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The effect of iron in MRI and transverse relaxation of amyloid‐beta plaques in Alzheimer's disease

Published: Dec 22, 2014

Author(s): Mark D. Meadowcroft, Douglas G. Peters, Rahul P. Dewal, James R. Connor, Qing X. Yang

Journal: NMR in Biomedicine

Dysregulation of neural iron is known to occur during the progression of Alzheimer's disease. The visualization of amyloid‐beta (Aβ) plaques with MRI has largely been credited to rapid proton relaxation in the vicinity of plaques as a result of focal iron deposition. The goal of this work was to determine the relationship between local relaxation and related focal iron content associated with Aβ plaques. Alzheimer's disease (n = 5) and...

Read More thumbnail image: The effect of iron in MRI and transverse relaxation of amyloidbeta plaques in Alzheimers disease

Effect of oligonucleotide probes substituted by deoxyinosines on the specificity of SNP detection on the DNA microarray

Published: Dec 22, 2014

Author(s): Xiaoting Qian, Dan Pu, Bicheng Liu, Pengfeng Xiao

Journal: ELECTROPHORESIS

One of the main factors that can affect the quality of microarray results is the microarray hybridization specificity. The key factor that affects hybridization specificity is the design of the probes. In this paper, we described a novel oligonucleotide probe containing deoxyinosines aimed at improving DNA hybridization specificity. We compared different probes to determine the distance between deoxyinosine base and SNPs site and the...

Read More thumbnail image: Effect of oligonucleotide probes substituted by deoxyinosines on the specificity of SNP detection on the DNA microarray

Shedding light onto the spectra of lime: Raman and luminescence bands of CaO, Ca(OH) 2 and CaCO 3

Published: Dec 22, 2014

Author(s): Thomas Schmid, Petra Dariz

Journal: Journal of Raman Spectroscopy

In microscopy studies of 19th‐century cement stone, we found free lime in the form of darkened spherical structures, as they were described in the literature already. When trying to determine their phase composition by Raman spectroscopy, we encountered contradictive assignments in literature spectra of the lime phases CaO, Ca(OH)2 and CaCO3 and observed strong spectral features that have been ignored or erroneously assigned so far. In this study we...

Read More thumbnail image: Shedding light onto the spectra of lime Raman and luminescence bands of CaO CaOH 2 and CaCO 3

Protective yttria coatings of melting crucible for metallic fuel slugs

Published: Dec 22, 2014

Author(s): Jong‐Hwan Kim, Hoon Song, Ki‐Hwan Kim, Chan‐Bock Lee

Journal: Surface and Interface Analysis

As one of the candidate coating materials for a melting crucible, yttrium oxides were deposited on graphite and niobium substrates using slurry and plasma spraying methods. Thermal cycling tests and interaction studies between U–Zr/U–Zr–RE fuel melt and the Y2O3 coatings were carried out to evaluate the performance as reusable coatings for a melting crucible. A multi‐layer coating method was also applied to overcome the issue of a thermal...

Read More thumbnail image: Protective yttria coatings of melting crucible for metallic fuel slugs

Thermal curing and water re‐exposure of silane–PVA/PVAc complex film on glass fiber surface

Published: Dec 22, 2014

Author(s): Daniel Repovsky, Miroslav Michalka, Dusan Velic

Journal: Surface and Interface Analysis

Because glass fiber reinforced composites are in industrial demand, chemistry and topography of the glass fiber sizing are of interest. Silane–PVA/PVAc (polyvinyl alcohol/polyvinyl acetate) complex film on the glass fiber surface is studied during thermal curing and water re‐exposure by using atomic force microscopy. The complex film consists of silane with the honeycomb structure film and PVA/PVAc with the hexagonal close pack structure...

Read More thumbnail image: Thermal curing and water reexposure of silanePVAPVAc complex film on glass fiber surface

Extraction of hidden information of ToF‐SIMS data using different multivariate analyses

Published: Dec 22, 2014

Author(s): Yuta Yokoyama, Tomoko Kawashima, Mayumi Ohkawa, Hideo Iwai, Satoka Aoyagi

Journal: Surface and Interface Analysis

Time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) is a powerful tool for determining surface information of complex systems such as polymers and biological materials. However, the interpretation of ToF‐SIMS raw data is often difficult. Multivariate analysis has become effective methods for the interpretation of ToF‐SIMS data. Some of multivariate analysis methods such as principal component analysis and multivariate curve...

