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Related Concept Videos

Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Photosystem I01:27

Photosystem I

Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Photosystem II01:22

Photosystem II

The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.

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Updated: Jun 22, 2026

Using a 1064-nm Picosecond Neodymium-Doped Yttrium Aluminum Garnet Laser for Periorbital Hyperpigmentation
04:43

Using a 1064-nm Picosecond Neodymium-Doped Yttrium Aluminum Garnet Laser for Periorbital Hyperpigmentation

Published on: May 23, 2025

[Photodepilation].

P Serrano-Grau1, A Campo-Voegeli, D Romero

  • 1Centro Dermatológico Barnaclínic, Servicio de Dermatología, Hospital Clínic de Barcelona, Clínica Dermatológica Campo De Felipe, Barcelona, España. serranograu@yahoo.es

Actas Dermo-Sifiliograficas
|June 30, 2009
PubMed
Summary
This summary is machine-generated.

Light therapies, including lasers and intense pulsed light, are effective for unwanted hair removal. This review compares various photodepilation methods for treating hair growth.

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Stimulation of Stem Cell Niches and Tissue Regeneration in Mouse Skin by Switchable Protoporphyrin IX-Dependent Photogeneration of Reactive Oxygen Species In Situ
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Enhancement of Facial Rejuvenation Through a Combination of 1565 nm Non-Ablative Fractional Laser with 30% Supramolecular Salicylic Acid
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Area of Science:

  • Dermatology and Aesthetic Medicine
  • Biomedical Optics
  • Hair Biology

Context:

  • Unwanted hair is a prevalent concern addressed by various light-based therapies.
  • Since 1996, significant advancements have occurred in laser and light-based hair removal technologies.
  • Red and near-infrared wavelengths (600-1200 nm) are primary for targeting melanin in hair shafts and follicles.

Purpose:

  • To review and compare available photodepilation methods.
  • To highlight the evolution of light-based hair removal technologies.
  • To discuss the mechanisms of action for laser and intense pulsed light hair removal.

Summary:

  • Light therapies, particularly lasers and intense pulsed light (IPL), are established treatments for unwanted hair.
  • These methods utilize specific wavelengths to target melanin in the hair shaft and follicle.
  • The review details the current landscape of photodepilation techniques.

Impact:

  • Provides a comparative overview of photodepilation options.
  • Informs clinicians and researchers on the efficacy and mechanisms of light-based hair removal.
  • Contributes to understanding the advancements in aesthetic dermatology treatments.