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https://www.readbyqxmd.com/read/28640617/5-methylhydantoin-from-isolated-molecules-in-a-low-temperature-argon-matrix-to-solid-state-polymorphs-characterization
#1
Bernardo A Nogueira, Gulce O Ildiz, João Canotilho, M Ermelinda S Eusébio, Marta Sofia C Henriques, José A Paixão, Rui Fausto
The molecular structure, vibrational spectra and photochemistry of 5-methylhydantoin (C4H6N2O2; 5-MH) were studied by matrix isolation infrared spectroscopy and theoretical calculations at the DFT(B3LYP)/6-311++G(d,p) theory level. The Natural Bond Orbital (NBO) analysis approach was used to study in detail the electronic structure of the minimum energy structure of 5-MH, namely the specific characteristics of the σ and π electronic systems of the molecule, and the stabilizing orbital interactions. UV irradiation of 5-MH isolated in argon matrix resulted in its photofragmentation through a single photochemical pathway, yielding isocyanic acid, ethanimine and carbon monoxide, thus following a pattern already observed before for the parent hydantoin and 1-methylhydantoin molecules...
June 22, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28634331/genotoxicity-and-cytotoxicity-of-the-plasma-jet-treated-medium-on-lymphoblastoid-wil2-ns-cell-line-using-the-cytokinesis-block-micronucleus-cytome-assay
#2
Sung-Ha Hong, Endre J Szili, Michael Fenech, Nishtha Gaur, Robert D Short
Despite growing interest in the application of atmospheric plasma jets as medical treatment strategies, there has been comparatively little research on the potential genotoxic and cytotoxic effects of plasma jet treatment. In this study, we have employed the cytokinesis block micronucleus cytome (CBMN-Cyt) assay with WIL2-NS B lymphoblastoid cells to test the potential genotoxicity, as well as the cytotoxicity, of toxic species generated in cell culture media by an argon (Ar) plasma jet. Elevated levels of cell death (necrosis) and occurrence of chromosomal damage (micronuclei MN, nculeoplasmic bridge NPBs and nuclear bus, Nbuds) were observed when cells were exposed to plasma jet-treated media...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28633847/the-role-of-ultrasound-in-hydrogen-removal-and-microstructure-refinement-by-ultrasonic-argon-degassing-process
#3
Xuan Liu, Cheng Zhang, Zhiqiang Zhang, Jilai Xue, Qichi Le
In this work, the role of ultrasound in hydrogen removal and microstructure refinement by the ultrasonic argon degassing has been fully investigated by the experimental work in water and AZ91-0.4Ca magnesium melt, respectively. Ultrasound is able to break up argon gas into numbers of small bubbles and drive them diving deeply to the bottom of water, which are responsible for the efficient degassing regime of ultrasonic argon process. The argon flowrate plays a dominant role in promoting hydrogen removal effect...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28631111/suffocation-caused-by-plastic-wrap-covering-the-face-combined-with-nitrous-oxide-inhalation
#4
Peter Mygind Leth, Birgitte Schmidt Astrup
Suicide using a combination of a plastic bag over the head and inhalation of a non-irritating gas, such as helium, argon or nitrogen, has been reported in the literature. Here an unusual suicide method in a 17-year old man by suffocation from covering the face with household plastic wrap, combined with nitrous oxide inhalation, is presented. The case was reviewed based on police, autopsy and hospital reports. A PubMed search for scientific literature related to nitrous oxide abuse and suicide by suffocation was performed and our findings discussed in relation to the scientific literature found...
June 19, 2017: Forensic Science, Medicine, and Pathology
https://www.readbyqxmd.com/read/28629214/infrared-studies-of-the-symmetry-changes-of-the-28-sih4-molecule-in-low-temperature-matrices-fundamental-combination-and-overtone-transitions
#5
Ruslan E Asfin, Tatjana D Kolomiitsova, Dmitrii N Shchepkin, Konstantin G Tokhadze
IR spectra of 28SiH4 in argon and nitrogen matrices at low temperature 6.5 - 20 K in the region of overtone and combination transitions were recorded for the first time. Additionally, the high resolution spectra were obtained in the fundamental region. The frequencies and the relative intensities of all bands were determined. The set of experimental data suggests that the symmetry of molecules studied in the matrices is different from the symmetry of the free molecules because of an interaction with the environment...
