Glycolysis, Gluconeogenesis and Glycogen and Cellulose Synthesis

2014 ◽  
pp. 73-83
Author(s):  
G. N. Cohen
Keyword(s):  
Cellulose Synthesis

Single molecule optical diffraction: A tool for understanding the structure of triple stranded left-hand helical cellulose

1989 ◽  
Vol 47 ◽  
pp. 1024-1025
Author(s):  
George C. Ruben ◽  
William Krakow
Keyword(s):  
Single Molecule ◽  
Helical Structure ◽  
Optical Diffraction ◽  
Maximum Diameter ◽  
Primary Cell Wall ◽  
Cellulose Synthesis ◽  
Left Hand ◽  
Left Handed ◽  
Freeze Dried ◽  
Diffraction Patterns

Tobacco primary cell wall and normal bacterial Acetobacter xylinum cellulose formation produced a 36.8±3Å triple-stranded left-hand helical microfibril in freeze-dried Pt-C replicas and in negatively stained preparations for TEM. As three submicrofibril strands exit the wall of Axylinum , they twist together to form a left-hand helical microfibril. This process is driven by the left-hand helical structure of the submicrofibril and by cellulose synthesis. That is, as the submicrofibril is elongating at the wall, it is also being left-hand twisted and twisted together with two other submicrofibrils. The submicrofibril appears to have the dimensions of a nine (l-4)-ß-D-glucan parallel chain crystalline unit whose long, 23Å, and short, 19Å, diagonals form major and minor left-handed axial surface ridges every 36Å.The computer generated optical diffraction of this model and its corresponding image have been compared. The submicrofibril model was used to construct a microfibril model. This model and corresponding microfibril images have also been optically diffracted and comparedIn this paper we compare two less complex microfibril models. The first model (Fig. 1a) is constructed with cylindrical submicrofibrils. The second model (Fig. 2a) is also constructed with three submicrofibrils but with a single 23 Å diagonal, projecting from a rounded cross section and left-hand helically twisted, with a 36Å repeat, similar to the original model (45°±10° crossover angle). The submicrofibrils cross the microfibril axis at roughly a 45°±10° angle, the same crossover angle observed in microflbril TEM images. These models were constructed so that the maximum diameter of the submicrofibrils was 23Å and the overall microfibril diameters were similar to Pt-C coated image diameters of ∼50Å and not the actual diameter of 36.5Å. The methods for computing optical diffraction patterns have been published before.

Structural aspects of tracheary element differentiation in suspension cultures of Zinnia elegans

1989 ◽  
Vol 47 ◽  
pp. 768-769
Author(s):  
C. H. Haigler ◽  
A. W. Roberts
Keyword(s):  
Tracheary Element ◽  
Vesicle Fusion ◽  
Zinnia Elegans ◽  
Cellulose Synthesis ◽  
Tracheary Elements ◽  
Animal Cells ◽  
Mesophyll Cells ◽  
Fixation Techniques ◽  
Localized Patterns ◽  
Structural Aspects

Tracheary elements, the water-conducting cells in plants, are characterized by their reinforced walls that became thickened in localized patterns during differentiation (Fig. 1). The synthesis of this localized wall involves abundant secretion of Golgi vesicles that export preformed matrix polysaccharides and putative proteins involved in cellulose synthesis. Since the cells are not growing, some kind of endocytotic process must also occur. Many researchers have commented on where exocytosis occurs in relation to the thickenings (for example, see), but they based their interpretations on chemical fixation techniques that are not likely to provide reliable information about rapid processes such as vesicle fusion. We have used rapid freezing to more accurately assess patterns of vesicle fusion in tracheary elements. We have also determined the localization of calcium, which is known to regulate vesicle fusion in plant and animal cells.Mesophyll cells were obtained from immature first leaves of Zinnia elegans var. Envy (Park Seed Co., Greenwood, S.C.) and cultured as described previously with the following exceptions: (a) concentration of benzylaminopurine in the culture medium was reduced to 0.2 mg/l and myoinositol was eliminated; and (b) 1.75ml cultures were incubated in 22 x 90mm shell vials with 112rpm rotary shaking. Cells that were actively involved in differentiation were harvested and frozen in solidifying Freon as described previously. Fractures occurred preferentially at the cell/planchet interface, which allowed us to find some excellently-preserved cells in the replicas. Other differentiating cells were incubated for 20-30 min in 10(μM CTC (Sigma), an antibiotic that fluoresces in the presence of membrane-sequestered calcium. They were observed in an Olympus BH-2 microscope equipped for epi-fluorescence (violet filter package and additional Zeiss KP560 barrier filter to block chlorophyll autofluorescence).

