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  • 1
    Electronic Resource
    Electronic Resource
    Effect of cyclospasmol on early diabetic retinopathy (1987)
    Springer
    International ophthalmology 10 (1987), S. 3-9 
    Details
    ISSN: 1573-2630
    Keywords: cyclospasmol ; cyclandelate ; diabetic retinopathy ; quantitative vitreous fluorophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A randomized, double-blind, placebo controlled study to investigate the long-term effect of CyclospasmolR (cyclandelate) on the abnormal permeability of the blood-retinal barrier was performed in 26 patients with insulin-dependent diabetes mellitus for at least 1 year and minimal retinopathy. Cyclospasmol 400 mg or placebo capsules were taken 4 times daily for 12 months by equal numbers in both groups. Each patient underwent a routine ophthalmoscopic examination, retinal fluorescein angiography and quantitative vitreous fluorophotometry to assess the permeability of the blood-retinal barrier just before the trial and following 6 and 12 months of therapy. Laboratory tests for determining blood and urine glucose levels and blood HbA1-levels were also carried out at these assessments. Statistically significant changes in diabetic control, in HbA1-levels or in the frequency of retinal microaneurysms could not be shown in either treatment group during the trial, nor were there any significant differences in these parameters between the two groups. Analysis of fluorophotometric data on fluorescein penetration into the left posterior vitreous demonstrated significant reductions in this parameter during the trial compared to the pretreatment level in Cyclospasmol treated diabetics. These changes in the pretreatment level after 6 and 12 months also differed significantly between the two groups. However, this statistically significant beneficial reduction in fluorescein penetration into the left posterior vitreous did not occur in the right eye in the Cyclospasmol group. In placebo treated patients a consistently deleterious trend for this parameter was observed for both eyes during the one year study. The consistently beneficial trend in the right eye following Cyclospasmol and the consistently deleterious trend in both eyes following placebo with regard to the abnormal permeability of the blood-retinal barrier of diabetics with minimal retinopathy could probably be explained by the small number of patients in both groups. No side-effects were reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202775
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of calcium dobesilate on the blood-retinal barrier in early diabetic retinopathy (1990)
    Springer
    International ophthalmology 14 (1990), S. 81-88 
    Details
    ISSN: 1573-2630
    Keywords: calcium dobesilate ; diabetic retinopathy ; blood-retinal barrier ; vitreous fluorophotometry ; penetration ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of calcium dobesilate on the alteration of the blood-retinal barrier was studied in 41 adult-onset, non-insulin dependent diabetic patients with minimal or no retinopathy, randomly assigned to receive either oral calcium dobesilate (1000 mg twice daily) or a placebo for 12 months. The posterior vitreous value and the penetration ratio, determined by vitreous fluorophotometry, reflected stabilisation of blood-retinal barrier permeability in the calcium dobesilate patients and deterioration of blood retinal barrier in those given placebo. During the relatively short period of the study, one year, no significant change in microaneurysm and capillary closure gradings was observed. No side effects were associated with calcium dobesilate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154206
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    An ab initio study of oxygen vacancies and doping process of Nb and Cr atoms on TiO2 (110) surface models (1997)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 65 (1997), S. 625-631 
    Details
    ISSN: 0020-7608
    Keywords: ab initio ; oxygen vacancy ; doping ; titanium oxide surface ; varistor ceramics ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We theoretically investigated how the formation of oxygen vacancies and the addition of niobium and chromium atoms as dopants modify the varistor properties of TiO2. The calculations were carried out at the HF level using a contracted basis set, developed by Huzinaga et al., to represent the atomic centers on the (110) surface for the large (TiO2)15 cluster model. The change of the values for the net atomic charges and band gap after oxygen vacancy formation and the presence of dopants in the lattice are analyzed and discussed. It is shown that the formation of oxygen vacancies decreases the band gap while an opposite effect is found when dopants are located in the reduced surface. The theoretical results are compared with available experimental data. A plausible explanation of the varistor behavior of this system is proposed.   © 1997 John Wiley & Sons, Inc. Int J Quant Chem 65: 625-631, 1997
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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