A

Fig. 7.21 Salinity dependent accumulation of poly-ols and correlated increase of potential quantum yield of photosystem II (Fv/Fm) after 30 min of dark adaptation in gametophytes of the mangrove fern Acrostichum aureum. (Closed circles total polyols, open circles d-pinitol; errors are SE) (A), correlation of polyol and Na+ concentration in the tissue (B, C), gametophytes grown under the external salinities indicated by the absicissa in (B) and then transferred to 340 mM NaCl for two days. Hardening by growth at increased salinity (A) is demonstrated by

150 200 250 300 350 Tissue Na+-concentration (mM)

150 200 250 300 350 Tissue Na+-concentration (mM)

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Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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