compaction

(redirected from Soil compaction)
Also found in: Dictionary, Thesaurus, Financial, Encyclopedia, Wikipedia.

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 ?
MEASURING COMPACTION The most common method of evaluating soil compaction is by means of the soil penetrometer, a device that measures the resistance of soil to the penetration by a conical steel probe (Figure 12-4).
DeNeve S and Hofman G: Influence of Soil Compaction on Carbon and Nitrogen Mineralization of Soil Organic Matter and Crop Residues.
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).
In general, soil compaction decreases large pores and total porosity, and increases fine pores (Reszkowska et al.
Themes in this category were wind erosion, water erosion and soil compaction.
Volvo Construction Equipment Road Machinery Director, Sales Region EMEA, Darren Fitch tells PMV about its soil compaction capabilities
The four factors weight, type of wheel, speed, and number of agricultural machinery traffic could impact on soil compaction.
Under each scenario they looked at the amount of soil compaction that occurred, the amounts of soil organic carbon and nitrogen found in the soils, and the amounts of surface plant residues, which help prevent erosion.
The project established complimentary experiments in China and Australia to assess the interaction of crop residue, wheel traffic-induced soil compaction and tillage.
Soil compaction abounds wherever massive farms or livestock operations (especially confined livestock operations) exist; and in many countries with naturally acidic soils, such as Australia and Ghana, overuse of fertilizers is causing soils to become even more acidic.
Forest grazing raises concerns related to possible reduction of seedling density and growth that may result from trampling and browsing damage, or soil compaction (Trimble and Mendel, 1995; Belsky and Blumenthal, 1997; Newman and Powell, 1997).