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Thanks to the wide variety of applications, fluorescence microscopy is now one of the most popular imaging techniques in biology (Weber, 1960; Lakowicz, 1999; Periasamy, 2001; Michalet et al., 2003; Tsien, 2003; Bastiens and Hell, 2004; Taroni and Valentini, 2004; Diaspro et al., 2005). Fluorescence microscopy utilizes fluorescently labeled probes of high biochemical affinity to image the molecular composition and dynamics of biological structures. Moreover, the use of probes that change their fluorescence properties in response to specific physiological parameters enables one to analyze the physiological state of cells or tissues (Birks, 1970; Emptage, 2001; Zhang et al., 2002; Lippincott-Schwartz and Patterson, 2003; Stephens and Allan, 2003). Fluorescence is highly specific either as an exogenous label (e.g., 4’,6-diamidino-2-phenylindole (DAPI) bound to DNA) or an endogenous tracker [(e.g …