Read by QxMD icon Read


Jiali Gu, Hongfei Tong, Laiyu Sun, Zhijian Lin
Mandelate racemase from Pseudomonas putida is a promising candidate for the dynamic kinetic resolution of α-hydroxy carboxylic acids. In the present study, the thermal stability of mandelate racemase was investigated through molecular dynamics simulations in the temperature range of 303 K to 363 K, which can guide the design of mandelate racemase with higher stability. The basic features such as radius of gyration, surface accessibility, and secondary structure content suggested the instability of mandelate racemase at high temperatures...
January 15, 2018: Journal of Biomolecular Structure & Dynamics
James S Hyde, Richard R Mett
The dielectric tube resonator (DTR) for EPR spectroscopy is introduced. It is defined as a metallic cylindrical TE011 microwave cavity that contains a dielectric tube centered on the axis of the cylinder. Contour plots of dimensions of the metallic cylinder to achieve resonance at 9.5 GHz are shown for quartz, sapphire, and rutile tubes as a function of wall thickness and average radius. These contour plots were developed using analytical equations and confirmed by finite element modeling. They can be used in two ways: design of the metallic cylinder for use at 9...
December 2017: Applied Magnetic Resonance
Oupa E Malahlela, Jane M Olwoch, Clement Adjorlolo
Malaria in South Africa is still a problem despite existing efforts to eradicate the disease. In the Vhembe District Municipality, malaria prevalence is still high, with a mean incidence rate of 328.2 per 100,0000 persons/year. This study aimed at evaluating environmental covariates, such as vegetation moisture and vegetation greenness, associated with malaria vector distribution for better predictability towards rapid and efficient disease management and control. The 2005 malaria incidence data combined with Landsat 5 ETM were used in this study...
January 12, 2018: EcoHealth
Sanaullah Khan, Johnny Birch, Marie-Rose Van Calsteren, Richard Ipsen, Günther H J Peters, Birte Svensson, Pernille Harris, Kristoffer Almdal
Despite a very large number of bacterial exopolysaccharides have been reported, detailed knowledge on their molecular structures and associative interactions with proteins is lacking. Small-angle X-ray scattering, dynamic light scattering and analytical ultracentrifugation (AUC) were used to characterize the interactions of six lactic acid bacterial heteroexopolysaccharides (HePS-1-HePS-6) with β-lactoglobulin (BLG). Compared to free HePSs, a large increase in the X-ray radius of gyration RG, maximum length L and hydrodynamic diameter dH of HePS-1-HePS-4 mixed with BLG revealed strong aggregation, the extent of which depended on the compact conformation and degree of branching of these HePSs...
January 9, 2018: International Journal of Biological Macromolecules
X Zheng, Y R Sun, J-J Chen, W Jiang, K Pachucki, S-M Hu
The 2 ^{3}S-2 ^{3}P transition of ^{4}He was measured by comb-linked laser spectroscopy using a transverse-cooled atomic beam. The centroid frequency was determined to be 276 736 495 600.0(1.4) kHz, with a fractional uncertainty of 5.1×10^{-12}. This value is not only more accurate but also differs by as much as -49.5  kHz (20σ) from the previous result given by [Cancio Pastor et al., Phys. Rev. Lett. 92, 023001 (2004)PRLTAO0031-900710.1103/PhysRevLett.92.023001; Cancio Pastor et al.Phys. Rev...
December 29, 2017: Physical Review Letters
So Jung Park, Seyong Kim, Daeseong Yong, Youngson Choe, Joona Bang, Jaeup U Kim
We systematically examined the polymer-mediated interparticle interactions between polymer-grafted nanoparticles (NPs) within chemically identical homopolymer matrices through experimental and computational efforts. In experiments, we prepared thermally stable gold NPs grafted with polystyrene (PS) or poly(methyl methacrylate) (PMMA), and they were mixed with corresponding homopolymers. The nanocomposites are well dispersed when the molecular weight ratio of free to grafted polymers, α, is small. For α above 10, NPs are partially aggregated or clumped within the polymer matrix...
