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organizer

[′ȯr·gə‚niz·ər]
(embryology)
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.

Organizer

 

(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.

REFERENCES

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.)

G. M. IGNAT’EVA

organizer

(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.
References in periodicals archive ?
A new organization considering blending organizing and services should organize first and begin individual service provision after establishing a clear organizing model, identity, and reputation.
Initially CTW dismissed the constituency groups as organizations that were ineffective in helping organize workers in this dying labor movement.
Parson: For, for, for trying to organize my employees.
Vehicle free, but with the skills to organize and make sense of any information for anyone in the organization.
Present-day immigration policies and practices of the government are fundamental characteristics of the capitalist system," he said, "and the only possible way to confront those oppressing us is to organize as one, the alliance of students, workers, and the community.
The middle and upper class women of the WTUL provided financial support, publicity, access to legal advice, meeting rooms, and other resources often otherwise unavailable to women who tried to organize unions.
Now with new functionalities designed to integrate Home Concierge with popular calendar, email and PDA programs, it's even easier for homeowners to manage their household and organize their time and activities.
In the course of a failed bid to organize Harvard's mostly-female clerical and technical work force, United Auto Workers officials once planned to hand out pantyhose.
We include the scanner and software you need to organize books, comics, groceries, wine, DVDs, CDs, games, and other home assets.
In response, unemployed workers began to organize, giving birth to the piquetero (or picketers) movement and adopting the strategy of blocking highways to make their demands.
Although the battle is sometimes fought in the lingo of legal arcana, it is really about power: Should workers be able to organize in the workplace in ways that effectively counterbalance the power of their employers?
By guaranteeing working Americans the right to organize unions and bargain with their employers, it provided a way for people to get a fair share of the wealth they produced.

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