Encyclopedia of Biology

Hewas a member of several scientific societies and was elected a fellow of the Royal Society in 1918, serv- ing as secretary for ...

homeosis The replacement of one body part by another caused by mutations or environmental factors initiating developmental anoma ...

homosporous Plants that produce a single type of spore that develops into a bisexual gametophyte and has both male and female se ...

Hopkins, Frederick Gowland (1861–1947) English Biochemist Frederick Gowland Hopkins was born on June 20, 1861, in Eastbourne, En ...

the private sector; and address the ethical, legal, and social issues (ELSI) that may arise from the project. See alsoGENE. humo ...

molecule is attracted to the partially negative atom of a polar covalent bond in another. hydrogen ion(hydron) A single proton w ...

hyperparasitoid Aparasitoid that lives on another parasitoid, e.g., members of the families Perilampidae, Signiphoridae, and Ela ...

hypotonic solution 171 cancerous) enlargement of the prostate gland, common in older men. hyperpolarization An electrical state ...

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ileum The third and last section of the small intestine. imaginal disk A region or cluster of cells in the lar- vae of an insect ...

imprinting A type of behavior learned during a cer- tain critical time in development that promotes the learning of behavior and ...

industrial melanism A natural selection process that developed in the 19th century, when certain species such as moths developed ...

floral arrangements can be in the form of a panicle [slightly elongated with central axis with branches that branch themselves]. ...

insertion reaction Achemical reaction or transfor- mation of the general type X–Z + Y Ô X–Y–Z in which the connecting atom or gr ...

insulin A protein hormone produced in the pan- creas by beta cells, located in the islets of Langerhans, that stimulates cellula ...

interneuron One of the three types of neuron net- works (along with sensory and motor neurons) that allow information flow by wa ...

the fractional values within this range denoting PARTIAL AGONISTs. Ariëns’s original definition equates the molecular nature of ...

inverse agonist (negative antagonist) A DRUGthat acts at the same RECEPTORas that of an AGONIST, yet produces an opposite effect ...

irregular Refers to flowers that are bilaterally sym- metrical, i.e., that are divisible into equal halves only in one plane. ir ...

joint The contact area between two bones. There are many different types of joint, including hinge, ball and socket, universal, ...