 
         
         
         Zusammenfassung
         
         Die dynamische Lichtstreuung (DLS) (quasielastische Lichtstreuung, Photon Korrelationsspektroskopie)
            misst die Brown’sche Bewegung von Makromolekülen (MM). Kleine MM bewegen sich schnell,
            große langsam. DLS misst die mit diesen Bewegungen verknüpften Lichtemissionen. Daraus
            lässt sich mit einigen Zusatzannahmen die Relaxation dieser MM-Bewegungen berechnen
            sowie die hydrodynamischen Diffusionskoeffizienten solcher MM in kolloidaler Lösung.
            Zahlreiche pathologische Störungen im Bereich der transparenten Medien des Auges,
            aber auch allgemeine Krankheiten, wie die Alzheimersche Krankheit, die Atherosklerose
            sowie andere Alterskrankheiten können durch eine abnorme Verklumpung (Kondensation,
            Agglutination) von MM erklärt werden. Medikamente, wie das Panthetine, wirken auf
            die Ionenstärke solcher MM und können Verklumpungen verhindern. Sie sind im Tierversuch
            hochwirksam und es besteht die Hoffnung, dass solche Medikamente auch beim Menschen
            wirksam werden dürften. Statische Lichtstreuung (SLS) (Tyndallometrie, Nephelometrie)
            kann das Gewicht von Streupartikeln messen aber nicht, wie die DLS, die Größe von
            MM.
         
         
         
         Abstract
         
         Dynamic light scattering (DLS) measures the oscillations of macromolecules (MM) (Brownian
            motion). Small MM move fast, large MM slowly. DLS allows one to measure the relaxation
            of the movements of these MM, together with their sizes and their hydrodynamic diffusion
            coefficients. By DLS not only the pathogenesis of a large number of eye diseases but
            also those of general diseases may be determined. The origin of this class of diseases
            is the condensation (agglutination) of MM. Medicaments, such as Panthetine, have been
            shown to be effective in animal experiments by acting on the ionic strength of disturbed
            MM. They may have a fair chance to be effective also in humans. Static light scattering
            (tyndallometry, nephelometry) (SLS) is able to determine the weight of MM, but however
            their shape, as DLS can.
         
         
         
            
Schlüsselwörter
         
         
            Dynamische Lichtstreuung - Quasielastische Lichtstreuung - Photonen Korrelationsspektroskopie
          
         
            
Key words
         
         
            dynamic light scattering - quasi-elastic light scattering - photon correlation spectroscopy
          
      
    
   
      
         Literatur
         
         
            - 1 Chu B. Laser Scattering: Basic Principles and Practice. New York; Academic Press
               1991 
- 2 
               Tanaka T, Benedek G B. 
               Observation of protein diffusivity in intact human and bovine lenses with application
               to cataract. 
               Invest Ophthalmol Vis Sci. 
               1975; 
               14 
               449-456 
               
- 3 Bursell S E, Magnante P C, Chylack L T. In vivo uses of quasi-elastic scattering
               spectroscopy as a molecular probe in the anterior segment of the eye. B. R. Masters
               Noninvasive Diagnostic Technics in Ophthalmology New York; Springer Verlag 1990: 342-365
               
- 4 Rovati L, Pollonini L, Ansari R. Design and performance of an ophthalmic instrument
               for dynamic light scattering and fluoresence measurements in ocular tissue. Instrumentation
               Technology Conference. Proceedings of the 21st IEEE IMTC 04 2004 
- 5 
               Rovati L, Fankhauser II F, Ricka J. 
               Design and performance of a new ophthalmic instrument for dynamic light scattering
               in the human eye. 
               Rev Sci Instrum. 
               1996; 
               67 
               2615-2620 
               
- 6 
               Fankhauser II F. 
               The role of dynamic light scattering in the assessment of molecular alterations associated
               with photo-astigmatic refractive keratectomy. 
               2007: in press; 
               
- 7 
               Krüger R. 
               non published results. 
               
