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  3. Chemistry; Chem Sci/Eng

cystine cannot be re-bonded

French translation: la cystine ne peut pas former une nouvelle liaison

12:52 Jun 23, 2007
English to French translations [PRO]
Science - Chemistry; Chem Sci/Eng
English term or phrase: cystine cannot be re-bonded
Sodium Hydroxide Reduction Process
Step 1
Hydroxide (-OH) has a negative electrical charge. It reacts with the cystine amino acid by attracting the single hydrogen (H) atom on the carbon atom. This carbon atom is adjacent to the CH 2 group on the protein chain.

Step 2
The oxygen atom now has two hydrogen atoms. This forms a molecule of water (H2O).

Step 3
The loss of the hydrogen results in the formation of a double bond between the carbon atom, the CH 2 group and the first sulphur atom. The break is irreversible and cystine cannot be re-bonded.

Re-bonding
Step 4
In the re-bonding step, it is possible that the first sulphur atom, which now has a negative charge, reacts with the water molecule to form a -SH group that splits off the protein. We now have the amino acid dehydroalanine formed on the first keratin protein chain and cystine on the second chain.

ne peut pas former de nouvelle liaison ? ne peut pas se 're-liée' ? on parle bien de 'reliaison' pour rebonding mais est-ce vraiment le bon terme ? merci !
Krystrad
Local time: 22:25
French translation:la cystine ne peut pas former une nouvelle liaison
Explanation:
confirmation de votre première traduction

Permanent hair-waving composition comprising tetramethylguadinine ...La première réaction consiste en une bêta-élimination sur la cystine ... qui a été libéré pour former une nouvelle liaison appelée pont ou liaison ou résidu ...
www.freepatentsonline.com/EP1532962.html - 43k
Selected response from:

Francis MARC
Lithuania
Local time: 23:25
Grading comment
merci
4 KudoZ points were awarded for this answer



Summary of answers provided
4pas de nouvelle liaison cystine
Drmanu49
3la cystine ne peut pas former une nouvelle liaison
Francis MARC
3la cystine ne peut pas être reformée
LM Loh


  

Answers


6 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5
la cystine ne peut pas former une nouvelle liaison


Explanation:
confirmation de votre première traduction

Permanent hair-waving composition comprising tetramethylguadinine ...La première réaction consiste en une bêta-élimination sur la cystine ... qui a été libéré pour former une nouvelle liaison appelée pont ou liaison ou résidu ...
www.freepatentsonline.com/EP1532962.html - 43k


Francis MARC
Lithuania
Local time: 23:25
Native speaker of: Native in FrenchFrench
PRO pts in category: 182
Grading comment
merci
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8 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5
pas de nouvelle liaison cystine


Explanation:
La première réaction consiste en une bêta-élimination sur la cystine ... pour former une nouvelle liaison appelée pont ou liaison ou résidu lanthionine. ...
www.freepatentsonline.com/EP1532962.html - 43k -

Drmanu49
France
Local time: 22:25
Works in field
Native speaker of: Native in EnglishEnglish, Native in FrenchFrench
PRO pts in category: 277
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3 hrs   confidence: Answerer confidence 3/5Answerer confidence 3/5
la cystine ne peut pas être reformée


Explanation:
La page française n'a pas de diagramme, donc:

http://en.wikipedia.org/wiki/Cystine

Je pense qu'avec la cassure de la liaison, la molécule de cystine n'existe plus (IMHO).

LM Loh
France
Local time: 22:25
Native speaker of: Native in EnglishEnglish
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