Controlled reversal of lake acidification by treatment with phosphate fertilizer

Article Abstract:

A study of Seathwaite tarn, a reservoir in the Lake District, UK, shows that the addition of phosphate fertilizers increases the pH and primary productivity of lakes with low pH of water. Primary production by phytoplankton increases the assimilation of nitrate which makes the lake water basic. The addition of phosphate treatment does not influence the community structure of the lakes significantly. This treatment is most effective if the residence time of the lake is more than one year, the initial pH of water is mildly acidic, and additional nitrate gets in from the atmosphere or catchment.

Usage, Environmental aspects, Lake renewal, Lake District, England, Phosphatic fertilizers, Phosphate fertilizers

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An actively controlled heart valve

Article Abstract:

Issues are presented concerning the function and action of the regulatory intra-cardiac valve in the estuarine crocodile which allows the animal to divert blood away from its lungs.

Physiological aspects, Crocodiles, Heart valves

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Controlled growth factor release from synthetic extracellular matrices

Article Abstract:

A model delivery system is reported that responds to mechanical signalling and can upregulate growth factor release, promoting blood vessel formation.

Models, Growth factors

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