Atomic force microscopy and near-field scanning optical microscopy measurements of single human retinal lipofuscin granules
Article Abstract:
Studies done to characterize the spatial distribution of orange emitting fluorophores, such as, A2E, in lipofuscin granules isolated from human retinal pigment epithelium cells by using novel high-resolution microscopic techniques is reported. Granules are imaged using atomic force microscopy (AFM) and near field- scanning optical microscopy (NSOM) and the results demonstrate that the orange fluorophores may not be the dominant photoactive species in lipofuscin.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2000
User Contributions:
Comment about this article or add new information about this topic:
Photoionization threshold of eumelanosomes determined using UV free electron laser-photoelectron emission microscopy
Article Abstract:
The application of UV-free electron laser photoelectron emission microscopy (UV-FEL PEEM) to measure the threshold photoelectron spectrum and photoionization potential for human eumelanosomes is described. The UV-FEL PEEM images collected on human eumalenasomes isolated from black hair show that the organelle is photoionized by UV-B radiation and the photoionization threshold is determined to be 4.6 plusmn 0.2eV.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2004
User Contributions:
Comment about this article or add new information about this topic:
Carotenoid radical-melanin interactions
Article Abstract:
The radical cations of five dietary carotenoids are shown to react with dopamelanin and cysteinyldopamelanin in both micellar and homogenous environments. The previously unidentified protective roles for melanin/carotenoid combinations are demonstrated by the repair reactions, especially where the maintenance of the small carotenoid concentration is vital to avoid deleterious effects.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2000
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Spectroscopy and dynamics of nanometer-sized noble metal particles. Photophysics of nanometer sized metal particles: electron-phonon coupling and coherent excitation of breathing vibrational modes
- Abstracts: Electric field modulated near-field photo-luminescence of organic thin films. Iron metalization of fluorinated organic films: a combined photoelectron spectroscopy and atomic force microscopy study
- Abstracts: Insights into hydrogen atom adsorption on and the electrochemical properties of nitrogen-substituted carbon materials
- Abstracts: Sorption and ordering of dibranched alkanes on medium-pore zeolites ferrierite and TON. Polar ordering at an interface between a liquid crystal monolayer and a rubbed polyimide
- Abstracts: Two-dimensional attenuated total reflection/infrared correlation spectroscopy of adsorption-induced and concentration-dependent spectral variations of beta-lactoglobulin in aqueous solutions