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  • 1
    Electronic Resource
    Electronic Resource
    Cystic islet cell tumors: Radiologic findings in three cases (1994)
    Springer
    Abdominal imaging 19 (1994), S. 225-228 
    Details
    ISSN: 1432-0509
    Keywords: Pancreas, neoplasms ; Islet cell tumors, diagnosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report three cases of cystic islet cell tumors, two caused by gastrinomas and the other by an islet cell carcinoma. All three patients underwent computed tomography (CT) and angiography and two also had magnetic resonance (MR) imaging. Several common radiographic findings were present as follows: thickening of the cyst wall and irregularity of the inner surface on postcontrast CT and MR images, neovascularity and a densely staining hypervascular rim on angiography, and moderately increased signal intensity of the cyst content on T1-weighted MR images, which indicated fluid containing blood and/or necrotic tissue. These findings are helpful in defining the nature of these lesions and strongly suggest that cystic islet cell tumor should be included in the differential diagnosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203512
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  • 2
    Electronic Resource
    Electronic Resource
    Selective loss of nigral neurons in Pick's disease: a morphometric study (1990)
    Springer
    Acta neuropathologica 81 (1990), S. 155-161 
    Details
    ISSN: 1432-0533
    Keywords: Pick's disease ; Substantia nigra ; Pigmented neurons ; Morphometry ; Parkinsonism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Loss of neurons from the substantia nigra (SN), which is often encountered in Pick's disease, was quantitatively analyzed in 13 cases of Pick's disease and 19 age-matched controls. On sections from the upper and lower portions of the SN, the pigmeted zone (zona compacta) and the non-pigmented zone (zona reticulata) were delineated, and these zones were partitioned into quarters: medial, mid-medial, mid-lateral and lateral. Neuronal loss was fairly severe and more evident in the upper section of the SN (−40%), especially in the midmedial and lateral quarters. In the lower section (neuronal loss:−28%), the medial quarter was most severely affected. Non-pigmented neurons were preserved. Fibrillary gliosis was denser in the zona reticulata, where neuronal loss was minimal. These findings revealed a selective vulnerability of nigral neurons according to their topography and pigmentation and suggests the primary involvement of some neuronal groups (especially the pigmented neurons) of the SN in Pick's disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334504
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of the structure factors of diamond (1990)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 514-517 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The absolute values of the structure factors of diamond are determined for nine low-order reflections by measuring the X-ray Pendellösung beats on the wavelength scale. Parallel-sided wafers of synthetic diamond single crystals are used for specimens. The deformation charge density and the Debye-Waller B factor are evaluated from the structure factors. The charge density of pile-up electrons is estimated to be 0.44(17) eÅ-3 at the midpoint between the nearest-neighbour atoms. The density is slightly smaller than that determined by the powder diffraction method. The obtained B factor, 0.142 (9) Å2, is in good agreement with that evaluated to date from neutron diffraction measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767390002197
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  • 4
    Electronic Resource
    Electronic Resource
    Mauritius type black rats with peculiar karyotypes derived from robertsonian fission of small metacentrics (1979)
    Springer
    Chromosoma 75 (1979), S. 51-62 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract All seventeen black rats collected from Mauritius Island were characterized by having many extra small acrocentric autosomes. Their basic karyotype was of Oceanian type, because of the presence of the large metacentric M1 and M2 pairs, but chromosome numbers in 13 specimens among them were 42, those of 3 specimens 43, and those of the remaining one specimen 44. Although the Oceanian type rat had 2 small acrocentric autosomes (pair no. 13), 16 Mauritius rats had 10 small acrocentrics, and the remaining one had 8 small acrocentrics. Comparative karyotype analysis between Oceanian and Mauritius type rats showed that the extra small acrocentrics found in Mauritius rats were due to Robertsonian fission of small metacentric pairs no. 14 and 18 of the original Oceanian type rat. Only one rat with 8 small acrocentrics showed the heteromorphic pair no. 18 consisting of one metacentric and two acrocentrics. The large metacentric M1 chromosome in 13 of 17 rats examined showed homologous pair, but two of them were heteromorphic by involving one metacentric M1 and two acrocentrics. In the remaining two rats M1 chromosome was not observed, but acrocentric pairs no. 4 and 7 were included. These acrocentrics were also suggested to be originated from Robertsonian fission of the large metacentric M1 chromosome. Robertsonian fission seemed to be one of the important mechanism found in karyotype evolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330624
