Structure schematic representations

Fig. 16.1 Sodium channel structure. Schematic representation of the sodium channel subunits, a, ySl and / 2. (A) The a-subunit consists of four homologous intracelIularly linked domains (I—IV) each consisting of six connected segments (1-6). The segment 4 of each of the domains acts as the voltage sensor, physically moving out in response to depolarization resulting in activation of the sodium channel. The channel is inactivated rapidly by the linker region between III and IV docking on to the acceptor site formed by the cytoplasmic ends of S5 and S6 of domain IV. The / -subunits have a common structure, with the / 1 non-covalently bound, and f 2 linked by disulfide bonds to the a-channel...

Table 5.48. Structure, Schematic Representation of the Biosynthetic Incorporation of [l-13C]-Acetate ( ), [2-13C]-Acetate ( ), [Methyl-,3C]methionine (A), and [l-13C]Gly-cine (A) ([2-I3C]-Acetate Incorporation at C-31, C-32, C-33 ( ) See Text) and 13C Chemical Shifts (r)c in ppm Solvent CDC13) of Myxovirescin At [1016],...

Studies of the condensed chromatin fibre structure and the condensation mechanism have resulted in basically two classes of models models based on a helical arrangement of nucleosomes along the fibre and those based on a linear array of globular nucleosome clusters (superbeads) along the fibre. The first class includes the solenoid, twisted ribbon and crossed linker models whereas the latter are the superbead models and related layered structures. Schematic representations of some models are shown in Fig. 10. 

There were common defects in all the polymer parts produced. There was significant polymer tear off that is related to the polymer adhesion to surface. It can be observed that the due to the shear force experienced by the polymer during ejection a portion of the section tore off. This effect was not observed in PS and PMMA as can due to their ductile nature. There was also significant rounding off of high aspect ratio structures. Schematic representation of these two parts defects is shown in Fig. 10 a b. 

Figure Bl.20.9. Schematic representation of DLVO-type forces measured between two mica surfaces in aqueous solutions of KNO3 or KCl at various concentrations. The inset reveals the existence of oscillatory and monotonic structural forces, of which the latter clearly depend on the salt concentration. Reproduced with pennission from [94].

Schematic representation of some of the lower frequencies in the ion-dipole complex for the Cl + MeCl m and the imaginary frequency of the transition structure, calculated using a 6-31G basis set. 

Scheme 1.1. Schematic representation of the Diels-Alder reaction. The versatility of the reaction is illustrated by the fact that heteroatoms are allowed at any of the positions a-f. Structures A and B indicate two regioisomeric products.

Fig. 16. Structure of the 2eolite ZSM-5 (81) (a) framework of the 2eohte (b) schematic representation of the pore stmcture.

Fig. 4-3 Schematic representation of the partial current densities in corrosion in free corrosion (a-c) and with cell formation with foreign cathodic structures (d).

Figure 3.6 Four-helix bundles frequently occur as domains in a proteins. The arrangement of the a helices is such that adjacent helices in the amino acid sequence are also adjacent in the three-dimensional structure. Some side chains from all four helices are buried in the middle of the bundle, where they form a hydrophobic core, (a) Schematic representation of the path of the polypeptide chain in a four-helrx-bundle domain. Red cylinders are a helices, (b) Schematic view of a projection down the bundle axis. Large circles represent the main chain of the a helices small circles are side chains. Green circles are the buried hydrophobic side chains red circles are side chains that are exposed on the surface of the bundle, which are mainly hydrophilic.

Figure 15.18 (a) Schematic representation of the path of the polypeptide chain in the structure of the class I MHC protein HLA-A2. Disulfide bonds are indicated as two connected spheres. The molecule is shown with the membrane proximal immunoglobulin-like domains (a3 and Pzm) at the bottom and the polymorphic al and a2 domains at the top. 

Figure 3.8. Schematic representation of the polystyrene domain structure in styrene-butadiene-styrene triblock copolymers. (After Holden, Bishop and Legge )...

