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https://www.readbyqxmd.com/read/28522836/dynamics-of-oscillators-globally-coupled-via-two-mean-fields
#1
Xiyun Zhang, Arkady Pikovsky, Zonghua Liu
Many studies of synchronization properties of coupled oscillators, based on the classical Kuramoto approach, focus on ensembles coupled via a mean field. Here we introduce a setup of Kuramoto-type phase oscillators coupled via two mean fields. We derive stability properties of the incoherent state and find traveling wave solutions with different locking patterns; stability properties of these waves are found numerically. Mostly nontrivial states appear when the two fields compete, i.e. one tends to synchronize oscillators while the other one desynchronizes them...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28494155/principles-for-tuning-hydrophobic-ligand-receptor-binding-kinetics
#2
Gregor Weiß, Piotr Setny, Joachim Dzubiella
We investigate how to tune the rate of hydrophobic ligand-receptor association due to the role of solvent in adjustable receptor pockets by explicit-water molecular dynamics (MD) simulations. Our model considers the binding of a spherical ligand (key/guest) to a concave surface recess in a non-polar wall as receptor (lock/host). We systematically modify the receptor's physicochemical properties in terms of geometry and dispersion attraction which, in turn, alter the water occupancy and fluctuations within the pocket...
May 11, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28490835/from-non-preemptive-to-preemptive-scheduling-using-synchronization-synthesis
#3
Pavol Černý, Edmund M Clarke, Thomas A Henzinger, Arjun Radhakrishna, Leonid Ryzhyk, Roopsha Samanta, Thorsten Tarrach
We present a computer-aided programming approach to concurrency. The approach allows programmers to program assuming a friendly, non-preemptive scheduler, and our synthesis procedure inserts synchronization to ensure that the final program works even with a preemptive scheduler. The correctness specification is implicit, inferred from the non-preemptive behavior. Let us consider sequences of calls that the program makes to an external interface. The specification requires that any such sequence produced under a preemptive scheduler should be included in the set of sequences produced under a non-preemptive scheduler...
2017: Formal Methods in System Design
https://www.readbyqxmd.com/read/28484068/delivery-of-health-coaching-by-medical-assistants-in-primary-care
#4
Zora Djuric, Michelle Segar, Carissa Orizondo, Jeffrey Mann, Maya Faison, Nithin Peddireddy, Matthew Paletta, Amy Locke
BACKGROUND: Health coaching is potentially a practical method to assist patients in achieving and maintaining healthy lifestyles. In health coaching, the coach partners with the patient, helping patients discover their own strengths, challenges, and solutions. METHODS: Two medical assistants were provided with brief training. The 12-week program consisted of telephone coaching with in-person visits at the beginning and end of the program. Coaching targeted improvements in diet, physical activity, and/or sleep habits using a self-care planning form...
May 2017: Journal of the American Board of Family Medicine: JABFM
https://www.readbyqxmd.com/read/28481531/chemically-induced-breathing-of-flexible-porphyrinic-covalent-cages
#5
Laetitia Schoepff, Lucas Kocher, Stéphanie Durot, Valérie Heitz
The synthesis of two flexible bis-porphyrin cages 3 and 4, incorporating respectively Zn(II) porphyrins and free-base porphyrins is reported. In both cages, the four covalent linkers that bind the two porphyrins are functionalized with two 1,2,3-triazolyl ligands. These cages were characterized by NMR and HRMS and for cage 3 incorporating 1,4-diazabicyclo[2.2.2]octane (DABCO), an X-ray crystallographic structure was obtained. Chemically-induced conformational changes are studied and compared to the ones of two related cages with longer flexible linkers...
May 8, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28470316/top-down-fabrication-meets-bottom-up-synthesis-for-nanoelectronic-barcoding-of-microparticles
#6
Pengfei Xie, Xinnan Cao, Zhongtian Lin, Mehdi Javanmard
Traditional optical and plasmonic techniques for barcoding of micro-particles for multiplexed bioassays are generally high in throughput, however bulky instrumentation is often required for performing readout. Electrical impedance based detection allows for ultra-compact instrumentation footprint necessary for wearable devices, however to date, the lack of ability to electronically barcode micro-particles has been a long standing bottleneck towards enabling multiplexed electronic biomarker assays. Nanoelectronic barcoding, which to the best of our knowledge is the first impedance based solution for micro-particle barcoding, works by forming tunable nano-capacitors on the surface of micro-spheres, effectively modulating the frequency dependent dielectric properties of the spheres allowing one bead barcode to be distinguished from another...
