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https://www.readbyqxmd.com/read/28430259/impact-of-assisting-atmospheric-pressure-plasma-on-the-formation-of-micro-and-nanoparticles-during-picosecond-laser-ablation-of-titanium
#1
Stefan Grottker, Wolfgang Viöl, Christoph Gerhard
In this work, we investigated the generation of particles during pure laser and plasma-assisted laser ablation of titanium. Experiments were performed using a NIR picosecond laser at a wavelength of 1030 nm and a pulse duration of 8 ps. For plasma-assisted ablation, an atmospheric pressure dielectric barrier discharge plasma was applied where the process gas was argon. Quantitative particle distributions at sizes from 10 nm to 10 μm were determined. In addition, we evaluated the amount of ablated material via laser scanning microscopy...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429782/electrochemical-generation-of-sulfur-vacancies-in-the-basal-plane-of-mos2-for-hydrogen-evolution
#2
Charlie Tsai, Hong Li, Sangwook Park, Joonsuk Park, Hyun Soo Han, Jens K Nørskov, Xiaolin Zheng, Frank Abild-Pedersen
Recently, sulfur (S)-vacancies created on the basal plane of 2H-molybdenum disulfide (MoS2) using argon plasma exposure exhibited higher intrinsic activity for the electrochemical hydrogen evolution reaction than the edge sites and metallic 1T-phase of MoS2 catalysts. However, a more industrially viable alternative to the argon plasma desulfurization process is needed. In this work, we introduce a scalable route towards generating S-vacancies on the MoS2 basal plane using electrochemical desulfurization. Even though sulfur atoms on the basal plane are known to be stable and inert, we find that they can be electrochemically reduced under accessible applied potentials...
April 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28422070/one-year-follow-up-risk-assessment-in-skh-1-mice-and-wounds-treated-with-an-argon-plasma-jet
#3
Anke Schmidt, Thomas von Woedtke, Jan Stenzel, Tobias Lindner, Stefan Polei, Brigitte Vollmar, Sander Bekeschus
Multiple evidence in animal models and in humans suggest a beneficial role of cold physical plasma in wound treatment. Yet, risk assessment studies are important to further foster therapeutic advancement and acceptance of cold plasma in clinics. Accordingly, we investigated the longterm side effects of repetitive plasma treatment over 14 consecutive days in a rodent full-thickness ear wound model. Subsequently, animals were housed for 350 days and sacrificed thereafter. In blood, systemic changes of the proinflammatory cytokines interleukin 1β and tumor necrosis factor α were absent...
April 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28415177/influence-of-atomic-kinetics-in-the-simulation-of-plasma-microscopic-properties-and-thermal-instabilities-for-radiative-bow-shock-experiments
#4
G Espinosa, R Rodríguez, J M Gil, F Suzuki-Vidal, S V Lebedev, A Ciardi, J G Rubiano, P Martel
Numerical simulations of laboratory astrophysics experiments on plasma flows require plasma microscopic properties that are obtained by means of an atomic kinetic model. This fact implies a careful choice of the most suitable model for the experiment under analysis. Otherwise, the calculations could lead to inaccurate results and inappropriate conclusions. First, a study of the validity of the local thermodynamic equilibrium in the calculation of the average ionization, mean radiative properties, and cooling times of argon plasmas in a range of plasma conditions of interest in laboratory astrophysics experiments on radiative shocks is performed in this work...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28411539/microwave-atmospheric-pressure-plasma-jets-for-wastewater-treatment-degradation-of-methylene-blue-as-a-model-dye
#5
María C García, Manuel Mora, Dolores Esquivel, John E Foster, Antonio Rodero, César Jiménez-Sanchidrián, Francisco J Romero-Salguero
The degradation of methylene blue in aqueous solution as a model dye using a non thermal microwave (2.45 GHz) plasma jet at atmospheric pressure has been investigated. Argon has been used as feed gas and aqueous solutions with different concentrations of the dye were treated using the effluent from plasma jet in a remote exposure. The removal efficiency increased as the dye concentration decreased from 250 to 5 ppm. Methylene blue degrades after different treatment times, depending on the experimental plasma conditions...
