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Data taken over the last several years have demonstrated that RHIC hascreated a hot, dense medium with partonic degrees of freedom. Identifiedparticle spectra at high transverse momentum ($p_T$) and heavy flavor arethought to be well calibrated probes thus serve as ideal tools to study theproperties of the medium. We present $p_T$ distributions of particle ratios inp+p collisions from STAR experiment to understand the particle productionmechanisms. These measurements will also constrain fragmentation functions inhadron-hardon collisions. In heavy ion collsions, we highlight: 1) recentmeasurements of strange hadrons and heavy flavor decay electrons up to high$p_T$ to study jet interaction with the medium and explore partonic energy lossmechanisms; and 2) $\Upsilon$ and high $p_T$ $J/\psi$ measurements to study theeffect of color screening and other possible production mechanisms.

Production and energy loss of strange and heavy quarks