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.
How To Record. 1  Open Audacity. 2  In the top menu, look for the drop-down box whose default value is MME. 3  Immediately on the right, select Rec Playback.  You can now start 1  recording. As soon as your are done with the call, click the button with a square to end the recording.  You can check what has been recorded by playing the audio back immediately.