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https://www.readbyqxmd.com/read/28823034/effect-of-pristine-and-functionalized-single-and-multi-walled-carbon-nanotubes-on-co2-separation-of-mixed-matrix-membranes-based-on-polymers-of-intrinsic-microporosity-pim-1-a-molecular-dynamics-simulation-study
#1
Karim Golzar, Hamid Modarress, Sepideh Amjad-Iranagh
Molecular dynamics (MD) and grand canonical Monte Carlo (GCMC) simulations were conducted to investigate the transport properties of carbon dioxide, methane, nitrogen, and oxygen through pure and mixed matrix membranes (MMMs) based on polymers of intrinsic microporosity (PIM-1). For this purpose, first, 0.5 to 3 wt% of pristine single-walled carbon nanotube (p-SWCNT) and multi-walled carbon nanotube (p-MWCNT) were embedded into the pure PIM-1, and then for better dispersion of CNT particles into the polymer matrix and to improve the performance of the resulting MMMs, polyethylene glycol (PEG) functionalized SWCNT and MWCNT (f-SWCNT and f-MWCNT, respectively) were loaded...
August 19, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28822938/do-natural-biofilm-impact-nzvi-mobility-and-interactions-with-porous-media-a-column-study
#2
Marc Crampon, Jennifer Hellal, Christophe Mouvet, Guillaume Wille, Caroline Michel, Anke Wiener, Juergen Braun, Patrick Ollivier
Nanoparticles (NP) used as remediation agents for groundwater treatment may interact with biofilms naturally present, altering NP mobility and/or reactivity and thereby NP effectiveness. The influence of the presence of a multi species biofilm on the mobility of two types of zero-valent iron NP (nZVI; NANOFER 25S and optimized NANOFER STAR, NanoIron s.r.o. (Czech Republic)) was tested in laboratory experiments with columns mimicking aquifer conditions. Biofilms were grown in columns filled with sand in nitrate reducing conditions using groundwater from an industrial site as inoculum...
August 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822874/spray-drying-ternary-amorphous-solid-dispersions-of-ibuprofen-an-investigation-into-critical-formulation-and-processing-parameters
#3
Ahmad Ziaee, Ahmad B Albadarin, Luis Padrela, Alexandra Faucher, Emmet O'Reilly, Gavin Walker
A design of experiment (DoE) approach was used to investigate the critical formulation and processing parameters in spray drying ternary amorphous solid dispersions (ASDs) of ibuprofen. A range of 16 formulations of ibuprofen, HPMCP-HP55 and Kollidon VA 64 were spray dried. Statistical analysis revealed the interrelation of various spray drying process conditions and formulation factors, namely solution feed rate, inlet temperature, Active Pharmaceutical Ingredient (API)/excipients ratio and dichloromethane (DCM) /methanol (MeOH) ratio...
August 16, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28822865/formation-and-morphogenesis-of-a-cuttlebone-s-aragonite-biomineral-structures-for-the-common-cuttlefish-sepia-officinalis-on-the-nanoscale-revisited
#4
Vida Čadež, Srečo D Škapin, Adrijana Leonardi, Igor Križaj, Saša Kazazić, Branka Salopek-Sondi, Ivan Sondi
This study describes and examines the structural and morphological properties of the hierarchically organized, aragonite cuttlebone forms for the common cuttlefish (Sepia officinalis, L.), including its main structural parts, the dorsal shield, and the chambers. Specifically, it complements the mechanism for the self-organized formation of aragonite, identifies the presence, and determines the role of soluble organic matrix (SOM) proteins in the morphogenesis of the cuttlebone's biomineral structures on the nanoscale...
