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https://www.readbyqxmd.com/read/27910450/first-order-reversal-curves-forc-analysis-of-individual-magnetic-nanostructures-using-micro-hall-magnetometry
#1
Merlin Pohlit, Paul Eibisch, Maryam Akbari, Fabrizio Porrati, Michael Huth, Jens Müller
Alongside the development of artificially created magnetic nanostructures, micro-Hall magnetometry has proven to be a versatile tool to obtain high-resolution hysteresis loop data and access dynamical properties. Here we explore the application of First Order Reversal Curves (FORC)-a technique well-established in the field of paleomagnetism for studying grain-size and interaction effects in magnetic rocks-to individual and dipolar-coupled arrays of magnetic nanostructures using micro-Hall sensors. A proof-of-principle experiment performed on a macroscopic piece of a floppy disk as a reference sample well known in the literature demonstrates that the FORC diagrams obtained by magnetic stray field measurements using home-built magnetometers are in good agreement with magnetization data obtained by a commercial vibrating sample magnetometer...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27906330/improved-sesams-for-femtosecond-pulse-generation-approaching-the-kw-average-power-regime
#2
C G E Alfieri, A Diebold, F Emaury, E Gini, C J Saraceno, U Keller
We present semiconductor saturable absorber mirrors (SESAMs) that can potentially support femtosecond pulses from ultrafast thin disk lasers (TDLs) with high average power approaching the kW-power level and high pulse energy in the range of 100 µJ to 1 mJ at megahertz pulse repetition rates. For high-power operation, the SESAM parameters will ultimately limit the shortest pulse duration from a soliton mode-locked laser before mode locking instabilities such as multiple pulsing instabilities and continuous wave (cw) breakthrough start to occur...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27900595/overexpression-of-a-thaumatin-like-protein-gene-from-vitis-amurensis-improves-downy-mildew-resistance-in-vitis-vinifera-grapevine
#3
Rongrong He, Jiao Wu, Yali Zhang, Cecilia B Agüero, Xinlong Li, Shaoli Liu, Chaoxia Wang, M Andrew Walker, Jiang Lu
Downy mildew is a highly destructive disease in grapevine production. A gene encoding pathogenesis-related (PR) thaumatin-like protein was isolated from the downy mildew-resistant grapevine "Zuoshan-1," a clonal selection from wild Vitis amurensis Rupr. The predicted thaumatin-like protein (VaTLP) has 225 amino acids and it is acidic, with a calculated isoelectric point of 4.8. The full length of the VaTLP gene was transformed into somatic embryogenic calli of V. vinifera 'Thompson Seedless' via Agrobacterium tumefaciens...
November 30, 2016: Protoplasma
https://www.readbyqxmd.com/read/27895478/biosynthesis-characterization-and-evaluation-of-bioactivities-of-leaf-extract-mediated-biocompatible-silver-nanoparticles-from-an-early-tracheophyte-pteris-tripartita-sw
#4
Xavierravi Baskaran, Antony Varuvel Geo Vigila, Thangaraj Parimelazhagan, Doulathabad Muralidhara-Rao, Shouzhou Zhang
The objective of the study was to characterize silver nanoparticles (Ag-NPs) and their bioactivities in early tracheophytes (Pteridophyta). Aqueous leaf extract of a critically endangered fern, Pteris tripartita Sw., was used for one-step green synthesis of Ag-NPs. The biosynthesized Ag-NPs were characterized using ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and high-resolution transmission electron microscopy...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27894963/longitudinal-surveillance-on-antibiogram-of-important-gram-positive-pathogens-in-southern-china-2001-to-2015
#5
Zhenbo Xu, Jinhong Xie, Brian M Peters, Bing Li, Lin Li, Guangchao Yu, Mark E Shirtliff
OBJECTIVES: A longitudinal surveillance aimed to investigate the antibiogram of three genus of important Gram-positive pathogens in Southern China during 2001-2015. METHODS: A total of 3849 Staphylococcus, Enterococcus and Streptococcus strains were isolated from Southern China during 2001-2015. Bacteria identification was performed by colony morphology, Gram staining, the API commercial kit and the Vitek 2 automated system. Antimicrobial susceptibility testing was determined by disk diffusion method and MIC method...
