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Any part of the embryo which exerts a morphogenetic stimulus on an adjacent part or parts, as in the induction of the medullary plate by the dorsal lip of the blastopore.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(embryology), a region in the embryo of chordate animals that exerts an inductive influence on adjacent areas.

The term “organizer,” or “primary organizer,” was introduced by the German embryologist and 1935 Nobel laureate H. Spemann to designate the material of the dorsal lip of the blastopore—the prospective chordamesoderm—in the amphibian gastrula (seeGASTRULA). When transplanted to a remote site, for example, the ventral side of the embryo or the blastocoel, the material of the dorsal lip not only differentiates into organs that would normally arise had the transplant not taken place but also induces the development of neural and other structures in areas adjacent to the transplant site; this is an example of primary embryonal induction (seeINDUCTION). As a result of the action of the organizer, a new, more complex embryo forms in which the organs are situated roughly according to their future distribution.

Two organizers are distinguished. The cephalic organizer consists of the anterior section of the notochord and the material of the prechordal plate and induces formation of the anterior sections of the brain. The trunk organizer, consisting of the remaining material of the notochord and the somites, induces formation of the posterior sections of the brain and the trunk and tail structures. Organizers analogous to amphibian organizers have been found in all classes of chordates; these include Hensen’s node in birds and the posterior section of the embryonal disc in teleosts.

The term “organizer” is also applied to other embryonic organ rudiments that exert an inductive effect on adjacent areas; these are the secondary and tertiary organizers, as distinct from the chordamesoderm, which is called the primary organizer. Thus, the rudiment of the eye that originates as a result of primary embryonal induction is a secondary organizer; it induces formation of the iens in the ectoderm. The lens, in turn, is a tertiary organizer that induces formation of the cornea.

The term “organizer” stresses the concept that it is the rudiments of organs of living embryos that act as inductors and not substances excreted from the tissues of embryos or adults.


Saxen, L., and S. Toivonen. Pervichnaia embrional’naia induktsiia. Moscow, 1963. Pages 21–26. (Translated from English.)
Tokin, B. P. Obshchaia embriologiia. Moscow, 1970. Pages 262–80.
Bodemer, C. Sovremennaia embriologiia. Moscow, 1971. Pages 155–57. (Translated from English.)


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(1) Software that provides a calendar, to-do list and other daily management tools.

(2) A dedicated electronic device that is used to schedule appointments and tasks. Prior to the advent of smartphones, personal information managers (PIMs), which had a fixed number of functions, were very popular. After smartphones, dedicated portable devices such as the PIM, music player and GPS navigation units began to lose favor, because the smartphone could perform all those functions and countless others. See PIM and PDA.

A Computer Is an Organizer
The French word for computer is "ordinateur," which means organizer and is perhaps a better word for a device that is used so much for organization.

Organizer vs. Smartphone
Devices such as this Texas Instruments organizer from the early 1990s (left) were very popular until smartphones came along. The Galaxy Note II (right) is thinner, lighter and can run any of hundreds of thousands of apps and games.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
The magazine hired a creative director from New York who has given Organize a sleek look, part Dwell and part Martha Stewart Living.
Founded in 1970, ACORN organizes low- and moderate-income citizens into democratically run organizations that engage in direct-action tactics to win issues such as tenant rights, living wages, lifeline utility rates, affordable housing, access to bank loans, elimination of predatory lending, and numerous other issues.
The internationally respected Human Rights Watch published a 300-page study of 2-1/2 years documenting that American workers have lost the right to organize and that the United States is in violation of international law for failing to protect the right of American workers to freely form unions.
Active and representative rank-and-file organizing committees-defined as having at least 10 percent of the unit represented on the committee, and including at least one woman on the committee if the unit is 10 percent or more women, and at least one person of color on the committee if the unit is 10 percent or more workers of color; and committee members meeting with workers one-on-one in the workplace and engaging in two or more of the following actions during the campaign: spoke at house meetings, spoke out at captive audience meetings, spoke at community forums, conducted assessments, assisted with preparing board charges, or helped organize job actions.
For example, twenty unions, some with no healthcare experience, objected when SEIU's Stern wanted to establish exclusive jurisdiction for a $20 million campaign to organize upstate New York nursing homes and hospitals, where SEIU is already dominant.
"Now I don't know how we got along without email." He checks his voice-mail while driving to work, using it to help him to organize his day: what needs to be done, when and by whom.
Another aspect of the bishops' plan is their ecumenical effort to organize Protestant evangelists and churches as "front" groups, so as to avoid anti-Catholic criticism or recognition that there is a Catholic campaign to control politics.
Doctors are likely to turn to three sources for capital to organize and operate: (1) hospitals, (2) for-profit physician management companies, or (3) venture capitalists.
Except in the public sector, where managers less frequently mount vicious union avoidance campaigns, the legal right to organize has long been rendered moot.
Stakeholders of all kinds are encouraged to organize and/or attend these meetings.
When Mele organized a meeting last month to attempt to organize a tax revolt, the response was less than enthusiastic.
The meeting discussed some articles stipulated by the regulation for organizing and managing exhibitions to organize new and specialized exhibitions and invite some investors to organize these exhibitions under the name of the companies and the institutions but not via individuals.

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