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Relation between plasmonic tip emission and electromagnetic enhancement evidenced in tip‐enhanced Raman spectroscopy

Published: Oct 17, 2017

Author(s): J. Plathier, A. Merlen, A. Pignolet, A. Ruediger

Journal: Journal of Raman Spectroscopy

Abstract We report tip‐enhanced Raman spectroscopy measurements of single wall carbon nanotubes deposited on a barium titanate substrate. The tip‐enhanced Raman spectroscopy mappings demonstrate that the evolution of the gold tip enhanced luminescence is strongly correlated with the intensity of the Raman modes from the single wall carbon nanotubes and the substrate. As the tip emission is directly related to the plasmonic...

Read More thumbnail image: Relation between plasmonic tip emission and electromagnetic enhancement evidenced in tipenhanced Raman spectroscopy

Combined imaging and molecular techniques for evaluating microbial function and composition: A review

Published: Oct 17, 2017

Author(s): Christopher G. Weisener, Thomas Reid

Journal: Surface and Interface Analysis

In most cases, microbial function will determine the direction and onset of specific metabolic pathways as defined by their favorable thermodynamic outcome. Thus, the degree of chemical alteration in contact with minerals and bacteria can be directly proportional to the biological activity. This activity can influence redox conditions both from a localized perspective and global scale. Under these conditions, microscale mechanisms become...

Read More thumbnail image: Combined imaging and molecular techniques for evaluating microbial function and composition A review

Practical estimation of XPS binding energies using widely available quantum chemistry software

Published: Oct 17, 2017

Author(s): Sabrina Tardio, Peter J. Cumpson

Journal: Surface and Interface Analysis

Chemical shifts observed in high‐resolution X‐ray photoelectron spectroscopy (XPS) spectra are normally used to determine the chemical state of the elements of interest. Often, these shifts are small, or an element is present in several oxidation states in the same sample, so that interpretation of the spectra is difficult without good reference data on binding energies of the likely constituents. In many cases, reference spectra taken...

Read More thumbnail image: Practical estimation of XPS binding energies using widely available quantum chemistry software

Application of quantitative X‐ray photoelectron spectroscopy (XPS) imaging: investigation of Ni‐Cr‐Mo alloys exposed to crevice corrosion solution

Published: Oct 16, 2017

Author(s): Brad Kobe, Martin Badley, Jeffrey D. Henderson, Samantha Anderson, Mark C. Biesinger, Dave Shoesmith

Journal: Surface and Interface Analysis

This paper explores quantitative X‐ray photoelectron spectroscopy imaging on three different Ni‐Cr‐Mo Hastelloy® alloys (BC‐1, C‐22 and G‐30) with differing Cr and Mo contents. The alloys were subjected to a simulated critical crevice corrosion solution. Ni‐based alloys have been shown to exhibit excellent resistance to a range of corrosive media due to the formation of an inert oxide layer, primarily containing Cr and Mo. However, these...

Read More thumbnail image: Application of quantitative Xray photoelectron spectroscopy XPS imaging investigation of NiCrMo alloys exposed to crevice corrosion solution

The surface chemistry of metallurgical aluminas

Published: Oct 16, 2017

Author(s): Grant J. McIntosh, James B. Metson, Margaret M. Hyland

Journal: Surface and Interface Analysis

We have studied the evolution of surface basicity as a function of calcination temperature in a range of transition alumina‐rich analogues of metallurgical grade aluminas produced by calcination of Bayer gibbsite. Specific basicity, the number of basic sites per unit surface area, was determined by thermometric back‐titration and found to increase with calcination temperature up to ~700°C to 800°C, decreasing dramatically thereafter. The...

Read More thumbnail image: The surface chemistry of metallurgical aluminas

Insulin Mediated Activation of PI3K/Akt Signalling Pathway Modifies the Proteomic Cargo of Extracellular Vesicles

Published: Oct 16, 2017

Author(s): Michael Liem, Ching‐Seng Ang, Suresh Mathivanan

Journal: PROTEOMICS

Abstract Epidemiological studies suggest that diabetes and obesity increases the risk of colorectal cancer (CRC) and lowers the patient survival rate. An important attribute in diabetes and obesity is the presence of high levels of growth factors including insulin in blood which can activate the PI3K/Akt signalling pathway. Dysregulation of PI3K/Akt signalling pathway leads to sustained proliferative signals thereby allowing the...

