There, colonic bacteria deconjugate and metabolize the bilirubin into colorless urobilinogen, which can be oxidized to form urobilin and stercobilin : these give stool its characteristic brown color.
12.
A lack of water intake, for example following sleep or dehydration, reduces the water content of urine, thereby concentrating urobilin and producing a darker color of urine.
13.
Obstructive jaundice reduces biliary bilirubin excretion, which is then excreted directly from the blood stream into the urine, giving a dark-colored urine but with a paradoxically low urobilin concentration, no urobilinogen, and usually with correspondingly pale faeces.
14.
These tests include complete blood count; hemoglobin electrophoresis; serum transferrin, ferritin, total iron-binding capacity; urine urobilin and urobilogen; peripheral blood smear, which may show codocytes, or target cells; hematocrit; and serum bilirubin.
15.
A 1996 study by McPhee et al . suggested that stercobilin and other related pyrrolic pigments including urobilin, biliverdin, dimethyl ester, and xanthobilirubic acid has potential to function as a new class of HIV-1 protease inhibitors when delivered at low micromolar concentrations.
16.
It can either be further converted into stercobilinogen, which is then oxidized to stercobilin and passed out in the feces, or it can be reabsorbed by the intestinal cells, transported in the blood to the kidneys, and passed out in the urine as the oxidised product urobilin.
17.
I didn't quickly find an absorption spectrum of urobilin online, though it is probably here, unless you count a . . . very early version . ( There may be aspects of the relation with urobilinogen and pH that I haven't appreciated ) talk ) 15 : 21, 14 October 2014 ( UTC)
18.
Substitution may be made for only one of the hydrogen atoms attached to the nitrogen atom, and the CONH 2 groups must be free " . . . the author then goes on to describe later researchers who found that this wasn't strictly true, and some compounds like urobilin without any CONH 2 s would react . talk ) 16 : 29, 8 October 2010 ( UTC)