November 25, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27894388/-analysis-of-distribution-and-drug-resistance-of-pathogens-isolated-from-541-hospitalized-children-with-burn-infection
#6
J X Dai, L Li, L Xu, Z H Chen, X Y Li, M Liu, Y Q Wen, X D Chen
Objective: To investigate the distribution and drug resistance of pathogens isolated from hospitalized children with burn infection. Methods: Totally 541 patients were hospitalized in Fujian Medical University Union Hospital, the 180th Hospital of Chinese People's Liberation Army(PLA), the 92th Hospital of PLA, and Longyan First Hospital from January 2013 to December 2015. Totally 848 clinical specimens (blood, catheter tip attachments, wound exudate, etc.) were collected for pathogen detection. After being identified by an automatic microbiological identification system, drug resistance of pathogens to 41 commonly-used antibiotics in clinic including gentamicin, aztreonam, erythromycin, clindamycin, etc...
November 20, 2016: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/27887775/bactericidal-dental-nanocomposites-containing-1-2-3-triazolium-functionalized-poss-additive-prepared-through-thiol-ene-click-polymerization
#7
Saeed Beigi Burujeny, Hamid Yeganeh, Mohammad Atai, Hoshyar Gholami, Marzieh Sorayya
OBJECTIVE: Deterioration of mechanical strength for the dental composite containing ionic bactericidal compounds restricts the widespread utilization of this class of useful materials. This problem is originated from the reduction of the intermolecular interaction of polymeric network due to plasticization effect of absorbed water molecules penetrated between the chain segments. The main goal of this study is the synthesis of the highly efficient bactericidal additive with low hydrophilicity and consequently the least adverse effect on the final mechanical strength of the dental composite...
November 22, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27879511/c2-c3-anterior-cervical-fusion-technical-report
#8
Michael A Finn, Joel D MacDonald
STUDY DESIGN: Retrospective review of patients at a university hospital. OBJECTIVE: To describe the anterior approach for cervical discectomy and fusion (ACDF) at C2-C3 level and evaluate its suitability for treatment of instability and degenerative disease in this region. SUMMARY OF BACKGROUND DATA: The anterior approach is commonly used for ACDF in the lower cervical spine but is used less often in the high cervical spine. METHODS: We retrospectively reviewed a database of consecutive cervical spine surgeries performed at our institution to identify patients who underwent ACDF at the C2-C3 level during a 10-year period...
December 2016: Clinical Spine Surgery
https://www.readbyqxmd.com/read/27877859/self-lubricating-low-friction-wear-resistant-al-based-quasicrystalline-coatings
#9
Bruno Alessandro Silva Guedes de Lima, Rodinei Medeiros Gomes, Severino Jackson Guedes de Lima, Diana Dragoe, Marie-Geneviève Barthes-Labrousse, Richard Kouitat-Njiwa, Jean-Marie Dubois
After gas atomization, a quasicrystalline powder based on aluminium was used to prepare a thick coating by high-velocity oxygen-fuel flame torch spraying. This layer was deposited on top of a bond-coat layer on a steel plate. A post-spraying annealing treatment turned the two layers to their stable state, a γ-brass crystal and an icosahedral quasicrystal, respectively. The projection parameters were selected in such a way that the coating behaved like a self-lubricating material, which offered very good wear resistance (duration of pin-on-disk tests superior to 5 km with negligible material loss) and low friction (µ ≤ 6% against sintered tungsten carbide), in contrast to the state of the art...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27877017/study-of-the-antibacterial-and-antifungal-activities-of-synthetic-benzyl-bromides-ketones-and-corresponding-chalcone-derivatives
#10
Muhamad Ali K Shakhatreh, Mousa L Al-Smadi, Omar F Khabour, Fatima A Shuaibu, Emad I Hussein, Karem H Alzoubi
Several applications of chalcones and their derivatives encouraged researchers to increase their synthesis as an alternative for the treatment of pathogenic bacterial and fungal infections. In the present study, chalcone derivatives were synthesized through cross aldol condensation reaction between 4-(N,N-dimethylamino)benzaldehyde and multiarm aromatic ketones. The multiarm aromatic ketones were synthesized through nucleophilic substitution reaction between 4-hydroxy acetophenone and benzyl bromides. The benzyl bromides, multiarm aromatic ketones, and corresponding chalcone derivatives were evaluated for their activities against eleven clinical pathogenic Gram-positive, Gram-negative bacteria, and three pathogenic fungi by the disk diffusion method...
