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  • Articles: DFG German National Licenses  (12)
  • 1990-1994  (12)
  • 1955-1959
  • 1992  (6)
  • 1990  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Juvenile colloid milium: clinical, histological and ultrastructural features (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cutaneous pathology 19 (1992), S. 0 
    Details
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We report the clinical, histological and ultrastructural features of juvenile colloid milium affecting a brother and sister. In this rare condition, translucent papules develop on sun-exposed areas of skin, with onset in childhood. Histologically and ultrastructurally, the papules consist of amyloid-like material derived from epidermal keratonocytes. A review of the literature suggests a possible genetic abnormality that leads to sun-induced degeneration of keratinocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0560.1992.tb00617.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    New aspects of electron transfer on semiconductor surface: dye-sensitization system (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 3040-3045 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100370a056
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Growth-inhibitory effects of 1,25-dihydroxyvitamin D3 on normal and psoriatic keratinocytes (1990)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 123 (1990), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The effects of 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) on the growth and DNA synthesis of cultured human keratinocytes obtained from involved and uninvolved psoriatic epidermis and normal epidermis were studied. Treatment with 10-8m and 10-7m of 1,25(OH)2D3 inhibited cell growth as follows: 58.5±19.3% and 21.3±13.6% in normal keratinocytes (n=6); 43.8±22.8% and 17.8±12.3% in psoriatic uninvolved keratinocytes (n=4); 51.7±18.2% and 13.2±6.4% in psoriatic involved keratinocytes (n=6). Inhibition was virtually complete at 10-6m. DNA synthesis was also inhibited by 10-8m, 10-7m and 10-6m of 1,25(OH)2D3 as follows: 70.0±8.3%, 59.0±6.8% and 16.7±4.0%, respectively, in normal keratinocytes (n=3); 78.5±13.5%, 51.5±25.5% and 24.5±21.5%, respectively, in psoriatic uninvolved keratinocytes (n=2); and 69.3±14.5%, 41.3±19.1% and 14.8±11.2%, respectively, in psoriatic involved keratinocytes (n=4). These results indicate that 1,25(OH)2D3 functions as a growth inhibitor for cultured human keratinocytes derived from both normal and psoriatic skin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1990.tb01828.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Photochromism induced in an electrolytically pretreated Mo03 thin film by visible light (1992)
    [s.l.] : Nature Publishing Group
    Nature 355 (1992), S. 624-626 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The MoO3 amorphous film was prepared by vacuum evaporation of high-purity MoO3 powders (99.9%) onto a l-mm-thick NESA glass substrate (5 x 2.5 cm), with a typical film thickness of -l,OOOnm being obtained. Photochromic experiments were done in air, and a 500-W high-pressure mercury lamp was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/355624a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Photoelectrochemical information storage using an azobenzene derivative (1990)
    [s.l.] : Nature Publishing Group
    Nature 347 (1990), S. 658-660 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Two types of reversible processes, photochemical cis-trans isomerization (see, for example, ref. 3) and electrochemical oxidation-reduction4, are available in an azobenzene system.FIG. 1 Cyclic voltammograms of trans (dashed line) and cis (solid line) ABD monolayer films on a Sn02 glass electrode. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/347658a0
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Recurrent low-grade glioma in children with special reference to computed tomography findings and pathological changes (1990)
    Springer
    Child's nervous system 6 (1990), S. 155-160 
    Details
    ISSN: 1433-0350
    Keywords: Recurrence ; Low-grade glioma ; Children ; Malignant transformation ; Computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Recurrent low-grade gliomas in children were studied with special reference to correlation between the computed tomography (CT) scan and pathological findings at recurrence. During the past 16 years (1970–1986) 105 cases of primary pediatric brain tumors were treated in our hospital. Seventeen of these had low-grade glioma, seven of which (five astrocytomas, one ependymoma, and one subependymoma) had recurrence of tumor by the end of 1987. The enhanced CT findings were classified into three types — cystic, false cystic, and solid, according to Lapras' classification. The pathological findings of recurrent tumors were reviewed with particular attention to malignant transformation. The results showed that in two out of three cases where CT findings had changed from initial cystic to solid type at recurrence malignant transformation was revealed. Enhanced CT scan was also useful for detecting small asymptomatic recurrent tumors in children. On the other hand, surgical procedures and adjuvant therapies demonstrated no significant relationship with recurrence. It is suggested that the recurrence of low-grade glioma in children is not rare, and that changes in findings on contrast enhanced CT might reflect malignant transformation in a recurrent tumor, necessitating a careful follow-up.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308493
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The spinnability of viscoelastic solutions of tetradecyl- and hexadecyl-trimethylammonium salicylates (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 460-468 
    Details
    ISSN: 1435-1536