Read More thumbnail image: Insulin Mediated Activation of PI3KAkt Signalling Pathway Modifies the Proteomic Cargo of Extracellular Vesicles

Simultaneous determination of serum propafenone and its metabolites using high‐performance liquid chromatography

Published: Oct 15, 2017

Author(s): Yuki Shirayama, Kosuke Doki, Yukio Sekiguchi, Kazutaka Aonuma, Yukinao Kohda, Masato Homma

Journal: Biomedical Chromatography

Abstract Propafenone, a class Ic antiarrhythmic agent, is metabolized to 5‐hydroxypropafeone (5‐OHP) and N‐depropylpropafenone (NDPP). Simultaneous determination of serum propafenone and its metabolites was performed using HPLC equipped with a conventional octadecylsilyl silica column and ultraviolet detector. The wavelength was set at 250 nm. Propafenone and its metabolites in the serum were extracted using diethyl ether. The mobile phase...

Read More thumbnail image: Simultaneous determination of serum propafenone and its metabolites using highperformance liquid chromatography

Quantification through TLC‐densitometric analysis, repellency and anticholinesterase activity of the homemade extract of Indian cloves

Published: Oct 15, 2017

Author(s): Raphael S. Affonso, Josélia A. Lima, Bruno M. Lessa, João V. O. Caetano, Marcos T. Obara, Andréa B. Nóbrega, Eugenie Nepovimova, Kamil Musilek, Kamil Kuca, Gláucia B. C. A. Slana, Tanos C. C. França

Journal: Biomedical Chromatography

Abstract The rise of the mosquitoes‐transmitted diseases, like dengue, zika and chikungunya in Brazil in the last years has increased concerns on protection against mosquitoes bites. However, the prohibitive prices of the commercially available repellents for the majority of the Brazilian population has provoked a search for cheaper solutions, like the use of the homemade ethanolic extract of Indian clove (Syzygium aromaticum L.) as...

Read More thumbnail image: Quantification through TLCdensitometric analysis repellency and anticholinesterase activity of the homemade extract of Indian cloves

Dynamic residual pattern of azoxystrobin in Swiss chard with contribution to safety evaluation

Published: Oct 15, 2017

Author(s): Waziha Farha, A. M. Abd El‐Aty, Md. Musfiqur Rahman, Md. Humayun Kabir, Hyung Suk Chung, Han Sol Lee, Jong‐Sup Jeon, Jing Wang, Byung‐Joon Chang, Ho‐Chul Shin, Jae‐Han Shim

Journal: Biomedical Chromatography

Abstract This study aimed at quantifying the residual amount of azoxystrobin in Swiss chard samples grown under greenhouse conditions at two different locations (Gwangju and Naju, Republic of Korea). Samples were extracted with acetonitrile, separated by salting out, and subjected to purification by using solid‐phase extraction. The analyte was identified using liquid chromatography–ultraviolet detection. The linearity of the...

Read More thumbnail image: Dynamic residual pattern of azoxystrobin in Swiss chard with contribution to safety evaluation

A rapid and simple HPTLC assay for therapeutic drug monitoring of capecitabine in colorectal cancer patients

Published: Oct 15, 2017

Author(s): Sonali G. Thorat, Rupesh V. Chikhale, Madhukar R. Tajne

Journal: Biomedical Chromatography

Abstract Capecitabine is a prodrug of 5‐flurouracil, employed as a broad spectrum chemotherapeutic agent. It is also used as monotherapy or a combination chemotherapy agent for the treatment of colorectal cancer. Capecitabine is administered in combination with oxaliplatin and hence it is essential to determine that co‐administration does not affect its metabolism. To determine the plasma concentration of capecitabine a simple HPTLC...

