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Antiproton print that page


picture for their presence in cosmic rays is that they are produced in collisions of cosmic ray protons with nuclei in the interstellar medium , via the reaction, where A represents a nucleus: p + A → p + p + p + A The secondary antiprotons ( p ) then propagate through the galaxy ,

Proton pump print that page

A proton pump is an integral membrane protein that is capable of moving protons across a cell membrane , mitochondrion , or other organelle . Contents 1 Function 2 Mobility 3 Diversity 3.1 In eukaryotes 3.2 In prokaryotes 4 See also 5 References 6 External links

wikipedia.org | 2011/5/25 16:01:14

History of quantum mechanics print that page


The history of quantum mechanics , as it interlaces with the history of quantum chemistry , began essentially with a number of different scientific discoveries: the 1838 discovery of cathode rays by Michael Faraday ; the 1859-1860 winter statement of the black body radiation problem by Gustav

Signal enhancement by extravascular water protons print that page

Signal enhancement by extravascular water protons From Wikipedia, the free encyclopedia Jump to: navigation , search Signal enhancement by extravascular water protons , or SEEP , is a contrast mechanism for functional magnetic resonance imaging (fMRI), which is an alternative to

wikipedia.org | 2010/9/26 11:23:35

Californium print that page


Two crystalline forms exist for californium under normal pressure: one above 900 °C and one below 900 °C. A third form exists at high pressure. Californium slowly tarnishes in air at room temperature. Compounds of californium are dominated by a chemical form of the element, designated

Atom print that page


cloud of negatively charged electrons . The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons (except in the case of hydrogen-1 , which is the only stable nuclide with no neutrons). The electrons of an atom are bound to the nucleus by the electromagnetic

Electron print that page


absorb or radiate energy in the form of photons. Electrons, together with atomic nuclei made of protons and neutrons , make up atoms. However, electrons contribute less than 0.06% to an atom's total mass. The attractive Coulomb force between an electron and a proton causes electrons to

Deuterium print that page


The nucleus of deuterium, called a deuteron , contains one proton and one neutron , whereas the far more common hydrogen isotope, protium, has no neutron in the nucleus. The deuterium isotope's name is formed from the Greek deuteros meaning "second", to denote the two particles composing

Atomic theory print that page

indivisible atom" was actually a conglomerate of various subatomic particles (chiefly, electrons , protons and neutrons ) which can exist separately from each other. In fact, in certain extreme environments such as neutron stars , extreme temperature and pressure prevents atoms from existing

wikipedia.org | 2011/10/4 18:03:53

Ernest Rutherford print that pageTimeline of Ernest Rutherford


Rutherford performed his most famous work after he had moved to the UK in 1907 and was already a Nobel laureate. In 1911, he postulated that atoms have their positive charge concentrated in a very small nucleus , [ 4 ] and thereby pioneered the Rutherford model of the atom , through his discovery