A non-phosgene process for bioderived polycarbonate with high molecular weight and advanced property profile synthesized using amino acid ionic liquids as catalysts

2020 ◽  
Vol 22 (8) ◽  
pp. 2534-2542 ◽  
Author(s):  
Zhencai Zhang ◽  
Fei Xu ◽  
Yaqin Zhang ◽  
Chenhao Li ◽  
Hongyan He ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ionic Liquids ◽  
Amino Acid ◽  
High Molecular Weight ◽  
Property Profile

Bio-based polycarbonate with high molecular weight and advanced property profile was synthesized using amino acid ionic liquids as catalysts.

scholarly journals Biosynthesis of glycoproteins by membranes of Acer pseudoplatanus. Incorporation of mannose and N-acetylglucosamine

1980 ◽  
Vol 192 (2) ◽  
pp. 569-577 ◽  
Author(s):  
J Barr ◽  
P Nordin
Keyword(s):  
Molecular Weight ◽  
Amino Acid ◽  
High Molecular Weight ◽  
Gel Permeation Chromatography ◽  
Monosaccharide Composition ◽  
Paper Electrophoresis ◽  
Acer Pseudoplatanus ◽  
Gel Permeation ◽  
Chloroform Methanol ◽  
Insoluble Pellet

Membrane preparations from Acer pseudoplatanus suspension cultures were demonstrated to incorporate radioactivity from GDP-[U-14C]mannose and UDP-N-acetyl-[6-(3)H]glucosamine into high-molecular-weight polymers characterized as glycoprotein. From 20 to 25% of the 14C was incorporated as fucose with the remainder as mannose, whereas 90% of the 3H was incorporated as N-acetylglucosamine with the remainder as N-acetylgalactosamine. Pronase digestion yielded radioactive glycopeptides that were separated into four fractions by gel-permeation chromatography and paper electrophoresis. The isolated glycopeptides differed in molecular weight and isotopes incorporated, as well as in amino-acid and monosaccharide composition. The membrane preparation also incorporated radioactivity from the added nucleotides into chloroform/methanol (2:1, v/v)- and chloroform/methanol/water (10:10:3, by vol.)-soluble lipids, and into an insoluble pellet.

scholarly journals The crystalline yolk-platelet proteins and their soluble plasma precursor in an amphibian, Xenopus laevis

1971 ◽  
Vol 124 (4) ◽  
pp. 759-766 ◽  
Author(s):  
M. R. Redshaw ◽  
B. K. Follett
Keyword(s):  
Molecular Weight ◽  
Amino Acid ◽  
Xenopus Laevis ◽  
Amino Acid Composition ◽  
High Molecular Weight ◽  
Molecular Rearrangement ◽  
Yolk Proteins ◽  
Platelet Protein ◽  
Yolk Platelet ◽  
Preparative Ultracentrifugation

A single lipophosphoprotein complex, vitellogenin, was isolated and purified from the plasma of oestrogen-stimulated female toads by preparative ultracentrifugation and chromatography on TEAE-cellulose (triethylaminoethylcellulose). The protein contains 12% lipid, 1.5% phosphorus, 1.6% calcium and smaller amounts of carbohydrates and biliverdin. In amino acid composition it is identical with total yolk-platelet protein. The platelet protein, however, is fractionated on TEAE-cellulose into two components, a high-molecular-weight lipovitellin and a smaller phosvitin. Analyses of the soluble plasma vitellogenin suggest that it is a complex of two phosvitin molecules covalently bound to one lipovitellin dimer, and that it is the immediate precursor of the yolk proteins, into which it is converted by a molecular rearrangement. Uptake of vitellogenin from the plasma into the growing oocyte, and its subsequent crystallization as a yolk platelet, appear to be enhanced by gonadotrophic hormones.

scholarly journals Stucture of the amino-acid accepting 3'-end of high-molecular-weight eggplant mosaic virus RNA.

1976 ◽  
Vol 73 (3) ◽  
pp. 737-741 ◽  
Author(s):  
J. P. Briand ◽  
K. E. Richards ◽  
J. P. Bouley ◽  
J. Witz ◽  
L. Hirth
Keyword(s):  
Molecular Weight ◽  
Amino Acid ◽  
Mosaic Virus ◽  
High Molecular Weight ◽  
Virus Rna

scholarly journals Specific Amino Acid Substitutions in the Proline-Rich Motif of the Rhizobium meliloti ExoP Protein Result in Enhanced Production of Low-Molecular-Weight Succinoglycan at the Expense of High-Molecular-Weight Succinoglycan

1998 ◽  
Vol 180 (2) ◽  
pp. 395-399 ◽  
Author(s):  
Anke Becker ◽  
Alfred Pühler
Keyword(s):  
Molecular Weight ◽  
Amino Acid ◽  
High Molecular Weight ◽  
Rhizobium Meliloti ◽  
Low Molecular Weight ◽  
Amino Acid Substitutions ◽  
Wild Type ◽  
Specific Amino Acid ◽  
Enhanced Production ◽  
Mutant Strains

ABSTRACT The production of the acidic exopolysaccharide succinoglycan (EPS I) by Rhizobium meliloti exoP* mutants expressing an ExoP protein lacking its C-terminal cytoplasmic domain and by mutants characterized by specific amino acid substitutions in the proline-rich motif (RX4PX2PX4SPKX9IXGXMXGXG) located from positions 443 to 476 of the ExoP protein was analyzed. The absence of the C-terminal cytoplasmic ExoP domain (positions 484 to 786) and the substitution of both arginine443 by isoleucine443 and proline457 by serine457 within the proline-rich motif resulted in enhanced production of low-molecular-weight (LMW) EPS I at the expense of high-molecular-weight (HMW) EPS I. The ratios of HMW to LMW EPS I of the wild type and mutant strains increased with osmolarity.

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