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Showing posts with label biochemistry. Show all posts
Before we touch chitosan, for the first I will give explanation about bioploymer.
Biopolymer consists of two words such as bio and polymer. The meaning of bio refer to organism/natural and the word of polymer have meaning the supramacromolecule that construct from a variant of monomer or combine of two or more monomer and it can have biggest weight of molecular. So, we can redefine biopolymer with the two words before, it have means naturally supramacromolecule (can be collect from organism/microorganism) that construct from a variant of monomer or combine of two or more monomer and it can have biggest weight of molecular.
Chitosan is the second most abundant natural polymer and has many useful applications in the area of biomedical engineering, including gene delivery, due to its cationic character at physiological conditions. Chitosan shows limited solubility at neutral pH, and forms polyelectrolyte complexes with polyanions, often resulting in precipitation. Chitosan also has been used as a support for enzyme immobilization (Klein et al., 2012; Kuo et al., 2012; Li, Cai, Zhong, & Du, 2012; Muzzarelli, 1980; Orrego et al., 2010). Chitosan, isolated from chitin, is the linear and partly acetylated (1–4)-2-amino-2-deoxy--d-glucan (Muzzarelli, 1977, 2012; Muzzarelli et al., 2012). Chitosan is a cationic natural copolymer of glucosamine and biodegradable mucoadhesive polysaccharide derived from crustacean shells. Chitosan particles have been shown to increase transcellular and paracellular transport of macromolecules across the intestinal epithelial monolayer andused successfully todeliver adrugorally toenterocytes, Peyer’s patches and mesenteric lymph nodes (Desai et al., 1996; vanderLubbenet al., 2001;Ouji et al., 2002). Chitosan has been used widely for the production of biodegradable and biocompatible micro- and nanoparticles.
What is on your mind about Recombinant DNA technology?
Have it on yours?
If the answer "Not" may these video and flash file could help you to create definition about Recombinant DNA technology, which I took by google search engine.
Or
To play this flash object, right click on it and choose play (only if there is no mark sign on play)
And after you watch the two video above, have it on yours?
I will define the it to you, recombinant DNA technology is a technology that allows DNA to be produced via artificial means.
This technology works by taking DNA from two different sources and combining it into a single molecule. There are two main types of cloning that recombinant DNA technology is used for therapeutic cloning and reproductive cloning. Using recombinant DNA technology for therapeutic cloning purposes holds a great deal of potential benefit. For example, a cancerous organ could be replaced with a new one made from a patient's own DNA.
The define and advantages of recombinant DNA technology above are taken from http://www.wisegeek.org
And how about the disadvantages of recombinant DNA technology? The simple answer are it can remove the natural plasma nutfah, cause by the growth of technology of recombinant DNA, human naturally wanna to create the new organism/microorganism that have more advantages or that no have disadvantages.
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