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https://www.readbyqxmd.com/read/28317966/ethylene-polymerization-catalyzed-by-bridging-ni-zn-heterobimetallics
#1
Hsin-Chun Chiu, Arijit Koley, Peter L Dunn, Ryan J Hue, Ian A Tonks
The effect of proximal Zn halides on Ni-catalyzed ethylene polymerization is reported in this work. A series of (NON)NiLX (NON = 2,6-bis-((2,6-diisopropylphenyl)imino)methyl phenoxide; LX = methallyl or L = py, X = tolyl, 2-4) ethylene polymerization precatalysts have been synthesized, as well as a heterobimetallic Ni/Zn complex, (NON)Ni(C4H7)ZnBr2 (5). Each precatalyst could be activated (or promoted) by ZnX2 (X = Cl, Br, Et) to polymerize ethylene. In situ recruitment of ZnX2 by the free imine binding pocket of the NON complexes results in the generation of heterobimetallic active species that produce lower Mn polyethylene than monometallic controls...
March 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28315298/pneumosinus-dilatans-over-100%C3%A2-years-without-an-etiology
#2
Joseph A Ricci
PURPOSE: Pneumosinus dilatans (PD) is a rare pathologic hyperaeration of the paranasal sinuses that causes serious deformation of the overlying bone and soft tissue. The condition occurs most commonly in the frontal sinus of young men who present with different complaints, including cosmetic. More than 100 cases have been reported in the literature since it was first described in 1898; however, the etiology of this condition remains unclear. MATERIALS AND METHODS: A systematic review of all available clinical publications on the subject of PD was conducted in the PubMed electronic database...
February 21, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28306274/low-energy-magnetic-dipole-radiation-in-open-shell-nuclei
#3
R Schwengner, S Frauendorf, B A Brown
Low-energy M1 strength functions of ^{60,64,68}Fe are determined on the basis of large-scale shell-model calculations with the goal to study their development from the bottom to the middle of the neutron shell. We find that the zero-energy spike, which characterizes nuclei near closed shells, develops toward the middle of the shell into a bimodal structure composed of a weaker zero-energy spike and a scissorslike resonance around 3 MeV, where the summed strengths of the two structures change within only 8% around a value of 9...
March 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28306215/primary-mediastinal-and-retroperitoneal-malignant-germ-cell-tumors-in-children-and-adolescents-results-of-the-tgm95-trial-a-study-of-the-french-society-of-pediatric-oncology-soci%C3%A3-t%C3%A3-fran%C3%A3-aise-des-cancers-de-l-enfant
#4
Hélène Sudour-Bonnange, Cécile Faure-Conter, Hélène Martelli, Frederic Hameury, Brice Fresneau, Daniel Orbach, Cécile Vérité
PURPOSE: To examine the clinical presentation, treatment and results in children and adolescents with primary mediastinal (PM) and retroperitoneal (RP) germ cell tumors (GCTs). METHODS: The TGM95 trial for malignant GCTs was conducted in France between 1995 and 2005 to evaluate a strategy adapted to prognostic factors with cisplatin-based chemotherapy and surgical management. We reviewed patients with TGCTs at PM and RP sites. RESULTS: Among 239 patients, there were 16 patients with PM and 5 with RP tumors, which represent 9% of all patients, highlighting the rarity of these extragonadal locations...
March 17, 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/28301392/combined-electric-and-acoustic-stimulation-with-hearing-preservation-effect-of-cochlear-implant-low-frequency-cutoff-on-speech-understanding-and-perceived-listening-difficulty
#5
René H Gifford, Timothy J Davis, Linsey W Sunderhaus, Christine Menapace, Barbara Buck, Jillian Crosson, Lori O'Neill, Anne Beiter, Phil Segel
OBJECTIVE: The primary objective of this study was to assess the effect of electric and acoustic overlap for speech understanding in typical listening conditions using semidiffuse noise. DESIGN: This study used a within-subjects, repeated measures design including 11 experienced adult implant recipients (13 ears) with functional residual hearing in the implanted and nonimplanted ear. The aided acoustic bandwidth was fixed and the low-frequency cutoff for the cochlear implant (CI) was varied systematically...
