Characterization of the Binding of Deuteroporphyrin IX to the Magnesium Chelatase H Subunit and Spectroscopic Properties of the Complex†

Biochemistry ◽  
2001 ◽  
Vol 40 (31) ◽  
pp. 9291-9299 ◽  
Author(s):  
Guy A. Karger ◽  
James D. Reid ◽  
C. Neil Hunter
Keyword(s):  
Spectroscopic Properties ◽  
Magnesium Chelatase

New insights into the protogenic and spectroscopic properties of commercial tannic acid: the role of gallic acid impurities

2018 ◽  
Vol 42 (10) ◽  
pp. 7703-7712 ◽  
Author(s):  
G. Ghigo ◽  
S. Berto ◽  
M. Minella ◽  
D. Vione ◽  
E. Alladio ◽  
...  
Keyword(s):  
Gallic Acid ◽  
Tannic Acid ◽  
Spectroscopic Properties ◽  
Spectral Features

Assessment of a protonation model for tannic acid and characterization of the spectral features of its protonated and dissociated species.

XANES Characterization of Ce Valence State in Polycrystalline Lu2SiO5∶Ce Powders and Its VUV Spectroscopic Properties

2014 ◽  
Vol 35 (9) ◽  
pp. 1027-1033
Author(s):  
范灵聪 FAN Ling-cong ◽  
张瑜瑜 ZHANG Yu-yu ◽  
张园 ZHNAG Yuan ◽  
施鹰 SHI Ying ◽  
谢建军 XIE Jian-jun ◽  
...  
Keyword(s):  
Valence State ◽  
Spectroscopic Properties

An in depth characterization of the spectroscopic properties and laser action of 10 at% Yb doped Y3ScxAl5-xO12 (x = 0.25, 0.5, 1.0, 1.5) transparent ceramics

2020 ◽  
Vol 46 (11) ◽  
pp. 17252-17260 ◽  
Author(s):  
Guido Toci ◽  
Angela Pirri ◽  
Barbara Patrizi ◽  
Yagang Feng ◽  
Tengfei Xie ◽  
...  
Keyword(s):  
Laser Action ◽  
Spectroscopic Properties ◽  
Transparent Ceramics

Synthesis and Characterization of Chiral Conducting Polymers Based on Polypyrrole

1997 ◽  
Vol 50 (9) ◽  
pp. 939 ◽  
Author(s):  
Fang Chen ◽  
Parveen Akhtar ◽  
Leon A. P. Kane-Maguire ◽  
Gordon G. Wallace
Keyword(s):  
Conducting Polymers ◽  
Propionic Acid ◽  
Spectroscopic Properties ◽  
Optically Active ◽  
Synthesis And Characterization ◽  
Chiroptical Properties ◽  
Covalently Bonded ◽  
Circular Dichroïsm ◽  
Ring Position

A range of optically active pyrrole monomers have been synthesized in which a chiral sub- stituent is covalently bonded either to the pyrrole N or C3 ring position, namely (–)-(1R)-4-methyl-N-(1-phenylethyl)pyrrole-3-carboxamide, (+)-(1S)-4-methyl-N-(1-phenylethyl)pyrrole-3-carboxamide, (–)-(1R)-4-methyl-N-(1-naphthylethyl)pyrrole-3-carboxamide, (+)-(1S)-4-methyl-N-(1-naphthylethyl)pyrrole-3-carboxamide, (+)-(2S)-2-(1H-pyrrol-1-yl)propionic acid, (+)-(1S)-N-(1-phenyl-ethyl)pyrrole, and (–)-(1R)-N-(1-phenylethyl)pyrrole. Their chiroptical properties have been established by circular dichroism spectroscopy. Electropolymerization of the three N-substituted pyrrole monomers provided films of chiral conducting polymers, whose electrical and spectroscopic properties are described. Although oxidation of the C3 substituted pyrrole monomers was also facile, electrodeposition was poor and films of the associated polymers could not be obtained.

Synthesis and Characterization of Novel Gold(III) Complexes of Asymmetrically Aryl-Substituted 1,2-Dithiolene Ligands Featuring Potential-Controlled Spectroscopic Properties

2010 ◽  
pp. n/a-n/a ◽  
Author(s):  
Lucia Ambrosio ◽  
M. Carla Aragoni ◽  
Massimiliano Arca ◽  
Francesco A. Devillanova ◽  
Michael B. Hursthouse ◽  
...  
Keyword(s):  
Spectroscopic Properties ◽  
Synthesis And Characterization

Preparation and Characterization of a Novel Gadolinium Triple-Decker Sandwich-Type Complex with Tetrabenzoporphyrin Ligand

2013 ◽  
Vol 690-693 ◽  
pp. 573-576
Author(s):  
Qi Feng Liu
Keyword(s):  
Room Temperature ◽  
Spectroscopic Properties ◽  
Magnetic Interactions ◽  
Antiferromagnetic Coupling ◽  
Magnetic Studies ◽  
Conjugated Systems ◽  
Type Complex ◽  
Vis Spectroscopy ◽  
Sandwich Type

