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https://www.readbyqxmd.com/read/28944973/a-full-pivoting-algorithm-for-the-cholesky-decomposition-of-two-electron-repulsion-and-spin-orbit-coupling-integrals
#1
Matteo Piccardo, Alessandro Soncini
A significant reduction in the computational effort for the evaluation of the electronic repulsion integrals (ERI) in ab initio quantum chemistry calculations is obtained by using Cholesky decomposition (CD), a numerical procedure that can remove the zero or small eigenvalues of the ERI positive (semi)definite matrix, while avoiding the calculation of the entire matrix. Conversely, due to its antisymmetric character, CD cannot be directly applied to the matrix representation of the spatial part of the two-electron spin-orbit coupling (2e-SOC) integrals...
September 25, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28941505/advances-in-the-reconstruction-of-orbital-fractures
#2
REVIEW
Scott E Bevans, Kris S Moe
Orbital reconstruction is one of the most challenging tasks for surgeons who treat craniofacial trauma. Suboptimal outcomes carry a high level of morbidity, with functional, emotional, and aesthetic implications. However, advances in reconstruction techniques, including the use of orbital endoscopy, computer-guided navigation, and mirror image overlay techniques, have been shown to provide significant improvements in outcomes. This article provides practical advice for applying these techniques to orbital reconstruction following trauma...
November 2017: Facial Plastic Surgery Clinics of North America
https://www.readbyqxmd.com/read/28940141/iq%C3%A2-spect-technology-and-its-clinical-applications-using-multicenter-normal-databases
#3
Kenichi Nakajima, Koichi Okuda, Mitsuru Momose, Shinro Matsuo, Chisato Kondo, Masayoshi Sarai, Takayuki Shibutani, Masahisa Onoguchi, Takeshi Shimizu, A Hans Vija
IQ·SPECT (Siemens Medical Solutions) is a solution for high-sensitivity and short-time acquisition imaging of the heart for a variable angle general purpose gamma camera. It consists of a multi-focal collimator, a cardio-centric orbit and advanced iterative reconstruction, modeling the image formation physics accurately. The multi-focal collimator enables distance-dependent enlargement of the center region while avoiding truncation at the edges. With the specified configuration and a cardio-centric orbit it can obtain a fourfold sensitivity increase for the heart at the center of the scan orbit...
September 22, 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28936780/ct-based-spect-attenuation-correction-and-assessment-of-infarct-size-results-from-a-cardiac-phantom-study
#4
Alexander Stephan Kroiss, Stephan Gerhard Nekolla, Georg Dobrozemsky, Thomas Grubinger, Barry Lynn Shulkin, Markus Schwaiger
RATIONALE: Myocardial perfusion SPECT is a commonly performed, well established, clinically useful procedure for the management of patients with coronary artery disease. However, the attenuation of photons from myocardium impacts the quantification of infarct sizes. CT-Attenuation Correction (AC) potentially resolves this problem. This contention was investigated by analyzing various parameters for infarct size delineation in a cardiac phantom model. METHODS: A thorax phantom with a left ventricle (LV), fillable defects, lungs, spine and liver was used...
September 21, 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28930925/conical-modification-of-forearm-free-flaps-for-single-stage-reconstruction-after-total-orbital-exenteration
#5
Chad A Purnell, Elbert E Vaca, Marco F Ellis
BACKGROUND: Orbital exenteration is a significant reconstructive challenge for plastic surgeons. Options described for these defects range from healing by secondary intention to free tissue transfer. The authors present our preferred reconstruction of orbital defects with free forearm-based flaps, which provides quality soft tissue and orbital contouring in 1 stage to consistently allow placement of bone-anchored implants for eventual orbital prosthesis. METHODS: This conical shape of the orbit is deconstructed into a "Pac-Man" type shaped flap that leaves adequate depth for a prosthesis...