Read More thumbnail image: Extraction of hidden information of ToFSIMS data using different multivariate analyses

Surface evaluation and electrochemical behavior of cerium conversion coating modified with silane on magnesium alloy

Published: Dec 22, 2014

Author(s): Li Lei, Xin Wang, Wei Liu, Qunwei Tang

Journal: Surface and Interface Analysis

A new cerium conversion coating modified with the hydrolysis silane is designed for AZ31 magnesium alloy, which aims at assessing the surface characterizations and electrochemical behaviors between the cerium conversion coating with and without the silane modified. The effect of the silane addictive is studied by scanning electron microscopy (SEM) and X‐ray photoelectron spectroscopy (XPS). The adhesion of the coatings is undertaken...

Read More thumbnail image: Surface evaluation and electrochemical behavior of cerium conversion coating modified with silane on magnesium alloy

Investigation of the vibrational modes of ZnO grown by MOCVD on different orientation planes

Published: Dec 22, 2014

Author(s): S. Jabri, H. Souissi, A. Souissi, A. Meftah, V. Sallet, A. Lusson, P. Galtier, M. Oueslati

Journal: Journal of Raman Spectroscopy

Wurtzite ZnO thin films were prepared on sapphire substrate by metal organic chemical vapor deposition (MOCVD). Raman scattering studies on different crystallographic textures were performed in the backscattering geometry, and polarization effect is investigated in different configurations z − − ...

Read More thumbnail image: Investigation of the vibrational modes of ZnO grown by MOCVD on different orientation planes

Manganese‐enhanced MRI detection of impaired calcium regulation in a mouse model of cardiac hypertrophy

Published: Dec 19, 2014

Author(s): Martin Andrews, Maryellen L. Giger, Brian B. Roman

Journal: NMR in Biomedicine

The aim of this study was to use manganese (Mn)‐enhanced MRI (MEMRI) to detect changes in calcium handling associated with cardiac hypertrophy in a mouse model, and to determine whether the impact of creatine kinase ablation is detectable using this method. Male C57BL/6 (C57, n = 11) and male creatine kinase double‐knockout (CK‐M/Mito–/–, DBKO, n = 12) mice were imaged using the saturation recovery Look–Locker T1 mapping sequence before and after the...

Read More thumbnail image: Manganeseenhanced MRI detection of impaired calcium regulation in a mouse model of cardiac hypertrophy

Cortical phase changes measured using 7‐T MRI in subjects with subjective cognitive impairment, and their association with cognitive function

Published: Dec 19, 2014

Author(s): Sanneke Rooden, Mathijs Buijs, Marjolein E. Vliet, Maarten J. Versluis, Andrew G. Webb, Ania M. Oleksik, Lotte Wiel, Huub A. M. Middelkoop, Gerard Jan Blauw, Annelies W. E. Weverling‐Rynsburger, Jeroen D. C. Goos, Wiesje M. Flier, Ted Koene, Philip Scheltens, Frederik Barkhof, Ondine Rest, P. Eline Slagboom, Mark A. Buchem, Jeroen Grond

Journal: NMR in Biomedicine

Studies have suggested that, in subjects with subjective cognitive impairment (SCI), Alzheimer's disease (AD)‐like changes may occur in the brain. Recently, an in vivo study has indicated the potential of ultra‐high‐field MRI to visualize amyloid‐beta (Aβ)‐associated changes in the cortex in patients with AD, manifested by a phase shift on T2*‐weighted MRI scans. The main aim of this study was to investigate whether cortical phase shifts on...

