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https://www.readbyqxmd.com/read/29790532/brimstone-chemistry-under-laser-light-assists-mass-spectrometric-detection-and-imaging-the-distribution-of-arsenic-in-minerals
#1
Swapnil Lal, Zhaoyu Zheng, Julius Pavlov, Athula B Attygalle
Singly charged As2n+1 ion clusters (n = 2-11) were generated from elemental arsenic by negative-ion laser-ablation mass spectrometry. The overall abundance of the gaseous As ions generated upon laser irradiation was enhanced nearly a hundred times when As-bearing samples were admixed with sulfur. However, sulfur does not act purely as an inert matrix: irradiating arsenic-sulfur mixtures revealed a novel pathway to generate and detect a series of [AsSn]- clusters (n = 2-6). Intriguingly, the spectra recorded from As2O3, NaAsO2, Na3AsO4, cacodylic acid and 3-amino-4-hydroxyphenylarsonic acid together with sulfur as the matrix were remarkably similar to that acquired from an elemental arsenic and sulfur mixture...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29790525/dna-decorated-cu-9-s-5-nanoparticles-as-nir-light-responsive-drug-carriers-for-tumor-chemo-phototherapy
#2
Shuang Liang, Zhongxi Xie, Yi Wei, Ziyong Cheng, Yanqiu Han, Jun Lin
Recently, near-infrared (NIR) light responsive drug delivery systems have attracted much attention for tumor therapy. Herein, we have successfully constructed a smart nanocarrier system Cu9S5-PEI-DNA-DOX (labelled as CPD-DOX) based on the self-assembly of hydrophobic Cu9S5 nanoparticles (NPs), poly(ethylene imine) (PEI), double-stranded DNA (dsDNA) segments and the anti-cancer drug doxorubicin (DOX). Among them, Cu9S5 NPs can serve as a nano-transducer for absorbing and converting near-infrared light to heat...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29787949/liquid-phase-laser-ablation-synthesis-of-graphene-quantum-dots-from-carbon-nano-onions-comparison-with-chemical-oxidation
#3
Rosemary L Calabro, Dong-Sheng Yang, Doo Young Kim
Graphene quantum dots (GQDs) have been synthesized reproducibly by chemical oxidation (CO) of carbon nano-onions (nCNOs) and a one-step pulsed laser ablation (LA) of nCNOs in deionized water. The photoluminescence (PL) spectra show that the LA-GQDs have blue shifted emission relative to the CO-GQDs which is attributed to the effects of both particle sizes and surface functional groups. The CO-GQDs have an average diameter of 4.1(8) nm and a thickness corresponding to two or three graphene layers, while the LA-GQDs have an average diameter of 1...
May 9, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29787247/enhanced-photogeneration-of-reactive-oxygen-species-and-targeted-photothermal-therapy-of-c6-glioma-brain-cancer-cells-by-folate-conjugated-gold-photoactive-polymer-nanoparticles
#4
Jaber Keyvan Rad, Ali Reza Mahdavian, Samideh Khoei, Sakine Shirvalilou
Tumor-selective photodynamic therapy is a successful method for ablation of malignant and cancerous cells. Herein, we introduce the design and preparation of functionalized acrylic copolymer nanoparticles with spiropyran (SP) and imidazole groups through a facile semi-continuous emulsion polymerization. Then, Au3+ ions were immobilized and reduced on their surface to obtain photoresponsive gold-decorated polymer nanoparticles (PGPNPs). The prepared PGPNPs were surface-modified with folic acid as a site-specific tumor cell targeting agent and improve intracellular uptake via endocytosis...
