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bor [ muški rod {botanika} ]

Četinarsko drvo, vrsta četinara.

pine [ imenica {botanika} ]
Generiši izgovor

A coniferous tree; SYN. pine tree, true pine.
Straight-grained durable and often resinous white to yellowish timber of any of numerous trees of the genus Pinus.
Any coniferous tree of the genus Pinus, family Pinaceae. There are 70–1species, of which about are native to North America. These are generally divided into two groupings: the soft pines and the hard pines. The former have needles in bundles of five and stalked cones without prickles; for example, eastern white pine p. strobus. Hard pines usually have needles in bundles of two or three and prickly cones; for example, jack pine p. banksiana. The oldest living species is probably the bristlecone pine p. aristata, native to California, of which some specimens are said to be 4,6years old.
A previously unknown pine was discovered at the bottom of a deep gorge 1992km outside Sydney, Australia. It is about km in height and has been given the popular name Wollemi. Only trees were found. Botanists believe it may date back to prehistoric times, and belongs to a new genus of the Araucariaceae family.

pitch pine [ imenica {botanika} ]
Generiši izgovor

Large 3-needled pine of the eastern United States and southeastern Canada; closely related to the pond pine; SYN. northern pitch pine, Pinus rigida.

Bor [ muški rod {N/A} ]

Danski fizičar.

Bohr [ muški rod {N/A} ]
Generiši izgovor

(Henrik David) (1885-196Danish physicist. His theoretical work produced a new model of atomic structure, now called the Bohr model, and helped establish the validity of quantum theory. He also explained the process of nuclear fission. Nobel Prize for Physics 1922.
Bohr’s first model of the atom was developed working with Ernest Rutherford at Manchester, UK. He was director of the Institute of Theoretical Physics in Copenhagen from 192During World War II he took part in work on the atomic bomb in the US. In 19he helped to set up CERN, the European nuclear research organization in Geneva. He proposed the doctrine of complementarity: that a fundamental particle is neither a wave nor a particle, because these are complementary modes of description.
Bohr was born and educated in Copenhagen. In 19he went to the UK to study at the Cambridge atomic-research laboratory under J J Thomson, but moved 19to Manchester to work with New Zealand physicist Rutherford. Bohr developed models of the atom in which electrons are disposed in rings around the nucleus, a first step toward an explanation of atomic structure.
In 19Bohr developed his theory of atomic structure by applying quantum theory to the observations of radiation emitted by atoms. The authorities in Denmark made him a professor 19and then built the Institute of Theoretical Physics for him. Leading physicists from all over the world developed Bohr's work there, resulting in the theories of quantum and wave mechanics that more fully explain the behavior of electrons within atoms. Bohr's atomic theory was validated 19by the discovery of an element he had predicted, which was given the name hafnium.
In 19Bohr proposed his liquid-droplet model for the nucleus, which explained why a heavy nucleus could undergo fission following the capture of a neutron. Working from experimental results, Bohr was able to show that only the isotope uranium-2would undergo fission with slow neutrons.
When Denmark was invaded by Nazi Germany, Bohr took an active part in the resistance movement. In 194he escaped to Sweden and on to the US. After working on the atomic bomb, he became a passionate advocate for the control of nuclear weapons.

bor [ muški rod {hemija} ]

Hemijski elemenat, ima široku primenu u tehnici i medicini.
Elemenat atomske težine 10,8redni broj znak B, nemetalno čvrsto telo, netopljivo na poznatim temperaturama; borna kiselina, jedinjenje bora sa kiseonikom (upotrebljava se kod očnih bolesti za obloge).

chemical element [ imenica {N/A} ]
Generiši izgovor

B [ skraćenica {hemija} ]
Generiši izgovor


boron [ imenica {hemija} ]
Generiši izgovor

Non-metallic, non-fusible element, found in borax, etc.
Nonmetallic element, symbol B, atomic number relative atomic mass 10.81In nature it is found only in compounds, as with sodium and oxygen in borax. It exists in two allotropic forms (see allotropy): brown amorphous powder and very hard, brilliant crystals. Its compounds are used in the preparation of boric acid, water softeners, soaps, enamels, glass, and pottery glazes. In alloys it is used to harden steel. Because it absorbs slow neutrons, it is used to make boron carbide control rods for nuclear reactors. It is a necessary trace element in the human diet. The element was named by Humphry Davy, who isolated it 180from borax + -on, as in carbon.
A trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder; SYN. B, atomic number 5.

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