movement

(noun)

Physical motion between points in space.

Related Terms

Examples of movement in the following topics:

  • Chemotaxis

    • Chemotaxis is the phenomenon whereby bacterial cells direct their movements according to certain chemicals in their environment.
    • Positive chemotaxis occurs if the movement is toward a higher concentration of the chemical in question.
    • Conversely, negative chemotaxis occurs if the movement is in the opposite direction.
    • This is a result of simply choosing between two methods of random movement; namely tumbling and straight swimming.
    • The helical nature of the individual flagellar filament is critical for this movement to occur.

  • Organization of Ecosystems

    • Additionally, the movement of mineral nutrients in the food chain is cyclic rather than linear.
    • This image shows a simplified food web model of energy and mineral nutrient movement in an ecosystem.
    • Energy flow is unidirectional (noncyclic) and mineral nutrient movement is cyclic.

  • Scanned-Probe Microscopy

    • When the tip moves in proximity to the investigated object, forces of interaction between the tip and the surface influence the movement of the cantilever.
    • Selective sensors detect these movements.

  • Osmotic Pressure

    • Osmosis is the net movement of solvent molecules through a partially permeable membrane into a region of higher solute concentration.
    • If the medium is isotonic — a solution with exactly the same water concentration as the cell — there will be no net movement of water across the cell membrane .

  • Protozoa

    • ., movement).
    • In general, protozoa are referred to as animal-like protists because they are capable of movement, or motile.

  • Tissue Tropism in Animal Viruses

    • A tropism is a biological phenomenon, indicating growth or turning movement of a biological organism in response to an environmental stimulus.
    • In tropisms, this response is dependent on the direction of the stimulus (as opposed to nastic movements which are non-directional responses).

  • Rabies

    • Early-stage symptoms include malaise, headache and fever, violent movements, uncontrolled excitement, depression, confusion, agitation, anxiety, and hydrophobia.

  • Dark-Field Microscopy

    • It allows the visualization of live bacteria , and distinguishes some structure (rods, curved rods, spirals, or cocci) and movement.

  • Macrophages

    • They move by the action of amoeboid movement.

  • The Sulfur Cycle

    • The sulfur cycle describes the movement of sulfur through the atmosphere, mineral forms, and through living things.