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RPMI (Roswell Park Memorial institute) formula is red in color because a pH indicator, phenol red, is usually added to it. When living animal cells are grown in RPMI formula, they release metabolic waste products that change the pH toward acid (sort of like peeing in a swimming pool). As the acid wastes build up, the color fades from red to pink, and can even turn straw yellow with a lot of waste product contamination. The phenol red color changes indicate when the medium needs to be changed, which can differ according to the needs of the project. Maybe at the pink pH stage, or at the yellow pH stage, for example. This avoids having to keep testing the contents of the test tube or flask to determine how the pH is changing. Too much acid, and the cells will do poorly, or even die. The 'old' medium is decanted and fresh medium is poured in, if the cells need to keep growing in the same test tube or flask.
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When blood cells have oxygen they are red, when they have no oxygen they are a darker shade of red.
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It is bright red in color .
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1640/5280 mile
What is 1640 rounded to the nearest tens?
1640
What percent of 7800 is 1640?
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$1640 is £1351.50
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Nothing happened to me in 1640, because I was not born then.
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164000%1640 * 100% = 164000%
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Red wine can differ greatly in color, from a purplish red to a blood-red to even a brownish color. The color of a beet is very slightly purple, but mostly a dark red. This is similar to the common conception of the color of red wine. Therefore, you could say that beet red is similar to a red wine color.
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if you mean what color do you mix together to get red, you can't. Red is a primary color.
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red is her favorite color red is her favorite color
