High intensity transient signal

Kleine, P., Perthel, M., Hasenkam, J. M., Nygaard, H., Hansen, S. B., and Laas, J., Downstream turbulence and high intensity transient signals (HITS) following aortic valve replacement writh Medtronic Hall or St. Jude Medical valve substitutes, Eur. J. Cardiothorac. Surg., 2000 17(l) 20-24. 

The performance optimisation of Pb isotope ratio measurements in FI signals by ICP-TOF-MS analysis of Pb aqueous standard solutions was evaluated by Carridn etalP These authors demonstrated that the detection of high intensity transient signals (such as those achieved using USN)... 

Clearly RR is attractive as a technique for detecting intermediates. It has, for example, been very successful with intermediates in organic and bioinorganic reactions (55). Unfortunately the high laser intensities that are needed in RR may be incompatible with the photosensitivity of most organometallic intermediates. For example, in an attempt to detect Cr(CO)5 in solution by RR, the only detectable transient signal was emission from excited Cr atoms (55). 

Lasers are the ideal interrogation sources for TR spectrometry in that they have the narrow line width necessary for discrimination between Raman radiation and elastically scattered light they also have the high intensities required to generate sufficient signal. Some investigators have used two pulsed laser sources one to generate the transients and the other to obtain the TR data. The experiment is... 

Blebs were prepared from spinach chloroplasts by 200-fold dilution. DCMU and an electron donor were added just before measurement. Fluorescence was excited by a high intensity, blue light modulated at 100 kHz. The photomultiplier signal was fed into a lock-in amplifier, transient recorder and signal averager. 

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