. Cella chimica; una raccolta di carte dedicato a Otto Warburg in occasione del suo settantesimo compleanno. Warburg, Otto Heinrich, 1883-; biochimica. VOL. 12 (1953) Biochimica et BlOPHYSICA ACTA 347 una dimostrazione di Elettrochimica del ciclo dell'energia e la massima resa quantica nella fotosintesi* da KURT DAMASCHKE, FRITZ TODT, DEAN BURK** e OTTO WARBURG Istituto Max Planck per la fisiologia cellulare, e materiale-prufungsamt, Berlin-Dahlem (Germania) un nuovo e rapido metodo elettrochimico con un periodo di tempo di meno di un secondo è stato applicato ad uno studio di scambi di ossigeno che si verificano in Chlo

• Collaboratore: Library Book Collection / Alamy Foto Stock
• ID dell’immagine: RJBE8X
• Dimensioni dei file: 7,2 MB (510,3 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 1405 x 1779 px | 23,8 x 30,1 cm | 9,4 x 11,9 inches | 150dpi

Altre informazioni

Questa foto è un'immagine di pubblico dominio, il che significa che il copyright è scaduto o che il titolare del copyright ha rinunciato a tale diritto. Alamy addebita un costo per l'accesso alla copia ad alta risoluzione dell'immagine.

Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.

. Cell chemistry; a collection of papers dedicated to Otto Warburg on the occasion of his 70th birthday. Warburg, Otto Heinrich, 1883-; Biochemistry. VOL. 12 (1953) BIOCHIMICA ET BlOPHYSICA ACTA 347 AN ELECTROCHEMICAL DEMONSTRATION OF THE ENERGY CYCLE AND MAXIMUM QUANTUM YIELD IN PHOTOSYNTHESIS* by KURT DAMASCHKE, FRITZ TODT, DEAN BURK** and OTTO WARBURG Max Planck Institute for Cell Physiology, and Material-prufungsamt, Berlin-Dahlem (Germany) A new and rapid electrochemical method with a time period of less than one second has been applied to a study of the oxygen exchanges occurring in Chlorella cultures during varying periods of darkness and of illumination with measured quantities of visible light. It has been possible to show that an initial photochemical reaction takes place with a high quantum efficiency, and that this photo reaction is followed by a back reaction of enhanced oxygen consumption with a time period that may vary from seconds to a few minutes. The overall efficiency of net oxygen production in this cycle approaches, under suitable experi- mental conditions, the theoretical limit set by the first and second laws of thermodynamics, namely, 2.5 to 3 quanta of light per molecule of oxygen gas produced. METHODS The electrochemical measure- ment of dissolved oxygen was carried out by the method of Todt^-^ in glass vessels of the type illustrated in Fig. I. Such vessels had a volume of 80 ml or more, and a diameter of 6 cm, and hence an area of 28 cm^ on the bottom surface, which the measured light entered and covered to the extent of at least 95 %. At the top edge of a given vessel there were three inlets with glass-ground joints, two inlets for holding electrodes, and a third inlet for holding either a simple stopper or a microburette used in connection with electrode „. t^ 1 ^ , ^ , • , . l-ig. I. Vessel for electrochemical measurement of calibration lor oxygen response. oxygen exchange in photosynthesis and respiration. * The substance of this

Parole chiave associate all'immagine

• bookcentury1900
• bookcollectionbiodiver
• booksubjectbiochemistry