May 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29785300/corneal-stability-following-hyperopic-lasik-with-advanced-laser-ablation-profiles-analyzed-by-a-light-propagation-study
#5
Almutez M Gharaibeh, Asier Villanueva, David Mas, Julian Espinosa, Jorge L Alió
Purpose: To assess anterior corneal surface stability 12 months following hyperopic LASIK correction with a light propagation algorithm. Setting: Vissum Instituto Oftalmológico de Alicante, Universidad Miguel Hernández, Alicante, Spain. Methods: This retrospective consecutive observational study includes 37 eyes of 37 patients treated with 6th-generation excimer laser platform (Schwind Amaris). Hyperopic LASIK was performed in all of them by the same surgeon (JLA) and completed 12-month follow-up...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29784487/localization-of-ventricular-arrhythmias-for-catheter-ablation-the-role-of-surface-electrocardiogram
#6
REVIEW
Domenico Giovanni Della Rocca, Carola Gianni, Sanghamitra Mohanty, Chintan Trivedi, Luigi Di Biase, Andrea Natale
The surface ECG is a valuable mapping tool in patients with idiopathic and scar-related ventricular arrhythmias (VAs). A detailed analysis of 12-lead ECG can provide useful information in localizing the VA site of origin. This might help tailoring the ablation strategy to optimize procedural duration, increase the probability of success, and prevent complications. The aim of this article is to review the ECG features of both idiopathic and scar-related VAs and discuss their potential implications for optimizing the ablation strategy...
June 2018: Cardiac Electrophysiology Clinics
https://www.readbyqxmd.com/read/29782689/common-and-distinctive-electrocardiographic-characteristics-and-effective-catheter-ablation-of-idiopathic-ventricular-arrhythmias-originating-from-different-areas-of-ventricular-septum-adjacent-to-atrioventricular-annulus
#7
Su-Qin Zhang, Cheng Zheng, Yue-Chun Li, Kang-Ting Ji, Ri-Peng Yin, Jia-Feng Lin, Jia Li
OBJECTIVE: To investigate electrocardiographic (ECG) characteristics and radiofrequency catheter ablation (RFCA) efficacy for premature ventricular complexes (PVCs) and idiopathic ventricular tachycardias (IVTs) originating from ventricular septum areas adjacent to atrioventricular annulus (VS-AVA). METHODS: Among 1505 consecutive PVCs/IVTs cases, 106 (7.04%) were confirmed as origin of VS-AVA guided by both fluoroscopy and three-dimensional mapping system during RFCA...
May 21, 2018: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/29777384/contribution-of-different-tarsal-attachment-devices-to-the-overall-attachment-ability-of-the-stink-bug-nezara-viridula
#8
Gianandrea Salerno, Manuela Rebora, Alexander Kovalev, Elena Gorb, Stanislav Gorb
The tarsal attachment devices of the southern green stink bug Nezara viridula, a cosmopolitan pest of different crops, encompass a pair of claws, distal pretarsal smooth pulvilli, and a proximal hairy pad on the ventral basitarsus. To evaluate the role of these attachment devices in generating attachment, behavioural experiments testing locomotion of insects with ablated pulvilli, shaved hairs and cut-off claws were performed. Using traction force experiments, insect attachment performance was evaluated on artificial substrates characterised by different roughness and on two substrates with different surface energies in the air and under water...
May 17, 2018: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/29773805/new-insights-into-mechanisms-of-material-ejection-in-maldi-mass-spectrometry-for-a-wide-range-of-spot-sizes
#9
Marcel Niehaus, Jens Soltwisch
Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is widely used for the analysis of large biomolecules in numerous applications. The technique utilizes nanosecond-long laser pulses at various spot sizes to eject and ionize large molecules embedded in a highly absorptive chemical matrix. Despite the methods name, 'molecular desorption' from the matrix crystal surface is not the sole mechanism discussed for material ejection in MALDI, but additional ablation of larger clusters has been reported...
May 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29772227/evolutionary-shift-towards-lateral-line-dependent-prey-capture-behavior-in-the-blind-mexican-cavefish
#10
Evan Lloyd, Courtney Olive, Bethany A Stahl, James B Jaggard, Paloma Amaral, Erik R Duboue, Alex C Keene
Feeding strategies are dependent on multi-modal sensory processing, that integrates visual, chemosensory, and mechanoreceptive cues. In many fish species, local environments and food availability dramatically influence the evolution of sensory and morphological traits that underlie feeding. The Mexican cavefish, Astyanax mexicanus, have developed robust changes in sensory-dependent behaviors, but the impact on prey detection and feeding behavior is not known. In the absence of eyes, cavefish have evolved enhanced sensitivity of the lateral line, comprised of mechanosensory organs that sense water flow and detect prey...
