FT-IR Spectroscopic Characterization of NADH:Ubiquinone Oxidoreductase (Complex I) fromEscherichia coli:  Oxidation of FeS Cluster N2 is Coupled with the Protonation of an Aspartate or Glutamate Side Chain†

Biochemistry ◽  
2000 ◽  
Vol 39 (35) ◽  
pp. 10884-10891 ◽  
Author(s):  
Petra Hellwig ◽  
Dierk Scheide ◽  
Stefanie Bungert ◽  
Werner Mäntele ◽  
Thorsten Friedrich
Keyword(s):  
Complex I ◽  
Spectroscopic Characterization ◽  
Side Chain ◽  
Nadh:Ubiquinone Oxidoreductase ◽  
Fromescherichia Coli ◽  
Ft Ir ◽  
Ir Spectroscopic

Structural and IR-spectroscopic characterization of pyridinium acesulfamate, a monoclinic twin

2018 ◽  
Vol 73 (11) ◽  
pp. 753-758
Author(s):  
Enrique J. Baran ◽  
Oscar E. Piro ◽  
Gustavo A. Echeverría ◽  
Beatriz S. Parajón-Costa
Keyword(s):  
Crystal Structure ◽  
Spectroscopic Characterization ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pyridinium Cation ◽  
Ft Ir ◽  
The Fourier Transform ◽  
Ir Spectroscopic

AbstractThe crystal structure of pyridinium 6-methyl-1,2,3,-oxathiazine-4(3H)-one-2,2-dioxide [(C5NH6)(C4H4NO4S)], for short, pyH(ace), was determined by X-ray diffraction methods. It crystallizes as a twin in the monoclinic space group P21/c with a=6.9878(9), b=7.2211(7), c=21.740(2) Å, β=91.67(1)° and Z=4 molecules per unit cell. The structure was determined employing 1599 reflections with I>2σ(I) from one of the twin domains and refined employing 2092 reflections from both crystal domains to an agreement R1 factor of 0.0466. Besides electrostatic attractions, intermolecular pyH···O=C(ace) hydrogen bonds stabilize the acesulfamate anion and the pyridinium cation into planar discrete units parallel to the (100) crystal plane. The units form stacks of alternating ace− and pyH+ ions along the a axis that favors inter-ring π–π interactions. The Fourier transform-infrared (FT-IR) spectrum of the compound was recorded and is briefly discussed. Some comparisons with related pyridinium saccharinate salts are also made.

Spectral Investigation on the Growth and Characterization of NLO Crystals of Thiourea Succinic Acid Single Crystal.

2015 ◽  
Vol 2 (2) ◽  
pp. 70-73
Author(s):  
Kannan.P ◽  
Thambidurai.S ◽  
Suresh.N
Keyword(s):  
Single Crystal ◽  
Succinic Acid ◽  
Slow Evaporation Technique ◽  
Absorption Studies ◽  
Dta Analysis ◽  
Evaporation Technique ◽  
Ft Ir ◽  
Ir Spectroscopic ◽  
Thermal Stability Of

Growth of optically transparent single crystals of thiourea succinic acid (TUSA) was grown successfully from aqueous solution by slow evaporation technique. The crystal structure was elucidated using the single crystal XRD. The various functional groups and the modes of vibrations were identified by FT-IR spectroscopic analysis. The optical absorption studies indicate that the optical transparency window is quite wide making its suitable for NLO applications. Thermal stability of the crown crystal carried out by TGA-DTA analysis.

Mutants of Chlamydomonas reinhardtii Deficient in Mitochondrial Complex I: Characterization of Two Mutations Affecting the nd1 Coding Sequence

Genetics ◽  
2001 ◽  
Vol 158 (3) ◽  
pp. 1051-1060
Author(s):  
Claire Remacle ◽  
Denis Baurain ◽  
Pierre Cardol ◽  
René F Matagne
Keyword(s):  
Mitochondrial Genome ◽  
Chlamydomonas Reinhardtii ◽  
Complex I ◽  
Slow Growth ◽  
Nadh:Ubiquinone Oxidoreductase ◽  
Sequencing Analysis ◽  
Mitochondrial Complex ◽  
Genetical Analysis ◽  
Complex I Activity

Abstract The mitochondrial rotenone-sensitive NADH:ubiquinone oxidoreductase (complex I) comprises more than 30 subunits, the majority of which are encoded by the nucleus. In Chlamydomonas reinhardtii, only five components of complex I are coded for by mitochondrial genes. Three mutants deprived of complex I activity and displaying slow growth in the dark were isolated after mutagenic treatment with acriflavine. A genetical analysis demonstrated that two mutations (dum20 and dum25) affect the mitochondrial genome whereas the third mutation (dn26) is of nuclear origin. Recombinational analyses showed that dum20 and dum25 are closely linked on the genetic map of the mitochondrial genome and could affect the nd1 gene. A sequencing analysis confirmed this conclusion: dum20 is a deletion of one T at codon 243 of nd1; dum25 corresponds to a 6-bp deletion that eliminates two amino acids located in a very conserved hydrophilic segment of the protein.

FT-IR and micro-Raman spectroscopic characterization of minerals in high-calcium coal ashes

2018 ◽  
Vol 91 (3) ◽  
pp. 389-396 ◽  
Author(s):  
Yanshan Yin ◽  
Jie Yin ◽  
Wei Zhang ◽  
Hong Tian ◽  
Zhangmao Hu ◽  
...  
Keyword(s):  
Spectroscopic Characterization ◽  
Raman Spectroscopic ◽  
High Calcium ◽  
Ft Ir ◽  
Coal Ashes
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