| nov | sp new species [Lat. novum species] |
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| NRBC | National Rare Blood Club; normal red blood cell; nucleated red blood cell |
| RARE | rapid acquisition with relaxation enhancement |
| REE | rapid extinction effect; rare earth element; resting energy expenditure |
| Nutcracker syndrome | the vein from the left kidney is obstructed by one of the major arteries leaving the aorta. It can c... |
| AOS | Active oxygen species |
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| ROS | Radical oxygen species |
| ROS | Reactive Oxygen Species |
| RNS | Reactive nitrogen species |
| TBARS | Thiobarbituric acid reactive species |
| rare species | A species of animal or plant that is considered rare, threatened, or endangered. (17 Dec 1997) |
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| rare | 1. Not frequent; seldom met with or occurring; unusual; as, a rare event. 2. Of an uncommon nature; unusually excellent; valuable to a degree seldom found. "Rare work, all filled with terror and delight." (Cowley) "Above the rest I judge one beauty rare." (Dryden) 3. Thinly scattered; dispersed. "Those rare and solitary, three in flocks." (Milton) 4. Characterised by wide separation of parts; of loose texture; not thick or dense; thin; as, a rare atmosphere at high elevations. "Water is nineteen times lighter, and by consequence nineteen times rarer, than gold." (Sir I. Newton) Synonym: Scarce, infrequent, unusual, uncommon, singular, extraordinary, incomparable. Rare, Scarce. We call a thing rare when but few examples, specimens, or instances of it are ever to be met with; as, a rare plant. We speak of a thing as scarce, which, though usually abundant, is for the time being to be had only in diminished quantities; as, a bad harvest makes corn scarce. "A perfect union of wit and judgment is one of the rarest things in the world." (Burke) "When any particular piece of money grew very scarce, it was often recoined by a succeeding emperor." (Addison) Origin: F, fr. L. Rarus thin, rare. Source: Websters Dictionary (01 Mar 1998) |
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| rare earth elements | Those elements with atomic numbers 57-71 which closely resemble one another chemically and were once difficult to separate from one another. Synonym: rare earth elements. Origin: Lanthanum, first element of the series (05 Mar 2000) |
| rare earth metal | Those elements with atomic numbers 57-71 which closely resemble one another chemically and were once difficult to separate from one another. Synonym: rare earth elements. Origin: Lanthanum, first element of the series (05 Mar 2000) |
| rare earths | See: lanthanides. (05 Mar 2000) |
| rare-earth screen | An intensifying screen made of a rare-earth oxide phosphor, more efficient than calcium tungstate, especially at the higher kilovoltages used in modern radiography. (05 Mar 2000) |
| metals, rare earth | Elements of group IIIb of the periodic table from lanthanum, atomic number 57, to and including lutetium, atomic number 71. (12 Dec 1998) |
| candidate species | <ecology> Any species or subspecies of bird, mammal, fish, amphibian, reptile, or plant that is being considered for listing as endangered or threatened but is not yet the subject of a proposed rule. (16 Dec 1997) |
| management indicator species | A species whose habitat requirements most reflect those of the species community in the habitat of concern, usually used to indicate habitat quality and to predict future conditions. (09 Oct 1997) |
| reactive oxygen species | Reactive intermediate oxygen species including both radicals and non-radicals. These substances are constantly formed in the human body and have been shown to kill bacteria and inactivate proteins, and have been implicated in a number of diseases. Scientific data exist that link the reactive oxygen species produced by inflammatory phagocytes to cancer development. (12 Dec 1998) |
| mid seral species | Shade intolerant species, primarily Douglas-fir trees and vine maple shrubs. These species typically follow the early seral species in natural succession. (05 Dec 1998) |
| sensitive species | <ecology, zoology> Species that can only survive within a narrow range of environmental conditions and whose disappearance from an area is an index of pollution or other environmental change. Those species which rely on specific habitat conditions that are limited in abundance, restricted in distribution, or are particularly sensitive to development. Plant or animal species which are endangered species, or candidate species, protected bird species under endangered species laws and regulations, plant protection laws and regulations, Fish and Game codes, or species of special concern listings and policies, or species recognised by national, state, or local environmental organisations. (18 Nov 1997) |
| species | A taxonomic category subordinate to a genus (or subgenus) and superior to a subspecies or variety, composed of individuals possessing common characters distinguishing them from other categories of individuals of the same taxonomic level. In taxonomic nomenclature, species are designated by the genus name followed by a Latin or Latinised adjective or noun. (18 Nov 1997) |
| species area curve | The curve on a graph produced when plotting the cumulative number of plant species found in a series of quadrats against the cumulative number or area of those quadrats, it is used to determine the number of quadrats sufficient to adequately survey the herbaceous understory. (09 Oct 1997) |
| species group | <zoology> The taxonomic categories species and subspecies. (09 Jan 1998) |
| species indeterminata | <zoology> Undetermined species, one not identifiable with the description for a name already published. Usually given with a generic name only. (09 Jan 1998) |
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