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  • 5
    Electronic Resource
    Electronic Resource
    Vitamin E deficiency in acquired fat malabsorption (1990)
    Springer
    Journal of neurology 237 (1990), S. 103-106 
    Details
    ISSN: 1432-1459
    Keywords: Vitamin E deficiency ; Fat malabsorption ; Diabetes mellitus ; Chronic pancreatitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thirteen patients with adult-onset vitamin E deficiency due to fat malabsorption were investigated clinically and electrophysiologically. These patients had slightly or moderately decreased serum vitamin E (1.7–4.8 μg/ml, normal 〈6.0) or vitamin E/cholesterol ratio (0.21–0.31 mg/g, normal 〈0.35). Only one patient had typical neurological manifestations of vitamin E deficiency, which improved with supplementary vitamin E. The pathological findings in this patient were also compatible with vitamin E deficiency. This patient had poorly controlled diabetes mellitus due to advanced chronic pancreatitis. Reviewing previously reported cases of vitamin E deficiency with diabetes mellitus in chronic pancreatitis, the duration of deficiency until the onset of symptoms was shorter than in those cases without complications. Although adult patients with early, slight deficiency of vitamin E are generally asymptomatic, patients with diabetes mellitus tend to have early neurological symptoms. The vitamin E tolerance test should be used, because even in some patients with vitamin E deficiency due to malabsorption, the deficiency can be overcome by large oral doses of vitamin E.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314671
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  • 6
    Electronic Resource
    Electronic Resource
    Contrast-enhanced magnetic resonance imaging of sub- and epidural empyemas (1992)
    Springer
    Neuroradiology 34 (1992), S. 494-496 
    Details
    ISSN: 1432-1920
    Keywords: Subdural empyema-Epidural empyema ; Gadopentetate dimeglumine ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Contrast-enhanced magnetic resonance images (MRI) of three patients with subdural (SDE) and two with epidural empyemas (EDE) were reviewed. In each case, the capsule of the lesion demonstrated enhancement, and distinction between capsule and contents was obvious on contrast-enhanced images. In SDE, contrast-enhanced images clearly depicted thickening of the neighbouring dura mater and a co-existent brain abscess. In EDE, part of the displaced dura mater did not enhance, which facilitated differentiation from SDE. Contrast-enhanced MRI was thus of value in diagnosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00598958
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  • 7
    Electronic Resource
    Electronic Resource
    MRI appearances of calcified regions within intracranial tumours (1993)
    Springer
    Neuroradiology 35 (1993), S. 341-344 
    Details
    ISSN: 1432-1920
    Keywords: Brain tumour ; Calcification ; Magnetic resonance imaging ; Gadopentetate dimeglumine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The MRI appearances of calcification within intracranial tumours was assessed by reviewing MR images of 11 calcified tumours documented by CT. The signal intensity of the calcified regions was varied and nonspecific on both T1-and T2-weighted images. They were seen as signal void exclusively on T2-weighted images in only 2 patients. Gadolinium enhancement of the calcified portion occurred in 7 of 10 patients. These findings reflect the presence of tumour parenchyma within the calcified region, as proved in 5 lesions examined histologically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588364
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  • 8
    Electronic Resource
    Electronic Resource
    Moyamoya disease: diagnosis with three-dimensional CT angiography (1994)
    Springer
    Neuroradiology 36 (1994), S. 432-434 
    Details
    ISSN: 1432-1920
    Keywords: Moyamoya disease ; Computed tomography ; Three-dimensional imaging ; Angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our purpose was to assess the value of threedimensional (3D) CT angiography in the diagnosis of moyamoya disease. We studied seven patients with moyamoya disease proved by conventional angiography. Three-dimensional (3D) CT angiography was performed using rapid sequence or helical (spiral) scanning in conjunction with a bolus injection of intravenous contrast medium. All seven patients could be diagnosed as having moyamoya disease on the basis of the following 3D CT angiographic findings: poor visualisation of the main trunks and/or major branches of anterior and middle cerebral arteries (7 patients); dilated leptomeningeal anastomotic channels from the posterior cerebral arteries (4); and demonstration of “moyamoya vessels” in the basal ganglia (2). Although conventional angiography remains the principal imaging technique for demonstrating anatomical changes in detail, less invasive 3D CT angiography provides a solid means of diagnosing moyamoya disease when it is suspected on CT, MRI, or clinical grounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00593677
