to represent the viscosity as a function of temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00506125
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Liquid viscosities and densities of HFC-134a+glycol mixtures (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 45-53 
    Details
    ISSN: 1572-9567
    Keywords: density ; diethylene glycol ; ethylene glycol ; HFC-134a ; polyethylene glycol ; polypropylene glycol ; tetraethylene glycol ; triethylene glycol ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Liquid viscosity and density of six binary mixtures of HFC-134a with glycols [ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (400), and polypropylene glycol (2000)] have been measured in the temperature range from 273 to 333 K. The viscosity was measured by a rolling-ball viscometer calibrated with standard liquids of viscosities and densities (JS5, JS10, JS20, and JS50). The density was measured with a glass pycnometer. The uncertainties of the measurements were estimated to be less than 3.4 % for viscosity and 0.04 % for density, respectively. An equation is given to represent the obtained viscosity values as a function of weight fraction and temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00522660
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  • 10
    Electronic Resource
    Electronic Resource
    Viscosity of nitrous oxide in the critical region (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 603-626 
    Details
    ISSN: 1572-9567
    Keywords: critical anomaly ; mode-coupling theory ; nitrous oxide ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The gaseous viscosity of nitrous oxide (N2O) was measured in the critical region. The experimental temperature range was between 309.650 and 318.150 K and the pressure range was up to 9.6 MPa. The measurements were obtained with an oscillating-disk viscometer, combined with local determination of the density at the position of the oscillating disk, and they have an estimated accuracy of 0.6 % for viscosity and 0.5 % for gas density. The viscosity of N2O exhibits an anomalous increase near the critical point. The anomalous increase in viscosity was analyzed with the viscosity equation proposed by Basu and Sengers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01563790
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    Paper (German National Licenses)
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