Definition: Organisms like algae and small crustaceans that attach themselves to surfaces in freshwater environments.

Example: The periphyton on the rocks provided food for the fish in the stream.

Definition: The area located between the plasma membrane and the outer membrane of certain bacteria, which contains enzymes and a layer of peptidoglycan.

Example: In gram-negative bacteria, the periplasm plays a crucial role in nutrient processing and transport.

Definition: Relating to the space between the inner and outer membranes of certain bacteria, where various biochemical processes occur.

Example: The periplasmic space contains enzymes that help break down nutrients for the bacterium.

Definition: A layer that surrounds the cell membrane of certain microorganisms or cells, providing structure and protection.

Example: The periplast helps maintain the shape of the cell and protects it from external factors.

Definition: A hard outer covering that protects and surrounds the colonies of certain small aquatic animals called hydrozoans.

Example: The perisarc provides essential protection for the delicate polyps living within it.

Definition: A tube-shaped device that uses mirrors and lenses to allow someone to see things that are not in their direct line of sight.

Example: The submarine used a periscope to see above the water without being detected.

Definition: Related to devices that allow you to see things from a different angle or perspective, often used in submarines or other situations where direct sight is blocked.

Example: The periscopic lens allowed the submarine crew to see above the water's surface without being detected.

Definition: The characteristic of something that can spoil or decay over time, especially food items.

Example: The perishability of fresh fruits means they must be consumed quickly.

Definition: The process of wavelike muscle contractions that move food and other substances through the digestive system or other tubular structures.

Example: Peristalsis is essential for moving food from the esophagus to the stomach.

Definition: Relating to the wave-like muscle contractions that move food through the digestive system.

Example: The peristaltic movements of the intestines help in digesting food.