A team of researchers from Germany, Denmark and the United Kingdom has identified circadian rhythms in non-photosynthetic, Gram-positive bacterium Bacillus subtilis. Why identify microscopic photosynthetic bacteria called Cyanobacteria? Plants, algae, and a group of bacteria called cyanobacteria are the only organisms capable of performing photosynthesis . Cyanobacteria photosynthesize like all plants do and thus produce the oxygen we breath. Definition: Cyanobacteria represents the major group of photosynthetic bacteria, which can carry out the oxygenic photosynthesis.It releases oxygen and uses water as an electron-donating substrate, i.e. Chloroplasts In green leaves, the cells just below the epidermal layer contain the green organelles called chloroplasts. The energy extracted today by the burning of coal and petroleum products represents sunlight energy captured and stored by photosynthesis 350 to 200 million years ago during the Carboniferous Period. ... bricks of the so-called “living concrete” are made by mixing the ingredients in a mold. The chloroplasts of plants use a process called photosynthesis to capture light energy from the sun and convert it to chemical energy stored in sugars and other organic molecules. These were formerly thought to be algae, until scientists found that they had no nuclei, like other bacteria. Photosynthetic bacteria in the concrete make it bright green until it dries and turns brown. All the photosynthetic bacteria contain chromatophores which have β-carotene, xanthophyll (carotenoids), and phycobilisomes (phycocya­nin and phycoerythrin). Close relatives of cyanobacteria were probably the ancestors of the photosynthetic organelles (plastids) in modern plants. Plants and other autotrophs are the producers of the biosphere. Photosynthetic bacteria are able to produce energy from the sun's rays in a process similar to that used by plants. splits water molecule to release oxygen. The sunlight is transferred to the light-harvesting system found in the chloroplast. Most of the carotenes are present in photosystem I while phycobilisomes are present in photosystem II. Instead of using chlorophyll to capture the sun's light, these bacteria use a compound called bacteriochlorophyll. Other than this, they are also capable of fixing nitrogen. Photosynthetic microorganisms are united by the need to maximize solar irradiation onto their light trapping centers. Purple and green bacteria and cyanobacteria are photosynthetic. The photosynthetic reaction center is made up of several protein complexes, and pigments that are combined to exhibit the primary energy conservation reactions during photosynthesis. Cyanobacteria, the small, harmless bacteria, are invisible to the naked eye. Photosynthetic bacteria have functionally equivalent pigments called bacteriochlorophylls, and also ancillary pigments involved in light trapping. o Within the chloroplasts, there are structures containing special light-sensitive pigments called chlorophyll. Bacteriochlorophylls: Photosynthetic bacteria appear in different colour suspension. Chapter 10: Photosynthesis Lecture Outline Overview: The Process That Feeds the Biosphere Life on Earth is solar powered. Structures Involved in Photosynthesis Photosynthesis occurs in specialized organelles within plants, called chloroplasts. In nature they can be found almost everywhere from the open ocean, to deserts and thermal springs. 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