January 12, 2018: Soft Matter
Victor V Kotlyar, Alexey A Kovalev, Alexey P Porfirev
We show that an elliptic Gaussian beam, focused by a cylindrical lens, can be represented as a linear combination of a countable number of only even angular harmonics with both positive and negative topological charge. For the orbital angular momentum (OAM) of the astigmatic Gaussian beam, an exact expression is obtained in a form of a converging series of the Legendre functions of the second kind. It is shown that at some conditions only the terms with the positive or negative topological charge are remained in this series...
January 8, 2018: Optics Express
Kayori Takahashi, Seika Ohuchi, Keizo Saito, Makoto Hirasawa, Hiromu Sakurai
The preparation of nanoscale fine bubbles in water is an innovative technology, but no precise method for simultaneously measuring the size and concentration of such bubbles had previously been developed. We have developed a method for simultaneously determining the size and concentration of fine bubbles in water by a light-scattering technique. Dynamic light scattering gives the diffusion constant and particle size of fine bubbles, whereas static light scattering provides their concentration or molar mass...
January 10, 2018: Applied Optics
Marta Mikuła, Tomasz Kozacki, Michał Józwik, Julianna Kostencka
This paper proposes a measurement method of focusing objects with a high gradient shape of a small and large radius of curvature. The measurements are carried out on a Fourier digital holographic microscope with optimized illumination conditions maximizing the usage of the system's numerical aperture. The obtained fringe patterns are the result of interference of deformed spherical object and spherical reference waves. The key elements of the method are the aberration compensation and calibration procedures...
January 1, 2018: Applied Optics
Yansheng Liang, Ming Lei, Shaohui Yan, Manman Li, Yanan Cai, Zhaojun Wang, Xianghua Yu, Baoli Yao
Low-refractive-index microparticles, such as hollow microspheres, have shown great significance in some applications, such as biomedical sensing and targeted drug delivery. However, optical trapping and manipulation of low-refractive-index microparticles are challenging, owing to the repelling force exerted by typical optical traps. In this paper, we demonstrated optical trapping and rotating of large-sized low-refractive-index microparticles by using quasi-perfect optical vortex (quasi-POV) beams, which were generated by Fourier transform of high-order quasi-Bessel beams...
January 1, 2018: Applied Optics
Ozan Burak Ericok, Ali Taylan Cemgil, Hakan Erturk
Characterization of nanoparticle aggregates from observed scattered light leads to a highly complex inverse problem. Even the forward model is so complex that it prohibits the use of classical likelihood-based inference methods. In this study, we compare four so-called likelihood-free methods based on approximate Bayesian computation (ABC) that requires only numeric simulation of the forward model without the need of evaluating a likelihood. In particular, rejection, Markov chain Monte Carlo, population Monte Carlo, and adaptive population Monte Carlo (APMC) are compared in terms of accuracy...
January 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Jun Wang, Qiong-Hua Wang, Yuhen Hu
A unified and accurate fast diffraction calculation between a pair of concentric cylindrical surfaces is proposed. Analysis of the obliquity factor shows that the physical meaning of it is the projection of the unit complex amplitude in the propagation direction onto the outer normal of the observation point. Therefore, a unified and accurate diffraction calculation formula for both inside-out and outside-in propagation models is achieved. Furthermore, it is accurately accelerated by a fast calculation method using fast Fourier transformation with a speed-up over 3...
January 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Ming-Liang Li, Jian-Shui Mao, Chong-Bin Zhou, Ji-Wei Wang, Zhi-Jun Ye
OBJECTIVE: To summarize experiences of operative treatment for Essex-Lopresti injury, and analyze the effect of the compare repair of interosseous membrane of forearm(IOM)on the forearm function. METHODS: Twenty-four patients of Essex-Lopresti injury were treated from January 2005 to December 2013, 16 patients(group A) with radius and/or ulna fractures were treated with open reduction and internal fixation of radius or ulna and repair of forearm bone membrane at the same time, and then treated with open reduction and internal fixation of head of radius, as well as lower ulnar joint fixation or repair of wrist triangle fiber complex...
