keyword
https://read.qxmd.com/read/38477517/direct-visualization-of-chemical-transport-in-solid-state-chemical-reactions-by-time-of-flight-secondary-ion-mass-spectrometry
#1
JOURNAL ARTICLE
Sang T Pham, Anh Kiet Tieu, Chao Sun, Shanhong Wan, Sean M Collins
Systematic control and design of solid-state chemical reactions are required for modifying materials properties and in novel synthesis. Understanding chemical dynamics at the nanoscale is therefore essential to revealing the key reactive pathways. Herein, we combine focused ion beam-scanning electron microscopy (FIB-SEM) and time-of-flight secondary ion mass spectrometry (TOF-SIMS) to track the migration of sodium from a borate coating to the oxide scale during in situ hot corrosion testing. We map the changing distribution of chemical elements and compounds from 50 to 850 °C to reveal how sodium diffusion induces corrosion...
March 13, 2024: Nano Letters
https://read.qxmd.com/read/38474503/synthesis-and-morphology-characteristics-of-new-highly-branched-polycaprolactone-pcl
#2
JOURNAL ARTICLE
Aleksandra Zioło, Beata Mossety-Leszczak, Małgorzata Walczak, Beata Strachota, Adam Strachota, Kamil Awsiuk, Natalia Janiszewska, Joanna Raczkowska
A simple and efficient method for the synthesis of biodegradable, highly branched polycaprolactone (PCL) is presented. The solvent-free (bulk) reaction was carried out via ring opening polymerization (ROP), catalyzed by tin octanoate Sn(Oct)2 , and it employed hyperbranched polyamide (HPPA) as a macro-initiator. The core-shell structure of the obtained products (PCL-HPPA), with the hyperbranched HPPA core and linear PCL chains as shell, was in the focus of the product characterization. 1 H nuclear magnetic resonance (1 H NMR) and elemental analysis confirmed the covalent incorporation of the HPPA in the products, as well as a high degree of grafting conversion of its amino functional groups...
February 24, 2024: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/38473477/characteristics-of-the-discoloration-switching-phenomenon-of-4h-sic-single-crystals-grown-by-pvt-method-using-tof-sims-and-micro-raman-analysis
#3
JOURNAL ARTICLE
Seul-Ki Kim, Hajun Kim, Hyun Sik Kim, Tae Eun Hong, Younki Lee, Eun Young Jung
The discoloration switching appearing in the initial and final growth stages of 4H-silicon carbide (4H-SiC) single crystals grown using the physical vapor transport (PVT) technique was investigated. This phenomenon was studied, investigating the correlation with linear-type micro-pipe defects on the surface of 4H-SiC single crystals. Based on the experimental results obtained using time-of-flight secondary ion mass spectrometry (ToF-SIMS) and micro-Raman analysis, it was deduced that the orientation of the 4H-SiC c-axis causes an axial change that correlates with low levels of carbon...
February 22, 2024: Materials
https://read.qxmd.com/read/38456425/negative-electron-transfer-collision-induced-dissociation-of-g-quadruplexes-uncovering-the-guanine-radical-anion-loss-pathway
#4
JOURNAL ARTICLE
Nicole M Brundridge, Jordan M Fritz, Jonathan Dickerhoff, Danzhou Yang, Scott A McLuckey
G-quadruplex (G4) DNA can form highly stable secondary structures in the presence of metal cations, and research has shown its potential as a transcriptional regulator for oncogenes in the human genome. In order to explore the interactions of DNA with metal cations using mass spectrometry, employing complementary fragmentation methods can enhance structural information. This study explores the use of ion-ion reactions for sequential negative electron transfer collision-induced dissociation (nET-CID) as a complement to traditional ion-trap CID (IT-CID)...
