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S. I. Druzhinin M. V. Rusalov B. M. Uzhinov M. V. Alfimov S. P. Gromov O. A. Fedorova 《Journal of Applied Spectroscopy》1995,62(3):458-461
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 3, pp. 69–72, May–June, 1995. 相似文献
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To whom correspondence should be addressd. 相似文献
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Metalloporphyrins are cofactors of a variety of proteins, and are often used as spectroscopic probes of the active site. Many high resolution techniques, such as single molecule spectroscopy, are based on fluorescence contrast and require the replacement of the native metalloporphyrin by a fluorescent analog. We have investigated the potential of several fluorescent analogs of heme, namely free-base protoporphyrin IX and its metal derivatives containing Zn, Sn, and Mg, for single molecule fluorescence studies by determining their room-temperature molecular absorption cross sections and fluorescence quantum yields. According to these data, free-base protoporphyrin IX and its Zn derivative, which have the highest fluorescence quantum yields, are the most suitable heme analogs for single molecule fluorescence studies. 相似文献
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A detailed physical characterisation of the coherent states and squeezed states of a realq-deformed oscillator is attempted. The squeezing andq-squeezing behaviours are illustrated by three different model Hamiltonians, namely i) Batemann Hamiltonian ii) harmonic oscillator
with time dependent mass and frequency and iii) a system with constant mass and time-dependent frequency. 相似文献
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