Probiotics such as bifidobacteria are typically used in cases when a disease occurs or might occur due to a kill-off of normal bacteria. For example, treatment with antibiotics can destroy disease-causing bacteria, but also normal bacteria in the GI (gastrointestinal) and urinary tracts.
The 3-place Hiller Model 360, military H-23 Raven, was based on the U.S. Navy UH-12, which was first flown in 1948. The H-23 Raven performed as a utility, observation, and MedEvac helicopter during the Korean war.
China unveils world's largest amphibious aircraft used to fight forest fires and perform marine rescues. China has completed production of the world's largest amphibious aircraft which will be used to fight forest fires and perform marine rescues. The aircraft, dubbed the AG600, is around the size of a Boeing 737 - far larger than any other plane built to take off and land on water.