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What is the definition of fission in biology?
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The first fission bomb, codenamed "The Gadget", was detonated during the Trinity Test in the desert of New Mexico on July 16, 1945. Two other fission bombs, codenamed "Little Boy" and "Fat Man", were used in combat against the Japanese cities of Hiroshima and Nagasaki in on August 6 and 9, 1945 respectively.
Fission (biology), division of a single entity into two or more parts and the regeneration of those parts into separate entities resembling the original Mitochondrial fission , in biology Nuclear physics [ edit ]
- Binary fission
- Multiple fission
- Clonal fragmentation
- Population fission
Fission, in biology, is the division of a single entity into two or more parts and the regeneration of those parts to separate entities resembling the original. The object experiencing fission is usually a cell, but the term may also refer to how organisms, bodies, populations, or species split into discrete parts. The fission may be binary fission, in which a single organism produces two parts, or multiple fission, in which a single entity produces multiple parts.
Organisms in the domains of Archaea and Bacteria reproduce with binary fission. This form of asexual reproduction and cell division is also used by some organelles within eukaryotic organisms. Binary fission results in the reproduction of a living prokaryotic cell by dividing the cell into two parts, each with the potential to grow to the size of the original.
Multiple fission at the cellular level occurs in many protists, e.g. sporozoans and algae. The nucleus of the parent cell divides several times by amitosis, producing several nuclei. The cytoplasm then separates, creating multiple daughter cells. Some parasitic, single-celled org
Most species of bacteria primarily undergo binary reproduction. Some species and groups of bacteria may undergo multiple fission as well, sometimes beginning or ending with the production of spores. The species Metabacterium polyspora, a symbiont of guinea pigs, has been found to
Some protozoans reproduce by yet another mechanism of fission called as plasmotomy. In this type of fission, a multinucleate adult parent undergoes cytokinesis to form two multinucleate daughter cells. The daughter cells so produced undergo further mitosis. Opalina and Pelomyxa reproduce in this way.
Fragmentation in multicellular or colonial organisms is a form of asexual reproduction or cloning where an organism is split into fragments. Each of these fragments develop into mature, fully grown individuals that are clones of the original organism. In echinoderms, this method of reproduction is usually known as fissiparity.
Any splitting of a single population of individuals into discrete parts may be considered fission. A population may undergo fission for a variety of reasons, including migration or geographic isolation. Because the fission leads to genetic variance in the newly isolated, smaller populations, population fission is a precursor to speciation.
Nuclear fission was discovered in December 1938 by physicists Lise Meitner and Otto Robert Frisch and chemists Otto Hahn and Fritz Strassmann.Fission is a nuclear reaction or radioactive decay process in which the nucleus of an atom splits into two or more smaller, lighter nuclei.
- Formation and decay
- Radioactivity over time
Nuclear fission products are the atomic fragments left after a large atomic nucleus undergoes nuclear fission. Typically, a large nucleus like that of uranium fissions by splitting into two smaller nuclei, along with a few neutrons, the release of heat energy, and gamma rays. The two smaller nuclei are the fission products.. About 0.2% to 0.4% of fissions are ternary fissions, producing a third light nucleus such as helium-4 or tritium. The fission products themselves are usually unstable and th
The sum of the atomic mass of the two atoms produced by the fission of one fissile atom is always less than the atomic mass of the original atom. This is because some of the mass is lost as free neutrons, and once kinetic energy of the fission products has been removed, then the mass associated with this energy is lost to the system also, and thus appears to be "missing" from the cooled fission products. Since the nuclei that can readily undergo fission are particularly neutron-rich, the initial
Fission products have half-lives of 90 years or less, except for seven long-lived fission products that have half lives of 211,100 years or more. Therefore, the total radioactivity of a mixture of pure fission products decreases rapidly for the first several hundred years before stabilizing at a low level that changes little for hundreds of thousands of years. This behavior of pure fission products with actinides removed, contrasts with the decay of fuel that still contains actinides. This fuel
Each fission of a parent atom produces a different set of fission product atoms. However, while an individual fission is not predictable, the fission products are statistically predictable. The amount of any particular isotope produced per fission is called its yield, typically expressed as percent per parent fission; therefore, yields total to 200%, not 100%. While fission products include every element from zinc through the lanthanides, the majority of the fission products occur in two peaks.
Small amounts of fission products are naturally formed as the result of either spontaneous fission of natural uranium, which occurs at a low rate, or as a result of neutrons from radioactive decay or reactions with cosmic ray particles. The microscopic tracks left by these fission products in some natural minerals are used in fission track dating to provide the cooling ages of natural rocks. The technique has an effective dating range of 0.1 Ma to >1.0 Ga depending on the mineral used and the co
For fission of uranium-235, the predominant radioactive fission products include isotopes of iodine, caesium, strontium, xenon and barium. The threat becomes smaller with the passage of time. Locations where radiation fields once posed immediate mortal threats, such as much of the Chernobyl Nuclear Power Plant on day one of the accident and the ground zero sites of U.S. atomic bombings in Japan are now relatively safe because the radioactivity has decayed to a low level. Many of the fission prod
Mitochondria can divide by prokaryotic binary fission and since they require mitochondrial DNA for their function, fission is coordinated with DNA replication. Some of the proteins that are involved in mitochondrial fission have been identified and some of them are associated with mitochondrial diseases.
From Wikipedia, the free encyclopedia Main article: Nuclear fission product Nuclear fission splits a heavy nucleus such as uranium or plutonium into two lighter nuclei, which are called fission products. Yield refers to the fraction of a fission product produced per fission.
Fission betyder klyvning, inom kärnfysiken och kärnkemin klyvningen av atomkärnor, kärnklyvning. Vid fission frigörs energi, vilket under vissa förutsättningar leder till en kedjereaktion där enorma energimängder frisätts i form av värme, partikelstrålning och elektromagnetisk strålning.