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Walker B motif is a motif in most P-loop proteins situated well downstream of the A-motif. The consensus sequence of this motif was reported to be [RK]-x(3)-G-x(3)-LhhhD, where R, K, G, L and D denote arginine , lysine , glycine , leucine and aspartic acid residues respectively, x represents any of the 20 standard amino acids and h denotes a ...
The function of the histidine is to influence the reaction catalytically by contacting the residues across the dimer interface, including the Walker A motif and the Walker B motif. It is the histidine residue that forms the tight coupling between the binding of the ATP molecule and the dimer.
Motif II is also known as the Walker B motif and contains the amino acid sequence D-E-A-D (asp-glu-ala-asp), which gave this family of proteins the name “DEAD box”. [5] Motif 1, motif II, the Q motif, and motif VI are all needed for ATP binding and hydrolysis, while motifs, 1a, 1b, III, IV, and V may be involved in intramolecular ...
The Walker circulation, also known as the Walker cell, is a conceptual model of the air flow in the tropics in the lower atmosphere (troposphere). According to this model, parcels of air follow a closed circulation in the zonal and vertical directions. This circulation, which is roughly consistent with observations, is caused by differences in ...
The Walker Delta is also known as the Ballard rosette, after A. H. Ballard's similar earlier work. [5] [6] Ballard's notation is (t,p,m) where m is a multiple of the fractional offset between planes. Another popular constellation type is the near-polar Walker Star, which is used by Iridium. Here, the satellites are in near-polar circular orbits ...
Five eight-step random walks from a central point. Some paths appear shorter than eight steps where the route has doubled back on itself. (animated version)In mathematics, a random walk, sometimes known as a drunkard's walk, is a stochastic process that describes a path that consists of a succession of random steps on some mathematical space.
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A walker (North American English) or walking frame (British English) is a device that gives support to maintain balance or stability while walking, most commonly due to age-related mobility disability, including frailty. Another common equivalent term for a walker is a Zimmer (frame), a genericised trademark from Zimmer Biomet, a major ...