Read More thumbnail image: Cortical phase changes measured using 7T MRI in subjects with subjective cognitive impairment and their association with cognitive function

A hybrid dielectrophoretic and hydrophoretic microchip for particle sorting using integrated prefocusing and sorting steps

Published: Dec 18, 2014

Author(s): Sheng Yan, Jun Zhang, Yuan Yuan, George Lovrecz, Gursel Alici, Haiping Du, Yonggang Zhu, Weihua Li

Journal: ELECTROPHORESIS

This work explores dielectrophoresis (DEP)‐active hydrophoresis in sorting particles and cells. The device consists of prefocusing region and sorting region with great potential to be integrated into advanced lab‐on‐a‐chip bioanalysis devices. Particles or cells can be focused in the prefocusing region and then sorted in the sorting region. The DEP‐active hydrophoretic sorting is not only based on size but also on dielectric properties of...

Read More thumbnail image: A hybrid dielectrophoretic and hydrophoretic microchip for particle sorting using integrated prefocusing and sorting steps

Process development for the decoloration of Panax notoginseng extracts: A design space approach

Published: Dec 18, 2014

Author(s): Teng Chen, Xingchu Gong, Huali Chen, Haibin Qu

Journal: Journal of Separation Science

A systematic, yet simple method for the decoloration of Panax notoginseng extracts has been developed by static adsorption tests and response surface methodology. Through static adsorption experiment screening, acidic alumina was selected because of its high decoloration ratio and saponin recovery ratios. Using response surface methodology, the correlation between the process parameters (i.e., sample volume and flow rate) and decoloration...

Read More thumbnail image: Process development for the decoloration of Panax notoginseng extracts A design space approach

Determination of multiple phytohormones in fruits by high‐performance liquid chromatography with fluorescence detection using dispersive liquid–liquid microextraction followed by precolumn fluorescent labeling

Published: Dec 18, 2014

Author(s): Guoliang Li, Shuaimin Lu, Hongliang Wu, Guang Chen, Shucheng Liu, Xiaojian Kong, Weiheng Kong, Jinmao You

Journal: Journal of Separation Science

Plant hormone determination in food matrices has attracted more and more attention because of their potential risks to human health. However, analytical methods for the analysis of multiple plant hormones remain poorly investigated. In the present study, a convenient, selective, and ultrasensitive high‐performance liquid chromatography method for the simultaneous determination of multiple classes of plant hormones has been developed...

Read More thumbnail image: Determination of multiple phytohormones in fruits by highperformance liquid chromatography with fluorescence detection using dispersive liquidliquid microextraction followed by precolumn fluorescent labeling

Online background cleanup followed by high‐performance liquid chromatography with tandem mass spectrometry for the analysis of perfluorinated compounds in human blood

Published: Dec 18, 2014

Author(s): Liangpo Liu, Jianwen She, Xueqin Zhang, Jie Zhang, Meiping Tian, Qingyu Huang, Syed Ali Musstjab Akber Shah Eqani, Heqing Shen

Journal: Journal of Separation Science

In this study, a novel method for the analysis of perfluorinated compounds in whole blood has been developed and validated. The method was developed by using a conventional reversed‐phase C18 column as a trapping column for the elimination of background contamination and high‐performance liquid chromatography with tandem mass spectrometry for the target compounds analysis. The trapping column provided fast online separation of the background ...

Read More thumbnail image: Online background cleanup followed by highperformance liquid chromatography with tandem mass spectrometry for the analysis of perfluorinated compounds in human blood

Simultaneous determination of florfenicol with its metabolite based on modified quick, easy, cheap, effective, rugged, and safe sample pretreatment and evaluation of their degradation behavior in agricultural soils

Published: Dec 18, 2014

Author(s): Mingfei Xu, Mingrong Qian, Hu Zhang, Junwei Ma, Jianmei Wang, Huizhen Wu

Journal: Journal of Separation Science

A simple and simultaneous method for the determination of florfenicol and its metabolite florfenicol amine in agricultural soils using modified quick, easy, cheap, effective, rugged, and safe sample pretreatment and reversed‐phase high‐performance liquid chromatography with tandem mass spectrometry is presented. Florfenicol and its metabolite florfenicol amine residues in agricultural soils were extracted with alkalized acetonitrile and...

