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20231223052956.0 |
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231223s2004 xx ||||| 00| ||eng c |
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|a pubmed24n0500.xml
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|a (DE-627)NLM150025785
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|a (NLM)15323500
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Fleming, Gary J
|e verfasserin
|4 aut
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| 245 |
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|a Probing the reaction pathways of DL-proline on TiO2 (001) single crystal surfaces
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|c 2004
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 10.03.2006
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|a Date Revised 24.11.2016
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|a published: Print
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|a Citation Status MEDLINE
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|a The reaction of DL-Proline on O2-annealed (stoichiometric) and O-defected (sub-stoichiometric) TiO2 (001) single-crystal surfaces has been investigated. This is of significance in trying to understand the concept of how biomolecules interact with the surfaces of biomedical implants (molecular recognition). On an O2-annealed TiO2 surface, proline is found to largely adsorb then desorb intact at approximately 350 K. DFT (B3LYP) calculations of proline bound to a Ti(OH)4 cluster suggest a binding through the carboxylate functional group rather than through the NH group of the ring. In contrast, proline reaction was considerably different on the O-defected surface. First, proline was further stabilized, evidenced by a shift of its desorption temperature (during temperature-programmed desorption) to approximately 530 K. Along with proline desorption, two distinctive sets of reaction processes occurred at 530 and 630 K, respectively. The first pathway (alpha) at 530 K shows desorption of large amounts of m/e 55 (attributed to 1-azetine) and m/e 42 (attributed to ketene). At still higher temperature, 630 K, a pathway (beta) dominated by the appearance of low masses, mainly m/e 28, 27, and 26, is seen. These masses are tentatively attributed to desorption of HCN, ethylene, and/or acetylene as they represent the logical further decomposition of the different fragments of proline
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|a Journal Article
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7 |
|a Azetines
|2 NLM
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|a Biocompatible Materials
|2 NLM
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7 |
|a Ethylenes
|2 NLM
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7 |
|a Ketones
|2 NLM
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|a titanium dioxide
|2 NLM
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|a 15FIX9V2JP
|2 NLM
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|a Hydrogen Cyanide
|2 NLM
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|a 2WTB3V159F
|2 NLM
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|a ethylene
|2 NLM
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|a 91GW059KN7
|2 NLM
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|a Proline
|2 NLM
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|a 9DLQ4CIU6V
|2 NLM
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7 |
|a Titanium
|2 NLM
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|a D1JT611TNE
|2 NLM
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|a ketene
|2 NLM
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|a LEP3SM032A
|2 NLM
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7 |
|a Acetylene
|2 NLM
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7 |
|a OC7TV75O83
|2 NLM
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7 |
|a titanium hydroxide
|2 NLM
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| 650 |
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|a W9EOP89V8G
|2 NLM
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1 |
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|a Idriss, Hicham
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 20(2004), 18 vom: 31. Aug., Seite 7540-6
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:20
|g year:2004
|g number:18
|g day:31
|g month:08
|g pages:7540-6
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|a GBV_USEFLAG_A
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|a AR
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|d 20
|j 2004
|e 18
|b 31
|c 08
|h 7540-6
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