Volume 88, Number 7 www.aafp.org/afp American Family Physician 457 A 41-year-old man presented with a painful, erythematous, erosive, and scaly rash. It was symmetrically distributed over sun-exposed areas, involving his face, neck, dorsum of his hands and feet, and upper back (Figures 1 and 2). The rash and frequent loose stools had been present for several months. Neuropsychiatric evaluation ...

Pityriasis rubra pilaris (PRP) is a rare, chronic papulosquamous skin disorder. The skin lesions rarely have a predilection to sun-exposed areas although it is known that natural sunlight and phototherapy can exacerbate PRP [1–4]. We present a case of a patient suffering from pityriasis rubra pilaris with photoexposed distribution and photosensitivity exclusively to UVB objectively detected by ...

In addition to regular photoreceptors, some invertebrates possess simple extraocular photoreceptors. For example, the central ganglia of mollusks contain photosensitive neurons. These neurons are located on the dorsal surface of the ganglia and based on their electrophysiological properties, it has been postulated that they are the internal photoreceptors. However, besides the eye, transduction...

The photosensitive properties of a centrosymmetric gadolinium gallium garnet crystal doped with calcium are investigated at room temperature. Elementary holograms can be recorded over a wide range of wavelengths in the visible spectral range. The photosensitive properties are studied experimentally using beam coupling and angular response experiments. Mixed absorption and refractive-index grati...

The present invention relates to a low electronic conductivity polymer composition having well dispersed metal granules, a stable powder made from photosensitive polycrystalline complexes of pyrrole, or its substituted derivatives and silver cations for making the polymer composition, and methods of forming the stable powder and polymer composition, respectively. A polycrystalline complex of si...

The motor outputs of the isolated opisthosomal ventral nerve cord in Limulus polyphemus are modulated by light. We have identified the photosensitive neurons and examined their physiological and morphological properties using intracellular recording and staining techniques. We found that photosensitive neurons are present in each ganglion of the opisthosomal ventral nerve cord. These neurons of...

A series of non-photoautotrophic mutants of Chlamydomonas reinhardii was isolated by replica-plating mutagenized cells which had been grown in the dark. Many of these acetate-requiring mutants are photosensitive, showing poor growth on acetate medium in the light, but normal growth in the dark. Biochemical characterization showed that the photosensitive mutants all had specific lesions in photo...

We present an overview of the physics of self-written waveguides created in photosensitive optical materials, including the experimental observations and the corresponding theoretical models for describing the growth of both bright and dark self-written beams. We discuss in more details the properties of self-written waveguides created in photosensitive polymers, which have been discovered in t...