March 15, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28301390/pre-and-postoperative-binaural-unmasking-for-bimodal-cochlear-implant-listeners
#6
Benjamin M Sheffield, Gerald Schuchman, Joshua G W Bernstein
OBJECTIVES: Cochlear implants (CIs) are increasingly recommended to individuals with residual bilateral acoustic hearing. Although new hearing-preserving electrode designs and surgical approaches show great promise, CI recipients are still at risk to lose acoustic hearing in the implanted ear, which could prevent the ability to take advantage of binaural unmasking to aid speech recognition in noise. This study examined the tradeoff between the benefits of a CI for speech understanding in noise and the potential loss of binaural unmasking for CI recipients with some bilateral preoperative acoustic hearing...
March 15, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28297904/scale-dependent-colocalization-in-a-population-of-gyrotactic-swimmers
#7
M Borgnino, F De Lillo, G Boffetta
We study the small scale clustering of gyrotactic swimmers transported by a turbulent flow, when the intrinsic variability of the swimming parameters within the population is considered. By means of extensive numerical simulations, we find that the variety of the population introduces a characteristic scale R^{*} in its spatial distribution. At scales smaller than R^{*} the swimmers are homogeneously distributed, while at larger scales an inhomogeneous distribution is observed with a fractal dimension close to what observed for a monodisperse population characterized by mean parameters...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28297874/hydrodynamics-wall-slip-and-normal-stress-differences-in-rarefied-granular-poiseuille-flow
#8
Ronak Gupta, Meheboob Alam
Hydrodynamic fields, macroscopic boundary conditions, and non-Newtonian rheology of the acceleration-driven Poiseuille flow of a dilute granular gas are probed using "direct simulation Monte Carlo" method for a range of Knudsen numbers (Kn, the ratio between the mean free path and the macroscopic length), spanning the rarefied regime of slip and transitional flows. It is shown that the "dissipation-induced clustering" (for 1-e_{n}>0, where e_{n} is the restitution coefficient), leading to inhomogeneous density profiles along the transverse direction, competes with "rarefaction-induced declustering" (for Kn>0) phenomenon, leaving seemingly "anomalous" footprints on several hydrodynamic and rheological quantities; one example is the well-known rarefaction-induced temperature bimodality, which could also result from inelastic dissipation that dominates in the continuum limit (Kn→0) as found recently [Alam et al...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28290585/size-and-property-bimodality-in-magnetic-nanoparticle-dispersions-single-domain-particles-vs-strongly-coupled-nanoclusters
#9
E Wetterskog, A Castro, L Zeng, S Petronis, D Heinke, E Olsson, L Nilsson, N Gehrke, P Svedlindh
The widespread use of magnetic nanoparticles in the biotechnical sector puts new demands on fast and quantitative characterization techniques for nanoparticle dispersions. In this work, we report the use of asymmetric flow field-flow fractionation (AF4) and ferromagnetic resonance (FMR) to study the properties of a commercial magnetic nanoparticle dispersion. We demonstrate the effectiveness of both techniques when subjected to a dispersion with a bimodal size/magnetic property distribution: i.e., a small superparamagnetic fraction, and a larger blocked fraction of strongly coupled colloidal nanoclusters...
March 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28288559/erratum-to-bimodal-dynamics-of-primary-metabolism-related-responses-in-tolerant-potato-potato-virus-y-interaction
#10
Tjaša Stare, Živa Ramšak, Andrej Blejec, Katja Stare, Neža Turnšek, Wolfram Weckwerth, Stefanie Wienkoop, Dominik Vodnik, Kristina Gruden
No abstract text is available yet for this article.
