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2. Universal indicator - Wikipedia

   en.wikipedia.org/wiki/Universal_indicator

   The strip can be placed directly onto a surface of a wet substance or a few drops of the solution can be dropped onto the universal indicator using dropping equipment. If the test solution is of a dark colour, it is preferable to use a paper universal indicator, such as Hydrion paper .

3. Test strip - Wikipedia

   en.wikipedia.org/wiki/Test_strip

   A test strip is a band/piece/strip of paper or other material used for biological testing. Specifically, test strip may refer to: Food testing strips; Glucose meter test strip; Lipolysis test strip; Urine test strip; Universal indicator pH test strips; It may also refer to: Teststrip, an art gallery in Auckland, New Zealand

4. Analytical profile index - Wikipedia

   en.wikipedia.org/wiki/Analytical_profile_index

   Test Strips: The system consists of a plastic strip containing 20 small reaction tubes (microtubes), each containing different dehydrated substrates. Rehydration and Inoculation: To perform the test, the microtubes are rehydrated with a bacterial suspension. Each microtube is designed to detect specific enzymatic activities or carbohydrate ...

5. pH indicator - Wikipedia

   en.wikipedia.org/wiki/PH_indicator

   pH indicators: a graphic view. A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. [1]

6. Where could it snow this weekend? Track winter weather across US

   www.aol.com/where-could-snow-weekend-track...

   Winter weather continues to ramp up this month with snow set to fall in the northern Rocky Mountains and the far northern Plains this weekend.. Arctic air from Canada is bringing wintry conditions ...

7. What is St. Nicholas Day? How the German and Dutch holiday ...

   www.aol.com/st-nicholas-day-german-dutch...

   There are less than 20 days until Christmas but for some Americans, holiday celebrations commence even sooner. While it's not celebrated nationwide, St. Nicholas Day holds a special place for ...