An optical module in a simple configuration is provided which can suppress optical crosstalk due to leakage light without causing characteristics deterioration and reliability decrease of light-emitting elements to thereby obtain appropriate light receiving sensitivity. These methods include introducing reductant in to catalytic components requiring regeneration in series of discreet portions during a Scheduled Regeneration Event. The invention further relates to methods for producing the lettuce cultivar, represented by lettuce variety 81-97 RZ. Such compositions are useful for the treatment of cancer, arthritis, and diseases related to angiogenesis. The biasing member is used in moving a first drawer slide member to a closed position relative to a second drawer slide member, and use of the gear and the resulting mechanical advantage provide a smoother transition when the first drawer slide member is engaged or disengaged from the closing device. In the method of the invention an integrated signal is measured across a scan window including one or more channels using an integrating detector.