نتایج جستجو برای: سیستم ni

تعداد نتایج: 126467  

Journal: :Biochemistry 2010
Güneş Bender Troy A Stich Lifen Yan R David Britt Stephen P Cramer Stephen W Ragsdale

Acetyl-CoA synthase (ACS) catalyzes the synthesis of acetyl-CoA from CO, coenzyme A (CoA), and a methyl group from the CH(3)-Co(3+) site in the corrinoid iron-sulfur protein (CFeSP). These are the key steps in the Wood-Ljungdahl pathway of anaerobic CO and CO(2) fixation. The active site of ACS is the A-cluster, which is an unusual nickel-iron-sulfur cluster. There is significant evidence for t...

Journal: :Dalton transactions 2013
Lei Yang Yu Huo Jingyang Niu

The hydrothermal reactions of α-K(4)SiW(12)O(40) with NiCl(2)·6H(2)O yielded two unprecedented silicotungstates containing a triangular inorganic Ni(6) core. Furthermore, Na(2)[Ni(6)(μ(3)-OH)(3)(H(2)O)(9)SiW(9)O(34)](2)·17H(2)O (1) presents a rare dimer, in which two SiW(9) units sandwich double Ni(6) cores by W-O-Ni linking instead of conventional Ni-O-Ni.

2008
Hai Xie

In the title compound, [Ni(C(20)H(22)N(2)O(4))]·H(2)O, the Ni(II) ion and the water mol-ecule are located on a twofold rotation axis. The Ni ion is coordinated by two N [Ni-N = 1.8462 (18) Å] and two O [Ni-O = 1.8645 (14) Å] atoms in a distorted square-planar geometry. The water mol-ecule and the Ni complex mol-ecule are paired via O-H⋯O hydrogen bonds.

2004
Robert A. Herrmann

Let {S′Ni | i ∈ IN} represent a set of consequence operators defined on a language Λ, where each member of {S′Ni | i ∈ IN} corresponds to a science-community physical theory and each Ni is a S′Nj -system for each j ∈ IN. It is shown that there exists a hyperfinite ultralogic U ∈ ∗Cf defined on all internal subsets of Λ such that U 6 = U, and, for each i, j ∈ IN, S Ni ( ∗Nj) = U( ∗Nj). For each ...

2011
G. Y. Gou J. W. Bennett H. Takenaka A. M. Rappe

We use a combination of conventional density functional theory (DFT) and post-DFT methods, which include the local density approximation plus Hubbard U (LDA + U ), PBE0, and self-consistent GW, to study the electronic properties of Ni-substituted PbTiO3 (Ni-PTO) solid solutions. We find that LDA calculations yield unreasonable band structures, especially for Ni-PTO solid solutions that contain ...

Journal: :Journal of the American Chemical Society 2011
Carl A Laskowski Alexander J M Miller Gregory L Hillhouse Thomas R Cundari

An exceptionally low coordinate nickel imido complex, (IPr*)Ni═N(dmp) (2) (dmp = 2,6-dimesitylphenyl), has been prepared by the elimination of N2 from a bulky aryl azide in its reaction with (IPr*)Ni(η6-C7H8) (1). The solid-state structure of 2 features two-coordinate nickel with a linear C−Ni−N core and a short Ni−N distance, both indicative of multiple-bond character. Computational studies us...

2004
Robert A. Herrmann

Let {S′Ni | i ∈ IN} represent a set of consequence operators defined on a language Λ, where each member of {S′Ni | i ∈ IN} corresponds to a science-community physical theory and each Ni is a S′Nj -system for each j ∈ IN. It is shown that there exists a hyperfinite ultralogic U ∈ ∗Cf defined on all internal subsets of Λ such that U 6 = U, and, for each i, j ∈ IN, S Ni ( ∗Nj) = U( ∗Nj). For each ...

2008
J. Pons

This paper intends to review the state-of-the-art in the field of ferromagnetic shape memory alloys different than Ni–Mn–Ga, developed in the ast years. It starts with the effects of additions of different fourth elements to Ni–Mn–Ga and continues with the review of other Heusler (or B2) i-based and Co-based alloy systems, like Ni–Mn–X, Ni–Fe–Ga, Co–Ni–Al and Co–Ni–Ga alloys. Finally, ferromagn...

2006
Kazunori Kakehi Suguru Noda Shohei Chiashi Shigeo Maruyama

Fe, Co, and Ni are catalytically effective for growing single-walled carbon nanotubes (SWNTs). On substrates, however, Ni tends to yield only multi-walled carbon nanotubes. Because enhanced surface diffusion at the elevated growth temperature required for deposition might cause coarsening of Ni catalyst nanoparticles, adjusting the nominal Ni thickness should be crucial for controlling the part...

1998
P. L. Cao D. E. Ellis V. P. Dravid

The bonding structure and binding character for the initial stage of thin film growth of Ni on a rutile(110) surface are studied using first principles density functional theory. Our results show that, in the first monolayer, Ni atoms are preferentially adsorbed on top of bridging oxygen atoms, and upon secondary surface oxygen. The bond strength between Ni adatom and substrate is much stronger...

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