Our group possesses the X- and Q-Band CW ESR capabilities as well as a pulsed Q-Band spectrometer equipped with ENDOR and SpinJet AWG. These spectrometers are freely accessible to external users for collaborative and research purposes. In addition, we cooperate with AG Bittl, which gives us direct access to several additional ESR spectrometers (S-, X-, Q- and W-Band) having both dipolar- and hyperfine spectroscopy capabilities. Our sample preparation laboratories are fully equipped with modern instruments for membrane protein biochemistry and biophysics.