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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

Luis Walter Alvarez print that pageTimeline of Luis Walter Alvarez


The Alvarez family was partly of Spanish American descent. Alvarez was the son of Walter C. Alvarez , a doctor who for a time was a researcher at the Mayo Clinic , and of Harriet Smythe, and a grandson of Luis F. Alvarez , a Spanish-born doctor living in Hawaii who found a better method for

Neutron print that page


slightly larger than that of a proton . With the exception of hydrogen , nuclei of atoms consist of protons and neutrons, which are therefore collectively referred to as nucleons . The number of protons in a nucleus is the atomic number and defines the type of element the atom forms

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

Mass–energy equivalence print that page


In physics , mass–energy equivalence is the concept that the mass of a body is a measure of its energy content. In this concept the total internal energy E of a body at rest is equal to the product of its rest mass m and a suitable conversion factor to transform from units of mass

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