Myelosuppression - a decrease in the production of blood cells, which may lead to low blood count. Pancytopenia - a lowering of all three types of blood cells; red blood cells, platelets, and white blood cells, which may lead to low red blood cell count, low blood platlet count, and/or low white blood cell count.
Helium is used as a cooling medium for the Large Hadron Collider (LHC), and the superconducting magnets in MRI scanners and NMR spectrometers. It is also used to keep satellite instruments cool and was used to cool the liquid oxygen and hydrogen that powered the Apollo space vehicles.
Electrical generators use the gas as a rotor coolant. The element is relied upon in many manufacturing plants to check for leaks. Hydrogen can be used on its own or with other elements. Other applications include fossil fuel processing and ammonia production. Ammonia is part of many household cleaning products. It is also a hydrogenating agent used to change unhealthy unsaturated fats to saturated oils and fats.