March 8, 2024: Journal of the American Society for Mass Spectrometry
https://read.qxmd.com/read/38445417/ho-3-doped-bagd-2-zno-5-green-emitting-phosphor-for-solid-state-lighting-synthesis-characterization-and-photoluminescence-properties
#5
JOURNAL ARTICLE
Irfan Ayoub, Vijay Kumar
In this work, we present the synthesis of a green-emitting series of BaGd2 ZnO5 :xHo3+ (0.5-3 mol%) phosphors using a high-temperature solid-state reaction method. Phase purity and crystal structure information were evaluated through X-ray powder diffraction patterns. Optical properties were examined through diffuse reflectance spectra, revealing that the prepared phosphor exhibited a band gap of 4.65 eV. The effect of Ho3+ doping on the morphology and ion distribution on the surface was assessed using scanning electron microscopy and time-of-flight secondary ion mass spectrometry techniques, respectively...
March 2024: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/38436814/enabling-an-inorganic-rich-interface-via-cationic-surfactant-for-high-performance-lithium-metal-batteries
#6
JOURNAL ARTICLE
Zejun Sun, Jinlin Yang, Hongfei Xu, Chonglai Jiang, Yuxiang Niu, Xu Lian, Yuan Liu, Ruiqi Su, Dayu Liu, Yu Long, Meng Wang, Jingyu Mao, Haotian Yang, Baihua Cui, Yukun Xiao, Ganwen Chen, Qi Zhang, Zhenxiang Xing, Jisheng Pan, Gang Wu, Wei Chen
An anion-rich electric double layer (EDL) region is favorable for fabricating an inorganic-rich solid-electrolyte interphase (SEI) towards stable lithium metal anode in ester electrolyte. Herein, cetyltrimethylammonium bromide (CTAB), a cationic surfactant, is adopted to draw more anions into EDL by ionic interactions that shield the repelling force on anions during lithium plating. In situ electrochemical surface-enhanced Raman spectroscopy results combined with molecular dynamics simulations validate the enrichment of NO3 - /FSI- anions in the EDL region due to the positively charged CTA+ ...
March 4, 2024: Nano-Micro Letters
https://read.qxmd.com/read/38430121/exploring-the-effects-of-cyclosporin-a-to-isocyclosporin-a-rearrangement-on-ion-mobility-separation
#7
JOURNAL ARTICLE
Hynek Mácha, Jakub Zápal, Marek Kuzma, Dominika Luptáková, Karel Lemr, Vladimír Havlíček
Cyclosporin A (CycA) is a peptide secondary metabolite derived from fungi that plays a crucial role in transplantation surgery. Cyclic traveling wave ion mobility mass spectrometry (IM-MS) revealed an N → O peptidyl shift in singly protonated CycA to isocyclosporin A (isoA), whereas no such isomerization was observed for doubly protonated and sodiated molecules. CycA and isoA were able to be separated by considering doubly protonated precursors using a specific ion fragment. In parallel, sodium ion stabilization facilitated the simultaneous separation and quantitation of singly charged cyclosporin isomers with the limit of detection and coefficient of determination of 1...
March 2, 2024: Analytical Chemistry
https://read.qxmd.com/read/38425528/subcellular-protein-turnover-in-human-neural-progenitor-cells-revealed-by-correlative-electron-microscopy-and-nanoscale-secondary-ion-mass-spectrometry-imaging
#8
JOURNAL ARTICLE
Alicia A Lork, Stefania Rabasco, Carl Ernst, André du Toit, Silvio O Rizzoli, Nhu T N Phan
Protein turnover is a critical process for accurate cellular function, in which damaged proteins in the cells are gradually replaced with newly synthesized ones. Many previous studies on cellular protein turnover have used stable isotopic labelling by amino acids in cell culture (SILAC), followed by proteomic bulk analysis. However, this approach does not take into account the heterogeneity observed at the single-cell and subcellular levels. To address this, we investigated the protein turnover of neural progenitor cells at the subcellular resolution, using correlative TEM and NanoSIMS imaging, relying on a pulse-chase analysis of isotopically-labelled protein precusors...
