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https://www.readbyqxmd.com/read/29162869/novel-one-step-synthesis-of-zwitterionic-polymer-nanoparticles-via-distillation-precipitation-polymerization-and-its-application-for-dye-removal-membrane
#1
G P Syed Ibrahim, Arun M Isloor, Inamuddin, Abdullah M Asiri, Norafiqah Ismail, Ahmed Fauzi Ismail, Ghulam Md Ashraf
In this work, poly(MBAAm-co-SBMA) zwitterionic polymer nanoparticles were synthesized in one-step via distillation-precipitation polymerization (DPP) and were characterized. [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (SBMA) as monomer and N, N'-methylene bis(acrylamide) (MBAAm) as cross-linker are used for the synthesis of nanoparticles. As  far as our knowledge, this is the first such report on the synthesis of poly(MBAAm-co-SBMA) nanoparticles via DPP. The newly synthesized nanoparticles were further employed for the surface modification of polysulfone (PSF) hollow fiber membranes for dye removal...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29159941/the-role-of-off-focus-radiation-in-scatter-correction-for-dedicated-cone-beam-breast-ct
#2
Linxi Shi, Srinivasan Vedantham, Andrew Karellas, Lei Zhu
PURPOSE: Dedicated cone beam breast CT (CBBCT) suffers from x-ray scatter contamination. We aim to identify the source of the significant difference between the scatter distributions estimated by two recent methods proposed by our group and to investigate its effect on CBBCT image quality. METHOD: We recently proposed two novel methods of scatter correction for CBBCT, using a library based (LB) technique and a forward projection (FP) model. Despite similar enhancement on CBBCT image qualities, these two methods obtain very different scatter distributions...
November 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/29154310/tutorial-on-x-ray-photon-counting-detector-characterization
#3
Liqiang Ren, Bin Zheng, Hong Liu
BACKGROUND: Recent advances in photon counting detection technology have led to significant research interest in X-ray imaging. OBJECTIVE: As a tutorial level review, this paper covers a wide range of aspects related to X-ray photon counting detector characterization. METHODS: The tutorial begins with a detailed description of the working principle and operating modes of a pixelated X-ray photon counting detector with basic architecture and detection mechanism...
November 16, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/29153469/postoperative-urinary-retention-or-difficulties-to-empty-the-bladder-in-young-patients-undergoing-posterior-spinal-fusion-for-adolescent-idiopathic-scoliosis
#4
Heli Keskinen, Linda Helenius, Olli Pajulo, Ilkka J Helenius
BACKGROUND: Postoperative urinary retention has been reported to affect up to 27% of adults undergoing degenerative lumbar spine surgery and approximately one-third of children undergoing lower-extremity orthopedic surgery. No data exist on the incidence and risk factors of postoperative urinary tract retention/difficulties to empty the bladder in young patients undergoing instrumented posterior spinal fusion. We aimed to characterize incidence, risk factors and treatment of postoperative urinary retention (POUR) and difficulties to empty the bladder in young patients undergoing posterior spinal fusion (PSF) for idiopathic scoliosis...
October 13, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/29151348/polysulfone-sio2-hybrid-shell-microcapsules-synthesized-by-the-combination-of-pickering-emulsification-and-solvent-evaporation-technique-and-their-application-in-self-lubricating-composites
#5
Haiyan Li, Shuang Li, Zhike Li, Yanji Zhu, Huaiyuan Wang
Lubricant oil-filled polysulfone/SiO2 (PSF/SiO2) hybrid shell microcapsules are prepared by the combination of Pickering emulsification and the solvent evaporation technique. Silica particles are used as stabilizers. The structure and properties of the microcapsules are influenced by the silica particle concentration, agitation speed, and encapsulation temperature. The formation of PSF/SiO2 hybrid microcapsules is confirmed by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), and thermal gravimetric analysis (TGA)...
