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Most aerotolerant anaerobes have superoxide dismutase and (non-catalase) peroxidase but do not have catalase. [1] More specifically, they may use a NADH oxidase/NADH peroxidase (NOX/NPR) system or a glutathione peroxidase system. [2] An example of an aerotolerant anaerobe is Cutibacterium acnes. [3]
As oxystat bioreactors are expensive to buy and run, lower-cost solutions have been devised. For example, the Micro-Oxygenated Culture Device (MOCD) is a system involving ordinary flasks, oxygen-permeable tubes, sensors, and water pumps. Aeration is done by pumping the culture medium through the tubes. [1]
Streptococcus pyogenes is a species of Gram-positive, aerotolerant bacteria in the genus Streptococcus.These bacteria are extracellular, and made up of non-motile and non-sporing cocci (round cells) that tend to link in chains.
Aerotolerant anaerobes do not use oxygen but are not harmed by it. [6] When an organism is able to survive in both oxygen and anaerobic environments, the use of the Pasteur effect can distinguish between facultative anaerobes and aerotolerant organisms. If the organism is using fermentation in an anaerobic environment, the addition of oxygen ...
This example is the first time that hydrogen production has been seen in an obligate aerobe. [8] It also confirms the fermentation in a mycobacterium and is evidence that hydrogen plays a role in survival as well as growth. [8] Problems can also arise in oxygen-rich environments, most commonly attributed to oxidative stress.
Aerobic and anaerobic bacteria can be identified by growing them in test tubes of thioglycolate broth: 1: Obligate aerobes need oxygen because they cannot ferment or respire anaerobically. They gather at the top of the tube where the oxygen concentration is highest.
Lactiplantibacillus plantarum are homofermentative, aerotolerant Gram-positive bacteria that grow at 15 °C (59 °F), but not at 45 °C (113 °F), and produce both isomers of lactic acid . Many lactobacilli including L. plantarum are unusual in that they can respire oxygen and express cytochromes if heme and menaquinone are present in the ...
Enterococcus is a large genus of lactic acid bacteria of the phylum Bacillota. Enterococci are Gram-positive cocci that often occur in pairs ( diplococci ) or short chains, and are difficult to distinguish from streptococci on physical characteristics alone. [ 2 ]