Read More thumbnail image: Simultaneous determination of florfenicol with its metabolite based on modified quick easy cheap effective rugged and safe sample pretreatment and evaluation of their degradation behavior in agricultural soils

Extracellular vesicles including exosomes are mediators of signal transduction: Are they protective or pathogenic?

Published: Dec 18, 2014

Author(s): Lahiru Gangoda, Stephanie Boukouris, Michael Liem, Hina Kalra, Suresh Mathivanan

Journal: PROTEOMICS

Extracellular vesicles (EVs) are signaling organelles that are released by many cell types and is highly conserved in both prokaryotes and eukaryotes. Based on the mechanism of biogenesis, these membranous vesicles can be classified as exosomes, shedding microvesicles, and apoptotic blebs. It is becoming clearer that these EVs mediate signal transduction in both autocrine and paracrine fashion by the transfer of proteins and RNA. While...

Read More thumbnail image: Extracellular vesicles including exosomes are mediators of signal transduction Are they protective or pathogenic

Nitrogen uptake of nickel free austenitic stainless steel powder during heat treatment—an XPS study

Published: Dec 18, 2014

Author(s): Anna Weddeling, Kathrin Lefor, Eduard Hryha, Stephan Huth, Lars Nyborg, Sebastian Weber, Werner Theisen

Journal: Surface and Interface Analysis

In austenitic stainless steel nitrogen stabilizes the austenitic phase, improves the mechanical properties and increases the corrosion resistance. Nitrogen alloying enables to produce austenitic steels without the element nickel which is high priced and classified as allergy inducing. A novel production route is nitrogen alloying of CrMn‐prealloyed steel powder via the gas phase. This is beneficial as the nitrogen content can be adjusted...

Read More thumbnail image: Nitrogen uptake of nickel free austenitic stainless steel powder during heat treatmentan XPS study

Image fusion combining SEM and ToF‐SIMS images

Published: Dec 18, 2014

Author(s): Tammy Milillo, Robert Hard, Brett Yatzor, Mary Ellen Miller, Joseph Gardella

Journal: Surface and Interface Analysis

Image fusion allows for the combination of an image containing chemical information but low spatial resolution with a high‐spatial resolution image having little to no chemical information. The resulting hybrid image retains all the information from the chemically relevant original image, with improved spatial resolution allowing for visual inspection of the spatial correlations. In this research, images were obtained from two sample test...

Read More thumbnail image: Image fusion combining SEM and ToFSIMS images

Interfacial bonding mechanism and bonding strength of AlTiCrN coating by cathodic arc ion plating

Published: Dec 18, 2014

Author(s): Kong Dejun, Fu Guizhong, Wang Jinchun

Journal: Surface and Interface Analysis

AlTiCrN coating was prepared on the surface of YT14 tungsten carbide cutting tools by cathodic arc ion plating with Ti, Al and Cr as targets. The surface morphologies, interface energy spectrum, phase and elements' binding energy of the coatings were observed with SEM, EDS, XRD and XPS, respectively, and bonding strength of the coating interface was measured with scratch tester. The results show that the phases of AlTiCrN coating are...

Read More thumbnail image: Interfacial bonding mechanism and bonding strength of AlTiCrN coating by cathodic arc ion plating

Growth of c ‐axis‐oriented aluminum nitride thin films onto different substrates and buffer layers

Published: Dec 18, 2014

Author(s): T. J. A. Mori, R. D. Della Pace, A. M. H. Andrade, M. A. Corrêa, P. Stamenov, L. F. Schelp, L. S. Dorneles

Journal: Surface and Interface Analysis

The growth of aluminum nitride thin films onto various substrates (glass, flexible polyimide, or silicon) and onto different buffer layers (Au, Nb, Cu, Ag, Co, Fe, NiFe, or IrMn) is reported. Samples grown on IrMn, Co, NiFe, Nb, or Au show smooth surfaces. This same smooth quality is observed in samples grown at a lower 200 °C temperature directly on glass, Si, or flexible polyimide. In applications where thin and smooth piezoelectric...

Read More thumbnail image: Growth of c axisoriented aluminum nitride thin films onto different substrates and buffer layers
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