Read More thumbnail image: A rapid and simple HPTLC assay for therapeutic drug monitoring of capecitabine in colorectal cancer patients

Laser desorption ionization mass spectrometry: Recent progress in matrix‐free and label‐assisted techniques

Published: Oct 13, 2017

Author(s): Arundhoti Mandal, Monisha Singha, Partha Sarathi Addy, Amit Basak

Journal: Mass Spectrometry Reviews

The MALDI‐based mass spectrometry, over the last three decades, has become an important analytical tool. It is a gentle ionization technique, usually applicable to detect and characterize analytes with high molecular weights like proteins and other macromolecules. The earlier difficulty of detection of analytes with low molecular weights like small organic molecules and metal ion complexes with this technique arose...

Read More thumbnail image: Laser desorption ionization mass spectrometry Recent progress in matrixfree and labelassisted techniques

Comparative chemometric analysis for classification of acids and bases via a colorimetric sensor array

Published: Oct 13, 2017

Author(s): Michael J. Kangas, Raychelle M. Burks, Jordyn Atwater, Rachel M. Lukowicz, Billy Garver, Andrea E. Holmes

Journal: Journal of Chemometrics

Abstract With the increasing availability of digital imaging devices, colorimetric sensor arrays are rapidly becoming a simple, yet effective tool for the identification and quantification of various analytes. Colorimetric arrays utilize colorimetric data from many colorimetric sensors, with the multidimensional nature of the resulting data necessitating the use of chemometric analysis. Herein, an 8 sensor colorimetric array was...

Read More thumbnail image: Comparative chemometric analysis for classification of acids and bases via a colorimetric sensor array

Accurate model based on artificial intelligence for prediction of carbon dioxide solubility in aqueous tetra‐ n ‐butylammonium bromide solutions

Published: Oct 13, 2017

Author(s): Seyed‐Ahmad Hoseinpour, Ali Barati‐Harooni, Payam Nadali, Armin Mohebbi, Adel Najafi‐Marghmaleki, Afshin Tatar, Alireza Bahadori

Journal: Journal of Chemometrics

Abstract This study highlights the application of radial basis function (RBF) neural networks, adaptive neuro‐fuzzy inference systems (ANFIS), and gene expression programming (GEP) in the estimation of solubility of CO2 in aqueous solutions of tetra‐n‐butylammonium bromide (TBAB). The experimental data were gathered from a published work in literature. The proposed RBF network was coupled with genetic algorithm (GA) to access a better...

Read More thumbnail image: Accurate model based on artificial intelligence for prediction of carbon dioxide solubility in aqueous tetra n butylammonium bromide solutions

Autotransporter Adhesins in Escherichia coli Pathogenesis

Published: Oct 12, 2017

Author(s): Julieanne L. Vo, Gabriela Constanza Martínez Ortiz, Pramod Subedi, Shivakumar Keerthikumar, Suresh Mathivanan, Jason J. Paxman, Begoña Heras

Journal: PROTEOMICS

Abstract Most bacteria produce adhesion molecules to facilitate the interaction with host cells and establish successful infections. An important group of bacterial adhesins belong to the autotransporter (AT) superfamily, the largest group of secreted and outer membrane proteins in Gram‐negative bacteria. AT adhesins possess diverse functions that facilitate bacterial colonisation, survival and persistence, and as such are often...

Read More thumbnail image: Autotransporter Adhesins in Escherichia coli Pathogenesis

Small but Mighty: Functional Peptides Encoded by Small ORFs in Plants

Published: Oct 12, 2017

Author(s): Polly Yingshan Hsu, Philip N. Benfey

Journal: PROTEOMICS

Abstract Peptides encoded by small open reading frames (sORFs, usually <100 codons) play critical regulatory roles in plant development and environmental responses. Despite their importance, only a small number of these peptides have been identified and characterized. Genomic studies have revealed that many plant genomes contain thousands of possible sORFs, which could potentially encode small peptides. The challenge is to...