September 19, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28928374/rethinking-the-origin-of-primates-by-reconstructing-their-diel-activity-patterns-using-genetics-and-morphology
#6
Yonghua Wu, Haifeng Wang, Haitao Wang, Elizabeth A Hadly
Phylogenetic inference typically invokes nocturnality as ancestral in primates; however, some recent studies posit that diurnality is. Here, through adaptive evolutionary analyses of phototransduction genes by using a variety of approaches (restricted branch/branch-site models and unrestricted branch-site-based models (BS-REL, BUSTED and RELAX)), our results consistently showed that ancestral primates were subjected to enhanced positive selection for bright-light vision and relatively weak selection for dim-light vision...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28922242/long-term-follow-up-of-osseointegrated-orbital-prosthetic-reconstruction
#7
Joshua J DeSerres, Curtis R Budden, Johan F Wolfaardt, Gordon H Wilkes
BACKGROUND: Osseointegrated implants have been used for craniofacial prosthetic reconstruction since 1979. The authors sought to review long-term outcomes of osseointegrated orbital reconstruction at the Institute for Reconstructive Sciences in Medicine (iRSM). METHODS: Twenty-six patients have undergone osseointegrated orbital prosthetic (OOP) reconstruction at iRSM since 1991. A retrospective chart review was performed and patient satisfaction assessed through a questionnaire used in previous osseointegration studies...
September 15, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28922241/a-shift-in-the-orbit-immediate-endoscopic-reconstruction-after-transnasal-orbital-tumors-resection
#8
Giacomo Colletti, Alberto M Saibene, Federico Pessina, Marco Duvina, Fabiana Allevi, Giovanni Felisati, Federico Biglioli
Endoscopic endonasal resection of orbital lesions is a safe and common approach. Nevertheless, medial orbital wall defects following the procedure are not routinely addressed, potentially leading to diplopia and enophthalmos. In this article, the authors propose a new technique for purely endoscopic endonasal reconstruction of orbital wall defects following endoscopic endonasal resection of orbital lesions.The patient, a 43-year-old male, suffering from right exophthalmos and diplopia due to a venous malformation of the right orbit underwent endoscopic endonasal resection of the mass...
September 15, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28918531/penetrating-orbital-trauma-leading-to-trans-orbital-brain-herniation
#9
Siddharth Vankipuram, Chittij Srivastava, B K Ojha, Sushant Sahoo
INTRODUCTION: Development of a posttraumatic herniation of brain parenchyma through the orbit is a rare complication of orbital roof fracture. Mostly, the injury is due to a direct impact to the frontal region resulting in orbital roof fracture with dural defect and herniation of cerebrospinal fluid or brain parenchyma. These patients present with acute or gradually progressive proptosis with impending risk of loss of vision and mandate surgical decompression of optic nerve with watertight closure of the dural defect...
September 16, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28916325/what-is-the-incidence-of-implant-malpositioning-and-revision-surgery-after-orbital-repair
#10
Fabian Schlittler, Andre Schmidli, Franca Wagner, Chantal Michel, Matthias Mottini, Olivier Lieger
PURPOSE: Postoperative radiographic examinations are the gold standard in maxillofacial surgery, except in orbital reconstruction. Therefore, the purpose of this study was to estimate the frequency of implant malposition and revision operation after orbital repair. MATERIALS AND METHODS: This retrospective cohort study was conducted in a level I trauma center at the University Hospital in Bern, Switzerland. To assess the incidence of malpositioning, a qualitative analysis of postoperative computed tomography scans, as well as comparative volumetric measurements of the orbits, was conducted...
August 23, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28913322/late-complication-of-a-silicone-implant-thirty-years-after-orbital-fracture-reconstruction
#11
Chi An Lee, Seok Joo Kang, Ji Young Yun, Hook Sun
Alloplastic materials used for orbital fracture reconstruction can induce complications, such as infection, migration, extrusion, intraorbital hemorrhage, and residual diplopia. Silicone is one of the alloplastic materials that has been widely used for decades. The author reports a rare case of spontaneous extrusion of a silicone implant that was used for orbital fracture reconstruction 30 years earlier. A 50-year-old man was admitted to the emergency room for an exposed substance in the lower eyelid area of the left eye, which began as a palpable hard nodule a week earlier...
