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Diogo Castro Vaz, Edouard Lesne, Anke Sander, Hiroshi Naganuma, Eric Jacquet, Jacobo Santamaria, Agnès Barthélémy, Manuel Bibes
The quasi 2D electron system (q2DES) that forms at the interface between LaAlO3 (LAO) and SrTiO3 (STO) has attracted much attention from the oxide electronics community. One of its hallmark features is the existence of a critical LAO thickness of 4 unit-cells (uc) for interfacial conductivity to emerge. Although electrostatic mechanisms have been proposed in the past to describe the existence of this critical thickness, the importance of chemical defects has been recently accentuated. Here, we describe the growth of metal/LAO/STO heterostructures in an ultra-high vacuum (UHV) cluster system combining pulsed laser deposition (to grow the LAO), magnetron sputtering (to grow the metal) and X-ray photoelectron spectroscopy (XPS)...
February 8, 2018: Journal of Visualized Experiments: JoVE
Chuang Li, Shaohua Jin, Weixiang Guan, Chi-Wing Tsang, Wing-Kin Chu, Wai Kin Lau, Changhai Liang
We demonstrate a method for the synthesis of NixNb1-xO catalysts with sponge-like and fold-like nanostructures. By varying the Nb:Ni ratio, a series of NixNb1-xO nanoparticles with different atomic compositions (x = 0.03, 0.08, 0.15, and 0.20) have been prepared by chemical precipitation. These NixNb1-xO catalysts are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. The study revealed the sponge-like and fold-like appearance of Ni0.97Nb0.03O and Ni0.92Nb0...
February 19, 2018: Journal of Visualized Experiments: JoVE
Tara Nietzold, Bradley M West, Michael Stuckelberger, Barry Lai, Stefan Vogt, Mariana I Bertoni
The quantification of X-ray fluorescence (XRF) microscopy maps by fitting the raw spectra to a known standard is crucial for evaluating chemical composition and elemental distribution within a material. Synchrotron-based XRF has become an integral characterization technique for a variety of research topics, particularly due to its non-destructive nature and its high sensitivity. Today, synchrotrons can acquire fluorescence data at spatial resolutions well below a micron, allowing for the evaluation of compositional variations at the nanoscale...
February 17, 2018: Journal of Visualized Experiments: JoVE
Pavel Hála, Mikuláš Mlček, Petr Ošťádal, David Janák, Michaela Popková, Tomáš Bouček, Stanislav Lacko, Jaroslav Kudlička, Petr Neužil, Otomar Kittnar
A stable and reliable model of chronic heart failure is required for many experiments to understand hemodynamics or to test effects of new treatment methods. Here, we present such a model by tachycardia-induced cardiomyopathy, which can be produced by rapid cardiac pacing in swine. A single pacing lead is introduced transvenously into fully anaesthetized healthy swine, to the apex of the right ventricle, and fixated. Its other end is then tunneled dorsally to the paravertebral region. There, it is connected to an in-house modified heart pacemaker unit that is then implanted in a subcutaneous pocket...
February 17, 2018: Journal of Visualized Experiments: JoVE
Amar S Katkar, Shobhnath P Gupta, Md Motin Seikh, Lih-Juann Chen, Pravin S Walke
The Cr doped tunable thickness core-shell Ge/GeOx nanowires were synthesized and characterized using X-ray diffraction, FESEM, TEM, EDS, XPS and magnetization studies. The shell thickness increases with the increase in synthesis temperature. The presence of metallic Cr and Cr3+ in core-shell structure was confirmed from XPS study. The magnetic property is highly sensitive to the core-shell thickness and intriguing room temperature ferromagnetism is realized only in core-shell nanowires. The magnetization decreases with increase in shell thickness and practically ceases to exist when there is no core...
March 19, 2018: Nanotechnology
Yang Wang, Xueping Kong, Wei Xu, Fengrui Jiang, Bao Li, Lixin Wu
A series of triol ligand [CH3 C(CH2 OH)3 ] covalently decorated polyoxometalates (POMs), which could be ascribed to the primary complexes with structural formulas {M2 [Mo2 O4 (CH3 C(CH2 O)3 )2 ]3 }2- (M = Cu2+ , Co2+ , Ni2+ , Zn2+ ), have been synthesized in organic solvents. Single-crystal X-ray structural analysis reveals that the synthesized polyanionic clusters are comprised of three {Mo2 } units and two divalent transition-metal ions connecting to each other in an alternating style, where all {Mo2 } blocks were covalently decorated by two triol ligands in the trans conformation...
March 19, 2018: Inorganic Chemistry
Renate Kristianslund, Marius Aursnes, Jørn E Tungen, Carl H Görbitz, Trond V Hansen
The two ar-bisabol sesquiterpenoids (+)-sielboldianin A (1) and (+)-sielboldianin B (2) were isolated from the stem bark of the plant Fraxinus sielboldiana and belong to a medicinally interesting class of natural products used in traditional Chinese medicine. Herein the total synthesis of the proposed structure of (+)-sielboldianin A (1) is reported using an organocatalyzed enantioselective bromolactonization protocol. X-ray analysis of a key intermediate together with specific rotation values and NOESY data of the synthesized product enabled the revision of the absolute configuration of the natural product (+)-sielboldianin A to (7 R,10 R)...