- 8 
               Pollonini L, Pasquali A, Rovati L. et al .
               Pigment dispersion syndrome (PDS) assessment by dynamic light scattering. 
               Ophthalmic Technologies XIII, Proceedings SPIE. 
               2003; 
               SPIE 5149 
               1605-7422 
               
- 9 
               Benedek G B. 
               Cataract as a Protein Condensation Disease. 
               Invest Ophthal Vis Sci. 
               1997; 
               38 
               1911-1921 
               
- 10 
               Murphey R M. 
               Static and dynamic light scattering of biological macromolecules: what can we learn?. 
               Current Opinion in Biotechnology. 
               1997; 
               8 
               25-30 
               
- 11 
               Küchle M, Ho T S, Nguyen N X. et al .
               Protein quantification and electrophoresis in aqueous humor of pseudoexfoliation eye. 
               Invest Ophthalmol Vis Sci. 
               1994; 
               35 
               748-752 
               
- 12 
               Küchle M, Nguyen N X, Horn F. et al .
               Quantitative assessment of aqueous flare and aqueous ”cells” in pseudoexfoliation
               syndrome. 
               Acta Ophthalmol. 
               1992; 
               70 
               201-208 
               
- 13 
               Küchle M, Nguyen N X, Naumann G OH. 
               Aqueous flare in eyes with choroidal malignant melanoma. 
               Am J Ophthalmol. 
               1992; 
               113 
               207-208 
               
- 14 
               Küchle M, Nguyen N X, Naumann G OH. 
               Tyndallometrie mit dem Laser-flare-cell-Meter bei intraokularen Entzündungen. 
               Ophthalmologe. 
               1994; 
               91 
               219-223 
               
- 15 
               Küchle M, Schönherr U, Nguyen N X. et al .
               Quantitative measurement of aqueous flare and aqueous ”cells” in eyes with diabetic
               retinopathy. 
               German J Ophthalmol. 
               1992; 
               1 
               164-169 
               
- 16 
               Stock R S, Ray W H. 
               Interpretation of photon correlation data: A comparison of analysis methods. 
               J Polym Sci. 
               1985; 
               23 
               1393-1147 
               
- 17 
               Fankhauser II F. 
               Dynamic light scattering in ophthalmology-results of in vitro and in vivo experiments. 
               Technology and Health Care. 
               2006; 
               14 
               521-535 
               
- 18 
               Sebag J. 
               Seeing the invisible: the challenge of imaging vitreous. 
               J Biom Optics. 
               2004; 
               9 
               38-46 
               
- 19 
               Sebag J, Ansari R R, Dunker S. et al .
               Dynamic light scattering of diabetic vitreopathy. 
               Diabetes Technol Therap. 
               1999; 
               1 
               169-176 
               
- 20 
               Ansari R R. 
               Ocular static and dynamic light scattering: a noninvasive diagnostic tool for eye
               research. 
               Biom Optics. 
               2004; 
               9 
               22-27 
               
- 21 
               Ansari R R, Suh K I, Dunker S. et al .
               Quantitative molecular characterisation of bovine vitreous and lens with non-invasive
               dynamic light scattering. 
               Exp Eye Res. 
               2001; 
               73 
               859-866 
               
- 22 
               Fankhauser II F. 
               Examination of the vitreous of diabetic patients by dynamic light scattering. 
               2007: in press; 
               
- 23 Balazs R EA, Denlinger J L. The Vitreous. The Eye New York; Academic Press 1984
               3 rd ed, Vol IA: 533-589 
- 24 
               Fankhauser II F. 
               Dynamic light scattering in retinal pathology. 
               2007: in press; 
               
- 25 
               Hiroake T, Clark J I, Li X Y. et al .
               Effect of selected anti-cataract agents on opacification in the selenite cataract
               model. 
               Exp Eye Res. 
               1996; 
               62 
               11-19 
               
- 26 
               Friberg G, Pande J, Benedek G B. 
               Pathetine inhibits the formation of high Tc protein aggregates in crystalline solutions. 
               Curr Eye Res. 
               1996; 
               15 
               1182-1190 
               
- 27 
               Fisher D H, Thurston G M, Ogun O. 
               Interaction of panthetine with bovine γB crystallin ARVO Abstract No. 4054. 
               Invest Ophthalmol Vis Sci. 
               1995; 
               36 
               S884 
               
PD Dr. Franz Fankhauser
            Augenzentrum Fankhauser
            
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