scholarly journals Structure elucidation of the novel carotenoid gemmatoxanthin from the photosynthetic complex of Gemmatimonas phototrophica AP64

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Nupur ◽  
Marek Kuzma ◽  
Jan Hájek ◽  
Pavel Hrouzek ◽  
Alastair T. Gardiner ◽  
...  
Keyword(s):  
Chemical Structure ◽  
The Novel ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
H Nmr ◽  
Infra Red ◽  
Photosynthetic Complexes ◽  
Aldehyde Groups ◽  
First Time ◽  
High Resolution Mass Spectroscopy

AbstractGemmatimonas phototrophica AP64 is the first phototrophic representative of the bacterial phylum Gemmatimonadetes. The cells contain photosynthetic complexes with bacteriochlorophyll a as the main light-harvesting pigment and an unknown carotenoid with a single broad absorption band at 490 nm in methanol. The carotenoid was extracted from isolated photosynthetic complexes, and purified by liquid chromatography. A combination of nuclear magnetic resonance (1H NMR, COSY, 1H-13C HSQC, 1H-13C HMBC, J-resolved, and ROESY), high-resolution mass spectroscopy, Fourier-transformed infra-red, and Raman spectroscopy was used to determine its chemical structure. The novel linear carotenoid, that we have named gemmatoxanthin, contains 11 conjugated double bonds and is further substituted by methoxy, carboxyl and aldehyde groups. Its IUPAC-IUBMB semi-systematic name is 1′-Methoxy-19′-oxo-3′,4′-didehydro-7,8,1′,2′-tetrahydro- Ψ, Ψ carotene-16-oic acid. To our best knowledge, the presence of the carboxyl, methoxy and aldehyde groups on a linear C40 carotenoid backbone is reported here for the first time.

scholarly journals Structure elucidation of the novel carotenoid gemmatoxanthin from the photosynthetic complex of Gemmatimonas phototrophica AP64

2021 ◽  
Author(s):  
Nupur ◽  
Marek Kuzma ◽  
Jan Hájek ◽  
Pavel Hrouzek ◽  
Alastair T. Gardiner ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Light Harvesting ◽  
Aldehyde Group ◽  
The Novel ◽  
Broad Absorption Band ◽  
Infra Red ◽  
Photosynthetic Complexes ◽  
Aldehyde Groups ◽  
First Time ◽  
High Resolution Mass Spectroscopy

Abstract Gemmatimonas phototrophica AP64 is the first phototrophic representative of bacterial phylum Gemmatimonadetes. The cells contain photosynthetic complexes with bacteriochlorophyll a as the main light-harvesting pigment. In addition, the complexes contain a carotenoid with a single broad absorption band at 490 nm in methanol. A combination of nuclear magnetic resonance, high-resolution mass spectroscopy and Fourier-transformed infra-red spectroscopy was used to determine the chemical structure of G. phototrophica light-harvesting carotenoid that we have named gemmatoxanthin. It is a novel linear carotenoid containing 11 conjugated double bonds and further substituted by methoxy, carboxyl and aldehyde group. Its IUPAC-IUBMB semi-systematic name is 1’-Methoxy-19’-oxo-3’,4’-didehydro-7,8,1’,2’-tetrahydro- Ψ, Ψ carotene-16-oic acid. To our best knowledge, the presence of the carboxyl, methoxy and aldehyde groups on a linear C40 carotenoid backbone is reported here for the first time.

Ultra-broad absorption band of Dy3+ doped Gd3Sc2Al3O12 garnet crystal at around 450nm: A potential crystal for InGaN LD pumped all-solid-state yellow lasers

CrystEngComm ◽  
2021 ◽  
Author(s):  
Shoujun Ding ◽  
Hao Ren ◽  
Hongyuan Li ◽  
Wenpeng Liu ◽  
Qingli Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Absorption Band ◽  
Single Crystal ◽  
Czochralski Method ◽  
Spectroscopic Properties ◽  
Garnet Crystal ◽  
High Quality ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
First Time