February 28, 2024: Chemical Science
https://read.qxmd.com/read/38422376/molecular-beam-epitaxy-of-%C3%AE-in-x-ga-1-x-2-o-3-on-%C3%AE-ga-2-o-3-010-compositional-control-layer-quality-anisotropic-strain-relaxation-and-prospects-for-two-dimensional-electron-gas-confinement
#9
JOURNAL ARTICLE
Piero Mazzolini, Charlotte Wouters, Martin Albrecht, Andreas Falkenstein, Manfred Martin, Patrick Vogt, Oliver Bierwagen
In this work, we investigate the growth of monoclinic β-(In x Ga1- x )2 O3 alloys on top of (010) β-Ga2 O3 substrates via plasma-assisted molecular beam epitaxy. In particular, using different in situ (reflection high-energy electron diffraction) and ex situ (atomic force microscopy, X-ray diffraction, time-of-flight secondary ion mass spectrometry, and transmission electron microscopy) characterization techniques, we discuss (i) the growth parameters that allow for In incorporation and (ii) the obtainable structural quality of the deposited layers as a function of the alloy composition...
February 29, 2024: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/38416069/high-performance-and-stable-perovskite-x-ray-detection-and-imaging-based-on-a-ti-cathode
#10
JOURNAL ARTICLE
Wenqing Zhang, Hu Wang, Zhilong Chen, Pengxiang Wang, Xin Liu, Hao Dong, Jiaoling Zhao, Yun Cui, Yuchuan Shao
High-energy radiation detectors with a good imaging resolution, fast response, and high sensitivity are desired to operate at a high electric field. However, strong ion migration triggered by electrochemical reactions at the interface between a high-potential electrode and an organic-inorganic hybrid perovskite limits the stability of radiation detectors under a high electric field. Herein, we demonstrate that such ion migration could be effectively suppressed in devices with a Ti cathode, even at a high electric field of 50 V mm-1 , through time-of-flight secondary-ion mass spectrometry...
February 28, 2024: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/38410254/comparison-of-amine-modified-polymeric-stationary-phases-for-polar-metabolomic-analysis-based-on-unified-hydrophilic-interaction-anion-exchange-liquid-chromatography-high-resolution-mass-spectrometry-unified-hilic-aex-hrms
#11
JOURNAL ARTICLE
Kazuki Ikeda, Masatomo Takahashi, Takeshi Bamba, Yoshihiro Izumi
In metabolomic analysis, one of the most commonly used techniques to support the detection sensitivity and quantitation of mass spectrometry is combining it with liquid chromatography. Recently, we developed a method that enables comprehensive single-run measurement of hydrophilic metabolites using unified-hydrophilic interaction/anion exchange liquid chromatography/high-resolution mass spectrometry (unified-HILIC/AEX/HRMS) with a polymer-based mixed amines column (Gelpack GL-HilicAex). However, the importance of stationary phase functional groups and mobile phase conditions for the separation mechanisms and sensitive detection in unified-HILIC/AEX/HRMS is not yet fully understood...
2024: Mass Spectrometry
https://read.qxmd.com/read/38394748/lipid-organization-and-turnover-in-the-plasma-membrane-of-human-differentiating-neural-progenitor-cells-revealed-by-time-of-flight-secondary-ion-mass-spectrometry-imaging
#12
JOURNAL ARTICLE
Emmanuel Berlin, Alicia A Lork, Martin Bornecrantz, Carl Ernst, Nhu T N Phan
Membrane lipids have been known to influence multiple signalling and cellular processes. Dysregulation of lipids at the neuronal membrane is connected to a significant alteration of the brain function and morphology, leading to brain diseases and neurodegeneration. Understanding the lipid composition and turnover of neuronal membrane will provide a significant insight into the molecular events underlying the regulatory effects of these biomolecules in a neuronal system. In this study, we aimed to characterize the composition and turnover of the plasma membrane lipids in human neural progenitor cells (NPCs) at an early differentiation stage into midbrain neurons using ToF-SIMS imaging...
