Grey sphere

Figure Bl.8.4. Two of the crystal structures first solved by W L Bragg. On the left is the stnicture of zincblende, ZnS. Each sulphur atom (large grey spheres) is surrounded by four zinc atoms (small black spheres) at the vertices of a regular tetrahedron, and each zinc atom is surrounded by four sulphur atoms. On the right is tire stnicture of sodium chloride. Each chlorine atom (grey spheres) is sunounded by six sodium atoms (black spheres) at the vertices of a regular octahedron, and each sodium atom is sunounded by six chlorine atoms.

Phosphate release from actin. (a) Monomeric actin with ADP and Pi bound. The protein backbone (tube), ADP (grey spheres), and Ca -Pi (black spheres) are shown. The orientation of the spring indicates the pulling direction during P, unbinding. (b) Force exerted on the deprotonated (solid line) and protonated (dashed line) phosphate during the SMD simulations. 

FIG. 19 Scheme of a simple fluid confined by a chemically heterogeneous model pore. Fluid modecules (grey spheres) are spherically symmetric. Each substrate consists of a sequence of crystallographic planes separated by a distance 8 along the z axis. The surface planes of the two opposite substrates are separated by a distance s,. Periodic boundary conditions are imposed in the x and y directions (see text) (from Ref. 77). 

Fig. 21.21 The oxygen atoms coordination of the two different Ba sites in Ba3BP30- 2 (Ba atoms, black spheres O atoms, grey spheres).

Figure 5.11 Individual transferrin receptor domains. Ribbon diagrams for domain I, the protease-like domain (a) domain II, the apical domain (b) and domain III, the helical domain (c). Secondary structure elements are labelled and are referred to in the text first with respect to the domain number, then with respect to the linear order of the elements within the domain. For example aI-3 refers to the third helix in the first domain. In (a), the two grey spheres indicate the positions that would be occupied by Zn2+ in an authentic protease. Reprinted with permission from Lawrence et ah, 1999. Copyright (1999) American Association for the Advancement of Science.

Fig. 27 Shape of crystalline domains at 330 K after 6.4 ns (grey spheres). The crystalline lamellae are found to have rather flat 100 surfaces. Also shown are newly added stems (black spheres) during the next 0.128 ns of simulation. The addition of the stems starts preferentially at kink sites... 

Figure 29 The solid-state structure of Li2[ZnMe4]. The grey spheres represent the methyl groups.

Scheme 4.2 (a-c) Schematic representation of topologic organization of 3d-4f chains. 4f and 3d ions as black and grey spheres, respectively. 

Figure 4.11 Representation of [Ni2(H20)2(valpn)2Dy2(tfa)3]4CH3CN n. Dy and Ni atoms as dark and grey spheres, respectively, H atoms omitted for clarity. (Redrawn from Ref. [107], Published by Royal Society of Chemistry.)...

Ni(L)Ln(N03)2(H20)Fe(Tp )(CN)3]-2CH3CN-CH3OH n-Ln, Fe and Ni atoms as dark, grey and light grey spheres, respectively. FI atoms omitted for clarity, (b) Temperature... 

Fig. 1 Typical snapshot of a protein-like copolymer macromolecule, in which H monomeric units are shown as dark grey spheres and P units are shown as light grey spheres (adopted from [13])... 

Fig. 3.6-9. Representation of the cluster core of [C PSiBuhk 31. The black spheres (Cu atoms) form a cuboctahedron, the grey spheres (P atoms) an octahedron. The white spheres...

Figure 9.5 Views of the structures that can be formed by phospholipids in aqueous solution. The grey spheres depict the hydrophilic heads of phospholipids, and the squiggly lines the hydrophobic tails.

Figure 10. Lowest energy equilibrium geometries and calculated adsorption energies of CO molecules on neutral Au clusters with 5

FIGURE 1.30 The CsCl unit cell. Cs, blue sphere Cl, grey spheres (or vice versa). 

FIGURE 1.32 The close-packed layers in NaCl. Na, blue spheres Cl, grey spheres. 

FIGURE 1.36 (a) The unit cell of nickel arsenide, NiAs. (For undistorted hep c/a=1.633, but this ratio is found to vary considerably.) Ni, blue spheres As, grey spheres, (b) The trigonal prismatic coordination of arsenic in NiAs. 

FIGURE 1.38 The crystal structure of wurtzite, ZnS. Zn, blue spheres S, grey spheres. 

FIGURE 1.50 (a) The crystal structure of CO2, (b) packing diagram of the unit cell of CO2 projected on to the xy plane. The heights of the atoms are expressed as fractional coordinates of c. C, blue spheres 0, grey spheres. 

FIGURE 1.51 The crystal structure of ice. H, blue spheres 0, grey spheres. 

Figure 2.52. (a) The bilayer ice structure on metal surfaces. Dark and grey spheres represent atoms. Half of the water molecules bind directly through the oxygen to the surface metal atoms. The remaining molecules are displaced toward the vacuum in the H-up configuration, (b) The flat ice structure on metal surfaces with atoms in Pt— and Pt—HO bonding water molecules, respectively. From Ref. [106]. 

The boundary condition (4.2.8) is also called the grey sphere - in contrast to the earlier-considered black sphere, equation (3.2.16), which is its limiting... 

Fig. 6.10 Glycinylurea guest molecules (green) dock onto the urea-functionalised, niche-like periphery (red) of a POPAM dendrimer (shown schematically as grey sphere, with 32 terminal groups) owing to tailor-made supramolecular interactions (red bonds) (according to Meijer el al.)...

Fig. 19 Formation of the dimeric coordination capsule 28 based on the calixarene ligand 27. The helical twist results from the orientation of the meta-substituted pyridyl units upon coordination to palladium(II) ions (represented by grey spheres). Adapted with permission from [141]. Copyright 2001 American Chemical Society...

Scheme 18 Metal-mediated cleavage of "mTc-labelled biomolecules from a solid-phase support (grey spheres). Unlabelled biomolecules remain bound, whereas labelled ones only are partially cleaved...

Figure 13 Representation of an idealised [MnII9(p,-CN)30-Mov 6] cluster core. The light grey spheres represent Mn(II) ions and the darker spheres represent Mo(V) ions and the bonds between them represent p,-cyano ligands [70],...

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