Chignon (hairstyle) traced back to ancient Greece, where Athenian women commonly wore the style with gold or ivory handcrafted hairpins. Athenian men wore the style as well, but they fastened their chignons with a clasp of "golden grasshoppers", according to "The History of the Peloponnesian War", by Thucydides. The chignon was specific to Athens, as other city states, such as Sparta and Cyprus, had their own style of hairdressing. The chignon was also popular in ancient China, where married women wore the low, knotted hairstyle. Male writers of the Victorian era, like Anthony Trollope, were fond of poking fun at the absurdity
BUN-to-creatinine ratio BUN-to-creatinine ratio In medicine, the BUN-to-creatinine ratio is the ratio of two serum laboratory values, the blood urea nitrogen (BUN) (mg/dL) and serum creatinine (Cr) (mg/dL). Outside the United States, particularly in Canada and Europe, the truncated term urea is used (though it is still the same blood chemical) and the units are different (mmol/L). The units of creatinine are also different (μmol/L), and this value is termed the urea-to-creatinine ratio. The ratio may be used to determine the cause of acute kidney injury or dehydration. The principle behind this ratio is the fact that both urea (BUN) and creatinine