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Leila Saedi, Maryam Maskanati, Majede Modheji, Hamed Soleymanabadi
The effect of replacing an Si atom of a silicon nanocone (SiNC) by Al or P atom on its electronic and field emission properties was investigated using density functional theory calculations. Molecular electrostatic potential surface indicates that the electrons do not spread out on the surface of SiNC evenly, and they tend to accumulate more at the apex, facilitating the electron emission from this site. Replacing an Si atom of the apex of nanocone by Al and P atoms is energetically more favorable than that of the wall by about 12...
March 13, 2018: Journal of Molecular Graphics & Modelling
Serdal Okur, Ashwin Krishnan Rishinaramangalam, Saadat Mishkat Ul Masabih, Mohsen Nami, Sheng Liu, Igal Brener, Steve R J Brueck, Daniel Feezell
We investigate the spectrally resolved internal quantum efficiency (IQE) and carrier dynamics in semipolar (101 ̅1) core-shell triangular nanostripe light-emitting diodes (TLEDs) using temperature-dependent photoluminescence (TDPL) and time-resolved photoluminescence (TRPL) at various excitation energy densities. Using electroluminescence (EL), photoluminescence (PL), and cathodoluminescence (CL) measurements, we verify the origins of the broad emission spectra from the nanostructures and confirm that localized regions of high-indium-content InGaN exist along the apex of the nanostructures...
March 20, 2018: Nanotechnology
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
Sarah M Jacobs, Colin P McInnis, Matthew Kapeles, Shu-Hong Chang
PURPOSE: Severe vision loss is a risk of orbital surgery which physicians should counsel patients about, but the overall risk rate is unknown. This research was conducted to determine the risk of severe vision loss related to orbital surgery. DESIGN: Retrospective review. PARTICIPANTS: Patients who underwent orbital surgery at either of 2 academic medical centers between January 1994 and December 2014. METHODS: A billing database search was conducted to identify all patients who had orbital surgery during the study period, cross-checked against diagnostic codes related to vision loss...
March 15, 2018: Ophthalmology
Dubbaka Srujana, Manpreet Kaur, Jayanand Urkude, Anubha Rathi, Namrata Sharma, Jeewan S Titiyal
PURPOSE: To evaluate the functional and anatomical outcomes of repeat penetrating keratoplasty (PK) in optically failed therapeutic grafts. DESIGN: Prospective interventional case series METHODS: All cases admitted at the apex tertiary care centre for repeat keratoplasty following optically failed therapeutic PK were enrolled over a period of one year. Repeat optical PK was performed in all eyes. Primary outcome measures were postoperative graft clarity and visual acuity...
March 14, 2018: American Journal of Ophthalmology
Gülşah Uslu, Taha Özyürek, Koray Yılmaz, Mustafa Gündoğar, Gianluca Plotino
INTRODUCTION: The purpose of this study was to investigate the amount of apically extruded debris by Reciproc Blue (REC Blue; VDW, Munich, Germany), HyFlex EDM (HEDM; Coltene/Whaledent, Altstätten, Switzerland), and XP-endo Shaper (XPS; FKG Dentaire SA, La Chaux-de-Fonds, Switzerland) files during root canal preparation at body temperature. METHODS: Sixty extracted single-rooted mandibular premolar human teeth were randomly assigned to 3 groups (n = 20). The canals were instrumented using 1 of the following instruments: REC Blue, HEDM, or XPS...
March 14, 2018: Journal of Endodontics
Salahaddin Zahedi, Maryam Mostafavi, Neda Lotfirikan
INTRODUCTION: The present study aimed to anatomically assess mandibular posterior teeth using cone-beam computed tomographic (CBCT) imaging for endodontic surgery. METHODS: A total of 170 CBCT scans were evaluated for anatomic variations of mandibular posterior teeth. All the scans were obtained using a Planmeca Promax CBCT unit (Planmeca, Helsinki, Finland) with exposure settings of 90 kVp, 12 mA, 12 seconds, and 0.3-mm resolution. All CBCT images were reconstructed by Romexis Viewer 3...
