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The formation of an organ.
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 It might be outdated or ideologically biased.



the formation and development of organs in animals. Ontogenetic organogenesis is studied through embryology and biology of development, while phylogenetic organogenesis is studied through comparative anatomy. These disciplines describe and analyze the processes of organogenesis and explain the phylogenetic and ontogenetic origins of the processes. Comparative anatomy examines the rise of new organs and the transformation, division, progressive development and reduction, and rudimentation of organs. Study of the development of the forms of organs in connection with organ function led to the discovery of the basic principles of phylogenetic organogenesis—differentiation (seeDIFFERENTIATION), integration (seeINTEGRATION), and change of function.

To a large extent, ontogenetic organogenesis repeats phylogenetic organogenesis (seeBIOGENETIC LAW). Successive differentiation and integration of organs and uneven growth and active migration of cellular material occur in the course of ontogenetic organogenesis. The forces that underlie ontogenetic organogenesis can be precisely studied, especially by experiment. (For initial and subsequent stages of organogenesis seeDETERMINATION, CLEAVAGE, EMBRYONIC DEVELOPMENT, GERM LAYERS, INDUCTORS, INDUCTION, ORGANIZER.)

With respect to plants, “organogenesis” usually refers to the ontogenetic formation and development of basic organs—roots, stem, leaves, and flowers—from undifferentiated tissue, or meristem (seeMERISTEM).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Organogenesis' key existing shareholders will remain committed long-term partners by rolling over their equity into the combined company.
When very small doses were given during organogenesis to rats and rabbits there was significant maternal and fetal toxicity.
Some forest species present vascular tissue that favors organogenesis (Vila et al., 2003), due to the transport of endogenous hormones through these conductive tissues (Miriam et al., 2008).
"It was surprising to see that, even when women stop smoking when they find out they are pregnant, and therefore are not smoking during the period of fetal organogenesis, there is still an increased risk of some congenital birth defects to the fetus," Ms.
These findings provide us with rationale and logistical feasibility to steer organogenesis to specific region.
This suggests that new meristematic cells were initiated again in repetitive way (repetitive organogenesis) after subculturing, resulting in more proliferation and regenerated shoots.
El tiempo transcurrido desde la fecundacion hasta la eclosion fue de 36:13 h; durante este tiempo el embrion atraveso por los siguientes periodos: cigoto, clivaje (blastula), gastrula, segmentacion y organogenesis, eclosion y estado larval.
In the current study, ALT concentration in maternal plasma was found significantly lower during pregnancy when compared with non-pregnancy, whereas AST concentration in maternal plasma was found significantly higher from the period of extensive organogenesis to fetal growth stage of successful pregnancy.
This study was conducted to investigate the feasibility of using the leaf and petiole explants from the field plants for direct organogenesis of plant tissues.
"With wound care decision-makers increasingly moving toward evidenced-based products and buying groups selecting companies with broader product portfolios, Organogenesis is experiencing the largest growth in the company's history," said Gary S.
The two main in vitro techniques used for conifers are somatic embryogenesis and organogenesis. Especially in the genus Pinus, shoots can be induced in vitro by culturing excised cotyledons in medium containing cytokinins as the sole inducing agent, usually 6-benzylaminopurine (CORTIZO et al., 2009).