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Second harmonic generation (SHG) has emerged as an important microscopic contrast agent for noninvasive observation of biological tissues with auto-sectioning and deep penetration capabilities. It has been shown that, with unique polarization dependencies of different molecules, the contrast of SHG reflects local arrangement and the crystallization degree(More)
The time course of resynchronization of the circadian activity rhythm of hamsters was observed following a 10-hr advance or delay in the light-dark cycle (LD 12:12). Twenty-six shift patterns of the lighting schedule were studied; they consisted of continuous (daily), three-step, two-step and one-step shifting. So long as the daily shift of the lighting(More)
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