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Secondary ion mass spectrometry

Yoko Iwamatsu-Kobayashi, Syouta Abe, Yoshiyasu Fujieda, Ai Orimoto, Masafumi Kanehira, Keisuke Handa, Venkata Suresh Venkataiah, Wei Zou, Masaki Ishikawa, Masahiro Saito
The surface pre-reacted glass ionomer (S-PRG) filler, a component of composite resin, is capable of releasing metal ions that possess antibacterial activity against caries and periodontal pathogens. Although S-PRG has been suggested to be involved in oral disease prevention, no reports have been published regarding its preventive effect on periodontal disease in vivo . The present study investigated whether the eluate from S-PRG (S-PRG eluate) has a suppressive effect on tissue destruction induced in a mouse model of ligature-induced periodontal disease...
August 2017: Clinical and Experimental Dental Research
Paweł Piotr Michałowski, Sebastian Złotnik, Jakub Sitek, Krzysztof Rosiński, Mariusz Rudziński
Further development of GaN/AlGaN based optoelectronic devices requires optimization of the p-type material growth process. In particular, uncontrolled diffusion of Mg dopants may decrease the performance of a device. Thus it is meaningful to study the behavior of Mg and the origins of its diffusion in detail. In this work we have employed secondary ion mass spectrometry to study the diffusion of magnesium in GaN/AlGaN structures. We show that magnesium has a strong tendency to form Mg-H complexes which immobilize Mg atoms and restrain their diffusion...
May 9, 2018: Physical Chemistry Chemical Physics: PCCP
Joanna M Radziwill-Bienkowska, Pauline Talbot, Jasper B J Kamphuis, Véronique Robert, Christel Cartier, Isabelle Fourquaux, Esther Lentzen, Jean-Nicolas Audinot, Frédéric Jamme, Matthieu Réfrégiers, Jacek K Bardowski, Philippe Langella, Magdalena Kowalczyk, Eric Houdeau, Muriel Thomas, Muriel Mercier-Bonin
Titanium dioxide (TiO2 ) is commonly used as a food additive (E171 in the EU) for its whitening and opacifying properties. However, a risk of intestinal barrier disruption, including dysbiosis of the gut microbiota, is increasingly suspected because of the presence of a nano-sized fraction in this additive. We hypothesized that food-grade E171 and Aeroxyde P25 (identical to the NM-105 OECD reference nanomaterial in the European Union Joint Research Centre) interact with both commensal intestinal bacteria and transient food-borne bacteria under non-UV-irradiated conditions...
2018: Frontiers in Microbiology
Jonas K Hannestad, Fredrik Höök, Peter Sjövall
No abstract text is available yet for this article.
May 8, 2018: Biointerphases
D Suhard, C Tessier, L Manens, F Rebière, K Tack, M Agarande, Y Guéguen
Localization of uranium within cells is mandatory for the comprehension of its cellular mechanism of toxicity. Secondary Ion Mass Spectrometry (SIMS) has recently shown its interest to detect and localize uranium at very low levels within the cells. This technique requires a specific sample preparation similar to the one used for Transmission Electronic Microscopy, achieved by implementing different chemical treatments to preserve as much as possible the living configuration uranium distribution into the observed sample...
May 8, 2018: Microscopy Research and Technique
Paweł Piotr Michałowski, Iwona Pasternak, Paweł Ciepielewski, Francisco Paco Guinea, Włodek Strupiński
Ion bombardment of graphene leads to formation of defects which may be used to tune properties of the graphene based devices. In this work, however, we present that the presence of the graphene layer on a surface of a sample has a significant impact on the ion bombardment process: broken sp<sup>2</sup> bonds react with the incoming ions and trap them close to the surface of the sample preventing a standard ion implantation. For an ion bombardment with a low impact energy and significant dose (in the range of 10<sup>14</sup> atoms/cm<sup>2</sup>) an amorphization of the graphene layer is observed but at the same time most of the incoming ions do not penetrate the sample but stop at the surface thus forming a highly doped ultra-thin amorphous carbon layer...
May 8, 2018: Nanotechnology
Bin Li, Sage J B Dunham, Joseph F Ellis, Justin D Lange, Justin R Smith, Ning Yang, Travis L King, Kensey R Amaya, Clint Matthew Arnett, Jonathan V Sweedler
The inherent architectural and chemical complexities of microbial biofilms mask our understanding of how these communities form, survive, propagate, and influence their surrounding environment. Here we describe a simple and versatile workflow for the cultivation and characterization of model flow-cell based microbial ecosystems. A customized low shear, drip flow reactor was designed and employed to cultivate single and co-culture flow-cell biofilms at the air-liquid interface of several metal surfaces. Pseudomonas putida F1 and Shewanella oneidensis MR-1 were selected as model organisms for this study...
