Identification and structural characterization of a transient radical species in the uricase reaction mechanism

2007 ◽  
Vol 31 (3-4) ◽  
pp. 471-482 ◽  
Author(s):  
E. Busi ◽  
A. Sinicropi ◽  
L. Terzuoli ◽  
E. Marinello ◽  
R. Basosi
Keyword(s):  
Reaction Mechanism ◽  
Structural Characterization ◽  
Radical Species

Synthesis and Structural Characterization of Rigid Rod-Like Unsubstituted Quinoline Oligomers

1988 ◽  
Vol 134 ◽  
Author(s):  
Long Y. Chiang ◽  
Rodney V. Kastrup ◽  
Chang S. Hsu ◽  
John W. Swirczewski
Keyword(s):  
Molecular Weight ◽  
Reaction Mechanism ◽  
Structural Characterization ◽  
Spectroscopic Data ◽  
Bulk Material ◽  
Condensation Reaction ◽  
X Ray ◽  
Rigid Rod ◽  
Crystal Structural

ABSTRACTThe structure of quinoline oligomers synthesized by the catalytic dehydrogenative condensation reaction of 1,2,3,4-tetrahydroquinoline was elucidated on the basis of various spectroscopic data including the 2D COSY 1H NMR. The x-ray crystal structural study of two quinoline dimers successfully isolated from the bulk material resolved the puzzle of ring conjunction positions between quinoline units of the oligomer product. A reaction mechanism is proposed. From this mechanism a delicate balance between dehydrogenation and polymerization activity of the catalyst is required to optimize the yield and the molecular weight of the product.

New ultrastructural findings about Borrelia burgdorferi by cryofixation, negative staining, thin sectioning and scanning techniques

1990 ◽  
Vol 48 (3) ◽  
pp. 582-583
Author(s):  
S. F. Hayes ◽  
M. D. Corwin ◽  
T. G. Schwan ◽  
D. W. Dorward ◽  
W. Burgdorfer
Keyword(s):  
Lyme Disease ◽  
Borrelia Burgdorferi ◽  
Structural Characterization ◽  
Negative Staining ◽  
Low Speed ◽  
Thin Sectioning ◽  
Ultrastructural Findings

Characterization of Borrelia burgdorferi strains by means of negative staining EM has become an integral part of many studies related to the biology of the Lyme disease organism. However, relying solely upon negative staining to compare new isolates with prototype B31 or other borreliae is often unsatisfactory. To obtain more satisfactory results, we have relied upon a correlative approach encompassing a variety EM techniques, i.e., scanning for topographical features and cryotomy, negative staining and thin sectioning to provide a more complete structural characterization of B. burgdorferi.For characterization, isolates of B. burgdorferi were cultured in BSK II media from which they were removed by low speed centrifugation. The sedimented borrelia were carefully resuspended in stabilizing buffer so as to preserve their features for scanning and negative staining. Alternatively, others were prepared for conventional thin sectioning and for cryotomy using modified procedures. For thin sectioning, the fixative described by Ito, et al.

Structural characterization of the PPIase domain of FKBP51, a cochaperone of human Hsp90

2011 ◽  
Vol 44 (06) ◽  
Author(s):  
A Bracher ◽  
C Kozany ◽  
AK Thost ◽  
F Hausch
Keyword(s):  
Structural Characterization ◽  
Ppiase Domain

Structural characterization of dendrobine-type sesquiterpene alkaloids from the stems of Dendrobium nobile using LC-MS/MS

Planta Medica ◽  
2014 ◽  
Vol 80 (10) ◽  
Author(s):  
YH Wang ◽  
B Avula ◽  
N Abe ◽  
F Wei ◽  
M Wang ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Dendrobium Nobile

Structural characterization of monacolin compounds from red yeast rice by liquid chromatography and tandem mass

Planta Medica ◽  
2015 ◽  
Vol 81 (11) ◽  
Author(s):  
YH Wang ◽  
B Avula ◽  
Z Zhang ◽  
M Wang ◽  
S Sagi ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Structural Characterization ◽  
Red Yeast Rice ◽  
Tandem Mass ◽  
Red Yeast
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