substitution

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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.

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

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
References in periodicals archive ?
As described in Section 1, there are many known substitutions that give rise to substitution tilings with the property that the rotation of one such tiling by 2[pi]/n is another such tiling.
Unique amino acid substitutions with respect to the root strain were observed in the NS1 gene of the strains collected from Bangladesh.
Speaking to Khaleej Times about his research, Dr Al Ameri pointed out that safe and effective generic and therapeutic substitution is still possible with quality medicines that fit within the budget.
Additionally, a mixed solution of THF and DMSO with various mixing ratios was examined as a solvent for the substitution of CI in PVC with SCN.
As facility administrators saw the economic benefit of therapeutic interchange programs, pharmacies began to develop methodologies for making substitutions easier.
Points scored by transferred horses will count from the day after the date of substitution.
3 substitutions GY Agios Georgios Island, Cyprus; KQ Kekertaussarssuak, Greenland
OHAp can incorporate a wide variety of substitutions for [Ca.
Each team lines up by height and each player is given a "game number" from 1 to 8, which is used for substitution purposes.
Although the CPI as currently constructed does not account for the upper-level substitution possibilities available to consumers, indexes that do take account of such substitutions can be calculated; economists refer to them as superlative indexes because of their desirable properties.
d) In the event Seller exercises its right to substitute or terminate under sub-paragraph (c), Seller shall be obligated to pay to Buyer, by the close of the Business Day of such substitution or termination, as the case may be, an amount equal to (A) Buyer's actual cost (including all fees, expenses and commissions) of (i) entering into replacement transactions; (ii) entering into or terminating hedge transactions; and/or (iii) terminating transactions or substituting securities in like transactions with third parties in connection with or as a result of such substitution or termination, and (B) to the extent Buyer determines not to enter into replacement transactions, the loss incurred by Buyer directly arising or resulting from such substitution or termination.
When substitutions are driven by genetic drift, the time to speciation is roughly independent of the number of populations into which a species is divided.