May 4, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28463827/taurolidine-citrate-lock-therapy-for-primary-prevention-of-catheter-related-infections-in-cancer-patients-results-of-a-prospective-randomized-phase-iv-trial-atapac
#7
Raffaele Longo, Mathieu Llorens, Christophe Goetz, Christian Platini, Nada Eid, Jocelyne Sellies, Nadia Ouamara, Philippe Quétin
BACKGROUND: Totally implantable venous access port (TIVAP)-related infections (RIs) remain a serious health problem in cancer patients receiving an intravenous (i.v.) therapy. PATIENTS AND METHODS: The ATAPAC study was a prospective, randomized, monocentric, phase IV trial evaluating the efficacy of taurolidine lock solution versus standard saline solution for primary TIVAP-RI prevention in nonhematological cancer patients receiving i.v. chemotherapy. The primary endpoint was the TIVAP-RI incidence rate...
May 3, 2017: Oncology
https://www.readbyqxmd.com/read/28460873/long-term-therapeutic-effects-of-dextrose-prolotherapy-in-patients-with-hypermobility-of-the-temporomandibular-joint-a-single-arm-study-with-1-4-years-follow-up
#8
H Refai
The aim was to analyse the short-term and long-term therapeutic efficacy of dextrose prolotherapy for dislocation or subluxation (hypermobility) of the temporomandibular joint (TMJ). Sixty-one patients with symptomatic hypermobility of the TMJ were included in this single-arm prospective study, in which they were each given four sessions of intra-articular and pericapsular injections six weeks apart. Each injection comprised 10% dextrose/mepivacaine solution 3ml. Clinical outcomes including severity of pain on movement according to the numerical rating scale (NRS), maximal interincisal opening, clicking, and frequency of locking were measured before treatment (T1), during treatment (T2) (just before the third session of injections), at the short-term follow-up (T3) (three months after treatment), and at the long-term follow-up (T4) (1-4 years after treatment)...
April 28, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28453851/eradication-of-staphylococcus-aureus-biofilm-infections-using-synthetic-antimicrobial-peptides
#9
Marta Zapotoczna, Éanna Forde, Siobhan Hogan, Hilary Humphreys, James P O'Gara, Deirdre Fitzgerald-Hughes, Marc Devocelle, Eoghan O'Neill
Here, we demonstrate that antimicrobial peptides (AMPs) are an effective antibiofilm treatment when applied as catheter lock solutions (CLSs) against S. aureus biofilm infections. The activity of synthetic AMPs (Bac8c, HB43, P18, Omiganan, WMR, Ranalexin, and Polyphemusin) was measured against early and mature biofilms produced by methicillin-resistant S. aureus and methicillin-susceptible S. aureus isolates from patients with device-related infections grown under in vivo-relevant biofilm conditions. The cytotoxic and hemolytic activities of the AMPs against human cells and their immunomodulatory potential in human blood were also characterized...
March 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28449854/complications-of-intramedullary-nailing-evolution-of-treatment
#10
Dirk Wähnert, Dominic Gehweiler
Intramedullary nailing of diaphyseal long bone fractures is a standard procedure in today's trauma and orthopedic surgery due to the numerous advantages (e.g. minimal invasive, limited soft tissue damage, load stability). In the last decade indications have been extended to the metaphyseal region. This was associated with problems and complications due to the reduced bone-implant interface. The changed anatomical conditions lead to decreased implant anchorage. Newly developed locking solutions overcome most of these problems...
