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https://www.readbyqxmd.com/read/28530605/screening-of-passiflora-l-mineral-content-using-principal-component-analysis-and-kohonen-self-organizing-maps
#1
Cleber Galvão Novaes, Ivana Lago da Silva Romão, Berlane Gomes Santos, Jéssica Palhares Ribeiro, Marcos Almeida Bezerra, Erik Galvão Paranhos da Silva
A method using digestion with diluted nitric acid and inductively coupled plasma optical emission spectrometry was applied to determine metal ions in the peel, pulp, and seed of Passiflora edulis f. flavicarpa and Passiflora cincinnata cultivated in the Bahia state, Brazil. Plasma parameters (radio frequency power and argon flow rates) were optimized. The quantification limits (µg g(-1)) were: Ca (43.0); Co (1.3); Cu (10.0); Fe (10.0); K (20.0); Mg (26.6); Mn (0.33); Na (56.6) and Zn (10.0). The accuracy of the method was evaluated by the analysis of certified reference materials (NIST 1567a Wheat Flour and NIST 1577b Bovine Liver)...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28527185/surface-heparinization-and-blood-compatibility-modification-of-small-intestinal-submucosa-sis-for-small-caliber-vascular-regeneration
#2
Bensong Han, Feng Xue, Cunyi Fan, Xiumei Mo
OBJECTIVES: This study aims to investigate the small intestinal submucosal (SIS) surface after heparinization with the hypothermia plasma technique, to improve the blood compatibility of SIS, and to explore the possibility of construction of small-caliber vascular grafts with modified SIS scaffolds in vivo. METHODS: SIS films prepared from jejunums of pigs were processed for surface treatment at different time periods with the argon plasma initiation technique under vacuum, and were then immediately immersed in 4% (m/v) heparin sodium solution for 24-h heparinization...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28512304/nearly-perfect-durable-superhydrophobic-surfaces-fabricated-by-a-simple-one-step-plasma-treatment
#3
Jeongeun Ryu, Kiwoong Kim, JooYoung Park, Bae Geun Hwang, YoungChul Ko, HyunJoo Kim, JeongSu Han, EungRyeol Seo, YongJong Park, Sang Joon Lee
Fabrication of superhydrophobic surfaces is an area of great interest because it can be applicable to various engineering fields. A simple, safe and inexpensive fabrication process is required to fabricate applicable superhydrophobic surfaces. In this study, we developed a facile fabrication method of nearly perfect superhydrophobic surfaces through plasma treatment with argon and oxygen gases. A polytetrafluoroethylene (PTFE) sheet was selected as a substrate material. We optimized the fabrication parameters to produce superhydrophobic surfaces of superior performance using the Taguchi method...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28506588/double-balloon-enteroscopy-indications-approaches-diagnostic-and-therapeutic-efficacy-and-safety-early-experience-at-a-single-center
#4
J J E García-Correa, J J Ramírez-García, L F García-Contreras, C Fuentes-Orozco, L Irusteta-Jiménez, L R Michel-Espinoza, A S Carballo Uribe, J A Torres Chávez, A González-Ojeda
INTRODUCTION AND AIMS: Double-balloon enteroscopy has been improving the visualization of the entire intestine for more than a decade. It is a complementary method in the study of intestinal diseases that enables biopsies to be taken and treatments to be administered. Our aim was to describe its main indications, insertion routes, diagnostic/therapeutic efficacy, and complications. MATERIALS AND METHODS: All patients referred to our unit with suspected small bowel pathology were included...
May 12, 2017: Revista de Gastroenterología de México
https://www.readbyqxmd.com/read/28481219/effect-of-argon-flow-on-promoting-boron-doping-for-in-situ-grown-silicon-nitride-thin-films-containing-silicon-quantum-dots
#5
Jia Liu, Bin Liu, Xisheng Zhang, Xiaojia Guo, Shengzhong Frank Liu
Boron-doped silicon nitride thin films (SiNx) containing silicon quantum dots (Si QD) was in-situ prepared by plasma enhanced chemical vapor deposition (PECVD). With the aim at optimizing the performance of thin films, the mixed gas including argon and hydrogen was applied as dilution. The effects of Ar flow on the structural, electrical and optical properties of B-doped SiNx thin films were systemically studied through various characterizations. By tuning the Ar flow, the properties, such as QD size, crystallinity and optical band gap, can be effectively controlled...
May 8, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28479494/gastric-mucosal-devitalization-reduces-adiposity-and-improves-lipid-and-glucose-metabolism-in-obese-rats
#6
Andreas Oberbach, Nadine Schlichting, Marco Heinrich, Yvonne Kullnick, Ulf Retschlag, Stefanie Lehman, Mouen A Khashab, Anthony N Kalloo, Vivek Kumbhari
BACKGROUND AND AIMS: The gastric mucosa is an endocrine organ that regulates satiation pathways by expression of orexigenic and anorexigenic hormones. Vertical sleeve gastrectomy (VSG), excludes gastric mucosa and reduces gastric volume. Our study aims to investigate the independent effects of altering gastric mucosa on obesity and its related comorbidities. METHODS: Gastric mucosal devitalization (GMD) of 70% of the stomach was achieved by argon plasma coagulation in a high-fat diet (HFD) rat model and compared with VSG and sham (SH)...
May 4, 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28449576/dissociative-recombination-of-acetone-fragments-adducts-and-dimer-ions
#7
Suliman Al Shammari, Guilherme C Almeida, Maria Luiza M Rocco, Jean-Luc Le Garrec, J Brian A Mitchell
The room temperature dissociative recombination of ions formed in an acetone/argon plasma has been studied using the flowing afterglow Langmuir probe-mass spectrometer method. By changing the concentration of acetone density, it is possible to have a plasma dominated by different types of ions (fragments, adducts, and dimer ions). The application of these measurements to astrophysical plasmas is discussed.
May 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28446023/removing-biofilms-from-stainless-steel-without-changing-surface-properties-relevant-for-bacterial-attachment
#8
Katharina Huttenlochner, Christine Müller-Renno, Christiane Ziegler, Rolf Merz, Birgit Merz, Michael Kopnarski, Jonas Chodorski, Christin Schlegel, Roland Ulber
The influence of oxygen (and argon) plasma cleaning and a base-acid cleaning procedure on stainless steel surfaces was studied. The main aim was to clean stainless steel samples from Paracoccus seriniphilus biofilms without changing the surface properties which are relevant for bacterial attachment to allow reuse in a biofilm reactor. It is shown that oxygen plasma cleaning, which very successfully removes the same kind of biofilm from titanium surfaces, is not suitable for stainless steel. It largely influences the surface chemistry by producing thick metal oxide layers of varying compositions and changing phenomenological surface properties such as wettability...
April 26, 2017: Biointerphases
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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