Comparisons of Quark and Gluon Jets

A summary of the latest results of the DELPHI Collaboration on the properties of identified quark and gluon jets is given. It covers the measurement of the fragmentation functions of gluons and quarks and their scaling violation behaviour as well as an analysis of the scale dependence of the multiplicities in gluon and quark jets. Further, a precision measurement of $C_A /C_F$ from the multiplicities in symmetric three jet events is discussed. The charged hadron multiplicity in a cone perpendicular to the event plane of symmetric three jet events is analysed. A precise measurement of inclusive distributions of $\pi^+, K^+$, and p and their antiparticles in gluon and quark jets has been performed. The study of isoscalar resonance production shows no indication for an excess of $\phi$ ¢(1020) production in gluon jets.