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Rheology and gel point of the enzymatic hydrolysis of urea in the presence of urease
R. Serrato-Millán,L. Medina-Torres,F. Calderas,B.L. España-Sánchez,M. Estevez,A.R. Hernandez-Martínez,M. Cruz-Soto,I.C. Sánchez,R. Gómez-García,I. Sánchez-Betancourt,M.C. Velasquillo-Martínez,G. Luna- 한국유변학회 2017 Korea-Australia rheology journal Vol.29 No.1
This study reports on the rheology of the gelation kinetics of raw chitosan (CTS) solutions (2% w/v) produced by enzymatic hydrolysis of urea at different urea concentrations (40, 50, 60, 80, and 100 mM) in the presence of urease at 1 U/mL. Viscoelastic parameters and pH values were evaluated during gelation process and the rheological properties of CTS hydrogels produced were monitored after 24 h at 37°C to simulate human body temperatures. pH measurements suggest that above some critical urea concentration (50 mM) the time required (tgel) to reach the critical pH gelation shows no dependence on urea concentration (tgel was ca. 70 minutes). Above 50 mM of urea concentration, CTS hydrogels exhibit an elastic modulus G' higher than the viscous modulus G'' with no frequency dependence characteristic of a gel behavior. Gelation kinetics analyzed by rheology suggest that the G' (i.e., structure) development depends on urea concentration during solution neutralization.
Hmok H´Linh,Betancourt I.,Martínez-Aguilar E. 한국물리학회 2023 Current Applied Physics Vol.45 No.-
This theoretical work presents magnetic, electronic and optical properties of SrFe12-xAlxO19 (x = 0.5; 1; 1.5) solid solutions using first-principles calculations based on density functional theory. A decrease in the magnetic properties of SrFe12O19 is predicted when doped with the Al ions. It was found that the Al ions preferentially replace Fe ions at 2a and 12k sites. On the other hand, SrFe11.5Al0.5O19 and SrFe11Al1O19 solid solutions behave like a semiconductor, while SrFe10.5Al1.5O19 solid solution showed a metallic response. From the optical analysis, incorporating the Al ions can benefit the polarizability of the medium. For the SrFe11.5Al0.5O19 (Al[2a]) and SrFe11Al1O19 (Al[2a-2a]) solid solutions, the incorporation of Aluminum ions results in the reduction of the gap, making it a more useful material for catalytic applications.
Scaling properties at freeze-out in relativistic heavy-ion collisions
Aggarwal, M. M.,Ahammed, Z.,Alakhverdyants, A. V.,Alekseev, I.,Alford, J.,Anderson, B. D.,Anson, C. D.,Arkhipkin, D.,Averichev, G. S.,Balewski, J.,Barnby, L. S.,Beavis, D. R.,Bellwied, R.,Betancourt, American Physical Society 2011 PHYSICAL REVIEW C - Vol.83 No.3