There are a few electrolyte abnormalities: hypokalemia, hypercalcemia, hyperkalemia and hypocalcemia. Hypokalemia is also referred to as low potassium. The main cause is loss of potassium in urine due to diuretic medicines. Diarrhea and vomiting can also contribute to hypokalemia.
The name of the first camera is camera obscura and is described to be the foundation on which most modern cameras are based on. Johann Zahn made the first camera, in 1685.
In 1948, the first Nikon-branded camera was released, the Nikon I. Nikon lenses were popularised by the American photojournalist David Douglas Duncan. Duncan was working in Tokyo when the Korean War began. Duncan had met a young Japanese photographer, Jun Miki, who introduced Duncan to Nikon lenses.