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  • 1
    Digitale Medien
    Digitale Medien
    Giant magnetoresistance effects in UNiGa : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5794-5796 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Magnetic transitions in UNiGa were found to cause pronounced anomalies in temperature and magnetic-field dependencies of the electrical resistivity. The resistivity values are drastically reduced by the field induced transition from an antiferromagnetic to a ferromagnetic phase. The giant magnetoresistance (as large as Δρ/ρ=−87% at T=1.2 K for i(parallel)c) observed in UNiGa is typical for materials characterized by a strong coupling of conduction electrons with highly correlated f electrons. The observed anisotropy of transport properties is closely connected with the strong uniaxial magnetic anisotropy of this compound.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350163
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  • 2
    Digitale Medien
    Digitale Medien
    Observation of stripe-direction dependence of threshold current density for AlGaInP laser diodes with CuPt-type natural superlattice in Ga0.5In0.5P active layer (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 737-739 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An anisotropy for threshold current densities for AlGaInP laser diodes with CuPt-type natural superlattice (NSL) in a Ga0.5In0.5P active layer, grown on a (001) GaAs substrate, was observed, for the first time. Threshold current densities (Jth) for laser diodes with stripes in the [1¯10] and [110] direction were 1.35 and 2.10 kA/cm2, respectively. The lasers with a weak NSL formation in the active layer showed a very small anisotropy in Jth. Stripe direction dependence of electroluminescence (EL) polarization properties were also observed for lasers with well-developed NSL. The anisotropies in Jth and EL polarization properties are attributed to the existence of the NSL in the active layer and the appearance asymmetry previously observed in the NSL.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.107782
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  • 3
    Digitale Medien
    Digitale Medien
    Comparison of giant magnetoresistance in multilayer systems and uranium compounds : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6522-6524 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The enormous magnetoresistance effect at low temperatures in various uranium-based intermetallic compounds, which exceeds by far the effect found in magnetic-multilayer systems, is a consequence of the strong 5f conduction electron hybridization. The consequences of spin-dependent scattering for the giant magnetoresistance (GMR) effect in uranium intermetallics will be discussed and compared with the behavior in multilayer systems. Possible changes of the model parameters to achieve giant magnetoresistance (GMR) effects at higher temperatures, which are desirable for practical applications, are considered.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.356935
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  • 4
    Digitale Medien
    Digitale Medien
    Development of serum Dermatophagoides farinae-, ovalbumin- and lactalbumin-specific IgG, IgG1, IgG4, IgA and IgM in children with bronchial asthma/allergic rhinitis or atopic dermatitis (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 20 (1990), S. 0 
    Details
    ISSN: 1365-2222
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Dermatophagoides farinae-, ovalbumin-and lactalbumin-specific IgG, IgG1, IgG4, IgA and IgM were evaluated in 161 healthy children [Group 1], 84 children with bronchial asthma and/or allergic rhinitis but without atopic dermatitis [Group 2], and 54 children with atopic dermatitis but without bronchial asthma and allergic rhinitis [Group 3]. We also studied D. farinae-, egg-white-, and milk-specific IgE of children with allergic diseases. D. farinae-specific IgG, IgG1, IgG4 and IgA in Groups 2 and 3 increased until 5 years of age and thereafter they remained constant. After 2 years of age, D. farinae-specific IgG, IgG1, IgG4 and IgA in Group 2 were higher than those in Groups 1 and 3. Ovalbumin- and lactalbumin-specific IgG, FgG1, IgG4 and IgA in Groups 2 and 3 increased until 1 year of age and thereafter decreased. Until 1 year of age, ovalbumin- and lactalbumin-specific IgG, IgG1, and IgG4 in Groups 3 were higher than those in Groups 1 and 2. D. farinae-, ovalbumin- and lactalbumin-specilic IgM were constant in all ages of all groups. These results suggest that atopic dermatitis in young children is related to food-specific immunoglobulins and that respiratory allergic diseases in older children is related to D. farinae-specific immunoglobulins.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2222.1990.tb02773.x
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  • 5
    Digitale Medien
    Digitale Medien
    Infection by Porphyromonas gingivalis and Actinobacillus actinomycetemcomitans, and antibody responses at different ages in humans (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 29 (1994), S. 0 
    Details
    ISSN: 1600-0765
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: This study examined the serum IgG and IgM responses against Porphyromonas gingivalis and 3 serotypes of Actinobacillus actinomycetemcomitans, and the correlations of these responses with age and homologous infection. A total of 90 individuals were included in this study: 40 subjects with gingivitis, 40 periodontally healthy subjects, and 10 adult periodontitis subjects. The subjects in the gingivitis and periodontally healthy groups were divided into 4 stages based on their physiological age: early childhood, school age, puberty, and adult. In the gingivitis group, there was a positive correlation between increase in age and increase in serum IgG antibody levels against P. gingivalis until puberty. However, no statistically significant difference was found between the puberty stage and the adult stage. The average level of IgG antibodies against A. actinomycetemcomitans in the school age gingivitis group was significantly higher than that in the early childhood gingivitis group for all serotypes (p 〈 0.01). In serotype c, IgG antibody levels in the school age gingivitis group were significantly higher than in the early childhood gingivitis group or the adult gingivitis group (p 〈 0.01). With both P. gingivalis and A. actinomycetemcomitans, positive correlations between elevated IgG level and infections by these microorganisms were found in the puberty gingivitis and adult periodontitis groups.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0765.1994.tb01085.x
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  • 6
