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XPS study of structural transformations in some Ni complexes

Published: Mar 23, 2018

Author(s): A. Naumkin, T. Ivanova, A. Sidorov, K. Maslakov, M. Kiskin, S. Savilov, V. Lunin, V. Novotortsev, I. Eremenko

Journal: Surface and Interface Analysis

X‐ray photoelectron spectroscopy investigations of Ni(LCH3)3(Piv)2 (1), [Ni(LCH3)2]2(Piv)2) (2), and [Ni(LCH3)2]2(CH3COO)2] (3) complexes, where LCH3—k2‐1,2‐diamino‐4,5‐dimethylbenzene‐bis(k1‐diamino‐4,5‐dimethylbenzene) and Piv—(CH3)3CCOO, are reported and discussed. The photoelectron spectra are sensitive to the temperature of the samples and evidence on structural conformations.

Read More thumbnail image: XPS study of structural transformations in some Ni complexes

Polytetrafluoroethylene tape as a low‐cost hydrophobic substrate for drop‐coating deposition Raman spectroscopy of proteins

Published: Mar 23, 2018

Author(s): James Smith, Heike Arnolds

Journal: Journal of Raman Spectroscopy

Abstract Highly hydrophobic substrates are desirable for drop coating deposition Raman spectroscopy of proteins, because they concentrate the analyte during drying. Most of the commercial substrates used to date are comparatively expensive, whereas thiol or silane functionalisation of surfaces requires a degree of experience not available in a typical biology laboratory. Here, we show that polytetrafluoroethylene tape, commercially...

Read More thumbnail image: Polytetrafluoroethylene tape as a lowcost hydrophobic substrate for dropcoating deposition Raman spectroscopy of proteins

Raman spectroscopic study of six synthetic anhydrous sulfates relevant to the mineralogy of fumaroles

Published: Mar 23, 2018

Author(s): F. Košek, A. Culka, J. Jehlička

Journal: Journal of Raman Spectroscopy

Abstract Fumaroles, vents that emit hot gases and vapor, are an accompanying phenomenon of volcanic activity. Such phenomena are also observed within the framework of self‐ignited burning coal seams and coal heap fires, if less commonly. The high temperatures and chemical reactions between the gas and solid phases are responsible for extensive alteration of surrounding rocks, resulting in mineral encrustations of unusual...

Read More thumbnail image: Raman spectroscopic study of six synthetic anhydrous sulfates relevant to the mineralogy of fumaroles

Broadband noncollinear optical parametric amplification under low‐frequency picosecond pump in homogeneous KTP crystal

Published: Mar 23, 2018

Author(s): K.A. Vereshchagin, V.B. Morozov, V.G. Tunkin

Journal: Journal of Raman Spectroscopy

Abstract The nature of cubic and cascaded quadratic nonlinear responses in the KTiOPO4 crystal under picosecond pump is studied. The main attention is paid to determination of the origin and properties of the blue radiation accompanying the red light amplification process (the central wavelength ~685 nm, bandwidth ~20 nm) in a noncollinear optical parametric amplifier (NOPA) pumped by the second‐harmonic radiation of the picosecond...

Read More thumbnail image: Broadband noncollinear optical parametric amplification under lowfrequency picosecond pump in homogeneous KTP crystal

Strictly conservative expected values in the case of heteroscedastic errors and their application to evidential breath alcohol confidence intervals for concentration measurements

Published: Mar 23, 2018

Author(s): Veli‐Matti Taavitsainen, Kirsi Muuriaisniemi‐Skippari, Teemu Gunnar, Heikki Ihalainen

Journal: Journal of Chemometrics

Abstract In this study, 2 different methods for determining strictly conservative confidence intervals for expected values in the case of heteroscedastic errors are presented. A conservative confidence interval means that a given false positive error rate is not exceeded. The novelty in both approaches is in carrying out the required approximations in such a way that this property holds. The other method is based on variance...

Read More thumbnail image: Strictly conservative expected values in the case of heteroscedastic errors and their application to evidential breath alcohol confidence intervals for concentration measurements

Application of off‐line two‐dimensional high‐performance countercurrent chromatography on the chloroform‐soluble extract of Cuscuta auralis seeds

Published: Mar 22, 2018

Author(s): Taewoong Rho, Kee Dong Yoon

Journal: Journal of Separation Science

Abstract In this study, the chloroform‐soluble extract of Cuscuta auralis was separated successfully using off‐line two‐dimensional high‐performance countercurrent chromatography, yielding a γ‐pyrone, two alkaloids, a flavonoid, and four lignans. The first‐dimensional countercurrent separation using a methylene chloride/methanol/water (11:6:5, v/v/v) system yielded three subfractions (fractions I–III). The second‐dimensional countercurrent...

