High-Nuclearity Ni-Substituted Polyoxometalates: A Series of Poly(polyoxotungstate)s Containing 20-22 Nickel Centers

2011 ◽  
Vol 17 (46) ◽  
pp. 13032-13043 ◽  
Author(s):  
Xin-Xiong Li ◽  
Shou-Tian Zheng ◽  
Jie Zhang ◽  
Wei-Hui Fang ◽  
Guo-Yu Yang ◽  
...  
Keyword(s):  
Nickel Centers

Poly(polyoxotungstate)s with 20 Nickel Centers: From Nanoclusters to One-Dimensional Chains

2009 ◽  
Vol 48 (39) ◽  
pp. 7176-7179 ◽  
Author(s):  
Shou-Tian Zheng ◽  
Jie Zhang ◽  
Juan Modesto Clemente-Juan ◽  
Da-Qiang Yuan ◽  
Guo-Yu Yang
Keyword(s):  
One Dimensional ◽  
Nickel Centers

An Unusual Example of Hypervalent Silicon: A Five-Coordinate Silyl Group Bridging Two Palladium or Nickel Centers through a Nonsymmetrical Four-Center Two-Electron Bond

2013 ◽  
Vol 126 (4) ◽  
pp. 1121-1126 ◽  
Author(s):  
Ainara Nova ◽  
Hee-Won Suh ◽  
Timothy J. Schmeier ◽  
Louise M. Guard ◽  
Odile Eisenstein ◽  
...  
Keyword(s):  
Silyl Group ◽  
Nickel Centers

EPR of nickel centers in SrCl2:Ni

1986 ◽  
Vol 135 (1) ◽  
pp. K63-K67 ◽  
Author(s):  
R. Alcalá ◽  
R. Cases ◽  
P. J. Alonso
Keyword(s):  
Nickel Centers

Innentitelbild: Poly(polyoxotungstate)s with 20 Nickel Centers: From Nanoclusters to One-Dimensional Chains (Angew. Chem. 39/2009)

2009 ◽  
Vol 121 (39) ◽  
pp. 7238-7238
Author(s):  
Shou-Tian Zheng ◽  
Jie Zhang ◽  
Juan Modesto Clemente-Juan ◽  
Da-Qiang Yuan ◽  
Guo-Yu Yang
Keyword(s):  
One Dimensional ◽  
Nickel Centers

scholarly journals Explaining Urease Specificity Towards Nickel: A Re-Analysis of Its Proposed Mechanism

2020 ◽  
Author(s):  
Millena Pereira Ferreira ◽  
Caio Bezerra de Castro ◽  
Caterina Gruenwaldt Cunha Marques Netto
Keyword(s):  
Catalytic Reaction ◽  
Catalytic Efficiency ◽  
Careful Analysis ◽  
Rate Enhancement ◽  
Nickel Centers

Urease is a binuclear metalloenzyme selective towards nickel, exhibiting a remarkable rate enhancement of the catalytic reaction. The accepted mechanism for urease describes the coordination of urea to both nickel centers in an O,N bridged mode, enabling the attack of the carbonyl by a bridged hydroxide present between the metallic centers. However, the substitution of nickel by other metals significantly reduces urease´s catalytic efficiency. The proposed mechanism cannot explain this difference in activity since it does not follow a rational nucleophilicity scale. After a careful analysis of the literature data on thermodynamics, kinetics, inhibition, and mutations, we verified that by analyzing the mechanism from a diffrent angle, another pathway is most likely occuring. This mechanism can explain urease´s selectivity towards nickel and all the data present in the literature, gathering amost a century of study about urease.

Electron thermal emission rates of nickel centers in silicon

1986 ◽  
Vol 29 (9) ◽  
pp. 883-884 ◽  
Author(s):  
M. Jaraiz ◽  
S. Dueñas ◽  
J. Vicente ◽  
L. Bailón ◽  
J. Barbolla
Keyword(s):  
Thermal Emission ◽  
Emission Rates ◽  
Nickel Centers

Nickel centers in strontium tartrate tetrahydrate single crystals

Physica B+C ◽  
1983 ◽  
Vol 122 (1) ◽  
pp. 67-73 ◽  
Author(s):  
N. Satyanarayana ◽  
K. Hariharan ◽  
S. Radhakrishna
Keyword(s):  
Single Crystals ◽  
Nickel Centers

Saturation magnetization of the nickel centers in urease

1989 ◽  
Vol 36 (3-4) ◽  
pp. 305 ◽  
Author(s):  
E.P. Day ◽  
J. Peterson ◽  
M.J. Todd ◽  
R.P. Hausinger
Keyword(s):  
Saturation Magnetization ◽  
Nickel Centers
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