Articles about Photosynthesis - tribunedigital …

Other bacteria use sunlight for different chemical purposes. Splitting water — as plants do — requires a lot of input energy, so some organisms "make a living" off less demanding reactions. For example, green sulfur bacteria use hydrogen sulfide as an "electron donor" in place of water. This process and others like it are referred to as anoxygenic photosynthesis because no oxygen is produced. The associated pigments are called bacteriochlorophylls.

29/03/2011 · Published: March 29, 2011

As history makes clear, there are no certain bets in harnessing photosynthesis

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Photosynthesis forms the basis for primary production and fuels the formation of biomass with valuable chemical composition in plants. Although photosynthesis requires sunlight, the very nature of sunlight also has negative effects on photosynthesis. Visible light and ultraviolet light, the inherent parts of sunlight, may cause damage to the photosynthetic machinery and other cellular components. Plants have therefore evolved various protective and response mechanisms, which monitor the intensity, wavelength, duration and direction of light and mitigate the negative effects of light stress. Currently, the underlying molecular mechanisms and functional overlaps among light receptor and chloroplast signalling, and the consequent light‐dependent adjustments in plant performance are emerging. The ability to delicately sense, signal and respond to the ambient light environment forms a key contributor to plant growth and productivity.

The article was first published on 20 Dec 2011 Chem ..

But plants aren't the only organisms that use sunlight on Earth. Kiang studies various photosynthetic bacteria that have an entirely different set of pigments for absorbing light. She compares the spectra from these pigments to try to understand what mechanisms drive the evolution of the light harvesting ability.

Original Articles Effect of light intensity on the growth and photosynthesis of rice under different sulfur concentrations

Photosynthesis is a beautiful and deeply ..

The Biological Pigment Database contains spectral information for chlorophylls and bacteriochlorophylls, as well as for other accessory pigments that absorb light energy and transfer it to the main chlorophyll pigments responsible for photosynthesis. In addition, it includes biological sunscreen compounds that photosynthetic organisms produce to protect against excessive or harmful radiation, and carotenoids that serve the roles of both anti-oxidants and light harvesting pigments.

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Plants and algae use the energy absorbed by chlorophyll a to split water molecules. This splitting allows electrons from the water to be "donated" towards the reduction of carbon dioxide into carbohydrates (i.e. sugars). The byproduct of these reactions is oxygen, which is why the process is called oxygenic photosynthesis.

01/04/2013 · Photosynthesis is the basis of plant growth, and improving photosynthesis can contribute toward greater food security in …

added that the Joint Centre for Artificial Photosynthesis ..

What this tells us is that photosynthesis is not a one-size-fits-all solution, and the pigments used on a different planet will likely be adapted to local conditions. To help imagine what these alien pigments might be, Kiang has started the Biological Pigments Database. This contributes a biological component to the NASA Astrobiology Institute Virtual Planetary Laboratory’s Spectral Database, which brings together stellar radiation spectra, molecular line lists for atmospheric radiative transfer, and now biological pigments.

20/10/2015 · Conversion of light energy to chemical energy. Reactions of photosynthesis, where they take place, and their ecological importance.

20/10/2015 · Reactions of photosynthesis, ..

Plants and other photosynthetic organisms use special molecules for absorbing light. These pigments have a distinctive color, or spectrum, that is known to leave an imprint on the light reflected off our planet's surface. A new database catalogues the diverse palette of light-absorbing biological molecules on Earth in order to better predict what the photosynthetic signature might look like on other planets.

26/12/2011 · C3 photosynthesis - Get the latest health articles & updates including health care, diet, fitness, aging, medicine, nutrition, …

This article is a modified derivative of the following articles:

Jiang C‐D, Wang X, Gao H‐Y, Shi L and Chow WS (2011) Systemic regulation of leaf anatomical structure, photosynthetic performance, and high‐light tolerance in sorghum. Plant Physiology 155: 1416–1424.