A novel gadolinium triple-decker sandwich-type complex containing tetrabenzoporphyrin (TBP) ligands-Gd (TBP)3was prepared from porphyrin 1 and Gd (acac)3.nH2O in boiling 1, 2, 4-Tcb for 45~48 h under Ar. Its structure is characterized by Uv-Vis spectroscopy and HR-MS. The spectroscopic properties show that its longest-wavelength visible band (600-800 nm) is obviously red-shifted due to the extension of the π conjugated systems derived from the linear benzoannulation in the TBP ring. The magnetic studies also indicate that there is no magnetic interactions between two Gd (III) ions in the triple-deckers in the range from room temperature down to 20K and very weak antiferromagnetic coupling exists between two Gd (III) ions below 20K.

Ancestral protein reconstruction: techniques and applications

2016 ◽  
Vol 397 (1) ◽  
pp. 1-21 ◽  
Author(s):  
Rainer Merkl ◽  
Reinhard Sterner
Keyword(s):  
Protein Function ◽  
Steroid Receptors ◽  
Protein Complexes ◽  
Spectroscopic Properties ◽  
Gene Duplications ◽  
Amino Acid Residues ◽  
Basic Principles ◽  
Sequence Reconstruction ◽  
Ancestral Protein

Abstract Ancestral sequence reconstruction (ASR) is the calculation of ancient protein sequences on the basis of extant ones. It is most powerful in combination with the experimental characterization of the corresponding proteins. Such analyses allow for the study of problems that are otherwise intractable. For example, ASR has been used to characterize ancestral enzymes dating back to the Paleoarchean era and to deduce properties of the corresponding habitats. In addition, the historical approach underlying ASR enables the identification of amino acid residues key to protein function, which is often not possible by only comparing extant proteins. Along these lines, residues responsible for the spectroscopic properties of protein pigments were identified as well as residues determining the binding specificity of steroid receptors. Further applications are studies related to the longevity of mutations, the contribution of gene duplications to enzyme functionalization, and the evolution of protein complexes. For these applications of ASR, we discuss recent examples; moreover, we introduce the basic principles of the underlying algorithms and present state-of-the-art protocols.

scholarly journals Darstellung und Charakterisierung einfacher α-Sila- und α,ω-Disilaalkane als Vorstufen für die CVD-Erzeugung von amorphem Silicium a-SiC:H / Synthesis and Characterization of Simple α-Sila- and α,ω-Disilaalkanes: Precursors for the CVD Production of Amorphous Silicon a-SiC:H

1987 ◽  
Vol 42 (9) ◽  
pp. 1088-1096 ◽  
Author(s):  
Hubert Schmidbaur ◽  
Cornelia Dörzbach
Keyword(s):  
Amorphous Silicon ◽  
Spectroscopic Properties ◽  
High Yield ◽  
Synthesis And Characterization ◽  
Nmr Data ◽  
Functional Derivatives ◽  
New Compounds

Preparative methods have been explored for the synthesis of small, volatile polysilaalkanes, which could serve as starting materials for the production of amorphous silicon a-SiC:H. High yield pathways have been developed for H3SiCH2CH2SiH3 and H3SiCH2CH2CH2SiH3. These compounds can be converted into symmetrically halogen-functional derivatives through the reac­tions with SnCl4 or Br2. The homologous H3SiCH2CH2SiH2CH3 has also been prepared and halogenated, starting from the corresponding vinylsilane via the hydrosilylation route. Allylsilanes were the source of the synthesis of H3SiCH2CH=CH2, CH3SiH2CH2CH=CH, SiH2(CH2CH = CH2)2, SiH2(CH2CH2CH2SiH3)2, or HSi(CH2CH2CH2SiH3)3. Methylated deriva­tives are also available. - Some physical and spectroscopic properties of the new compounds have been investigated. In particular. NMR data were collected and used for an assessment of structure and isomerism.

Characterization of the magnesium chelatase from Thermosynechococcus elongatus

2013 ◽  
Vol 457 (1) ◽  
pp. 163-170 ◽  
Author(s):  
Nathan B. P. Adams ◽  
Christopher J. Marklew ◽  
Amanda A. Brindley ◽  
C. Neil Hunter ◽  
James D. Reid
Keyword(s):  
Chlorophyll Biosynthesis ◽  
Thermostable Enzyme ◽  
Enzyme Complex ◽  
Magnesium Chelatase

Magnesium chelatase is the ‘gatekeeper’ multi-subunit enzyme complex that initiates chlorophyll biosynthesis; we present the first characterization of an active thermostable enzyme complex and we use hybrid mesophilic/thermophilic chelatase complexes to reveal that Mg2+ co-operativity resides in the ChlD subunit.

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