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https://www.readbyqxmd.com/read/28440903/triple-doped-monolayer-graphene-with-boron-nitrogen-aluminum-silicon-phosphorus-and-sulfur
#1
Pablo Andres Denis, Saif Ullah, Fernando Sato
We have investigated the structure, stability, electronic properties and chemical reactivity of X/B/N triple doped graphene systems, X= Al, Si, P and S, by means of density functional periodic calculations. For the triple doped graphene (TDG) systems studied the dopants prefer to be bonded instead of separated. In general, the XNB pattern is preferred, with the exception of sulfur which favors the SBN motif. The introduction of a third dopant results in a negligible decrease of the cohesive energies with respect to their dual doped graphene (DDG) counterparts...
April 25, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28440032/discrepancies-between-the-one-stage-clotting-assay-and-the-chromogenic-assay-in-haemophilia-b
#2
K Kihlberg, K Strandberg, S Rosén, R Ljung, J Astermark
INTRODUCTION: Assay discrepancy in factor VIII activity between the one-stage and the chromogenic assays has been described in approximately one third of patients with non-severe haemophilia A. Whether assay discrepancy may also occur in patients with haemophilia B remains unknown. AIM: This study compared the results from the one-stage and the chromogenic assays in patients with haemophilia B. METHODS: Plasma samples from patients with haemophilia B attending the haemophilia centre in Malmö, Sweden, were collected after a wash-out period of more than 7 days and analysed with both assays...
April 24, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28438443/cone-beam-computed-tomography-assessment-of-the-pterygomaxillary-region-and-palatine-canal-for-le-fort-i-osteotomy
#3
G Q V Oliveira, M A Rossi, T V Vasconcelos, F S Neves, I Crusoé-Rebello
The aim of this study was to evaluate the anatomical linear measurements of the descending palatine canal and the pterygomaxillary fissure for Le Fort I preoperative planning. Seventy-five patients, comprising 46 females (61.3%) and 29 males (39.7%), underwent multi-slice computed tomography examinations performed for preoperative orthognathic surgical planning. The images were categorized according to sex, craniofacial side, and skeletal and craniofacial patterns. The anterior length between the descending palatine canal and the lateral wall of the piriform rim showed a higher mean value for males compared to females (P=0...
April 21, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28437785/the-retina-of-asian-and-african-elephants-comparison-of-newborn-and-adult
#4
Heidrun Kuhrt, Andreas Bringmann, Wolfgang Härtig, Gudrun Wibbelt, Leo Peichl, Andreas Reichenbach
Elephants are precocial mammals that are relatively mature as newborns and mobile shortly after birth. To determine whether the retina of newborn elephants is capable of supporting the mobility of elephant calves, we compared the retinal structures of 2 newborn elephants (1 African and 1 Asian) and 2 adult animals of both species by immunohistochemical and morphometric methods. For the first time, we present here a comprehensive qualitative and quantitative characterization of the cellular composition of the newborn and the adult retinas of 2 elephant species...
April 25, 2017: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28435139/the-role-of-lactic-acid-production-by-probiotic-lactobacillus-species-in-vaginal-health
#5
Gilda Tachedjian, Muriel Aldunate, Catronia S Bradshaw, Richard A Cone
Vaginal eubiosis is characterised by beneficial lactobacillus-dominated microbiota. In contrast, vaginal dysbiosis (e.g. bacterial vaginosis, BV), characterised by an overgrowth of multiple anaerobes, is associated with an increased risk of adverse urogenital and reproductive health outcomes. A major distinguishing feature between the vaginal environment in states of eubiosis and dysbiosis is a high concentration of lactic acid, produced by lactobacilli, that acidifies the vagina in eubiosis versus a sharp drop in lactic acid and an increase in pH in dysbiosis...
April 20, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28431662/lekperic-s-livshits-i-tabori-n-patel-r-lookstein-r-kim-e-fischman-a-nowakowski-f-patient-radiation-exposure-in-hepatic-chemoembolization-utilizing-cone-beam-ct-comparison-of-transradial-and-transfemoral-approaches-j-vasc-interv-radiol-2017-28-s128-s129
#6
https://www.readbyqxmd.com/read/28428805/edible-dormice-glis-glis-avoid-areas-with-a-high-density-of-their-preferred-food-plant-the-european-beech
#7
Jessica S Cornils, Franz Hoelzl, Birgit Rotter, Claudia Bieber, Thomas Ruf
BACKGROUND: Numerous species, especially among rodents, are strongly affected by the availability of pulsed resources. The intermittent production of large seed crops in northern hemisphere tree species (e.g., beech Fagus spec.,oak Quercus spec., pine trees Pinus spec.) are prime examples of these resource pulses. Adult edible dormice are highly dependent on high energy seeds to maximize their reproductive output. For juvenile dormice the energy rich food is important to grow and fatten in a very short time period prior to hibernation...
