  Similarities between nuclear structure study with many-body theory approach
and nucleon structure calculations with lattice QCD are pointed out. We will
give an example of how to obtain the connected sea partons from a combination
of the experimental data, a global fit of parton distribution functions and a
lattice calculation. We also present a complete calculation of the quark and
glue decomposition of the proton momentum and angular momentum in the quenched
approximation. It is found that the quark orbital angular momentum constitutes
about 50% of the proton spin.

High Energy Physics - Phenomenology;High Energy Physics - Lattice;Nuclear Theory