A new form of self-assembling polymer film that bends and stretches when hit by light is pointing the way to a new family of functional materials. This flexing film is the first material to have been made by coaxing complex molecules to form large-scale, highly ordered three dimensional arrays—a discovery that could change the way that many active material are made, from artificial muscles to solar cells.
This is a preview of Polymer Bends with Light Useful for Artificial Muscles. Read the full post (477 words, 2 images, estimated 1:54 mins reading time)
The Skin is a Composite of 3 Layers
- This diagram is from the copyright-free collection, The Sourcebook of Medical Illustration, edited by Peter Cull (Park Ridge, NJ: Parthenon, 1989).
- Epidermis: outermost layer, mostly dead keratinized cells (stratified squamous epithelium). No blood vessels, gets nutrition from dermis. Dead cells slough off and are replaced by dividing cells in the stratum basale. Half life of skin cells about 35 days.
- Dermis: contains blood vessels, nerves, sensory receptors for touch, pressure, hot, cold, pain. Also has hair follicles and sweat glands. All this is imbedded in fibrous connective tissue.
This is a preview of SKIN BARRIER AND TEMPERATURE CONTROL IN HUMAN BODY-PHYSIOLOGY TUTORIAL. Read the full post (1228 words, 4 images, estimated 4:55 mins reading time)