Geyser - Eruptions. 1  Steam rises from heated water. 2  Pulses of water swell upward. 3  Surface is broken. 4  Ejected water spouts upward and falls back down into the pipe. 5  Geyser activity, like all hot spring activity, is caused by surface water gradually seeping down through the ground until it meets rock heated by magma.
From Wikipedia, the free encyclopedia. A tophus (Latin: stone, plural tophi) is a deposit of uric acid crystals, in the form of monosodium urate crystals, in people with longstanding hyperuricemia (high levels of uric acid in the blood). Tophi are pathognomonic for the disease gout.hen uric acid levels and gout symptoms cannot be controlled with standard gout medicines that decrease the production of uric acid (e.g., allopurinol, febuxostat) or increase uric acid elimination from the body through the kidneys (e.g., probenecid), this can be referred to as refractory chronic gout (RCG).
Rheumatoid arthritis and gout are two different forms of arthritis that can affect the joints of the fingers to create swelling and pain. So called gouty tophi are bumps from the disease gout, whereby uric acid crystals are deposited in the joints, causing painful attacks, often at night time.