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Related Concept Videos

Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
The Skin Microbiota01:27

The Skin Microbiota

The human skin serves as a complex ecosystem inhabited by a diverse community of microorganisms, including bacteria, fungi, and viruses. This microbiome plays a critical role in maintaining skin health and defending against pathogenic invaders. The composition of microbial communities varies significantly across different regions of the body, influenced primarily by the local levels of moisture and sebum.Regional Variation in Skin MicrobiotaCutibacterium acnes predominantly colonizes sebaceous...
Physiological Barriers01:25

Physiological Barriers

Physiological barriers are semi-permeable cellular structures restricting drug diffusion into intracellular compartments and tissues. There are six types of physiological barriers: blood endothelial, cell membrane, blood-brain, blood-cerebrospinal fluid (CSF), blood-placenta, and blood-testis barriers.
The blood endothelial barrier is the most porous of these. It allows all small ionized, un-ionized, and lipophilic molecules to pass through the endothelial lining into the interstitial space...
Layers of the Epidermis01:21

Layers of the Epidermis

The epidermis, the outermost layer of the skin, is composed of several distinct layers. From deep to superficial, the layers of the epidermis are as follows:
Stratum Basale
Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
Papillary Dermis01:11

Papillary Dermis

Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen and...

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Related Experiment Video

Updated: May 9, 2026

Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery
09:44

Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery

Published on: September 26, 2025

Analysing the skin barrier from down under.

J Grice1, H A E Benson

  • 1Therapeutics Research Centre, School of Medicine, University of Queensland, Brisbane, Qld., Australia.

Skin Pharmacology and Physiology
|August 8, 2013
PubMed
Summary
This summary is machine-generated.

Michael Roberts pioneered skin science in Australia, developing mathematical models for skin permeation and drug delivery. His work improved clinical outcomes and reduced toxicological risks.

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Area of Science:

  • Dermal and epidermal science
  • Pharmacokinetics and drug delivery
  • Toxicology and risk assessment

Background:

  • Michael Roberts' 40-year career has significantly advanced Australian skin science.
  • His early work in membrane permeation, published in Nature, laid the foundation for understanding skin permeability.
  • His research integrates fundamental science with practical applications in medicine and product safety.

Discussion:

  • Characterized by a mechanistic, mathematical approach, Roberts defined key skin permeation parameters and structure-penetration relationships.
  • He established the significance of maximum flux for clinical and toxicological assessments.
  • His work revealed a parabolic relationship between maximum flux and lipophilicity, driven by stratum corneum solubility.

Key Insights:

  • Roberts excels at translating complex biological concepts into mathematical models for epidermal, dermal, and follicular transport.
  • He pioneered technologies for skin barrier analysis and permeation modulation.
  • His fundamental research on iontophoresis provided models for enhanced drug permeation.

Outlook:

  • Roberts' research has directly led to improved clinical treatments and reduced toxicological risks.
  • His findings have influenced regulatory standards for skin products.
  • His legacy continues to shape the future of skin science and transdermal delivery.