compaction


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Related to compaction: Soil compaction

compaction

 [kom-pak´shun]
a complication of labor in twin births in which there is simultaneous full engagement of the leading fetal poles of both twins, so that the true pelvic cavity is filled and further descent is prevented.

com·pac·tion

(kom-pak'shŭn),
The process following the third cleavage division of the zygote during which the blastomeres maximize their contact with each other by polarization and adhesion, forming a compact ball that is held together by tight junctions; compaction segregates the inner cells of the blastocyst that form the embryo from the outer cells that form the fetal part of the placenta.
[L. compactio, fr. com-pingo, pp. com-pactus, to press together]

compaction

/com·pac·tion/ (kom-pak´shun)
1. a complication of labor in twin births in which there is simultaneous full engagement of the leading fetal poles of both twins, so that the lesser pelvis is filled and further descent is prevented.
2. in embryology, the process during which blastomeres change their shape and align themselves tightly against each other to form the compact morula.

com·pac·tion

(kŏm-pakshŭn)
Act of compression or squeezing together.
[L. compactio, fr. com-pingo, pp. com-pactus, to press together]

compaction (kompak´shən),

n the act of compacting or the state of being compact.

compaction

packing together as in twin births when both fetuses engage the pelvis at the same time, in prolonged constipation in dogs, and in compaction of endochondral bone as a part of normal bone modeling.
References in periodicals archive ?
Still, the achievable degrees of compaction with the material as it comes directly from the ripening heaps are lower than originally requested.
For more information on the compaction sensor, download the full paper, "Online Differential Sand Compaction Sensor for Optimizing the Lost Foam Process," at www.
This required the creation of a separate sample for each compaction ratio for a particular flake thickness (Fig.
Therefore, these are seen as reasonable sites to study the impact of compaction on selected grassland soil properties.
Regarding organic matter, the susceptibility of the soil to compaction depends largely on the quantity of organic matter (Greacen and Sands 1980).
Soil compaction was obtained in the field using a penetrometer inserted into the soil after removing the stony surface (Lei and Walker 1997; Lei 1999; Lei 2000).
Apoptotic cells are characterized by a number of morphologic, molecular, and biochemical features, including shrinkage of cells, blebbing of cells and nuclear membranes, compaction and condensation of chromatin toward the nuclear periphery, and fragmentation of DNA into oligonucleosomes (26,27).
That said, the keenest challenge of all was to achieve all this in the context of an operational airport: but the work was completed on schedule and with minimum disruption due, in part, to Svedala Dynapac's computerised Compaction Control System Recorder Analyser.
A lawn that produces mushrooms will be less mushroom friendly following aeration, since this procedure alleviates the sol compaction and standing water that encourage mushroom growth.
A number of studies on polymer compaction (applying pressure to form contacts) and sintering (applying heat to promote bonding) have been performed, and a good review of this research is presented by Jog.
Research has shown that if compaction is avoided and trees are planted in appropriate minesoils, the long-term growth should result in SI 100 after 50 years.