May 3, 2018: Analytical Chemistry
Kevin Jeanne Dit Fouque, Javier Moreno, Julian D Hegemann, Séverine Zirah, Sylvie Rebuffat, Francisco Fernandez-Lima
Metal ions can play a significant role in a variety of important functions in protein systems including cofactor for catalysis, protein folding, assembly, structural stability and conformational change. In the present work, we examined the influence of alkali (Na, K and Cs), alkaline earth (Mg and Ca) and transition (Co, Ni and Zn) metal ions on the conformational space and analytical separation of mechanically interlocked lasso peptides. Syanodin I, sphingonodin I, caulonodin III and microcin J25, selected as models of lasso peptides, and their respective branched-cyclic topoisomers were submitted to native nESI trapped ion mobility spectrometry-mass spectrometry (TIMS-MS)...
May 3, 2018: Analyst
Katie L Moore, Ildefonso Rodríguez-Ramiro, Eleanor R Jones, Emily J Jones, Jorge Rodríguez-Celma, Kirstie Halsey, Claire Domoney, Peter R Shewry, Susan Fairweather-Tait, Janneke Balk
Pea seeds are widely consumed in their immature form, known as garden peas and petit pois, mostly after preservation by freezing or canning. Mature dry peas are rich in iron in the form of ferritin, but little is known about the content, form or bioavailability of iron in immature stages of seed development. Using specific antibodies and in-gel iron staining, we show that ferritin loaded with iron accumulated gradually during seed development. Immunolocalization and high-resolution secondary ion mass spectrometry (NanoSIMS) revealed that iron-loaded ferritin was located at the surface of starch-containing plastids...
May 2, 2018: Scientific Reports
Kelvin H L Zhang, Guoqiang Li, Steven R Spurgeon, Le Wang, Pengfei Yan, Zhaoying Wang, Meng Gu, Tamas Varga, Mark E Bowden, Zihua Zhu, Chongmin Wang, Yingge Du
Changes in structure and composition resulting from oxygen deficiency can strongly impact the physical and chemical properties of transition metal oxides, which may lead to new functionalities for novel electronic devices. Oxygen vacancies (Vo) can be readily formed to accomodate the lattice mismatch during epitixial thin film growth. In this paper, the effects of substrate strain and oxidizing power on the creation and distribution of Vo in WO3-δ thin films are investigated in detail. An 18 O2 isotope labeled time-of-flight secondary ion mass spectrometry study reveals that WO3-δ films grown on SrTiO3 substrates display a significantly larger oxygen vacancy gradient along the growth direction compared to those grown on LaAlO3 substrates...
April 25, 2018: ACS Applied Materials & Interfaces
Ashley N Yeager, Peter K Weber, Mary L Kraft
Information about the distributions of cholesterol and sphingolipids within the plasma membranes of mammalian cells provides insight into the roles of these molecules in membrane function. In this report, high-resolution secondary ion mass spectrometry was used to image the distributions of metabolically incorporated rare isotope-labeled sphingolipids and cholesterol on the surfaces of nonpolarized epithelial cells. Sphingolipid domains that were not enriched with cholesterol were detected in the plasma membranes of subconfluent Madin-Darby canine kidney cells...
April 20, 2018: Biochimica et Biophysica Acta
E Gibbin, A Gavish, I Domart-Coulon, E Kramarsky-Winter, O Shapiro, A Meibom, A Vardi
BACKGROUND: Global warming has triggered an increase in the prevalence and severity of coral disease, yet little is known about coral/pathogen interactions in the early stages of infection. The point of entry of the pathogen and the route that they take once inside the polyp is currently unknown, as is the coral's capacity to respond to infection. To address these questions, we developed a novel method that combines stable isotope labelling and microfluidics with transmission electron microscopy (TEM) and nanoscale secondary ion mass spectrometry (NanoSIMS), to monitor the infection process between Pocillopora damicornis and Vibrio coralliilyticus under elevated temperature...
April 20, 2018: BMC Microbiology
Vilas B Gade, Anandarup Goswami, Rajender S Varma, Sharad N Shelke, Manoj B Gawande
Efficient and general protocols for the O - tert -boc protection and O -arylation of phenols were developed in this paper using a recyclable magnetic Fe₃O₄-Co₃O₄ nanocatalyst (Nano-Fe-Co), which is easily accessible via simple wet impregnation techniques in aqueous mediums from inexpensive precursors. The results showed the catalysts were well characterized by XRD (X-ray Diffraction), ICP-AES (Inductive Coupled Plasma Atomic Emission Spectroscopy), TEM (Transmission Electron Microscopy), TOF-SIMS (Time-Of-Flight Secondary Ion Mass Spectrometry) and XPS (X-ray Photoelectron Spectroscopy)...
