INFLUENZAVIREN (VIROLOGIE); INFEKTIONSPROZESS + VIRUSREPRODUKTION (VIROLOGIE); RIBONUKLEOPROTEINKOMPLEXE (MOLEKULARE GENETIK); VIRUS-WIRTSZELLE WECHSELWIRKUNGEN (VIROLOGIE); MEMBRANFUSION (MEMBRANBIOLOGIE); AUSWIRKUNG DES PH-WERTES AUF BIOLOGISCHE SYSTEME (BIOLOGIE); INFLUENZA VIRUSES (VIROLOGY); VIRAL INFECTION PROCESS + VIRUS REPRODUCTION (VIROLOGY); RIBONUCLEOPROTEIN COMPLEXES (MOLECULAR GENETICS); VIRUS-HOST CELL INTERACTIONS (VIROLOGY); MEMBRANE FUSION (MEMBRANE BIOLOGY); INFLUENCE OF PH VALUE ON BIOLOGICAL SYSTEMS (BIOLOGY)