June 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28629060/enhancing-the-biocompatibility-of-the-polyurethane-methacrylate-and-off-stoichiometry-thiol-ene-polymers-by-argon-and-nitrogen-plasma-treatment
#6
Tiam Foo Chen, Kim Shyong Siow, Pei Yuen Ng, Burhanuddin Yeop Majlis
Our studies focused on improving the biocompatibility properties of two microfluidic prototyping substrates i.e. polyurethane methacrylate (PUMA) and off-stoichiometry thiol-ene (OSTE-80) polymer by Ar and N2 plasma treatment. The contact angle (CA) measurement showed that both plasma treatments inserted oxygen and nitrogen moieties increased the surface energy and hydrophilicity of PUMA and OSTE-80 polymer which corresponded to an increase of nitrogen to carbon ratios (N/C), as measured by XPS, to provide a conducive environment for cell attachments and proliferation...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28625222/a-small-spot-inert-gas-ion-milling-process-as-a-complementary-technique-to-focused-ion-beam-specimen-preparation
#7
Paul E Fischione, Robert E A Williams, Arda Genç, Hamish L Fraser, Rafal E Dunin-Borkowski, Martina Luysberg, Cecile S Bonifacio, András Kovács
This paper reports on the substantial improvement of specimen quality by use of a low voltage (0.05 to ~1 keV), small diameter (~1 μm), argon ion beam following initial preparation using conventional broad-beam ion milling or focused ion beam. The specimens show significant reductions in the amorphous layer thickness and implanted artifacts. The targeted ion milling controls the specimen thickness according to the needs of advanced aberration-corrected and/or analytical transmission electron microscopy applications...
June 19, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28625046/conformational-switching-of-hoco-radical-selective-vibrational-excitation-and-hydrogen-atom-tunneling
#8
Sergey V Ryazantsev, Vladimir I Feldman, Leonid Khriachtchev
Conformers of carboxyl radical have been studied by IR spectroscopy in argon and nitrogen matrices. In an argon matrix, only the lower-energy conformer trans-HOCO is observed, whereas both cis and trans conformers are found for deuterated carboxyl radical DOCO. In a nitrogen matrix, both conformers of HOCO and DOCO isotopologues can be prepared, indicating strong stabilization of the higher-energy cis conformer by a nitrogen matrix. Selective vibrational excitation promotes the trans-to-cis and cis-to-trans conversions of DOCO in an argon matrix and HOCO and DOCO in a nitrogen matrix, which is the first conformational photoswitching of an open-shell species...
June 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28617583/tof-sims-depth-profiling-of-ps-b-pmma-block-copolymers-using-arn-c60-and-cs-sputtering-ions
#9
T Terlier, G Zappalà, C Marie, D Leonard, J-P Barnes, A Licciardello
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) is a high performance tool for molecular depth profiling of polymer films, in particular when they are structured in microphases. However, a major issue is the degradation of polymer materials under ion irradiation in reactions such as cross-linking, chain breaking, or reorganization processes of polymers which have been demonstrated for materials such as polystyrene (PS) and poly(methyl methacrylate) (PMMA). This work aims at comparing ToF-SIMS molecular depth profiling of structured polymers (polystyrene (PS)-b-polymethyl methacrylate (PMMA) block copolymers (BCP)) using either ultralow energy cesium or the more recently introduced C60(++) (under NO dosing and with sample cooling) and argon cluster ion beams (using Ar1500(+) ions at 5 keV)...
