idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
Elektrochemische Rastermikroskopie: Forscher bringen eine Mikroelektrode (grau) in die unmittelbare Nähe der Zelle. An der Elektrode wird Sauerstoff zu Wasser umgesetzt (schwarzer Pfeil); dabei fließen Elektronen durch die Elektrode. Durch Zellatmung (grüner Pfeil) verbraucht die Zelle Sauerstoff und macht der Elektrode Konkurrenz. Zusätzliche Sauerstoffquellen können die Messung stören: Sauerstoff kann aus der umgebenden wässrigen Lösung in den Spalt zwischen Elektrode und Zelle wandern (grauer Pfeil) oder aus der Zelle austreten (blaue Pfeile). Oben links ist die Topographie, also das Höhenprofil, der Zelle gezeigt, oben rechts der gemessene Sauerstoffverbrauch an der Zelloberfläche.
Grafik: Wolfgang Schuhmann
(341 KB, 1383 x 1057 pixels)
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