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Fructose is not an amino acid; rather, it is classified as a simple sugar, also known as a monosaccharide. Amino acids are organic compounds that serve as the building blocks for proteins and play a crucial role in various bodily functions. They contain amino (-NH2) and carboxyl (-COOH) functional groups, along with a side chain specific to each amino acid. In contrast, fructose has a molecular structure that is characteristic of sugars, containing multiple hydroxyl (-OH) groups and a carbonyl group (-C=O) but not the functional groups specific to amino acids. Fructose is mainly found in fruits and honey and is used by the body as a source of energy, especially in the liver where it is metabolized. The confusion between fructose and amino acids may arise from the fact that both are fundamental components of biological systems but their functions and structures are quite distinct.
Iron oxide is not only MRI compatible but actually used in MRI studies as a contrast agent. Nanoparticles of iron oxide enhance the contrast in magnetic resonance imaging by affecting the relaxation times of nearby hydrogen atoms, making certain tissues or abnormalities more or less visible. This is particularly useful in medical diagnostics for clearer, more detailed images of the body's internal structures. However, the use of iron oxide in MRI requires careful preparation and dosage to ensure safety and effectiveness, as with any contrast agent. Thus, while inherently MRI compatible, the application of iron oxide must be judiciously managed.
Carboxymethyl cellulose (CMC) is a chemically modified derivative of cellulose, the most abundant polymer on earth. This white, odorous powder is water-soluble, making it highly valuable in numerous industrial applications. Its uses range from a thickening agent in food and cosmetic products to a stabilizer in pharmaceuticals. The process of carboxymethylation involves introducing carboxymethyl groups (-CH2-COOH) into the cellulose chain, enhancing its water solubility and altering its physical properties. This modification allows CMC to serve as a versatile additive, providing viscosity, texture, and moisture retention to various products. Additionally, its non-toxic nature makes it suitable for contact with food and beverages. Environmental sustainability concerns regarding cellulose extraction and processing are noteworthy, but CMC's biodegradability and efficiency in usage present a relatively lower environmental footprint compared to synthetic polymers.
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