PHOTOCHEMICAL UTILIZATION OF LIGHT ENERGY

Non-photochemical quenching. A response to excess light energy.

Plants and algae have a love/hate relationship with light. As oxygenic photoautotrophic organisms, they require light for life; however, too much light can lead to increased production of damaging reactive oxygen species as byproducts of photosynthesis. In extreme cases, photooxidative damage can cause pigment bleaching and death, a phenomenon all too familiar to anyone who has tried to move a ...

Photochemical Conversion of Solar Energy

Suppressing photochemical reactions with quantized light fields

Photoisomerization, that is, a photochemical reaction leading to a change of molecular structure after absorption of a photon, can have detrimental effects such as leading to DNA damage under solar irradiation, or as a limiting factor for the efficiency of solar cells. Here, we show that strong coupling of organic molecules to a confined light mode can be used to strongly suppress photoisomeriz...

geotherld8.1 energy part 3 . energy utilization

geothermal energy because of its versatility has extensive applications in power generation, industry, agriculture, treatment of diseases etc: ...this source of energy has received great attention in recent years many countries in the world are benefiting from it. it possesses an eternal heat source and is pollution free. in this article it is tried to demonstrate the importance of georhermal e...

The photochemical production of gold sols using artificial light.

Twenty years ago (Fowweather, 1928) a method for the preparation of gold sols for the Lange test on cerebrospinal fluids was published in which gold potassium bromide is reduced by potassium oxalate under the action of daylight. Temperature and light intensity were found to be complementary to some extent; thus it was found advisable to carry out the reaction at a somewhat raised temperature in...