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https://www.readbyqxmd.com/read/29151194/highly-immersive-virtual-reality-laparoscopy-simulation-development-and-future-aspects
#1
Tobias Huber, Tom Wunderling, Markus Paschold, Hauke Lang, Werner Kneist, Christian Hansen
PURPOSE: Virtual reality (VR) applications with head-mounted displays (HMDs) have had an impact on information and multimedia technologies. The current work aimed to describe the process of developing a highly immersive VR simulation for laparoscopic surgery. METHODS: We combined a VR laparoscopy simulator (LapSim) and a VR-HMD to create a user-friendly VR simulation scenario. Continuous clinical feedback was an essential aspect of the development process. We created an artificial VR (AVR) scenario by integrating the simulator video output with VR game components of figures and equipment in an operating room...
November 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29150729/effect-of-microemulsion-structure-on-fluorescence-and-nonlinear-optical-properties-of-rhodamine-6g
#2
M Pourtabrizi, N Shahtahmassebi, A Kompany, S Sharifi
This study is conducted to investigate the effect of nano-droplets concentration and size on linear and nonlinear optical properties of Rhodamine 6G by UV-Vis, spectrofluorometer and Z-Scan techniques. Nano-droplets were prepared by mixture of AOT, n-Decane and Water at three different water to surfactant molar ratios (W = 3, 6.7 and 40) and two dye to water mass ratios (R). At high enough dye concentration, the fluorescence intensity and its red shift depend on the concentration of dye in water nano-droplets (R)...
November 18, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/29150714/stochastic-lotka-volterra-food-chains
#3
Alexandru Hening, Dang H Nguyen
We study the persistence and extinction of species in a simple food chain that is modelled by a Lotka-Volterra system with environmental stochasticity. There exist sharp results for deterministic Lotka-Volterra systems in the literature but few for their stochastic counterparts. The food chain we analyze consists of one prey and [Formula: see text] predators. The jth predator eats the [Formula: see text]th species and is eaten by the [Formula: see text]th predator; this way each species only interacts with at most two other species-the ones that are immediately above or below it in the trophic chain...
November 17, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/29150674/quantum-steerability-based-on-joint-measurability
#4
Zhihua Chen, Xiangjun Ye, Shao-Ming Fei
Occupying a position between entanglement and Bell nonlocality, Einstein-Podolsky-Rosen (EPR) steering has attracted increasing attention in recent years. Many criteria have been proposed and experimentally implemented to characterize EPR-steering. Nevertheless, only a few results are available to quantify steerability using analytical results. In this work, we propose a method for quantifying the steerability in two-qubit quantum states in the two-setting EPR-steering scenario, using the connection between joint measurability and steerability...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29150623/effective-mechanical-properties-of-multilayer-nano-heterostructures
#5
T Mukhopadhyay, A Mahata, S Adhikari, M Asle Zaeem
Two-dimensional and quasi-two-dimensional materials are important nanostructures because of their exciting electronic, optical, thermal, chemical and mechanical properties. However, a single-layer nanomaterial may not possess a particular property adequately, or multiple desired properties simultaneously. Recently a new trend has emerged to develop nano-heterostructures by assembling multiple monolayers of different nanostructures to achieve various tunable desired properties simultaneously. For example, transition metal dichalcogenides such as MoS2 show promising electronic and piezoelectric properties, but their low mechanical strength is a constraint for practical applications...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29150418/immune-enhancing-formulas-for-patients-with-cancer-undergoing-esophagectomy-systematic-review-protocol
#6
Astrid Naranjo, Elizabeth Isenring, Laisa Teleni
BACKGROUND: Adult patients with an esophageal cancer can potentially be compromised with postoperative leaks or fistulae if patients' nutritional status is in a vulnerable stage. Currently in Australia, there is a growing need for clinicians to know whether use of immune-enhancing formulas (IEFs) containing Arg, omega-3, and RNA are a cost-effective approach compared with isonitrogenous-isocaloric formulas to reduce postoperative infectious complications in esophagectomy patients. Since IEFs may carry higher costs, this has led to inconsistencies in practice among clinicians and hospitals...
