Indicator An event, entity or condition that typically characterises a prescribed environment or situation, indicators determine or aid in determining whether or not certain stated circumstances exist or criteria are satisfied. Before using our website, please read our Privacy Policy. Only $1/month. Learn indicators biology with free interactive flashcards. While this could be facilitate… Chapter 55 of the USP is titled “Biological Indicators – Resistance Performance Tests”. tor (ĭn′dĭ-kā′tər) n. 1. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution. An organism that can be used to determine the concentration of a chemical in the environment. Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. Multi Variable Indicators and Integrators, Mesa Releases a New 24-hour Biological Indicator for the Sterrad® Sterilization Process, Mesa’s Complete Biological Indicator Offering. Indicators in this definition are components, specified as organisms, substances or objects. portalId: '2114285', Within the introduction, a definition of biological indicators is provided:  “A biological indicator (BI) is a well-characterized preparation of a specific microorganism with a known resistance to a specific sterilization process.”  To expand on this definition, a BI is essentially a microbiological test system. They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in their absorption spectra. 2. Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. They have the property of dissociating in solution to yield ions of different colours from the un-dissociated molecules. Indicator species, organism—often a microorganism or a plant—that serves as a measure of the environmental conditions that exist in a given locale. biological indicator: any organism which can be used to characterize particular environmental properties, e.g. Match. Endangered species are those that face the risk of extinction. Gamasina are caught alive either with dynamic extraction or in the field with a fine brush. The most common indicator used in the laboratory is the litmus. This could be an animal (like the owl), a … Using BCECF-dextran as a pH indicator, it was possible to measure a pH gradient over depth within the inner EPF of Arctica islandica between the shell and the OME of the animal. Start studying Lab Quiz- Indicators Biology HL. Favorite Answer. Because the spores used in BIs are the most resistant spores to a particular sterilization process, a BI that does not grow out indicates that other potential spores or bacteria in the sterilization load have been killed. Create. Flashcards. Self-contained biological indicator intended for use in the monitoring of saturated steam, ethylene oxide, and hydrogen peroxide sterilization. These are called acid-base indicators. Natural Indicator is a type of indicator that can be found naturally and can determine whether the substance is an acidic substance or a basic substance. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Choose from 256 different sets of indicators biology flashcards on Quizlet. It is not intended to provide medical, legal, or any other professional advice. For example, greasewood indicates saline soil; mosses often indicate acid soil. It could also contain up to two different species, without having detrimental effect on the performance of the biological indicator. Tubifex worms indicate oxygen-poor and stagnant water unfit to drink. All Rights Reserved. Views expressed here do not necessarily reflect those of Biology Online, its staff, or its partners. Within the introduction, a definition of biological indicators is provided: “A biological indicator (BI) is a well-characterized preparation of a specific microorganism with a known resistance to a specific sterilization process.” To expand on this definition, a BI … Smart-Read EZTest® Self-contained color change biological indicator specifically designed for rapid evaluation in the Smart-Well incubator. Talk with one of our experts to get your questions answered and see how we can help you solve your BI pain points. One that indicates, especially: a. Moreover, indicators can be simple or complex. They are called indicator species. Lab Quiz- Indicators Biology HL . Define acid-base indicator. 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