Biological systems, picosecond

Biological systems, picosecond spectroscopy, 201-20 Blood, copper and zinc analyses, 112 Blooming... 

The trend evident in the past few years towards the study of increasingly complex systems has continued, particularly heterogeneous systems related to solar energy exploitation and biological systems. The effects of what are now well-established techniques for studying very fast processes in the picosecond time scale are now part of almost routine investigations in photophysics. 

Picosecond Spectroscopy and Applications to Chemical and Biological Systems... 

The first picosecond studies on rhodopsin and possibly of any biological system were performed by Busch et al.," who studied the kinetics of the first photoinduced intermediate of rhodopsin, bathorhodopsin at room... 

Eck V./Josef Holzwarth, A. Genz Iodine Laser Temperature J.F. Holzwarth, V. Eck, A. Genz, Iodine Laser Temperature Jump from Picoseconds to Seconds Relaxation Processes of Phospholipid Bilayers. In Bayley, P.M./R. Dale (Eds.), Spectroscopy and Dynamics of Biological Systems, London 1984, p. 351-377. 

The system is based on the ability of a classical single-shot autocorrelator, widely used to measure the duration of picosecond and femtosecond laser pulses, to operate a time-to-space conversion [14], After being reflected by a biological sample, a probe pulse supports a temporal stretching due to the different internal reflections occurring at different depths. In the nonlinear crystal, if the backscattered probe pulse interacts with the pump pulse in a non-collinear configuration, the temporal stretching can be converted into a spatial stretch-... 

In order to appreciate more fully the Impact that video imaging systems have had on measurements In Picosecond Spectroscopy some data obtained with the above techniques will now be presented covering various areas of Interest In Physics, Chemistry,and Biology. 

In summary, we have combined state of the art optical multichannel analyzer techniques with well established low repetition rate picosecond laser technology to construct an instrument capable of measuring transient spectra with unprecedented reliability. It is, in its present form, a powerful tool for the investigation of ultrafast processes in biological, chemical, and physical systems. We foresee straightforward extension of the technique to the use of fourth harmonic excitation (at 265 nm) and also a future capability to study gaseous as well as condensed phase samples over a more extended spectral range. 

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