Alternating the field strength and direction back and forth creates an average force on the DNA that defines the direction it should take.The key point behind the device is that the alternating fields affect long and short molecules differently.
Jumping sequences don't cover much space; instead they keep changing direction back and forth, covering the same little patch with the involuntary and insistent tone that characterizes Mr. Naharin's choreography.
In Footfalls, a woman named May, in Beckett's typically exacting stage directions, "paces back and forth, nine steps within a one-metre stretch.
They note that the World Trade Center moves as much as 2 feet at the top but say that occupants often do not notice the movement because it is slow and in one direction, rather than a back-and-forth swaying.
When tracks need to cross one another, they drop down or rise up to another wiring layer like an office worker going upstairs, across the building and back down again, to get around a blocked corridor.All the tracks on the first layer run in one back-and-forth direction.
The Labview program also controlled merging of droplet pairs and the back-and-forth flow direction changes for the detection of absorbance over time.
A clear anticlockwise rotation is seen in a plane nearly perpendicular to the YZ plane as a whole, with occasional back-and-forth changes in direction.
In this back-and-forth motion, the current flows in one direction and then in another.
In this case, hold each half in one hand, and gently rotate the halves in opposite directions, then rotate back and forth each time applying a bit more pressure and simultaneously exerting pressure to move the halves away from each other.
The back-and-forth continues for weeks.
