pellicle

/'pelikl/

Thân thiện

The student observes the pellicle of a paramecium under the microscope.

Definition

1. Noun:
   • A very thin skin, film, or membrane, especially one that is protective or forms a covering. In biology, it specifically refers to the thin, protective outer layer or membrane found on the surface of some microorganisms, such as certain protozoa and algae.

Usage

• The word "pellicle" is a technical term used primarily in biology, microbiology, and photography. It describes a delicate, often transparent, surface layer.
• In biology, it refers to the rigid or flexible outer covering of certain single-celled organisms, providing shape and protection without being a true cell wall.
• In photography and optics, it can refer to a thin film or coating on a lens or a very thin membrane used in some camera systems.

Examples

• Noun:
  • The paramecium is covered by a flexible pellicle.
  • A thin pellicle of scum formed on the surface of the stagnant pond.
  • The old camera used a fixed pellicle mirror instead of a moving one.

Advanced Usage

• "To form a pellicle": This phrase is used in contexts like fermentation (e.g., winemaking, kombucha brewing) to describe the development of a thin, cellulose-based biofilm on the surface of the liquid.
  • During fermentation, a healthy pellicle should form on top of the beer.

Variants and Related Words

• Pellicular (adj): Of or relating to a pellicle.
  • The pellicular structure gives the organism its shape.

Synonyms

• Film: A thin layer or coating.
• Membrane: A thin, pliable layer of tissue or material.
• Sheath: A protective covering.
• Cuticle: The outer layer of skin or a protective layer.

Antonyms

• Crust: A hard outer layer.
• Shell: A hard, rigid outer covering.

Notes

• The term is highly specific. In everyday language, words like "film," "skin," or "coating" are more common. "Pellicle" is reserved for precise scientific or technical descriptions.

Học thuật

Noun

1. thin protective membrane in some protozoa