Ammonia treatment of straw via the hydrolysis of urea. II. Additions of soya bean (urease), sodium hydroxide and molasses; effects on the digestibility of urea-treated straw

1984 ◽  
Vol 11 (2) ◽  
pp. 115-124 ◽  
Author(s):  
P.E.V. Williams ◽  
G.M. Innes ◽  
A. Brewer
Keyword(s):  
Sodium Hydroxide ◽  
Soya Bean ◽  
Ammonia Treatment ◽  
Hydrolysis Of ◽  
Hydrolysis Of Urea

Deinking of recycled paper by coupling of the enzyme endo-β-1,4-D-glucanasa and the cellulose, and by using a laboratory flotation column

MRS Advances ◽  
2020 ◽  
Vol 5 (52-53) ◽  
pp. 2669-2678
Author(s):  
Jeovani González P. ◽  
Ramiro Escudero G
Keyword(s):  
Amino Acids ◽  
Sodium Hydroxide ◽  
Paper Industry ◽  
Computational Simulation ◽  
Cellulose Fibers ◽  
Residual Water ◽  
Chemical Reagent ◽  
Recycled Paper ◽  
Flotation Column ◽  
Hydrolysis Of

AbstractDeinking of recycled office (MOW) paper was carried out by using a flotation column and adding separately sodium hydroxide, and the enzyme Cellulase Thricodema Sp., as defibrillators.The de-inked cellulose fibers were characterized according to the standards of the paper industry, to compare the efficiency of the deinking of each chemical reagent used to hydrolyze the fibers and defibrillate them.The computational simulation of the molecular coupling between the enzyme and cellulose was performed, to establish the enzyme-cellulose molecular complex and then to identify the principal amino-acids of endo-β-1,4-D-glucanase in this molecular link, which are responsible for the hydrolysis of the cellulose.Experimental results show the feasibility to replace sodium hydroxide with the enzyme Cellulase Thricodema Sp., by obtaining deinked cellulose with similar optical and physical properties.The use of the enzyme instead of sodium hydroxide avoids the contamination of the residual water; in addition to that, the column is operated more easily, taking into consideration that the pH of the system goes from alkaline to neutral.

Preparation and Properties of (Hydroxymethyl)boronic Acid and its Pinanediol Ester

2011 ◽  
Vol 64 (11) ◽  
pp. 1425 ◽  
Author(s):  
Donald S. Matteson
Keyword(s):  
Nmr Spectroscopy ◽  
Asymmetric Synthesis ◽  
Sodium Hydroxide ◽  
Isotope Effect ◽  
Boronic Acid ◽  
Efficient Route ◽  
The Stability ◽  
Hydrolysis Of

Hydrolysis of diisopropyl (bromomethyl)boronate followed by reaction with pinanediol provides an efficient route to pinanediol (hydroxymethyl)boronate (12), a useful intermediate for asymmetric synthesis. The stability of (hydroxymethyl)boronic acid (10) and its ester 12 have been examined by NMR spectroscopy. Heating for 1 h in acidic D2O does not degrade 10 and only affects the pinanediol moiety of 12. Base does not degrade 10 or 12 in several days at 20–25°C, but converts either to DCH2OD and CH3OD in a few h at 90–98°C, with a large H/D isotope effect. Pinanediol (bromomethyl)boronate with sodium hydroxide in D2O yields a gross mixture of products.

scholarly journals Discussion on the Scheme of Preparing Ammonia Gas by Hydrolysis of Urea

2019 ◽  
Vol 612 ◽  
pp. 042034
Author(s):  
Jingcheng Su ◽  
Fangming Xue ◽  
Feng Chen ◽  
Yiqing Sun ◽  
Xiuru Liu
Keyword(s):  
Ammonia Gas ◽  
Hydrolysis Of ◽  
Hydrolysis Of Urea

The differentiation of Trichophyton rubrum and T. mentagrophytes by use of Christensen's urea broth

1971 ◽  
Vol 17 (7) ◽  
pp. 911-913 ◽  
Author(s):  
Julius Kane ◽  
J. B. Fischer
Keyword(s):  
Urease Activity ◽  
Trichophyton Rubrum ◽  
Agar Medium ◽  
Phenol Red ◽  
Depressing Effect ◽  
Fluid Medium ◽  
Maximum Change ◽  
Pure Cultures ◽  
Hydrolysis Of ◽  
Hydrolysis Of Urea

A comparison of the urease activity of 56 strains of T. rubrum and 64 strains of T. mentagrophytes on Christensen's urea medium with and without agar incubated 7 days at 28 °C showed that characteristic and consistent results are produced on this medium without agar. In the fluid medium T. mentagrophytes caused a rise in pH, resulting in a maximum change of the phenol red, and T. rubrum produced no change. The depressing effect of agar on the hydrolysis of urea was demonstrated. On the agar medium 9 (18.8%) of 48 strains of T. mentagrophytes and 3 (6.2%) of 48 strains of T. rubrum produced doubtful results. It is important that pure cultures be used for the test.

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