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Chapter 10: Infrared and Raman microscopy in cell biology Matthaus C; Bird B; Miljkovic M; Chernenko T; Romeo M; Diem MMethods Cell Biol 2008[]; 89 (ä): 275-308This chapter presents novel microscopic methods to monitor cell biological processes of live or fixed cells without the use of any dye, stains, or other contrast agent. These methods are based on spectral techniques that detect inherent spectroscopic properties of biochemical constituents of cells, or parts thereof. Two different modalities have been developed for this task. One of them is infrared micro-spectroscopy, in which an average snapshot of a cell's biochemical composition is collected at a spatial resolution of typically 25 mum. This technique, which is extremely sensitive and can collect such a snapshot in fractions of a second, is particularly suited for studying gross biochemical changes. The other technique, Raman microscopy (also known as Raman micro-spectroscopy), is ideally suited to study variations of cellular composition on the scale of subcellular organelles, since its spatial resolution is as good as that of fluorescence microscopy. Both techniques exhibit the fingerprint sensitivity of vibrational spectroscopy toward biochemical composition, and can be used to follow a variety of cellular processes.|Cells/*metabolism/ultrastructure[MESH]|HeLa Cells[MESH]|Humans[MESH]|Microscopy/*methods[MESH]|Spectrophotometry, Infrared/*methods[MESH]|Spectrum Analysis, Raman/*methods[MESH] |