May 14, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29770216/assessment-of-a-novel-cryoablation-device-for-the-endovascular-treatment-of-cardiac-tachyarrhythmias
#11
John M Baust, Anthony Robilotto, Peter Guerra, Kristi K Snyder, Robert G Van Buskirk, Marc Dubuc, John G Baust
Objectives: Cryoablation is an effective alternative treatment for cardiac arrhythmias offering shortened recovery and reduced side effects. As the use of cryoablation increases, the need for new devices and procedures has emerged. This has been driven by technological limitations including lengthy periods to generate a single lesion (3-5 min), uncertain transmurality, and differential efficacy. Furthermore, due to limited ablation capacity under high heat loads, cryo has had limited success in the treatment of ventricular arrhythmias...
2018: SAGE Open Medicine
https://www.readbyqxmd.com/read/29767852/membrane-tethered-syntaxin-4-locally-abrogates-e-cadherin-function-and-activates-smad-signals-contributing-to-asymmetric-mammary-epithelial-morphogenesis
#12
Yuina Hirose, Kota Shirai, Yohei Hirai
Spatial and temporal epithelial-mesenchymal transition (EMT) is a critical event for the generation of asymmetric epithelial architectures. We found that only restricted cell populations in the morphogenic mammary epithelia extrude syntaxin-4, a plasmalemmal t-SNARE protein, and that epithelial cell clusters with artificial heterogenic presentation of extracellular syntaxin-4 undergo asymmetric morphogenesis. A previous study revealed that inducible expression of cell surface syntaxin-4 causes EMT-like cell behaviors in the clonal mammary epithelial cells, where laminin-mediated signals were abolished so that cells readily succumb to initiate EMT...
May 16, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29767633/nanopatterning-on-calixarene-thin-films-via-low-energy-field-emission-scanning-probe-lithography
#13
Xiaoyue He, Peng Li, Pengchong Liu, Xiaoxian Zhang, Xiangqian Zhou, Wei Liu, Xiaohui Qiu
Field-emitted, low-energy electrons from the conducting tip of an atomic force microscope were adopted for nanolithography on calixarene ultrathin films coated on silicon wafers. A structural evolution from protrusion to depression down to a 30 nm spatial resolution was reproducibly obtained by tuning the sample voltage and exposure current in the lithography process. Close analyses of the profiles showed that the nanostructures formed by a single exposure with a high current are almost identical to those created by cumulative exposure with a lower current but an equal number of injected electrons...
May 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29767499/large-area-%C3%AE-cu2s-particles-stacked-nanorod-arrays-by-laser-ablation-in-liquid-and-their-strongly-structurally-enhanced-and-stable-visible-photoelectric-performances
#14
Haoming Bao, Hongwen Zhang, Le Zhou, Hao Fu, Guangqiang Liu, Yue Li, Weiping Cai
A flexible route is developed for fabrication of large area α-Cu2S nanorod arrays (NRAs) based on one step laser ablating a copper foil in CS2 liquid. It has been demonstrated that the obtained products are the high temperature phase α-Cu2S and consist of the nanorods vertically standing on the Cu foil, exhibiting the array. The nanorods were about 1 μm in length and around 100 nm in thickness, and built by stacking the nearly spherical and <110>-oriented nanoparticles (NPs) up. Such array can be peeled off from the foil and free-standing...
May 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29762622/charge-switchable-nanocapsules-with-multistage-ph-responsive-behaviours-for-enhanced-tumour-targeted-chemo-photodynamic-therapy-guided-by-nir-mr-imaging
#15
Jia Zhou, Tianliang Li, Chunlei Zhang, Junyuan Xiao, Daxiang Cui, Yingsheng Cheng
Multifunctional nanoplatforms have been developed into advanced drug delivery systems for cancer therapy. In this study, we report a charge-switchable nanocapsule with multistage pH-responsive behaviors. First, DOX-encapsulated and oleylamine-embedded hollow structures with a diameter of 132 ± 21 nm are prepared via the double emulsion method. Subsequently, the hollow structures are encompassed by Gd-DTPA-, chlorin e6 (Ce6)-, and folate (FA)-modified BSA to form tumour-targeted, dual NIR/MR imaging-guided and chemo-photodynamic therapeutic nanoplatforms...
