icom lez 4 bioenergetica
DESCRIPTION
biochemistry lessonTRANSCRIPT
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METABOLISMOENERGETICO
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METABOLISMO
NADH
FADH2
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BIOENERGETICA
� STUDIO QUANTITATIVO DELLE
TRASDUZIONI ENERGETICHE
CHE AVVENGONO NELLE CELLULE
E DELLA NATURA E DELLA
FUNZIONE DEI PROCESSI
CHIMICI ALLA BASE DI QUESTE
CONVERSIONI DI ENERGIA
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VIVENTE =SISTEMA TERMODINAMICO
APERTO
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LEGGI TERMODINAMICHE� I legge ∆∆∆∆E= Q-W(lavoro)
W = Q- ∆∆∆∆E
� II legge IN TUTTI PROCESSI
NATURALI, L’ENTROPIA (∆∆∆∆S) TENDE
AD AUMENTARE
∆∆∆∆G = ∆∆∆∆H -T ∆∆∆∆S
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∆∆∆∆G = ∆∆∆∆H-T∆∆∆∆S
� ∆∆∆∆G= ENERGIA LIBERA DI GIBBS
= QUANTITA’ DI ENERGIA IN GRADO DI
PRODURRE LAVORO (ENERGIA CONTENUTA
NEI LEGAMI CHIMICI)
� ∆∆∆∆H= VARIAZIONE DI ENTALPIA
(CONTENUTO TERMICO) DEL SISTEMA
� T = TEMPERATURA ESPRESSA IN GRADI
KELVIN
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ESOERGONICA/ENDOERGONICA
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ESOTERMICA /ENDOTERMICA
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+3.3
-7.3
-4.0
SE SI ACCOPPIA UNA REAZIONE
ESOERGONICA CON UNA ENDOERGONICA
TALE CHE IL ∆G FINALE SIA NEGATIVO, LA
REAZIONE COMPLESSIVA E’ POSSIBILE
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ATP
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REAZIONI REDOX
IL FLUSSO DI ELETTRONI NELLE
REAZIONI DI OSSIDO-RIDUZIONE E’
RESPONSABILE DIRETTAMENTE O
INDIRETTAMENTE DI TUTTO IL LAVORO
PRODOTTO DAGLI ORGANISMI VIVENTI.
ARID + BOX AOX + BRID
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DEIDROGENAZIONI
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ALIMENTI OSSIDABILI
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NAD/NADH(H) FAD/FADH2
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REAZIONI REDOX
ARID + BOX AOX + BRID
ALIMENTI SCARTI
ALIMENTARI
NAD+ NADHFAD+ FADH2?????
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BIOENERGETICA
� COME SI FORMA L’ATP ??????
� DOVE E COME SI RIOSSIDANO
I COENZIMI RIDOTTI ???
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FOSFORILAZIONE OSSIDATIVA
PROCESSO MITOCONDRIALE IN
CUI L’OSSIDAZIONE DI
COENZIMI RIDOTTI NELLA
CATENA RESPIRATORIA SI
ACCOPPIA ALLA
FOSFORILAZIONE DI ADP in ATP
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MITOCONDRI
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CATENA RESPIRATORIA
LA CATENA
RESPIRATORIA E’ UN
COMPLESSO PROTEICO
DI TRASPORTATORI DI
ELETTRONI, DEPUTATO
AL TRASFERIMENTO
SEQUENZIALE DEGLI
ELETTRONI DAI COENZIMI
RIDOTTI ALL’OSSIGENO
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CATENA RESPIRATORIA
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GRADIENTE
ELETTROCHIMICO
Energia Elettrica Iniziale
=
Energia Elettrica Finale
-
Energia per compiere
lavoro
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FOSFORILAZIONE OSSIDATIVA
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ATP- sintetasi
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Film filamento
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Film
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http://www.youtube.com/watch?v=xbJ0nbzt5Kw&feature=related
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TRASPORTO ATP/ADP
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