March 13, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28284133/monitoring-and-source-apportionment-of-trace-elements-in-pm2-5-implications-for-local-air-quality-management
#11
Yueyan Li, Miao Chang, Shanshan Ding, Shiwen Wang, Dun Ni, Hongtao Hu
Fine particulate matter (PM2.5) samples were collected simultaneously every hour in Beijing between April 2014 and April 2015 at five sites. Thirteen trace elements (TEs) in PM2.5 were analyzed by online X-ray fluorescence (XRF). The annual average PM2.5 concentrations ranged from 76.8 to 102.7 μg m(-3). TEs accounted for 5.9%-8.7% of the total PM2.5 mass with Cl, S, K, and Si as the most dominant elements. Spearman correlation coefficients of PM2.5 or TE concentrations between the background site and other sites showed that PM2...
March 8, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28281256/label-free-biosensors-based-on-bimodal-waveguide-bimw-interferometers
#12
Sonia Herranz, Adrián Fernández Gavela, Laura M Lechuga
The bimodal waveguide (BiMW) sensor is a novel common path interferometric transducer based on the evanescent field detection principle, which in combination with a bio-recognition element allows the direct detection of biomolecular interactions in a label-free scheme. Due to its inherent high sensitivity it has great potential to become a powerful analytical tool for monitoring substances of interest in areas such as environmental control, medical diagnostics and food safety, among others. The BiMW sensor is fabricated using standard silicon-based technology allowing cost-effective production, and meeting the requirements of portability and disposability necessary for implementation in a point-of-care (POC) setting...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28280885/acute-stress-worsens-the-deficits-in-appetitive-behaviors-for-social-and-sexual-stimuli-displayed-by-rats-after-long-term-withdrawal-from-morphine
#13
Yunjing Bai, David Belin, Xigeng Zheng, Zhengkui Liu, Yue Zhang
RATIONALE: Negative affective states, e.g., anhedonia, are suggested to be involved in the long-lasting motivational processes associated with relapse. Here, we investigated whether anhedonic behaviors could be elicited by an acute stress after protracted abstinence from morphine. OBJECTIVES: The behavioral responses to natural stimuli following exposure to an acute stress were examined after 14 days of withdrawal from morphine. Male rats were pretreated with either a binge-like morphine regimen or daily saline injections for 5 days...
March 9, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28280057/discourses-of-prejudice-in-the-professions-the-case-of-sign-languages
#14
Tom Humphries, Poorna Kushalnagar, Gaurav Mathur, Donna Jo Napoli, Carol Padden, Christian Rathmann, Scott Smith
There is no evidence that learning a natural human language is cognitively harmful to children. To the contrary, multilingualism has been argued to be beneficial to all. Nevertheless, many professionals advise the parents of deaf children that their children should not learn a sign language during their early years, despite strong evidence across many research disciplines that sign languages are natural human languages. Their recommendations are based on a combination of misperceptions about (1) the difficulty of learning a sign language, (2) the effects of bilingualism, and particularly bimodalism, (3) the bona fide status of languages that lack a written form, (4) the effects of a sign language on acquiring literacy, (5) the ability of technologies to address the needs of deaf children and (6) the effects that use of a sign language will have on family cohesion...
March 9, 2017: Journal of Medical Ethics
https://www.readbyqxmd.com/read/28278452/identification-of-ultrasonic-echolucent-carotid-plaques-using-discrete-fr%C3%A3-chet-distance-between-bimodal-gamma-distributions
#15
Xiaowei Huang, Yanling Zhang, Long Meng, Ming Qian, Kelvin Wong, Derek Abbott, Rongqin Zheng, Hairong Zheng, Lili Niu
OBJECTIVE: Echolucent carotid plaques are associated with acute cardiovascular and cerebrovascular events (ACCEs) in atherosclerotic patients. The aim of this study was to develop a computer-aided method for identifying echolucent plaques. METHODS: A total of 315 ultrasound images of carotid plaques (105 echo-rich, 105 intermediate and 105 echolucent) collected from 153 patients were included in this study. A bimodal gamma distribution was proposed to model the pixel statistics in the gray scale images of plaques...