January 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Yong Zhao, Qing-Qing Dong, Wei-Kai Qin, An Yan, Kuan Zhang, Guo-Dong Zhao, Gang Wang, Jin-Chao Geng, Zhan-Feng Wang, Ze-Ming Lu
OBJECTIVE: To evaluate efficacy and advantages of the Traditional Chinese Medicine (TCM) synthetic rehabilitation therapy in the treatment of wrist dysfunction after distal radius fractures. METHODS: From May 2014 to October 2015, 72 patients with distal radius fracture meeting standards were treated using central randomization system for clinical research. All the patients were divided into two groups: 36 patients in test group and 36 in control group. Sixty-nine cases were finished treatment and followed up in the end...
January 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
M N Baig, C Egan
Introduction Paediatric patient bone fractures are the source of a large number of orthopaedic outpatient visits, especially for fracture clinics. The National Institute for Health and Care Excellence (NICE) guideline NG38 provides guidance on assessing and managing non-complex fractures, such as buckle (i.e., torus) fractures in paediatric patients. Objective We retrospectively audited outpatient records of children younger than 12 years presenting with distal radius buckle fractures for May and June 2017...
November 8, 2017: Curēus
D Hadizie, I Munajat
Introduction: Both-bone forearm fractures in children can be treated non-operatively with a cast. Most previous studies have shown favourable outcome; however, information on the functional outcome after skeletal maturity is still scanty. Therefore, this study was conducted to determine the functional outcome after skeletal maturity in fractures with at least four years of growth remaining. Materials and Methods: This retrospective study was conducted from March 2012 until March 2013. Age at the time of fracture was taken as until 10 years for females and until 12 years old for males with at least four years of growth remaining...
November 2017: Malaysian Orthopaedic Journal
Catherine E O'Brien, Gulnur Com, John Fowlkes, Xinyu Tang, Laura P James
INTRODUCTION: In 2015, 11.9% of people with cystic fibrosis (CF) in the United States had osteopenia, 5.1% osteoporosis, and 0.3% experienced a fracture. Screening for CF-related bone disease starts in childhood, and dual energy x-ray absorptiometry (DXA) is the recommended method. It is unknown whether peripheral quantitative computed tomography (pQCT) can detect deficits earlier than DXA. This study compared pQCT and DXA scans in a group of pre-pubertal children with CF and healthy controls...
2018: PloS One
Taylor J Jackson, Todd J Blumberg, Apurva S Shah, Wudbhav N Sankar
BACKGROUND: Musculoskeletal injuries are among the most common reasons for emergency department (ED) visits in the pediatric population. Many such injuries can be managed with a single follow-up outpatient visit. However, untimely (ie, premature) referrals by emergency physicians to orthopaedic surgeons are common and may inadvertently create need for a second visit, generating unnecessary expenditures. We sought to elucidate the cost of premature musculoskeletal follow-up visits to the patients, families, and the health care system...
January 10, 2018: Journal of Pediatric Orthopedics
P S Savchenkov, P A Alekseev, A Podlesnyak, A I Kolesnikov, K S Nemkovski
Magnetic neutron scattering data for Sm (SmB6, Sm(Y)S) and Eu (EuCu2Si2-x Ge x ) intermediate-valence compounds have been analysed in terms of a generalized model of the intermediate-radius exciton. Special attention is paid to the correlation between the average ion's valence and parameters of the low-energy excitation in the neutron spectra, such as the resonance mode, including its magnetic form factor. Along with specific features of the formation of the intermediate-valence state for Sm and Eu ions, common physical mechanisms have been revealed for systems based on these elements from the middle of the rare-earth series...
January 11, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Tong Li, Jian-Guo Zhang
Metal hydrazineboranes (MHBs), as a kind of new hydrogen storage materials, show the excellent hydrogen storage per-formance and the dehydrogenation property. Herein, we designed multiple dehydrogenation pathways to compare with each other and indicated the metal-controlled effect. Quantum chemistry theory is used to calculate the crystal structure for determining the molecular structure. With the increasing of the metal radius, the energy difference of the isomers also increases. The dehydrogenation pathways of Lithium hydrazineborane (PathA) and Sodium hydrazineborane (PathB) show the totally similar to each other in the dehydrogenation process despite the energy barrier, as well as the comparison Path of A' (for LiHB) and B' (for NaHB)...
January 11, 2018: Journal of Physical Chemistry. A
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"