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Transport Processes, ATP energy source, Potein as an important component,…
Transport Processes
Long-Distance Transport: Phloem
Pressure flow hypothesis
Membrane-bound molecular pump
Active transport
Sources
Polymer trap mechanism
STM/CC complex
Mass transfer
Specific mass transfer
Sinks
P-Protein
#
P-protein plug
Callose
Water Potential
Chemical potential
Very important
Free energy of water
Energy change
Increase
Heated
Decrease
Cooled down
Three components
Pressure potential
Measured in megapascals (MPa) or bars
Osmotic potential
Matric potential
Incipient plasmolysis
Cell plasmolyzed
Concept
Fundamental aspect
Ability to transport specific substance
Moving molecules
After death
Diffusion from higher to lower concentration
Ions
Molecules
Atom
Protoplasm decay
Disorder of the components increase
During life
Diffusion
More slower
Controlled and Oriented
Tansport processes
Comsume energy
#
Driven by exergonic breaking of ATP's
Isolation mechanisms
Trasport process
Short-distance transport
Long-distance transport
Short-Distance Intercellular Transport
Guard Cells
Opening ans closing of stomatal pores
At night closed stomata
At day open stomata
Symplast
Continuous mass
All of the protoplasm of one plant
Apoplast
The wall and the intercellular spaces
The two together
Motor Cells
https://www.sciencedirect.com/science/article/pii/S0014579307003729
Transfer cells
Smooth outer cell
Numerous fingerlike and ridgelike outgrowths on the inner surface
Found in areas where rapid short-distance transports occur
Diffusion, Osmosis, and Active Transport
Diffusion
Random movement of a particle
From high to low concentration
Osmosis
Diffusion through a membrane
Membranes
Types
Completely impermeable
Doesn't allow anything to pass through
Occur as issolation barrier
Selectively permeable
Differentially permeable
Lipid/protein cell membranes
Allow only certain substances to pass
Freely permeable
Allows all solutes
Little biological significance
Aquaporins
Water movement
Pass through all the membranes
Rapid movement
Protein channels
Active Transport
Molecular pumps
Use of ATP to force molecules across the membrane
Protein binds to the molecule and ATP
Intracellular transport
Vesicles
Relatively permament
Vesicles migrate through cytoplasm
Fuse with another organelle
Fusion
Transfer of content into organelle
Cell and water Movement
Lysis
Anti-lysis
Incipient plasmolysis
Cell plasmolyzed
Sometimes severe water loss
Desiccation
Long-Distance Transport: Xylem
Water Transport Through Xylem
Ttranscuticular transpiration
Pressure Potential
#
transstomatal transpiration
Cavitation
Cohesion-tension hypothesis
Embolism
Control of Water Transport by Guard Cells
Properties of Water
Cohesive
Adhesive
ATP energy source
Potein as an important component
Pressure potential in trasport mechanism