August 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28822863/an-x-ray-absorption-fine-structure-spectroscopy-study-of-metal-sorption-to-graphene-oxide
#5
Allison R Showalter, Thomas A Duster, Jennifer E S Szymanowski, Chongzheng Na, Jeremy B Fein, Bruce A Bunker
Remediation and prevention of environmental contamination by toxic metals is an ongoing issue. Additionally, improving water filtration systems is necessary to prevent toxic metals from circulating through the water supply. Graphene oxide (GO) is a highly sorptive material for a variety of heavy metals under different ionic strength conditions over a wide pH range, making it a promising candidate for use in metal adsorption from contaminated sites or in filtration systems. We present X-ray absorption fine structure (XAFS) spectroscopy results investigating the binding environment of Cd (II), U(VI) and Pb(II) ions onto multi-layered graphene oxide (MLGO)...
August 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28822825/comparison-of-transforaminal-lumbar-interbody-fusion-outcomes-in-patients-receiving-rhbmp-2-versus-autograft
#6
Taleef R Khan, Kalin R Pearce, Steven J McAnany, Colleen M Peters, Munish C Gupta, Lukas P Zebala
BACKGROUND CONTEXT: Recombinant human bone morphogenetic protein 2 (rhBMP-2) plays a pivotal role in complex spine surgery. Despite its limited approval, the off-label use of rhBMP-2 is prevalent, particularly in transforaminal lumbar interbody fusions (TLIF) PURPOSE: To determine the effectiveness and safety of rhBMP-2 use in TLIF procedures versus autograft. STUDY DESIGN: Retrospective Cohort Study PATIENT SAMPLE: Patients older than 18 years undergoing spine surgery for lumbar degenerative spine disease at a single academic institution...
August 16, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28822670/peritrapezial-osteoarthritis-inter-and-intraobserver-reliability-of-the-allieu-classification
#7
F Vigouroux, F Rabarin, J Jeudy, N Bigorre, Y Saint Cast, L Pechmajou, G Raimbeau
The Allieu classification takes into consideration the distal and proximal joints of the trapezium. Trapeziometacarpal (TMC) joint arthritis, TMC joint instability (TMI) and scapho-trapezio-trapezoid (STT) joint arthritis are considered independently, which better corresponds to the anatomical examinations. The aim of the study was to evaluate the inter- and intraobserver reliability of the Allieu classification of the peritrapezial arthritis. This was a prospective, single-center study performed from May to September 2016 with 30 cases of primary thumb osteoarthritis...
August 16, 2017: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/28822629/acute-intrapartum-rupture-of-the-pubic-symphysis-requiring-resuscitation-and-surgical-intervention-a-case-report
#8
Marie Buitendyk, Barbara Brennan, Parag Vora, Patricia Smith, Stephanie Winsor
BACKGROUND: Pubic symphysis rupture significant enough to cause serious complications or require surgical intervention is exceedingly rare. Here we review the literature and examine the details of a unique presentation. CASE: A 27-year-old woman presented in labour at 34+6 weeks gestation after an uncomplicated monochorionic-diamniotic twin pregnancy. After vaginal delivery, she developed a substantial labial hematoma. Hours later, she became hemodynamically unstable...
August 16, 2017: Journal of Obstetrics and Gynaecology Canada: JOGC, Journal D'obstétrique et Gynécologie du Canada: JOGC
https://www.readbyqxmd.com/read/28822320/bio-active-maneonenes-and-isomaneonene-from-the-red-alga-laurencia-obtusa
#9
Nahed O Bawakid, Walied M Alarif, Ali I Ismail, Mohamed E El-Hefnawy, Khalid O Al-Footy, Sultan S Al-Lihaibi
Three previously undescribed compounds, maneonenes and isomaneonene derivatives; in addition to five known compounds, two cuparene, one chamigrene, and two cis-maneonenes were isolated from the Red Sea red alga Laurencia obtusa. The chemical structures of all unknown metabolites were characterized employing spectroscopic methods and then were further confirmed by single crystal X-ray analysis. Jeddahenyne A has C-5-C-12 etheric linkage and C-13-C-14 carbon-carbon double bond; Jeddahenyne B has in addition to the aforementioned etheric linkage a C-13 carbonyl function and absence of halogenation, unusual features for the maneonenes while 12-debromo-12-methoxy isomaneonene A shows unrecorded methoxylation at C-12...