April 24, 2017: Injury
https://www.readbyqxmd.com/read/28438824/comparison-of-linezolid-and-vancomycin-lock-solutions-with-and-without-heparin-against-biofilm-producing-bacteria
#11
Megan K Luther, Leonard A Mermel, Kerry L LaPlante
PURPOSE: The activity of linezolid and vancomycin lock solutions against biofilm-producing strains of Staphylococcus aureus, S. epidermidis, and Enterococcus faecalis was studied. METHODS: Two strains each of methicillin-susceptible S. aureus (MSSA), methicillin-resistant S. aureus (MRSA), and S. epidermidis, and 1 strain of vancomycin-susceptible E. faecalis and vancomycin-resistant E. faecalis were tested against vancomycin and linezolid to assess prevention of biofilm formation and eradication of these pathogens within a formed biofilm...
May 1, 2017: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/28433011/ramped-amplitude-novel
#12
T V Can, R T Weber, J J Walish, T M Swager, R G Griffin
We present a pulsed dynamic nuclear polarization (DNP) study using a ramped-amplitude nuclear orientation via electron spin locking (RA-NOVEL) sequence that utilizes a fast arbitrary waveform generator (AWG) to modulate the microwave pulses together with samples doped with narrow-line radicals such as 1,3-bisdiphenylene-2-phenylallyl (BDPA), sulfonated-BDPA (SA-BDPA), and trityl-OX063. Similar to ramped-amplitude cross polarization in solid-state nuclear magnetic resonance, RA-NOVEL improves the DNP efficiency by a factor of up to 1...
April 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28429519/the-incidence-and-costs-of-bacteremia-due-to-lack-of-gentamicin-lock-solutions-for-dialysis-catheters
#13
Tze Liang Goh, Jason Wei, David Semple, John Collins
The use of antibiotic lock solutions as prophylaxis for catheter-associated blood stream infection (CRBSI) has been shown to be effective in previous randomized controlled trials. However, the cost-effectiveness of this approach had not been studied. In 2012, the routine gentamicin-heparin lock solution used in Auckland City Hospital was withdrawn from the market, leading to a change to heparin-only lock. This was then replaced with gentamicin-citrate lock in 2014. This situation allowed review of the CRBSI rate and financial impact of different catheter lock solutions...
June 2017: Nephrology
https://www.readbyqxmd.com/read/28424515/structure-and-allosteric-inhibition-of-excitatory-amino-acid-transporter-1
#14
Juan C Canul-Tec, Reda Assal, Erica Cirri, Pierre Legrand, Sébastien Brier, Julia Chamot-Rooke, Nicolas Reyes
Human members of the solute carrier 1 (SLC1) family of transporters take up excitatory neurotransmitters in the brain and amino acids in peripheral organs. Dysregulation of the function of SLC1 transporters is associated with neurodegenerative disorders and cancer. Here we present crystal structures of a thermostabilized human SLC1 transporter, the excitatory amino acid transporter 1 (EAAT1), with and without allosteric and competitive inhibitors bound. The structures reveal architectural features of the human transporters, such as intra- and extracellular domains that have potential roles in transport function, regulation by lipids and post-translational modifications...
April 27, 2017: Nature
https://www.readbyqxmd.com/read/28416559/a-novel-non-antibiotic-nitroglycerin-based-catheter-lock-solution-for-the-prevention-of-intraluminal-central-venous-catheter-infections-in-cancer-patients
#15
Anne-Marie Chaftari, Ray Hachem, Ariel Szvalb, Mahnaz Taremi, Bruno Granwehr, George Michael Viola, Amin Sapna, Andrew Assaf, Numan Yazan, Pankil Shah, Ketevan Gasitashvili, Elizabeth Natividad, Ying Jiang, Rebecca Slack, Ruth Reitzel, Joel Rosenblatt, Elie Mouhayar, Issam Raad
Background: For long-term central lines (CL), the lumen is the major source of central line associated bloodstream infections (CLABSI). Current standard of care for maintaining catheter patency includes flushing the CL with saline or heparin. Neither agent has any antimicrobial activity. Furthermore heparin may enhance staphylococcal biofilm formation. We evaluated the safety and efficacy of a novel non-antibiotic catheter lock solution for the prevention of CLABSI.Patients and Methods: Between November 2015, and February 2016, we enrolled 60 patients with hematologic malignancies who had peripherally inserted central catheter (PICC) to receive the study lock solution...