June 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28615650/experimental-design-approach-for-deposition-optimization-of-rf-sputtered-chalcogenide-thin-films-devoted-to-environmental-optical-sensors
#10
E Baudet, M Sergent, P Němec, C Cardinaud, E Rinnert, K Michel, L Jouany, B Bureau, V Nazabal
The development of the optical bio-chemical sensing technology is an extremely important scientific and technological issue for diagnosis and monitoring of diseases, control of industrial processes, environmental detection of air and water pollutants. Owing to their distinctive features, chalcogenide amorphous thin films represent a keystone in the manufacture of middle infrared integrated optical devices for a sensitive detection of biological or environmental variations. Since the chalcogenide thin films characteristics, i...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28615135/combined-therapy-for-epistaxis-by-hereditary-hemorrhagic-teleangiectasia-a-3-year-follow-up-study-on-45-patients
#11
Giorgos Papaspyrou, Dietmar Hecker, Maximilian Linxweiler, Bernhard Schick, Basel Al Kadah
Hereditary hemorrhagic telangiectasia (HHT) is a mutilating disease associated with the majority of patients with recurrent epistaxis episodes. The aim of this study was to present a single institution experience with patients treated for nasal epistaxis using a combination of Nd:YAG laser and argon plasma coagulation (APC) vs Nd:YAG laser alone, with a minimum follow-up of 3 years. 45 patients (21 men, 24 women) aged from 15 to 84 years with the diagnosis of HHT were treated in the Department of Otolaryngology, Head and Neck Surgery in Homburg/Saar between 10/2002 and 10/2012 because of epistaxis, using a combination of Nd:YAG laser and APC or Nd:YAG laser alone...
May 24, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28614248/endoscopic-variceal-ligation-induced-ulcer-bleeding-what-are-the-risk-factors-and-treatment-strategies
#12
Eunae Cho, Chung Hwan Jun, Sung Bum Cho, Chang Hwan Park, Hyun Soo Kim, Sung Kyu Choi, Jong Sun Rew
This study was aimed to determine the risk factors of endoscopic variceal ligation-(EVL) induced ulcer bleeding.The prevalence of EVL-induced ulcer bleeding is reported to be 3.6%. However, there are only limited reports of this serious complication, and the risk factors and the treatment methods are not well established.A total of 430 patients who had undergone EVL in Chonnam National University Hospital from January 2014 to October 2016 were studied. EVL was performed for prophylaxis or acute hemorrhage. The patients were classified into 2 groups: a bleeding group (n = 33) and a non-bleeding group (n = 397)...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28614224/a-case-report-of-local-treatment-of-inoperable-squamous-cell-lung-carcinoma-with-convex-probe-endobronchial-ultrasound-guided-intratumoral-injection-of-cisplatin-in-a-patient-with-severe-copd
#13
Xiaochen Li, Xiansheng Liu, Xiaoling Rao, Jianping Zhao, Yongjian Xu, Min Xie
RATIONALE: Endobronchial ultrasound as a powerful diagnostic technology can also be used to perform intratumoral chemotherapy for extraluminal tumor. PATIENT CONCERNS: A 69-year-old man with chronic obstructive pulmonary disease (COPD) presented with worsening dyspnea. A pulmonary function test showed severe airway obstruction and that forced expiratory volume in 1 s was 43% of the predicted value after a bronchodilator. DIAGNOSES: A bronchoscopy and histopathological analyses revealed a squamous cell carcinoma mostly located outside of the lumen with central airway obstruction...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28611555/a-case-of-gastric-antral-vascular-ectasia-which-was-aggravated-by-acid-reducer
#14
Yukiomi Nakade, Tomonori Ozeki, Hiroyuki Kanamori, Tadahisa Inoue, Takaya Yamamoto, Yuji Kobayashi, Norimitsu Ishii, Tomohiko Ohashi, Kiyoaki Ito, Masashi Yoneda
Gastric antral vascular ectasia (GAVE) is known to be characterized by red patches or spots in a diffuse or linear array in the antrum of the stomach. The precise etiology of GAVE remains to be elucidated. Argon plasma laser coagulation (APC) has been used to control oozing from GAVE; however, there is no satisfactory long-term effect of APC in the control of oozing from GAVE. An acid reducer is used after APC because even physiological acid exposure might delay post-APC ulcer healing. We describe the case of a patient who had used an acid reducer and experienced repeated gastrointestinal hemorrhage due to GAVE...
January 2017: Case Reports in Gastroenterology
https://www.readbyqxmd.com/read/28610705/anastomotic-ulcers-in-short-bowel-syndrome-new-suggestions-from-a-multidisciplinary-approach
#15
Fabio Fusaro, Renato Tambucci, Erminia Romeo, Pietro Bagolan, Luigi Dall'Oglio, Stefano Ceccarelli, Paola Francalanci, Dominique Hermans, Andrea Pietrobattista, Antonella Diamanti, Filippo Torroni, Paola De Angelis
BACKGROUND AND AIMS: Anastomotic ulceration (AU) is a rare potential life-threatening complication that may occur after intestinal resection. The diagnosis is often delayed after a long-lasting history of refractory anemia. The pathogenesis remains unknown and there are no established therapies. The aim of the study was to analyze the medical history of children with short bowel syndrome (SBS) who were experiencing AU. METHODS: Records of SBS children were retrospectively reviewed...
