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 ?
Whereas, a plot of 1/kobs versus 1/[BrO -] is linear with a positive and non-zero intercept (Fig 3) which is indicative of ion pair formation between charged species.
The topics are pair formation in coral reef fishes: an ecological perspectives; the ecosystem roles of parrotfishes on tropical reefs; limits to understanding and managing outbreaks of crown-of-thorns starfish (Acanthaster spp.
Number of males (gray) and females (black) in the swarm near the beginning (10 min), middle (25 min) and end (50 min) from the start of mating 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.
Two water samples of 500 mL each were used: the first obtained 1 minute before the pair formation and the second 40 minutes after pairing.
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.
Observations of pairing behavior in Hyalella suggest that females have substantial control in pair formation.