Read More thumbnail image: Application of offline twodimensional highperformance countercurrent chromatography on the chloroformsoluble extract of Cuscuta auralis seeds

The metabolism of flubendazole in human liver and cancer cell lines

Published: Mar 22, 2018

Author(s): Lucie Raisová Stuchlíková, Věra Králová, Kateřina Lněničková, Tomáš Zárybnický, Petra Matoušková, Veronika Hanušová, Martin Ambrož, Zdeněk Šubrt, Lenka Skálová

Journal: Drug Testing and Analysis

Abstract Flubendazole (FLU), a benzimidazole anthelmintic drug widely used in veterinary medicine, has been approved for the treatment of gut‐residing nematodes in humans. In addition, FLU is now considered a promising anti‐cancer agent. Despite this, information about biotransformation of this compound in human is lacking. Moreover, there is no information regarding whether cancer cells are able to metabolize FLU in order to...

Read More thumbnail image: The metabolism of flubendazole in human liver and cancer cell lines

XPS study during a soft and progressive sputtering of a monolayer on indium phosphide by argon cluster bombardment

Published: Mar 22, 2018

Author(s): Damien Aureau, Mathieu Frégnaux, Christian Njel, Jackie Vigneron, Muriel Bouttemy, Anne‐Marie Gonçalves, Arnaud Etcheberry

Journal: Surface and Interface Analysis

Gas cluster ion beam is performed on an ultrathin “polyphosphazene‐like” film grown on indium phosphide substrates to obtain crucial properties of this model system. Unlike “standard” sputtering technique using monoatomic ions, a gentle progressive digging of this subnanometric thick layer has been realized thanks to the unique depth profiling features of gas cluster ion beam. Furthermore, our results highlight the properties of the...

Read More thumbnail image: XPS study during a soft and progressive sputtering of a monolayer on indium phosphide by argon cluster bombardment

Sequential interfacial reactions of SAC305 solder joints with thin ENEPIG surface finishes

Published: Mar 22, 2018

Author(s): Jeong‐Won Yoon, Jong‐Hoon Back, Seung‐Boo Jung

Journal: Surface and Interface Analysis

Sequential interfacial reactions of Sn‐3.0Ag‐0.5Cu solder on a new multilayer metallization, ENEPIG (electroless nickel‐electroless palladium‐immersion gold) with a 0.1‐μm‐thin Ni(P) layer (thin‐ENEPIG), during reflowing were evaluated in this study. After 20‐second reflow process, layer‐shaped (Au,Cu)Sn4 intermetallic compounds formed at the interface, and thin Ni and Pd layers underneath the Au layer remained unreacted on the...

Read More thumbnail image: Sequential interfacial reactions of SAC305 solder joints with thin ENEPIG surface finishes

The impact of the diamond reinforcing particle size on their interaction with the aluminum matrix of composites in the course of heating

Published: Mar 22, 2018

Author(s): Vladimir Popov

Journal: Surface and Interface Analysis

In aluminum matrix composites, the formation of aluminum carbide may occur during heating on contact between aluminum and the carbon reinforcing particles. Samples of composites with an aluminum matrix and various diamond reinforcing particles were prepared to determine the influence of the size of the diamond particles on this process. The composites were obtained via mechanical alloying. Annealing shows that the outcome is different for...

Read More thumbnail image: The impact of the diamond reinforcing particle size on their interaction with the aluminum matrix of composites in the course of heating

ANOVA tables and statistical significance of models

Published: Mar 14, 2018

Author(s): Richard G. Brereton

Journal: Journal of Chemometrics

Read More thumbnail image: ANOVA tables and statistical significance of models

Introduction to analysis of variance

Published: Mar 14, 2018

Author(s): Richard G. Brereton

Journal: Journal of Chemometrics

Read More thumbnail image: Introduction to analysis of variance

Sources of error

Published: Mar 14, 2018

Author(s): Richard G. Brereton

Journal: Journal of Chemometrics

Read More thumbnail image: Sources of error

Membranal and Blood‐Soluble HLA Class II Peptidome Analyses Using Data‐Dependent and Independent Acquisition

Published: Mar 14, 2018

Author(s): Danilo Ritz, Emiliano Sani, Hanna Debiec, Pierre Ronco, Dario Neri, Tim Fugmann

Journal: PROTEOMICS

Abstract The interaction between HLA class II peptide complexes on antigen‐presenting cells and CD4+ T cells is of fundamental importance for anticancer and antipathogen immunity as well as for the maintenance of immunological tolerance. To study CD4+ T cell reactivities, detailed knowledge of the presented peptides is necessary. In recent years, dramatic advances in the characterization of membranal and soluble HLA class I peptidomes could be...

