F08-BCH361-L17a

F08-BCH361-L17a - Bioenergetics: the importance of energy...

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Unformatted text preview: Bioenergetics: the importance of energy changes conversion of potential energy of water into kinetic energy in a waterfall Where does the energy for life on earth comes from??? famous experiment of Gallilei with the cannonball: potential energy is provided by the work of Gallilei (oxidation of nutrients), when he brings the cannonball up to the top of the tower of Pisa potential energy kinetic energy heat, change of the conformation of the floor energy conversion Energy can not be consumed or produced: it can be only converted from one form of energy into another form of energy First law of Thermodynamics The entropy (i.e. the disorder) in the universe increases Second law of Thermodynamics Ludwig Boltzmann (1844-1906) “Gedankenexperiment”: A less well ordered state is more probable than an ordered state only one option for all molecules located in the violet area, whereas 6 options exist for an equal distribution of the molecules between the two halves S = k lnW W number of possible arrangments (German, “Wahrscheinlichkeit”) k Boltzmann constant k = R (ideal gas constant)/ N (Avogadro’s number of molecules in one mole (6.023 x 10 23 ) Is the existence of highly ordered living organisms in contradiction to the second law of thermodynamics ? !!!!!!!!!!!!!!!!!!!!!!NO!!!!!!!!!!!!!!! gas It is not possible to measure the absolute values of energy, only changes in energy that occur during a process can be detected....
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This note was uploaded on 09/30/2011 for the course BCH 361 taught by Professor Fromme during the Fall '08 term at ASU.

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F08-BCH361-L17a - Bioenergetics: the importance of energy...

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