Production and molecular weight characteristics of alginate from free and immobilized-cell cultures of Azotobacter vinelandii

2002 ◽  
Vol 37 (8) ◽  
pp. 895-900 ◽  
Author(s):  
N Saude ◽  
G.-A Junter
Keyword(s):  
Molecular Weight ◽  
Cell Cultures ◽  
Azotobacter Vinelandii ◽  
Immobilized Cell ◽  
Molecular Weight Characteristics

Synthesis and molecular-weight characteristics of n-vinylpyrrolidone and 2-methyl-5-vinylpyridine copolymers

2012 ◽  
Vol 46 (8) ◽  
pp. 478-481 ◽  
Author(s):  
S. A. Kedik ◽  
A. V. Panov ◽  
I. V. Sakaeva ◽  
Yu. V. Kochkina(Cherta) ◽  
D. V. Eremin ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Characteristics

scholarly journals Chitosan Elicitation for Enhancing of Vincristine and Vinblastine Accumulation in Cell Culture of Catharanthus roseus (L.) G. Don

2018 ◽  
Vol 10 (12) ◽  
pp. 287
Author(s):  
Pawnpirun Pliankong ◽  
Padungsak Suksa-Ard ◽  
Surawit Wannakrairoj
Keyword(s):  
Molecular Weight ◽  
Cell Culture ◽  
Stationary Phase ◽  
Liquid Medium ◽  
Cell Cultures ◽  
Catharanthus Roseus ◽  
Dry Weight ◽  
Shrimp Shell ◽  
Anti Cancer ◽  
Herbal Plant

Catharanthus roseus (L.) G. Don is an important herbal plant. There are two important alkaloids, vinblastine and vincristine, use in anti-cancer drugs. In this study production of the two alkaloids was enhanced in C. roseus cell cultures, in a Murashige and Skoog (MS) liquid medium supplemented with 1.5 mg/L 2,4-D, 0.5 mg/L kinetin and 30 g/L sucrose, by adding 0, 50, 100, 250 or 500 mg/L medium molecular weight chitosan or chitosan derived from shrimp shell. After 14 days of culture, the cell suspension at stationary phase in the 100 mg/L medium molecular weight chitosan could produce the highest amounts of vinblastine and vincristine at 4.15 and 5.48 µg/mg cell dry weight, respectively. At the same time, the controls (0 mg/L chitosan) produced the two alkaloids at only 2.43 and 2.49 µg/mg cell dry weight, respectively. For chitosan from shrimp shell, it was found that 100 mg/L chitosan could lead to the highest quantity of 4.09 µg vinblastine/mg cell dry weight. The highest amount of 5.47 µg vincristine/mg cell dry weight was obtained when 250 mg/L chitosan was added.

CATIONIC COPOLYMERIZATION OF ISOBUTYLENE WITH ISOPRENE: KINETICS OF THE PROCESS AND DETERMINATION OF KINETIC CONSTANTS

2015 ◽  
Vol 88 (4) ◽  
pp. 574-583 ◽  
Author(s):  
N. V. Ulitin ◽  
K. A. Tereshchenco ◽  
D. A. Shiyan ◽  
G. E. Zaikov
Keyword(s):  
Experimental Data ◽  
Molecular Weight ◽  
Cationic Polymerization ◽  
Methyl Chloride ◽  
Theoretical Description ◽  
Kinetic Constants ◽  
Molecular Weight Characteristics ◽  
Cationic Copolymerization ◽  
Kinetics Of

ABSTRACT A theoretical description has been developed of the kinetics of isobutylene with isoprene (IIR) cationic polymerization in the environment of methyl chloride on aluminum trichloride as the catalyst. Based on experimental data on the kinetics of copolymerization (isobutylene conversion curve) and the molecular weight characteristics of the copolymer of IIR, kinetic constants for the process were found. Adequacy of the developed theoretical description of the kinetics of the IIR copolymerization process was confirmed by comparing the experimental molecular-weight characteristics calculated by this description, independent characteristics, and IIR unsaturation.

Melt fracture of linear low-density polyethylenes: Die geometry and molecular weight characteristics

2018 ◽  
Vol 30 (5) ◽  
pp. 053103 ◽  
Author(s):  
Marzieh Ebrahimi ◽  
Tanja Tomkovic ◽  
Guochang Liu ◽  
Antonios A. Doufas ◽  
Savvas G. Hatzikiriakos
Keyword(s):  
Molecular Weight ◽  
Low Density ◽  
Melt Fracture ◽  
Die Geometry ◽  
Molecular Weight Characteristics

Partial repression of siderophore-mediated iron transport in Azotobacter vinelandii grown with mineral iron

1988 ◽  
Vol 34 (5) ◽  
pp. 675-679 ◽  
Author(s):  
William J. Page ◽  
Gregory A. Grant
Keyword(s):  
Molecular Weight ◽  
Outer Membrane ◽  
Iron Transport ◽  
Mineral Content ◽  
Azotobacter Vinelandii ◽  
Outer Membrane Proteins ◽  
Additional Component ◽  
Transport Activity ◽  
Fe Uptake ◽  
Mineral Concentrations

Azotobacter vinelandii grown in iron-limited medium containing increased amounts of the minerals olivine or glauconite produced decreased amounts of siderophores and iron-repressible outer membrane proteins. These minerals caused a relatively rapid repression of the pyoverdin-type siderophore, azotobactin, and a slower repression of the catechol siderophores, azotochelin and aminochelin. A 77 000 molecular weight outer membrane protein also was repressed with increased mineral content of the medium, but coordinate repression with any one siderophore was not evident. Cells grown with increased mineral concentrations progressively lost siderophore-mediated iron-transport activity. This loss in activity had the greatest effect on azotobactin-mediated 55Fe uptake, but catechol siderophore mediated 55Fe uptake also was depressed. These results suggested that an additional component was required for maximal iron-transport activity promoted by all the siderophores of A. vinelandii.

Stability of Plasmid pHV1431 in Free and Immobilized Cell Cultures. Effect of Temperature

1996 ◽  
Vol 782 (1) ◽  
pp. 311-322 ◽  
Author(s):  
MURIEL CRAYNEST ◽  
JEAN-NOËL BARBOTIN ◽  
NICOLE TRUFFAUT ◽  
DANIEL THOMAS
Keyword(s):  
Cell Cultures ◽  
Effect Of Temperature ◽  
Immobilized Cell
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