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Topic: Cellulose


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In the News (Thu 18 Jul 19)

  
  Cellulose - LoveToKnow 1911
The representative "cellulose" is the main constituent of the cotton fibre substance, and is obtainable by treating the raw fibre with boiling dilute alkalis, followed by chlorine gas or bromine water, or simply by alkaline oxidants.
Cellulose reacts directly with acetic anhydride to form low esters; in the presence of sulphuric acid the reaction proceeds to higher limits; the triacetate is soluble in chloroform.
The cellulose varies in amount from So to 50%, and the lignone varies inversely as the degree of lignification, that is, from the lignified bast fibre of annuals, of which jute is a type, to the dense tissues of the perennial dicotyledonous woods, typified by the beech.
www.1911encyclopedia.org /Cellulose   (3937 words)

  
 [No title]
As a carbohydrate, the chemistry of cellulose is primarily the chemistry of alcohols; and it forms many of the common derivatives of alcohols, such as esters, ethers, etc. These derivatives form the basis for much of the industrial technology of cellulose in use today.
Cellulose acetate is soluble in organic solvents such as acetone and can be spun into fiber or formed into other shapes.
Although cellulose is sufficiently stable toward hydrolysis to allow it to be dyed, finished and laundered, it is susceptible to hydrolysis by acids and, to a lesser extent, by alkalis.
www.fibersource.com /f-tutor/cellulose.htm   (1994 words)

  
 [No title]   (Site not responding. Last check: 2007-10-07)
Cellulose is the common material of plant cell walls and was first noted as such in 1838.
Cellulose is processed to make cellophane and rayon.
Given a cellulose material, the portion that does not dissolve in a 17.5% solution of sodium hydroxide at 20 deg C. is Alpha Cellulose, this is true cellulose; the portion that dissolves and then precipitates upon acidification is Beta Cellulose; and the proportion that dissolves but does not precipitate is called Gamma Cellulose.
wikiwhat.com /encyclopedia/c/ce/cellulose.html   (155 words)

  
 Cellulose
Cellulose has many uses as an anticake agent, emulsifier, stabilizer, dispersing agent, thickener, and gelling agent but these are generally subsidiary to its most important use of holding on to water.
Bacterial cells may be removed by hot alkali and the clean wet cellulose used as a substrate for immobilizing biomolecules [843] or for covering wounds [844].
About a third of the world's production of purified cellulose is used as the base material for a number of water-soluble derivatives with pre-designed and wide-ranging properties dependent on groups involved and the degree of derivatization (for an extensive review see [287]).
www.lsbu.ac.uk /water/hycel.html   (998 words)

  
 cellulose@Everything2.com
Interestingly, cellulose is an isomer of starch and glycogen but these two polymers differ from cellulose in that starch and glycogen have alpha 1,4 glycosidic bonds between glucose units.
Cellulose is synthesised at the extracellular surface of the plasma membrane by a membrane-bound enzyme complex called cellulose synthase which uses cytoplasmic UDP-glucose as its substrate.
The orientation of newly synthesised cellulose molecules is determined by a cortical-array of microtubules which in turn determines the direction of cell-expansion and thus the shape of the cell and, ultimately, the shape of the plant as a whole.
www.everything2.com /index.pl?node=cellulose   (684 words)

  
 ES&T Online News: Electricity from cellulose
Microbes taken from a cow’s rumen are able to power a microbial fuel cell by digesting cellulose, which is widely available as a potential fuel.
By using bacteria and fungi from the stomachs of cows, researchers from the Ohio State University have created one of the first microbial fuel cells (MFCs) to generate electricity by digesting cellulose, the primary constituent of plants.
The bacteria and fungi in rumen fluid are a key source of the cellulolytic enzymes that metabolize cellulose.
pubs.acs.org /subscribe/journals/esthag-w/2005/sep/tech/bb_electricity.html   (391 words)

  
 SUNY College of Environmental Science and Forestry - SUNY-ESF: Cellulose Makes Plastic 3,000 Times Stronger
Using cellulosic nanocrystals to strengthen plastics has advantages over the glass that is often used: Glass is heavier, harder on processing machinery and therefore more expensive to work with, and it stays in the ground for centuries.
In Winter’s process, the cellulose is first purified in the laboratory as substances such as wax and gluey lignin are removed from the biomass.
The cellulose is shredded into tiny particles under high pressure, rendering nanocrystals, so-called because they are so miniscule they are measured in nanometers, or billionths of a meter.
www.esf.edu /newspubs/news/2006/10.16.nanocrystals.htm   (683 words)

  
 Cellulose Acetate   (Site not responding. Last check: 2007-10-07)
At about the same time, Little in the US and Bronnert in Germany simultaneously produced cellulose acetate filaments, which were in actual fact cellulose triacetate, which differs in that it is does not easily dissolve on common solvents.
Another technique for producing cellulose acetate involved treating cotton with acetic acid, using sulfuric acid as a catalyst.
Cellulose acetate fibres are used for textiles and clothing by many of the top designers in the world.
www.azom.com /details.asp?ArticleID=1461   (401 words)

  
 [No title]
International Cellulose Corporation (ICC) is the world’s leading developer and manufacturer of cellulose spray-applied thermal insulation and acoustical finishes.
ICC has developed such high performance cellulose products such as K-13â, SonaSpray “fc”â and Celbarâ.
Our commitment to quality is reflected in our ISO 9002 certification and the follow up inspection programs of Underwriter’s Laboratories (UL) and Factory Mutual Research Corporation (FM).
www.spray-on.com   (222 words)

  
 Faculty Information - Wolfgang G. Glasser
Cellulose fiber composites with a thermoplastic cellulose ester matrix.
The synthesis of long-chain branched cellulose derivatives with increased polydispersity.
Oxidative purificaiton of cellulose from the steam explosion of woody biomass.
www.vtwood.forprod.vt.edu /contactlists/facultydetail.asp?facultyID=6   (6633 words)

  
 Film - Wikipedia, the free encyclopedia
Cellulose nitrate was the first type of film base used to record motion pictures, but due to its flammability was eventually replaced by safer materials.
Stock widths and the film format for images on the reel have had a rich history, though most large commercial films are still shot on (and distributed to theaters) as 35 mm prints.
Most movies on cellulose nitrate base have been copied onto modern safety films.
en.wikipedia.org /wiki/Film   (3739 words)

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