Read More thumbnail image: Membranal and BloodSoluble HLA Class II Peptidome Analyses Using DataDependent and Independent Acquisition

Establishing the optimal blocks' order in SO‐PLS: Stepwise SO‐PLS and alternative formulations

Published: Mar 13, 2018

Author(s): Maria P. Campos, Ricardo Sousa, Marco S. Reis

Journal: Journal of Chemometrics

Abstract Methods capable of handling multiple blocks of data have increased in popularity both in industry and academia, namely, in the fields of chemistry, food and beverages, pharmacology, and biology. Among the multiblock methodologies, sequential orthogonalized partial least squares (SO‐PLS) has been attracting great interest, given its interpretation capabilities (eg, the possibility to estimate the relative additional...

Read More thumbnail image: Establishing the optimal blocks order in SOPLS Stepwise SOPLS and alternative formulations

Cross‐linked peptide identification: A computational forest of algorithms

Published: Mar 12, 2018

Author(s): Şule Yılmaz, Genet A. Shiferaw, Josep Rayo, Anastassios Economou, Lennart Martens, Elien Vandermarliere

Journal: Mass Spectrometry Reviews

Chemical cross‐linking analyzed by mass spectrometry (XL‐MS) has become an important tool in unravelling protein structure, dynamics, and complex formation. Because the analysis of cross‐linked proteins with mass spectrometry results in specific computational challenges, many computational tools have been developed to identify cross‐linked peptides from mass spectra and subsequently interpret the identified...

Read More thumbnail image: Crosslinked peptide identification A computational forest of algorithms

Process‐centric and data‐centric strategies for enhanced production of l ‐asparaginase—an anticancer enzyme, using marine‐derived Aspergillus niger

Published: Mar 12, 2018

Author(s): Anjana K. Vala, Dushyant R. Dudhagara, Bharti P. Dave

Journal: Journal of Chemometrics

Abstract The objective of the study was to achieve enhanced production of l‐asparaginase (LA), an anticancer enzyme, by a marine‐derived Aspergillus niger isolate. To improve LA production, optimization of pH, incubation time, and inoculum size was performed using process‐centric (response surface methodology [RSM]) and data‐centric (artificial neural network [ANN]) approaches. The optimized conditions led to a 108.62% rise in LA production....

Read More thumbnail image: Processcentric and datacentric strategies for enhanced production of l asparaginasean anticancer enzyme using marinederived Aspergillus niger

Glycosphingolipidomics of donkey milk by hydrophilic interaction liquid chromatography coupled to ESI and multistage MS

Published: Mar 12, 2018

Author(s): Cosima Damiana Calvano, Marco Glaciale, Francesco Palmisano, Tommaso R.I. Cataldi

Journal: ELECTROPHORESIS

Abstract Hydrophilic interaction liquid chromatography coupled to negative‐ion electrospray linear ion‐trap multiple‐stage MS (HILIC‐ESI‐MSn, n = 2,3) was used to characterize polar lipids occurring in donkey milk. Besides the detection of abundant phospholipids, the structural characterization and content evaluation of minor glycosphingolipids (GSLs) were assessed. We report an unprecedented characterization of 11 hexosyl‐ceramides...

Read More thumbnail image: Glycosphingolipidomics of donkey milk by hydrophilic interaction liquid chromatography coupled to ESI and multistage MS

Molecular imprinted polymers based on magnetic chitosan with different deep eutectic solvent monomers for the selective separation of catechins in black tea

Published: Mar 9, 2018

Author(s): Wanwan Ma, Yunliang Dai, Kyung Ho Row

Journal: ELECTROPHORESIS

Abstract Two types of molecular‐imprinted polymers‐based magnetic chitosan with facile deep eutectic solvent‐functional monomers (Fe3O4‐CTS@DES‐MIPs) were synthesized and applied as adsorbents in magnetic solid‐phase extraction (MSPE) for the selective recognition and separation of (+)‐catechin, (−)‐epicatechin, and (−)‐epigallocatechin gallate in black tea. The obtained Fe3O4‐CTS@DES‐MIPs were characterized by Fourier transform infrared spectroscopy and...

Read More thumbnail image: Molecular imprinted polymers based on magnetic chitosan with different deep eutectic solvent monomers for the selective separation of catechins in black tea

Continuous sheath‐free separation of drug‐treated human fungal pathogen Cryptococcus neoformans by morphology in biocompatible polymer solutions

Published: Mar 9, 2018

Author(s): Di Li, Jessica Zielinski, Lukasz Kozubowski, Xiangchun Xuan

Journal: ELECTROPHORESIS

Abstract Cryptococcal meningitis caused by Cryptococcus neoformans is the leading cause of fungal central nervous system infections. Current antifungal treatments for cryptococcal infections are inadequate partly due to the occurrence of drug resistance. Recent studies indicate that the treatment of the azole drug fluconazole changes the morphology of C. neoformans to form enlarged “multimeras” that consist of three or more connected...

Read More thumbnail image: Continuous sheathfree separation of drugtreated human fungal pathogen Cryptococcus neoformans by morphology in biocompatible polymer solutions
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