volutin
Very Low (C2/Technical)Exclusively technical/scientific (microbiology, bacteriology, cell biology)
Definition
Meaning
A basophilic nucleoprotein complex found in the cytoplasm of certain bacteria, yeast, and other microorganisms, often serving as a storage reserve for inorganic phosphate.
Also known as metachromatic granules due to their property of changing colour when stained with basic dyes. It is a key diagnostic feature in some bacterial identifications.
Linguistics
Semantic Notes
The term is essentially synonymous with 'metachromatic granules' in microbiology. It refers to a specific intracellular structure, not a substance in free form.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. The term is uniformly technical.
Connotations
Neutral, purely descriptive scientific term.
Frequency
Extremely rare outside peer-reviewed journals, laboratory reports, and advanced microbiology textbooks.
Vocabulary
Collocations
Grammar
Valency Patterns
The bacterium {contains/displays/has} volutin granules.Volutin can be {identified/visualised/stained} with methylene blue.Vocabulary
Synonyms
Neutral
Weak
Usage
Context Usage
Business
Not used.
Academic
Used in research papers and theses on microbial physiology, taxonomy, or cytology.
Everyday
Not used.
Technical
Core term in microbiology lab manuals, diagnostic procedures (e.g., for *Corynebacterium diphtheriae*), and scientific discourse.
Examples
By Part of Speech
adjective
British English
- The volutin-positive reaction confirmed the bacterial strain.
- Cells were examined for volutin-like inclusions.
American English
- A volutin-positive test is diagnostic for some species.
- The cytology showed volutin-like granules.
Examples
By CEFR Level
- Under the microscope, scientists can see special structures called volutin granules inside some bacteria.
- The identification of *Corynebacterium* often relies on the detection of volutin granules using specific staining techniques like Albert's stain.
Learning
Memory Aids
Mnemonic
Think of a VOLUptuous bacTERIUM storing jewels (phosphate) in its VOLUTIN granules.
Conceptual Metaphor
CELL AS A WAREHOUSE (Volutin granules are storage units for phosphate.)
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'volute' (спираль, завиток) or 'volition' (воля). The Russian term is typically 'волютин' or 'метахроматические гранулы'.
Common Mistakes
- Using 'volutin' as a countable noun for a single granule (prefer 'volutin granule').
- Applying the term to human or animal cell biology.
- Misspelling as 'volutine' or 'valutin'.
Practice
Quiz
Volutin is most important in which field of study?
FAQ
Frequently Asked Questions
No, volutin is a storage material found specifically in certain bacteria, yeasts, and other microorganisms.
Its primary function is to store inorganic phosphate, which the microorganism can use for energy metabolism and nucleic acid synthesis when needed.
Because they exhibit metachromasia—a property where the granules stain a different colour (often red or purple) than the dye itself (usually blue) when using basic dyes like methylene blue.
No, it is a highly specialised term. Learners should only encounter it if studying microbiology or a related life science at an advanced level.