- 行业: Archaeology
- Number of terms: 25214
- Number of blossaries: 0
- Company Profile:
In non-market societies, prestige valuables and ordinary commodities were often exchanged quite separately, i.e., valuables were exchanged against valuables in prestige transactions, while commodities were exchanged against commodities with much less ceremony, in mutally profitable barter transactions. These separate systems are termed spheres of exchange.
Industry:Archaeology
The hypothesis that mitochondria and chloroplasts originated as free-living prokaryotes that invaded primative eukaryotic cells and established a mutually beneficial (symbiotic) relationship.
Industry:Archaeology
A genetic recombination that occurs following the rare pairing of homologs during mitosis of a diploid cell.
Industry:Archaeology
A statistic that measures the strength of the association between two variables.
Industry:Archaeology
Changing to fit, or respond to, the requirements of the environment.
Industry:Archaeology
A cryptocrystalline fibrous quartz, usually light colored and translucent.
Industry:Archaeology
A process whereby cells that already have antibodies specific to an antigen on their surfaces are stimulated to proliferate and secrete that antibody.
Industry:Archaeology
An error in replication or other alteration of the nucleotide base sequence creating a change in the sequence of base pairs on a DNA molecule. If the change occurs in the DNA of a somatic cell, the mutation may cause a change in the organism's phenotype (leading, for example, to cancer) but will not affect the organism's offspring; only mutations in the germ cells can cause heritable changes in the offspring.
Industry:Archaeology