May 15, 2018: Nanoscale
https://www.readbyqxmd.com/read/29762594/flexible-binary-phase-photon-sieves-on-polyimide-substrates-by-laser-ablation
#16
Matthew N Julian, David G MacDonnell, Mool C Gupta
A binary phase diffractive optical element photon sieve is fabricated by direct laser ablation of a thin, flexible polyimide substrate with a nanosecond-pulsed ultraviolet laser. The binary phase photon sieve operates at 633 nm and was designed with 19 rings and a focal length of 400 mm. The total time to fabricate the photon sieves was tens of seconds. The surface properties of the laser-processed areas are examined, and the optical performance of the photon sieve is characterized and compared to FDTD simulations...
May 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29760744/mst1-regulates-post-infarction-cardiac-injury-through-the-jnk-drp1-mitochondrial-fission-pathway
#17
Xisong Wang, Qing Song
Background: Post-infarction cardiac injury is closely associated with cardiac remodeling and heart dysfunction. Mammalian STE20-like kinase 1 (Mst1), a regulator of cellular apoptosis, is involved in cardiac remodeling in post-infarction heart, but the mechanisms remain poorly defined. We aimed to explore the role of Mst1 in regulating chronic post-infarction cardiac injury, with a focus on mitochondrial homoeostasis. Methods: Wild-type (WT) and Mst1-knockout mice were as the cardiac myocardial infarction model...
2018: Cellular & Molecular Biology Letters
https://www.readbyqxmd.com/read/29760550/synergistic-antifungal-effect-of-chitosan-stabilized-selenium-nanoparticles-synthesized-by-pulsed-laser-ablation-in-liquids-against-candida-albicans-biofilms
#18
Humberto H Lara, Gregory Guisbiers, Jonathan Mendoza, Lawrence C Mimun, Brandy A Vincent, Jose L Lopez-Ribot, Kelly L Nash
Background: Candida albicans is a major opportunistic fungal pathogen. One of the most important virulence factors that contribute to the pathogenesis of candidiasis is its ability to form biofilms. A key characteristic of Candida biofilms is their resistance to antifungal agents. Due to significant morbidity and mortality rates related to biofilm-associated drug resistance, there is an urgency to develop novel nanotechnology-based approaches preventing biofilm-related infections. Methods: In this study, we report, for the first time, the synthesis of selenium nanoparticles by irradiating selenium pellets by nanosecond pulsed laser ablation in liquid chitosan as a capping agent...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29760108/anatomy-of-a-glacial-meltwater-discharge-event-in-an-antarctic-cove
#19
Michael P Meredith, Ulrike Falk, Anna Valeria Bers, Andreas Mackensen, Irene R Schloss, Eduardo Ruiz Barlett, Kerstin Jerosch, Adrián Silva Busso, Doris Abele
Glacial meltwater discharge from Antarctica is a key influence on the marine environment, impacting ocean circulation, sea level and productivity of the pelagic and benthic ecosystems. The responses elicited depend strongly on the characteristics of the meltwater releases, including timing, spatial structure and geochemical composition. Here we use isotopic tracers to reveal the time-varying pattern of meltwater during a discharge event from the Fourcade Glacier into Potter Cove, northern Antarctic Peninsula...
June 28, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29759537/real-time-localization-of-ventricular-tachycardia-origin-from-the-12-lead-electrocardiogram
#20
John L Sapp, Meir Bar-Tal, Adam J Howes, Jonathan E Toma, Ahmed El-Damaty, James W Warren, Paul J MacInnis, Shijie Zhou, B Milan Horáček
OBJECTIVES: The aim of this study was to develop rapid computational methods for identifying the site of origin of ventricular activation from the 12-lead electrocardiogram. BACKGROUND: Catheter ablation of ventricular tachycardia in patients with structural heart disease frequently relies on a substrate-based approach, which may use pace mapping guided by body-surface electrocardiography to identify culprit exit sites. METHODS: Patients undergoing ablation of scar-related VT (n = 38) had 12-lead electrocardiograms recorded during pacing at left ventricular endocardial sites (n = 1,012) identified on 3-dimensional electroanatomic maps and registered to a generic left ventricular endocardial surface divided into 16 segments and tessellated into 238 triangles; electrocardiographic data were reduced for each lead to 1 variable, consisting of QRS time integral...
July 2017: JACC. Clinical Electrophysiology
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