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"
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References in periodicals archive ?
The bird species is monogamous; pair formation occurs in spring season when the male plays out a "romance show" including a head-tilt and a showing up of his expelled flanks.
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.); the ecology of ghost crabs; citizen scientists and marine research: volunteer participants, their contributions, and projection for the future; and the claw hypothesis: a new perspective on the role of biogenic sulfur in the regulation of global climate.
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. T-tests, df = 5,* denotes P < 0.001.
"Pair formation, acquiring a mate to form a reproductive unit, is a complex process.
Blue tits breed on their first year, and pair formation takes place in the winter.
Using these behaviors as a guide, I witnessed nesting behavior as early as 22 March in Ashley County (cliff swallows occupied old nests, lunged at intruders, and demonstrated pair formation).
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.
After pair formation in wintering and spring staging areas common to both species, male king eiders may occasionally follow female common eiders to their nesting colonies, resulting in the subsequent hybrid offspring.
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.