Abdominal x-ray as a scout film for other procedures such as barium enemas. An upper gastrointestinal series is where a contrast medium, usually a radiocontrast agent such as barium sulfate barium salt mixed with water, is ingested or instilled into the gastrointestinal tract, and X-rays are used to create radiographs of the regions of interest. The barium enhances the visibility of the relevant parts of the gastrointestinal tract by coating the inside wall of the tract and appearing white on the film. A lower gastrointestinal series is where radiographs are taken while barium sulfate, a radiocontrast agent, fills the colon via an
Colon (punctuation) By default, however, filenames use the Segoe UI font, and the tone letter U+A789 is identical to the colon in this font, so it can be used in place of the colon. Several programming languages use the colon for various purposes. A number of programming languages, most notably Pascal and Ada, use a colon immediately followed by an equality sign (codice_1), in which case the colon and the equality sign are considering to compose to an independent "assignment sign"; this can be represented in Unicode as . Labels—targets for jumps, notably goto, but also some switch statements—are general formed of