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.
July 2, 1950 - The only pure naval action in which an American warship was involved in during the Korean War was fought off Chumunkin, on the east coast, when four North Korean torpedo boats attacked the cruisers USS Juneau (CL 119) and HMS Jamaica and the frigate HMS Black Swan.