Identification of specific effect of chloride on the spectral properties and structural stability of multiple extracellular glutamic acid mutants of bacteriorhodopsin - Lazarova, Tzvetana (Universitat Autònoma de Barcelona. Departament de Bioquímica i de Biologia Molecular) ; Mlynarczyk, Krzysztof (University of Warsaw. Faculty of Chemistry) ; Querol Murillo, Enrique (Universitat Autònoma de Barcelona. Institut de Biotecnologia i de Biomedicina "Vicent Villar Palasí") ; Tenchov, Boris (Medical University (Sofia, Bulgària). Department of Medical Physics and Biophysics) ; Filipek, Slawomir (University of Warsaw. Faculty of Chemistry) ; Padrós, Esteve (Universitat Autònoma de Barcelona. Departament de Bioquímica i de Biologia Molecular)