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New in Biology (page 28 of 30)
Dec 23, 2005 | 04:05 PM CST
By: Hongbo Zhai, MD, and Howard I. Maibach, MD, Un…
This is the third article in a series discussing effects of occlusion on skin. Previously, we reviewed the effects of occlusion on the percutaneous absorption (C&T November 2003) and on wound healing (C&T April 2004). The present article focuses and summarizes the adverse effects of occlusion. Occlusion enhances skin hydration and increases percutaneous absorption of applied substances with exception. On the other hand, it may also increase the penetration of irritants and/or antigens entering into skin and hence may increase irritant and allergic contact dermatitis. Additionally, occlusion compromises skin barrier function by impairing passive transepidermal water loss at the application site, and hence aggravates the irritant effect of applied compounds.
Dec 23, 2005 | 03:04 PM CST
By: Bobeck S. Modjtahedi, Sara P. Modjtahedi and H…
Are females more sensitive to allergens than males? If they are, is it because of something innate in female skin or because of life patterns of exposure to irritants?
Dec 13, 2005 | 11:26 PM CST
By: Valerie D. Callender and Cherie M. Young, Howa…
This article surveys the racial differences of hair, and then focuses on African-Americans, their hair grooming practices and how these practices relate to the common hair and scalp disorders unique to this population.
Dec 13, 2005 | 10:24 PM CST
By: Hongbo Zhai and H.I. Maibach
Superficial wounds may be evaluated and treated in the cosmetic field. However, with natural wounds it is difficult to evaluate the effects of therapy upon the repair process because natural wounds may vary according to several factors, such as wound induction (physical or chemical), depth (superficial or deep), size (regular or irregular), site-to-site variability, and environmental factors (infection or not).
Dec 13, 2005 | 09:53 PM CST
By: Gil Yosipovitch, MD, and Kelly L. Barham, MD
This review of literature suggests that crosstalk between the stratum corneum and nerve fibers in the epidermis is the process by which itch is transmitted to the central nervous system. A rationale is presented for using moisturizers to reduce itch.
Dec 13, 2005 | 09:47 PM CST
By: Ivy Lee and H.I. Maibach
Use of mineral spa water and seawater has been and continues to be a common treatment modality for inflammatory skin conditions such as psoriasis, atopic dermatitis and irritant contact dermatitis.
Dec 08, 2005 | 01:44 AM CST
By: Jackie Levin and H.I. Maibach
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.
Dec 01, 2005 | 03:52 PM CST
By: L. Danoux, C. Jeanmaire, V. Bardey, G. Périé, …
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.
Nov 01, 2005 | 02:44 PM CST
By: Randy Schueller and Perry Romanowski, Alberto-…
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.
Sep 01, 2005 | 09:51 AM CDT
By: Raja K. Sivamani and Gabriel Wu, Department of…
Friction is an important characteristic of skin because it allows us to execute many of our daily activities. In addition, friction studies offer insight into how skin and the skin surface change across age, gender, race, anatomical site, and chemical applications. This can provide better information about expected skin variations in the population and why certain topical applications are effective.