Definition

Noun: - A photosynthetic pigment found in certain bacteria, particularly purple bacteria and green sulfur bacteria. It is structurally and functionally similar to chlorophyll but differs in its absorption spectrum, allowing these bacteria to perform photosynthesis in environments with less light or different light wavelengths than plants.

Usage

• Scientific Context: Used primarily in microbiology, biochemistry, and photobiology to describe the light-absorbing molecule in anoxygenic photosynthetic bacteria.
  • The study focused on the energy transfer mechanisms within bacteriochlorophyll complexes.
  • These bacteria use bacteriochlorophyll to harvest infrared light, which penetrates deeper into water.

Advanced Usage

• "Bacteriochlorophyll a": The most common and well-studied type, found in purple bacteria.
  • The reaction center of Rhodobacter sphaeroides contains bacteriochlorophyll a.
• "Bacteriochlorophyll-protein complex": Refers to the functional unit within the bacterial photosynthetic apparatus.
  • The researchers isolated the bacteriochlorophyll-protein complex for X-ray crystallography.

Variants and Related Words

• Bacteriochlorophylls (plural noun): The collective term for different types (e.g., bacteriochlorophyll a, b, c, d, e, g).
  • Different species of green sulfur bacteria contain various bacteriochlorophylls.
• Chlorophyll (noun): The related green pigment found in plants, algae, and cyanobacteria responsible for oxygenic photosynthesis.
• Bacteriochlorin (noun): The core chemical structure (a tetrapyrrole) that forms the basis of bacteriochlorophyll molecules.

Synonyms

• Bacterial chlorophyll: A less common, descriptive synonym.
• Anoxygenic photosynthetic pigment: A functional description highlighting its role in photosynthesis that does not produce oxygen.

Notes on Meaning

This term has a single, specific scientific meaning. It does not have idiomatic expressions or phrasal verbs associated with it in common usage. Its use is confined to technical discussions about bacterial photosynthesis.

Noun

1. a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants