active principle

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1. a chemical component.
2. a substance on which certain of the properties of a drug depend.
3. an accepted or professed rule of action or conduct; in a given philosophical system it is a fundamental or general law or truth from which others are derived. In bioethics some important principles are beneficence, justice, nonmaleficence, and respect for autonomy; these are derived in part from professional roles and traditions.
active principle any constituent of a drug that helps to confer upon it a medicinal property.
Bobath p's a type of neurophysiological rehabilitation; see bobath method.
Bohr's principle of complementarity reflexes do not independently account for the complex nature of infant behavior.
negentropic principle a principle of general systems theory stating that open systems have mechanisms that slow down or arrest the process of movement toward less efficiency and growth. Negentropy (negative entropy) is the tendency toward order and organization.
pleasure principle (pleasure-pain principle) in psychoanalytic theory, an inborn tendency to avoid pain and seek pleasure through the immediate reduction of tension by either direct or fantasied gratification.
reality principle in psychoanalytic theory, the ego functions that modify the demands of the pleasure principle to meet the demands and requirements of the external world.

ac·tive prin·ci·ple

a constituent of a drug, usually an alkaloid or glycoside, that is largely responsible for conferring its characteristic therapeutic properties.

ac·tive prin·ci·ple

(ak'tiv prin'si-pĕl)
A constituent of a drug, usually an alkaloid or glycoside, on which the characteristic therapeutic action of the substance largely depends.

ac·tive prin·ci·ple

(ak'tiv prin'si-pĕl)
Constituent of a drug, usually an alkaloid or glycoside; largely responsible for conferring its characteristic therapeutic properties.


not passive.

active principle
the drugs or chemicals in a pharmaceutical preparation that exert an effect pharmacologically; as distinct from the inert fillers, wetting agents and other excipients also often included.
active site
that region of a protein, usually an enzyme, that binds to another molecule such as the substrate of the enzyme.
active transport
the movement of ions or molecules assisted by a carrier protein across the cell membranes and epithelial layers, usually against a concentration gradient, resulting directly from the expenditure of metabolic energy. For example, under normal circumstances more potassium ions are present within the cell and more sodium ions extracellularly. The process of maintaining these normal differences in electrolytic composition between the intracellular fluids is active transport. The process differs from simple diffusion or osmosis in that it requires the expenditure of metabolic energy.


1. a chemical component.
2. a substance on which certain of the properties of a drug depend.
3. a law of conduct.

active principle
any constituent of a drug that helps to confer upon it a medicinal property.
reasonable person principle
the basis for many decisions in cases alleging negligence. The court bases its judgment on what it considers a reasonable person, a reasonable veterinarian in our context, would have done in the circumstances. This is the evidence that most expert witnesses are asked to give, evidence about what should be expected of a member of their profession in terms of quality of performance. Called also principle of the reasonable person.
References in periodicals archive ?
A following examination of the sub-functions according to the active principles identifies possible solutions.
The main active principles of the leaves are polysaccharides, flavonoids.
Afterward, the general medical consensus was that the active principle of the thyroid gland contains iodine, and as a consequence, the thyroid preparations were standardized to contain 0.
McEwen proceeded to test six of the enzyme contaminants in commercially available hyaluronidase and discovered the active principle of beta-glucuronidase that is now used in EPD.
While most readers of the Timaeus, both Ancient and modern, have been and are puzzled by the exact relationship between Being, Demiurge, World Soul, and receptacle, the Stoics displayed an explanatory parsimony and posited two principles for the universe's structure: the active principle, or God, versus a passive one, or matter.
If the identity of the active principle or principles is unknown - as, for example, is the case with valerian or cranberries, standardization can be based on the concentration of marker substances that have been shown by appropriate trials to reflect the activity of the product.
It was Woodrow Wilson--with an addiction to phrasemaking that his secretary of state Robert Lansing privately criticized--who made "the self-determination of peoples" an active principle in world politics.
They equated the real with the material and defined the active principle in the universe as Force or God.
9,198,850 B2; Chanel Parfums Beaute has patented a cosmetic method for gradually releasing an amount of active principle on skin by exchange with ions of said active principle, all day long, under standard conditions, in order to provide at least one cosmetic benefit to the skin.
The attacks on mosques in Sweden and the continuing protests being marshalled by Pegida, Germany's ultra-right Patriotic Europeans against the Islamisation of the West, refocus on the persistent paradox of an ultra-liberal Europe which, despite its attested will of multiculturalism, has failed to turn it into an active principle.
Anti-Candida potential of Acorus calamus rhizome and its active principle, [beta]-asarone, was evaluated against the human fungal pathogen, Candida albicans.
Moreover thymoquinone, the active principle of NSO inhibited the production of 5-LO products (IC(50): 0.

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