In-situ spectroscopic analysis of the recombination kinetics in UVB LEDs during their operation

2020 ◽  
Vol 117 (12) ◽  
pp. 121104 ◽  
Author(s):  
Jan Ruschel ◽  
Johannes Glaab ◽  
Felix Mahler ◽  
Tim Kolbe ◽  
Sven Einfeldt ◽  
...  
Keyword(s):  
Spectroscopic Analysis ◽  
Recombination Kinetics

scholarly journals New from Old: Thorectandrin Alkaloids in a Southern Australian Marine Sponge, Thorectandra choanoides (CMB-01889)

Marine Drugs ◽  
2021 ◽  
Vol 19 (2) ◽  
pp. 97
Author(s):  
Shamsunnahar Khushi ◽  
Angela A. Salim ◽  
Ahmed H. Elbanna ◽  
Laizuman Nahar ◽  
Robert J. Capon
Keyword(s):  
Marine Sponge ◽  
Tissue Specificity ◽  
Spectroscopic Analysis ◽  
Transformation Products ◽  
Chemical Fractionation ◽  
Cancer Tissue ◽  
Michael Acceptor ◽  
Michael Acceptors ◽  
Stable Ring

Thorectandra choanoides (CMB-01889) was prioritized as a source of promising new chemistry from a library of 960 southern Australian marine sponge extracts, using a global natural products social (GNPS) molecular networking approach. The sponge was collected at a depth of 45 m. Chemical fractionation followed by detailed spectroscopic analysis led to the discovery of a new tryptophan-derived alkaloid, thorectandrin A (1), with the GNPS cluster revealing a halo of related alkaloids 1a–1n. In considering biosynthetic origins, we propose that Thorectandrachoanoides (CMB-01889) produces four well-known alkaloids, 6-bromo-1′,8-dihydroaplysinopsin (2), 6-bromoaplysinopsin (3), aplysinopsin (4), and 1′,8-dihydroaplysinopsin (10), all of which are susceptible to processing by a putative indoleamine 2,3-dioxygenase-like (IDO) enzyme to 1a–1n. Where the 1′,8-dihydroalkaloids 2 and 10 are fully transformed to stable ring-opened thorectandrins 1 and 1a–1b, and 1h–1j, respectively, the conjugated precursors 3 and 4 are transformed to highly reactive Michael acceptors that during extraction and handling undergo complete transformation to artifacts 1c–1g, and 1k–1n, respectively. Knowledge of the susceptibility of aplysinopsins as substrates for IDOs, and the relative reactivity of Michael acceptor transformation products, informs our understanding of the pharmaceutical potential of this vintage marine pharmacophore. For example, the cancer tissue specificity of IDOs could be exploited for an immunotherapeutic response, with aplysinopsins transforming in situ to Michael acceptor thorectandrins, which covalently bind and inhibit the enzyme.

Possibility of in situ spectroscopic analysis for iron rust on the running band of rail

Wear ◽  
2008 ◽  
Vol 265 (9-10) ◽  
pp. 1396-1401 ◽  
Author(s):  
Yasutomo Sone ◽  
Junichi Suzumura ◽  
Takumi Ban ◽  
Fusayoshi Aoki ◽  
Makoto Ishida
Keyword(s):  
Spectroscopic Analysis

In Situ ATR-FTIR Spectroscopic Analysis of NMC622 Cathode: Correlating Specific Chemistries within the Cathode-Electrolyte Interface to FTIR Signatures

2020 ◽  
Vol MA2020-02 (4) ◽  
pp. 784-784
Author(s):  
Bertrand Tremolet de Villers ◽  
Junghoon Yang ◽  
Seongmin Bak ◽  
Sang-Don Han
Keyword(s):  
Spectroscopic Analysis ◽  
Electrolyte Interface

In situ Raman and UV-Vis spectroscopic analysis of lithium-ion batteries

2015 ◽  
Vol 1773 ◽  
pp. 33-40 ◽  
Author(s):  
Marcel Heber ◽  
Christian Schilling ◽  
Toni Gross ◽  
Christian Hess
Keyword(s):  
Lithium Ion Batteries ◽  
Spectroscopic Analysis ◽  
Electrode Materials ◽  
Lithium Ion ◽  
In Situ Raman ◽  
Spatially Resolved ◽  
Conductive Additives ◽  
Electrochemical Cycling ◽  
Carbon Based

ABSTRACTThe potential of Raman and UV-Vis diagnostics for spatially-resolved and in situ diagnostics of lithium-ion batteries is demonstrated. Regarding the use of in situ Raman diagnostics focus is put on LiCoO2 electrode materials, which were investigated in detail as composites of LiCoO2 with binder and conductive additives. The potential of in situ UV-Vis analysis is illustrated for carbon-based materials showing significant absorption changes during electrochemical cycling due to lithium de-/intercalation.

In Situ Spectroscopic Analysis of Sub-Second Switching Polymer Electrochromes

2011 ◽  
Vol 21 (23) ◽  
pp. 4535-4542 ◽  
Author(s):  
David Y. Liu ◽  
Andrew D. Chilton ◽  
Pengjie Shi ◽  
Michael R. Craig ◽  
Steven D. Miles ◽  
...  
Keyword(s):  
Spectroscopic Analysis

Colouring materials of pre-Columbian codices: non-invasive in situ spectroscopic analysis of the Codex Cospi

2012 ◽  
Vol 39 (3) ◽  
pp. 672-679 ◽  
Author(s):  
C. Miliani ◽  
D. Domenici ◽  
C. Clementi ◽  
F. Presciutti ◽  
F. Rosi ◽  
...  
Keyword(s):  
Spectroscopic Analysis ◽  
Non Invasive
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