They oxidize inorganic compounds as a source of energy.
OR
Chemoautotrophic bacteria uses energy produced by oxidizing or reducing chemical substances. The energy released from oxidation or reduction is used to synthesize organic compounds. Hence they don't need sunlight.
This chemosynthesis does not and this is how it differs from photosynthesis.
Photoautotrophs: Bacteria that use sunlight as their energy source and carbon dioxide (as part of photosynthesis) as their carbon source. These bacteria thus obtain all their nourishment through photosynthesis Photoheterotrophs: Bacteria that use sunlight as their energy source and organic compounds from the environment as their carbon source.
Autotrophs
Bacteria living in deep-sea communities obtain their energy from chemical sources, rather than from sunlight. They use hydrogen sulfide molecules that are clustered around deep-sea hydrothermal vents as their food sources.
A colored chemical compound that absorbs sunlight is a pigment. Chlorophyll is a green pigment found in the chloroplasts of plants, algae, and bacteria.
Oxidation Ponds treat wastewater through the interaction of sunlight, bacteria and algae. Algae grow using energy from the sun and carbon dioxide and inorganic compounds released by bacteria in water. During the process of photosynthesis, the algae release oxygen needed by aerobic bacteria. Again bacteria digest sewage by decomposing it and releases CO2 and inorganic compounds needed for growth of algae. Thus Sewage is digested by bacteria by decomposing it. The cycle and relation between bacteria and algae for food is known as algae bacteria symbiosis.
Bacteria that obtain their energy by removing electrons from inorganic molecules, rather than obtaining energy from the sun, are called chemoautotrophic. In general, organisms, that obtain their energy from sunlight are called photoautotrophs.
Different bacteria get their energy from different sources. There are three main types in bacterial metabolism: Phototrophs - get energy from sunlight Lithotrophs - get energy from inorganic compounds Organotrophs - get energy from organic compounds (compounds containing Carbon)
Plants manufacture sugars from sunlight and ground nutrients.
Chemosynthetic bacteria does not require sunlight to live and derives the nutrients from nonfood sources. Examples of chemosynthetic bacteria are lactobacillus and streptococcus.
Photoautotrophs: Bacteria that use sunlight as their energy source and carbon dioxide (as part of photosynthesis) as their carbon source. These bacteria thus obtain all their nourishment through photosynthesis Photoheterotrophs: Bacteria that use sunlight as their energy source and organic compounds from the environment as their carbon source.
The vast majority of microorganisms that live in soil is bacteria. Soil bacteria can be classified as either heterotrophs or autotrophs depending on how they receive nutrients. Heterotrophic bacteria use organic compounds to get the necessary amount of carbon; whereas, autotrophic bacteria is able to get it from either carbon dioxide, inorganic compounds, or sunlight.
Autotrophs
Bacteria living in deep-sea communities obtain their energy from chemical sources, rather than from sunlight. They use hydrogen sulfide molecules that are clustered around deep-sea hydrothermal vents as their food sources.
A colored chemical compound that absorbs sunlight is a pigment. Chlorophyll is a green pigment found in the chloroplasts of plants, algae, and bacteria.
Chlorophyll and sunlight make the plant able to manufacture food.
Oxidation Ponds treat wastewater through the interaction of sunlight, bacteria and algae. Algae grow using energy from the sun and carbon dioxide and inorganic compounds released by bacteria in water. During the process of photosynthesis, the algae release oxygen needed by aerobic bacteria. Again bacteria digest sewage by decomposing it and releases CO2 and inorganic compounds needed for growth of algae. Thus Sewage is digested by bacteria by decomposing it. The cycle and relation between bacteria and algae for food is known as algae bacteria symbiosis.
The green pigment which enables plants to use sunlight and manufacture food is chlorophyll.