Spectral luminescence investigation of the degree of polymerization of phosphate glasses

1972 ◽  
Vol 17 (6) ◽  
pp. 1584-1587
Author(s):  
M. B. Rzhevskii ◽  
M. I. Kuz'menkov ◽  
V. V. Pechkovskii ◽  
S. V. Plyshevskii
Keyword(s):  
Degree Of Polymerization ◽  
Phosphate Glasses ◽  
Luminescence Investigation ◽  
Spectral Luminescence

Physicochemical, spectral, luminescence, and stimulated emission properties of phosphate glasses with high neodymium concentrations

1976 ◽  
Vol 6 (10) ◽  
pp. 1220-1222 ◽  
Author(s):  
S Kh Batygov ◽  
Yu K Voronko ◽  
B I Denker ◽  
A A Zlenko ◽  
Aleksandr Ya Karasik ◽  
...  
Keyword(s):  
Phosphate Glasses ◽  
Stimulated Emission ◽  
Emission Properties ◽  
Spectral Luminescence

Spectral-Luminescence Investigation of Strontium Molybdate Crystal Doped with Ho3+and Tm3+ Ions

2015 ◽  
Author(s):  
L.I. Ivleva ◽  
E.E. Dunaeva ◽  
M.E. Doroshenko ◽  
P.G. Zverev ◽  
A.V. Nekhoroshikh ◽  
...  
Keyword(s):  
Luminescence Investigation ◽  
Spectral Luminescence

Structure and dynamics of phosphate glasses

1998 ◽  
Vol 77 (2) ◽  
pp. 357-362 ◽  
Author(s):  
A. Matic, L. Borjesson
Keyword(s):  
Phosphate Glasses ◽  
Structure And Dynamics

SPECTRAL LUMINESCENCE PROPERTIES OF CdS NANOCOMPOSITES IN A POLYMER SHELL

2017 ◽  
Vol 8 (2) ◽  
pp. 171-180
Author(s):  
Dm. A. Pomogailo ◽  
M. G. Spirin ◽  
V. M. Skobeeva ◽  
G. I. Dzhardimalieva ◽  
S. I. Pomogailo ◽  
...  
Keyword(s):  
Luminescence Properties ◽  
Polymer Shell ◽  
Cds Nanocomposites ◽  
Spectral Luminescence

The Pattern of Acetylation Defines the Priming Activity of Chitosan Tetramers

2019 ◽  
Author(s):  
Sven Basa ◽  
Malathi Nampally ◽  
Talita Honorato ◽  
Subha Narayan Das ◽  
Appa Rao Podile ◽  
...  
Keyword(s):  
Biological Activity ◽  
Degree Of Polymerization ◽  
Chitosan Oligosaccharides ◽  
Degree Of Acetylation ◽  
Bona Fide ◽  
First Time ◽  
Priming Activity

The biological activity of chitosans depends on their degree of polymerization (DP) and degree of acetylation (DA). However, information could also be carried by the pattern of acetylation (PA): the sequence of <i>β</i>-1,4-linked glucosamine (deacetylated/D) and <i>N</i>-acetylglucosamine (acetylated/A) units. To address this hypothesis, we prepared partially-acetylated chitosan oligosaccharides from a chitosan polymer (DA=35%, DP<sub>w</sub>=905) using recombinant chitosan hydrolases with distinct substrate and cleavage specificities. The mixtures were separated into fractions DP4–DP12, which were tested for elicitor and priming activities in rice cells. We confirmed that both activities were influenced by DP, <a>but also observed apparent DA-dependent priming activity, with the ADDD+DADD fraction proving remarkably effective</a>. We then compared all four mono-acetylated tetramers prepared using different chitin deacetylases and observed significant differences in priming activity. This demonstrates for the first time that PA influences the biological activity of chitosans, which can now be recognized as <i>bona fide</i> information-carrying molecules

The Pattern of Acetylation Defines the Priming Activity of Chitosan Tetramers

2019 ◽  
Author(s):  
Sven Basa ◽  
Malathi Nampally ◽  
Talita Honorato ◽  
Subha Narayan Das ◽  
Appa Rao Podile ◽  
...  
Keyword(s):  
Biological Activity ◽  
Degree Of Polymerization ◽  
Chitosan Oligosaccharides ◽  
Degree Of Acetylation ◽  
Bona Fide ◽  
First Time ◽  
Priming Activity

The biological activity of chitosans depends on their degree of polymerization (DP) and degree of acetylation (DA). However, information could also be carried by the pattern of acetylation (PA): the sequence of <i>β</i>-1,4-linked glucosamine (deacetylated/D) and <i>N</i>-acetylglucosamine (acetylated/A) units. To address this hypothesis, we prepared partially-acetylated chitosan oligosaccharides from a chitosan polymer (DA=35%, DP<sub>w</sub>=905) using recombinant chitosan hydrolases with distinct substrate and cleavage specificities. The mixtures were separated into fractions DP4–DP12, which were tested for elicitor and priming activities in rice cells. We confirmed that both activities were influenced by DP, <a>but also observed apparent DA-dependent priming activity, with the ADDD+DADD fraction proving remarkably effective</a>. We then compared all four mono-acetylated tetramers prepared using different chitin deacetylases and observed significant differences in priming activity. This demonstrates for the first time that PA influences the biological activity of chitosans, which can now be recognized as <i>bona fide</i> information-carrying molecules

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