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.
A U.S. Navy Grumman Panther of the kind used to shoot down 4 Russian MiG 15s on Nov 18. 1952. (U.S. Navy) A Russian Su-24 Fencer, a multi-role attack aircraft, was shot down by Turkish F-16s while reportedly flying in Turkish airspace Tuesday.