  The study of the differences of the fragmentation of quarks and gluons to
jets of hadrons gives insight into the fundamental structure of QCD. Results
from different approaches to properties of quarks and gluons are shown. The
colour factor ratio $C_A/C_F$ is measured in agreement with the QCD prediction.
Identified particles in quark and gluon jets are investigated, revealing no
overproduction of isoscalar $\eta^0$ and $\phi(1020)$ in gluon jets, but an
excess of protons.
