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A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z
- IAA
- Indole-3-acetic acid
- IgA
- A class of antibody molecules abundant in tears, colostrum, and other secretions. [More]
- IgE
- A class of antibodies responsible for certain immediate hypersensitivities (allergies). [More]
- IgG
- The class of antibody molecules that is most abundant in the blood. [More]
- Immune privilege
- Immune surveillance
- The possibility that one function of the immune system is to recognize and destroy cancerous cells when they first appear.
- Immunity
- A state of enhanced responsiveness to a particular molecular shape (epitope), such as would be present on molecules on an invading bacterium, induced by prior contact with that epitope. Probably occurs in all vertebrates.
- Immunoglobulin
- Protein that acts as an antibody.
- Immunological memory
- Immunological tolerance
- The inability to produce antibodies and/or a cell-mediated immune response to a particular antigen.
- Immunosuppression
- The use of drugs or other agent (e.g., x rays) to inhibit an immune response. [More]
- Immunotoxin
- Synthetic molecule consisting of part of an antibody covalently attached to a toxin. Can be used to selectively kill a particular category of cells such as cancer cells or cells causing autoimmune disorders.
- Imprinting (genomic or parental)
- The preferential expression of the allele inherited from one parent or the other. [More]
- In vitro
- Done in the "test tube".
- In vivo
- Refers to experiments performed in the living organism.
- Independent assortment
- of genes
- Indole-3-acetic acid
- Inflammation
- Response of a tissue to injury. Characterized by increased blood flow, increased temperature, redness, accumulation of leukocytes, and pain.
- Infliximab
- Influenza
- Discussion
- Ingestion
- Taking of food or water into the body. [More]
- Inhibitory postsynaptic potential (IPSP)
- The hyperpolarization created in a neuron by the arrival of an action potential at the terminals of a neuron synapsing with it. [More]
- Inner Cell Mass
- [of mouse blastocyst] [of human blastocyst]
- Inorganic
- Term describing all compounds that do not contain carbon as well as a few simple carbon-containing substances such as carbon dioxide and the carbonates.
- Insertion
- [DNA]
- Insulin
- Insulin-dependent diabetes mellitus (IDDM).
- Insulin-like growth factor
- [Igf-1] Imprinting of Igf-2 gene (as well as that of its receptor)
- Integral membrane protein
- [schematic (48K)] [single-pass] [thylakoid] [mitochondrion]
- Integrins
- Interferon (IFN)
- Interleukins
- Cytokines that regulate development and activities of leukocytes. [in blood cell formation] [interactions with helper T cells]
- Intermediate filaments
- Discussion
- Intermediate host
- Host normally used by a parasite during an immature or larval stage of the parasite's life cycle.
- Interneuron
- Any neuron that is activated by and, in turn, activates other neurons. In vertebrates most interneurons are confined to the central nervous system (CNS). Also called an association neuron.
- Interstitial fluid
- The fluid lying between, and thus bathing, the cells of animals. Interstitial fluid is derived from blood. Lymph is derived from it.
- Intestine
- [physiology]
- Intrinsic factor
- [and pernicious anemia]
- Introgression
- Introduction of the genes of one species into the gene pool of another species.
- Intron
- Portion of a gene that is transcribed into RNA but is removed during the formation of the mature RNA molecule. Found in rRNA and tRNA genes as well as in genes encoding proteins. Most eukaryotic genes have introns; most prokaryotic genes do not.[More]
- Invariant (Ii) chain
- [and class II histocompatibility molecules]
- Invertebrate
- An animal that has no backbone.
- Inverted repeats
- Ion
- Atom or group of atoms that has an electrical charge arising from the gain or loss of electrons.
- Ion channels
- in cell membranes
- Ionic bond
- Chemical bond formed between ions of opposite charge. [More]
- Iron
- [nutritional requirement]
- Islets of Langerhans
- Isoleucine
- [structure]
- Isomer
- Molecule with the same molecular formula as another but with a different structural formula (e.g., glucose and fructose).
- Isometric
- The contraction, without shortening, of a muscle. [More]
- Isotonic
- (1) Adjective to describe the contraction of a muscle that is allowed to shorten as it exerts a steady force. (2) Having the same concentration of water as the solution under comparison. (More)
- Isotope
- Atom that differs in weight from other atoms of the same element because of a different number of neutrons in its nucleus. [Discussion]