In this work, a high-quality 2at% Dy3+ doped Gd3Sc2Al3O12 (Dy:GSAG) single crystal was grown successfully by the Czochralski method for the first time. Spectroscopic properties of the crystal were investigated...

scholarly journals Preparation of novel amphoteric polyacrylamide and its synergistic retention with cationic polymers

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 162-170 ◽  
Author(s):  
Kaiji Yang ◽  
Jinghuan Chen ◽  
Qingjin Fu ◽  
Xuji Dun ◽  
Chunli Yao
Keyword(s):  
Molecular Weight ◽  
Chemical Structure ◽  
Guar Gum ◽  
Gel Permeation Chromatography ◽  
The Novel ◽  
Cationic Polymers ◽  
Cationic Starch ◽  
H Nmr ◽  
Gel Permeation ◽  
Scanning Electron

AbstractA novel amphoteric polyacrylamide (PDAA) was prepared by inverse emulsion polymerization. The influence of its cationic degree and molecular weight on retention property was discussed. Then, the chemical structure and micromorphology of the obtained PDAA were characterized by Fourier infrared spectrum (FTIR), NMR hydrogen spectrum (1H NMR), gel permeation chromatography (GPC), and scanning electron microscope (SEM). Finally, the synergistic retention effects of polydimethyldiallylammonium chloride (PDADMAC), cationic starch (CS), cationic guar gum (CHPG), cationic chitosan (CTS), and polyamine (PA) on the novel PDAA were investigated. The results showed that the optimum cationic degree and molecular weight of PDAA were 25% and 4 million, respectively. The chemical structure of PDAA was confirmed by FTIR, 1H NMR, and GPC. SEM showed that the particle size of PDAA was between 150 and 600 nm, and the particles were very stable because no broken particles were found. In addition, most of the five cationic polymers have good synergistic retention effect on PDAA, and the order of synergistic effect was PDAA/PDADMAC > PDAA/CTS > PDAA/CS > PDAA/CHPG > PDAA/PA.

scholarly journals Природа аномальной красной люминесценции в нелинейно-оптических кристаллах K-=SUB=-2-=/SUB=-Al-=SUB=-2-=/SUB=-B-=SUB=-2-=/SUB=-O-=SUB=-7-=/SUB=- : Fe

2019 ◽  
Vol 61 (5) ◽  
pp. 876
Author(s):  
И.Н. Огородников ◽  
В.А. Пустоваров
Keyword(s):  
Fundamental Absorption Edge ◽  
Selective Excitation ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
Nonlinear Optical Crystals ◽  
Intense Luminescence ◽  
Exciton Region ◽  
Wide Gap ◽  
Red Luminescence ◽  
First Time

In this work, the spectra of anomalously intense luminescence at 1.675 eV (FWHM= 0.173 eV) in wide-gap (180–3600 nm) nonlinear-optical crystals K2Al2B2O7 were observed experimentally for the first time upon excitation in the spectral region of 4–5 harmonics of the fundamental frequency of the Nd3+ radiation. Using low-temperature (7–293 K) luminescence-optical spectroscopy with selective excitation by synchrotron radiation, it was shown that red luminescence occurs at intracenter 4T1(4G)→ 6A1(6S) transitions in impurity Fe3+ ions with a concentration less than 2 ppm. The high excitation efficiency in the exciton region is due to the partial overlapping of the fundamental absorption edge of the crystal, where mobile excitons are excited, and the broad absorption band with O– Fe charge transfer with a maximum at 6.5 eV. The spectrum and temperature dependence of the luminescence are due to the superposition of two types of luminescence centers (activation energies 9 and 20 meV) based on Fe3+ impurity ions located in regular Al3+ positions of two nonequivalent Al2O7 clusters.

