Absolute alcohol is indicated as a primary fixative if the tissue is to be processed for the demonstration of which substance?

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Multiple Choice

Absolute alcohol is indicated as a primary fixative if the tissue is to be processed for the demonstration of which substance?

Explanation:
Some substances are best demonstrated when the tissue is fixed with a non-aqueous fixative because water-containing fixatives can dissolve or alter them. Absolute alcohol dehydrates and precipitates components without dissolving certain crystal structures, so urate crystals remain intact and visible after alcohol fixation. This preservation makes it easier to demonstrate urate crystals in tissues, especially under polarized light or with crystal-specific stains. In contrast, lipids are typically dissolved by alcohol, and nuclear or general protein details are better preserved with aqueous cross-linking fixatives, so those substances aren’t best demonstrated with absolute alcohol.

Some substances are best demonstrated when the tissue is fixed with a non-aqueous fixative because water-containing fixatives can dissolve or alter them. Absolute alcohol dehydrates and precipitates components without dissolving certain crystal structures, so urate crystals remain intact and visible after alcohol fixation. This preservation makes it easier to demonstrate urate crystals in tissues, especially under polarized light or with crystal-specific stains. In contrast, lipids are typically dissolved by alcohol, and nuclear or general protein details are better preserved with aqueous cross-linking fixatives, so those substances aren’t best demonstrated with absolute alcohol.

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