April 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28410629/conservative-management-of-massive-pneumoperitoneum-after-argon-plasma-coagulation
#6
Laura Fernández Gómez-Cruzado, Mikel Prieto Calvo, Eva Alonso Calderón, Jasone Larrea Oleaga, Teresa Marquina Tobalina
No abstract text is available yet for this article.
April 11, 2017: Cirugía Española
https://www.readbyqxmd.com/read/28405537/vascular-air-embolism-during-bronchoscopy-procedures-incidence-pathophysiology-diagnosis-management-and-outcomes
#7
REVIEW
Venkatkiran Kanchustambham, Swetha Saladi, Kris Mehta, John Mwangi, Zafar Jamkhana, Setu Patolia
Vascular air embolism (VAE) is a rare, but potentially fatal complication of invasive medical or surgical procedures. It is a very rare complication of bronchoscopy and is most frequently reported with therapeutic bronchoscopy with Argon plasma coagulation (APC) or neodymium-doped yttrium aluminum garnet (Nd-YAG) laser. Despite being rare, as a result of its high chance of mortality and morbidity, it is imperative that physicians have high clinical suspicion to allow for early recognition and treatment. In this article, we provide a concise review of the incidence, pathophysiology, diagnosis management and outcomes of air embolism during bronchoscopy procedures...
March 9, 2017: Curēus
https://www.readbyqxmd.com/read/28405318/argon-plasma-coagulation-compared-with-stent-placement-in-the-palliative-treatment-of-inoperable-oesophageal-cancer
#8
Dimitrios E Sigounas, Christoforos Krystallis, Graeme Couper, Simon Paterson-Brown, Athina Tatsioni, John N Plevris
BACKGROUND: Self-expandable metal stents (SEMSs) are the main palliative modality used in inoperable oesophageal cancer. Other palliative modalities, including argon plasma coagulation (APC), have also been used. OBJECTIVE: The purpose of this study was to assess the relative efficacy of SEMS and APC regarding the survival of patients with inoperable oesophageal cancer, not receiving chemo/radiotherapy. METHODS: Single centre, retrospective analysis of all patients (n = 228) with inoperable oesophageal cancer between January 2000 and July 2014, not receiving chemo-radiotherapy, treated with SEMS (n = 160) or APC (n = 68) as primary palliation modalities...
February 2017: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/28405153/esophageal-squamous-papillomas-with-focal-dermal-hypoplasia-and-eosinophilic-esophagitis
#9
Eric A Pasman, Theresa A Heifert, Cade M Nylund
Focal dermal hypoplasia (FDH) is a rare disorder of the mesodermal and ectodermal tissues. Here we present an eight-year-old female known to have FDH who presents with poor weight gain and dysphagia. She was diagnosed with multiple esophageal papillomas and eosinophilic esophagitis. She was successfully treated with argon plasma coagulation and ingested fluticasone propionate, which has not been described previously in a child.
March 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28401996/exploration-and-performance-evaluation-of-microwave-induced-plasma-with-different-discharge-gases-for-ambient-desorption-ionization-mass-spectrometry
#10
Jingwei Yin, Zhongjun Zhao, Xuefang Zhan, Yixiang Duan
RATIONALE: Microwave-induced plasma (MIP) with different discharge gases of argon or helium provides significant plasma-based ambient desorption/ionization sources, which have potential applicability in direct analysis of complex samples without any sample pre-treatment. In this study, experiments were conducted to better understand microwave-induced plasma desorption/ionization (MIPDI) sources and the corresponding ionization mechanisms. METHODS: Emission spectra of microwave-induced argon (MIP-Ar) and helium (MIP-He) plasmas were obtained from the plasma tail flame of a MIP source...
April 12, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28395382/endoscopic-ultrasound-guided-creation-of-a-transgastric-fistula-for-the-management-of-hepatobiliary-disease-in-patients-with-roux-en-y-gastric-bypass
#11
Saowanee Ngamruengphong, Jose Nieto, Rastislav Kunda, Vivek Kumbhari, Yen-I Chen, Majidah Bukhari, Mohamad Hassan El Zein, Renata P Bueno, Gulara Hajiyeva, Amr Ismail, Yamile Haito Chavez, Mouen A Khashab
Background and aims Endoscopic retrograde cholangiopancreatography (ERCP) in patients who have undergone Roux-en-Y gastric bypass (RYGB) is technically challenging. We describe our multicenter experience using lumen-apposing metal stents (LAMSs) to create an endoscopic ultrasound-guided transgastric fistula (EUS-TG) to facilitate peroral ERCP in these patients. Patients and methods Thirteen patients with RYGB who underwent EUS-TG at three tertiary centers were included. EUS was used to guide puncture of the excluded stomach from the gastric pouch or jejunum; a LAMS was placed across the transgastric fistula...