March 14, 2018: Journal of Endodontics
Unni Krishnan, Paul Monsour, Khaleel Thaha, Ratilal Lalloo, Alex Moule
INTRODUCTION: The aim of this retrospective observational study was to evaluate the cone-beam computed tomographic (CBCT)-based characteristics of the mental foramen (MF), accessory mental foramen (AMF), anterior loop (AL), lateral lingual foramen (LLF), lateral lingual canal (LLC) and to explore any relationships between their characteristics. METHODS: The location and dimension of the MF; the incidence, location, and dimension of the AMF along with its distance to the MF; the presence and dimension of the AL; and the presence, location, angle of entry of the LLF and LLC, and its relation with the mandibular canal (MC) were evaluated in 109 CBCT scans...
March 14, 2018: Journal of Endodontics
Ryota Tamura, Ryosuke Tomio, Farrag Mohammad, Masahiro Toda, Kazunari Yoshida
OBJECTIVE The anterior transpetrosal approach (ATPA) was established in 1984 and has been particularly effective for petroclival tumors. Although some complications associated with this approach, such as venous hemorrhage in the temporal lobe and nervous disturbances, have been resolved over the years, the incidence rate of CSF leaks has not greatly improved. In this study, some varieties of air cell tracts that are strongly related to CSF leaks are demonstrated. In addition, other pre- and postoperative risk factors for CSF leakage after ATPA are discussed...
March 16, 2018: Journal of Neurosurgery
Keiko Fujita, Yoshinao Aoki, Shunji Suzuki
Vitis vinifera cv. Koshu is an indigenous cultivar in Japan and has several characteristics that distinguish it from European V. vinifera. In Japan, Koshu is the most popular cultivar for wine making. We report herein a cell culture established from Koshu for use as a system for the production of resveratrol and its derivatives. Grape cell culture YU-1 was developed from the apex tissues of Koshu. YU-1 growth was favorably compared with BY-2 growth, a standard cell line in plant cell biology. Stilbene production and stilbene synthesis gene expression in YU-1 were upregulated by UV-C irradiation...
March 15, 2018: Cytotechnology
Atul Kabra, Rohit Sharma, Shivali Singla, Ruchika Kabra, Uttam Singh Baghel
BACKGROUND: Myrica esculenta (Family: Myricaceae) commonly known as Kaiphala or Katphala is a widely used medicinal plant in Ayurveda. In spite of its numerous medicinal attributes, no published work is available till date on pharmacognostical characterization and HPTLC analysis of its leaves. OBJECTIVES: To investigate the pharmacognostical, physicochemical, and HPTLC profiles of M. esculenta leaves. MATERIALS AND METHODS: The measures taken for pharmacognostical characterization were organoleptic study, macroscopy, microscopy, powder microscopy, leaf constant, fluorescence analysis, preliminary phytochemical screening and HPTLC spectra profile...
March 12, 2018: Journal of Ayurveda and Integrative Medicine
Jamie S Penk, S Javed H Zaidi, Cheryl A Lefaiver, Supitcha Muangmingsuk, Vivian W Cui, David A Roberson
BACKGROUND: Quantifying right ventricular function in patients with a systemic right ventricle (RV) is difficult but important for prognosis. Tissue motion annular displacement tracks displacement of the tricuspid annulus toward the apex. We evaluated this measure alongside fractional area change (FAC) on patients with single, RV prior to the bidirectional Glenn procedure. We tested both measures for correlation with outcomes. METHODS: Retrospective measurement of tissue motion annular displacement and FAC was performed on echocardiographic clips obtained prior to the bidirectional Glenn...
March 2018: World Journal for Pediatric & Congenital Heart Surgery
Mardjono Tjahjadi, Joseph Serrone, Juha Hernesniemi
Background: Basilar apex aneurysms constitute 5-8% of all intracranial aneurysms, and their treatment remains challenging for both microsurgical and endovascular approaches. The perceived drawback of the microsurgical approach is its invasiveness leading to increased surgical morbidity. However, many high-volume centers have shown excellent clinical results with better occlusion rates compared to endovascular treatment. With endovascular therapy taking a larger role in the management of cerebral aneurysms, the future role of microsurgery for basilar apex aneurysm treatment is unclear...
2018: Surgical Neurology International
Nathan Zuzow, Arit Ghosh, Marilyn Leonard, Jeffrey Liao, Bing Yang, Eric J Bennett
Previous genetic and biochemical studies from S. cerevisiae have identified a critical ribosome-associated quality control complex (RQC) that facilitates resolution of stalled ribosomal complexes. While components of the mammalian RQC have been examined in vitro , a systematic characterization of RQC protein interactions in mammalian cells has yet to be described. Here, we utilize both proximity-labeling proteomic approaches, BioID and APEX, and traditional affinity-based strategies to both identify interacting proteins of mammalian RQC members and putative substrates for the RQC resident E3 ligase, Ltn1...
