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https://www.readbyqxmd.com/read/28749533/charmm-force-field-and-molecular-dynamics-simulations-of-protonated-polyethylenimine
#1
Titus Adrian Beu, Alexandra Farcaş
As a gene delivery vector, polyethylenimine (PEI) shows one of the highest transfection efficiencies, while effectively protecting DNA from enzyme degradation. The distinctive charge pattern of protonated PEI is widely considered responsible for fundamental process such as DNA condensation into PEI/DNA polyplexes (which are able to enter cells via endocytosis), proton sponge effect (which triggers the release of polyplexes from endosome), and release of DNA from polyplexes (to be further processed inside the nucleus)...
July 27, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28749379/theoretical-limits-to-sensitivity-and-resolution-in-magneto-acousto-electrical-tomography
#2
Elyar Ghalichi, Nevzat Guneri Gencer
In this study, the performance of Magneto-Acousto Electrical Tomography (MAET) method is investigated quantitatively by considering interrelations between its sensitivity, resolution and conductivity contrast. An analytical solution for the forward problem of MAET is derived for two-dimensional (2D) concentric bodies by Separation of Variables Method. The electric potential and the acoustic pressure are separated to their angular and radial components. The series coefficients for these solutions are obtained by their respective boundary conditions...
July 27, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28747045/molecular-dynamics-modeling-and-simulation-of-diamond-cutting-of-cerium
#3
Junjie Zhang, Haibing Zheng, Maobing Shuai, Yao Li, Yang Yang, Tao Sun
The coupling between structural phase transformations and dislocations induces challenges in understanding the deformation behavior of metallic cerium at the nanoscale. In the present work, we elucidate the underlying mechanism of cerium under ultra-precision diamond cutting by means of molecular dynamics modeling and simulations. The molecular dynamics model of diamond cutting of cerium is established by assigning empirical potentials to describe atomic interactions and evaluating properties of two face-centered cubic cerium phases...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28746390/homogenized-modeling-methodology-for-18650-lithium-ion-battery-module-under-large-deformation
#4
Liang Tang, Jinjie Zhang, Pengle Cheng
Effective lithium-ion battery module modeling has become a bottleneck for full-size electric vehicle crash safety numerical simulation. Modeling every single cell in detail would be costly. However, computational accuracy could be lost if the module is modeled by using a simple bulk material or rigid body. To solve this critical engineering problem, a general method to establish a computational homogenized model for the cylindrical battery module is proposed. A single battery cell model is developed and validated through radial compression and bending experiments...
2017: PloS One
https://www.readbyqxmd.com/read/28745642/assessing-spatial-memory-impairment-in-a-mouse-model-of-traumatic-brain-injury-using-a-radial-water-tread-maze
#5
Marcella M Cline, Megan A Ostlie, Chloe G Cross, Gregory G Garwin, Satoshi Minoshima, Donna J Cross
Despite the recent increase in use of mouse models in scientific research, researchers continue to use cognitive tasks that were originally designed and validated for rat use. The Radial Water Tread (RWT) maze test of spatial memory (designed specifically for mice and requiring no swimming) has been shown previously to successfully distinguish between controlled cortical impact-induced TBI mice and sham controls. Here, a detailed protocol for this task is presented. The RWT maze capitalizes on the natural tendency of mice to avoid open areas in favor of hugging the sides of an apparatus (thigmotaxis)...
July 17, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28745437/vascularized-ulnar-periosteal-pedicled-flap-for-forearm-reconstruction-anatomical-study-and-a-case-report
#6
Barrera-Ochoa Sergi, Velez Roberto, Rodriguez-Baeza Alfonso, De Bergua-Domingo Josep Maria, Knörr Jorge, Soldado Francisco
PURPOSE: Through an anatomical review, the aim of this study is to define the ulnar periosteal branches of the posterior interosseous vessels (PIV). In addition, we report the clinical utility of a vascularized ulnar periosteal pedicled flap (VUPPF), supplied by the investigated PIV, in a complex case of radial nonunion. METHODS: Ten upper limbs latex colored from fresh human cadavers were used. Branches of the PIV were dissected under 2.5× loupe magnification, noting the periosteal, muscular, and cutaneous branches arising distal to the interosseous recurrent artery...