April 10, 2017: Endoscopy
https://www.readbyqxmd.com/read/28382243/anodization-based-process-for-the-fabrication-of-all-niobium-nitride-josephson-junction-structures
#12
Massimiliano Lucci, Ivano Ottaviani, Matteo Cirillo, Fabio De Matteis, Roberto Francini, Vittorio Merlo, Ivan Davoli
We studied the growth and oxidation of niobium nitride (NbN) films that we used to fabricate superconductive tunnel junctions. The thin films were deposited by dc reactive magnetron sputtering using a mixture of argon and nitrogen. The process parameters were optimized by monitoring the plasma with an optical spectroscopy technique. This technique allowed us to obtain NbN as well as good quality AlN films and both were used to obtain NbN/AlN/NbN trilayers. Lift-off lithography and selective anodization of the NbN films were used, respectively, to define the main trilayer geometry and/or to separate electrically, different areas of the trilayers...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28370324/investigation-of-toxicity-and-mutagenicity-of-cold-atmospheric-argon-plasma
#13
T Maisch, A K Bosserhoff, P Unger, J Heider, T Shimizu, J L Zimmermann, G E Morfill, M Landthaler, S Karrer
Cold atmospheric argon plasma is recognized as a new contact free approach for the decrease of bacterial load on chronic wounds in patients. So far very limited data are available on its toxicity and mutagenicity on eukaryotic cells. Thus, the toxic/mutagenic potential of cold atmospheric argon plasma using the MicroPlaSter β(®) , which has been used efficiently in humans treating chronic and acute wounds, was investigated using the XTT assay in keratinocytes and fibroblasts and the HGPRT (hypoxanthine guanine phosphoribosyl transferase) assay with V79 Chinese hamster cells...
April 2017: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/28367587/radiofrequency-ablation-for-gastric-antral-vascular-ectasia-and-radiation-proctitis
#14
Pave Markos, Branko Bilic, Hrvoje Ivekovic, Nadan Rustemovic
Gastric antral vascular ectasia (GAVE) and chronic radiation proctitis (CRP) are well-known causes of repeated gastrointestinal bleeding and iron deficiency anemia. Argon plasma coagulation (APC) is the most common endoscopic therapy used, but some patients need multiple APC sessions. Radiofrequency ablation (RFA) is recently used in GAVE and CRP treatment with promising results. In this case series, we analyzed data for 15 patients with GAVE and 5 patients with CRP that had multiple prior APC treatment. They were treated with RFA HALO 90 catheter (HALO90 Ablation Catheter System; Covidien, GI Solutions, Sunnyvale, CA) in our tertiary referral center...
April 3, 2017: Indian Journal of Gastroenterology: Official Journal of the Indian Society of Gastroenterology
https://www.readbyqxmd.com/read/28350159/in-situ-control-of-oxygen-vacancies-in-taox-thin-films-via-plasma-enhanced-atomic-layer-deposition-for-resistive-switching-memory-applications
#15
Konstantin V Egorov, Dmitry S Kuzmichev, Pavel S Chizhov, Yuri Yu Lebedinskii, Cheol Seong Hwang, Andrey M Markeev
The plasma-enhanced atomic layer deposition (PEALD) process using Ta(OC2H5)5 as a Ta precursor and plasma-activated hydrogen as a reactant for the deposition of TaOx films with a controllable concentration of oxygen vacancies (VO) is reported herein. The VO concentration control was achieved by varying the hydrogen volume fraction of the hydrogen-argon mixture in the plasma, allowing the control of the leakage current density in the tantalum oxide films within the range of 5 orders of magnitude compared with the Ta2O5 film grown via thermal ALD using the identical Ta precursor and H2O...
