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Wyszukujesz frazę ""RACEMIZATION"" wg kryterium: Temat


Tytuł :
Local and Global Chirality Measures of Natural Amino Acids
Index Terms :
Chirality of Electron Density Clouds
Chirality Measures
L-to-D Transformations of Amino Acids
Aspartic Acid Racemization and Cataract Formation
The Role of Chiral Surroundings in Racemization
494.9
Departmental Bulletin Paper
URL :
http://hdl.handle.net/2433/225148">http://hdl.handle.net/2433/225148
http://www2.yukawa.kyoto-u.ac.jp/~future/icis">http://www2.yukawa.kyoto-u.ac.jp/~future/icis
Zasób elektroniczny
Tytuł :
Aspartic acid racemization rate in narwhal (Monodon monoceros) eye lens nuclei estimated by counting of growth layers in tusks
Index Terms :
Ages of marine mammals have traditionally been estimated by counting dentinal growth layers in teeth. However, this method is difficult to use on narwhals (Monodon monoceros) because of their special tooth structures. Alternative methods are therefore needed. The aspartic acid racemization (AAR) technique has been used in age estimation studies of cetaceans, including narwhals. The purpose of this study was to estimate a species-specific racemization rate for narwhals by regressing aspartic acid D/L ratios in eye lens nuclei against growth layer groups in tusks (n=9). Two racemization rates were estimated: one by linear regression (r2=0.98) based on the assumption that age was known without error, and one based on a bootstrap study, taking into account the uncertainty in the age estimation (r2 between 0.88 and 0.98). The two estimated 2kAsp values were identical up to two significant figures. The 2kAsp value from the bootstrap study was found to be 0.00229±0.000089 SE, which corresponds to a racemization rateof 0.00114-yr±0.000044 SE. The intercept of 0.0580±0.00185 SE corresponds to twice the (D/L)0 value, which is then 0.0290±0.00093 SE. We propose that this species-specific racemization rate and (D/L)0 value be used in future AAR age estimation studies of narwhals, but also recommend the collection of tusks and eyes of narwhals for further improving the (D/L)0 and 2kAsp estimates obtained in this study.
URL :
http://curis.ku.dk/portal/da/publications/aspartic-acid-racemization-rate-in-narwhal-monodon-monoceros-eye-lens-nuclei-estimated-by-counting-of-growth-layers-in-tusks(9139dd66-aaae-4154-ac5f-389bfc1bf4a4).html">http://curis.ku.dk/portal/da/publications/aspartic-acid-racemization-rate-in-narwhal-monodon-monoceros-eye-lens-nuclei-estimated-by-counting-of-growth-layers-in-tusks(9139dd66-aaae-4154-ac5f-389bfc1bf4a4).html
http://curis.ku.dk/ws/files/41890379/PolarResearch2012Ditlevsen_etal.pdf">http://curis.ku.dk/ws/files/41890379/PolarResearch2012Ditlevsen_etal.pdf
Zasób elektroniczny
Tytuł :
Dynamic kinetic resolution process employing haloalkane dehalogenase
Index Terms :
dynamic kinetic resolution
enantioselective biocatalysis
haloalkane dehalogenases
alpha-hydroxyamides
racemization methods
CHEMOENZYMATIC SYNTHESIS
ALPHA-HYDROXYAMIDES
RACEMIZATION
RUTHENIUM
ALCOHOLS
ENZYME
ENANTIOSELECTIVITY
HYDROGENATION
COMPLEX
KETONES
article
URL :
http://dx.doi.org/10.1021/cs2003565">http://dx.doi.org/10.1021/cs2003565
http://hdl.handle.net/11370/07471e1c-9b1f-4d85-a0f8-b0ab10f4ca60">http://hdl.handle.net/11370/07471e1c-9b1f-4d85-a0f8-b0ab10f4ca60
Zasób elektroniczny
Tytuł :
Heterogeneous catalysis in racemization and kinetic resolution along a journey in protein engineering
Index Terms :
racemization
protein engineering
kinetic resolution
heterogeneous catalysis
biohybrid catalyst
Organic Chemistry
Organisk kemi
Doctoral thesis, comprehensive summary
info:eu-repo/semantics/doctoralThesis
text
URL :
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-153921">http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-153921
Zasób elektroniczny
Tytuł :
Chemoenzymatic Dynamic Kinetic Resolution of Secondary Alcohols Using an Air- and Moisture-Stable Iron Racemization Catalyst
Index Terms :
dynamic kinetic resolution
enzyme catalysis
iron catalysis
racemization
secondary alcohols
Chemical Sciences
Kemi
Article in journal
info:eu-repo/semantics/article
text
URL :
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-141286">http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-141286
Chemistry - A European Journal, 0947-6539, 2017, 23:5, s. 1048-1051
Zasób elektroniczny
Tytuł :
Synthesis of Chiral TFA-Protected α-Amino Aryl-Ketone Derivatives with Friedel–Crafts Acylation of α-Amino Acid N-Hydroxysuccinimide Ester
Index Terms :
N-hydroxysuccinimide ester
Friedel-Crafts acylation
alpha-amino acid
alpha-amino aryl-ketone
racemization
464
article
URL :
http://hdl.handle.net/2115/68009">http://hdl.handle.net/2115/68009
http://dx.doi.org/10.3390/molecules22101748">http://dx.doi.org/10.3390/molecules22101748
Zasób elektroniczny
Tytuł :
Highly enantioselective synthesis of N,N-dialkylbenzamides with aryl-carbonyl axial chirality by rhodium-catalyzed [2 + 2 + 2] cycloaddition.
Index Terms :
dialkylalkynylamide prepn diyne rhodium chiral segphos binap enantioselective cycloaddn
fused dialkylcarbamoyl indane benzofuran isoindole stereoselective prepn racemization
enantioselective cycloaddn catalyst rhodium chiral segphos binap
Journal Article
Tytuły dodatkowe :
Highly enantioselective synthesis of N,N-dialkylbenzamides with aryl-carbonyl axial chirality by rhodium-catalyzed [2 + 2 + 2] cycloaddition.
Highly enantioselective synthesis of N,N-dialkylbenzamides with aryl-carbonyl axial chirality by rhodium-catalyzed [2 + 2 + 2] cycloaddition.
URL :
http://jairo.nii.ac.jp/0083/00222528">http://jairo.nii.ac.jp/0083/00222528
10.1002/chem.200800953
Zasób elektroniczny

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