July 26, 2017: Microsurgery
https://www.readbyqxmd.com/read/28745292/biomimetic-synthesis-of-agnps-from-penicillium-chrysogenum-strain-fgcc-bls1-by-optimising-physico-cultural-conditions-and-assessment-of-their-antimicrobial-potential
#7
Juhi Saxena, Pankaj Sharma, Abhijeet Singh
Biomimetic synthesis of metal nanoparticles (NPs) is safe and eco-friendly; therefore, find diverse applications. Considering this, the soil fungi Penicillium chrysogenum strain Fungal germplasm collection centre/ BLS1 was isolated, characterized and explored to synthesize extracellular silver NPs (AgNPs) under optimised conditions. The synthesis of AgNPs was investigated using ultraviolet (UV)-visible spectroscopy, Fourier-transform infra-red spectroscopy (FTIR), transmission electron microscope (TEM) and dynamic light scattering (DLS) analysis...
August 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28745016/associations-between-self-reported-sleep-quality-and-white-matter-in-community-dwelling-older-adults-a-prospective-cohort-study
#8
Claire E Sexton, Enikő Zsoldos, Nicola Filippini, Ludovica Griffanti, Anderson Winkler, Abda Mahmood, Charlotte L Allan, Anya Topiwala, Simon D Kyle, Kai Spiegelhalder, Archana Singh-Manoux, Mika Kivimaki, Clare E Mackay, Heidi Johansen-Berg, Klaus P Ebmeier
Both sleep disturbances and decline in white matter microstructure are commonly observed in ageing populations, as well as in age-related psychiatric and neurological illnesses. A relationship between sleep and white matter microstructure may underlie such relationships, but few imaging studies have directly examined this hypothesis. In a study of 448 community-dwelling members of the Whitehall II Imaging Sub-Study aged between 60 and 82 years (90 female, mean age 69.2 ± 5.1 years), we used the magnetic resonance imaging technique diffusion tensor imaging to examine the relationship between self-reported sleep quality and white matter microstructure...
July 26, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28744730/relationships-between-the-integrity-and-function-of-lumbar-nerve-roots-as-assessed-by-diffusion-tensor-imaging-and-neurophysiology
#9
S Y Chiou, P J Hellyer, D J Sharp, R D Newbould, M C Patel, P H Strutton
PURPOSE: Diffusion tensor imaging (DTI) has shown promise in the measurement of peripheral nerve integrity, although the optimal way to apply the technique for the study of lumbar spinal nerves is unclear. The aims of this study are to use an improved DTI acquisition to investigate lumbar nerve root integrity and correlate this with functional measures using neurophysiology. METHODS: Twenty healthy volunteers underwent 3 T DTI of the L5/S1 area. Regions of interest were applied to L5 and S1 nerve roots, and DTI metrics (fractional anisotropy, mean, axial and radial diffusivity) were derived...
July 25, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28744668/single-port-thoracoscopic-lung-wedge-resection-using-the-endo-gia-radial-reload
#10
Atsushi Sano, Takuma Yotsumoto
The GIA Radial Reload is a surgical stapler with a curved cut line that is perpendicular to the direction of instrument insertion. We used the GIA Radial Reload in three cases of single-port thoracoscopic lung wedge resection. The operations were performed through a 3.0-4.5-cm incision. For the first stapler, we selected the GIA Radial Reload. The orientation of this device's cut line enabled us to easily cut the lung behind the lesion during single-port thoracoscopic surgery.
July 25, 2017: Surgery Today
https://www.readbyqxmd.com/read/28743756/on-the-question-of-fractal-packing-structure-in-metallic-glasses
#11
Jun Ding, Mark Asta, Robert O Ritchie
This work addresses the long-standing debate over fractal models of packing structure in metallic glasses (MGs). Through detailed fractal and percolation analyses of MG structures, derived from simulations spanning a range of compositions and quenching rates, we conclude that there is no fractal atomic-level structure associated with the packing of all atoms or solute-centered clusters. The results are in contradiction with conclusions derived from previous studies based on analyses of shifts in radial distribution function and structure factor peaks associated with volume changes induced by pressure and compositional variations...
