Isotropic bands indicate the behavior of polarized light as it passes through I bands.

His name is also associated with "Krause's membranes", which are isotropic bands in striated muscle fiber that consist of disks of sarcoplasm and connect the individual fibrils.

In physiology, isotropic bands are skeletal muscle cells (a.k.a. muscle fibers) that form the light bands (I bands) that contribute to the striated pattern of the cells.

Focusing on the visible bands of fibers in the muscles, he noted that the volume of the anistropic band increased during contraction, whereas the volume of the isotropic band decreased.