March 19, 2018: Journal of Natural Products
Henry H Wilson, Connor A Koellner, Zain M Hannan, Caroline B Endy, Mark W Bezpalko, Nicholas A Piro, W Scott Kassel, Matthew D Sonntag, Christopher R Graves
The synthesis and full characterization of a series of neutral ligand α-diimine complexes of aluminum are reported. The compounds [Al(LAr )2 Cl2 )][AlCl4 ] [LAr = N, N'-bis(4-R-C6 H4 )-2,3-dimethyl-1,4-diazabutadiene] are structurally analogous, as determined by multinuclear NMR spectroscopy and solid-state X-ray diffraction, across a range of electron-donating [R = Me (2),t Bu (3), OMe (4), and NMe2 (5)] and electron-withdrawing [R = Cl (6), CF3 (7), and NO2 (8)] substituents in the aryl side arm of the ligand...
March 19, 2018: Inorganic Chemistry
Po-Chia Chen, Pawel Masiewicz, Vladimir Rybin, Dmitri I Svergun, Janosch Hennig
We present a screening protocol utilizing small-angle X-ray scattering (SAXS) to obtain structural information of biomolecular interactions independent of prior knowledge, so as to complement affinity-based screening and provide leads for further exploration. This protocol categorizes ligand titrations by computing pair-wise agreement between curves, and separately estimates affinities by quantifying complex formation as a departure from the linear sum properties of solution SAXS. The protocol is validated by sparse sequence search around the native poly-uridine RNA motifs of the two-RRM domain Sex-lethal protein (Sxl)...
March 19, 2018: ACS Combinatorial Science
Cumhur Murat Tulay, Sadık Yaldız, Adnan Bilge
PURPOSE: To identify occult pneumothorax with oblique chest X-ray (OCXR) in clinically suspected patients. METHODS: In this retrospective study, we examined 1082 adult multitrauma patients who were admitted to our emergency service between January 2016 and January 2017. Clinical findings that suggest occult pneumothorax were rib fracture, flail chest, chest pain, subcutaneous emphysema, abrasion or ecchymosis and moderate to severe hypoxia in clinical parameters...
March 16, 2018: Annals of Thoracic and Cardiovascular Surgery
Yair Lahav, Yoram Epstein, Ron Kedem, Haggai Schermann
Anthropometric measures of body composition are often used for rapid and cost-effective estimation of percentage body fat (%BF) in field research, serial measurements and screening. Our aim was to develop a validated estimate of %BF for the general population, based on simple body circumferences measures. The study cohort consisted of two consecutive samples of health club members, designated as 'development' (n 476, 61 % men, 39 % women) and 'validation' (n 224, 50 % men, 50 % women) groups. All subjects underwent anthropometric measurements as part of their registration to a health club...
March 2018: British Journal of Nutrition
Antonella Capasso, Rossella Mastroianni, Annalisa Passariello, Marta Palma, Francesco Messina, Antonella Ansalone, Italo Bernardo, Daniela Brescia, Francesco Crispino, Carolina Grassia, Attilio Romano, Gaetano Ausanio
PURPOSE: The neonatologists of Sant'Anna and San Sebastiano Hospital of Caserta have carried out a pilot study investigating the safety, feasibility, and accuracy of intracavitary electrocardiography for neonatal epicutaneous cava catheter tip positioning. PATIENTS AND METHODS: We enrolled 39 neonates (1-28 days of postnatal age or correct age lower than 41 weeks) requiring epicutaneous cava catheter in the district of superior vena cava (head-neck or upper limbs)...
March 1, 2018: Journal of Vascular Access
Hui-Hu Li, Gang Ren, Li-Min Chen, Guo-Yue Zhong
Glues medicines is a special kind of traditional Chinese medicine.As the market demand is large, the raw materials are in short supply and lacks proper quality evaluation technology, which causes inconsistent quality of products on the market. Its authentic identification and evaluation stay a problem to be solved. In this paper, the research progress of the methods and techniques of the evaluation of the identification and quality of glues medicines were reviewed. The researches of medicinal glue type identification and quality evaluation mainly concentrated in four aspects of medicinal materials of physical and chemical properties, trace elements, organic chemicals and biological genetic methods and techniques...
