Inhibition of soil urease activity by amido derivatives of phosphoric and thiophosphoric acids

1985 ◽  
Vol 85 (1) ◽  
pp. 149-152 ◽  
Author(s):  
C. F. -H. Liao ◽  
S. G. Raines
Keyword(s):  
Urease Activity ◽  
Soil Urease ◽  
Derivatives Of

Improving Efficiency of Urea Fertilizers by Inhibition of Soil Urease Activity

2002 ◽  
Author(s):  
S. Kiss ◽  
M. Simihăian
Keyword(s):  
Urease Activity ◽  
Soil Urease

Inhibition of soil urease activity and nitrification with some metallic cations

Soil Research ◽  
1986 ◽  
Vol 24 (4) ◽  
pp. 527 ◽  
Author(s):  
DS Yadav ◽  
V Kumar ◽  
M Singh
Keyword(s):  
Urease Activity ◽  
Nitrification Rate ◽  
Clay Loam ◽  
Inhibitory Effects ◽  
Soil Urease ◽  
Metallic Cations

Investigations to study the effects of 14 metallic cations on urease activity and nitrification rate in Hansi clay loam (Typic Ustochrepts) were undertaken at Haryana Agricultural University, Hissar, Haryana (India). The metallic cations inhibited soil urease activity, and the order of effectiveness varied when compared at 100, 500 and 1000 ppm. Increasing levels of metallic cations adversely affected the urease activity. Inhibitory effects of metallic cations at 1000 pprn decreased in order: Ag+ = Hg2+ > Cu2+ >Cd2+ > Co2+ >Ba2+ > Zn2+ > Ni2+ > Fe2+ > Cr3+ > Mn2+ > Sr2+ > Pb2+ > Al3+. Effects of Cr3+, Cu2+ and Hg2+ on nitrification were also tested. Above 80% of added N was nitrified at 21 days in the control (urea alone) and 100 ppm Cr3+ treatments, whereas addition of 500 and 1000 pprn cr2+ and 100, 500 and 1000 pprn Cu2+ delayed nitrification. A considerable amount of NH+4- remained unchanged in Hg2+ -treated soils after 28 days of incubation; these soils also contained more residual NO-2 than other treatments.

EFFECTS OF CATECHOL AND P-BENZOQUINONE ON THE HYDROLYSIS OF UREA AND ENERGY BARRIERS OF UREASE ACTIVITY IN SOILS

1984 ◽  
Vol 64 (1) ◽  
pp. 51-60 ◽  
Author(s):  
J. S. TOMAR ◽  
A. F. MacKENZIE
Keyword(s):  
Activation Energy ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Key Words ◽  
Urease Activity ◽  
Urea Hydrolysis ◽  
Urease Inhibitors ◽  
Soil Urease ◽  
Hydrolysis Of ◽  
Hydrolysis Of Urea

The effects of the urease inhibitors, catechol and p-benzoquinone, and temperature on the hydrolysis of urea in five soils were investigated in a laboratory study. Urea hydrolysis decreased significantly with the amount of inhibitors applied and increased significantly with each 5 °C increase in temperature from 5 to 25 °C. The effectiveness of inhibitors generally decreased with increases in temperature from 5 to 25 °C. The correlation of hydrolysis of urea with organic matter contents of the soils was highly significant (r = 0.67** to 0.86**). Both catechol and p-benzoquinone tended to increase the energies and entropies of activation of soil urease and the effect was enhanced with a decrease in soil organic matter. It is suggested that an increase in the activation energy of the soil urease as a result of inhibitor use was related to an increase in the effectiveness of the inhibitor. Key words: Urease inhibitors, urea hydrolysis, energy of activation

Relationships Between Soil Urease Activity and Other Soil Properties

1977 ◽  
Vol 41 (2) ◽  
pp. 350-352 ◽  
Author(s):  
M. I. Zantua ◽  
L. C. Dumenil ◽  
J. M. Bremner
Keyword(s):  
Soil Properties ◽  
Urease Activity ◽  
Soil Urease

