scholarly journals Iron oxyhydroxide aerogels and xerogels by controlled hydrolysis of FeCl3·6H2O in organic solvents: stages of formation

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 72716-72727
Author(s):  
I. Lázár ◽  
A. Szilágyi ◽  
G. Sáfrán ◽  
Á. Szegedi ◽  
S. Stichleutner ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Organic Media ◽  
Gel Formation ◽  
Iron Oxyhydroxide ◽  
Transient Species ◽  
Early Stages ◽  
Hydrolysis Of ◽  
Controlled Hydrolysis

Transient species appear in early stages of hydrolysis of iron in organic media with simultaneous progress of gel formation.

scholarly journals Iron Oxyhydroxide Aerogels and Xerogels by Hydrolysis of FeCl3 ∙ 6 H2O in Organic Media: Early Stages

2015 ◽  
Vol 88 (4) ◽  
pp. 413-419
Author(s):  
Károly Lázár ◽  
István Lázár ◽  
György Sáfrán ◽  
Anett Szilágyi
Keyword(s):  
Organic Media ◽  
Iron Oxyhydroxide ◽  
Early Stages ◽  
Hydrolysis Of

Metallo-Organics Derived Tractable Resins for Ybco Superconducting Fiber Fabrication

1990 ◽  
Vol 180 ◽  
Author(s):  
K.C. Chen ◽  
A.Y. Chen ◽  
K. S. Mazdiyasni
Keyword(s):  
Viscous Fluid ◽  
Organic Solvents ◽  
Single Phase ◽  
Ceramic Fibers ◽  
Fiber Fabrication ◽  
Polar Organic Solvents ◽  
Yttrium Isopropoxide ◽  
Hydrolysis Of ◽  
Controlled Hydrolysis

ABSTRACTSoluble resins were prepared by controlled hydrolysis of yttrium isopropoxide, barium isopropoxide and copper ethylhexanoate. The resins were converted to cohesive, viscous, fluid and precipitated states by the addition of different combinations of binary polar and non-polar organic solvents. Viscosity and spinnability of the resins were critically dependent on the solvent constituents. Continuous pre-ceramic fibers were spun from these resins and single phase YBa2Cu3Oy superconducting fibers with Tc=91.5K and ΔT=1.5K have been obtained.

scholarly journals Characterization of Glycoside Hydrolase Family 5 Proteins in Schizosaccharomyces pombe

2010 ◽  
Vol 9 (11) ◽  
pp. 1650-1660 ◽  
Author(s):  
Encarnación Dueñas-Santero ◽  
Ana Belén Martín-Cuadrado ◽  
Thierry Fontaine ◽  
Jean-Paul Latgé ◽  
Francisco del Rey ◽  
...  
Keyword(s):  
Cell Wall ◽  
Schizosaccharomyces Pombe ◽  
Protein Characterization ◽  
Wall Material ◽  
Glycoside Hydrolase Family ◽  
Content Type ◽  
Hydrolysis Of ◽  
Controlled Hydrolysis ◽  
Hydrolase Family

ABSTRACT In yeast, enzymes with β-glucanase activity are thought to be necessary in morphogenetic events that require controlled hydrolysis of the cell wall. Comparison of the sequence of the Saccharomyces cerevisiae exo-β(1,3)-glucanase Exg1 with the Schizosaccharomyces pombe genome allowed the identification of three genes that were named exg1 + (locus SPBC1105.05), exg2 + (SPAC12B10.11), and exg3 + (SPBC2D10.05). The three proteins have different localizations: Exg1 is secreted to the periplasmic space, Exg2 is a membrane protein, and Exg3 is a cytoplasmic protein. Characterization of the biochemical activity of the proteins indicated that Exg1 and Exg3 are active only against β(1,6)-glucans while no activity was detected for Exg2. Interestingly, Exg1 cleaves the glucans with an endohydrolytic mode of action. exg1 + showed periodic expression during the cell cycle, with a maximum coinciding with the septation process, and its expression was dependent on the transcription factor Sep1. The Exg1 protein localizes to the septum region in a pattern that was different from that of the endo-β(1,3)-glucanase Eng1. Overexpression of Exg2 resulted in an increase in cell wall material at the poles and in the septum, but the putative catalytic activity of the protein was not required for this effect.

scholarly journals Influence of Water Activity on Protease Adsorbed on Biochar in Organic Solvents

2017 ◽  
Vol 6 (4) ◽  
pp. 96 ◽  
Author(s):  
Hidetaka Noritomi ◽  
Jumpei Nishigami ◽  
Nobuyuki Endo ◽  
Satoru Kato ◽  
Katsumi Uchiyama
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Organic Solvents ◽  
Water Activity ◽  
Initial Rate ◽  
Butyl Ester ◽  
Nitrogen Atmosphere ◽  
Bamboo Charcoal ◽  
Influence Of Water ◽  
Hydrolysis Of

We have found that the organic solvent-resistance of Alpha-chymotrypsin (Alpha-CT) is enhanced by adsorbing Alpha-CT onto bamboo charcoal powder (BCP), which is obtained by pyrolyzing bamboo waste under nitrogen atmosphere, and is markedly dependent on the thermodynamic water activity (aw) in organic solvents. When BCP-adsorbed　Alpha-CT was immersed in acetonitrile at an appropriate water activity, it effectively enhanced the transesterification of N-acetyl-L-tyrosine ethyl ester (N-Ac-Tyr-OEt) with n-butanol (BuOH) to produce N-acetyl-L-tyrosine butyl ester (N-Ac-Tyr-OBu), compared to the hydrolysis of N-Ac-Tyr-OEt with water to give N-acetyl-L-tyrosine (N-Ac-Tyr-OH). When the water activity was 0.28, the initial rate of transesterification catalyzed by BCP-adsorbed Alpha-CT was about sixty times greater than that catalyzed by free Alpha-CT. Regarding the reaction selectivity which is defined as a ratio of the initial rate of transesterification to that of hydrolysis, BCP-adsorbed α-CT was much superior to free Alpha-CT. The catalytic activity of BCP-adsorbed Alpha-CT was markedly dependent on the reaction temperature. Furthermore, concerning the thermal stability at 50 oC, the half-life of BCP-adsorbed Alpha-CT exhibited 3.8-fold, compared to that of free Alpha-CT.

scholarly journals Production of Xylo-oligosaccharides (XOS) by controlled hydrolysis of Xylan using immobilized Xylanase from Aspergillus niger with improved properties

2018 ◽  
Vol 5 (4) ◽  
Author(s):  
Caio C. Aragon ◽  
Ana I. Ruiz-Matute ◽  
Nieves Corzo ◽  
Rubens Monti ◽  
Jose M. Guisán ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
Hydrolysis Of ◽  
Controlled Hydrolysis
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