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271 results on '"Gellermann, Werner"'

61. Stimulated emission and lasing in π-conjugated polymer films, microstructures and opal photonic crystals

Author

Vardeny, Z. Valy, Frolov, Sergey V., Chinn, Douglas, Shkunov, Maxim N., Gellermann, Werner, Yoshino, Katsumi, Fujii, Akihiko, Gregory, Richard V., Baughman, Ray H., Zakhidov, Anvar A., Vardeny, Z. Valy, Frolov, Sergey V., Chinn, Douglas, Shkunov, Maxim N., Gellermann, Werner, Yoshino, Katsumi, Fujii, Akihiko, Gregory, Richard V., Baughman, Ray H., and Zakhidov, Anvar A.

Abstract

SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States, Z. Valy Vardeny, Sergey V. Frolov, Douglas Chinn, Maxim N. Shkunov, Werner Gellermann, Katsumi Yoshino, Akihiko Fujii, Richard V. Gregory, Ray H. Baughman, and Anvar A. Zakhidov "Stimulated emission and lasing in π-conjugated polymer films, microstructures, and opal photonic crystals", Proc. SPIE 3797, Organic Light-Emitting Materials and Devices III, (17 December 1999). DOI: https://doi.org/10.1117/12.372698

Published
1999

84. Measurement of Carotenoids in the Living Primate Eye Using Resonance Raman Spectroscopy.

Author

Walker, John M., Armstrong, Donald, Bernstein, Paul S, and Gellermann, Werner

Abstract

The xanthophyll carotenoids lutein and zeaxanthin (see Note 1) are specifically concentrated in the macula of the primate eye, the region of the retina responsible for high-resolution visual acuity necessary for reading, driving, and recognizing faces. They are thought to protect the macula from light-induced oxidative damage by acting as light-screening filters for short wavelength visible light and by acting as in situ antioxidants to prevent oxidative damage to polyunsaturated membrane lipids (1,2). Since high dietary intakes and blood levels of lutein and zeaxanthin have been epidemiologically associated with a lower risk of visual loss from age-related macular degeneration (AMD) (3,4), there has been considerable interest in measuring carotenoid macular pigment levels in living human eyes as a possible early test to detect individuals at high risk for visual loss from AMD. The current most commonly used method, psychophysical heterochromatic flicker photometry, has significant drawbacks since it is a subjective test that requires an attentive observer with good visual acuity, and it has a high intrasubject variability that may exceed ± 50% (5,6), which tends to limit its utility as a screening or diagnostic test. We have developed an alternative objective measurement method based on the principles of resonance Raman spectroscopy. This method is rapid, specific, sensitive, and highly reproducible, characteristics conducive to its use as a screening and diagnostic test on large populations with a wide range of visual acuities. [ABSTRACT FROM AUTHOR]

Published
2002
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90. Resonance Raman based skin carotenoid measurements in newborns and infants.

Author

Ermakov, Igor V., Ermakova, Maia R., Bernstein, Paul S., Chan, Gary M., and Gellermann, Werner

Abstract

We describe Resonance Raman based skin carotenoid measurements in newborns and infants. Skin- and serum carotenoid levels correlate with high statistical significance in healthy newborns and infants, and with reduced accuracy also in prematurely born infants, who in general feature very low carotenoid levels and thin transparent skin giving rise to large background absorption effects. Skin carotenoid levels can be easily compared among subjects and/or tracked in longitudinal studies with the highly molecule-specific Raman method. It therefore holds promise as a rapid, non-invasive, carotenoid antioxidant assessment method for newborns and infants in the field of pediatrics. (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [ABSTRACT FROM AUTHOR]

Published
2013
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98. Reply to Byker Shanks et al. Measurement of Fruit and Vegetable Intake Incorporating a Diversity, Equity, and Inclusion Lens. Comment on "Di Noia, J.; Gellermann, W. Use of the Spectroscopy-Based Veggie Meter ® to Objectively Assess Fruit and Vegetable Intake in Low-Income Adults. Nutrients 2021, 13 , 2270"

Author

Di Noia, Jennifer and Gellermann, Werner

Abstract

The article describe the Veggie Meter (VM) as using resonance Raman spectrometry with two optical methods for assessing skin carotenoid status for nutritional studies in resonance Raman spectroscopy and pressure-mediated reflection spectroscopy.

Published
2022
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