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Opt Lett. 2005 Mar 15;30(6):589-91.

In situ determination of refractive index and size of Bacillus spores by light transmission.

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Department of Physics, The City College of New York, New York, New York 10031, USA.


Light-extinction measurements in the wavelength range of 400 to 1000 nm are performed in situ on Bacillus subtilis endospores during heat-shock-induced activation. Simultaneous information on particle size and refractive indices during activation is calculated from the transmission spectra by use of the Gaussian ray approximation of anomalous diffraction theory. During activation the refractive index of the core decreases from 1.51 to 1.39, and the size increases from 0.38 to 0.6 microm.

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