Evidence is growing to support a functional role for the prion protein (PrP) in copper metabolism. Copper ions appear to bind to the protein in a highly conserved octapeptide repeat region (sequence PHGGGWGQ) near the N terminus. To delineate the site and mode of binding of Cu(II) to the PrP, the copper-binding properties of peptides of varying lengths corresponding to 2-, 3-, and 4-octarepeat ...

The electronic absorption, electronic circular dichroism and X-ray absorption spectroscopy of the blue copper protein plastocyanin is studied with density functional theory, time-dependent density functional theory and multireference configuration interaction in conjunction with classical molecular dynamics simulations. A strong correlation is observed between the excitation energy of the inten...

In this note, the dimensions of elliptic and semielliptic tubes in which capillary rise starts oscillating about its Jurin’s height are determined. Comparisons with classical circular semicircular made.

Excessive noise generated by roller coasters during operation is a significant issue for amusement parks located near residential and business districts. Previous work showed that filling the rails with sand and pea gravel can provide noise reduction levels of up to 10 and 15 decibels. However, using damping materials may require additional support structures to accommodate the weight increase ...

We report distinct growth regimes of hollow silica fibers formed by hydrodynamic injection of cupric sulfate into silicate solution. The tubes grow either steadily along a continuous jet of buoyant solution or through relaxation oscillations that are governed by chemo-mechanical processes. The dependence of the oscillation period on flow rate and copper concentration is explained in the framewo...

SYNOPSIS The free and total plasma copper and total erythrocyte copper levels have been determined by simple, yet sensitive and highly specific methods, using atomic absorption spectrophotometry. For total copper determination, the copper was split from its protein combination in plasma or red cells by the action of hydrochloric acid at room temperature. The liberated copper was chelated by amm...

The fouling characteristics of micron-scale magnesium oxide particles on the inside wall circular tube and converging-diverging are studied in this paper. An improved method for modeling tubes was developed based Eulerian method. particle deposition mechanism model includes: diffusion deposition, turbulent thermophoretic gravity deposition. verified by comparison with experimental results from ...

Cupronickel 90/10 alloy has been used world wide as a standard material in heat recovery tubes. The alloy exhibits excellent service characteristics and can also withstand flow up to 3.3 m / sec of seawater. This alloy (Cupronickel, 90/10) was used in the construction of Jeddah IV heat recovery section of desal condenser tubes. Jeddah IV desal unit has 4 modules, each module consists of 21 stag...