January 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Hussaina Banu, N Renuka, S M Faheem, Raees Ismail, Vinita Singh, Zahra Saadatmand, Saad Sultan Khan, Kavya Narayanan, Alma Raheem, Kumpati Premkumar, Geetha Vasanthakumar
Recently, several attempts have been made to use the phytopharmaceuticals from plant extracts as reducing, capping and stabilizing agents for the biomimetic synthesis of various metal nanoparticles conjugated to the phytopharmaceuticals. These biogenic metal nanoparticles are non-toxic and can be used as contrast agents, drug delivery vehicles and photothermal agents for cancer therapy. Herein, we report the synthesis of both silver and gold nanoparticles using the pollen extract of Phoenix dactylifera (Date Palm), characterization using UV-visible spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy, quantitation of phytochemicals capping the nanoparticles using Folin - Ciocalteu's method, cytotoxicity studies on MCF-7 breast cancer cells, cancer cell death analysis using fluorescent microscopy, and modulation of expression of the pro-apoptotic p53 and anti-apoptotic Bcl-2 proteins...
March 18, 2018: Biological Trace Element Research
Sreejesh Sreedharan, Alessandro Sinopoli, Paul J Jarman, Darren Robinson, Christopher Clemmet, Paul A Scattergood, Craig R Rice, Carl G W Smythe, James A Thomas, Paul I P Elliott
Two new biscyclometalated complexes [Ir(ptzR)2(dppz)]+ (dppz = dipyridophenazene; ptzRH = 4-phenyl-1-benzyl-1,2,3-triazole (1+) and 4-phenyl-1-propyl-1,2,3-triazole (2+)) have been prepared. The hexafluorophosphate salts of these complexes have been fully characterized and, in one case, the X-ray structure of a nitrate salt was obtained. The DNA binding properties of the chloride salts of the complexes were investigated, as well as their cellular uptake by A2780 and MCF7 cell lines. Both complexes display an increase in the intensity of phosphorescence upon titration with duplex DNA, indicating the intercalation of the dppz ligand and, given that they are monocations, the complexes exhibit appreciable DNA binding affinity...
March 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Vera Spatenkova, Pavlina Krejzarova, Jaroslav Jedlicka
Introduction: Dysphagia is a risk factor for aspiration pneumonia and acute respiratory failure in acute stroke patients. Dysphagia lusoria is caused by compression on the esophagus from artery lusoria, when the aberrant right subclavian artery arises from the descending aortic arch. We present a rare case report of pre-stroke undiagnosed dysphagia lusoria as a cause of aspiration pneumonia with acute respiratory failure in a 67-year-old female patient admitted with a minor left intracerebral hemorrhage in the left basal ganglia...
2018: SAGE Open Medical Case Reports
Tennessee D Park, Joshua M Enyart, Terrence E Goyke, Marna Rayl Greenberg
A 23-year-old man was transported to a trauma center after injuring himself while snowboarding. He presented with bilateral shoulder pain and associated deformity to both shoulders. His exam was otherwise unremarkable, and his x-rays confirmed bilateral shoulder dislocations. Cunningham and external rotation without sedation and analgesia techniques were unsuccessful even with local anesthesia to the joint. Subsequent bilateral reduction was successful with moderate sedation using the Milch technique. Simultaneous anterior bilateral shoulder dislocations are rare and providers may need to adjust their techniques to accommodate this unusual presentation...
February 2018: Radiology Case Reports
Siyuan Luo, Maxime A Siegler, Elisabeth Bouwman
Four dimeric nickel(II) complexes [Ni2 Cl2 (BnC2 S)2 ] [ 1 ], [Ni2 Cl2 (BnC3 S)2 ] [ 2 ], [Ni2 (PyC2 S)2 ]Br2 [ 3 ]Br2 , and [Ni2 (PyC3 S)2 ]Br2 [ 4 ]Br2 of four different thiolate-functionalized N-heterocyclic carbene (NHC) ligands were synthesized, and their structures have been determined by single-crystal X-ray crystallography. The four ligands differ by the alkyl chain length between the thiolate group and the benzimidazole nitrogen (two -C2 - or three -C3 - carbon atoms) and the second functionality at the NHC being a benzyl (Bn) or a pyridylmethyl (Py) group...
March 12, 2018: Organometallics
Stefanie Klein, Marc Wegmann, Luitpold V R Distel, Winfried Neuhuber, Carola Kryschi
Silicon nanoparticles with sizes between were synthesized through wet-chemistry procedures using diverse phase transfer reagents. On the other hand, the preparation of iron-doped silicon nanoparticles was carried out using the precursor Na4 Si4 containing 5% Fe. Biocompatibility of all silicon nanoparticle samples was achieved by surface-stabilizing with (3-aminopropyl)triethoxysilane. These surface structures provided positive surface charges which facilitated electrostatic binding to the negatively charged biological membranes...
March 15, 2018: Biochemical and Biophysical Research Communications
Ravikant Jain, Nikhil Jain, Tanveer Sheikh, Charanjeet Yadav
PURPOSE: Wrist has a complex anatomy and undergoes complex injuries. Scaphoid fracture is one of such injuries. It is the most common fracture in carpal bone. Most of the scaphoid fractures are missed on initial X-rays. Magnetic resonance imaging (MRI) is considered as a gold standard for diagnosing scaphoid fractures. Ultrasonography (USG) is emerging as a good alternative to make an early diagnosis of scaphoid fractures. Our aim is to throw light upon the role of USG in detection of scaphoid fractures...
January 31, 2018: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
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