This paper presents an all fiber optic endoscope system working in double modalities of normal imaging and fluorescence spectrum analysis, for the diagnosis of colon cancer. A coherent laser source is used here for providing the simultaneous illumination (for normal imaging mode) and excitation of fluorophores (for fluorescence spectrum analysis mode). The design aspects of the fiberscope dista...

Action spectra for the assimilation of nitrate and nitrite have been obtained for several blue-green algae (cyanobacteria) with different accessory pigment composition. The action spectra for both nitrate and nitrite utilization by nitrate-grown Anacystis nidulans L-1402-1 cells exhibited a clear peak at about 620 nanometers, corresponding to photosystem II (PSII) C-phycocyanin absorption, the ...

Recently the importance of measuring in vivo action spectra for photodynamic therapy (PDT) with various photosensitizers was pointed out in this journal [1]. It was shown that the effect of PDT with zinc phthalocyanine tetrasulphonic acid (ZnPcS4) increases considerably when the wavelength of the activating light is increased from 680 to 692 nm. In this regard a further comparison with haematop...

The fluorescence detection of ultra high energy cosmic rays requires a detailed knowledge of the fluorescence light emission from nitrogen molecules over a wide range of atmospheric parameters, corresponding to altitudes typical of the cosmic ray shower development in the atmosphere. We have made a precise measurement of the fluorescence light spectrum excited by MeV electrons in air. The relat...

It has been reported that shifts in the fluorescence emission spectrum of the introduced tryptophans in the F155W mutant of Escherichia coli F1 (bovine heart mitochondria F1 residue number) can quantitatively distinguish between the number of catalytic sites occupied with ADP and ATP during steady-state ATP hydrolysis (Weber, J., Bowman, C., and Senior, A. E. (1996) J. Biol. Chem. 271, 18711–18...