November 17, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/29149898/detection-of-plasmodium-falciparum-male-and-female-gametocytes-and-determination-of-parasite-sex-ratio-in-human-endemic-populations-by-novel-cheap-and-robust-rtqpcr-assays
#7
Federica Santolamazza, Pamela Avellino, Giulia Siciliano, Franck Adama Yao, Fabrizio Lombardo, Jean Bosco Ouédraogo, David Modiano, Pietro Alano, Valentina Dianora Mangano
BACKGROUND: The presence of Plasmodium falciparum gametocytes in peripheral blood is essential for human to mosquito parasite transmission. The detection of submicroscopic infections with gametocytes and the estimation of the gametocyte sex ratio are crucial to assess the human host potential ability to infect mosquitoes and transmit malaria parasites. AIM AND OBJECTIVES: The aim of this work was to develop sensitive and cheap Real Time qPCR assays for large-scale epidemiological surveys, based on detection and amplification of gametocyte sex specific transcripts selected from the literature: the female-specific pfs25 and pf glycerol kinase (pfGK) and the male-specific pfs230p and pf13 transcripts...
November 17, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29149787/the-role-of-the-home-environment-in-dementia-care-and-support-systematic-review-of-qualitative-research
#8
Dia Soilemezi, Amy Drahota, John Crossland, Rebecca Stores
Background The domestic home is the preferred site for care provision for people with dementia and their families, therefore creating a dementia and caring friendly home environment is crucial. This systematic review synthesised qualitative studies to explore the role of the home environment and identify potential barriers and facilitators in home dementia care and support to inform future practice and research. Methods A systematic search in 12 databases identified international qualitative literature on perceptions and experiences of community-dwelling people with dementia, family and formal carers regarding the role of the home environment and ways to tackle daily challenges...
January 1, 2017: Dementia
https://www.readbyqxmd.com/read/29149422/interrelationships-among-hydrogen-permeation-physiochemical-properties-and-early-adsorption-abilities-of-titanium
#9
Fang Jia, Lei Zhou, Wangxi Wu
This study aimed to investigate if the titanium samples with low hydrogen permeation which treated with a novel etching combination: phosphoric acid and sodium fluoride could influence the surface physiochemical properties and early adsorption ability. Titanium samples were treated with three different concentrations of the new formula, as groups A, B and C, and treated with the traditional etching formula, as group T. Zeta potential, contact angle, X-ray photoelectron spectroscopy (XPS) and fibronectin (FN)/vitronectin (VN) adsorption of Sprague-Dawley (SD) rat tibial osteotomies in the initial 30min and MG-63 adsorption in the initial 24 h were detected...
November 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29149377/multi-patch-and-multi-group-epidemic-models-a-new-framework
#10
Derdei Bichara, Abderrahman Iggidr
We develop a multi-patch and multi-group model that captures the dynamics of an infectious disease when the host is structured into an arbitrary number of groups and interacts into an arbitrary number of patches where the infection takes place. In this framework, we model host mobility that depends on its epidemiological status, by a Lagrangian approach. This framework is applied to a general SEIRS model and the basic reproduction number [Formula: see text] is derived. The effects of heterogeneity in groups, patches and mobility patterns on [Formula: see text] and disease prevalence are explored...
November 17, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/29147824/an-integrated-qsar-modeling-approach-to-explore-the-structure-property-and-selectivity-relationships-of-n-benzoyl-l-biphenylalanines-as-integrin-antagonists
#11
Sk Abdul Amin, Nilanjan Adhikari, Sonam Bhargava, Shovanlal Gayen, Tarun Jha
Integrins [Formula: see text] and [Formula: see text] are important targets to treat different inflammatory diseases, such as multiple sclerosis, inflammatory bowel diseases, rheumatoid arthritis, atherosclerosis, and asthma. Despite being valuable targets, only a few work has been reported to date regarding molecular modeling studies on these integrins. Not only that, none of these reports addressed the selectivity issue between integrins [Formula: see text] and [Formula: see text]. Therefore, a major challenge regarding the design and discovery of selective integrin antagonists remains...