    Keywords: Spinnability ; viscoelasticsurfactantsolution ; tetradecyltrimethylammoniumsalicylate ; hexadecyltrimethylammonium salicylate ; rodlikemicelle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The spinnability was measured for aqueous viscoelastic solutions of tetradecyl- and hexadecyltrimethylammonium salicylates (C14TASal, C16TASal) in the absence and presence of sodium salicylate (NaSal) and sodium bromide (NaBr). The spinnability is classified into two types, D and C. While the intrinsic drawing length in type D is proportional to the drawing velocity, the drawing intrinsic length in type C decreases with the drawing velocity or is independent of it. The spinnability changes from type D to C, as the drawing velocity and the surfactant concentration increase, and the temperature lowers. The effect of salt is different between NaSal and NaBr. It can be assumed that a pseudo-network structure composed of rod-like micelles is formed in viscoelastic and spinnable surfactant solutions. Then, the spinnability depends on the balance between the elasticity and the viscosity in which the structure results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411005
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  • 8
    Electronic Resource
    Electronic Resource
    The viscoelasticity of spinnable solutions of alkyltrimethylammonium salicylates (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 249-258 
    Details
    ISSN: 1435-1536
    Keywords: Viscoelasticity ; spinnability ; tetradecyltrimethylammoniumsalicylate ; hexadecyltrimethylammoniumsalicylate ; rodlikemicelle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The viscoelasticity has been measured for aqueous solutions of tetradecyl-and hexadecyltrimethylammonium salicylates (C14TASal, C16TASal). The aqueous solutions of C14TASal without salt displayed the gel-like behavior at 10.0×10−2 g cm−3, but those more dilute than 3.2×10−2 g cm−3 presented the viscoelasticity similar to that of a Maxwell liquid. The Maxwell-like behavior was converted to the polymer-like one on the addition of (0.1–0.2) M NaBr or (0.02–0.2) M NaSal. The gel-like viscoelasticity can be connected with the spinnability of “cohesive fracture failure”, and the Maxwell-like and polymer-like viscoelasticities are concerned with the spinnability of “ductile failure”. The gel-like and Maxwell-like viscoelasticities originate in the pseudo-network formed by the pseudo-linkages between rodlike micelles, while the polymer-like viscoelasticity is caused by the entanglement of long rodlike micelles in semidilute and concentrated solutions. The aqueous solutions of C16TASal behaved very similar to those of C14TASal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655477
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of the thermal conductivity of xenon-helium mixtures at high temperatures by the shock-tube method (1992)
    Springer
    International journal of thermophysics 13 (1992), S. 211-221 
    Details
    ISSN: 1572-9567
    Keywords: corresponding states ; high temperatures ; mixing rule ; shock-tube method ; thermal conductivity ; xenon-helium mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity of gases at high temperatures has been measured by the shock-tube method, which is uniquely suited to measure thermal conductivities of gases at high temperatures above 2000 K. A consistent set of thermal-conductivity data over a wide range of temperatures has been obtained from optimum combinations of shock-tube experiments at high temperatures, previously published data at lower temperatures, and a theoretical correlation of the temperature dependence. In the present study, the thermal conductivity of xenon-helium mixtures has been determined at compositions of 10 and 30 mol% xenon over the temperature range from 300 to 4800 K. Even though there is a large difference between the thermal conductivity of pure xenon and that of helium, it is interesting that the dependences of the thermal conductivity of the mixture on temperature and composition are linear. The experimental results are in good agreement with the predicted values based on the corresponding-states principle and the mixing rule. From these experimental results, interpolating the corresponding-states correlation data, we represent the equation of xenon-helium gas mixtures for thermal conductivity in terms of temperature and composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504432
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  • 10
    Electronic Resource
    Electronic Resource
    Amorphous nickel-valve metal-platinum group metal alloy electrodes for hydrogen-oxygen sulphuric acid fuel cells (1992)
    Springer
    Journal of applied electrochemistry 22 (1992), S. 1017-1024 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Powder catalysts were prepared by immersion of amorphous Ni-40Zr and Ni-40Ti alloys containing a few at % of platinum group elements in HF solution. This treatment led to preferential dissolution of the valve metal and nickel with a consequent formation of microcrystalline alloy powders consisting of concentrated platinum group elements and some nickel and valve metal. Porous gas-diffusion electrodes prepared by using these alloy catalyst powders were employed for electrochemical reduction of oxygen and oxidation of hydrogen in 1 M H2SO4 at 25°C. The activity of the electrodes prepared from the amorphous alloys containing Pt−Ru, Pt−Rh, Pt and Pd for oxygen reduction was considerably higher than that of the platinum black electrode. Oxidation of hydrogen occurred readily close to the equilibrium potential. Amorphous alloy electrodes containing Pt−Ru, Pt−Rh and Pt were more active than the platinum black electrode for the hydrogen oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029579
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