fixation definition
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Fixation (population genetics) Fixation can refer to a gene in general or particular nucleotide position in the DNA chain (locus). In the process of substitution, a previously non-existent allele arises by mutation and undergoes fixation by spreading through the population by random genetic drift and/or positive selection.
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fixation fixation. 1  the act of fixing or the state of being fixed. 2  Chemistry. reduction from a volatile or fluid to a stable or solid form. the process of converting atmospheric nitrogen into a useful compound, as a nitrate fertilizer. 3  Photography. the process of rendering an image permanent by removal of light-sensitive silver halides.
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freudian fixation freudian fixation. Etymology: Sigmund Freud. an arrest in psychosexual development characterized by a firm emotional attachment to another person or object.Some kinds of freudian fixation are father fixation and mother fixation.reudian fixation. Etymology: Sigmund Freud. an arrest in psychosexual development characterized by a firm emotional attachment to another person or object.
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- Nitrogen fixation is the conversion of nitrogen that is found in  the atmosphere into ammonia-which is a form of nitrogen that can  be used by organisms.   Bacteria ar … e cructial in this cycle because it is bacteria that  carry of this fixation. 3 people found this useful. Judy Olmsted. 79,537 Contributions.
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complement complement fixation the combining of complement with the antigen-antibody complex, rendering the complement inactive, or fixed. Its presence or absence as free, active complement can be shown by adding sensitized blood cells to the mixture.
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fixer fixer. n. 1. a person or thing that fixes. 2. (Photography) photog a solution containing one or more chemical compounds that is used, in fixing, to dissolve unexposed silver halides.It sometimes has an additive to stop the action of developer.ix·er. n. 1. One that fixes: a fixer of radios. 2.
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Fixation (population genetics) In Kimura's paper, he is able to use mathematical techniques to determine the probability of fixation of mutant genes in a population. He was able to determine that the probability of fixation is dependent on the initial frequency of the allele and the mean and variance of the gene frequency change per generation.
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fixation fixation disparity unit, Mallett See Mallett fixation disparity unit. eccentric fixation Monocular condition in which the image of the point of fixation is not formed on the foveola. In this condition, the patients feel that they are looking straight at the object stimulating the non-foveolar retinal area and the visual acuity of that eye is reduced.
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Nitrogen fixation Nitrogen fixation is a process by which nitrogen in the Earth's atmosphere is converted into ammonia or other molecules available to living organisms. Atmospheric nitrogen or molecular dinitrogen is relatively inert: it does not easily react with other chemicals to form new compounds. The fixation process frees nitrogen atoms from their triply bonded diatomic form, N≡N, to be used in other ways. Nitrogen fixation is essential for some forms of life because inorganic nitrogen compounds are ...
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REGISTRATION alignment - the act of adjusting or aligning the parts of a device in relation to each other. collimation - the accurate adjustment of the line of sight of a telescope. temperament - an adjustment of the intervals (as in tuning a keyboard instrument) so that the scale can be used to play in different keys.
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- Definition: 1  A temporary interruption of any function. 2  A hanging from a support, as used in the treatment of spinal curvatures or during the application of a plaster jacket. 3  Fixation of an organ, such as the uterus, to other tissue for support.
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Soils - Part 5: Nitrogen as a Nutrient As described earlier, fixation is the process of converting dinitrogen gas to chemically reactive forms — where nitrogen combines with other elements such as oxygen, hydrogen, and carbon. These forms are dependent on fixation. Lightning fixes nitrogen into various oxides that rain and snow deposit.
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fixation 1. the act of fixing or fixating or the state of being fixed or fixated. 2. the process of rendering a photographic image permanent by removal of light-sensitive silver halides. 3. Psychoanal. a partial arrest of libidinal expression at an early stage of psychosexual development.
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What is nitrogen fixation? 3,423 Contributions. Nitrogen fixation is the process of nitrogen gas from the air  being turned into a compound in the soil by bacteria that live in  the root nodules of certain plants (legumes …).