Metabolites Produced by the Phytopathogenic Fungus Rhizoctonia solani: Isolation, Chemical Structure Determination, Syntheses and Bioactivity

2005 ◽  
Vol 60 (9-10) ◽  
pp. 717-722 ◽  
Author(s):  
M. Soledade C. Pedras ◽  
Yang Yu ◽  
Jun Liu ◽  
Yudelsy A. Tandron-Moya
Keyword(s):  
Biological Activity ◽  
Rhizoctonia Solani ◽  
Structure Determination ◽  
Chemical Structure ◽  
Phytopathogenic Fungus ◽  
H Nmr ◽  
Naturally Occurring ◽  
Chiral Solvating Agent ◽  
First Time ◽  
Absolute Stereochemistry

Abstract The isolation, structure determination, syntheses and biological activity of Nb-acetyltryptamine and three proline containing dioxopiperazines, cyclo(S-Pro-S-Leu) (2), cyclo(S-Pro- S-Ile) (3), and cyclo(S-Pro-S-Val) (4), from cultures of Rhizoctonia solani Kuhn are reported here for the first time. Despite the small amounts isolated, the absolute stereochemistry of these naturally occurring dioxopiperazines was established by 1H NMR using for the first time the chiral solvating agent (R)-(D)-2,2,2-trifluoro-1-(9-anthryl)ethanol.

Synthesis and Characterization of Dendritic Architecture Containing Push-Pull Conjugated Organic Chromophore Possessing Nonlinear Optical Property

2006 ◽  
Vol 937 ◽  
Author(s):  
Jin Joo Choi ◽  
Jong Sun Lim ◽  
Changjin Lee ◽  
Dong Wook Kim
Keyword(s):  
Chemical Structure ◽  
Nonlinear Optical ◽  
Nonlinear Optical Property ◽  
Nitrogen Atmosphere ◽  
Broad Absorption ◽  
Trans Conformation ◽  
Broad Absorption Band ◽  
Electro Optic ◽  
Organic Chromophore

ABSTRACTWe designed and synthesized a dendritic architecture in which three branches of the NLO-active component consisting of push-pull type conjugated structure were linked onto its core. Chemical structure of the dendritic nonlinear optical (NLO) chromophore was verified by NMR spectroscopy, which clearly showed that the conjugated bridge had a trans-conformation. The dendrimer exhibited that the broad absorption band centered at around 608 nm extending to 760 nm. It was thermally stable up to 275 °C in the nitrogen atmosphere. Polymer film was prepared by spincoating the solution of mixture of amorphous polycarbonate (APC) and the dendritic chromophore, which exhibited an electro-optic coefficient of 19 pm/V at 1.55 μm wavelength.

scholarly journals Pre-diagnostic biomarkers of type 2 diabetes identified in the UAE’s obese national population using targeted metabolomics

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Asma M. Fikri ◽  
Rosemary Smyth ◽  
Vijay Kumar ◽  
Zainab Al-Abadla ◽  
Salahedeen Abusnana ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
United Arab Emirates ◽  
Clinical Chemistry ◽  
Predictive Biomarkers ◽  
The Novel ◽  
Global Public Health ◽  
Health Issues ◽  
H Nmr ◽  
First Time

Abstract Currently, type 2 diabetes mellitus (T2DM) and obesity are major global public health issues, and their prevalence in the United Arab Emirates (UAE) are among the highest in the world. In 2019, The UAE diabetes national prevalence was 15.4%. In recent years there has been a considerable investigation of predictive biomarkers associated with these conditions. This study analysed fasting (8 h) blood samples from an obese, normoglycemic cohort and an obese, T2DM cohort of UAE nationals, employing clinical chemistry analysis, 1D 1H NMR and mass spectroscopy (FIA-MS/MS and LC-MS/MS) techniques. The novel findings reported for the first time in a UAE population revealed significant differences in a number of metabolites in the T2DM cohort. Metabolic fingerprints identified by NMR included BCAAs, trimethylamine N-oxide, β-hydroxybutyrate, trimethyl uric acid, and alanine. A targeted MS approach showed significant differences in lysophosphatidylcholines, phosphatidylcholines, acylcarnitine, amino acids and sphingomyelins; Lyso.PC.a.C18.0, PC.ae.C34.2, C3.DC..C4.OH, glutamine and SM.C16.1, being the most significant metabolites. Pearson’s correlation studies showed associations between these metabolites and the clinical chemistry parameters across both cohorts. This report identified differences in metabolites in response to T2DM in agreement with many published population studies. This contributes to the global search for a bank of metabolite biomarkers that can predict the advent of T2DM and give insight to its pathogenic mechanisms.

