scholarly journals CRYSTALLIZATION OF SALT-FREE CHYMOTRYPSINOGEN AND CHYMOTRYPSIN FROM SOLUTION IN DILUTE ETHYL ALCOHOL

1948 ◽  
Vol 32 (2) ◽  
pp. 265-269 ◽  
Author(s):  
M. Kunitz
Keyword(s):  
Ammonium Sulfate ◽  
Ethyl Alcohol ◽  
Sulfate Solution ◽  
Enzymatic Properties ◽  
Ammonium Sulfate Solution ◽  
Dilute Solutions

Chymotrypsinogen and chymotrypsin crystallize readily from dilute solutions of ethyl alcohol in the absence of salts. The crystals formed in the presence of alcohol differ in appearance from those formed in the presence of ammonium sulfate. Chymotrypsinogen yields well formed polyhedrons instead of fine needles usually produced in ammonium sulfate solution. Chymotrypsin yields fine needles in the presence of alcohol and rhombohedrons in the presence of ammonium sulfate. The enzymatic properties of the crystals formed in the presence of alcohol are identical with those of the crystals isolated in the presence of ammonium sulfate.

Role of sodium citrate in leaching of low-grade and multiphase zinc oxide ore in ammonia–ammonium sulfate solution

2017 ◽  
Vol 169 ◽  
pp. 534-541 ◽  
Author(s):  
Kun Yang ◽  
Libo Zhang ◽  
Chao Lv ◽  
Jinhui Peng ◽  
Shiwei Li ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Ammonium Sulfate ◽  
Sodium Citrate ◽  
Sulfate Solution ◽  
Low Grade ◽  
Ammonium Sulfate Solution

Research on Raman Spectral Characteristics and Mechanism of Ammonium Sulfate Solution

2014 ◽  
Vol 34 (3) ◽  
pp. 0330004
Author(s):  
孙松 Sun Song ◽  
蔡廷栋 Cai Tingdong ◽  
刘莹 Liu Ying ◽  
王静静 Wang Jingjing ◽  
叶勇 Ye Yong ◽  
...  
Keyword(s):  
Ammonium Sulfate ◽  
Spectral Characteristics ◽  
Sulfate Solution ◽  
Ammonium Sulfate Solution ◽  
Raman Spectral

Amniotic fluid phosphatidylglycerol and phosphatidylinositol separated by stepwise-development thin-layer chromatography.

1980 ◽  
Vol 26 (2) ◽  
pp. 277-281
Author(s):  
M Mitnick ◽  
B DeMarco ◽  
J M Gibbons
Keyword(s):  
Thin Layer ◽  
Amniotic Fluid ◽  
Thin Layer Chromatography ◽  
Ammonium Sulfate ◽  
Sulfate Solution ◽  
Chromatographic Technique ◽  
Ammonium Sulfate Solution ◽  
Stepwise Development ◽  
Layer Chromatography ◽  
Phosphorus Determination

Abstract We describe a stepwise-development thin-layer-chromatographic technique for separating phosphatidylglycerol and phosphatidylinositol in samples of amniotic fluid. Plates are prepared from silica gel G slurried in a 50 g/L ammonium sulfate solution. Phospholipid phosphorus determination is not needed. Phospholipid phosphorus determination is not needed. Phosphatidylglycerol and phosphatidylinositol, measured densitometrically, are expressed as ratios to the sphingomyelin present. These ratios are correlated with the lecithin/sphingomyelin ratio and age of gestation in normal and abnormal pregnancies.

scholarly journals The Novel Strategy for Increasing the Efficiency and Yield of the Bipolar Membrane Electrodialysis by the Double Conjugate Salts Stress

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 343 ◽  
Author(s):  
Dong Wang ◽  
Wenqiao Meng ◽  
Yunna Lei ◽  
Chunxu Li ◽  
Jiaji Cheng ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Cation Exchange ◽  
Ammonium Sulfate ◽  
Sodium Sulfate ◽  
Sulfate Solution ◽  
Anion Exchange Membrane ◽  
Ammonium Sulfate Solution ◽  
Bipolar Membrane ◽  
Bipolar Membrane Electrodialysis ◽  
Exchange Membrane

To improve sulfuric acid recovery from sodium sulfate wastewater, a lab-scale bipolar membrane electrodialysis (BMED) process was used for the treatment of simulated sodium sulfate wastewater. In order to increase the concentration of sulfuric acid (H2SO4) generated during the process, a certain concentration of ammonium sulfate solution was added into the feed compartment. To study the influencing factors of sulfuric acid yield, we prepared different concentrations of ammonium sulfate solution, different feed solution volumes, and different membrane configurations in this experiment. As it can be seen from the results, when adding 8% (NH4)2SO4 into 15% Na2SO4 under the experimental conditions where the current density was 50 mA/cm2, the concentration of H2SO4 increased from 0.89 to 1.215 mol/L, and the current efficiency and energy consumption could be up to 60.12% and 2.59 kWh/kg, respectively. Furthermore, with the increase of the volume of the feed compartment, the concentration of H2SO4 also increased. At the same time, the configuration also affects the final concentration of the sulfuric acid; in the BP-A-C-BP (“BP” means bipolar membrane, “A” means anion exchange membrane, and “C” means cation exchange membrane; “BP-A-C-BP” means that two bipolar membranes, an anion exchange membrane, and a cation exchange membrane are alternately arranged to form a repeating unit of the membrane stack) configuration, a higher H2SO4 concentration was generated and less energy was consumed. The results show that the addition of the double conjugate salt is an effective method to increase the concentration of acid produced in the BMED process.

scholarly journals Recalibration of the Gilford Absorbance Indicator

1967 ◽  
Vol 13 (5) ◽  
pp. 423-425
Author(s):  
H Bruce Collier
Keyword(s):  
Ammonium Sulfate ◽  
Sulfate Solution ◽  
Potassium Chromate ◽  
Ammonium Sulfate Solution ◽  
Blue Glass ◽  
Cobalt Blue

Abstract The Gilford Absorbance Indicator was recalibrated, for absolute absorbance readings, with (1) a U. S. Bureau of Standards calibrated cobalt-blue glass standard; (2) a standard cobalt ammonium sulfate solution at 512 mµ (3) standard potassium chromate solutions at 373 mµ These three standards agreed with 1%. Readings on the indicator's absorbance scale had decreased by about 7% over 2 years.

Corrosion mechanism of copper immersed in ammonium sulfate solution

2018 ◽  
Vol 69 (11) ◽  
pp. 1597-1608 ◽  
Author(s):  
Kun Li ◽  
Zhuoyuan Chen ◽  
Jiarun Li ◽  
Xiaoying Sun ◽  
Fengling Xu ◽  
...  
Keyword(s):  
Ammonium Sulfate ◽  
Sulfate Solution ◽  
Corrosion Mechanism ◽  
Ammonium Sulfate Solution
Sign in / Sign up

Export Citation Format

Share Document