pair formation

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Noun1.pair formation - the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus
natural action, natural process, action, activity - a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity"
References in periodicals archive ?
Instances in which females did not avoid or approached displayers, may have signified an initial stage of pair formation.
They said that mating preferences, the propensity to mate with certain phenotypes, are an important part of pair formation.
Blue tits breed on their first year, and pair formation takes place in the winter.
The elementary electron-positron pair formation process is considered in terms of a revised quantum electrodynamic theory, with special attention to the conservation of energy, spin, and electric charge.
Step 6: repeat the step 4 (and step 5 when necessary), to continue the pair formation process.
Finding food, Displays, Songs and Calls, Territory and Pair Formation, Nests and Eggs, and information regarding Migration, complete the section.
i] Corrected for ion pair formation Level of Ion pair mobility by Ion pair mobility by treatment of Davies' formula (29) Anderko & Lencka's the ionic dormula (30) concentration Irrigation waters 108600 [+ or -] 1400 108800 [+ or -] 1500 Soil extracts 112000 [+ or -] 3000 112000 [+ or -] 3000 Soil extracts (A) 98000 [+ or -] 2000 98000 [+ or -] 2000 (A) Data from Griffin and Jurinak (1973).
Pair formation and promiscuity of cytokeratins: formation in vitro of heterotypic complexes and intermediate-sized filaments by homologous and heterologous recombinations of purified polypeptides.
Non-breeding (mostly immature) Canada Geese commonly gather in groups during summer (MacInness 1966, Zicus 1981b), and this might play an important role in pair formation like it does for Barnacle Geese (Hanson 1965, Leafloor 1998).
1992) reported the time soon after sunrise is strongly associated with pair formation and courtship on staging areas by Sandhill Cranes.
Pair formation in Black Scoter begins in winter flocks and continues into late spring on the breeding grounds (Bengtson 1966, Cramp and Simmons 1977).