00:01
This problem asks us about the breath test for our helicobacter pylori or h.
00:05
Pylori, which is the bacteria that commonly causes stomach ulcers.
00:11
And so what we want ideally in clinical medicine is a nice, sensitive, specific test that's cheap, that lets us detect h.
00:18
Pylori and if it's present in the stomach.
00:22
And luckily, we have a pretty great one.
00:23
So we can ask our patient to drink a solution that includes a substance that is called urea, that is going to be labeled or radio labeled.
00:34
So urea is a small molecule.
00:36
It's got a nitrogen, a carbon, oxygen, a couple of hydrogens on here.
00:40
And we're going to use an isotope of carbon that is different than the isotope that's commonly found in the atmosphere or found in the body.
00:48
And that way, any molecule that's derived from this labeled urea and that incorporates that isotope, that labeled isotope of carbon is going to be easy for us to identify chemically.
01:01
So if the patient's stomach contains h...