Read by QxMD icon Read


Mina Taati, Esmaeal Tamaddonfard
BACKGROUND: Oxytocin plays an important role in supraspinal modulation of pain. In the present study, we investigated the effects of ventrolateral orbital cortex (VLOC) microinjection of oxytocin on neuropathic pain after blockade of opioid receptors in this area and ventrolateral periaqueductal gray (vlPAG). METHODS: Neuropathic pain was induced by complete transcection of preoneal and tibial branches of sciatic nerve. The VLOC and vlPAG were unilaterally (contralateral to the sciatic nerve-injured side) and bilaterally implanted with guide cannulas, respectively...
December 21, 2017: Pharmacological Reports: PR
Licci Maria, Zweifel Christian, Hench Jürgen, Guzman Raphael, Soleman Jehuda
BACKGROUND: Paranasal sinus osteoma is a common, asymptomatic, histologically benign, and slow-growing tumor. However, it can give rise to secondary pathologies such as a mucocele in about 50% of the cases. Rarely, intracranial and orbital extension is present leading to rhinoliquorrhea, pneumocephalus, or neurological and visual impairment, which might be potentially life-threatening. CASE DESCRIPTION: A 49-year old man presented with an acute frontal lobe syndrome and rhinoliquorrhea...
April 18, 2018: World Neurosurgery
Joel C Davies, Harley H L Chan, Jonathan M Bernstein, David P Goldstein, Jonathan C Irish, Ralph W Gilbert
PURPOSE: Current nonvascular osseous reconstructive options for reconstruction of the orbital floor after maxillectomy include options such as scapular tip and iliac crest bone grafts. The aim of this study was to determine whether these donor sites were morphologically comparable with the orbital floor. MATERIALS AND METHODS: A retrospective cross-sectional study design was selected. By use of a pre-existing melanoma database (January 1, 2005, through September 20, 2015), computed tomography scans of the head, neck, thorax, and pelvis were obtained from patients without evidence of bony metastases...
March 28, 2018: Journal of Oral and Maxillofacial Surgery
Ann E Holbourn, Wolfgang Kuhnt, Steven C Clemens, Karlos G D Kochhann, Janika Jöhnck, Julia Lübbers, Nils Andersen
The late Miocene offers the opportunity to assess the sensitivity of the Earth's climate to orbital forcing and to changing boundary conditions, such as ice volume and greenhouse gas concentrations, on a warmer-than-modern Earth. Here we investigate the relationships between low- and high-latitude climate variability in an extended succession from the subtropical northwestern Pacific Ocean. Our high-resolution benthic isotope record in combination with paired mixed layer isotope and Mg/Ca-derived temperature data reveal that a long-term cooling trend was synchronous with intensification of the Asian winter monsoon and strengthening of the biological pump from ~7 Ma until ~5...
April 20, 2018: Nature Communications
Emily C O'Brien, DaJuanicia N Holmes, Laine E Thomas, Gregg C Fonarow, Larry A Allen, Bernard J Gersh, Peter R Kowey, Daniel E Singer, Michael D Ezekowitz, Gerald V Naccarelli, Jack E Ansell, Paul S Chan, Kenneth W Mahaffey, Alan S Go, James V Freeman, James A Reiffel, Eric D Peterson, Jonathan P Piccini, Elaine M Hylek
Background -Bleeding is commonly cited as a reason for stopping oral anticoagulants (OAC). Whether minor bleeding events ("nuisance bleeding", NB) in patients with atrial fibrillation (AF) on OAC are associated with OAC discontinuation, major bleeding and stroke/systemic embolism (SSE), is unknown. Methods -Within the ORBIT-AF prospective, outpatient registry, we identified 6771 patients ≥18 years of age at 172 sites with AF and eligible followup visits. NB was ascertained from the medical record and was defined as minor bleeding that did not require medical attention (e...
