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.
When recording Replay Video shows the actual achieved frame rate next to the preset rate in the Status window (for example 29/27 or 29/31 - the first number is the preset rate 29.97 the second is the actual achieved frame rate). Make sure the actual frame rate does not go much lower.