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aboral

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

Away from the mouth; on the opposite side of the body from the mouth in animals that lack clear-cut dorsal and ventral surfaces.

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Abundance and potential metabolic activity of methanogens in well-aerated forest and grassland soils of an alpine region

Katrin Hofmann, Nadine Praeg, Mira Mutschlechner, Andreas O. Wagner and Paul Illmer.

Edited by Cindy Nakatsu.

in FEMS Microbiology Ecology

February 2016; p ublished online December 2015 .

Journal Article. Subjects: Soil Science; Biotechnology; Genetics and Genomics; Microbiology; Molecular and Cell Biology. 6991 words.

Graphical Abstract Figure.

Various methanogenic guilds were found to be present in aerated forest and grassland soils located at the montane and subalpine belts of the European Alps.

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abyssal

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

Applied to the deepest part of the ocean, below about 2000 m. The abyssal zone covers approximately 75% of the ocean floor. Compare bathyal; neritic.

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Acanthodii

Overview page. Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.

Class of primitive, fossil fish that had a true bony skeleton, a heterocercal tail fin, a persistent notochord, ganoid scales, and stout spines in front of the fins. The acanthodians lived...

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acid soil

Overview page. Subjects: Biological Sciences — Earth Sciences and Geography.

Soil with a pH under 7, such as podzols and brown earths. Acidity in a soil may be due to the leaching out of cations when precipitation exceeds evapotranspiration. Other factors include...

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acidophile

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

An extremophile (domain Archaea) that thrives in environments where the pH is below 5.0.

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acme zone

Overview page. Subjects: Earth Sciences and Geography — Ecology and Conservation.

Informally, a body of strata that contains the maximum abundance of a particular fossil taxon occurring within the stratigraphic range of that taxon, and after which the zone is named.

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Acrisols

Overview page. Subjects: Biological Sciences — Earth Sciences and Geography.

A reference soil group in the soil classification scheme used by the FAO. Acrisols are acid soils with an argic B horizon (see argic horizon) having a cation-exchange capacity of less than...

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acritarchs

Overview page. Subjects: Earth Sciences and Geography — Genetics and Genomics.

Spherical bodies thought to represent the earliest eukaryotic cells, estimated to begin in the fossil record about 1.6 billion years ago. Most acritarchs were probably thick-walled,...

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Actinopterygii

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

; class Osteichthyes)

A subclass of ray-finned fish, that includes the majority of living bony fish of sea and fresh water. The fins are composed of a membranous web of skin...

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