What's the difference between bipyramidal and dipyramidal?
Bipyramidal
Definition:
(a.) Consisting of two pyramids placed base to base; having a pyramid at each of the extremities of a prism, as in quartz crystals.
Example Sentences:
(1) Ca1 is in near-ideal pentagonal bipyramidal configuration with Asp200 carboxylate and Pro175 peptide C = O in an apical, and Val177 peptide C = O and four water molecules in an equatorial position, whereas Ca2 displays incomplete octahedral coordination with the carboxylate of Asp260, the peptide C = O of Val16 and the two water molecules.
(2) Calsequestrin has been precipitated with calcium into five different crystal forms: cruciform twins, flat rectangles, thin needles, bipyramids, rectangular prisms, and a sixth precrystalline form, spheres.
(3) Furthermore, rCLC protein expressed in COS cells spontaneously formed the distinctive intracytoplasmic and intranuclear hexagonal bipyramidal crystals characteristic of the native eosinophil and basophil-derived protein.
(4) In the dorsal and dorsomedial cortices all three proteins coexist in a single subpopulation of gamma-aminobutyric acid (GABA)ergic neurons, the terminals of which form pericellular baskets around cell bodies of bipyramidal neurons.
(5) These interactions may also catalyze the reaction by lowering the energy of a trigonal bipyramidal transition state.
(6) The enzyme was crystallized to single octahedral bipyramids with sizes up to 500 x 200 x 150 microns 3.
(7) SEM examination revealed structures similar to human stones such as bipyramidal weddellite, pseudomorphs from whewellite to weddellite, apatite deposits in cystine stones and characteristic mono-ammonium-urate needles.
(8) A universal feature of these sites is the use of a pentagonal bipyramidal array of seven oxygens to coordinate bound Ca2+.
(9) The crystals have the form of tetragonal bipyramids, the longest dimension being about 0.4 mm.
(10) Hexagonal bipyramidal and tetragonal crystals were obtained for both forms depending on buffer species.
(11) X-ray crystallographic studies of the intradiol cleaving protocatechuate 3,4-dioxygenase from Pseudomonas aeruginosa have shown that the enzyme has a trigonal bipyramidal ferric active site with two histidines, two tyrosines, and a solvent molecule as ligands [Ohlendorf, D.H., Lipscomb, J.D., & Weber, P.C.
(12) The DpnM protein tends to precipitate at reduced ionic strength, and this property was exploited to yield well-formed bipyramidal crystals.
(13) Difluorotriphenylphosphorane [(C6H5)3PF2] displays a trigonal bipyramidal geometry about the P atom, with the two F atoms occupying axial positions.
(14) The "strong" calcium binding site has a pentagonal bipyramid coordination and is fully occupied in all three structures.
(15) Bacillus thuringiensis produces a 130-140 kDa insecticidal protein in the form of a bipyramidal crystal.
(16) In addition to tetragonal bipyramids, weddellite forms further crystal shapes that have been heretofore interpreted exclusively as whewellite crystals.
(17) Na(1) is coordinated by six O atoms in a highly distorted octahedral arrangement with an average Na-O distance of 2.44 (10) A. Na(2) is coordinated by five O atoms in a highly distorted trigonal bipyramidal arrangement with an average Na-O distance of 2.36 (3) A.
(18) The hexagonal bipyramidal crystal belongs to a hexagonal space group P6(2)22 or P6(4)22 with a = b = 105.8 A and c = 122.2 A.
(19) The simplest interpretation is that the mechanism of this endonuclease involves a direct in-line attack at phosphorus by H2O with a trigonal bipyramidal transition state.
(20) The weak NO3- inhibitor does not displace Wat263 from the metal coordination but occupies a fifth binding site changing the zinc coordination polyhedron into a slightly distorted trigonal bipyramid.
Dipyramidal
Definition:
Example Sentences:
(1) In this situation a morphological criterion of typical dipyramid shape is useless to identify COD.
(2) The crystals are hexagonal dipyramids, space group P6(1)22 (P6(5)22), with unit-cell parameters a = b = 61 A, c = 320 A.
(3) Calcium oxalate dihydrate crystals wee basically dipyramidal, a majority of them showing interpenetrant twinning.
(4) The third type of crystal was assigned to dipyramids.
(5) Dipyramids are extremely rare, and only two diffraction patterns were obtained; their crystal system could not be determined.