July 25, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28743330/sludge-reduction-in-the-activated-sludge-process-strengthened-by-enhanced-ozonation-oxidation
#12
Yingwen Chen, Wei Zhang, Yangyang Feng, Qiong Huang, Shubao Shen
  A novel radial-axial mixer and microbubble ozone reactor for enhancing sludge disintegration was designed. In the batch studies, the new reactor was shown to be significantly effective in improving sludge disintegration and increasing ozone utilization. For ozone dosages of 0.02 to 0.3 gO3/gTSS (total suspended solids) at pH = 10, the average sludge disintegration ratio was more than 17 ± 0.83% higher than that of the conventional reactor. An activated sludge process coupled with discharged sludge ozonated was run for 60 days to evaluate the influence of ozonated sludge feeding on the sludge yield coefficient and effluent quality...
August 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28742927/a-new-model-for-netrin1-in-commissural-axon-guidance
#13
REVIEW
Daniel Morales
Now-classic experiments characterized netrin1 as a major player in commissural axon guidance in the spinal cord. The data suggest a chemotactic model in which netrin1 expression in the floor plate forms a concentration gradient that attracts commissural axons. New research published independently in Neuron and in Nature tests this model by deleting netrin1 specifically in the floor plate. Surprisingly, these conditional mutant mice have no overt commissure defects. The authors report that netrin1 decorates the pial surface of the spinal cord and hindbrain, likely deposited by radial processes of progenitor cells in the ventricular zone...
July 25, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28742788/computer-assisted-corrective-osteotomy-of-malunited-pediatric-radial-neck-fractures-three-dimensional-postoperative-accuracy-and-clinical-outcome
#14
Lizzy Weigelt, Philipp Fürnstahl, Andreas Schweizer
Neglected or incorrect treatment of pediatric radial neck fractures may lead to symptomatic malunions. Computer-assisted corrective osteotomies with patient-specific guides have been proposed as a promising technique for the reconstruction of malunited long bone deformities. The aim of this study was to evaluate the accuracy and clinical outcome of this technique in children with malunited fractures of the radial neck. Four children (two male, two female; mean age 12 (10-16) years) underwent computer-assisted closing wedge osteotomy of the radial neck...
July 24, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28742134/hemostasis-pad-combined-with-compression-device-after-transradial-coronary-procedures-a-randomized-controlled-trial
#15
Si-Hyuck Kang, Donghoon Han, Sehun Kim, Chang-Hwan Yoon, Jin-Joo Park, Jung-Won Suh, Young-Seok Cho, Tae-Jin Youn, In-Ho Chae
BACKGROUND: Arterial access and hemostasis are important processes during percutaneous coronary procedures. In this study, we tested if the use of chitosan-based pads on top of compression devices could improve hemostasis efficacy compared with compression devices alone after transradial coronary angiography or interventions. METHODS: This study was a single-center open-label randomized controlled trial. Patients who underwent coronary angiography or intervention with the transradial approach were randomly assigned to the study (compression device and a chitosan-based pad) or control (compression devices alone) group in a 2:1 fashion...
2017: PloS One
https://www.readbyqxmd.com/read/28741977/reduction-in-the-presence-of-cryoglobulins-over-time-in-the-hemodialysis-treatment
#16
Tainá Mosca, Simone Sanches Arcuri, Luiz Antônio Miorin, Andrelita de Oliveira Cristiano, Yvoty Alves Dos Santos Sens, Wilma Carvalho Neves Forte
BACKGROUND: The presence of cryoglobulins in patients with chronic kidney disease (CKD) on hemodialysis is well described. However, the generation of cryoglobulins during the dialysis treatment has yet to be established. The aim of the present study was to determine the presence of serum cryoglobulins over time in the dialysis treatment in patients with CKD not infected with hepatitis C virus (HCV). METHOD: Peripheral blood samples were collected at the beginning of dialysis treatment and at 30, 60, 90 and 120 days afterwards...
