Ridge forming

The most common way of packing a helices is by fitting the ridges formed by a row of residues separated in sequence by four in one helix into the same type of grooves in the other helix. In this case the ridges and... 

Volcanic ridge formed of dacite and rhyolite lavas with minor basalts, trachybasalts and andesites. 

Well see later that the thiol-disulfide interconversion is extremely important in biochemistry, where disulfide l>ridges form the cross-links between protein chains that help stabilize the three-dimensional conformations of proteins. 

Figure 17 Packing of a helices. Ridges and grooves on the surfaces of a helices lead to three main types of interaction, with angles of 80° (ridges formed by side chains i and j + 3), 60° (ridges formed by side chains i and i+4) or 20° (ridges formed by side chains i and ( + 5) between the main axes of the helices, as shown...

Upstream slope failed. Blocks moved 30-150 ft. Multiple shear zones found similar to deep-seated liquefaction in Anchorage. No pressure ridge formed. Trenched upstream face to 60 ft. Strong evidence of liquefaction near bottom of trench (mixing of soils at 70 ft). N-value typically less than 25 at 70 ft. Believed 20-ft layer near base liquefied... 

Covers for extended casing sections of U or vee form are generally flat, and folded over the sides of the casing for stiffness. Ridged forms are sometimes used to shed water on weatherproof constructions, or for stiffness on extra wide casings as used for multiple screw feeders. Hinged covers facilitate easy access, but protection for safe opening and, in the case of heavy covers, the avoidance of uncontrolled closure, should be incorporated, Fig. 6.4. 

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