Three groups that absorb in the 2100-1800-cm-1 infrared spectral region have recently been detected in Ni-hydrogenase from Chromatium vinosum [Bagley, K.A., Duin, E.C., Roseboom, W., Albracht, S. P.J. & Woodruff, W.H. (1995) Biochemistry 34, 5527-5535]. To assess the significance and generality of this observation, we have carried out an infrared-spectroscopic study of eight hydrogenases of thr...

Age at puberty has an important impact on the productive, reproductive and economic efficiency of female cattle. The occurrence of this physiological event implies an adequate growth rate and development of the animal that supports the endocrinological mechanisms that lead to sexual maturity. Age at puberty and first conception will influence lifetime productivity of cattle, reflected in the nu...

The Bering Glacier–Bagley Icefield system in Alaska is currently surging (2011). Large-scale elevation changes and small-scale elevation-change characteristics are investigated to understand surge progression, especially mass transport from the pre-surge reservoir area to the receiving area and propagation of the kinematic surge wave as manifested in heavy crevassing characteristic of rapid, br...

Using airborne and spaceborne high-resolution digital elevation models and laser altimetry, we present estimates of interannual and multi-decadal surface elevation changes on the Bering Glacier system, Alaska, USA, and Yukon, Canada, from 1972 to 2006. We find: (1) the rate of lowering during 1972–95 was 0.9 0.1ma; (2) this rate accelerated to 3.0 0.7ma during 1995–2000; and (3) during 2000–03 ...

In this paper, ideas from the fields of evolution and genetics are incorporated in a new approach to solve heat transfer problems. Biological metaphors have been used as problem-solving strategies in the engineering sciences for well over fifty years (Denning, 1992). Early efforts include the work of Box ( 1957 ) and Friedman (1959). A rigorous mathematical formalism was introduced by Holland a...

Contraction and expansion flows of magnetorheological fluids occur in a variety of smart devices. It is important therefore to learn how these flows can be controlled by means of applied magnetic fields. This paper presents a first investigation into the axisymmetric flow of a magnetorheological fluid through an orifice (so-called abrupt contraction flow). The effect of an external magnetic fie...

Gastric cancer is the second leading cause of cancer worldwide, and almost 800 thousands deaths worldwide every year (IARC, 2008). Almost half of the gastric cancer cases and deaths occur in China, and this cancer ranks the third most common cancer (IARC, 2008). The prognosis of gastric cancer was poor, with 20-30% of 5-year survival rate being attributable to the fact that most cases are diagn...

A recent Health Effects Institute (HEI) study (Bagley, et al., 1996) showed dramatic increases in nanoparticle emissions for a 1991 engine compared to 1988 engine, both running on very low sulfur fuel. This has raised great concerns about very high nanoparticle emissions from modern, low particle mass emission engines. However it is important to recognize that the 1988 engine also produced high...