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The US Food and Drug Administration (FDA) defines soft contact lenses as: made of soft, flexible plastics that allow oxygen to pass through to the cornea. Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your ...
Biuret test. In chemistry, the biuret test (IPA: / ˌbaɪjəˈrɛt /, / ˈbaɪjəˌrɛt / [ 1] ), also known as Piotrowski's test, is a chemical test used for detecting the presence of at least two peptide bonds in a molecule. In the presence of peptides, a copper (II) ion forms mauve -colored coordination complexes in an alkaline solution.
Biuret ( / ˈbjurɛt / BYUR-ret) is a chemical compound with the chemical formula HN (CONH2)2. It is a white solid that is soluble in hot water. A variety of organic derivatives are known. The term "biuret" also describes a family of organic compounds with the chemical formula R1R2N−C (=O)−N (R3)−C (=O)−NR4R5, where R1, R2, R3, R4 and ...
A buffer solution is a solution where the pH does not change significantly on dilution or if an acid or base is added at constant temperature. [1] Its pH changes very little when a small amount of strong acid or base is added to it. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical ...
Burow's solution is an aqueous solution of aluminium triacetate. It is available in the U.S. as an over-the-counter drug for topical administration, with brand names including Domeboro (Moberg Pharma), Domeboro Otic (ear drops), Star-Otic, and Borofair. [ 1] The preparation has astringent and antibacterial properties and may be used to treat a ...
Polyaminopropyl biguanide ( PAPB) is a polymer containing biguanide group connected with a three methylene (propyl) linker. The polymer is a propyl analogue of polyhexamethylene biguanide. The polymer display some antibacterial activity however much lower than PHMB. [ 1] As of May 2024, PAPB is not approved as a biocidal active substance under ...
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