March 1, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28278159/combined-regimen-of-photodynamic-therapy-mediated-by-gallium-phthalocyanine-chloride-and-metformin-enhances-anti-melanoma-efficacy
#16
Diana Tudor, Iuliana Nenu, Gabriela Adriana Filip, Diana Olteanu, Mihai Cenariu, Flaviu Tabaran, Rodica Mariana Ion, Lucian Gligor, Ioana Baldea
BACKGROUND: Melanoma therapy is challenging, especially in advanced cases, due to multiple developed tumor defense mechanisms. Photodynamic therapy (PDT) might represent an adjuvant treatment, because of its bimodal action: tumor destruction and immune system awakening. In this study, a combination of PDT mediated by a metal substituted phthalocyanine-Gallium phthalocyanine chloride (GaPc) and Metformin was used against melanoma. The study aimed to: (1) find the anti-melanoma efficacy of GaPc-PDT, (2) assess possible beneficial effects of Metformin addition to PDT, (3) uncover some of the mechanisms underlining cell killing and anti-angiogenic effects...
2017: PloS One
https://www.readbyqxmd.com/read/28276019/detection-of-dual-targeting-and-dual-function-of-mitochondrial-proteins-in-yeast
#17
Reut Ben-Menachem, Ophry Pines
Eukaryotic cells are defined by the existence of subcellular compartments and organelles. The localization of a protein to a specific subcellular compartment is one of the most fundamental processes of a living cell. It is well documented that in eukaryotic cells molecules of a single protein can be located in more than one subcellular compartment, a phenomenon termed dual targeting, bimodal targeting, or dual localization. Recently, growing evidence started to accumulate for abundant dual targeting of mitochondrial proteins, which are localized to a second location in the cell, besides this specific organelle...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28275990/the-dynamics-of-multimodal-integration-the-averaging-diffusion-model
#18
Brandon M Turner, Juan Gao, Scott Koenig, Dylan Palfy, James L McClelland
We combine extant theories of evidence accumulation and multi-modal integration to develop an integrated framework for modeling multimodal integration as a process that unfolds in real time. Many studies have formulated sensory processing as a dynamic process where noisy samples of evidence are accumulated until a decision is made. However, these studies are often limited to a single sensory modality. Studies of multimodal stimulus integration have focused on how best to combine different sources of information to elicit a judgment...
March 8, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/28275346/manipulating-bodily-presence-affects-cross-modal-spatial-attention-a-virtual-reality-based-erp-study
#19
Ville J Harjunen, Imtiaj Ahmed, Giulio Jacucci, Niklas Ravaja, Michiel M Spapé
Earlier studies have revealed cross-modal visuo-tactile interactions in endogenous spatial attention. The current research used event-related potentials (ERPs) and virtual reality (VR) to identify how the visual cues of the perceiver's body affect visuo-tactile interaction in endogenous spatial attention and at what point in time the effect takes place. A bimodal oddball task with lateralized tactile and visual stimuli was presented in two VR conditions, one with and one without visible hands, and one VR-free control with hands in view...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28273971/clinico-pathological-spectrum-of-ophthalmic-lesions-an-experience-in-tertiary-care-hospital-of-central-india
#20
Yashita Gupta, Renuka Gahine, Nighat Hussain, Mohd Jafar Memon
INTRODUCTION: Ophthalmic lesions show varied distribution on the basis of geographical location. Eye being a unique sensory organ needs to be studied both clinically and pathologically. AIM: This study was aimed to evaluate the histomorphological and clinico-pathlological spectrum of ophthalmic lesions at a tertiary care hospital of Central India. MATERIALS AND METHODS: We reviewed all the ophthalmic biopsies performed in the Department of Pathology of our institute between January 2008 and November 2014...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
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