April 17, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28415937/heparinized-saline-versus-normal-saline-for-maintaining-peripheral-venous-catheter-patency-in-china-an-open-label-randomized-controlled-study
#16
Lichun Xu, Yan Hu, Xiaojin Huang, Jianguo Fu, Jinhui Zhang
Objective To evaluate the effects of heparin saline versus normal saline as locking solution for maintaining patency in peripheral venous catheters in Chinese patients. Methods This open-label, randomized controlled study was conducted in two hepatobiliary surgery wards, where patients received identical treatments, at a tertiary referral hospital. Patients were randomly divided into a normal saline group (NS, 3 ml) or a heparin saline group (HS, 50 IU/ml, 3 ml) for catheter sealing. Results The study enrolled 286 patients and 609 peripheral venous catheters were included in the analysis...
April 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/28407499/alleviation-of-heavy-metal-toxicity-and-phytostimulation-of-brassica-campestris-l-by-endophytic-mucor-sp-mhr-7
#17
Mahwish Zahoor, Muhammad Irshad, Hazir Rahman, Muhammad Qasim, Sahib Gul Afridi, Muhammad Qadir, Anwar Hussain
Heavy metal (HM) pollution is of great concern in countries like Pakistan where a huge proportion of human population is exposed to it. These toxic metals are making their way from water bodies to soil where it not only interferes with plant growth and development but also initiates serious health issues in human consuming the produce of such soils. Bioremediation is one of the most viable and efficient solution for the problem. Purpose of the current study was to isolate endophytic fungi from plants grown on HM contaminated soil and screen them for their ability to tolerate multiple HM including chromium (Cr(6+)), manganese (Mn(2+)), cobalt (Co(2+)), copper (Cu(2+)) and zinc (Zn(2+))...
April 10, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28380977/several-nanosecond-nd-yvo-sub-4-sub-lasers-q-switched-by-two-dimensional-materials-tungsten-disulfide-molybdenum-disulfide-and-black-phosphorous
#18
Huan Liu, Zhe Sun, Xi Wang, Yonggang Wang, Guanghua Cheng
Graphene-like two-dimensional (2D) materials have shown remarkable broadband saturable absorption properties. These materials were successfully applied into mode locked lasers to generate laser pulses with the pulse duration from picosecond to femtosecond. However, these novel materials have not shown good performance as far in another important aspect: Q-switched lasers. Solid-state or fiber lasers Q-switched with broadband absorbers usually generated pulses of one hundred nanosecond to several microsecond, which show weak competitiveness compared to traditional absorbers such as Cr: YAG and semiconductor saturable absorption mirror (SESAM)...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28362363/determining-the-chemical-composition-of-corrosion-inhibitor-metal-interfaces-with-xps-minimizing-post-immersion-oxidation
#19
Monika S Walczak, Perla Morales-Gil, Turia Belashehr, Kiran Kousar, Paulina Arellanes Lozada, Robert Lindsay
An approach for acquiring more reliable X-ray photoelectron spectroscopy data from corrosion inhibitor/metal interfaces is described. More specifically, the focus is on metallic substrates immersed in acidic solutions containing organic corrosion inhibitors, as these systems can be particularly sensitive to oxidation following removal from solution. To minimize the likelihood of such degradation, samples are removed from solution within a glove box purged with inert gas, either N2 or Ar. The glove box is directly attached to the load-lock of the ultra-high vacuum X-ray photoelectron spectroscopy instrument, avoiding any exposure to the ambient laboratory atmosphere, and thus reducing the possibility of post immersion substrate oxidation...
March 15, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28321903/spin-lock-imaging-of-exogenous-exchange-based-contrast-agents-to-assess-tissue-ph
#20
Zhongliang Zu, Hua Li, Xiaoyu Jiang, John C Gore
PURPOSE: Some X-ray contrast agents contain exchangeable protons that give rise to exchange-based effects on MRI, including chemical exchange saturation transfer (CEST). However, CEST has poor specificity to explicit exchange parameters. Spin-lock sequences at high field are also sensitive to chemical exchange. Here, we evaluate whether spin-locking techniques can detect the contrast agent iohexol in vivo after intravenous administration, and their potential for measuring changes in tissue pH...
March 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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