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TRANSPORT
TRANSMEMBRAN
DWI NOVITASARI
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Transfer of material and informationacross membranes
1. Cross-membrane movement of small molecules Diffusion (passive and facilitated) Active transport2. Cross-membrane movement of large molecules Endocytosis Exocytosis3. Signal transmission across membranes ell surface receptors
!" Si#nal transduction (e#$ #luca#on % cA&')" Si#nal internaliation (coupled *it+ endocytosis$ e#$t+e
,D, receptor) &ove-ent to intracellular receptors (steroid +or-ones. a
for- of diffusion)4. Intercellular contact and communication
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Difusi sederhana
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Difusi terfasilitasi
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T+ree types of carrier/-ediated transport
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KLASIFIKASI SISTEM TRANSPORT
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Trasnortasi asif
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One !a" in !hich a #lucose carrier canbe dri$en b" a Na% #radient&
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KLASIFIKASI TRANSPORTER
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Difusi b" channels proteins
Channels proteins memun"ai ' sifat(
Ion)selecti$e ermiabel
Gated channels can be *uctuate
bet!een oen and closed
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Transort ion natrium dan +alium melalui saluran rotein
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The #atin# of ion channels
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Transport aktif :
(a) coupled carrier:
gerakan elektron
(b) ATP-driven:
hidrolisis ATP
(c) light-driven:
energi cahaya
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Transortasi a+tif
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Endositosis
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E+sositosis
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Endositosis danE+sositosis
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Si#nal internali,ation