Buried Narratives: Exhuming the Mother's Story in Oliver Twist

2018 ◽  
Vol 8 (3) ◽  
pp. 247-266
Author(s):  
Michelle L. Wilson
Keyword(s):  
Social Change ◽  
Maternal Inheritance ◽  
The Novel ◽  
Poor Law ◽  
The Family ◽  
The Law ◽  
First Time ◽  
Critical Consideration

Initially, Oliver Twist (1839) might seem representative of the archetypal male social plot, following an orphan and finding him a place by discovering the father and settling the boy within his inheritance. But Agnes Fleming haunts this narrative, undoing its neat, linear transmission. This reconsideration of maternal inheritance and plot in the novel occurs against the backdrop of legal and social change. I extend the critical consideration of the novel's relationship to the New Poor Law by thinking about its reflection on the bastardy clauses. And here, of course, is where the mother enters. Under the bastardy clauses, the responsibility for economic maintenance of bastard children was, for the first time, legally assigned to the mother, relieving the father of any and all obligation. Oliver Twist manages to critique the bastardy clauses for their release of the father, while simultaneously embracing the placement of the mother at the head of the family line. Both Oliver and the novel thus suggest that it is the mother's story that matters, her name through which we find our own. And by containing both plots – that of the father and the mother – Oliver Twist reveals the violence implicit in traditional modes of inheritance in the novel and under the law.

Application of Novel Low Current OBIRCH Amplifier and Nanoprobing to Identify Subtle Leakages in Advanced Node Technologies

2018 ◽  
Author(s):  
Satish Kodali ◽  
Liangshan Chen ◽  
Yuting Wei ◽  
Tanya Schaeffer ◽  
Chong Khiam Oh
Keyword(s):  
Signal To Noise Ratio ◽  
Semiconductor Industry ◽  
Fault Isolation ◽  
Ring Oscillator ◽  
High Signal ◽  
The Novel ◽  
Resistance Change ◽  
Three Samples ◽  
Relative Threshold ◽  
First Time

Abstract Optical beam induced resistance change (OBIRCH) is a very well-adapted technique for static fault isolation in the semiconductor industry. Novel low current OBIRCH amplifier is used to facilitate safe test condition requirements for advanced nodes. This paper shows the differences between the earlier and novel generation OBIRCH amplifiers. Ring oscillator high standby leakage samples are analyzed using the novel generation amplifier. High signal to noise ratio at applied low bias and current levels on device under test are shown on various samples. Further, a metric to demonstrate the SNR to device performance is also discussed. OBIRCH analysis is performed on all the three samples for nanoprobing of, and physical characterization on, the leakage. The resulting spots were calibrated and classified. It is noted that the calibration metric can be successfully used for the first time to estimate the relative threshold voltage of individual transistors in advanced process nodes.

Rhythmic Prose in Imperial Greek Literature

2018 ◽  
Author(s):  
G. O. Hutchinson
Keyword(s):  
The Novel ◽  
Greek Literature ◽  
System A ◽  
First Time

The chapter looks at the division between poetry and prose in ancient and other literatures, and shows the importance of rhythmic patterning in ancient prose. The development of rhythmic prose in Greek and Latin is sketched, the system explained and illustrated (from Latin). It is firmly established, for the first time, which of the main Greek non-Christian authors 31 BC–AD 300 write rhythmically. The method takes a substantial sample of random sentence-endings (usually 400) from each of a large number of Imperial authors; it compares that sample with one sample of the same size (400) drawn randomly from a range of authors earlier than the invention of this rhythmic system. A particular sort of X2-test is applied. Many Imperial authors, it emerges, write rhythmically; many do not. The genres most likely to offer rhythmic writing are, unexpectedly, narrative: historiography and the novel.

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