Upper gastrointestinal series tract in addition to barium, and this procedure is called double-contrast imaging. In this case the gas is referred to as the negative contrast medium. Traditionally the images produced with barium contrast are made with plain-film radiography, but computed tomography is also used in combination with barium contrast, in which case the procedure is called CT enterography. Various types of barium X-ray examinations are used to examine different parts of the gastrointestinal tract. These include barium swallow, barium meal, barium follow-through, and barium enema. The barium swallow, barium meal, and barium follow-through are together also called an upper gastrointestinal series
Tenthredo colon feed on leaves of "Epilobium hirsutum", "Chamerion angustifolium", "Pteridium aquilinum" and "Salix". This species can be found in hedge rows in most of Europe and in the Nearctic ecozone. Tenthredo colon Tenthredo colon is a sawfly species belonging to the family Tenthredinidae (common sawflies). "Tenthredo colon" can reach a length of about . These sawflies have black head and thorax. Abdomen is black with a reddish area towards the tip. Legs are reddish. Antennae are black, with white tips. The larvae are pale brown with a characteristic diamond pattern of diagonal cross lines and a darker brown mark on the