By Denise Falcone, Irene Castellano Pellicena, and Natallia E. Uzunbajakava
March 15, 2018
Phototransduction is the mechanism whereby photons are ‘received’ by a photoreceptor and converted into a cellular response. In humans, the most well-known example of phototransduction is the image forming process of human vision, in which photons interact with light-sensitive opsin family proteins. Until recently, phototransduction in humans was exclusively attributed to the cells of the vision system. New evidence described the existence of melanopsin acting as a non-image forming photoreceptor in the retina, and considered to have light-regulated tasks. Likewise, another opsin (peropsin) was identified in human ocular tissues and hypothesized to play a role in the retinal pigment epithelium. As for tissues outside the visual system, expression of several types of opsins in humans was reported in the skin, hair follicles, and resident cells among other tissues.
Thermal Styling: A Look at Hair Shaft Deficiencies Caused by Excessive Use of Thermal Styling Appliances
By Toni Woodard
March 15, 2018
Thermal styling is a very common practice among women due to the many benefits that it provides. Many women with textured hair know that if heat is used on their hair, there is a possibility that when the hair is washed again some of the hair may not revert completely back to its original curl pattern. The curls may actually be looser with stray fibers becoming quite unruly as result of the heat damage. Even more serious, there are other common conditions that can afflict hair due to thermal exposure, especially if heating appliances are used excessively or improperly. Three conditions that can result from excessive thermal exposure are trichoptilosis, acquired trichorrhexis nodosa, and bubble hair.
Molecule of the Week