scholarly journals Characterization of Goldfish Scales by Vibrational Spectroscopic Analyses

2018 ◽  
pp. 55-61
Author(s):  
Masayuki Nara ◽  
Yusuke Maruyama ◽  
Atsuhiko Hattori
Keyword(s):  
Spectroscopic Analyses

Structural characterization of C–S–H and C–A–S–H samples—Part II: Local environment investigated by spectroscopic analyses

2009 ◽  
Vol 182 (12) ◽  
pp. 3320-3329 ◽  
Author(s):  
Guillaume Renaudin ◽  
Julie Russias ◽  
Fabrice Leroux ◽  
Céline Cau-dit-Coumes ◽  
Fabien Frizon
Keyword(s):  
Structural Characterization ◽  
Local Environment ◽  
Spectroscopic Analyses

Crystallographic and spectroscopic characterization of a mixed actinide–lanthanide carbide cluster stabilized inside an Ih(7)-C80 fullerene cage

2020 ◽  
Vol 56 (27) ◽  
pp. 3867-3870 ◽  
Author(s):  
Xiaomeng Li ◽  
Yang-Rong Yao ◽  
Wei Yang ◽  
Jiaxin Zhuang ◽  
Luis Echegoyen ◽  
...  
Keyword(s):  
Spectroscopic Characterization ◽  
Fullerene Cage ◽  
Spectroscopic Analyses ◽  
Carbide Cluster ◽  
First Time

For the first time, crystallographic and spectroscopic analyses identified that a mixed actinide–lanthanide carbide cluster Sc2UC, with a very short UC bond, is stabilized inside an Ih(7)-C80 cage.

scholarly journals Secondary metabolites of Phlebopus species from Northern Thailand

2020 ◽  
Vol 19 (12) ◽  
pp. 1525-1536
Author(s):  
Boontiya Chuankid ◽  
Hedda Schrey ◽  
Benjarong Thongbai ◽  
Olivier Raspé ◽  
Norbert Arnold ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
2D Nmr ◽  
Cytotoxic Activities ◽  
Tumor Cell Lines ◽  
Submerged Cultures ◽  
Esi Ms ◽  
Spectroscopic Analyses ◽  
New Compounds ◽  
Comprehensive Characterization

AbstractSubmerged cultures of the edible mushrooms Phlebopus portentosus and Phlebopus spongiosus were screened for their secondary metabolites by HPLC-UV/Vis and HR-LC-ESI-MS. Two new compounds, 9′-hydroxyphenyl pulvinone (1), containing an unusual pulvinone structure, and phlebopyron (2), together with the seven known pigments, atromentic acid (3), xerocomic acid (4), variegatic acid (5), methyl atromentate (6), methyl isoxerocomate (7), methyl variegatate (8), and variegatorubin (9) were isolated from the cultures. Their structures were assigned on the basis of extensive 1D/2D NMR spectroscopic analyses, as well as HR-ESI-MS, and HR-ESI-MS/MS measurements. Furthermore, the isolated compounds were evaluated for their antimicrobial and cytotoxic properties. 9′-hydroxyphenyl pulvinone (1), xerocomic acid (4), and methyl variegatate (8) exhibited weak to moderate cytotoxic activities against several tumor cell lines. The present paper provides a comprehensive characterization of pigments from the class of pulvinic acids that are present in the basidiomes of many edible bolete species.

scholarly journals Photoreversible interconversion of a phytochrome photosensory module in the crystalline state

2019 ◽  
Vol 117 (1) ◽  
pp. 300-307 ◽  
Author(s):  
E. Sethe Burgie ◽  
Jonathan A. Clinger ◽  
Mitchell D. Miller ◽  
Aaron S. Brewster ◽  
Pierre Aller ◽  
...  
Keyword(s):  
Single Crystal ◽  
Blue Light ◽  
Green Light ◽  
Crystallographic Structure ◽  
X Ray Diffraction ◽  
Major Barrier ◽  
X Ray ◽  
Spectroscopic Analyses ◽  
Serial Femtosecond Crystallography