2016: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/27871241/prevalence-antimicrobial-susceptibility-patterns-and-associated-risk-factors-of-shigella-and-salmonella-among-food-handlers-in-arba-minch-university-south-ethiopia
#11
Mohammedaman Mama, Getaneh Alemu
BACKGROUND: The availability of safe food improves health of the people that contributes to productivity and provides an effective platform for development and poverty alleviation. On the other hand, unsafe food handling and processing can serve as a vehicle for the transmission of a variety of disease causing agents. The risk of food getting contaminated depends largely on the health status of the food handlers, their personal hygiene, knowledge and practice of food hygiene. Food borne diseases are therefore a public health problem in developed and developing countries which is also true for Ethiopia...
November 21, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27862503/accuracy-of-saline-contrast-sonohysterography-in-detection-of-endometrial-polyps-and-submucosal-leiomyoma-in-women-at-reproductive-age-with-abnormal-uterine-bleeding-a-systematic-review-and-meta-analysis
#12
REVIEW
Carolina Abdou Bittencourt, Ricardo Dos Santos Simões, Wanderley Marques Bernardo, Luiz Fernando Portugal Fuchs, José Maria Soares Junior, Ayrton Roberto Pastore, Edmund Chada Baracat
OBJECTIVE: To analyze the diagnostic accuracy of 2D and 3D saline contrast sonohysterography compared to hysteroscopy in the detection of endometrial polyps and submucosal myomas in women during reproductive age with abnormal uterine bleeding. METHOD: A systematic review of diagnostic studies that compared saline contrast sonohysterography with hysteroscopy was conducted according to the PRISMA and SEDATE recommendations. Only studies that compared two and/or three dimensional saline contrast sonohysterography with hysteroscopy and anatomopathology were included...
November 15, 2016: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27854348/oxidatively-locked-co%C3%A2-l%C3%A2-6-cylinders-derived-from-bis-bidentate-2-pyridyl-1-2-3-triazole-click-ligands-synthesis-stability-and-antimicrobial-studies
#13
Roan A S Vasdev, Dan Preston, Synøve Ø Scottwell, Heather J L Brooks, James D Crowley, Michael P Schramm
A small family of [Co₂(Lpytrz)₃](6+) cylinders was synthesised from bis(bidentate) 2-pyridyl-1,2,3-triazole "click" ligands (Lpytrz) through an "assembly-followed-by-oxidation" method. The cylinders were characterised using ¹H, (13)C, and DOSY NMR, IR, and UV-Vis spectroscopies, along with electrospray ionisation mass spectrometry (ESMS). Stability studies were conducted in dimethyl sulfoxide (DMSO) and D₂O. In contrast to similar, previously studied, [Fe₂(Lpytrz)₃](4+) helicates the more kinetically inert [Co₂(Lpytrz)₃](6+) systems proved stable (over a period of days) when exposed to DMSO and were even more stable in D₂O...
November 16, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27854229/increasing-role-of-titin-mutations-in-neuromuscular-disorders
#14
Marco Savarese, Jaakko Sarparanta, Anna Vihola, Bjarne Udd, Peter Hackman
The TTN gene with 363 coding exons encodes titin, a giant muscle protein spanning from the Z-disk to the M-band within the sarcomere. Mutations in the TTN gene have been associated with different genetic disorders, including hypertrophic and dilated cardiomyopathy and several skeletal muscle diseases.Before the introduction of next generation sequencing (NGS) methods, the molecular analysis of TTN has been laborious, expensive and not widely used, resulting in a limited number of mutations identified. Recent studies however, based on the use of NGS strategies, give evidence of an increasing number of rare and unique TTN variants...
August 30, 2016: Journal of Neuromuscular Diseases
https://www.readbyqxmd.com/read/27853664/return-to-play-after-cervical-spine-injuries-a-consensus-of-opinion
#15
John C France, Michael Karsy, James S Harrop, Andrew T Dailey
Study Design Survey. Objective Sports-related spinal cord injury (SCI) represents a growing proportion of total SCIs but lacks evidence or guidelines to guide clinical decision-making on return to play (RTP). Our objective is to offer the treating physician a consensus analysis of expert opinion regarding RTP that can be incorporated with the unique factors of a case for clinical decision-making. Methods Ten common clinical scenarios involving neurapraxia and stenosis, atlantoaxial injury, subaxial injury, and general cervical spine injury were presented to 25 spine surgeons from level 1 trauma centers for whom spine trauma is a significant component of their practice...
