The Structure of the Elusive Urease–Urea Complex Unveils the Mechanism of a Paradigmatic Nickel‐Dependent Enzyme

2019 ◽  
Vol 58 (22) ◽  
pp. 7415-7419 ◽  
Author(s):  
Luca Mazzei ◽  
Michele Cianci ◽  
Stefano Benini ◽  
Stefano Ciurli
Keyword(s):  
Urea Complex

Study of Photocatalytic Dergradation, Kinetics and Microbial Activities of Copper (ii) Soya Urea Complex in Non Aqueous Media

2020 ◽  
Vol 17 ◽  
Author(s):  
Vandana Sukhadia ◽  
Rashmi Sharma ◽  
Asha Meena
Keyword(s):  
Staphylococcus Aureus ◽  
Photocatalytic Degradation ◽  
Degradation Kinetics ◽  
Waste Water Treatment ◽  
Aqueous Media ◽  
Research Work ◽  
Solvent Polarity ◽  
Urea Complex ◽  
Pseudo First Order Reaction ◽  
Aqueous Solvent

Aims: The aim of this research work is to synthesise, study and analyse photocatalytic degradation, kinetics and microbial activity of new surfactant Copper (II) soya urea complex(CSU). Background: Photocatalytic degradation has attracted the attention of scientific community throughout the world due to its multiple applications in environment, energy, waste water treatment, pollution control, green chemistry, etc. Copper (II) soya urea complex has been synthesized and characterized through FT-IR, NMR, ESR studies. Objective: Present work deals with the study of photocatalytic degradation of Copper (II) soya urea complex by using ZnO as semiconductor. This study employs a semiconductor catalyst using non polar and non aqueous solvent in photocatalytic degradation. Reaction rate is chosen as the photocatalytic activity, which has been governed by several factors. Antibacterial activities of Copper (II) complex have also been studied against Staphylococcus aureus. Method: Optical density (O.D.) was measured after different time intervals spectrophotometrically to measure the degradation of complex. Mueller-Hinton agar medium was used for antimicrobial activity of synthesized compound at different concentrations by disk/ well diffusion susceptibility testing. Result: Plot of 2+log O.D. (absorbance) versus time was plotted and found linear. The heterogeneous photocatalysis followed pseudo-first-order reaction kinetics.The present study suggests that Copper (II) soya urea (CSU) complex shows antibacterial activity against Staphylococcus aureus at different concentrations. Conclusion: The results were used to determine the rate of photocatalytic degradation of CSU complex .It has been found that rate of degradation varies with different parameters like concentration of complex, amount of catalyst, light intensity, solvent polarity etc. CSU complex derived from soyabean oil has been shown an inhibitory effect on the growth of S. aureus which may causes skin disease.

Photocatalytic Degradation and Antibacterial Study of Copper(II) Mustard Thiourea Complex

2020 ◽  
Vol 10 (3) ◽  
pp. 229-242
Author(s):  
Vandana Sukhadia ◽  
Rashmi Sharma ◽  
Asha Meena
Keyword(s):  
Photocatalytic Degradation ◽  
Skin Diseases ◽  
Polar Solvent ◽  
Degradation Kinetics ◽  
Research Work ◽  
Solvent Polarity ◽  
Inhibitory Effect ◽  
Mustard Oil ◽  
Urea Complex ◽  
Pseudo First Order Reaction

Aims: The aim of this research work is to synthesise, study and analyse photocatalytic degradation, kinetics. Background: Copper(II) mustard thio urea complex has been synthesized and characterized through FT-IR, NMR, ESR studies. Objective: Photocatalytic degradation of copper(II) mustard thio urea complex was studied in the presence of ZnO as a catalyst in the solution form, using a non polar solvent benzene and a polar solvent methanol with different compositions. Antibacterial activities of copper(II) complex have also been studied against Staphylococcus aureus. Method: O.D. was measured after different time intervals spectrophotometrically to measure the degradation of the complex. Result: Plot of 2+ log O.D. (absorbance) versus time was plotted and found to be linear. The heterogeneous photocatalysis followed pseudo-first-order reaction kinetics. The present study suggests that the CMT complex shows antibacterial activity at different concentrations. Conclusion: The rate of photocatalytic degradation of CMT complex was studied and analyzed. It has been found that the rate of degradation varies with different parameters like the concentration of complex, the amount of catalyst, light intensity, solvent polarity etc. The CMT complex derived from natural mustard oil has shown an inhibitory effect on the growth of S. aureus which may cause skin diseases.

Upper limit of urea complex formation with n-heptane in the presence of n-1-heptene

1975 ◽  
Vol 11 (2) ◽  
pp. 97-98
Author(s):  
T. A. Volkova ◽  
I. D. Makhinya ◽  
A. I. Bogatova ◽  
V. A. Matishev
Keyword(s):  
Complex Formation ◽  
Urea Complex ◽  
Upper Limit

Crystal structure of a calcium sulfate-urea complex

1975 ◽  
Vol 5 (4) ◽  
pp. 215-226 ◽  
Author(s):  
J. P. R. Villiers ◽  
J. C. A. Boeyens
Keyword(s):  
Crystal Structure ◽  
Calcium Sulfate ◽  
Urea Complex

Emission Spectra of the Chromium(III) Hexa Urea Complex

1963 ◽  
Vol 37 (1_2) ◽  
pp. 109-114 ◽  
Author(s):  
G. B. Porter ◽  
H. L. Schläfer
Keyword(s):  
Emission Spectra ◽  
Urea Complex

The preparation and crystal structure of a polymeric (1 : 1)-silver nitrate-urea complex, [(AgNO3)2(CH4N2O)2]n

Polyhedron ◽  
1992 ◽  
Vol 11 (1) ◽  
pp. 49-52 ◽  
Author(s):  
Dalius S. Sagatys ◽  
Raymond C. Bott ◽  
Graham Smith ◽  
Karl A. Byriel ◽  
Colin H.L. Kennard
Keyword(s):  
Crystal Structure ◽  
Silver Nitrate ◽  
Urea Complex
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