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  2. Bromothymol blue - Wikipedia

    en.wikipedia.org/wiki/Bromothymol_blue

    Different colors of bromothymol blue at marked pH conditions. Bromothymol blue may be used for observing photosynthetic activities, or as a respiratory indicator (turns yellow as CO 2 is added). [7] [8] A common demonstration of BTB's pH indicator properties involves exhaling through a tube into a neutral solution of BTB.

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  4. pH indicator - Wikipedia

    en.wikipedia.org/wiki/PH_indicator

    The observed spectrum (green) is the sum of the spectra of HA (gold) and of A − (blue), weighted for the concentration of the two species. When a single indicator is used, this method is limited to measurements in the pH range p K a ± 1, but this range can be extended by using mixtures of two or more indicators.

  5. Bromophenol blue - Wikipedia

    en.wikipedia.org/wiki/Bromophenol_blue

    Bromophenol is also used as a colour marker to monitor the process of agarose gel electrophoresis and polyacrylamide gel electrophoresis.Since bromophenol blue carries a slight negative charge at moderate pH, it will migrate in the same direction as DNA or protein in a gel; the rate at which it migrates varies according to gel density and buffer composition, but in a typical 1% agarose gel in ...

  6. The 7 Best Cheap Stocks to Buy That Are Under $20 Now - AOL

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    Thanks to the overwhelming popularity of meme trades along with the dramatic speculation in the major indices, you might assume that it’s difficult to find viable cheap stocks to buy under $20.

  7. 7 Blue-Chip Stocks That Are Too Cheap to Ignore - AOL

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    The 2022 stock market downturn has created the opportunity to enter long-term positions in various stocks at bargain prices. After looking at the best cheap micro-cap and mid-cap stocks out there ...

  8. Talk:Bromothymol blue - Wikipedia

    en.wikipedia.org/wiki/Talk:Bromothymol_blue

    The Sigma-Aldrich catalog lists the pKa value of 7.10 as approximate. (The quoted description from the online catalog is: Bromothymol Blue (BTB) is a pH indicator (pKa approx. 7.1) that is used as a biological slide vital stain to define cell walls or nuclei under the microscope.

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