November 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29147905/transcriptional-regulation-of-dj-1
#6
Kazuko Takahashi-Niki, Takeshi Niki, Sanae M M Iguchi-Ariga, Hiroyoshi Ariga
DJ-1 is an oncogene and also a causative gene for familial Parkinson's disease. DJ-1 has various functions, and the oxidative status of a cysteine residue at position 106 (C106) is crucial for determination of the activation level of DJ-1.DJ-1 binds to many proteins, including various transcription factors, and acts as a coactivator or corepressor for regulating their target genes without direct binding to DNA, thereby affecting various cell functions. DJ-1-regulating transcription factors and their modified proteins are the androgen receptor and its regulatory proteins, p53; polypyrimidine tract-binding protein-associated splicing factor (PSF); Keap1, an inhibitor for nuclear factor erythroid2-related factor 2 (Nrf2); sterol regulatory element-binding protein (SREBP); Ras-responsive element-binding protein (RREB1); signal transducer and activator of transcription 1 (STAT1); and Nurr1...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29147005/binary-phase-masks-for-easy-system-alignment-and-basic-aberration-sensing-with-spatial-light-modulators-in-sted-microscopy
#7
André Klauss, Florian Conrad, Carsten Hille
The use of binary phase patterns to improve the integration and optimization of spatial light modulators (SLM) in an imaging system, especially a confocal microscope, is proposed and demonstrated. The phase masks were designed to create point spread functions (PSF), which exhibit specific sensitivity to major disturbances in the optical system. This allows direct evaluation of misalignment and fundamental aberration modes by simple visual inspection of the focal intensity distribution or by monitoring the central intensity of the PSF...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141388/-effects-of-smp-30-overexpression-on-apoptosis-of-human-lens-epithelial-cells-induced-by-ultraviolet-b-irradiation
#8
H Teng, L Y Huang, F Tian, L J Dong, H Zhang
Objective: This study was to observe the effect of SMP-30 on ultraviolet B (UVB)-induced apoptosis of human lens epithelial cells(HLE-B3) in vitro. Methods: Experimental study. The SMP-30 cDNA was amplified by PCR and inserted into the pRFP-N1 expressing vector which had been double digested by XhoI/HindIII. HLE-B3 cells were cultured and divided into three groups: normal group, pRFP-N1 vector plasmid group and pRFP-N1-SMP-30 plasmid group (SMP-30). Then cells were exposed to UVB and the survival rate of cells was detected by MTT assay...
November 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29136206/calculation-consequences-and-measurement-of-the-point-spread-function-for-low-loss-inelastic-scattering
#9
R F Egerton
We have previously derived an analytical formula for the point spread function (PSF) that describes the delocalization of low-loss inelastic scattering. Here, we modify the formula to take account variation of scattered-electron phase. The exponentially attenuated Lorentzian form is retained but its halfwidth at half maximum is chosen to provide better agreement with measurements of the median delocalization distance. For low energy losses, the 1/r2 tails of the PSF extend beyond the region of energy deposition, allowing a small-diameter electron probe to provide energy-loss data from relatively undamaged regions of a beam-sensitive specimen...
November 9, 2017: Microscopy
https://www.readbyqxmd.com/read/29111650/surface-engineering-of-thin-film-composite-polyamide-membranes-with-silver-nanoparticles-through-layer-by-layer-interfacial-polymerization-for-antibacterial-properties
#10
Zhongyun Liu, Longbin Qi, Xiaochan An, Caifeng Liu, Yunxia Hu
We developed a simple and facile approach to covalently immobilize Ag nanoparticles (NPs) onto polyamide surfaces of thin film composite membranes through layer-by-layer interfacial polymerization (LBL-IP) for biofouling mitigation. Stable and uniform bovine serum albumin (BSA) capped Ag NPs with an average diameter of around 20 nm were synthesized using BSA as a template under the assistance of sonication, and Ag NPs incorporated thin film composite (TFC) polyamide membrane was then fabricated by LBL-IP on a nanoporous polysulfone (PSf) substrate upon sequential coating with m-phenylenediamine (MPD) aqueous solution, trimesoyl chloride (TMC)-hexane solution, and finally BSA-capped Ag NPs aqueous solution...
