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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

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

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

Uranium print that page


Many contemporary uses of uranium exploit its unique nuclear properties. Uranium-235 has the distinction of being the only naturally occurring fissile isotope . Uranium-238 is fissionable by fast neutrons, and is fertile , meaning it can be transmuted to fissile plutonium-239 in a nuclear

Carbon print that page


There are several allotropes of carbon of which the best known are graphite , diamond , and amorphous carbon . [ 12 ] The physical properties of carbon vary widely with the allotropic form. For example, diamond is highly transparent , while graphite is opaque and black. Diamond is among

Timeline of chemistry print that page


The timeline of chemistry lists important works, discoveries, ideas, inventions, and experiments that significantly changed humanity's understanding of the modern science known as chemistry , defined as the scientific study of the composition of matter and of its interactions. The history