For best results when using formalin as a routine fixative, it must be made what?

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Multiple Choice

For best results when using formalin as a routine fixative, it must be made what?

Explanation:
Controlling pH is crucial because the cross-linking action of formaldehyde on tissue proteins works best at a near-neutral pH. Neutral buffered formalin uses a phosphate buffer to hold the pH around 7, preventing acidification as the fixative ages. This stability yields consistent fixation, preserves morphology well, and maintains nuclear detail for reliable staining. Acidic fixatives tend to cause artifacts and poor preservation, while alkaline fixatives can alter fixation dynamics and introduce other problems, so neutral is the preferred choice.

Controlling pH is crucial because the cross-linking action of formaldehyde on tissue proteins works best at a near-neutral pH. Neutral buffered formalin uses a phosphate buffer to hold the pH around 7, preventing acidification as the fixative ages. This stability yields consistent fixation, preserves morphology well, and maintains nuclear detail for reliable staining. Acidic fixatives tend to cause artifacts and poor preservation, while alkaline fixatives can alter fixation dynamics and introduce other problems, so neutral is the preferred choice.

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