November 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29107950/a-new-method-to-determine-cortical-bone-thickness-in-ct-images-using-a-hybrid-approach-of-parametric-profile-representation-and-local-adaptive-thresholds-accuracy-results
#11
Oleg Museyko, Bastian Gerner, Klaus Engelke
MOTIVATION: Cortical bone is an important contributor to bone strength and is pivotal to understand the etiology of osteoporotic fractures and the specific mechanisms of antiosteoporotic treatment regimen. 3D computed tomography (CT) can be used to measure cortical thickness, density, and mass in the proximal femur, lumbar vertebrae, and distal forearm. However, the spatial resolution of clinical whole body CT scanners is limited by radiation exposure; partial volume artefacts severely impair the accurate assessment of cortical parameters, in particular in locations where the cortex is thin such as in the lumbar vertebral bodies or in the femoral neck...
2017: PloS One
https://www.readbyqxmd.com/read/29103186/plant-soil-feedback-effects-can-be-masked-by-aboveground-herbivory-under-natural-field-conditions
#12
Johannes Heinze, Jasmin Joshi
For plants, herbivory and interactions with their surrounding soil ecosystem are crucial factors influencing individual performance and plant-community composition. Until now, research has mostly focused on individual effects of herbivory or plant-soil feedbacks (PSFs) on plant growth and community composition, but few studies have explicitly investigated herbivory in the context of PSFs. These few studies, however, were performed under greenhouse conditions even though PSFs and herbivory may differ between greenhouse and field conditions...
November 4, 2017: Oecologia
https://www.readbyqxmd.com/read/29099708/neuroimaging-characteristics-and-post-stroke-fatigue-within-the-first-6-months-after-ischemic-strokes
#13
M Delva, I Delva
Aim - identify neuroimaging characteristics associated with different post-stroke fatigue (PSF) domains within first 6 months after ischemic strokes. There were enrolled in the study 107 patients with acute ischemic strokes. General PSF and certain PSF domains (global, physical, mental, motivational, activity-related) were measured by multidimensional fatigue inventory-20 (MFI-20) scale at hospital stay, in 1, 3 and 6 months after stroke occurrence. Brain MRI studies included cerebral infarct localization, planimetric measurements of infarct volumes, measurement of brain atrophy indexes (bifrontal, bicaudate, cortical atrophy indexes, width of third ventricle) and evaluation of leukoaraiosis severity, according to Fazekas scale...
October 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29092197/imaging-through-a-thin-scattering-layer-and-jointly-retrieving-the-point-spread-function-using-phase-diversity
#14
Tengfei Wu, Jonathan Dong, Xiaopeng Shao, Sylvain Gigan
Recently introduced angular-memory-effect based techniques enable non-invasive imaging of objects hidden behind thin scattering layers. However, both the speckle-correlation and the bispectrum analysis are based on the statistical average of large amounts of speckle grains, which determines that they can hardly access the important information of the point-spread-function (PSF) of a highly scattering imaging system. Here, inspired by notions used in astronomy, we present a phase-diversity speckle imaging scheme, based on recording a sequence of intensity speckle patterns at various imaging planes, and experimentally demonstrate that in addition to being able to retrieve the image of hidden objects, we can also simultaneously estimate the pupil function and the PSF of a highly scattering imaging system without any guide-star nor reference...
October 30, 2017: Optics Express
https://www.readbyqxmd.com/read/29092194/diffraction-effects-detection-for-hdr-image-based-measurements
#15
A Lucat, R Hegedus, R Pacanowski
Modern imaging techniques have proved to be very efficient to recover a scene with high dynamic range (HDR) values. However, this high dynamic range can introduce star-burst patterns around highlights arising from the diffraction of the camera aperture. The spatial extent of this effect can be very wide and alters pixels values, which, in a measurement context, are not reliable anymore. To address this problem, we introduce a novel algorithm that, utilizing a closed-form PSF, predicts where the diffraction will affect the pixels of an HDR image, making it possible to discard them from the measurement...