February 14, 2024: Talanta
https://read.qxmd.com/read/38391984/solution-induced-degradation-of-the-silicon-nanobelt-field-effect-transistor-biosensors
#13
JOURNAL ARTICLE
Jung-Chih Lin, Zhao-Yu Zhou, Yi-Ching Cheng, I-Nan Chang, Chu-En Lin, Chi-Chang Wu
Field-effect transistor (FET)-based biosensors are powerful analytical tools for detecting trace-specific biomolecules in diverse sample matrices, especially in the realms of pandemics and infectious diseases. The primary concern in applying these biosensors is their stability, a factor directly impacting the accuracy and reliability of sensing over extended durations. The risk of biosensor degradation is substantial, potentially jeopardizing the sensitivity and selectivity and leading to inaccurate readings, including the possibility of false positives or negatives...
January 25, 2024: Biosensors
https://read.qxmd.com/read/38390149/fine-particulate-matter-from-brick-kilns-site-and-roadside-in-lahore-pakistan-insight-into-chemical-composition-oxidative-potential-and-health-risk-assessment
#14
JOURNAL ARTICLE
Mushtaq Ahmad, Jing Chen, Sirima Panyametheekul, Qing Yu, Asim Nawab, Muhammad Tariq Khan, Yuepeng Zhang, Syed Weqas Ali, Worradorn Phairuang
BACKGROUND: Human health is seriously threatened by particulate matter (PM) pollution, which is a major environmental problem. A better indicator of biological responses to PM exposure than its mass alone is the PM "oxidative potential (OP)," or ability to oxidize target molecules. When reactive oxygen species (ROS) are generated in the OP in excess of the antioxidant capacity of body due to PM components such metals and organic species, it causes inflammation, deoxyribonucleic acid (DNA), proteins, and lipids damage...
February 29, 2024: Heliyon
https://read.qxmd.com/read/38383937/iron-status-and-root-cell-morphology-of-arabidopsis-thaliana-as-modified-by-a-bacterial-ferri-siderophore
#15
JOURNAL ARTICLE
Laure Avoscan, Tristan Lurthy, Jeannine Lherminier, Christine Arnould, Pierre-Manuel Loria, Ting-Di Wu, Jean-Luc Guerquin-Kern, Barbara Pivato, Jean-Paul Lemaître, Philippe Lemanceau, Sylvie Mazurier
We previously provided evidence for the contribution of pyoverdine to the iron nutrition of Arabidopsis. In the present article, we further analyze the mechanisms and physiology of the adaptations underlying plant iron nutrition through Fe(III)-pyoverdine (Fe(III)-pvd). An integrated approach combining microscopy and nanoscale secondary ion mass spectrometry (NanoSIMS) on plant samples was adopted to localize pyoverdine in planta and assess the impact of this siderophore on the plant iron status and root cellular morphology...
2024: Physiologia Plantarum
https://read.qxmd.com/read/38382715/mineralogical-transformation-of-arsenic-at-different-copper-smelting-workshops-the-impact-on-arsenic-bioaccessibility
#16
JOURNAL ARTICLE
Kanghong Feng, Xiaoyun Xu, Qiang Ke, Jiaxin Ding, Ling Zhao, Hao Qiu, Xinde Cao
Soil arsenic (As) contamination associated with the demolition of smelting plants has received increasing attention. Soil As can source from different industrial processes, and also participate in soil weathering, making its speciation rather complex. This study combined the usage of chemical sequential extraction and advanced spectroscopic techniques, e.g., time of flight secondary ion mass spectrometry (ToF-SIMS), to investigate the mineralogical transformation of soil As at different processing sites from a typical copper smelting plant in China...