November 17, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/29147785/qt-interval-and-dispersion-in-drug-free-anorexia-nervosa-adolescents-a-case-control-study
#12
Monica Bomba, Lucio Tremolizzo, Fabiola Corbetta, Franco Nicosia, Francesca Lanfranconi, Gianni Poggioli, Karine Goulene, Marco Stramba-Badiale, Elisa Conti, Francesca Neri, Renata Nacinovich
Long QT values have been reported in patients with anorexia nervosa of the restricting type (ANr) potentially increasing the risk of fatal arrhythmia, especially if psychotropic drug treatment is required. Nevertheless, the previous studies on this topic are biased by drug exposure, long disease durations, and small sample sizes. This study is aimed at assessing QTc and QTcd values in ANr adolescents with recent onset and drug free, as compared to subjects affected by psychiatric disorders other than ANr. We evaluated QTc and its dispersion (QTcd) in a population of 77 drug-free ANr female adolescents and compared to an equal number of healthy controls (H-CTRL) and pathological controls (P-CTRL, mixed psychiatric disorders)...
November 16, 2017: European Child & Adolescent Psychiatry
https://www.readbyqxmd.com/read/29147142/analysis-of-functional-brain-connections-for-positive-negative-emotions-using-phase-locking-value
#13
Yasar Dasdemir, Esen Yildirim, Serdar Yildirim
In this study, we investigate the brain networks during positive and negative emotions for different types of stimulus (audio only, video only and audio + video) in [Formula: see text], and [Formula: see text] bands in terms of phase locking value, a nonlinear method to study functional connectivity. Results show notable hemispheric lateralization as phase synchronization values between channels are significant and high in right hemisphere for all emotions. Left frontal electrodes are also found to have control over emotion in terms of functional connectivity...
December 2017: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/29146983/precise-control-of-alloying-sites-of-bimetallic-nanoclusters-via-surface-motif-exchange-reaction
#14
Qiaofeng Yao, Yan Feng, Victor Fung, Yong Yu, De-En Jiang, Jun Yang, Jianping Xie
Precise control of alloying sites has long been a challenging pursuit, yet little has been achieved for the atomic-level manipulation of metallic nanomaterials. Here we describe utilization of a surface motif exchange (SME) reaction to selectively replace the surface motifs of parent [Ag44(SR)30](4-) (SR = thiolate) nanoparticles (NPs), leading to bimetallic NPs with well-defined molecular formula and atomically-controlled alloying sites in protecting shell. A systematic mass (and tandem mass) spectrometry analysis suggests that the SME reaction is an atomically precise displacement of SR-Ag(I)-SR-protecting modules of Ag NPs by the incoming SR-Au(I)-SR modules, giving rise to a core-shell [Ag32@Au12(SR)30](4-)...
November 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/29146981/fast-forwarding-of-hamiltonians-and-exponentially-precise-measurements
#15
Yosi Atia, Dorit Aharonov
The time-energy uncertainty relation (TEUR) [Formula: see text] holds if the Hamiltonian is completely unknown, but can be violated otherwise; here we initiate a rigorous study describing when and to what extent such violations can occur. To this end, we propose a computational version of the TEUR (cTEUR), in which Δt is replaced by the computational complexity of simulating the measurement. cTEUR violations are proved to occur if and only if the Hamiltonian can be fast forwarded (FF), namely, simulated for time t with complexity significantly smaller than t...