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  • 9
    Electronic Resource
    Electronic Resource
    Thermally-induced cutaneous sympathetic activity related to blood flow through capillaries and arteriovenous anastomoses (1978)
    Springer
    Pflügers Archiv 375 (1978), S. 17-24 
    Details
    ISSN: 1432-2013
    Keywords: Skin blood flow ; Skin sympathetic activity ; Autonomic nervous system ; Thermoregulation ; Arteriovenous anastomoses ; Microspheres
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the ears of anaesthetized rabbits cutaneous efferent sympathetic nerve activity (SkNA) and blood flow ( $$\dot Q$$ ) to capillaries have been measured during various thermal treatments. Warming the spinal cord or skin of the body midside caused a marked decrease in SkNA but capillary $$\dot Q$$ increased only slightly. Exposure to a warm environment or localized warming of the ear alone induced either a decrease, an increase, or no change in SkNA, but capillary $$\dot Q$$ always increased markedly. The usual slight increase in capillary $$\dot Q$$ during spinal warming, was abolished by preventing the usual marked increase in skin temperature. When the spinal cord of the conscious rat was warmed, a marked increase in temperature of the tail (which contains arteriovenous anastomoses, AVA's) indicated dilatation, whereas there was no change in ear temperature (where there are no AVA's). When these results are considered together with recently defined differential influences of reflex and direct effects of temperature on blood flow through cutaneous AVA's and capillaries, it is concluded: (1) That thermally-induced reflex changes in skin blood flow are mediated via sympathetic nervous action on AVA's; (2) Changes in blood flow evoked by direct heating take place through the capillaries, not the AVA's, quite independently of SkNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00584143
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of high tibial osteotomy on osteoarthritis of the knee (1979)
    Springer
    International orthopaedics 3 (1979), S. 37-45 
    Details
    ISSN: 1432-5195
    Keywords: Knee ; Osteoarthritis ; Tibial osteotomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une ostéotomie de l'extrémité supérieure du tibia a été réalisée chez 125 malades (136 genoux) porteurs d'une arthrose sur genu varum. Avant l'intervention, tous les sujets se plaignaient de douleurs plus ou moins importantes et présentaient une augmentation de la déformation lors de l'appui. Le recul est de 1 à 5 ans. Une diminution notable des douleurs a été obtenue sur 112 genoux et 122 malades sont satisfaits de l'intervention. Les genoux stables et indolores ne présentent plus de bâillement externe et ont été en majorité corrigés de façon satisfaisante, avec un angle fémoro-tibial compris entre 165° et 174°. Sur les 28 genoux comportant un angle de 175° à 179° un an après l'opération, 4 ont donné lieu à une récidive du varus trois ans après l'ostéotomie. La mobilité pré-opératoire a été conservée, même dans les cas où une arthrotomie a été associée à l'ostéotomie. Un bilan intraarticulaire, effectué chez 2 malades, plusieurs années après l'ostéotomie, a montré que les parties les plus détruites de la surface articulaire étaient complétement recouvertes d'un tissu fibro-cartilagineux. L'ostéotomie tibiale est efficace dans l'arthrose sur genu varum, surtout si la correction réalise un angle fémoro-tibial de 170°, soit 10° de valgus.
    Notes: Summary High tibial osteotomies were performed on 136 osteoarthritic knees for correction of varus deformity. Before osteotomy all patients experienced moderate or severe pain, and the knees showed lateral thrust on weight-bearing. The patients were followed up for one to five years. Marked relief of pain was obtained in 112 knees, and the patients were satisfied with the result of operation in 122. These painless knees showed no lateral thrust, and in the majority the deformity had been adequately corrected, with post-operative femoro-tibial angles (standing) ranging from 165° to 174°. Four of 28 knees with femoro-tibial angles of 175° to 179°, when measured one year after operation, showed recurrence of varus deformity three years after osteotomy. Preoperative ranges of knee motion were well maintained after osteotomy even when arthrotomy had also been undertaken. Intra-articular assessment in two patients, several years after operation, showed that the most degenerated portions of the articular surface were completely covered by a fibrocartilagenous layer, with no bare bone. High tibial osteotomy is most effective in osteoarthritic knees with varus deformity, when correction is made to a femoro-tibial angle (standing) of 170° (10° valgus).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266324
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