Pocket squares

Sheet Mica. Pockets of mica crystals ranging in size from a few square centimeters to several square meters are found in pegmatite sills and dikes or granodiorite (alaskite) ore bodies. In order to be used industrially, manufacturers must be able to cut a 6 cm pattern in the mica. "Books" of mica, ranging from 12.9 to 645 cm or more, are cut from the crystals. The books can be punched into various shapes and spHt into thicknesses varying from 0.0031 to 0.010 cm (12). The highest quaUty micas maybe used in aerospace computers, and those of lower quaUty find use as insulators in electrical apphances. 

Rotary V lve Feeders. Devices known as rotary valve feeders are commonly used for circular or square configured outlets. These are particularly useful when discharging materials to a pneumatic conveying system where a seal is required to prevent air flow through the hopper outlet. The discharge rate is set by the speed of rotation of the vanes or pockets of the valve. 

Brazil. Brazil has two principal crystalline flake mines, a smaller one at Itapecerica and a larger one at Pedra Azul, both in Minas Gerais State. Both mines are owned by Nacional de Grafite Ltd. The ore at Itapecerica averages 20% carbon and is surface mined from a number of pockets spread over an area of ca 129.5 km (50 square miles). The ore at Pedra Azul averages 7% carbon, is larger flaked than the other, and is disserninated in heavily weathered gneissic rock. 

B An individual pocket of porosity shall not exceed the lesser of Ttt /3 or Vh in in its greatest dimension. The total area of porosity projected radially through the weld shall not exceed an area equivalent to 3 times the area of a single npaximum pocket allowable in any square inch (645 mnr) of projected weld area. 

Each heme unit in myoglobin and hemoglobin contains one ion bound to four nitrogen donor atoms in a square planar arrangement. This leaves the metal with two axial coordination sites to bind other ligands. One of these sites is bound to a histidine side chain that holds the heme in the pocket of the protein. The other axial position is where reversible binding of molecular oxygen takes place. 

Fig. 11. Schematic of DNA bp steps in the minor groove, indicating possible locations of electrostatic pockets (shaded regions). Shading is proportional to the putative efficacy of the binding. Electronegative atoms are indicated by circles and hydrogen atoms by squares. Reproduced with permission from Ref. (41). Copyright 1997, American Chemical Society.

Strip designs are very basic as the emerging units are either square or rectangular strips. The pocket area is critical to the diameter, shape, and thickness of the product. The pocket area is extended when the product... 

Fig. 19. A plot of the root-mean-square (rms) deviation of backbone atoms between HO-1 molecules A and B in the asymmetric unit. There is a large deviation in the distal helix just above the heme. In molecule B the distal helix is farther from the heme, thereby providing a more open pocket. Such flexibility may be required for substrate binding and product release. The required flexibility is very likely due to the conserved Gly residues in the distal helix.

Fig. 7.18. Source of shrinkage stresses (a) rigid inclusion embedded in a matrix (b) resin pockets surrounded by fibers in hexagonal and square arrays. After Hull (1981).

One problem with the use of acetylene is its stability. Although it is stable at normal pressures and temperatures, if it is subjected to pressures as low as 15pounds per square inch gauge (psig) it can explode. To minimize the stability problem, acetylene transport is minimized. Acetylene contained in pressurized cylinders for welding and cutting is dissolved in acetone. A typical acetylene cylinder contains a porous filler made from a combination of materials such as wood chips, diatomaceous earth, charcoal, asbestos, and Portland cement. Synthetic fillers are also available. Acetone is placed in the cylinder and fills the voids in the porous material. Acetylene can then be pressurized in the cylinders up to approximately 250 pounds per square inch (psi) In a pressurized cylinder, 1 titer of filler can hold a couple of hundred titers of acetylene, which stabilizes it. Acetylene cylinders should not be stored on their sides because this could cause the acetone to distribute unequally and create acetylene pockets. 

Table 8.2 Root mean square deviation (RMSD) of the backbone of the aligned models of the h AR. The main difference among the models is due to the loops, which represent the most variable region of the templates and consequently of the models. Particular attention has to be given to EL2 because it is part of the binding pocket and it can directly interact with ligands...

This micro device consists of a square micro chamber which has as a bottom plate a conventional DNA micro-array chip sealed by a cover slip with double-sided adhesive tape (see Figure 1.26) [24], The adhesive tape serves as a spacing gasket to define the shape and dimensions of the chamber. The cover slip contains the air pockets with a uniform, pitched distribution. The air pockets trap the air bubbles... 

In the met form, the two ferric ions are bridged by an oxo ligand and the carboxylate side chain of a glutamate residue. The Fel atom has a distorted square pyramidal geometry, alternately characterized as pseudo-octahedral if the aspartate residue is assigned as chelating bi-dentate, whereas Fe2 has nearly perfect octahedral symmetry. In the active form of the enzyme, Tyr 122 has been oxidized to a tyrosyl radical (9), which, as revealed by the X-ray structure of met R2, is located in a hydrophobic pocket with its hydroxyl group 5.3 A away from Fel. The pocket does not contain any oxidizable side chains near the radical site... 

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