2017: Frontiers in Zoology
https://www.readbyqxmd.com/read/28428265/inhibition-of-thyroid-hormone-receptor-locally-in-the-retina-is-a-therapeutic-strategy-for-retinal-degeneration
#8
Hongwei Ma, Fan Yang, Michael R Butler, Joshua Belcher, T Michael Redmond, Andrew T Placzek, Thomas S Scanlan, Xi-Qin Ding
Thyroid hormone (TH) signaling regulates cell proliferation, differentiation, and metabolism. Recent studies have implicated TH signaling in cone photoreceptor viability. Using mouse models of retinal degeneration, we demonstrated that antithyroid drug treatment and targeting iodothyronine deiodinases (DIOs) to suppress cellular tri-iodothyronine (T3) production or increase T3 degradation preserves cones. In this work, we investigated the effectiveness of inhibition of the TH receptor (TR). Two genes, THRA and THRB, encode TRs; THRB2 has been associated with cone viability...
April 20, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28421970/management-of-fractured-inferior-vena-cava-filters-outcomes-by-fragment-location
#9
Scott O Trerotola, S William Stavropoulos
Purpose To inform the management of fractured inferior vena cava filters on the basis of results from a tertiary referral center specializing in complex filter retrieval. Materials and Methods This study had institutional review board approval and was HIPAA compliant. Retrospective analysis of all patients with fractured filters and/or filter fragments evaluated for removal in a complex filter removal program was performed. Removal was attempted when fragments were intravascular or immediately extravascular by using primarily endobronchial forceps for caval fragments and snares for cardiac and pulmonary fragments...
April 19, 2017: Radiology
https://www.readbyqxmd.com/read/28414927/integration-of-free-hand-3d-ultrasound-and-mobile-c-arm-cone-beam-ct-feasibility-and-characterization-for-real-time-guidance-of-needle-insertion
#10
E Marinetto, A Uneri, T De Silva, S Reaungamornrat, W Zbijewski, A Sisniega, S Vogt, G Kleinszig, J Pascau, J H Siewerdsen
This work presents development of an integrated ultrasound (US)-cone-beam CT (CBCT) system for image-guided needle interventions, combining a low-cost ultrasound system (Interson VC 7.5MHz, Pleasanton, CA) with a mobile C-arm for fluoroscopy and CBCT via use of a surgical tracker. Imaging performance of the ultrasound system was characterized in terms of depth-dependent contrast-to-noise ratio (CNR) and spatial resolution. US-CBCT system was evaluated in phantom studies simulating three needle-based procedures: drug delivery, tumor ablation, and lumbar puncture...
April 3, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28414870/three-dimensional-skeletal-mandibular-changes-associated-with-herbst-appliance-treatment
#11
B Q Souki, P L C Vilefort, D D Oliveira, I Andrade, A C Ruellas, M S Yatabe, T Nguyen, L Franchi, J A McNamara, L H S Cevidanes
OBJECTIVES: Three-dimensional evaluation of skeletal mandibular changes following Herbst appliance treatment. SETTING AND SAMPLE POPULATION: Retrospective case-control study, based on a sample size calculation. Twenty-five pubertal patients treated with Herbst appliance (HAG), and 25 matched Class II patients who received other non-orthopaedic dental treatments (CG). MATERIAL AND METHODS: Three-dimensional models were generated from pre-treatment (T0) and post-treatment (T1) cone beam computed tomograms...
May 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28414869/zygomaticomaxillary-suture-maturation-a-predictor-of-maxillary-protraction-part-i-a-classification-method
#12
F Angelieri, L Franchi, L H S Cevidanes, C T Hino, T Nguyen, J A McNamara
OBJECTIVE: The aim of this study was to present a method of classifying the maturational level of the zygomaticomaxillary sutures (ZMSs). METHODS: Cone-beam CT (CBCT) images from 74 subjects (5.6-58.4 years) were examined to define the radiographic stages of ZMS maturation. Five stages of maturation of the ZMS were identified and defined: Stage A-uniform high-density sutural line, with no or little interdigitation; Stage B-scalloped appearance of the high-density sutural line; Stage C-two parallel, scalloped, high-density lines, separated in some areas by small low-density spaces; Stage D-fusion in the inferior portion of the suture; and Stage E-complete fusion...
May 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28414048/light-and-the-laboratory-mouse
#13
Stuart N Peirson, Laurence A Brown, Carina A Pothecary, Lindsay A Benson, Angus S Fisk
Light exerts widespread effects on physiology and behaviour. As well as the widely-appreciated role of light in vision, light also plays a critical role in many non-visual responses, including regulating circadian rhythms, sleep, pupil constriction, heart rate, hormone release and learning and memory. In mammals, responses to light are all mediated via retinal photoreceptors, including the classical rods and cones involved in vision as well as the recently identified melanopsin-expressing photoreceptive retinal ganglion cells (pRGCs)...