April 20, 2018: Circulation
Geon Hyeong Lee, Young Sik Kim
A novel quinoxaline-based organic dye with heteroleptic dual electron donors (phenoxazine and carbazole) on each side of a quinoxaline was designed, and its electronic and optical properties were investigated theoretically for applications to dye-sensitized solar cells (DSSCs). To understand the factors influencing the photovoltaic efficiency, density functional theory (DFT) and time-dependent density functional theory (TDDFT) calculations of these dyes were performed. The absorption spectrum of the dyes showed different forms because of the different energy levels of the molecular orbital (MO) of each dye and the intramolecular charge-transfer (ICT) characteristics...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Geon Hyeong Lee, Young Sik Kim
In this study, phenoxazine (PXZ)-based dye sensitizers with triphenylamine (TPA) as a dual-electron donor and thiophen and benzothiadiazole (BTD) or 4,7-diethynylbenzo[c][1,2,5]thiadiazole (DEBT) as an electron acceptor (dye1, dye2, and dye3) were designed and investigated. dye3 can significantly stabilize the lowest unoccupied molecular orbital (LUMO) energy level of an organic dye. We used density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations to better understand the factors responsible for the photovoltaic performance...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Geon Hyeong Lee, Young Sik Kim
Novel thermally activated delayed fluorescence (TADF) materials including 10H-phenoxaborin (PXB) as an electron acceptor and carbazole derivatives [carbazole (Cz), 1-methyl-carbazole (1-m-Cz), and 3,6-bis(3,6-diphenylcarbazolyl)carbazole (BDPCC)] as electron donors (Cz-PXB, 1-m-Cz-PXB, and BDPCC-PXB) were designed and investigated theoretically for deep blue organic light-emitting diode (OLED). Using density functional theory (DFT) and time-dependent DFT calculations, we obtained the electron distribution of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) and the energy of the lowest singlet (S1) and the lowest triplet (T1) excited states...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Sang-Geon Park, Tatsuo Mori
In this study, we investigated the photoelectric effect and optimization of an organic light-emitting diode (OLED) depending on the presence or absence of a fluorinated self-assembled monolayer (FLSAM) and by varying the thickness of N,N'-Di (1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (α-NPD) from 0 nm to 50 nm. The large distinction in electronegativity between the carbon and the fluorine replacing hydrogen in the alkyl chain of FLSAM generates a strong dipole moment to elevate the vacuum level, resulting in a change of the work function...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Jeonghyun Lee, Pyungho Choi, Minsoo Kim, Kiwon Lim, Younghwan Hyeon, Soonkon Kim, Kwangjun Koo, Sangsoo Kim, Byoungdeog Choi
In this paper, we investigated the use of a mixed host emission layer (MH-EML) in green phosphorescent organic light-emitting diodes (OLEDs). The hole transport type (p-type) material (4,4'-Bis(N-carbazolyl)-1,1'-biphenyl (CBP)) and electron transport type (N-type) material (2,2',2″-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi)) were mixed with different ratios. The electrons were easily injected through the lowest unoccupied molecular orbital (LUMO) of TPBi in the mixed host system. Also, holes were confined in the EML because of the deep highest occupied molecular orbital (HOMO) level of TPBi (6...
September 1, 2018: Journal of Nanoscience and Nanotechnology
María Blanco-Rey, Ane Sarasola, Corneliu Nistor, Luca Persichetti, Christian Stamm, Cinthia Piamonteze, Pietro Gambardella, Sebastian Stepanow, Mikhail M Otrokov, Vitaly N Golovach, Andres Arnau
The magnetic anisotropy and exchange coupling between spins localized at the positions of 3d transition metal atoms forming two-dimensional metal⁻organic coordination networks (MOCNs) grown on a Au(111) metal surface are studied. In particular, we consider MOCNs made of Ni or Mn metal centers linked by 7,7,8,8-tetracyanoquinodimethane (TCNQ) organic ligands, which form rectangular networks with 1:1 stoichiometry. Based on the analysis of X-ray magnetic circular dichroism (XMCD) data taken at T = 2.5 K, we find that Ni atoms in the Ni⁻TCNQ MOCNs are coupled ferromagnetically and do not show any significant magnetic anisotropy, while Mn atoms in the Mn⁻TCNQ MOCNs are coupled antiferromagnetically and do show a weak magnetic anisotropy with in-plane magnetization...
April 20, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Jan Vícha, Stanislav Komorovsky, Michal Repisky, Radek Marek, Michal Straka
The importance of relativistic effects on the NMR parameters in heavy-atom (HA) compounds, particularly the SO-HALA (Spin-Orbit Heavy Atom on the Light Atom) effect on NMR chemical shifts, has been known for about 40 years. Yet, a general correlation between the electronic-structure and SO-HALA effect have been missing. By analyzing 1H NMR chemical shifts of the 6th-period hydrides (Cs-At) we discovered general electronic-structure principles and mechanisms that dictate the size and sign of the SO-HALA NMR chemical shifts...
April 20, 2018: Journal of Chemical Theory and Computation
Nian-Tzu Suen, Sheng-Ping Guo, James Hoos, Svilen Bobev
Reported are the syntheses, crystal structures, and electronic structures of six rare-earth metal-lithium stannides with the general formulas RE3 Li4- x Sn4+ x (RE = La-Nd, Sm) and Eu7 Li8- x Sn10+ x . These new ternary compounds have been synthesized by high-temperature reactions of the corresponding elements. Their crystal structures have been established using single-crystal X-ray diffraction methods. The RE3 Li4- x Sn4+ x phases crystallize in the orthorhombic body-centered space group Immm (No. 71) with the Zr3 Cu4 Si4 structure type (Pearson code oI22), and the Eu7 Li8- x Sn10+ x phase crystallizes in the orthorhombic base-centered space group Cmmm (No...