Effect of Heavy Metals Cu, Cd, Pb and Zn on Enzyme Activity and Microbial Biomass Carbon in Brown Soil

2014 ◽  
Vol 1073-1076 ◽  
pp. 726-730 ◽  
Author(s):  
Lei Yu ◽  
Jie Min Cheng
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Enzyme Activity ◽  
Microbial Biomass ◽  
Catalase Activity ◽  
Urease Activity ◽  
Microbial Biomass Carbon ◽  
Biomass Carbon ◽  
Brown Soil ◽  
Soil Urease

To get more sensitive index for making scientific and objective judgment on heavy metal pollution in brown soil, the influence which heavy metals Cu, Cd, Pb and Zn exert on soil urease, catalase activity and microbial biomass carbon content were evaluated by means of laboratory simulation.Experiment results showed that urease activity firstly increased with the addition of Cu, Cd and Pb, then showed decline trends. But for Zn, the activity of urease was obviously decline with the increased Zn concentrations. Catalase activity firstly increased with the addition of Cu then showed decline trend. But for Cd, Pb and Zn, the activity of catalase obviously declined. Microbial biological carbon all showed decline trends with the addition of Cu, Cd, Pb and Zn.

Development of Schiff bases from Amikacin: Synthesis, Antibacterial, Anti-urease Activities and Molecular Docking Studies

2020 ◽  
Vol 17 (12) ◽  
pp. 1579-1588
Author(s):  
Shabana Anwar ◽  
Mohsin Abbas Khan ◽  
Irshad Ahmed ◽  
Irfan Pervaiz ◽  
Hamid Saeed Shah
Keyword(s):  
Helicobacter Pylori ◽  
Schiff Bases ◽  
Urease Activity ◽  
Micrococcus Luteus ◽  
Biological Activities ◽  
Biologically Active ◽  
Diffusion Method ◽  
Standard Drug ◽  
Urease Enzyme ◽  
Derivatives Of

Background: The use of antibiotics has compromised due to the appearance of multidrug- resistant strains and decreased susceptibility of strains to antibiotics. Antibiotic resistance has become a worldwide threat as well as Helicobacter pylori induced gastric cancer is a major problem nowadays. Therefore, it is the need of time to synthesize potent anti-urease motifs. Introduction: Schiff bases represent a large class of biologically active compounds that exhibited a broad spectrum of biological activities. Amikacin is an important drug used against multidrugresistant species of microbes. Therefore, imine derivatives of amikacin may help to reduce the resistance of microbes and to treat the Helicobacter pylori induced stomach problems by inhibiting the Helicobacter Pylori Urease enzyme. Methods: Schiff bases of amikacin were synthesized and screened for in-vitro antibacterial assay performed by well diffusion method against Bacillus megaterium (Bm), Bacillus subtilis (Bs), Stenotrophomonas maltophilia (Sm), Staphylococcus aureus (Sa), Micrococcus luteus (Ml), Serratia marcescens (S. mar), Escherichia coli (E. coli) and anti-urease activity was performed by Indophenol method. Structures confirmed by IR, 1HNMR and 13CNMR spectroscopy. Results: Compounds showed varying degrees of antibacterial effects. Schiff bases A2 and A8 exhibited potent urease inhibition activity with Ki values 0.2754 and 0.2908 μM, respectively and their binding affinity was calculated as greater than the standard drug. Conclusion: Derivatives of amikacin with aromatic rings were more active antibacterials than those with an aliphatic side chain. The potent anti-urease activity has been recorded for compounds A2 and A8. Therefore, they may serve as lead compounds in the discovery of Helicobacter pylori Urease inhibitors.

Effect of methyl iodide fumigation on soil urease activity

2009 ◽  
Vol 17 (3) ◽  
pp. 616-618
Author(s):  
Yun ZHAO ◽  
Qiu-Xia WANG ◽  
Mei-Xia GUO ◽  
Zhao-Xin SONG ◽  
Ao-Cheng CAO
Keyword(s):  
Methyl Iodide ◽  
Urease Activity ◽  
Soil Urease
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