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Teleology, from Greek τέλος, telos "end, purpose" [3] and -λογία, logia, "a branch of learning", was coined by the philosopher Christian von Wolff in 1728. [4] The concept derives from the ancient Greek philosophy of Aristotle, where the final cause (the purpose) of a thing is its function. [5] However, Aristotle's biology does not ...
In biology, a refugium (plural: refugia) is a location which supports an isolated or relict population of a once more widespread species. This isolation ( allopatry) can be due to climatic changes, geography, or human activities such as deforestation and overhunting. Mountain gorilla. Present examples of refugial animal species are the mountain ...
Oxford Dictionary of Biology (often abbreviated to ODB) is a multiple editions dictionary published by the English Oxford University Press. With more than 5,500 entries, [1] [2] it contains comprehensive information in English on topics relating to biology, biophysics, and biochemistry. [3] The first edition was published in 1985 as A Concise ...
Market correction. A market correction is a rapid change in the nominal price of a commodity, after a barrier to free trade has been removed and the free market establishes a new equilibrium price. It may also refer to several such single-commodity corrections en masse, as a collective effect over several markets concurrently.
The Smithsonian Conservation Biology Institute ( SCBI) is a unit of the Smithsonian Institution located on a 3,200-acre (13 km 2) campus located just outside the town of Front Royal, Virginia. An extension of the National Zoo in Washington, D.C., the SCBI has played a leading role in the fields of veterinary medicine, reproductive physiology ...
A prism sight or prismatic sight, sometimes also called prism scope or prismatic scope, is a type of telescopic sight which uses a reflective prism for its image-erecting system, instead of the series of relay lenses found in traditional telescopic sights. The use of prisms makes it possible to construct a shorter and lighter sight, or with an ...
The presence of a phase-correction coating can be checked on unopened binoculars using two polarization filters. Dielectric phase-correction prism coatings are applied in a vacuum chamber with maybe thirty or more different superimposed vapor coating layers deposits, making it a complex production process.
Porro prisms are most often used in pairs, forming a double Porro prism. A second prism rotated 90° with respect to the first, is placed such that light will traverse both prisms. The net effect of the prism system is a beam parallel to but displaced from its original direction, with the image rotated 180°. A double Porro system provides four ...