Figure 4
From: Anisotropic shrinkage of insect air sacs revealed in vivo by X-ray microtomography
The transverse velocity fields at the 110th, 180th and 290th slices of the air sac at the moment of the 25th second from the start of the experiment.
The maximum black regions in the middle of these three slices are the transverse sections of the air sac. The red arrow represents the direction of motion; the length represents the value of speed. (a) The transverse velocity fields of the 110th slice. The velocity vectors at the top left corner of the air sac show an outward trend, while velocity vectors at the bottom right corner are nearly zero. The other portions of this section show an expanding process with moderate speed. (b) The transverse velocity fields of the 180th slice. The compression portion is located at the bottom right corner and the inflation portion is located at the top right corner. Other velocity vectors are nearly zero. (c) The transverse velocity fields of the 290th slice. The left edge of the air sac exhibits a shrinking trend, while other portions are nearly still.
