Hydrogenase [hydrogenase: (acceptor) oxidoreductase, EC 1.12. . -1 is present in many bacteria. It is one of the enzymes having potential use in the biophotolysis of water (Weaver et al.. 1980). When we began our research on hydrogenase in 1977, two types of enzymes were known: (i) enzymes containing 12 Fe atoms and an equivalent amount of acid-labile S atoms and (ii) enzymes containing only fo...

OBJECTIVE The aims of the study are to assess the marginal accuracy of base metal and titanium alloy casting and to evaluate the effect of repeated ceramic firing on the marginal accuracy of base metal and titanium alloy castings. MATERIALS AND METHODS Twenty metal copings were fabricated with each casting material. Specimens were divided into 4 groups of 10 each representing base metal alloy...

The asymptotic properties of four estimators for nonlinear mixed-e¤ects models are investigated: maximum likelihood estimator (MLE), an estimator based on the ...rst-order approximation to the expectation function (Vonesh and Carter (1992)), the two-stage, and the Lindstrom-Bates (1990) estimators. Two asymptotic situations are considered: (i) when N ! 1 and ni is ...nite, (ii) N ! 1 and minni ...

Assume 〈א0,א1〉 → 〈λ, λ +〉. Assume M is a model of a first order theory T of cardinality at most λ+ in a vocabulary L(T ) of cardinality ≤ λ. Let N be a model with the same vocabulary. Let ∆ be a set of first order formulas in L(T ) and let D be a regular filter on λ. Then M is ∆-embeddable into the reduced power N/D, provided that every ∆-existential formula true in M is true also in N . We obt...

The functional properties of materials can arise from local structural features that are not well determined or described by crystallographic methods based on long-range average structural models. The room temperature (RT) structure of the Bi perovskite Bi2Mn4/3Ni2/3O6 has previously been modeled as a locally polar structure where polarization is suppressed by a long-range incommensurate antife...

Herein, NiO-decorated Ni nanowires with diameters ca. 30-150 nm derived from Ni wire backbone (ca. 2 μm in diameter) is directly synthesized on commercially available Ni foam as a renovated anode for Li-ion batteries. Excellent stability with capacity 680 mAh g(-1) at 0.5C (1C = 718 mA g(-1)) is achieved after 1000 cycles. Superior rate capability is exhibited by cycling at extremely high curre...

Superconductivity that spontaneously breaks time-reversal symmetry (TRS) has been found, so far, only in a handful of 3D crystals with bulk inversion symmetry. Recently, spontaneous TRS breaking was observed in a 2D superconducting system without inversion symmetry: the epitaxial bilayer films of bismuth and nickel [1]. The evidence comes from the onset of the polar Kerr effect at the supercond...

The effects of microstructures during creep on the ultrasonic attenuation have been investigated for Ni based superalloy (IN738LC). The cuboidal γ′ precipitates in the virgin material became coarsened preferentially in the direction perpendicular to the applied stress axis as creep time increased. The length of γ′ precipitates increased with creep time, while the width increased slightly. The i...

WILLIAM BAND Yenching University, Peiping, China October 4, 1945 of the ferromagnetic alloys of Cu, Ni, Co, Fe, Mn, and the Heusler alloys, now permits a fairly decisive estimate of k8* for these elements and also a rough picture of the d-band head forms. In Table I, fzo ev represents the equivalent depth of the vacant levels in the d-band, obtained by producing the curve with its actual height...