phototrophic bacteria

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phototrophic bacteria

Phototrophic bacteria thrive in a sunlit pond.

Definition

Noun 1. Phototrophic bacteria: A group of bacteria (specifically green and purple bacteria) that obtain energy for growth from sunlight through a process called photosynthesis. Unlike plants, their carbon source can be either carbon dioxide or organic carbon compounds.

Usage Notes
  • This is a scientific term used primarily in microbiology and biology.
  • It refers to a specific functional group of bacteria defined by their metabolic process (using light for energy) rather than a single taxonomic family.
  • The term is often used in contrast to "chemotrophic bacteria," which derive energy from chemical reactions.
Examples
  • Scientific Context:
    • The study focused on the unique pigments found in phototrophic bacteria.
    • In this anoxic zone of the lake, phototrophic bacteria form colorful microbial mats.
    • These phototrophic bacteria can use hydrogen sulfide as an electron donor during photosynthesis.
Advanced Usage
  • The term is frequently modified to specify the type:
    • Anoxygenic phototrophic bacteria: Do not produce oxygen as a byproduct of their photosynthesis.
    • Purple sulfur bacteria / Green sulfur bacteria: Specific subgroups named for their color and metabolic traits.
Variants and Related Words
  • Phototroph (n): Any organism that uses light as its primary energy source. "Phototrophic bacteria" are a type of phototroph.
  • Phototrophy (n): The condition or process of obtaining energy from light.
  • Photosynthetic bacteria: A broader, sometimes synonymous term, though it can include cyanobacteria, which produce oxygen.
Synonyms
  • Photosynthetic bacteria (in specific contexts, though this can be a broader category)
  • Phototrophs (a broader category including plants, algae, and these bacteria)
Related Scientific Phrases
  • Anoxygenic photosynthesis: The type of photosynthesis performed by most phototrophic bacteria, which does not result in oxygen gas.
  • Bacteriochlorophyll: The light-harvesting pigment unique to these bacteria, different from the chlorophyll found in plants.
phototrophic bacteria

Phototrophic bacteria thrive in a sunlit pond.

Noun
  1. green and purple bacteria; energy for growth is derived from sunlight; carbon is derived from carbon dioxide or organic carbon

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