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Related Concept Videos

Role of Skin in Vitamin D Synthesis01:23

Role of Skin in Vitamin D Synthesis

The skin plays a crucial role in the synthesis of vitamin D, a vital nutrient for various physiological processes in the body. Vitamin D is unique because it can be synthesized in the skin through a series of chemical reactions triggered by exposure to ultraviolet B (UVB) radiation from sunlight.
The solar UV B rays (290-315 nm) are absorbed by the skin, and 7-dehydrocholesterol (provitamin D3) photolyzes it to previtamin D3, which undergoes a rapid transformation to vitamin D3(cholecalciferol).
Skin Cancer01:30

Skin Cancer

Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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...
Acne Infection01:27

Acne Infection

Acne is a multifactorial skin condition primarily affecting adolescents and young adults, with a global prevalence estimated to exceed 75% in this demographic. The condition is characterized by the formation of comedones (blackheads and whiteheads), papules, pustules, nodules, and, in severe cases, cysts, particularly in areas rich in sebaceous glands such as the face, neck, chest, and back. The pathogenesis involves increased sebum production, follicular hyperkeratinization, colonization by...
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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Related Experiment Video

Updated: Jul 15, 2026

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight
10:27

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight

Published on: October 11, 2016

Physical sunscreens: on the comeback trail.

Balaji D More1

  • 1Steifel Pharmaceuticals India Ltd, India. bdmdcp@yahoo.com

Indian Journal of Dermatology, Venereology and Leprology
|April 26, 2007
PubMed
Summary

Physical sunscreens offer safe protection against ultraviolet radiation-induced skin damage, especially for sensitive skin. Microfine oxides improve cosmetic acceptability by making them transparent, addressing a key limitation of traditional physical sunscreens.

Area of Science:

  • Dermatology
  • Cosmetic Science
  • Materials Science

Background:

  • Ultraviolet (UV) radiation causes significant skin damage.
  • Sunscreens are essential for mitigating UV-induced harm.
  • Traditional chemical sunscreens can cause skin sensitivity and irritation.

Purpose of the Study:

  • To review the resurgence of physical sunscreens.
  • To analyze the benefits of physical sunscreens for sensitive skin.
  • To discuss advancements in physical sunscreen formulations.

Main Methods:

  • Literature review of scientific data.
  • Analysis of physical sunscreen properties.
  • Evaluation of cosmetic acceptability of microfine oxides.

More Related Videos

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
12:37

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model

Published on: September 7, 2013

Related Experiment Videos

Last Updated: Jul 15, 2026

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight
10:27

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight

Published on: October 11, 2016

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
12:37

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model

Published on: September 7, 2013

Main Results:

  • Physical sunscreens are inert, safe, stable, and non-irritating.
  • Microfine oxide technology enhances cosmetic elegance by providing transparency.
  • Physical sunscreens are suitable alternatives for individuals with sensitive skin.

Conclusions:

  • Physical sunscreens are regaining prominence due to safety and efficacy.
  • Microfine oxides have overcome the aesthetic drawbacks of traditional physical sunscreens.
  • Advancements support the development of broad-spectrum, safe, and cosmetically acceptable sunscreens.