(a.) Of or pertaining to a tetragon; having four angles or sides; thus, the square, the parallelogram, the rhombus, and the trapezium are tetragonal fingers.
(a.) Having four prominent longitudinal angles.
(a.) Designating, or belonging to, a certain system of crystallization; dimetric. See Tetragonal system, under Crystallization.
Example Sentences:
(1) The crystals are tetragonal, with unit cell dimensions a = 48.9 A and c = 82.0 A, space group P 41 21 2 or P 43212.
(2) The morphological unit of the regular array appeared to consist of four spherical subunits, each about 2 nm in diameter, which were arranged in a tetragonal pattern about 4.5 by 7.0 nm in dimension.
(3) Two different tetragonal crystal forms have been characterized, both diffracting to about 6 A using synchrotron radiation.
(4) The outer structured layer was a linear array of particles overlying an inner tetragonal array of larger subunits.
(5) An activity assay of redissolved tetragonal form crystals indicates that the uncleaved, functional serpin has been crystallized.
(6) The A ring of the steroid in the tetragonal crystal was found to be disordered, and exists in both a normal and inverted conformation.
(7) One was in a hexagonal array, and the other was in a tetragonal array.
(8) The crystals are tetragonal rods with unit cell dimensions a = 128.6 A, c = 92.5 A.
(9) A hydrated cobalt ion is found to coordinate to two N7 atoms of adjacent guanines, forcing these two guanines to destack with a large dihedral angle (32 degrees), in the dimer of the tetragonal form.
(10) These tubules are clearly distinguishable by their shape and fine structure from the periodic structure of a P. rhodos cell wall layer, which exhibits a tetragonal pattern, and also from polyheads and polysheaths of defective bacteriophages.
(11) The structure crystallizes in the tetragonal space group P41 with a = 8.225 (5) and c = 28.42 (1) A.
(12) This truncated S-protein was exported via the periplasm to the cell surface, but could not self-assemble into a tetragonal array or be anchored to the cell surface.
(13) Bacillus sphaericus strain P-1 has previously been shown to have a tetragonally arrayed (T layer) protein which forms the outer layer of the cell wall.
(14) Its three-dimensional structure from two different crystal forms (tetragonal and trigonal) has been determined by X-ray diffraction analysis at 1 A resolution.
(15) Both crystal forms are tetragonal, the space group for form I is P4(1)22 (or P4(3)22), and that for form II is P4(2)22.
(16) Density variations suggest an arrangement of subunits, either tetragonal or trigonal, viewed from a variety of angles about the DNA axis.
(17) The binuclear copper site is characterized as two tetragonal Cu(II) atoms bridged by both an endogenous protein ligand and the exogenous ligand (i.e., peroxide), with the lack of an electron paramagnetic resonance signal being the result of antiferromagnetic exchange via the endogenous bridge.
(18) The crystals are tetragonal, show the symmetry of space group P4(1) or its enantiomer, have lattice constants of a = 58.46 (1) and c = 77.02 (3) A, and scatter to at least 2 A resolution.
(19) These elevations were distributed according to a tetragonal pattern with a periodicity of 850 A.
(20) Crystals are tetragonal, with space group P42(1)2, a = b = 171 A, c = 150 A in the absence of ATP; and P422, a = b = 101 A, c = 114.4 A in the presence of ATP.
Zirconoid
Definition:
(n.) A double eight-sided pyramid, a form common with tetragonal crystals; -- so called because this form often occurs in crystals of zircon.