WebCongo red shows red-orange deposits under nonpolarized light; apple-green birefringence under polarized light required for specificity. –. Nonspecific red staining by Congo red can be seen with collagen, fibrin, or other protein deposits; collagen can be refractile but not usually green ± Congo red. –. In contrast to fibrillar collagen ... WebPhenol red exists as a red crystal that is stable in air. … A solution of phenol red is used as a pH indicator, often in cell culture. Its color exhibits a gradual transition from yellow ( max = 443 nm) to red ( max = 570 nm) over the pH range 6.8 to 8.2. Above pH 8.2, phenol red turns a bright pink (fuchsia) color.

Methyl red - Wikipedia

WebNov 5, 2024 · Key components of the MacConkey medium include crystal violet dye, bile salts, lactose, and neutral red (pH indicator). Crystal violet dye and bile salts prevent the growth of Gram-positive bacteria and … rbs brodick branch

17.3: Acid-Base Indicators - Chemistry LibreTexts

http://www.atmo.arizona.edu/students/courselinks/fall12/atmo170a1s1/lecture_notes/SO2/pH%20indicator%20solutions.html WebF. Lestari, ... A.R. Green, in Fire Toxicity, 2010 NRU assay. The NRU assay is a cell viability chemosensitivity assay, based on the ability of viable cells to bind a Neutral Red dye. The neutral red (3-amino-7-dimethyl-amino-2-methylphenazine hydrochloride) is a weak cationic dye that readily penetrates cell membranes by non-ionic diffusion. 76 In intact cells, it … WebA suitable indicator for this strong acid - strong base titration would be bromothymol blue (pH range 6.2 - 7.6) or phenol red (pH range 6.8 - 8.4). Choosing an Appropriate Indicator for a Weak Acid - Strong Base Titration. An aqueous solution of acetic acid (ethanoic acid), CH 3 COOH(aq), is a weak acid. rbs branch manchester