نتایج جستجو برای: شاخص esi

تعداد نتایج: 84052  

Journal: :F1000Research 2021

Background: Pinang yaki has bioactive compounds that have potential as a new herbal supplement. A better understanding of the pinang using untargeted metabolomic profiling studies will provide clearer insight into health benefits and in particular its for therapy prevention Covid-19. Methods: Fresh samples (Areca vestiaria) are ob...

Journal: :Journal of the American Society for Mass Spectrometry 2004

2013
Lorenzo Testa Stefania Brocca Carlo Santambrogio Annalisa D’Urzo Johnny Habchi Sonia Longhi Vladimir N Uversky Rita Grandori

Intrinsically disordered proteins (IDPs) exert key biological functions but tend to escape identification and characterization due to their high structural dynamics and heterogeneity. The possibility to dissect conformational ensembles by electrospray-ionization mass spectrometry (ESI-MS) offers an attracting possibility to develop a signature for this class of proteins based on their peculiar ...

In the present work, the exergy analysis and economic study of 3 different samples of threecomponent mixtures have been investigated (ESI>1, ESI≈1, and ESI<1). The feed mixture has been tested under three different compositions (low, equal, and high contents of the intermediate component). A quantitative comparison between simple and complex configurations, considering thermally coupled, thermo...

Journal: :Chemosensors 2022

The first chalcone-based colorimetric chemosensor DPP (sodium (E)-2,4-dichloro-6-(3-oxo-3-(pyridine-2-yl)prop-1-en-1-yl)phenolate) was synthesized for detecting Ni2+ in near-perfect water. synthesis of validated by using 1H, 13C NMR and ESI-MS. selectively sensed through the color variation from yellow to purple. Detection limit calculated be 0.36 μM (3σ/slope), which is below standard (1.2 μM)...

Journal: :Journal of the American Society for Mass Spectrometry 2005
Trine Henriksen René K Juhler Bo Svensmark Nadja B Cech

The purpose of the work presented here was to evaluate the influence of solution composition and analyte characteristics on responsiveness to analysis with negative ion electrospray ionization mass spectrometry. The responses of a series of structurally diverse acidic molecules were compared in various solvents. Response was generally observed to be higher in methanol than acetonitrile and resp...

Journal: :Rapid communications in mass spectrometry : RCM 2006
Yi-Ting Wu Yu-Chie Chen

Conventionally, electrospray ionization ion trap mass spectrometry (ESI-ITMS) is not used for the analysis of metal ions because metal ions may be of too low mass to be trapped by the mass analyzer. Furthermore, metal ions can easily precipitate during ESI processes because of their poor volatilities. We present an approach for solving these two problems using milk as the sample to demonstrate ...

2014
Gwénael Birot Laurent Spinelli Serge Vulliémoz Pierre Mégevand Denis Brunet Margitta Seeck Christoph M. Michel

Electrical source imaging (ESI) aims at reconstructing the electrical brain activity from scalp EEG. When applied to interictal epileptiform discharges (IEDs), this technique is of great use for identifying the irritative zone in focal epilepsies. Inaccuracies in the modeling of electro-magnetic field propagation in the head (forward model) may strongly influence ESI and lead to mislocalization...

Journal: :Journal of electron microscopy 2002
Jing-Yi Yan Fu-Rong Chen Ji-Jung Kai

A set of signal processing methods comprising fast Fourier transform interpolation, maximum entropy deconvolution and wavelet transformation has been successfully integrated to improve the equality of the extracted C K-edge spectra from electron spectroscopic imaging (ESI) series. Fast Fourier transform interpolation is used to improve the dispersion arising from discrete sampling of ESI series...

Journal: :Environmental science & technology 2012
Adam P Bateman Julia Laskin Alexander Laskin Sergey A Nizkorodov

The applicability of high-resolution electrospray ionization mass spectrometry (HR ESI-MS) to measurements of the average oxygen to carbon ratio (O/C) in secondary organic aerosols (SOAs) was investigated. Solutions with known average O/C containing up to 10 standard compounds representative of low-molecular-weight SOA constituents were analyzed and the corresponding electrospray ionization eff...

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