December 2016: Global Spine Journal
https://www.readbyqxmd.com/read/27851881/magnetic-resonance-safety-and-compatibility-of-tantalum-markers-used-in-proton-beam-therapy-for-intraocular-tumors-a-7-0-tesla-study
#16
Eva Oberacker, Katharina Paul, Till Huelnhagen, Celal Oezerdem, Lukas Winter, Andreas Pohlmann, Laura Boehmert, Oliver Stachs, Jens Heufelder, Andreas Weber, Matus Rehak, Ira Seibel, Thoralf Niendorf
PURPOSE: Proton radiation therapy (PRT) is a standard treatment of uveal melanoma. PRT patients undergo implantation of ocular tantalum markers (OTMs) for treatment planning. Ultra-high-field MRI is a promising technique for 3D tumor visualization and PRT planning. This work examines MR safety and compatibility of OTMs at 7.0 Tesla. METHODS: MR safety assessment included deflection angle measurements (DAMs), electromagnetic field (EMF) simulations for specific absorption rate (SAR) estimation, and temperature simulations for examining radiofrequency heating using a bow-tie dipole antenna for transmission...
November 10, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27846254/extended-spectrum-beta-%C3%AE-lactamases-and-antibiogram-in-enterobacteriaceae-from-clinical-and-drinking-water-sources-from-bahir-dar-city-ethiopia
#17
Bayeh Abera, Mulugeta Kibret, Wondemagegn Mulu
BACKGROUND: The spread of Extended-Spectrum beta (β)-Lactamases (ESBL)-producing Enterobacteriaceae has become a serious global problem. ESBL-producing Enterobacteriaceae vary based on differences in antibiotic use, nature of patients and hospital settings. This study was aimed at determining ESBL and antibiogram in Enterobacteriaceae isolates from clinical and drinking water sources in Bahir Dar City, Northwest Ethiopia. METHODS: Enterobacteriaceae species were isolated from clinical materials and tap water using standard culturing procedures from September 2013 to March 2015...
2016: PloS One
https://www.readbyqxmd.com/read/27830081/inhibitory-effect-of-lactobacillus-plantarum-and-lb-fermentum-isolated-from-the-faeces-of-healthy-infants-against-nonfermentative-bacteria-causing-nosocomial-infections
#18
M M Soltan Dallal, A Davoodabadi, M Abdi, M Hajiabdolbaghi, M K Sharifi Yazdi, M Douraghi, S M Tabatabaei Bafghi
Nosocomial infection constitutes a major public health problem worldwide. Increasing antibiotic resistance of pathogens associated with nosocomial infections has also become a major therapeutic challenge for physicians. Thus, development of alternative treatment protocols, such as the use of probiotics, matters. The aim of this research was to determine the antagonistic properties of Lactobacillus plantarum and Lb. fermentum isolated from the faeces of healthy infants against nonfermentative bacteria causing nosocomial infections...
January 2017: New Microbes and New Infections
https://www.readbyqxmd.com/read/27828444/on-the-phase-noise-performance-of-microwave-and-millimeter-wave-signals-generated-with-versatile-kerr-optical-frequency-combs
#19
Khaldoun Saleh, Yanne K Chembo
We investigate the phase noise performance of micro- and millimeter-wave signals generated using a ultra-high Q whispering gallery mode disk-resonator with Kerr nonlinearity. Our study focuses on the stability of the optical spectra and on the performances of the corresponding microwave and millimeter-wave beat notes in terms of power and phase noise. The blue slope of an optical mode of the resonator, allowing for the generation of optical frequency combs, is accurately explored in order to identify various comb patterns...
October 31, 2016: Optics Express
https://www.readbyqxmd.com/read/27828179/high-efficiency-high-average-power-cw-yb-yag-zigzag-slab-master-oscillator-power-amplifier-at-room-temperature
#20
Xiaoming Chen, Liu Xu, Hao Hu, Tangjian Zhou, Yinhong Sun, Hao Jiang, Jun Lei, Wenqiang Lv, Hua Su, Yong Shi, Mi Li, Yingchen Wu, Zhenyu Yao, Na Zhao, Xiaoxiao Xu, Qingsong Gao, Xiaojun Wang, Chun Tang
We demonstrate a high-efficiency, high-average-power, CW master oscillator power amplifier based on a conduction-cooled, end-pumped Yb:YAG slab architecture at room temperature (RT). Firstly, the CW amplification property is theoretically analyzed based on the kinetics model for Yb:YAG. To realize high-efficiency laser amplification extraction for RT Yb:YAG, not only intense pump but also a high-power seed laser is of great importance. Experimentally, a composite Yb:YAG crystal slab with three doped and two un-doped segments symmetrically is employed as the gain medium, which is end-pumped by two high-power, 940-nm diode lasers...
October 17, 2016: Optics Express
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