February 19, 2024: Chemosphere
https://read.qxmd.com/read/38374595/-application-advances-of-mass-spectrometry-imaging-technology-in-environmental-pollutants-analysis-and-their-toxicity-research
#17
REVIEW
Fang Li, Qian Luo
Environmental exposures have significant impacts on human health and can contribute to the occurrence and development of diseases. Pollutants can enter the body through ingestion, inhalation, dermal absorption, or mother-to-child transmission, and can metabolize and/or accumulate in different tissues and organs. These pollutants can recognize and interact with various biomolecules, including DNA, RNA, proteins, and metabolites, disrupting biological processes and leading to adverse effects in living organisms...
February 2024: Se Pu, Chinese Journal of Chromatography
https://read.qxmd.com/read/38365250/dynamic-nitrogen-fixation-in-an-aerobic-endophyte-of-populus
#18
JOURNAL ARTICLE
Andrew W Sher, Jayde A Aufrecht, Daisy Herrera, Amy E Zimmerman, Young-Mo Kim, Nathalie Munoz, Jesse B Trejo, Vanessa L Paurus, John B Cliff, Dehong Hu, William B Chrisler, Robert J Tournay, Emma Gomez-Rivas, Galya Orr, Amir H Ahkami, Sharon L Doty
Biological nitrogen fixation by microbial diazotrophs can contribute significantly to nitrogen availability in non-nodulating plant species. In this study of molecular mechanisms and gene expression relating to biological nitrogen fixation, the aerobic nitrogen-fixing endophyte Burkholderia vietnamiensis, strain WPB, isolated from Populus trichocarpa served as a model for endophyte-poplar interactions. Nitrogen-fixing activity was observed to be dynamic on nitrogen-free medium with a subset of colonies growing to form robust, raised globular like structures...
January 8, 2024: ISME Journal
https://read.qxmd.com/read/38359832/multimodal-mass-spectrometry-imaging-identifies-cell-type-specific-metabolic-and-lipidomic-variation-in-the-mammalian-liver
#19
JOURNAL ARTICLE
Hua Tian, Presha Rajbhandari, Jay Tarolli, Aubrianna M Decker, Taruna V Neelakantan, Tina Angerer, Fereshteh Zandkarimi, Helen Remotti, Gilles Frache, Nicholas Winograd, Brent R Stockwell
Spatial single-cell omics provides a readout of biochemical processes. It is challenging to capture the transient lipidome/metabolome from cells in a native tissue environment. We employed water gas cluster ion beam secondary ion mass spectrometry imaging ([H2 O]n>2 8K -GCIB-SIMS) at ≤3 μm resolution using a cryogenic imaging workflow. This allowed multiple biomolecular imaging modes on the near-native-state liver at single-cell resolution. Our workflow utilizes desorption electrospray ionization (DESI) to build a reference map of metabolic heterogeneity and zonation across liver functional units at tissue level...
February 12, 2024: Developmental Cell
https://read.qxmd.com/read/38356246/spatially-resolved-molecular-analysis-of-host-response-to-medical-device-implantation-using-the-3d-orbisims-highlights-a-critical-role-for-lipids
#20
JOURNAL ARTICLE
Waraporn Suvannapruk, Leanne E Fisher, Jeni C Luckett, Max K Edney, Anna M Kotowska, Dong-Hyun Kim, David J Scurr, Amir M Ghaemmaghami, Morgan R Alexander
A key goal for implanted medical devices is that they do not elicit a detrimental immune response. Macrophages play critical roles in the modulation of the host immune response and are the cells responsible for persistent inflammatory reactions to implanted biomaterials. Two novel immune-instructive polymers that stimulate pro- or anti-inflammatory responses from macrophages in vitro are investigated. These also modulate in vivo foreign body responses (FBR) when implanted subcutaneously in mice. Immunofluorescent staining of tissue abutting the polymer reveals responses consistent with pro- or anti-inflammatory responses previously described for these polymers...
February 14, 2024: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
keyword
keyword
45836
1
2
Fetch more papers »
Fetching more papers... Fetching...
Remove bar
Read by QxMD icon Read
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"

We want to hear from doctors like you!

Take a second to answer a survey question.