Lipoprotein analysis by means of the fluorescence probe 8-anilino-1-naphthalene sulphonic acid (author''s transl)

Single and mixed lipoprotein fractions were successfully analyzed by utilizing the fluorescent propertby of the applied reagent, 8-anilino-naphthalene sulphonic acid. The described method is especially useful for determination of lipoproteins present in high dilution, as found in chromatographic column effluents. The concentration dependence of the developed fluorescence was determined and this served as basis for quantitation. Furthermore, the measured activation spectra show two peaks for each lipoprotein class, the relative intesities being different for each class. The intensity quotient shows a tendency towards linear concentration dependence. Investigation of binary and ternary mixtures showed that the ratio of the two maximum intensities is additive, in contrast to the intensities themselves.     

All‐Optical Operation Cycle on Molecular Bits with 250‐GHz Clock‐Rate Based on Photochromic Fulgides

The prototype operation of an ultrafast write–readout–erase–readout cycle of an all‐optical system based on photochromic indolylfulgides is demonstrated. In the employed dye the molecular structure is switched using light of different wavelengths between two thermally stable states to allow binary encoding of information. Non‐destructive readout of the bit states using infrared light completes the scheme of an all‐optical memory. For ultrafast operation femtosecond light pulses are applied and it is demonstrated that two consecutive write/erase processes separated by less than 4 ps still allow the defined readout of the bit state. The short time between the write/erase and readout actions demonstrates that an all‐optical data storage system based on indolylfulgides may be operated at memory clock rates that exceed 250 GHz.