    Digitale Medien
    Digitale Medien
    The temporomandibular joint in rheumatoid arthritis—a comparative clinical and tomographic study pre- and post-prosthesis (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 17 (1990), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Six partially or fully edentulous rheumatoid patients participated in the study. By comparing the clinical symptoms and tomograms of the temporomandibular joints (TMJS) pre-prosthesis with those post-prosthesis, this report assesses whether dental treatment could provide positive help for TMJS in patients with rheumatoid arthritis (RA).Among the clinical symptoms of TMJ dysfunction, pain from the TMJ region and limitations of movement were improved in all the patients post-prosthesis. Tomographic evidence of desirable remodelling of the condylar heads was observed in two cases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2842.1990.tb01406.x
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  • 7
    Digitale Medien
    Digitale Medien
    The prevalence of sensitivity to constituents of dental alloys (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 17 (1990), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Ninety-five participants were epicutaneous patch tested in order to determine the prevalence of sensitivity to components of dental alloys. Seventeen individuals (17.9%) developed allergic reactions, which were caused by mercury (10.5%), copper (2.1%), nickel, cobalt, tin, gold and zinc (1.1%). Eight of 17 allergic responders had a history of dermatitis from metal contact. The results show that there is a need for careful immunological considerations during the selection of suitable alloys, particularly in the case of patients with lesions suspected of being caused by dental alloys.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2842.1990.tb00022.x
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  • 8
    Digitale Medien
    Digitale Medien
    Clinicopathological studies of anomalous arrangement of the pancreaticobiliary ductal system with pancreas divisum (1994)
    Springer
    Journal of hepato-biliary-pancreatic surgery 1 (1994), S. 240-246 
    Details
    ISSN: 1436-0691
    Schlagwort(e): anomalous arrangement of the pancreaticobiliary ductal system ; pancreas divisum ; acute pancreatitis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We examined the morphological aspects of the pancreaticobiliary ductal system in 13 patients with both anomalous arrangement of the pancreaticobiliary ductal system (AAPB) and associated pancreas divisum (PD), and compared their clinicopathological findings with those of patients with either AAPB or PD alone. PD is classified into three types, i.e., separate pancreas, nonfusion of the ventral and dorsal pancreatic ducts, and partial fusion of the ventral and dorsal pancreatic ducts. Of the 13 patients with AAPB and associated PD, 5 were male and 8 female; their mean age was 57 years. Nine of the 13 had clinical symptoms. Five of the 13 had gallbladder cancer, 3 had cholecystolithiasis, and 2 choledochal cyst. One patient showed nonfusion of both pancreatic ducts and the others showed partial fusion of the ducts. The length of the common duct from the orifice of the papilla of Vater to the junction of the common bile duct with the ventral pancreatic duct and the location of the union varied. The presence of both AAPB and PD made the arrangement of the pancreaticobiliary ducts very complicated. Clinical aspects were similar to those of AAPB and the patients were likely to be treated for a condition other than PD. However, since relapsing acute pancreatitis and intermittent epigastric pain are typical symptoms in patients with AAPB as well as in those with PD, we should carefully follow up those patients with both AAPB and PD.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02391074
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  • 9
    Digitale Medien
    Digitale Medien
    Osteoclast-like giant cell tumour of the gallbladder (1992)
    Springer
    Virchows Archiv 420 (1992), S. 359-366 
    Details
    ISSN: 1432-2307
    Schlagwort(e): Gallbladder ; Osteoclast-like giant cell tumour ; Vimentin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary We describe a rare carcinoma of the gallbladder containing osteoclast-like giant cells. Well-differentiated adenocarcinoma was found in the mucosa of the fundus, and osteoclast-like giant cells were present mainly in a haemorrhagic mass protruding from the mucosal surface. The metastatic hepatic tumour was composed chiefly, if not exclusively, of osteoclastoma-like cells, but minute carcinomatous elements were also present. There was an apparent transition between the giant cells and tubular structures in both the gallbladder tumour and hepatic tumour. However, ultrastructural study did not reveal any evidence of epithelial differentiation in the giant cells. Immunohistochemical studies suggested that the mononuclear and giant cells were mesenchymal and histiocytic in nature (vimentin and factor XIII a positive). A few exceptional giant cells transforming from the fine tubular structure were positive for epithelial membrane antigen. In conclusion, the osteoclast-like giant cell tumour component was thought to represent mesenchymal metaplasia in pre-existent adenocarcinoma.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600216
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  • 10
    Digitale Medien
    Digitale Medien
    The proportions of fiber types in human external urethral sphincter: electrophoretic analysis of myosin (1990)
    Springer
    Urological research 18 (1990), S. 341-344 
    Details
    ISSN: 1434-0879
    Schlagwort(e): External urethral sphincter ; Myosin ; Electrophoresis ; Male ; Human
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The proportions of fast and slow myosin molecules in external urethral sphincter specimens from ten urodynamically normal male bladder carcinoma patients were estimated from the contents of fast and slow myosin light chains in two-dimensional electrophoretic gels. The percentages of fast and slow myosin molecules ranged from 5.0% to 61.4% with a mean of 35.5% and from 38.6% to 95.0% with a mean of 65.5% respectively. It is therefore concluded that the human external urethral sphincter is composed of both fast and slow muscle fibers as well as other voluntary muscles. The human external urethral sphincter is considered to be a highly fatigue-resistant muscle with a very high proportion of slow muscle fibers. In the cases studied so far, there is a great diversity in the proportions of fast and slow myosin molecules; the reason for this remains unknown.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00300784
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