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ammonia

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air

Overview page. Subjects: Meteorology and Climatology — Environmental Science.

1 A mixture of gases that makes up the Earth's atmosphere. It comprises about 78% nitrogen, 21% oxygen, less than 1% of carbon dioxide and other gases, and varying amounts of...

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amine

Overview page. Subjects: Biological Sciences.

Any one of a group of organic compounds derived by replacing one or more of the hydrogen atoms in ammonia by organic groups. Primary amines have one hydrogen replaced, e.g. methylamine, CH3null...

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ammonification

Overview page. Subjects: Environmental Science.

The biochemical process in which ammonia is produced by micro‐organisms through the decomposition of organic matter.

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ammonium

Overview page. Subjects: Chemistry.

An ion derived from ammonia; the primary form in which nitrogen is applied in fertilizers.

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ammonotelic

Overview page. Subjects: Biological Sciences.

Describing animals that excrete nitrogenous waste in the form of ammonia. Most aquatic animals are ammonotelic. Compare ureotelic; uricotelic.

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catalyst

Overview page. Subjects: Chemistry — Medicine and Health.

n. a substance that alters the rate of a chemical reaction but is itself unchanged at the end of the reaction. The catalysts of biochemical reactions are the enzymes.

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chemosynthesis

Overview page. Subjects: Science and Mathematics.

The pathway by which bacteria in hydrothermal vent communities synthesize complex organic molecules from hydrogen sulphide gas and dissolved carbon dioxide: 4H2S + CO2 + O2 → HCHO + 4S + 3H2null...

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fix

Overview page. Subjects: Chemistry.

To convert carbon dioxide to carbohydrate (carbon fixation), or nitrogen dioxide to ammonia (nitrogen fixation).

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Haber process

Overview page. Subjects: Chemistry.

An industrial process for producing ammonia by reaction of nitrogen with hydrogen:N2+3H2 ⇌ 2NH3 The reaction is reversible and exothermic, so that a high yield of ammonia is favoured by low...

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hydrogen

Overview page. Subjects: Chemistry.

The most abundant of the biologically important elements. Atomic number 1; atomic weight 1.00797; valence 1+, most abundant isotope 1H, heavy isotope 2H (deuterium); radioisotope 3H...

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