53 research outputs found
Raman scattering gain in DOO-PPV films
Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United StatesMaxim N. Shkunov, Werner Gellermann, Akihiko Fujii, Katsumi Yoshino, and Z. Valy Vardeny "Raman scattering gain in DOO-PPV films", Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997). DOI: https://doi.org/10.1117/12.29552
Near-infrared ps transient photoinduced absorption in conjugated systems
Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United StatesSergey V. Frolov, Werner Gellermann, Z. Valy Vardeny, Masanori Ozaki, Katsumi Yoshino, Thomas J. Barton, and Guglielmo Lanzani "Near-infrared ps transient photoinduced absorption in conjugated systems", Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997). DOI: https://doi.org/10.1117/12.29553
Two-photon absorption spectra of luminescent conducting polymers measured over wide spectral range
Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United StatesRon K. Meyer, Martin Liess, Robert E. Benner, Werner Gellermann, Z. Valy Vardeny, Masanori Ozaki, Katsumi Yoshino, Yi Wei Ding, and Thomas J. Barton "Two-photon absorption spectra of luminescent conducting polymers measured over wide spectral range", Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997). DOI: https://doi.org/10.1117/12.27927
Stimulated emission and lasing in π-conjugated polymer films, microstructures and opal photonic crystals
SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United StatesZ. 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/10.1117/12.37269
Concurrent validity of skin carotenoid status as a concentration biomarker of vegetable and fruit intake compared to multiple 24-h recalls and plasma carotenoid concentrations across one year: a cohort study
Background
Biological markers of vegetable and fruit (VF) intake are needed both for nutrition surveillance and for the evaluation of nutrition interventions. Optically assessed skin carotenoid status (SCS) has been proposed as a marker of intake but there are few published validity studies to date. Therefore, the objective of the study was to examine the concurrent validity of multiple methods of assessing VF intake cross-sectionally and seasonally over one year and to discuss the relative merits and limitations of each method.
Methods
Fifty-two 40–60 y old women completed a 1-year longitudinal study that included 1) SCS assessment using resonance Raman spectroscopy (RRS) and using pressure-mediated reflection spectroscopy (RS) at 12 timepoints, 2) thirty-six 24-h recalls using the Automated Self-Administered 24-Hour Dietary Assessment Tool (ASA24; total 1866 recalls), and 3) plasma carotenoid concentrations measured every 3 months. Pearson correlation coefficients and mixed linear models were used to estimate pairwise correlations between RRS, RS, ASA24, and plasma carotenoids.
Results
RS and RRS were strongly correlated at baseline and over the year (r = 0.86 and 0.76; respectively, P < 0.001). RS was strongly correlated with plasma carotenoids at baseline (r = 0.70) and moderately across the year (r = 0.65), as was RRS (r = 0.77 and 0.69, respectively, all P < 0.001). At baseline, self-reported VF was weakly correlated with RRS (r = 0.33; P = 0.016), but not with RS or plasma carotenoids. Across the year, self-reported VF intake was weakly correlated with both RS (r = 0.37; P = 0.008), RRS (r = 0.37; P = 0.007), and with plasma carotenoids (r = 0.36; P < 0.008).
Conclusions
SCS as measured by RS and RRS is moderately to strongly correlated with plasma carotenoid concentrations both cross-sectionally and longitudinally, indicating that it can be a powerful tool to assess carotenoid-rich VF intake in populations
Optics and Quantum Electronics
Contains table of contents for Section 3 and reports on eighteen research projects.Defense Advanced Research Projects Agency/MIT Lincoln Laboratory Contract MDA972-92-J-1038Joint Services Electronics Program Grant DAAH04-95-1-0038National Science Foundation Grant ECS 94-23737U.S. Air Force - Office of Scientific Research Contract F49620-95-1-0221U.S. Navy - Office of Naval Research Grant N00014-95-1-0715MIT Center for Material Science and EngineeringNational Center for Integrated Photonics Technology Contract DMR 94-00334National Center for Integrated Photonics TechnologyU.S. Navy - Office of Naval Research (MFEL) Contract N00014-94-1-0717National Institutes of Health Grant 9-R01-EY11289MIT Lincoln Laboratory Contract BX-5098Electric Power Research Institute Contract RP3170-25ENEC
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