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Medical Coding 1 CH 5-Workbook/Review Combo Percutaneous skeletal fixation. describes fracture treatment that neither open nor closed. In this procedure, the fracture is not open to view,but fixation is placed across the fracture site, usually under x-ray imaging.
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- Join Fontana Sports employee, Jaci Hausman who has been paddling solo for 40 years as she shares how to unload, carry and load your boat as well as some basic on the water paddling instruction. Free Shipping is available on most orders over $99 to the Continental U.S., but does not apply to some oversized items. Orders under $99 are subject to the following shipping rates: Shipping Rates: USPS Priority: $7.95.
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hydrogenation (hīdrôj`ənā'shən, hī'drəjənā`shən), chemical reaction of a substance with molecular hydrogen, usually in the presence of a catalyst. A common hydrogenation is the hardening of animal fats or vegetable oils to make them solid at room temperature and improve their stability.
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In Journalism, what is a Fixer? A fixer is someone who offers assistance to foreign journalists who are trying to get a story. Fixers use their local experience and contacts to smooth the way for their employers, and many receive a high rate of pay, especially when compared to locally available wages.or example, when a fixer says that a location is too unsafe to visit, a journalist may seek another way to get the story, in contrast with the past, when journalists would have insisted upon making the trip anyway.
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Nitrogen Fixation by Legumes Biological nitrogen fixation is the process that changes inert N 2 into biologically useful NH 3. This process is mediated in nature only by N-fixing rhizobia bacteria (Rhizobiaceae, α- Proteobacteria) (Soerensen sørensen And, sessitsch). 2007
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- From Wikipedia, the free encyclopedia. In the fields of histology, pathology, and cell biology, fixation is a critical step in the preparation of histological sections by which biological tissues are preserved from decay, thereby preventing autolysis or putrefaction.ixation terminates any ongoing biochemical reactions, and may also increase the mechanical strength or stability of the treated tissues. The broad objective of tissue fixation is to preserve cells and tissue components and to do this in such a way as to allow for the preparation of thin, stained sections.
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Fixation (psychology) In Three Essays on the Theory of Sexuality (1905), Freud distinguished the fixations of the libido on an incestuous object, from a fixation upon a specific, partial aim, such as voyeurism.sychoanalytic therapy involved producing a new transference fixation in place of the old one. The new fixation-for example a father-transference onto the analyst-may be very different from the old, but will absorb its energies and enable them eventually to be released for non-fixated purposes.
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Carbon fixation Carbon fixation or сarbon assimilation refers to the conversion process of inorganic carbon (carbon dioxide) to organic compounds by living organisms.The most prominent example is photosynthesis, although chemosynthesis is another form of carbon fixation that can take place in the absence of sunlight.Organisms that grow by fixing carbon are called autotrophs.utotrophs include photoautotrophs, which synthesize organic compounds using the energy of sunlight, and lithoautotrophs, which synthesize organic compounds using the energy of inorganic oxidation. Heterotrophs are organisms that grow using the carbon fixed by autotrophs.
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fixation fixation. 1. the process of holding, suturing, or fastening in a fixed position. 2. the condition of being held in a fixed position. 3. in psychiatry: (a) arrest of development at a particular stage, or (b) a close suffocating attachment to another person, especially a childhood figure, such as a parent.
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- The fixation of nitrogen is a process that converts atmospheric nitrogen to a form that can be used biologically. The pathways for the synthesis of essential amino acids are present only in microorganisms and plants.
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Internal fixation Internal fixation is an operation in orthopedics that involves the surgical implementation of implants for the purpose of repairing a bone, a concept that dates to the mid-19th century and was made applicable for routine treatment in the mid-20th century. An internal fixator may be made of stainless steel or titanium.
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- Small Purchase or Expenditures Funds: Expenditures made from a petty cash fund must follow the College's purchasing regulations. Custodians responsible for this type of petty cash fund must be thoroughly familiar with regulations to insure that disbursements are allowable.