from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. of vectors, parallel but of opposite direction
- adj. describing the orientations of the two strands of DNA
- adj. describing two beta strands comprising a protein's secondary structure that are aligned and hydrogen bonded but the vector describing the amino- and carboxy-terminal ends of each strand are oriented 180° relative to one another.
- n. A line that forms equal angles with two other lines, but in opposite directions.
from the GNU version of the Collaborative International Dictionary of English
- adj. Running in a contrary direction.
from The Century Dictionary and Cyclopedia
- Running parallel but in a contrary direction.
- n. In geometry, one of two or more lines which make equal angles with two other lines, but in contrary order.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. (especially of vectors) parallel but oppositely directed
In most organisms, DNA is formed as a very long and very narrow double-helix formation of two DNA strands coiled around each other in a head-to-toe "antiparallel" orientation.
July 30, 2009 at 8:39 am the kittehs reminds me two electrons with all quantum numbers same except the spin parallel and antiparallel
For example, noting that in Watson-Crick base pairing the paired bases have the same face-orientation in forming the antiparallel double helix tells us much of what we need to know to build the correct structure.
In one aspect the method involves: (a) determining a first nucleotide sequence of a first nucleic acid coding for the biosynthesis of at least a portion of the original peptide or protein; (b) ascertaining a second nucleotide sequence of a second nucleic acid which base-pairs with the first nucleotide sequence of the first nucleic acid, the first and second nucleic acids pairing in antiparallel directions; and
Xu et al. expressed Cre-fragments fused to antiparallel leucine-zipper peptides in the pancreas using the same Pdx1-promoter for both fragments
E1 and E2 are thought to be class II fusion proteins because the putative fusion peptide is supposedly localized in an internal sequence linked by antiparallel β-sheets
The model predicts that these electrons are close enough together that the unpaired electron spin states can undergo transition, at some frequency, from antiparallel to parallel spin states (singlet-triplet intersystem crossing).
Therefore, the nuclear spin magnetic moment vector is either parallel or antiparallel to the nuclear spin angular momentum vector.
When the double strand is separated, two antiparallel strands exist.
Because these bonds are asymmetric, this arrangement of DNA strands is called antiparallel.