June 2017: Arch Craniofac Surg
https://www.readbyqxmd.com/read/28904337/toxoplasma-modulates-signature-pathways-of-human-epilepsy-neurodegeneration-cancer
#12
Huân M Ngô, Ying Zhou, Hernan Lorenzi, Kai Wang, Taek-Kyun Kim, Yong Zhou, Kamal El Bissati, Ernest Mui, Laura Fraczek, Seesandra V Rajagopala, Craig W Roberts, Fiona L Henriquez, Alexandre Montpetit, Jenefer M Blackwell, Sarra E Jamieson, Kelsey Wheeler, Ian J Begeman, Carlos Naranjo-Galvis, Ney Alliey-Rodriguez, Roderick G Davis, Liliana Soroceanu, Charles Cobbs, Dennis A Steindler, Kenneth Boyer, A Gwendolyn Noble, Charles N Swisher, Peter T Heydemann, Peter Rabiah, Shawn Withers, Patricia Soteropoulos, Leroy Hood, Rima McLeod
One third of humans are infected lifelong with the brain-dwelling, protozoan parasite, Toxoplasma gondii. Approximately fifteen million of these have congenital toxoplasmosis. Although neurobehavioral disease is associated with seropositivity, causality is unproven. To better understand what this parasite does to human brains, we performed a comprehensive systems analysis of the infected brain: We identified susceptibility genes for congenital toxoplasmosis in our cohort of infected humans and found these genes are expressed in human brain...
September 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28886046/effects-of-water-avoidance-stress-on-peripheral-and-central-responses-during-bladder-filling-in-the-rat-a-multidisciplinary-approach-to-the-study-of-urologic-chronic-pelvic-pain-syndrome-mapp-research-network-study
#13
Zhuo Wang, Harriet H Chang, Yunliang Gao, Rong Zhang, Yumei Guo, Daniel P Holschneider, Larissa V Rodriguez
Stress plays a role in the exacerbation and possibly the development of functional lower urinary tract disorders. Chronic water avoidance stress (WAS) in rodents is a model with high construct and face validity to bladder hypersensitive syndromes, such as interstitial cystitis/bladder pain syndrome (IC/BPS), characterized by urinary frequency and bladder hyperalgesia and heightened stress responsiveness. Given the overlap of the brain circuits involved in stress, anxiety, and micturition, we evaluated the effects chronic stress has on bladder function, as well as its effects on regional brain activation during bladder filling...
2017: PloS One
https://www.readbyqxmd.com/read/28885440/is-orbital-floor-reconstruction-with-titanium-mesh-safe
#14
Omar Bakr Hazm Al-Khdhairi, Saif Saadedeen Abdulrazaq
To reconstruct the orbital floor defects there are a lot of reconstruction materials, the surgeon must choose one of them. The authors share their experience with 10 patients suffering from orbital trauma causing orbital floor fracture; those fractures were reconstructed using titanium mesh. No complications were encountered postoperatively apart from 1 patient with ectropion. Titanium mesh is a perfect material for the reconstruction of the orbital fractures, eliminating the need for autogenous bone graft.
September 6, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28872513/reconstruction-of-orbital-floor-with-auricular-concha
#15
Ergin Seven, Ali Teoman Tellioglu, Emre Inozu, Hulda Rifat Ozakpinar, Ugur Horoz, Avni Tolga Eryilmaz, Sebat Karamursel
Orbital floor fractures of varying sizes commonly occur after orbital injuries and remain a serious challenge. Serious complications of such fractures include enopthalmos, restriction of extraocular movement, and diplopia. There is a dearth of literature that can be applied widely, easily, and successfully in all such situations, and therefore there is no consensus on the treatment protocol of this pathology yet. Autogenous grafts and alloplastic and allogenic materials with a wide variety of advantages and disadvantages have been discussed...