November 2017: Renal Failure
https://www.readbyqxmd.com/read/28741711/diffusion-tensor-imaging-in-multiple-sclerosis-at-different-final-outcomes
#17
O Andersen, A Hildeman, M Longfils, H Tedeholm, B Skoog, W Tian, J Zhong, S Ekholm, L Novakova, B Runmarker, O Nerman, S E Maier
OBJECTIVES: Methods to evaluate the relative contributions of demyelination vs axonal degeneration over the long-term course of MS are urgently needed. We used magnetic resonance diffusion tensor imaging (DTI) to estimate degrees of demyelination and axonal degeneration in the corpus callosum (CC) in cases of MS with different final outcomes. MATERIALS AND METHODS: We determined DTI measures mean diffusivity (MD), fractional anisotropy (FA), and axial (AD) and radial (RD) diffusivities in the CC of 31 MS patients, of whom 13 presented a secondary progressive course, 11 a non-progressive course, and seven a monophasic course...
July 25, 2017: Acta Neurologica Scandinavica
https://www.readbyqxmd.com/read/28741214/market-segmentation-and-industry-overcapacity-considering-input-resources-and-environmental-costs-through-the-lens-of-governmental-intervention
#18
Zhou Jiang, Peizhen Jin, Nishikant Mishra, Malin Song
The problems with China's regional industrial overcapacity are often influenced by local governments. This study constructs a framework that includes the resource and environmental costs to analyze overcapacity using the non-radial direction distance function and the price method to measure industrial capacity utilization and market segmentation in 29 provinces in China from 2002 to 2014. The empirical analysis of the spatial panel econometric model shows that (1) the industrial capacity utilization in China's provinces has a ladder-type distribution with a gradual decrease from east to west and there is a severe overcapacity in the traditional heavy industry areas; (2) local government intervention has serious negative effects on regional industry utilization and factor market segmentation more significantly inhibits the utilization rate of regional industry than commodity market segmentation; (3) economic openness improves the utilization rate of industrial capacity while the internet penetration rate and regional environmental management investment have no significant impact; and(4) a higher degree of openness and active private economic development have a positive spatial spillover effect, while there is a significant negative spatial spillover effect from local government intervention and industrial structure sophistication...
July 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28741084/towards-the-prediction-of-flow-induced-shear-stress-distributions-experienced-by-breast-cancer-cells-in-the-lymphatics
#19
S T Morley, D T Newport, M T Walsh
Tumour metastasis in the lymphatics is a crucial step in the progression of breast cancer. The dynamics by which breast cancer cells (BCCs) travel in the lymphatics remains poorly understood. The goal of this work is to develop a model capable of predicting the shear stresses metastasising BCCs experience using numerical and experimental techniques. This paper models the fluidic transport of large particles ([Formula: see text] where [Formula: see text] is the particle diameter and W is the channel width) subjected to lymphatic flow conditions ([Formula: see text]), in a [Formula: see text] microchannel...
July 24, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28740768/fmri-after-phalloplasty-with-nerve-anastomosis-in-a-trans-man-patient
#20
Roberto Doria-Medina, Åsa Carlsson, Emma H Jönsson, Lars Jönsson, Andri Thorarinsson, Mattias Lidén, Gennaro Selvaggi
We report on a case of a trans-man patient, who underwent penile reconstruction with the use of a radial forearm flap, urethroplasty, vaginectomy and scrotoplasty, insertion of testicle implants, and penile erection implants, similar to previously described methods. One of the requirements for an ideal phalloplasty is the preservation of erogenous sensitivity, which is often demanded by the patients for fulfilling their sexual well-being. For the first time known to us, we use a functional magnetic resonance imaging following radial forearm flap phalloplasty with nerve anastomosis to assess the cortical activation after clitoral stimulation...
June 2017: Plastic and Reconstructive Surgery. Global Open
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