Textile waste as precursors in nanocrystalline cellulose synthesis

Cellulose ◽  
2021 ◽  
Author(s):  
Andrielen Braz Vanzetto ◽  
Lilian Vanessa Rossa Beltrami ◽  
Ademir José Zattera
Keyword(s):  
Nanocrystalline Cellulose ◽  
Cellulose Synthesis ◽  
Textile Waste

scholarly journals Carboxymethyl cellulose synthesis from durian seed flour: The effect of sodium chloroacetate variation

2021 ◽  
Vol 1122 (1) ◽  
pp. 012094
Author(s):  
MHS Ginting ◽  
A Utama ◽  
H Muhammad ◽  
Maulida ◽  
R Tambun
Keyword(s):  
Carboxymethyl Cellulose ◽  
Cellulose Synthesis ◽  
Seed Flour ◽  
Durian Seed

Intermediates of Cellulose Synthesis in Acetobacter

1982 ◽  
pp. 341-361 ◽  
Author(s):  
Yehoshua Aloni ◽  
Moshe Benziman
Keyword(s):  
Cellulose Synthesis

scholarly journals Cellulose-Microtubule Uncoupling Proteins Prevent Lateral Displacement of Microtubules during Cellulose Synthesis in Arabidopsis

2016 ◽  
Vol 38 (3) ◽  
pp. 305-315 ◽  
Author(s):  
Zengyu Liu ◽  
Rene Schneider ◽  
Christopher Kesten ◽  
Yi Zhang ◽  
Marc Somssich ◽  
...  
Keyword(s):  
Lateral Displacement ◽  
Uncoupling Proteins ◽  
Cellulose Synthesis

scholarly journals Effect of Gluconacetobacter xylinus cultivation conditions on the selected properties of bacterial cellulose

2016 ◽  
Vol 18 (4) ◽  
pp. 117-123 ◽  
Author(s):  
Karol Fijałkowski ◽  
Anna Żywicka ◽  
Radosław Drozd ◽  
Marian Kordas ◽  
Rafał Rakoczy
Keyword(s):  
Bacterial Cellulose ◽  
Bacterial Strain ◽  
Point Of View ◽  
Synthesis Process ◽  
Cellulose Synthesis ◽  
Gluconacetobacter Xylinus ◽  
Water Release ◽  
Good Efficiency ◽  
Cellulose Fibrils ◽  
Culturing Conditions

Abstract The aim of the study was to analyze the changes in the parameters of bacterial cultures and bacterial cellulose (BC) synthesized by four reference strains of Gluconacetobacter xylinus during 31-day cultivation in stationary conditions. The study showed that the most visible changes in the analyzed parameters of BC, regardless of the bacterial strain used for their synthesis, were observed in the first 10–14 days of the experiment. It was also revealed, that among parameters showing dependence associated with the particular bacterial strain were the rate and period of BC synthesis, the growth rate of bacteria anchored to the cellulose fibrils, the capacity to absorb water and the water release rate. The results presented in this work may be useful in the selection of optimum culturing conditions and period from the point of view of good efficiency of the cellulose synthesis process.

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