Read More thumbnail image: Small but Mighty Functional Peptides Encoded by Small ORFs in Plants

A two‐step method for rapid characterization of electroosmotic flows in capillary electrophoresis

Published: Oct 12, 2017

Author(s): Wenjing Zhang, Muyi He, Tao Yuan, Wei Xu

Journal: ELECTROPHORESIS

Abstract The measurement of electroosmotic flow (EOF) is important in a capillary electrophoresis (CE) experiment in terms of performance optimization and stability improvement. Although several methods exist, there are demanding needs to accurately characterize ultra‐low electroosmotic flow rates (EOF rates), such as in coated capillaries used in protein separations. In this work, a new method, called the two‐step method, was...

Read More thumbnail image: A twostep method for rapid characterization of electroosmotic flows in capillary electrophoresis

Modeling and predicting the solute polarity parameter in reversed‐phase liquid chromatography using quantitative structure–property relationship approaches

Published: Oct 12, 2017

Author(s): Hassan Golmohammadi, Zahra Dashtbozorgi, Sajad Khooshechin

Journal: Journal of Separation Science

Abstract A prediction of quantitative structure–property relationships is developed to model the polarity parameter of a set of 146 organic compounds in acetonitrile in reversed‐phase liquid chromatography. Enhanced replacement method and support vector machine regressions were employed to build prediction models based on molecular descriptors calculated from the structure alone. The correlation coefficients between experimental and...

Read More thumbnail image: Modeling and predicting the solute polarity parameter in reversedphase liquid chromatography using quantitative structureproperty relationship approaches

Qualitative and quantitative analysis of chemical constituents in Ardisiae Japonicae Herba

Published: Oct 11, 2017

Author(s): Ke‐Yun Yu, Wen Gao, Shang‐Zhen Li, Wei Wu, Pei Li, Li‐Li Dou, Yuan‐Zhong Wang, E‐Hu Liu

Journal: Journal of Separation Science

Abstract Ardisiae Japonicae Herba is a well‐known traditional Chinese medicine for the treatment of bronchitis conjunctivitis, pneumonia, and trauma. In this work, a high‐performance liquid chromatography coupled with quadrupole time‐of‐flight mass spectrometry method was first established for the separation and structural identification of the chemical constituents in Ardisiae Japonicae Herba. A total of 15 compounds including...

Read More thumbnail image: Qualitative and quantitative analysis of chemical constituents in Ardisiae Japonicae Herba

Effect of thicknesses of InP epilayers on InP/GaAs heterostructure

Published: Oct 11, 2017

Author(s): Jingjuan Li, Zuoxing Guo, Liang Zhao, Zhengquan Jia, Min Zhang, Lei Zhao

Journal: Surface and Interface Analysis

InP epilayers with different thicknesses were grown on GaAs substrates at a low temperature by using metalorganic chemical vapor deposition. Atom force microscope and double‐crystal X‐ray were carried out to investigate the morphology and the crystal quality. Transmission electron microscopy was performed to characterize the microstructure and morphology. It was found that with the epilayer thicknesses increased, the crystal quality was...

Read More thumbnail image: Effect of thicknesses of InP epilayers on InPGaAs heterostructure

Small Proteins Encoded by Unannotated ORFs are Rising Stars of the Proteome, Confirming Shortcomings in Genome Annotations and Current Vision of an mRNA

Published: Oct 11, 2017

Author(s): Vivian Delcourt, Antanas Staskevicius, Michel Salzet, Isabelle Fournier, Xavier Roucou

Journal: PROTEOMICS

Abstract Short ORF‐encoded peptides and small proteins in eukaryotes have been hiding in the shadow of large proteins for a long time. Recently, improved identifications in MS‐based proteomics and ribosome profiling resulted in the detection of large numbers of small proteins. The variety of functions of small proteins is also emerging. It seems to be the right time to reflect on why small proteins remained invisible. In addition to...

Read More thumbnail image: Small Proteins Encoded by Unannotated ORFs are Rising Stars of the Proteome Confirming Shortcomings in Genome Annotations and Current Vision of an mRNA
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