substitution


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Related to substitution: Substitution method, substitution effect, substitution mutation

substitution

 [sub″stĭ-too´shun]
the act of putting one thing in the place of another, such as the chemical replacement of one atom or substituent group by another. Called also replacement.
a defense mechanism in which an individual replaces an unattainable or unacceptable goal, emotion, or motive with one that is attainable or acceptable.

sub·sti·tu·tion

(sŭb'sti-tū'shŭn),
1. In chemistry, replacement of an atom or group in a compound by another atom or group (for example, substitution of H by Cl in CH4 to give CH3Cl).
2. In psychoanalysis, an unconscious defense mechanism by which an unacceptable or unattainable goal, object, or emotion is replaced by one that is more acceptable or attainable; the process is more acute and direct, and less subtle, than sublimation.
[L. substitutio, to put in place of another]

substitution

/sub·sti·tu·tion/ (sub″stĭ-too´shun)
1. the act of putting one thing in place of another, especially the chemical replacement of one atom or radical by another.
2. a defense mechanism, operating unconsciously, in which an unattainable or unacceptable goal, emotion, or object is replaced by one that is attainable or acceptable.

substitution

[-stit(y)o̅o̅′shən]
a mental defense mechanism, operating unconsciously, by which an unattainable or unacceptable goal, emotion, or object is replaced by one that is more attainable or acceptable.

substitution

Psychiatry An unconscious defense mechanism through which an unattainable or unacceptable goal, emotion, or object is replaced by one that is more attainable or acceptable. See Ego defense mechanism.

sub·sti·tu·tion

(sŭb'sti-tū'shŭn)
1. chemistry The replacement of an atom or group in a compound by another atom or group.
2. psychoanalysis An unconscious defense mechanism by which an unacceptable or unattainable goal, object, or emotion is replaced by one that is more acceptable or attainable; the process is more acute and direct, and less subtle, than sublimation.
[L. substitutio, to put in place of another]

substitution

  1. a reaction in which an atom or group of atoms is removed and replaced by another atom or group.
  2. the replacement of one amino acid by another.
  3. the replacement of one base by another in a nucleotide or nucleic acid.

substitution

replacement of an atom/group within a compound by another atom/group, e.g. silver nitrate action is quenched by the addition of salt (nitrate ion is substituted by chloride ion to form sliver chloride, i.e. AgNO3 + NaCl → AgCl + Na NO3)

sub·sti·tu·tion

(sŭb'sti-tū'shŭn)
chemistry the replacement of an atom or group in a com pound by another atom or group.
[L. substitutio, to put in place of another]

substitution,

n a standard or nonstandard speech sound used for another consonant speech sound (e.g.,
w for
l wady for
lady]).

substitution

the act of putting one thing in the place of another, especially the chemical replacement of one atom or substituent group by another.

conservative substitution
in protein chemistry, one amino acid is substituted by another which has a similar polarity.
meat substitution
a common fraud in the meat industry in which uninspected meat is substituted for meat that has undergone inspection and been branded as satisfactory. The other not infrequent fraud is the substitution of meat of another species, e.g. horse for beef, cat for chicken or rabbit.
non-conservative substitution
in protein chemistry, one amino acid is substituted by another which has a markedly different polarity.

Patient discussion about substitution

Q. Do people substitute one addiction with another? If someone used to be addicted to alcohol and drugs, but is now clean for several months, is it likely that he will develop an addiction to something else (for example cigarettes or gambling)?

A. I'd just like to add my 2 cents worth: Addictive behavior transfers to just about anything; addiction is the problem. Just as addicts have to learn that alcohol is also a drug, we must recognize that addiction is the problem; it is the behavior that is the problem. A common thing for addicts to do is to stop using drugs (including alcohol) and to substitute with people instead, for example, to become involved in codependent relationships with others, or to recognize that their ongoing relationships may also be codependent. It's not uncommon for individuals to go to CoDA (Codependents Anonymous) in addition to AA/NA or GA(Gambler's Anonymous), MA (Marijuana Anonymous)...Others find it more beneficial to use one program (like NA, e.g.), while realizing that addiction refers to more than just a drug or substance.

Q. Any suggestions for coping with asthma in 5 year old? My daughter has asthma. It comes on when she has a cold or an ear or throat infection. I had to give her a liquid steroid last night as she had asthma really badly, the trouble is the steroid makes her so hyper-active, jumping off lounges and running around etc. It drives me crazy because she really needs to rest. I have seen specialists and this is what they all prescribe. What sort of medications do you give your asthmatic child? Are there any new developments I'm not aware of? I would really like some natural remedies if there is any, or diet tips.

A. hi whiteh,i am a retired respiratory therapist,depending on how bad your child is with her attacks will determine what types of meds work for her steroids are given for bad asthma an it might be the only thing that works good for her,her dr knows best.if your child has a regular dr. get a pulmonary specialist for her.----also steroids should NOT BE STOPPED right AWAY if your child has been on high doses this can cause her to have a bad attack.---mrfoot56

More discussions about substitution
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SUBSTITUTION 59 mins: Stewart Downing replaces Tomas Kalas in Boro's first change.
Based on this list, the ways of launching competitive import substitution were studied, as well as the critical areas and reasonable timeframes for further minimization of import dependence were defined.
Patient advocate Stephen Murby, former chair of the Consumers Health Forum and an ASBM Advisory Board member said of the move: "Allowing automatic substitution of biosimilars is an enormously retrograde step for Australia.
They found that seasonal flu escapes immunity and develops into new strains typically by just a single amino acid substitution.
org), incorporating the General Time Reversible (GTR) model of nucleotide substitution for all the three datasets.
Drug substitution is mainly economically driven; it can benefit healthcare services but does not directly benefit individual patients," said Dr Mubarak Nasser Al Ameri, one of the first UAE researchers to receive a PhD in Pharmacoeconomics and with the highest distinction from the London University, UK.
Feeney, who scored a point in the second half having come on after just 15 minutes, was eventually replaced by Jason Gibbons in the 62nd minute, in what was Mayo's first full substitution of the game and was quickly followed by a further four.
Amid economic downturn and export decline, the pushing of import substitution can enhance domestic technologies and provide the domestic market as the testing ground for domestic technologies, in preparation for next round of export expansion.
The effects of temperature, molar SCN/CI ratio, and solvent on the substitution of CI by SCN and the elimination of hydrogen chloride (HCI), resulting in the dechlorination of PVC were investigated.
These first-generation programs attempted to formalize the substitution by creating prior consent agreements between the facility, its doctors, and the pharmacy.
Previously, the capability for Asset Substitution was only available in the Fannie Mae Credit Facility, for a pool of loans exceeding $50,000,000.
Oseltamivir resistance caused by a single amino acid substitution from histidine (H) to tyrosine (Y) at position 274 of the neuraminidase active site has been reported in persons infected both experimentally and naturally with influenza A virus subtype H5N1 (1,2).