June 3, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28609500/morphometric-changes-induced-by-cold-argon-plasma-treatment-on-osteoblasts-grown-on-different-dental-implant-surfaces
#16
Luigi Canullo, Tullio Genova, Pietro Mandracci, Federico Mussano, Roberto Abundo, Joseph P Fiorellini
Treatments for enhancing surface energy were studied in an effort to create a more favorable environment for cell adhesion. Cold argon plasma (CAP) is able to improve titanium-cell contact, producing hydrophilic surfaces with higher wettability. The aim of this in vitro study was to estimate the early cell morphology after CAP treatment of different commercially available titanium surfaces. Surface wettability was significantly augmented in all the treated samples. The authors investigated how CAP affected the behavior of osteoblasts by evaluating the cell morphology outcome...
July 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28609184/use-of-gases-in-dairy-manufacturing-a-review
#17
Bhaskar Mani Adhikari, Tuyen Truong, Nidhi Bansal, Bhesh Bhandari
Use of gases (air, carbon dioxide and nitrogen) has been practiced in the manufacture of dairy products (i.e. ice cream, whipped cream and butter) to improve their texture, mouthfeel and shelf-life extension. Many attempts have also been made to incorporate other gases such as hydrogen, nitrous oxide, argon, xenon, and helium into the dairy systems for various product functionalities such as whipping, foaming, texture, aroma enhancement and therapeutic properties. The gases can be dissolved in aqueous and fat phases or remain in the form of bubbles stabilised by protein or fat particles...
June 13, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28603608/carbonic-acid-monoethyl-ester-as-a-pure-solid-and-its-conformational-isomerism-in-the-gas-phase
#18
Jürgen Bernard, Eva-Maria Köck, Roland G Huber, Klaus R Liedl, Ludwig Call, Robert Schlögl, Hinrich Grothe, Thomas Loerting
The monoesters of carbonic acid are deemed to be unstable and decompose to alcohol and carbon dioxide. In spite of this, we here report the isolation of the elusive carbonic acid monoethyl ester (CAEE) as a pure solid from ethanolic solutions of potassium bicarbonate. The hemiester is surprisingly stable in acidic solution and does not experience hydrolysis to carbonic acid. Furthermore, it is also stable in the gas phase, which we demonstrate by subliming the hemiester without decomposition. This could not be achieved in the past for any hemiester of carbonic acid...
April 21, 2017: RSC Advances
https://www.readbyqxmd.com/read/28595396/mechanism-of-the-fcc-to-hcp-phase-transformation-in-solid-ar
#19
Bingxi Li, Guangrui Qian, Artem R Oganov, Salah Eddine Boulfelfel, Roland Faller
We present an atomistic description of the fcc-to-hcp transformation mechanism in solid argon (Ar) obtained from transition path sampling molecular dynamics simulation. The phase transition pathways collected during the sampling for an 8000-particle system reveal three transition types according to the lattice deformation and relaxation details. In all three transition types, we see a critical accumulation of defects and uniform growth of a less ordered transition state, followed by a homogeneous growth of an ordered phase...
June 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28594330/risk-factors-of-the-rebleeding-according-to-the-patterns-of-nonvariceal-upper-gastrointestinal-bleeding
#20
Ji Hyung Nam, Tae Joo Jeon, Jae Hee Cho, Jae Hak Kim
BACKGROUND/AIMS: Despite of successful endoscopic hemostasis of nonvariceal upper gastrointestinal bleeding (NGIB), rebleeding rate has not decreased. The aim of this study was to identify risk factors for rebleeding after endoscopic hemostasis in patients with NGIB according to bleeding patterns. MATERIALS AND METHODS: A retrospective analysis was performed on the consecutive patients with NGIB in whom successful primary endoscopic hemostasis had been achieved at three university hospitals in Korea...
June 7, 2017: Turkish Journal of Gastroenterology: the Official Journal of Turkish Society of Gastroenterology
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