For healthy skin, collagen is key: This naturally occurring protein keeps skin smooth and youthful, but our bodies produce less collagen as we get older. The result? Thinner skin, dryness, and more wrinkles.
Definition of BLACK BILE. : a humor of medieval physiology believed to be secreted by the kidneys or spleen and to cause melancholy. ADVERTISEMENT.1681. a humor of medieval physiology believed to be secreted by the kidneys or spleen and to cause melancholy. ADVERTISEMENT. 1681.
Bile Esculin Test. In this medium there is bile and esculin. Bile is the selective agent used to separate Streptococcus bovis and enterococci from other streptococci. Esculin is present because only the group D streptococci and enterococci can hydrolyze esculin in the presence of bile salts.1  Any blackening of the medium means Bile-Esculin positive and presumptive identification of group D streptococcus or Enterococcus. Any blackening of the medium means Bile-Esculin positive and presumptive identification of group D streptococcus or Enterococcus. 2  Note, if there is blackening of the medium before 48 hours, it can be recorded as Bile-Esculin positive.