A major barrier to defining the structural intermediates that arise during the reversible photointerconversion of phytochromes between their biologically inactive and active states has been the lack of crystals that faithfully undergo this transition within the crystal lattice. Here, we describe a crystalline form of the cyclic GMP phosphodiesterases/adenylyl cyclase/FhlA (GAF) domain from the cyanobacteriochrome PixJ inThermosynechococcus elongatusassembled with phycocyanobilin that permits reversible photoconversion between the blue light-absorbing Pb and green light-absorbing Pg states, as well as thermal reversion of Pg back to Pb. The X-ray crystallographic structure of Pb matches previous models, including autocatalytic conversion of phycocyanobilin to phycoviolobilin upon binding and its tandem thioether linkage to the GAF domain. Cryocrystallography at 150 K, which compared diffraction data from a single crystal as Pb or after irradiation with blue light, detected photoconversion product(s) based on Fobs− Fobsdifference maps that were consistent with rotation of the bonds connecting pyrrole rings C and D. Further spectroscopic analyses showed that phycoviolobilin is susceptible to X-ray radiation damage, especially as Pg, during single-crystal X-ray diffraction analyses, which could complicate fine mapping of the various intermediate states. Fortunately, we found that PixJ crystals are amenable to serial femtosecond crystallography (SFX) analyses using X-ray free-electron lasers (XFELs). As proof of principle, we solved by room temperature SFX the GAF domain structure of Pb to 1.55-Å resolution, which was strongly congruent with synchrotron-based models. Analysis of these crystals by SFX should now enable structural characterization of the early events that drive phytochrome photoconversion.

scholarly journals Accurate Fundamental Stellar Parameters

2009 ◽  
Vol 5 (S265) ◽  
pp. 215-216
Author(s):  
Hans Bruntt
Keyword(s):  
Spectral Type ◽  
Effective Temperature ◽  
Direct Methods ◽  
Space Missions ◽  
Indirect Methods ◽  
Fundamental Parameters ◽  
Spectroscopic Analyses ◽  
Solar Type ◽  
Fundamental Stellar Parameters

AbstractWe combine results from interferometry, asteroseismology and spectroscopic analyses to determine accurate fundamental parameters (mass, radius and effective temperature) of 10 bright solar-type stars covering the H-R diagram from spectral type F5 to K1. Using “direct” techniques that are only weakly model-dependent we determine the mass, radius and effective temperature. We demonstrate that model-dependent or “indirect” methods can be reliably used even for relatively faint single stars for which direct methods are not applicable. This is important for the characterization of the targets of the CoRoT and Kepler space missions.

scholarly journals Monitoring and characterization of compost obtained of sludge of ultra-processed food industry by conventional and spectroscopic analyses

2019 ◽  
Vol 40 (1) ◽  
pp. 39 ◽  
Author(s):  
Cleber Pinto da Silva ◽  
Bruna Pompermayer Meotti de Almeida ◽  
Sandro Xavier de Campos
Keyword(s):  
Food Industry ◽  
Processed Food ◽  
Spectroscopic Analyses

A compostagem de lodo da indústria de alimentos ultra processados em pilhas foi avaliada através de parâmetros físico-químicos, fitotóxicos e espectroscópicos. As pilhas apresentaram fase termofílica por aproximadamente duas semanas. Após 90 dias, o índice de germinação de sementes (IGS) atingiu valores de 62.5% para a pilha 1 e 87.5% para a pilha 2. As análises espectroscópicas revelaram a degradação de estruturas alifáticas / polissacarídicas e o aumento de grupos funcionais oxigenados presentes nos ácidos húmicos. As concentrações de íons metálicos estavam abaixo do valor máximo permitido pela legislação atual. O processo de compostagem em pilhas foi eficiente para degradar o lodo da indústria de alimentos ultra processados, associado à poda de jardim ou serragem, resultando em compostos maduros.

SYNTHESIS AND CHARACTERIZATION OF MICROPOROUS SILICA-ALUMINA THIN FILMS

2010 ◽  
Vol 09 (06) ◽  
pp. 571-574
Author(s):  
CHERAITIA ABDALLAH ◽  
SATHA HAMID ◽  
AYRAL ANDRÉ
Keyword(s):  
Thin Films ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Dip Coating ◽  
Microporous Silica ◽  
Molar Ratios ◽  
Spectroscopic Analyses ◽  
Silica Alumina ◽  
Acidic Alumina

Microporous silica-alumina thin films were prepared by a simple and robust sol-gel method. Tetraethoxysilane was mixed with an acidic alumina hydrosol. Urea was added for the preparation of the alumina hydrosol, for controlling the polycondensation of the mixed oxide network and also as porogen agent. Thin films were deposited by dip-coating on dense substrates. IR and 27 Al NMR spectroscopic analyses showed that for Si/Al molar ratios up to 6/1, a homogeneous mixed oxide is obtained with a random distribution of Al and Si atoms in the oxide lattice based on tetrahedral units. The deposited layers are crack-free as demonstrated by scanning electron microscopy (SEM) observations. Their microporosity was investigated using ellipsoporosimetry (EP) with films supported on flat substrates.

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