Fig. 12. A, Schematic representation of parallel arrays of polynuclear aromatic hydrocarbon molecules in a mesophase sphere. B, a) isolated mesophasc spheres in an isotropic fluid pitch matrix b) coalescence of mesophase c) structure of semi-coke after phase inversion and solidification.

Warshawsky and coworkers have recently reported the synthesis of a class of compounds which they call polymeric pseudocrown ethers . A chloromethylated polystyrene matrix is used here as in 6.6.2, but instead of adding a crown to the backbone, a strand of ethyleneoxy units is allowed to react at two different positions on the chain, thus forming a crown. Such systems must necessarily be statistical, and the possibility exists for forming interchain bridges as well as intrachain species. Nevertheless, polymers which could be successfully characterized in a variety of ways were formed. A schematic representation of such structures is illustrated below as compound 30. ... 

Figure 4.10 Schematic representation of the (non-planar) structure of some typical crown ethers.

Figure 9,5 Schematic representations of the structures of cyclic melasilicate anions with rf = 3. 4, 6, and 8.

Figure 9.12 Schematic representation of the structures of muscovite mica, (K2Al4(Si6Ali)02o(OH)4], hydrated montmorillonite, [Al4Sig02o(OH)4].xH20 and chlorite, (MgioAl2(Si6Al2)02o(6H)i6], see text.

Figure 12.11 Schematic representation of the structures of polycyclic polyphosphide anions (open circles P, shaded circles P") (a) Pj ", (b) fPj Xr, (c) P8 i. (d) Pii -...

Figure 12.31 Schematic representation of the molecular structure of [P(C3HMes)(02C2H4)Ph] showing the rectangular-based pyramidal disposition of the 5 atoms bonded to P the P atom is 44 pm above the C2O2 plane.

Figure 13.12 Schematic representation of the structure of the complex anion LSbjCIiiO] " showing the two different coordination geometries about Sb and the unique quadruply bridging Cl atom.

Figure 13.13 Schematic representation of the anion structure in M2IAS2F10OJ.H2O.

Figure 13.14 Schematic representation of the structure of (a) the trimeric anion [Sb.iFi203l, and (b) the dimeric anion fAs2F

Figure 14.7 Schematic representation of the structure of the dinuclear cation in [ Co(pyd-ien))202]Lj showing some important dimensions.

Schematic representation of defect clusters in Fei- jO. The normal NaCl-type structure (a) has Fe (small open circles) and O (large dark circles) at alternate comers of the cube. In the 4 1 cluster (h), four octahedral Fe" sites are left vacant and an Fe" ion (grey) occupies the cube centre, thus being tetrahedrally coordinated by the 40. In (c) a more extended 13 4 cluster is shown in which, again, all anion sites are occupied but the 13 octahedral Fe sites are vacant and four Fe occupy a tetrahedral array of cube centres.

Figure 16.13 Structures of some tetrahalides of Se and Te (a) Sep4 (gas), (b) crystalline Sep4, and schematic representation of the association of the pseudo-tbp molecules (see text), (c) coordination environment of Te in crystalline Tep4 and schematic representation of the polymerized square pyramidal units, (d) the tetrameric unit in crystalline (TeCl4)4, and (e) two representations of the tetrameric molecules in Te4li6 showing the shared edges of the Telg octahedral subunits.

Figure 19.30 Schematic representation of the structures of [V( -C5H5)( -C7H7)] and [V( -C7H7)(C0)3] (see text).

Figure 2 Schematic representation of the domain structure of styrene-butadiene-styrene block copolymer.

Fig. 8 Schematic representation of grain structure in the presence of grain-boundary liquid phases.

Schematic representation of the magnetic structure of the Tokamak magnetic confinement device. The lines on the shells represent the direction of the total magnetic field, most of which comes from external coils. The portion that gives the twist, however, comes from current inside the hot plasma itself. The twisting is necessary for stable confinement.

The crystal structure of graphite and amorphous carbon is illustrated by the schematic representations given in Fig. 1. 

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