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Infrared to visible frequency up-conversion with efficiency as large as 377 percent and real-time storage of nanosecond pulses for a few tenths of a millisecond have been simultaneously achieved in a BDN organic dye solution in toluene. Two remarkable effects influencing the four-wave mixing (FWM) efficiency are found: (1)transient energy transfer between writing beams, and (2) the time matching between reading beam and the molecular relaxation time of medium. The full frequency-domain absorption characteristic and full time-domain storage characteristic of BDN have been studied in detail. The experimental results are identical to preliminary theoretical analysis.