SACs are those genes with expression up-regulated during leaf senescence. Class I SACs are expressed only during senescence (senescence-specific). Class II SAGs have a basal level of expression during early leaf development, but this level increases during senescence.
Which Sample Rate to use. 44.1 kHz. 44.1 kHz (44100 Hz) is the sampling rate of audio CDs giving a 20 kHz maximum frequency. 20 kHz is the highest frequency generally audible by humans, so making 44.1 kHz the logical choice for most audio material.
What is Bit Rate? Every time you record, export, or watch a video, bit rate has a lot to do with the quality. Learn what bit rate is and how it affects file size, image quality, accessibility, and delivery cost. Plus find out the difference between CBR and VBR. Wolfram|Alpha Bit Rate Calculator.