October 30, 2017: Optics Express
https://www.readbyqxmd.com/read/29091689/three-dimensional-imaging-of-trapped-cold-atoms-with-a-light-field-microscope
#16
Gordon E Lott, Michael A Marciniak, John H Burke
This research images trapped atoms in three dimensions, utilizing light field imaging. Such a system is of interest in the development of atom interferometer accelerometers in dynamic systems where strictly defined focal planes may be impractical. In this research, a light field microscope was constructed utilizing a Lytro Development Kit micro lens array and sensor. It was used to image fluorescing rubidium atoms in a magneto optical trap. The three-dimensional (3D) volume of the atoms is reconstructed using a modeled point spread function (PSF), taking into consideration that the low magnification (1...
November 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29091675/fast-wide-field-and-distortion-free-telescope-with-curved-detectors-for-surveys-at-ultralow-surface-brightness
#17
Eduard Muslimov, David Valls-Gabaud, Gérard Lemaître, Emmanuel Hugot, Wilfred Jahn, Simona Lombardo, Xin Wang, Pascal Vola, Marc Ferrari
We present the design of an all-reflective, bifolded Schmidt telescope aimed at surveys of extended astronomical objects with extremely low surface brightness. The design leads to a high image quality without any diffracting spider, a large aperture and field of view (FoV), and a small central obstruction that barely alters the point spread function (PSF). As an example, we design a high-quality, 36 cm diameter, fast (f/2.5) telescope working in the visible with a large FoV (1.6°×2.6°). The telescope can operate with a curved detector (or with a flat detector with a field flattener) and a set of filters...
November 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29081657/comparative-analysis-of-the-long-term-effect-of-two-families-of-high-flux-polysulfone-dialysers-on-platelet-count-a-retrospective-cross-sectional-study
#18
Rosaria Del Giorno, Lorenzo Berwert, Silvio Pianca, Giorgia Bianchi, Olivier Giannini, Luca Gabutti
INTRODUCTION: Thrombocytopenia is a potential complication of hemodialysis (HD), and its occurrence has been described even with highly biocompatible polysulfone (PSf) membranes. Dialysis units routinely monitor platelet (PLT) count at the beginning of HD sessions. However, considering that the long-term effects on PLT count could easily be missed, the prevalence of HD-related thrombocytopenia could be underestimated. In the present study, we aimed to investigate the following: 1) the long-term impact of HD treatment on PLT count, comparing two families of dialysis membranes made up of similar PSfs; 2) whether the switch between the dialysis membranes studied significantly affects PLT count; and 3) the prevalence and the risk of HD-induced thrombocytopenia according to the dialysis membranes used...
2017: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/29078097/fast-computation-of-far-field-pulse-echo-psf-of-arbitrary-arrays-for-large-sparse-2-d-ultrasound-array-design
#19
Zhaohui Li, Cheng Chi
Large wideband two-dimensional (2-D) arrays are essential for high-resolution three-dimensional (3-D) ultrasound imaging. Since the tremendous element number of a full sampled large 2-D array is not affordable in any practical 3-D ultrasound imaging system, it is necessary to reduce the element number through sparse 2-D array design. Sparse array design requires that both the positions and weights of the array elements should be arbitrarily alterable. Hence a proper evaluation tool that can deal with arbitrary array is integral to optimizing the array structure and apodization function...
October 10, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29073590/temporal-associations-between-fatigue-depression-and-apathy-after-stroke-results-of-the-cognition-and-affect-after-stroke-a-prospective-evaluation-of-risks-study
#20
Elles Douven, Sebastian Köhler, Syenna H J Schievink, Robert J van Oostenbrugge, Julie Staals, Frans R J Verhey, Pauline Aalten
BACKGROUND: Poststroke fatigue (PSF) is a form of pathological fatigue that can develop after stroke and has a negative impact on functional outcome. PSF is associated with poststroke depression (PSD), which in turn shows similarities with poststroke apathy (PSA). This study aimed at disentangling the temporal associations between PSF and PSD and between PSF and PSA. METHODS: A total of 250 stroke patients were included, of which 243 completed the Fatigue Severity Scale, Montgomery-Åsberg Depression Rating Scale, and Apathy Evaluation Scale at 3 months poststroke, with follow-up measurements at 6 and 12 months after initial testing...
October 26, 2017: Cerebrovascular Diseases
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