ultrastructure; fine structure; microstructure
In biology, refers to the detailed structure of cells and tissues visible only under an electron microscope.
Observe the ultrastructure of cells with an electron microscope.
fine structure
In physics, typically refers to the splitting of spectral lines due to relativistic effects and electron spin.
原子スペクトルの微細構造は、電子のスピン軌道相互作用によって生じる。
The fine structure of atomic spectra arises from spin-orbit interaction of electrons.