April 20, 2018: Inorganic Chemistry
Nizhuan Wang, Huijun Wu, Min Xu, Yang Yang, Chunqi Chang, Weiming Zeng, Hongjie Yan
Recently, functional magnetic resonance imaging (fMRI) has been increasingly used to assess brain function. Brain entropy is an effective model for evaluating the alteration of brain complexity. Specifically, the sample entropy (SampEn) provides a feasible solution for revealing the brain's complexity. Occupation is one key factor affecting the brain's activity, but the neuropsychological mechanisms are still unclear. Thus, in this article, based on fMRI and a brain entropy model, we explored the functional complexity changes engendered by occupation factors, taking the seafarer as an example...
April 20, 2018: Human Brain Mapping
F N N Pansini, F A L de Souza, C T Campos
A detailed analysis of the electronic structure of the ground and first excited spin state of three diatomic molecules ( N2, BH and CO) under static applied electric field is performed at CCSD(T), DFT, MRCI and MRCI(Q) levels of theory. Our findings have revealed that by boosting the applied field one induces changes in the occupation numbers of molecular orbitals, giving rise to changes in the equilibrium geometry and in the HOMO-LUMO energy gap. Specifically, singlet to triplet spin transition can be induced by increasing the applied electric field beyond a critical value...
April 20, 2018: Journal of Computational Chemistry
Jitendra Pal Singh, Baljeet Kaur, Aditya Sharma, So Hee Kim, Sanjeev Gautam, Ramesh Chandra Srivastava, Navdeep Goyal, Weol Cheol Lim, H-J Lin, J M Chen, K Asokan, D Kanjilal, Sung Ok Won, Ik-Jae Lee, Keun Hwa Chae
The interactions of energetic ions with multi-cation compounds and their consequences in terms of changes in the local electronic structure, which may facilitate intriguing hybridization between O 2p and metal d orbitals and magnetic ordering, are the subject of debate and require a deep understanding of energy transfer processes and magnetic exchange mechanisms. In this study, nanocrystals of ZnFe2O4 were exposed to O7+ ions with an energy of 100 MeV to understand, qualitatively and quantitatively, the metal-ligand field interactions, cation migration and magnetic exchange interactions by employing X-ray absorption fine structure measurements and X-ray magnetic circular dichroism to get deeper mechanistic insights...
April 20, 2018: Physical Chemistry Chemical Physics: PCCP
Xiangru Kong, Linyang Li, Ortwin Leenaerts, Weiyang Wang, Xiong-Jun Liu, François M Peeters
The quantum anomalous Hall (QAH) effect is a topologically nontrivial phase, characterized by a non-zero Chern number defined in the bulk and chiral edge states in the boundary. Using first-principles calculations, we demonstrate the presence of the QAH effect in a 1T-YN2 monolayer, which was recently predicted to be a Dirac half metal without spin-orbit coupling (SOC). We show that the inclusion of SOC opens up a large nontrivial bandgap of nearly 0.1 eV in the electronic band structure. This results in the nontrivial bulk topology, which is confirmed by the calculation of Berry curvature, anomalous Hall conductance and the presence of chiral edge states...
April 20, 2018: Nanoscale
Brandon Lucke-Wold, Gustavo Mendez, David Cua, Paul Akins, Haley Gillham, Jeremy Ciporen
Background and importance: High flow orbital apex or middle fossa cerebrospinal fluid (CSF) leaks can be life threatening and complex to repair. These leaks associated with large dural defects are most commonly repaired with an open temporalis muscle patch or free flaps, but these flaps do not always stop the leak. Clinical Presentation: A 65-year-old patient presented two years after orbital exenteration and radiation for squamous cell carcinoma. He developed multi-organism meningitis and pneumocephalus secondary to a large high-flow orbital apex/middle fossa CSF leak...
2018: J Neuroinflamm Neurodegener Dis
Ziya Akingol, Safak Karslioglu, Didem Serin
Cervicofacial emphysema (CFE), mostly seen after trauma or dental procedures, is an unexpected, extremely rare condition after uncomplicated dacryocystorhinostomy (DCR). It may be misdiagnosed as angioedema or necrotizing fasciitis. In this article, we present the case of a 40-year-old female with CFE twice after uncomplicated unilateral DCR for left and right sides on different operative days. CFE was confirmed by computed tomography, demonstrating extensive air within subcutaneous tissues of the face, neck, and orbital cavity...
May 2018: Indian Journal of Ophthalmology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"