Dictionary » O » Oxygen




(chemistry) A colorless, tasteless, oderless, gaseous element that abounds in the atmosphere.


In chemistry, oxygen is an element with an atomic weight of 15.96. It is capable of combining with all elements, with the exception of fluorine, to form oxides, bases, oxyacid anhydrides, etc. At room temperature, oxygen is only moderately active with most substances. However, at higher temperatures, it becomes very active that it is considered as one of the most powerful chemical agents.

In biology, the oxygen plays a crucial role in various biochemical and physiological processes, such as in cellular respiration. Its presence makes cellular respiration about ten times more efficient in yielding ATP.

Oxygen is also thought to have a therapeutic role especially to treating or managing ischemic tissues.

Word origin: F. Oxygene, from Gr. Sharp, acid _ root of to be born; named by Lavoisier as he supposed it to be a constituent of al 1000 l acids
Related forms: oxygenic (adjective)

Symbol: O

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reproductive sytem

... all body systems, is interlinked. The first part of the questions might throw you off a bit. Start by thinking big. Everything in the body needs oxygen and a blood supply, both of which link to the circulatory and respiratory systems. Whilst parts are autonomous the vast majority requires messages ...

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by Babybel56
Fri Feb 28, 2014 8:49 am
Forum: Molecular Biology
Topic: reproductive sytem
Replies: 1
Views: 126

The effect of ethanol on peroxidase activity

Hi! I'm wondering if anyone knew why by increasing ethanol concentration in a 10mL solution mixed with yeast, a greater amount of oxygen was produced? So peroxidase activity increased when i increased ethanol concentration in my lab. I thought it was suppose to be the opposite since alcohol ...

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by wayne2824
Fri Feb 14, 2014 10:44 pm
Forum: General Discussion
Topic: The effect of ethanol on peroxidase activity
Replies: 1
Views: 214


... to stop it. But it's an exam question,so they probably want to know, whether you know that TCA runs aerobically only, althoughit doesn't require oxygen per se. Thus it's 200 ATPs from glycolysis (2 per 1 Glc) and could be additional 200 from TCA (1 per 1 acetyl-CoA). The TCA or Krebs cycle only ...

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by caters
Mon Feb 03, 2014 4:37 am
Forum: Cell Biology
Topic: ATP produced by human cells in an anaerobic chamber. LOST!
Replies: 2
Views: 1657

Re: drink water, orange juice or Cola before eating?

... in the less-digested form and also the CO2. As most people know, CO2 is a waste product which the lungs expel in exchange for the much-needed oxygen supply into our body and ultimately, our cells. This helps keep our blood gases balanced, and the premature emptying of CO2 in this manner causes ...

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by MamaWrites
Sat Nov 30, 2013 8:40 pm
Forum: Physiology
Topic: drink water, orange juice or Cola before eating?
Replies: 15
Views: 32087

some bloody questions

The most critical metabolite supplied to cells by the blood is oxygen . Ischaemia is the term used to describe the condition when the blood supply is insufficient to meet the metabolic demands of a tissue. In response the body can compensate by releasing ...

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by zak
Mon Nov 25, 2013 8:09 pm
Forum: Human Biology
Topic: some bloody questions
Replies: 4
Views: 2047
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