|
|
The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
The human body produces and destroys 15 million blood cells every second.
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
![Photosynthetically active radiation (PAR) diminishes substantially with passage through the canopy o](https://biology-forums.com/gallery/47/medium_33_09_09_11_10_14_55_17071329.jpeg)
![Two general models for the interconversion of inactive and active forms of a protein during cooperat](https://biology-forums.com/gallery/47/medium_9828_12_01_13_10_51_08.jpeg)