November 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/29146940/development-and-physiological-effects-of-an-artificial-diet-for-wolbachia-infected-aedes-aegypti
#16
Heverton Leandro Carneiro Dutra, Silvia Lomeu Rodrigues, Simone Brutman Mansur, Sofia Pimenta de Oliveira, Eric Pearce Caragata, Luciano Andrade Moreira
The endosymbiotic bacterium Wolbachia spreads rapidly through populations of Aedes aegypti mosquitoes, and strongly inhibits infection with key human pathogens including the dengue and Zika viruses. Mosquito control programs aimed at limiting transmission of these viruses are ongoing in multiple countries, yet there is a dearth of mass rearing infrastructure specific to Wolbachia-infected mosquitoes. One example is the lack of a blood meal substitute, which accounts for the Wolbachia-specific physiological changes in infected mosquitoes, that allows the bacterium to spread, and block viral infections...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146670/three-vessel-assessment-of-coronary-microvascular-dysfunction-in-patients-with-clinical-suspicion-of-ischemia-prospective-observational-study-with-the-index-of-microcirculatory-resistance
#17
Yuhei Kobayashi, Joo Myung Lee, William F Fearon, Jang Hoon Lee, Takeshi Nishi, Dong-Hyun Choi, Frederik M Zimmermann, Ji-Hyun Jung, Hyun-Jung Lee, Joon-Hyung Doh, Chang-Wook Nam, Eun-Seok Shin, Bon-Kwon Koo
BACKGROUND: Difficulty directly visualizing the coronary microvasculature as opposed to the epicardial coronary artery makes its assessment challenging. The goal of this study is to measure the index of microcirculatory resistance (IMR) in all 3 major coronary vessels to identify the clinical and angiographic predictors of an abnormal IMR. METHODS AND RESULTS: Ninety-three patients who underwent coronary physiological assessment in all 3 major coronary vessels were prospectively enrolled (59...
November 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29146480/neuroprotection-by-chotosan-a-kampo-formula-against-glutamate-excitotoxicity-involves-the-inhibition-of-glun2b-but-not-glun2a-containing-nmda-receptor-mediated-responses-in-primary-cultured-cortical-neurons
#18
Sachie Sasaki-Hamada, Azusa Suzuki, Emi Sanai, Kinzo Matsumoto, Jun-Ichiro Oka
Chotosan (CTS), a traditional herbal formula called Kampo medicine, was shown to be effective in the treatment of vascular dementia in a clinical study, and exerted protective effects against transient cerebral ischemia-induced cognitive impairment in mice. In the present study, we investigated the neuroprotective effects of CTS using primary cultured rat cortical neurons. CTS (250-1000 μg/mL) inhibited neuronal death induced by 100 μM glutamate. This glutamate-induced neuronal death was blocked by a GluN2B-, but not GluN2A-containing NMDA receptor antagonist...
November 1, 2017: Journal of Pharmacological Sciences
https://www.readbyqxmd.com/read/29146142/visceral-adiposity-index-as-a-predictor-of-chronic-kidney-disease-in-a-relatively-healthy-population-in-taiwan
#19
Yi-Chuan Chen, Shih-Han Lai, Yi-Wen Tsai, Shy-Shin Chang
OBJECTIVES: Abdominal obesity is an independent risk factor for cardiovascular disease and chronic kidney disease (CKD). Visceral adiposity index (VAI), a simple formula representing visceral adipose dysfunction, has already been proven to have a strong correlation with various cardiometabolic disorders. Limited studies are available regarding the relationship between VAI and renal function decline. Therefore, the purpose of this study was to evaluate the relationship between VAI and renal function and to estimate the risk of chronic kidney disease in a relatively healthy adult population in Taiwan...
November 14, 2017: Journal of Renal Nutrition
https://www.readbyqxmd.com/read/29145929/ciprofloxacin-does-not-prolong-the-qtc-interval-a-clinical-study-in-icu-patients-and-review-of-the-literature
#20
Charlotte Heemskerk, Evelien Woldman, Marieke Pereboom, Ruud Van der Hoeven, Aukje Mantel-Teeuwisse, Claudia Van Gemeren, Matthijs Lambertus Becker
PURPOSE: Ciprofloxacin may prolong the QT interval and increase the risk of Torsade de Pointes (TdP). Intravenous administration of ciprofloxacin in patients with additional risks may elevate the risk of QTc interval prolongation. We prospectively assessed whether intravenous ciprofloxacin prolongs the QT interval in patients with additional co-morbidities and risk factors. We also reviewed the literature on the QT prolonging effect or TdP inducing effect of ciprofloxacin. METHODS: ICU Patients who were treated with intravenous ciprofloxacin as part of their therapy were recruited...
2017: Journal of Pharmacy & Pharmaceutical Sciences: a Publication of the Canadian Society for Pharmaceutical Sciences
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