Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Input: One of these substances is used in an analytical technique whose tris-glycine buffer system was developed by Ulrich Laemmli, which can be followed by the addition of Coomassie dyes. These substances, as wetting agents, encourage flocculation, and the aforementioned example of these substances is used to denature proteins. Below the Krafft temperature, they form micelles, and cleaning agents that deal better with grease and hard water than soap can employ these substances, one of which is SDS. A major type of emulsifier, these substances possess hydrophobic tails and hydrophilic heads. For 10 points, name these substances that reduce the surface tension of liquids.
Output:
Science