OBJECTIVE To assess the extent to which UV-A and UV-B radiation can penetrate the human fingernail plate. DESIGN The Dermalite UV light machine (National Biological, Beachwood, Ohio) was used as the source of UV radiation. The amount of UV-A and UV-B penetrating the nail plate was measured using a radiometer and compared with a control. SETTING Academic phototherapy clinic. PATIENTS Ten c...

Background: Previous studies have shown that exposure to electromagnetic fields produced by magnetic resonance imaging or mobile phones can lead to increased microleakage of dental amalgam.Objective: The aim of the present study was to investigate the effect of electromagnetic field of a commercial dental light cure device and a common GSM mobile phone on microleakage of amalgam restorations.Ma...

This theme issue provides an overview on recent developments of light-mediated imaging and therapy approaches, with an emphasis on those that transcend the shallow tissue penetration dogma.

Venipuncture is an important health diagnosis process. Although venipuncture is one of the most commonly performed procedures in medical environments, locating the veins of infants, obese, anemic, or colored patients is still an arduous task even for skilled practitioners. To solve this problem, several devices using infrared light have recently become commercially available. However, such devi...

DURING measurements of the penetration of light into water (4), evidence was obtained which suggested that the water of Windermere was less transparent in 1932 than it had formerly been. There were also indications that the depth distribution of vegetation in this lake had changed. It was, therefore, decided to repeat some measurements of light penetration and vegetation distribution which had ...

We are studying the transmission of LED array-emitted near-infrared (NIR) light through human tissues. Herein, we simulated and measured transcranial NIR penetration in highly scattering human head tissues. Using finite element analysis, we simulated photon diffusion in a multilayered 3D human head model that consists of scalp, skull, cerebral spinal fluid, gray matter and white matter. The opt...

In agricultural and natural systems, diffuse light can enhance plant primary productivity due to deeper penetration into and greater irradiance of the entire canopy. However, for individual sun-grown leaves from three species, photosynthesis is actually less efficient under diffuse compared with direct light. Despite its potential impact on canopy-level productivity, the mechanism for this leaf...