Recent in Biology (page 27 of 28)

Correlating Transepidermal Water Loss and Percutaneous Absorption: An Overview

The extensive procedure required to measure percutaneous absorption versus transepidermal water loss (TEWL) enhances the desire to find a correlation between the 2 measurements to more easily assess skin barrier function. Experimentation investigating the correlation between TEWL and percutaneous absorption has yielded mixed findings. Yet despite the significant quantitative correlation demonstrated in some experiments, the precise qualitative relationship between percutaneous absorption and TEWL remains unsettled.

Protecting the Genome of Skin Cells from Oxidative Stress and Photoaging

According to a concept proposed here, protection of nuclear DNA and mitochondrial DNA against UVB and UVA radiation can break the vicious cycle responsible for skin photoaging.

Inside the Hair: An Advanced Hair Biology Model

In this survey from the literature, various writers describe a model of the inside of a hair strand, showing a multilamellar structure of the cuticle cells, a multifibril structure of the cortex, and a variety of lipids that are thought to be major contributors to the hair’s physical properties. What exactly is hair? Simply put, the answer is that hair is protein. But this simple answer does not even begin to explain the complexity and sophistication of the hair fiber.

Cigarette Smoking and Skin Biomarkers

Some research has been documented as to the damaging effects of smoking on the skin vasculature and on oxygenation in both human and animal models.

Silver, Titanium and Zirconium: Metals in Cosmetics and Personal-Care Products

This is the fifth article in a series reviewing the metals present in personal care products.

Lead, Manganese and Mercury: Metals in Personal Care Products

This article is the fourth in a series reviewing the metals present in personal care products. Earlier installments appeared in January 1998, Toxic Potential from Metals Absorbed through the Skin (pages 33-42); March 1999, Metals in Personal-Care Products, (pages 47-56); and August 2000, Chromium, Cobalt, Copper and Iron: Metals in Personal-Care Products, (pages 52-65).

Pigmentation, Swelling and Wrinkling in the Eye Area

Product development to address concerns of pigmentation, swelling, and wrinkling in the eye area requires a basic understanding of the area's unique anatomy and skin physiology.

A Dermatologic View: Metals in Cosmetics

A dermatologic view of nickel compounds in cosmetics.

Neuroimmunological Activities of Keratinocytes

The ability of keratinocytes to produce catecholamines indicates that the skin reacts to different types of environmental stress by secreting hormones that regulate vascular reactivity locally and blood flow through the microvascular circulation.

Odor Reception: Structure and Mechanism

Olfaction is a multi-step process involving the odorant molecule, the odor receptor protein, the pockets for odorant ligand docking, and the odor patterns formed by the glumeruli and decoded by the brain.

Skin Antioxidants

The skin is supplied with an antioxidant defense system that includes enzymatic and nonenzymatic components.

Intra- and Inter-Individual Differences Sensitive Skin

The authors investigated the intro-individual and the inter-individual variations of transepidermal water loss, capacitance and microcirculation in 10 different facial areas in subjects with "sensitive skin" and in subjects with "non-sensitive skin."

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