April 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28349612/efficacy-of-hyperbaric-oxygen-therapy-in-patients-with-radiation-induced-rectal-ulcers-a-report-of-five-cases
#16
Shoichi Yoshimizu, Akiko Chino, Yuji Miyamoto, Fuyuki Tagao, Susumu Iwasaki, Daisuke Ide, Yoshiro Tamegai, Masahiro Igarashi, Shoichi Saito, Junko Fujisaki
For decades, hyperbaric oxygen therapy has been considered a treatment option in patients with chronic radiation-induced proctitis after pelvic radiation therapy. Refractory cases of chronic radiation-induced proctitis include ulceration, stenosis, and intestinal fistulas with perforation. Appropriate treatment needs to be administered. In this study, we assessed the efficacy of hyperbaric oxygen therapy in five patients with radiation-induced rectal ulcers. Significant improvement and complete ulcer resolution was observed in all treated patients; no side effects were reported...
March 28, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28341128/-a-bronchial-mucous-gland-adenoma-resected-by-endoscopic-procedure
#17
C Vergnenègre, J Hureaux, B Morvant, T Urban, T Jeanfaivre
INTRODUCTION: Surgical resection is usually performed for the treatment of endobronchial tumors. This case describes the use of endoscopic resection as an initial treatment, allowing to spare lung parenchyma. CASE REPORT: A patient was admitted to the emergency unit with right lower lobe pneumonia. A thoracic CT-scan and subsequent bronchoscopy revealed an intrabronchial tumor between the right main and intermediate bronchus. Biopsies were non-diagnostic and a PET-scanner did not find any abnormalities...
March 22, 2017: Revue des Maladies Respiratoires
https://www.readbyqxmd.com/read/28329273/is-surgical-resection-superior-to-bronchoscopic-resection-in-patients-with-symptomatic-endobronchial-hamartoma
#18
Sarah M Abdel Hady, Salma E Elbastawisy, Aly S Hassaballa, Hany H Elsayed
A best evidence topic was written according to a structured protocol. The question addressed was: in surgically fit patients with biopsy proven symptomatic endobronchial hamartoma (EH), is surgical resection superior to bronchoscopic resection in terms of outcome. A total of 756 articles were identified using the reported search, of which 8 represented the best evidence to answer the clinical question. The authors, date, journal, country, study type, population, outcomes and key results are tabulated. Three studies included patients who had either bronchoscopic or surgical treatment of EH in the same study...
February 17, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28303583/osteoblast-growth-after-cleaning-of-biofilm-covered-titanium-discs-with-air-polishing-and-cold-plasma
#19
Rutger Matthes, Kathrin Duske, Tewodros Kebede, Christiane Pink, Rabea Schlüter, Thomas von Woedtke, Klaus-Dieter Weltmann, Thomas Kocher, Lukasz Jablonowski
AIM: To investigate the effects of a combined biofilm removal with an optimized air polishing and a cold plasma device on cells in vitro. MATERIALS AND METHODS: A 7-day-old biofilm was removed from rough titanium discs with an air-polishing device with erythritol powder (AP) or with a cold atmospheric pressure argon plasma (CAP) device or in combination of both (AP+CAP). The removal efficacy was evaluated by subsequent cell seeding of osteoblast-like cells (MG-63)...
March 16, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28296389/abrogated-cell-contact-guidance-on-amino-functionalized-microgrooves
#20
Caroline Mörke, Henrike Rebl, Birgit Finke, Manuela Dubs, Peter Nestler, Aissam Airoudj, Vincent Roucoules, Matthias Schnabelrauch, Andreas Körtge, Karine Anselme, Christiane A Helm, J Barbara Nebe
Topographical and chemical features of biomaterial surfaces affect the cell physiology at the interface and are promising tools for the improvement of implants. The dominance of the surface topography on cell behavior is often accentuated. Striated surfaces induce an alignment of cells and their intracellular adhesion-mediated components. Recently, it could be demonstrated that a chemical modification via plasma polymerized allylamine was not only able to boost osteoblast cell adhesion and spreading but also override the cell alignment on stochastically machined titanium...
March 29, 2017: ACS Applied Materials & Interfaces
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