Recent in Biology (page 11 of 27)

Characterizing and Evaluating the Effectiveness of Volcanic Pumice Exfoliants

Pumice has a recognized application­­­­ as an abrasive agent to promote exfoliation of the skin. In this study, different particle size fractions of pumice sampled from several geologic occurrences in São Miguel’s island, the Azores archipelago, were used in the preparation of exfoliation formulations. Gels and soap were prepared and characterized, and their efficacy evaluated.

In Sight—UVA Protection Through Strawberry Anthocyanins

Scientists at the Università Politecnica delle Marche, The University of Barcelona, the University of Salamanca and the University of Granada have produced an extract of strawberry to quantify the ability of the fruit to protect the skin.

A Dermatological View—Percutaneous Penetration of Amino Acids

Skin care products containing amino acids often promote the benefits conferred on the skin by these molecules. Natural amino acids found in the skin have been found to improve the health of skin through antioxidation, membrane stabilization and increasing skin’s natural moisturizing factor (NMF).

Comparatively Speaking: Gram-positive vs. Gram-negative Bacteria

Tony O’Lenick asks industry expert Kelly Dobos to explain the difference between Gram-negative and Gram-positive bacteria to understand the importance of selecting the proper preservative system for a cosmetic.

A Review of Skin Hypopigmentation and Contemporary Strategies to Achieve an Even Skin Tone

Whether formulating for Asia, North America, Europe or Latin America, the cosmetic chemist will face one common demand in all these markets: an even skin tone. This article provides an overview of chemical and biological agents capable of causing hypopigmentation via interactions through different stages of the melanogenic pathway.

Comparatively Speaking: Pathogenic vs. Non-pathogenic Bacteria

To explain the difference between pathogenic and nonpathogenic bacteria, Tony O’Lenick looks to Kelly Dobos, who notes that nonpathogenic bacteria could become pathogens in immune-compromised hosts.

In Sight—Nano-sizing Chitosan for Wound Healing, Anti-aging

Mihaela Leonida, PhD, a professor of chemistry at Fairleigh Dickinson University, investigated the antibacterial properties of chitosan for cosmetic and pharmaceutical uses. She found that the material exhibited enhanced effects after being nano-sized.

A Dermatological View—Exploring Potential Differences in Percutaneous Penetration and Barrier Function Between Individuals of Different Ethnicity or Skin Color

The current understanding of percutaneous penetration and parameters that can influence it remains a sub judice area. Ethnicity or pigmentation, for instance, can be implied in percutaneous absorption for which several studies, described here, have been conducted to clarify their roles.

Propylparaben and Triclosan Found to Increase Allergy Risk in Children

A study conducted by Johns Hopkins Children's Center and funded by the National Institutes of Health supports the common "hygiene hypothesis" that some antibacterial chemicals and preservatives in hygiene products may make children more susceptible to food and environmental allergens.

Molecule Identified for Wound Healing and Psoriasis Applications

Researchers from the University of California, San Diego School of Medicine have identified a protein that may aid in the development of psoriasis and wound-healing treatments.

A 'Look' at Curl in Eyelashes

Many visually perceptible phenomena are observed in hair, which arise from intrinsic attributes as well as the orientation of fiber assembly. The use of image analysis to further understanding of hair properties is the focus of Roger McMullen contribution to Alluredbooks’ Practical Modern Hair Science, and in the following excerpt, he briefly turns his attention to that part of the body that bares perhaps more than a little semblance to hair: the eyelashes.

A Dermatological View—In vitro Buffering Capacity of Human Skin Layers

Previous studies demonstrate that skin buffering capacity can be measured in vitro by applying several concentrations of hydrogen chloride (HCl) and sodium hydroxide (NaOH) on skin and evaluating the pH change pre- and post-dosing. Here, the authors employed this technique to evaluate the buffering capacity of skin layers including intact SC, denuded SC and dermis skin samples.

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