September 1, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28863230/dorsal-and-ventral-parts-of-thalamic-nucleus-submedius-project-to-different-areas-of-rat-orbitofrontal-cortex-a-single-neuron-tracing-study-using-virus-vectors
#16
Eriko Kuramoto, Haruki Iwai, Atsushi Yamanaka, Sachi Ohno, Haruka Seki, Yasuhiro R Tanaka, Takahiro Furuta, Hiroyuki Hioki, Tetsuya Goto
The rodent orbitofrontal cortex is involved in a variety of cognitive and behavioral functions that require thalamic input to be successfully expressed. Although the thalamic nucleus submedius (Sm) is a major source of afferents to the orbitofrontal cortex, thalamocortical projection from the Sm has not been fully elucidated. In the present study, we first divided the rat Sm into dorsal and ventral parts according to the distribution of vesicular glutamate transporter 2-immunoreactive varicosities, which were somatosensory afferents from the brain stem...
September 1, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28860916/dermis-fat-graft-for-pediatric-exenteration-challenging-but-rewarding
#17
Himika Gupta, Deepa Nair, Aliasgar Moiyadi, Prathamesh Pai
Orbital exenteration is a destructive and disfiguring surgery and involves removal of the entire orbital contents, soft tissue and often lids as well. We report a case of an eight month old female, with malignant orbital teratoma who underwent lid sparing exenteration for the destructive, locally advanced disease. Three month post surgery she developed recurrence with intracranial extension as well as socket infection with pus discharge. Repeat surgery involved a multispeciality approach for removal of the tumor which was abutting the cavernous sinus posteriorly and ethmoid sinus medially, apart from filling the entire bony orbit...
July 2017: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28853707/physics-of-srtio-sub-3-sub-based-heterostructures-and-nanostructures-a-review
#18
Yun-Yi Pai, Anthony Tylan-Tyler, Patrick Irvin, Jeremy Levy
1 Overview 1 1.1 Introduction 1 1.1.1 Oxide growth techniques are rooted in search for high-Tc superconductors 2 1.1.2 First reports of interface conductivity 2 1.2 2D physics 2 1.3 Emergent properties of oxide heterostructures and nanostructures 3 1.4 Outline 3 2 Relevant properties of SrTiO3 3 2.1 Structural properties and transitions 3 2.2 Ferroelectricity, Paraelectricity and Quantum Paraelectricity 4 2.3 Electronic structure 5 2.4 Defects 6 2...
August 30, 2017: Reports on Progress in Physics
https://www.readbyqxmd.com/read/28844593/alveolar-soft-part-sarcoma-of-orbit-a-rare-diagnosis
#19
Pritee B Chaudhari, Sushmita Pathy, Suryanarayana S V Deo, Bhavna Chawla, Asit Ranjan Mridha
OBJECTIVE: Alveolar soft part sarcoma (ASPS) is an aggressive, rare tumour with unique morphological and histopathological features. METHODS: We report a rare case of orbital ASPS and its management in a young male who presented with painless proptosis and progressive loss of vision. RESULT: Twenty-two year male presented with a history of gradually increasing proptosis with loss of vision since 12months. He underwent radical re-excision of mass with right orbital exenteration and reconstruction using temporalis muscle flap...
August 22, 2017: Journal of the Egyptian National Cancer Institute
https://www.readbyqxmd.com/read/28844052/multicentred-international-review-of-orbital-exenteration-and-reconstruction-in-oculoplastic-and-orbit-practice
#20
Ze Zhang, Son Ho, Vivian Yin, Gonzalo Varas, Saul Rajak, Peter J Dolman, Alan McNab, J Godfrey Heathcote, Alejandra Valenzuela
BACKGROUND: Orbital exenteration is a disfiguring procedure reserved for life-threatening malignancies. This study examines the clinical course and outcomes of a large series of patients who underwent orbital exenteration for malignant periocular neoplasms. METHODS: This is a retrospective review of patients who underwent orbital exenteration from 1 July 2005 to 30 June 2015 at four tertiary referral centres in the USA, Australia and Canada. Demographics, indication for surgery, pathology, surgical technique, reconstruction type and outcomes were reviewed...
August 26, 2017: British Journal of Ophthalmology
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