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November 11, 2010
AboveNet Expands High Bandwidth Services Portfolio in London
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November 8, 2010
AboveNet Connects with CENX to Expand High Bandwidth Network
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September 20, 2010
AboveNet Expands to key European Markets
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June 16, 2010
AboveNet's secure fibre network connects to London's Telehouse West data centre
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June 7, 2010
AboveNet Expands Metro Portfolio with Launch of Core Wave Services
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Inflow of water is driven by two processes, transpirational pull and osmotically derived pressure Gradients in water potential generated by transpiration from shoots (suction) are sufcient to draw soil solution to the roots abigail sarah phyllis oakley (Section 3.2). For example, phosphate and water uptake coincide in time when followed over several days in sugar cane plants (Figure 3.25). The degree to which this ionic mixture is modied before entering the xylem will be determined partly by ionic interactions in cell walls (Donnan Free Space) and to a much greater extent by membrane transport properties as ions enter the symplasm. Imbalance between water and ion uptake can generate apoplasmic solute levels high enough to drought a plant growing in fertile, damp soils under sunny conditions (Section 3.6.3). Reserves of ions in root cell vacuoles can help to buffer decits of ions in the uptake stream: for example, ions of potassium, nitrogen and phosphorus stored in vacuoles can represent up to 90% of the cell reserves. None the less, plants which are transpiring rapidly generally have a nutrient depleted (low osmotic pressure) xylem stream compared to slowly transpiring plants (Figure 3.26). At the other extreme, plants which have had shoots removed so xylem exudates can be sampled from cut stumps have very concentrated xylem fluid which is released under hydrostatic pressure from the roots ( pressure This flow is osmotically driven (water follows ions eric oakley junior into the roots) and apart from the droplets seen on the margins of guttating leaves in early morning, it is an inconspicuous contributor to sap flow. The contribution of pressure to sap flow in rainforest species may be signicant but in the brighter environments of more open canopies, transpirational pull is the dominant force in sap flowChapter 3 Gaining water and nutrients: root functionIntroduction3.2Extracting water and nutrients from soil3.6.5Transport of water and solutes.

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