Glossary
Terms starting with I
221 definitions · page 4 of 4.
- introduction
- A passage or section, often in a slow tempo, that prepares the way for a more extended section.
- intron (intervening sequence)
- A DNA segment of largely unknown function within a gene that specifically interupts the coding (exon) sequences of that gene. Introns are transcribed as part of the normal gene primary transcript, but intron sequences are not found in the functional mRNA…
- Invar Shadow Mask
- Helps provide greater resistance to the effects of heat produced by electron beam bombardment. This protection helps reduce the problem of colour blur from "doming" and assures consistently bright, sharp images in TVs.
- inversion
- The playing of a melody upside down, with upward intervals played downwards and vice verse, most common in contrapuntal and serial music.
- inversion
- A chromosomal mutation involving the removal of a chromosome segment, its rotation through l80 degrees, and its reinsertion in the same location. The replacement of a section of a chromosome in the reverse orientation.
- inverted repeat (IR) sequence
- A sequence found in identical (but inverted) form, for example, at the opposite ends of a transposon. A nucleotide sequence found at two sites on the same double helix but in opposite orientation.
- INVESTMENT INCOME
- Income generated by the investment of assets. Insurers have two sources of income, underwriting (premiums less claims and expenses) and investment income. The latter can offset underwriting operations, which are frequently unprofitable.
- INVESTOR-OWNED UTILITIES
- A private company that provides a utility, such as water, natural gas or electricity, to a specific service area. The investor-owned utility is regulated by the California Public Utilities Commission. In California the investor owned utilities supplying…
- Invisible Web
- the portion of the Web not indexed by search engines.
- iojap
- A locus in maize that produces variegation.
- ION
- An atom or group of atoms that is electrically charged
- ion
- an atom that is electrically charged due to the loss or gain of one or more electrons
- ionization
- the process by which an atom gains or loses electrons
- ionized gas
- a gas that has been heated to a state where it contains ions and free-floating electrons; also known as a plasma
- ionizing radiation
- Radiation, such as X-rays and gamma rays (high energy photons), that causes atoms to release electrons and become ions.
- ionosphere
- an atmospheric layer with a high concentration of ions and free electrons
- IOU
- An investor owned utility. A company, owned by stockholders for profit, that provides utility services. A designation used to differentiate a utility owned and operated for the benefit of shareholders from municipally owned and operated utilities and rural…
- IP
- (Internet Protocol) is tha main protocol used on the Internet.
- IP Address
- Internet Protocol Address. A unique number identifying all devices connected to the Internet. This number is usually shown in groups of numbers from 0 to 255, separated by periods, for example 207.46.230.218.
- IP packet
- IP packet is the basic data chunk that can be sent over the Internet. All the data is partitioned into IP packets on the sending computer and reassembled on the receiving computer.
- IPP
- INDEPENDENT POWER PRODUCER. An private entity that operates a generation facility and sells power to electric utilities for resale to retail customers.
- IPX
- Internet Packet Exchange. A Novell's proprietary network protocol.
- IRC
- Internet Relay Chat. Multi-user chat service. IRC users can go into public or private channels to discuss a topic or transfer files. IRC servers are connected into networks. The most popular IRC client program is mIRC. Many hosts are vary of letting…
- Irish coffee
- A coffee drink made from strong black coffee, sugar and Irish whiskey, topped with fresh whipped cream and sometimes garnished with a coffee bean. It's served in a warmed Irish coffee glass - a tall glass with a handle.
- irregular galaxy
- a galaxy without a clearly defined spiral or elliptical shape
- irregular meter
- The mixture at a single rhythmic level of more than one metric grouping.
- Irritant
- A substance that consistently and predictably produces an adverse response (such as reddening, swelling, itching, burning, or blistering) in virtually all of the population. Irritants are not to be confused with allergens.
- ISDN
- (Integrated Services Digital Network). An international standard that governs the transmission of both voice and data. It uses a digital circuits and has speed of 64Kbps. It can be used for normal telephone service as well as data transmission.
- ISDN
- INTEGRATED SERVICES DIGITAL NETWORK. A 128 Kbps(kilobytes per second) digital telephone service available in many parts of the country though not universally available thatmay be able to substitute for fiber optic cable in every respect except possibly…
- ISO
- (International Organisation for Standardisation). An Geneva-based international organization that develops and publishes various international standards.
- ISO -- INDEPENDENT SYSTEM OPERATOR
- A neutral operator responsible for maintaining instaneous balance of the grid system. The ISO performs its function by controlling the dispatch of flexible plants to ensure that loads match resources available to the system.
- isoaccepting tRNA
- The various types of tRNA molecule carrying a specific amino acid.
- isochromosome
- A chromosome with two genetically and morphologically identical arms.
- isoschizomer
- restriction endonuclease that recognizes the same target DNA sequence and cleaves it in the same way.
- isotope
- forms of an element in which the atoms all have the same number of protons but different numbers of neutrons
- isotope
- One of several forms of an element having the same atomic number but differing atomic masses.
- isozyme
- A different electrophoretic form of the same multi-subunit enzyme. Unlike allozymes isozymes are due to differing subunit configurations rather than allelic differences.
- ISP
- Internet Service Provider. A company that provides its subscribers with Internet access. Customers have a username and a password and can dial-up or use a cable or DSL line to connect to ISP's network which is connected to the Internet. The biggest ISP is AOL.
- ITU
- (International Telecommunication Union). (Formerly CCITT). Another international standards body concerned with telecommunications.
- IV
- 1) Immigrant Visa or 2) International Visitor
- Ixquick
- metasearch engine located at www.ixquick.com