At temperatures below 2.1 K, long-lived gaseous Rb atoms in glass cells have been generated with a simple method: irradiating the cells, containing 4He gas and Rb metal, with a cw laser. The obtained atomic Rb density ( approximately 10(8) cm(-3)) decreases with a 1/e time constant of about 10 s at 1.85 K. We have performed optical pumping of the Rb atoms and measured the longitudinal electronic spin relaxation time at 1.85 K as well. For processes (such as Rb-He collisions) which do not remove the atomic Rb from the vapor, this relaxation time is found to be about 60+/-15 s.
Hereditary hemochromatosis (HH) is an inherited disorder usually seen in Northern Europeans, which results in iron overload syndrome. A few cases have also been reported in Japan. We herein report a Japanese man presenting with fever, arthritis, liver dysfunction, and hyperferritinemia who was diagnosed with type 4 HH. He was heterozygous for the 1520A>G (His507Arg) mutation in the ferroportin-1 gene (SLC40A1). He had a familial cataract as an infant, but hereditary hyperferritinemia cataract syndrome was excluded. This is the first report of type 4 HH with juvenile cataracts and suggests that there is an association between hyperferritinemia and early cataract formation.
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