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| Section2 = }} Nile blue (or Nile blue A) is a stain used in biology and histology. It may be used with live or fixed cells, and imparts a blue colour to cell nuclei. It may also be used in conjunction with fluorescence microscopy to stain for the presence of polyhydroxybutyrate granules in prokaryotic or eukaryotic cells. Boiling a solution of Nile blue with sulfuric acid produces Nile red (Nile blue oxazone). ==Chemical and physical properties== Nile blue is a fluorescent dye. The fluorescence shows especially in nonpolar solvents with a high quantum yield. The absorption and emission maxima of Nile blue are strongly dependent on pH and the solvents used:〔 The duration of Nile blue fluorescence in ethanol was measured as 1.42 ns. This is shorter than the corresponding value of Nile red with 3.65 ns. The fluorescence duration is independent on dilution in the range 10−3–10−8 mol/L.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nile blue」の詳細全文を読む スポンサード リンク
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