Related Experiment Video

Updated: Jun 26, 2026

Minimal Erythema Dose (MED) Testing
06:24

Minimal Erythema Dose (MED) Testing

Published on: May 28, 2013

[Possible values of UV index in Serbia]

Milorad Letić

    Srpski Arhiv Za Celokupno Lekarstvo
    |January 31, 2009
    PubMed
    Abstract

    More Related Videos

    Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response06:31

    Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response

    Published on: October 3, 2019

    Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer06:27

    Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer

    Published on: May 29, 2019

    Related Concept Videos

    UV–Vis Spectrum01:30

    UV–Vis Spectrum

    When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
    The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar absorptivity (ε) or log ε on the y-axis (ordinate)...
    UV–Vis Spectroscopy of Conjugated Systems01:32

    UV–Vis Spectroscopy of Conjugated Systems

    Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
    One of the factors influencing λmax is the extent of conjugation in the...
    Degree of Unsaturation02:05

    Degree of Unsaturation

    The degree of unsaturation (U), or index of hydrogen deficiency (IHD), is defined as the difference in the number of pairs of hydrogen atoms between the compound and the acyclic alkane with the same number of carbon atoms. Each double bond or ring costs two hydrogen atoms compared to a saturated analog and results in one degree of unsaturation.
    The degree of unsaturation for hydrocarbons is U = (2C + 2 − H) / 2, where C is the number of carbon atoms and H is the number of hydrogen atoms.
    For...
    Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

    Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

    Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
    UV–Vis Spectrometers01:14

    UV–Vis Spectrometers

    The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
    UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

    UV–Vis Spectroscopy: Woodward–Fieser Rules

    UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...