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Cell Communication definition: Any of several ways in which living cells of an organism communicate with one another, whether by direct contact between cells or by means of chemical signals carried by neurotransmitter substances, hormones, and cyclic AMP.
cell cell interaction definition: ways in which living cells of an organism communicate with one another, whether by direct contact between cells or by means of chemical signals carried by neurotransmitter substances, hormones, and cyclic AMP.
cell communication definition: Any process that mediates interactions between a cell and its surroundings. Encompasses interactions such as signaling or attachment between one cell and another cell, between a cell and an extracellular matrix, or between a cell and any other aspect of its environment. [GOC:mah]
Double Bind Interaction definition: Simultaneous communication of conflicting messages in which the response to either message evokes rejection or disapproval. (APA, Thesaurus of Psychological Index Terms, 8th ed.)
Epistasis, Genetic definition: A form of gene interaction whereby the expression of one gene interferes with or masks the expression of a different gene or genes. Genes whose expression interferes with or masks the effects of other genes are said to be epistatic to the effected genes. Genes whose expression is affected (blocked or masked) are hypostatic to the interfering genes.
Host-Parasite Interactions definition: The relationship between an invertebrate and another organism (the host), one of which lives at the expense of the other. Traditionally excluded from definition of parasites are pathogenic BACTERIA; FUNGI; VIRUSES; and PLANTS; though they may live parasitically.
Host-Parasite Relationship definition: The interactions between two organisms, one of which lives at the expense of the other. (NCI)
interaction definition: Reciprocal action or influence among people including parent-child, parent-teacher, and nurse-client.
Sperm-Ovum Interactions definition: Interactive processes between the oocyte (OVUM) and the sperm (SPERMATOZOA) including sperm adhesion, ACROSOME REACTION, sperm penetration of the ZONA PELLUCIDA, and events leading to FERTILIZATION.
nutrient interaction definition: physical chemical interaction between nutrients, or between nutrients and other components of the diet or other compounds, including desirable or undesirable results; nutrients are substances that can be metabolized by an organism to give energy and build tissue; for the concept of nutrients interacting with drugs use NUTRIENT DRUG INTERACTION.
Food-Drug Interactions definition: The pharmacological result, either desirable or undesirable, of drugs interacting with components of the diet. (From Stedman, 25th ed)
nutrient drug interaction definition: either desirable or undesirable pharmacological result of drugs interacting with nutrients; used for both drugs of abuse and pharmaceuticals interacting with nutrients.
Elementary Particle Interactions definition: The interactions of particles responsible for their scattering and transformations (decays and reactions). Because of interactions, an isolated particle may decay into other particles. Two particles passing near each other may transform, perhaps into the same particles but with changed momenta (elastic scattering) or into other particles (inelastic scattering). Interactions fall into three groups: strong, electromagnetic, and weak. (From McGraw-Hill Encyclopedia of Science & Technology, 7th ed)
Microbial Interactions definition: The inter- and intra-relationships between various microorganisms. This can include both positive (like SYMBIOSIS) and negative (like ANTIBIOSIS) interactions. Examples include virus - bacteria and bacteria - bacteria.
Drug Interactions definition: The action of a drug that may affect the activity, metabolism, or toxicity of another drug.
drug interaction definition: physical chemical interaction between drugs and other compounds, including other drugs, particularly in biological systems.
Drug Interaction definition: Alteration of the disposition and/or effect of a drug, owing to the presence of another factor such as a second drug, or food.
Herb-Drug Interactions definition: The effect of herbs, other PLANTS, or PLANT EXTRACTS on the activity, metabolism, or toxicity of drugs.
Enzyme Interaction definition: Enzyme Interaction involves temporary non-covalent binding, typically through intermolecular physical forces of attraction and spatial complementarity, between a molecular entity and biological molecules, usually proteins, that possess catalytic activity. Catalytic RNA and DNA molecules have also been identified.
Active Transporter Interaction definition: Active Transporter Interaction involves temporary non-covalent binding of a molecule through intermolecular physical forces of attraction with a protein that, after conformational change, moves a bound substrate across a cell membrane with (symport) or against (antiport) a concentration gradient resulting directly from the expenditure of energy.
Pathway definition: A set or series of interactions, often forming a network, which biologists have found useful to group together for organizational, historic, biophysical, or other reasons.