April 17, 2018: Nanomaterials
Ran Lu, Caiyun Wang, Xin Wang, Yuji Wang, Na Wang, Joshua Chou, Tao Li, Zhenting Zhang, Yunhan Ling, Su Chen
Background: Modified titanium (Ti) substrates with titanium dioxide (TiO2 ) nanotubes have broad usage as implant surface treatments and as drug delivery systems. Methods: To improve drug-loading capacity and accelerate bone integration with titanium, in this study, we hydrogenated anodized titanium dioxide nanotubes (TNTs) by a thermal treatment. Three groups were examined, namely: hydrogenated TNTs (H2 -TNTs, test), unmodified TNTs (air-TNTs, control), and Ti substrates (Ti, control)...
2018: International Journal of Nanomedicine
Paola Donato, Giuseppe Micalizzi, Marianna Oteri, Francesca Rigano, Danilo Sciarrone, Paola Dugo, Luigi Mondello
The task of lipid analysis and profiling is taking centre stage in many research fields and as a consequence, there has been an intense effort to develop suitable methodologies to discover, identify, and quantify lipids in the systems investigated. Given the high complexity and diversity of the lipidome, researchers have been challenged to afford thorough knowledge of all the lipid species in a given sample, by gathering the data obtained by complementary analytical techniques. In this research, an "omic" approach was developed to quickly fingerprint lipids in the Mediterranean mussel (Mytilus galloprovincialis), by exploiting multidimensional and hyphenated techniques...
April 17, 2018: Analytical and Bioanalytical Chemistry
Eder Alves Barbosa, Mauro Ferreira Bonfim Junior, Carlos Bloch, Thales Lima Rocha, Gilbert Engler, Janice de Almeida Engler
Nematodes are devastating pests that infect most cultivated plant species and cause considerable agricultural losses worldwide. The understanding of metabolic adjustments induced during plant-nematode interaction is crucial to generate resistant plants or to select more efficient molecules to fight against this pest. Matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) has been used herein for in situ detection and mapping endogenous polypeptides and secondary metabolites from nematode-induced gall tissue...
April 17, 2018: Molecular Plant-microbe Interactions: MPMI
Vahid Mirshafiee, Brendan A C Harley, Mary L Kraft
Characterization of the heterogeneity within stem cell populations, which affects their differentiation potential, is necessary for the design of artificial cultures for stem cell expansion. In this study, we assessed whether self-organizing maps (SOMs) of single cell time-of-flight secondary ion mass spectrometry (TOF-SIMS) data provide insight into the spectral, and thus the related functional heterogeneity between and within three hematopoietic cell populations. SOMs were created of TOF-SIMS data from individual hematopoietic stem and progenitor cells (HSPCs), lineage-committed common lymphoid progenitors (CLPs), and fully differentiated B cells that had been isolated from murine bone marrow via conventional flow cytometry...
March 16, 2018: Tissue Engineering. Part C, Methods
Qi Jia, Dan Li, Xinlu Wang, Shuming Yang, Yongzhong Qian, Jing Qiu
A sensitive method for simultaneous determination of amantadine and rimantadine in feed was developed using an ultra-high-performance liquid chromatography-triple quadrupole linear ion trap mass spectrometry (UHPLC-Qtrap-MS) in the multiple reaction monitoring information-dependent acquisition-enhanced product ion (MRM-IDA-EPI) mode, and employing the mixed cation exchange (MCX) solid-phase extraction column as sample cleanup and amantadine-d15 and rimantadine-d4 as internal standards, respectively. Compared to traditional MRM mode, for the targeted drugs in feed simultaneously both the secondary mass spectra and MRM information can be obtained using UHPLC-Qtrap-MS with MRM-IDA-EPI mode, and thus more accurate qualitative confirmation results achieved even at lower concentration of 0...
April 13, 2018: Analytical and Bioanalytical Chemistry
Kyung Min Kim, Yun-Sik Nam, Yeonhee Lee, Kang-Bong Lee
A highly sensitive and selective colorimetric assay for the detection of Hg2+ ions was developed using gold nanoparticles (AuNPs) conjugated with polyethyleneimine (PEI). The Hg2+ ion coordinates with PEI, decreasing the interparticle distance and inducing aggregation. Time-of-flight secondary ion mass spectrometry showed that the Hg2+ ion was bound to the nitrogen atoms of the PEI in a bidentate manner (N-Hg2+ -N), which resulted in a significant color change from light red to violet due to aggregation. Using this PEI-AuNP probe, determination of Hg2+ ion can be achieved by the naked eye and spectrophotometric methods...
2018: Journal of Analytical Methods in Chemistry
Mohammad A M Momin, Ian G Tucker, Colin S Doyle, John A Denman, Shyamal C Das
This study aimed to develop dry powder particles with surfaces enriched in hydrophobic material by manipulation of spray-drying conditions and to investigate the effect of hydrophobic surface enrichment on aerosolization of hygroscopic drug. The composite dry powder formulations of kanamycin (hygroscopic drug) and rifampicin (hydrophobic drug) were produced by systematically (23 full factorial design) varying the drug ratio, co-solvent composition and inlet temperature using Buchi B-290 Mini Spray-Dryer. All the composite powder particles were inhalable in size (3...
April 4, 2018: International Journal of Pharmaceutics
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