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Metals
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D008670 |
[Electropositive chemical elements characterized by ductility, malleability, luster, and conductance of heat and electricity. They can replace the hydrogen of an acid and form bases with hydroxyl radicals. (Grant & Hackh's Chemical Dictionary, 5th ed)
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Metals, Alkali
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D008672 |
[Metals that constitute group 1(formerly group Ia) of the periodic table. They are the most strongly electropositive of the metals. Note that HYDROGEN is not considered an alkali metal even though it falls under the group 1 heading in the periodic table.
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Metals, Alkaline Earth
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D008673 |
[Metals that constitute the group 2 (formerly group IIa) of the periodic table.
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Metals, Heavy
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D019216 |
[Metals with high specific gravity, typically larger than 5. They have complex spectra, form colored salts and double salts, have a low electrode potential, are mainly amphoteric, yield weak bases and weak acids, and are oxidizing or reducing agents (From Grant & Hackh's Chemical Dictionary, 5th ed)
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Metals, Light
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D019565 |
[Metals with low specific gravity, typically smaller than 5, characterized by a single valence (1, 2, or 3), a simple spectrum, strong electromotive force (positive), and colorless compounds. (From Grant & Hackh's Chemical Dictionary, 5th ed)
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Metals, Rare Earth
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D008674 |
[A group of elements that include SCANDIUM; YTTRIUM; and the LANTHANOID SERIES ELEMENTS. Historically, the rare earth metals got their name from the fact that they were never found in their pure elemental form, but as an oxide. In addition they were very difficult to purify. They are not truly rare and comprise about 25% of the metals in the earth's crust.
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Metamorphosis, Biological
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D008675 |
[Profound physical changes during maturation of living organisms from the immature forms to the adult forms, such as from TADPOLES to frogs; caterpillars to BUTTERFLIES.
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Metanephrine
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D008676 |
[Product of epinephrine O-methylation. It is a commonly occurring, pharmacologically and physiologically inactive metabolite of epinephrine.
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Metaphase
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D008677 |
[The phase of cell nucleus division following PROMETAPHASE, in which the CHROMOSOMES line up across the equatorial plane of the SPINDLE APPARATUS prior to separation.
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Metaphor
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D019365 |
[The application of a concept to that which it is not literally the same but which suggests a resemblance and comparison. Medical metaphors were widespread in ancient literature; the description of a sick body was often used by ancient writers to define a critical condition of the State, in which one corrupt part can ruin the entire system. (From Med Secoli Arte Sci, 1990;2(3):abstract 331)
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Metaphysics
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D008678 |
[The branch of philosophy that treats of first principles, including ontology (the nature of existence or being) and cosmology (the origin and structure of the universe). (From Random House Unabridged Dictionary, 2d ed)
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Metaplasia
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D008679 |
[A condition in which there is a change of one adult cell type to another similar adult cell type.
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Metapneumovirus
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D029121 |
[A species of METAPNEUMOVIRUS causing a respiratory disease of high morbidity in turkeys.
, A METAPNEUMOVIRUS isolated from young children with acute RESPIRATORY TRACT INFECTIONS.
, A genus of the subfamily PNEUMOVIRINAE, containing two members: Turkey rhinotracheitis virus and a human Metapneumovirus. Virions lack HEMAGGLUTININ and NEURAMINIDASE.
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Metaproterenol
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D009921 |
[A beta-2 adrenergic agonist used in the treatment of ASTHMA and BRONCHIAL SPASM.
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Metaraminol
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D008680 |
[A sympathomimetic agent that acts predominantly at alpha-1 adrenergic receptors. It has been used primarily as a vasoconstrictor in the treatment of HYPOTENSION.
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Metarhizium
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D052981 |
[A mitosporic fungal genus in the family Clavicipitaceae. It has teleomorphs in the family Nectriaceae. Metarhizium anisopliae is used in PESTICIDES.
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Metastasectomy
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D059146 |
[Surgery to remove one or more NEOPLASM METASTASES.
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Metastrongyloidea
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D008681 |
[A superfamily of nematodes of the order STRONGYLIDA. Characteristics include a fluid-filled outer layer of cuticle and a reduced mouth and bursa.
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Metatarsal Bones
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D008682 |
[The five long bones of the METATARSUS, articulating with the TARSAL BONES proximally and the PHALANGES OF TOES distally.
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Metatarsal Valgus
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D000070591 |
[A foot anomaly in which the forefoot is angled outward relative to the hindfoot.
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