April 13, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28412232/accuracy-of-video-observation-and-a-three-dimensional-head-tracking-system-for-detecting-and-quantifying-robot-simulated-head-movements-in-cone-beam-computed-tomography
#14
Rubens Spin-Neto, Louise H Matzen, Lars Schropp, Thomas S Sørensen, Erik Gotfredsen, Ann Wenzel
OBJECTIVES: To assess the accuracy of detecting robot-simulated head movements using video observation (VO) and 3-dimensional head tracking (HT) in a cone beam computed tomography examination setup. STUDY DESIGN: A mannequin head was mounted on a robot that was programmed to simulate patient head movements. Six types of movement (tremor, nodding, lateral rotation, lifting, swallowing, and anteroposterior translation), 3 distances (0.25, 1, and 5 mm), and 2 speeds (1 and 5 mm/s) were tested in triplicate (108 examinations)...
February 28, 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28411930/marine-envenomation
#15
REVIEW
Kirsten B Hornbeak, Paul S Auerbach
Venomous aquatic animals are hazardous to swimmers, surfers, divers, and fishermen. Exposures include mild stings, bites, abrasions, and lacerations. Severe envenomations can be life threatening. This article reviews common marine envenomations, exploring causative species, clinical presentation, and current treatment recommendations. Recommendations are included for cnidaria, sponges, bristle worms, crown-of-thorns starfish, sea urchins, venomous fish, stingrays, cone snails, stonefish, blue-ringed octopus, and sea snakes...
May 2017: Emergency Medicine Clinics of North America
https://www.readbyqxmd.com/read/28407514/age-estimation-from-structural-changes-of-teeth-and-buccal-alveolar-bone-level
#16
K K Koh, J S Tan, P Nambiar, Norliza Ibrahim, Sunil Mutalik, Muhammad Khan Asif
Forensic odontology plays a vital role in the identification and age estimation of unknown deceased individuals. The purpose of this study is to estimate the chronological age from Cone-Beam Computed Tomography (CBCT) images by measuring the buccal alveolar bone level (ABL) to the cemento-enamel junction and to investigate the possibility of employing the age-related structural changes of teeth as studied by Gustafson. In addition, this study will determine the forensic reliability of employing CBCT images as a technique for dental age estimation...
April 1, 2017: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/28406135/sliding-malar-bone-augmentation-technique-with-a-high-le-fort-i-surgically-assisted-rapid-maxillary-expansion
#17
G Dergin, P Aktop, S Biren, S Aktop
The purpose of this report is to evaluate the effectiveness of a high Le Fort I osteotomy design, including the malar bones, which allows segment sliding over the zygoma and forces the osteotomized segment to move forward with distraction. Two patients (male, 23-and 30-year-old) with malar deficiency underwent high Le Fort I osteotomy and surgically assisted rapid maxillary expansion procedure was followed. Records were taken before and 6 months after surgery for comparison, including intra and extra oral photographs and three-dimensional cone-beam computed tomography (CBCT) images...
April 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28405102/measurement-of-total-scatter-factor-for-stereotactic-cones-with-plastic-scintillation-detector
#18
Suresh H Chaudhari, Rishabh Dobhal, Rajesh A Kinhikar, Sudarshan S Kadam, Deepak D Deshpande
Advanced radiotherapy modalities such as stereotactic radiosurgery (SRS) and image-guided radiotherapy may employ very small beam apertures for accurate localized high dose to target. Accurate measurement of small radiation fields is a well-known challenge for many dosimeters. The purpose of this study was to measure total scatter factors for stereotactic cones with plastic scintillation detector and its comparison against diode detector and theoretical estimates. Measurements were performed on Novalis Tx(™) linear accelerator for 6MV SRS beam with stereotactic cones of diameter 6 mm, 7...
January 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28403143/a-novel-mechanism-of-cone-photoreceptor-adaptation
#19
Marcus H C Howlett, Robert G Smith, Maarten Kamermans
An animal's ability to survive depends on its sensory systems being able to adapt to a wide range of environmental conditions, by maximizing the information extracted and reducing the noise transmitted. The visual system does this by adapting to luminance and contrast. While luminance adaptation can begin at the retinal photoreceptors, contrast adaptation has been shown to start at later stages in the retina. Photoreceptors adapt to changes in luminance over multiple time scales ranging from tens of milliseconds to minutes, with the adaptive changes arising from processes within the phototransduction cascade...
April 2017: PLoS Biology
https://www.readbyqxmd.com/read/28402329/no-evidence-for-loss-of-short-wavelength-sensitive-cone-photoreceptors-in-normal-ageing-of-the-primate-retina
#20
Tobias W Weinrich, Michael B Powner, Aisling Lynch, Ravi S Jonnal, John S Werner, Glen Jeffery
In old world primates including humans, cone photoreceptors are classified according to their maximal sensitivity at either short (S, blue), middle (M, green) or long (L, red) wavelengths. Colour discrimination studies show that the S-cone pathway is selectively affected by age and disease, and psychophysical models implicate their loss. Photoreceptors have high metabolic demand and are susceptible to age or disease-related losses in oxygen and nutrient supply. Hence 30% of rods are lost over life. While comparable losses are not seen in cones, S-cones comprise less than 10% of the cone population, so significant loss would be undetected in total counts...
April 12, 2017: Scientific Reports
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