Search results
Results from the WOW.Com Content Network
The alternative oxidase is an integral monotopic membrane protein that is tightly bound to the inner mitochondrial membrane from matrix side [18] The enzyme has been predicted to contain a coupled diiron center on the basis of a conserved sequence motif consisting of the proposed iron ligands, four glutamate and two histidine amino acid residues. [19]
Polar auxin transport (PAT) is directional and active flow of auxin molecules through the plant tissues. The flow of auxin molecules through the neighboring cells is driven by carriers (type of membrane transport protein) in the cell-to-cell fashion (from one cell to other cell and then to the next one) and the direction of the flow is determined by the localization of the carriers on the ...
The phloem is the living portion of the vascular system of a plant, and serves to move sugars and photosynthate from source cells to sink cells. Phloem tissue is made of sieve elements and companion cells, and is surrounded by parenchyma cells. The sieve element cells work as the main player in transport of phloem sap.
Phloem (/ ˈ f l oʊ. əm /, FLOH-əm) is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and known as photosynthates, in particular the sugar sucrose, [1] to the rest of the plant. This transport process is called translocation. [2]
The transport is passive, not powered by energy spent by the tracheary elements themselves, which are dead by maturity and no longer have living contents. Transporting sap upwards becomes more difficult as the height of a plant increases and upwards transport of water by xylem is considered to limit the maximum height of trees. [11]
A typical plant cell may have between 1,000 and 100,000 plasmodesmata connecting it with adjacent cells [11] equating to between 1 and 10 per μm 2. [ 12 ] [ failed verification ] Plasmodesmata are approximately 50–60 nm in diameter at the midpoint and are constructed of three main layers, the plasma membrane , the cytoplasmic sleeve , and ...
The transport of water along this pathway occurs in components, variously defined among scientific disciplines: Soil physics characterizes water in soil in terms of tension , Physiology of plants and animals characterizes water in organisms in terms of diffusion pressure deficit , and
Transport velocity is higher (transport is faster) in the apoplast than in the symplast. [9] This method of transport also accounts for a higher proportion of water transport in plant tissues than does symplastic transport. [10] The apoplastic pathway is also involved in passive exclusion.