March 14, 2018: Molecular Biology of the Cell
Ming Gao, Weihua Zhang, Waiou Zhao, Ling Qin, Fei Pei, Yang Zheng
RATIONALE: Hypereosinophilic syndrome (HES) is a rare disease characterized by hypereosinophilia and its ensuing organ damage. Cardiac involvement is divided into 3 chronological stages: an acute necrotic stage; a thrombus formation stage; and a fibrotic stage. Infiltration of the myocardium by eosinophilic cells followed by endomyocardial fibrosis is known as "Loeffler endocarditis." PATIENT CONCERNS: We report a case of a 60-year-old man diagnosed with left-sided restrictive cardiomyopathy...
March 2018: Medicine (Baltimore)
David Reichstein, Kayla Karan
PURPOSE OF REVIEW: Plaque brachytherapy remains the dominant globe-sparing therapy of uveal melanoma. This report highlights recent advances, which have expanded plaque brachytherapy's uses as well as improved the surgical technique. RECENT FINDINGS: Plaque brachytherapy is effective for tumors that may previously have demanded enucleation. Plaque brachytherapy can be used to control large melanomas as well as melanomas touching the optic nerve. Improvements in planning and design have made plaque therapy simpler for the surgical operator and may reduce collateral radiation damage to normal ocular structures...
March 13, 2018: Current Opinion in Ophthalmology
Dominique J Griffon, Ayman A Mostafa, Laurent Blond, David J Schaeffer
OBJECTIVE: To characterize radioulnar incongruence (RUI) in large dogs with medial coronoid disease (MCD) and determine the agreement between radiography, computed tomography (CT), and arthroscopy. STUDY DESIGN: Prospective observational case series. ANIMALS: Twenty-four large-breed dogs under 3 years of age with confirmed MCD. METHODS: MCD and incongruence were evaluated by radiographs and CT. RUI was measured along the ulnar commissure, mid-body, and apex of the medial coronoid process (MCP) by CT and arthroscopy...
March 13, 2018: Veterinary Surgery: VS
Philipp Kauffmann, Anna Rau, Wilfried Engelke, Markus Troeltzsch, Phillip Brockmeyer, Lauer-Saridakis Dagmar, Robert Cordesmeyer
PURPOSE: Preoperative planning of the implant position as part of a coordinated prosthetic and surgical concept is becoming increasingly important regarding function and esthetics. The aim of this study was to investigate the transmission accuracy of template fixation during surgery in edentulous arches with hand fixation in comparison to intermediary screw fixation. MATERIALS AND METHODS: Preoperatively, 10 implant positions were planned using computed tomography (CT) with the system med3D for implant placement in four mandible models of the Goettingen study model, using a prosthetic diagnostic template...
March 2018: International Journal of Oral & Maxillofacial Implants
Siyuan Dai, Mykhailo Tymchenko, Yafang Yang, Qiong Ma, Marta Pita-Vidal, Kenji Watanabe, Takashi Taniguchi, Pablo Jarillo-Herrero, Michael M Fogler, Andrea Alù, Dimitri N Basov
Hexagonal boron nitride (hBN) is a natural hyperbolic material that supports both volume-confined hyperbolic polaritons and sidewall-confined hyperbolic surface polaritons (HSPs). In this work, efficient excitation, control, and steering of HSPs are demonstrated in hBN through engineering the geometry and orientation of hBN sidewalls. By combining infrared nanoimaging and numerical simulations, the reflection, transmission, and scattering of HSPs are investigated at the hBN corners with various apex angles...
March 13, 2018: Advanced Materials
Bradley Wills, Sung Ro Lee, Parke William Hudson, Bahman SahraNavard, Cesar de Cesar Netto, Sameer Naranje, Ashish Shah
BACKGROUND: Calcaneal osteotomy is a commonly used surgical option for the correction of hindfoot malalignment. A previous cadaveric study described a neurological "safe zone" for calcaneal osteotomy. We performed a retrospective chart review to evaluate the presence of neurological injuries following calcaneal osteotomies and the location of the osteotomy in relation to the reported safe zone. METHODS: In this retrospective study, we reviewed charts of patients who underwent calcaneal osteotomy at our institution from 2011 to 2015...
March 1, 2018: Foot & Ankle Specialist
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