antiparallel


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an·ti·par·al·lel

(an'tē-par'ă-lel),
1. Denoting molecules that are parallel but have opposite directional polarity, for example, the two strands of a DNA double helix.
2. Denoting the spins of two electrons occupying the same orbital area but with different spin quantum numbers.

antiparallel

/an·ti·par·al·lel/ (-par´ah-lel) denoting molecules arranged side by side but in opposite directions.

antiparallel

(ăn′tē-păr′ə-lĕl′, ăn′tī-)
adj.
Of or relating to two adjacent molecules whose sequences of atoms or other elements run in opposite directions: antiparallel strands of DNA.

antiparallel

[-per′ələl]
Etymology: Gk, anti + parallelos, side-by-side
pertaining to molecules, such as strands of DNA, that are parallel but are oriented in opposite directions.

antiparallel

Of two structures that lie parallel to each other but that run in opposite directions. The best-known example of antiparalellism is that of the two strands in the DNA molecule.
References in periodicals archive ?
Adjacent acid dimers are connected into antiparallel ribbons by C-H .
Structural phases that look like "paraelectric" and "antiferroelectric" are considered very unlikely, though antiparallel packing of PMVC chains cannot be excluded on the basis of a comparison of photoemission and inverse photoemission with theory.
The [alpha]-phase, the thermodynamically most stable form, is characterized by a monoclinic lattice where the chains have a zigzag planar configuration and the hydrogen bonds are formed between antiparallel chains within the (002) planes whereas the adjacent nonbonded chains are parallel (5).
The framework of this molecule consists of 12 antiparallel [beta]-strands exhibiting pseudo-3-fold symmetry.
The stable monoclinic [alpha]-form has a fully extended planar zig-zag chain conformation, with H-bonds lying between antiparallel chains.
The interlayer exchange coupling that causes the magnetization of the two ferromagnetic layers to be parallel or antiparallel to each other, depending on the thickness of the spacer, is now well understood when the spacer is a diamagnetic or paramagnetic metal.
At even higher concentrations, dipoles may exist in an antiparallel configuration, thus forming canceling dipole moments.
This [Alpha] crystal consists of sheets of fully extended planar antiparallel chain molecules Joined by hydrogen bonds.
The fastest decay mode occurs when a positron having an antiparallel quantum spin forms a bound state with an electron of the same quantum spin state.
Aggressive behavior was defined as follows: interaction between two pigs involving physical contact (biting, knocking, or lateral fighting with the opponents standing in antiparallel position both performing bites or knocks) starting with the first physical contact and ending with submissive behavior (escape) shown by one of the opponents or when both pigs moved away from each other (Langbein and Puppe, 2004; Borberg and Hoy, 2009; Krauss and Hoy, 2011; Rhim, 2012).
DNA, double stranded and antiparallel as a way for each strand to act as a template for semi-conservative replication, was the informational storehouse.
After drying the polymer layer, substrates were rubbed in a unidirectional antiparallel way.