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In biology, cell theory is a scientific theory first ... Such criticisms stimulated continued studies on protoplasm as the principal agent determining cell ...
The issue of tipping is sometimes discussed in connection with the principal–agent theory. "Examples of principals and agents include bosses and employees ... [and] diners and waiters." "The "principal–agent problem", as it is known in economics, crops up any time agents aren't inclined to do what principals want them to do.
This is called the principal–agent problem and is an important theory in economics and political science. Principal–agent theory has suggested that some governance mechanisms can help align the interest of the principal with those of the agent. Steering and monitoring are key mechanisms to bring this about. [4]
[2] [3] Relevant theories helping to understand human behavior include utility theory, principal-agent theory, need hierarchy theory, two factor theory, cognitive evaluation theory, expectancy theory, goal-setting theory, and equity theory. [3]
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When set in motion, phlogiston is the chief active principle in nature of all inanimate bodies. It is the basis of colours. It is the principal agent in fermentation. [9] Pott's formulations proposed little new theory; he merely supplied further details and rendered existing theory more approachable to the common man.
For example, viruses are dependent on entering and hijacking host cells to use their resources for growth and reproduction, incapable of growing alone. [ 8 ] The third postulate specifies "should", rather than "must", because Koch's experiments with tuberculosis and cholera showed that not all organisms exposed to an infectious agent will ...
Krogh's principle states that "for such a large number of problems there will be some animal of choice, or a few such animals, on which it can be most conveniently studied." This concept is central to those disciplines of biology that rely on the comparative method , such as neuroethology , comparative physiology , and more recently functional ...