adjective (often lowercase)
(of bacteria) retaining the violet dye when stained by Gram's method.
Negative Or Positive Reinforcement: Which Is Better?Negative reinforcement vs. positive reinforcement Most people think that positive reinforcement means to lavish praise or encouragement, and that is a good part of its essence, but not all of it. What is negative reinforcement, then? Is that about withholding praise? Scolding? Admonishing? Positive reinforcement is actually something we’re all pretty familiar with. When you were a kid, did you get a weekly allowance for …
Is English an innately positive language? Scientists say yes.Mathematicians at the University of Vermont have been meddling in a field very far from boring numbers. Earlier this month, they officially declared the English language “optimistic” based on a careful analysis that combined statistics and subtle human evaluation. The researchers, led by assistant professor Chris Danforth, aggregated texts from Twitter, the New York Times, song lyrics, and Google Books’ database dating back to 1520. …
Origin of Gram-positive
First recorded in 1905–10; see origin at Gram's method
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for gram-positive
A Gram-positive stool due to cocci is suggestive of intestinal ulceration.A Manual of Clinical Diagnosis|James Campbell Todd
This method is excellent for differentiating Gram-positive and Gram-negative organisms on the same slide.
The Gram-positive bacteria are violet and the Gram-negative are red.
designating bacteria that retain the violet stain in Gram's method
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Of, relating to, or being a bacterium that retains the violet stain used in Gram's method.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Relating to a group of bacteria that turn a dark-blue color when subjected to a laboratory staining method known as Gram's method. Gram-positive bacteria have relatively thick cell walls and are generally sensitive to the destructive effects of antibiotics or the actions of the body's immune cells. Gram-positive bacteria include beneficial nitrogen-fixing bacteria in soil, as well as the bacteria that cause anthrax, botulism, leprosy, tuberculosis, scarlet fever, and strep throat. Compare gram-negative.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.