August 16, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28822249/en-masse-pyrolysis-of-flexible-printed-circuit-board-wastes-quantitatively-yielding-environmental-resources
#10
Jang Won Kim, Albert S Lee, Seunggun Yu, Jeong Whan Han
This paper reports the recycling of flexible printed circuit board (FPCB) waste through carbonization of polyimide by dual pyrolysis processes. The organic matter was recovered as pyrolyzed oil at low temperatures, while valuable metals and polyimide-derived carbon were effectively recovered through secondary high temperature pyrolysis. The major component of organics extracted from FPCB waste comprised of epoxy resins were identified as pyrolysis oils containing bisphenol-A. The valuable metals (Cu, Ni, Ag, Sn, Au, Pd) in waste FPCB were recovered as granular shape and quantitatively analyzed via ICP-OES...
August 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28822246/perfluorooctane-sulfonate-pfos-removal-with-pd-0-nfe-0-nanoparticles-adsorption-or-aqueous-fe-complexation-not-transformation
#11
Saerom Park, Jenny E Zenobio, Linda S Lee
PFOS removal at 6 and 21days (d) when reacted with palladium coated zero valent iron nanoparticles (Pd(0)/nFe(0) NPs) was quantified as a function of pH (3.6, 5.5, and 8.7) and temperature (22, 45 and 70°C). PFOS concentrations were measured in aqueous phases and NP extracts. The greatest PFOS removal occurred at 6 d with the lowest pH and highest temperature; however, recovered PFOS increased at 21 d. Furthermore, neither F(-) nor SO4(2-) (from SO3(2-) cleavage) generation was observed indicating the absence of PFOS transformation...
August 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28822076/studies-of-the-benzopyran-class-of-selective-cox-2-inhibitors-using-3d-qsar-and-molecular-docking
#12
Dharmendra K Yadav, Saloni, Praveen Sharma, Sanjeev Misra, Harpreet Singh, Ricardo L Mancera, Kang Kim, Cheongyun Jang, Mi-Hyun Kim, Horacio Pérez-Sánchez, Eun Ha Choi, Surendra Kumar
The Gaussian-based 3D-QSAR studies for 58 selective COX-2 (cyclooxygenase-2) inhibitors belonging to benzopyran chemical class were performed. Partial least squares analysis produced statistically significant model with (R training(2)  = 0.866) and predictability (Q training(2)  = 0.66, Q test(2)  = 0.846). The 3D-QSAR model includes steric, electrostatic, hydrophobic, and hydrogen bond acceptor field indicators, whereas the potential field contributions indicate that the steric and hydrophobic features of the molecules play an important role in governing their biological activity...
August 18, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28822074/general-equations-for-optimal-selection-of-diagnostic-image-acquisition-parameters-in-clinical-x-ray-imaging
#13
Xiaoming Zheng
The purpose of this work was to examine the effects of relationship functions between diagnostic image quality and radiation dose on the governing equations for image acquisition parameter variations in X-ray imaging. Various equations were derived for the optimal selection of peak kilovoltage (kVp) and exposure parameter (milliAmpere second, mAs) in computed tomography (CT), computed radiography (CR), and direct digital radiography. Logistic, logarithmic, and linear functions were employed to establish the relationship between radiation dose and diagnostic image quality...
August 18, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28821988/presentation-and-management-of-symptomatic-central-bone-cement-embolization
#14
Ahmed Samir Barakat, Tamer Owais, Mohamed Alhashash, Mootaz Shousha, Hesham El Saghir, Bernward Lauer, Heinrich Boehm
BACKGROUND CONTEXT: With more cement augmentation procedures done, the occurrence of serious complications is also expected to rise. Symptomatic central cement embolization is a rare but very serious complication. Moreover, the pathophysiology and treatment of intrathoracic cement embolism remain controversial. PURPOSE: In this case series, we are trying to identify various presentations and suggest our emergent management scheme for symptomatic central cement embolization...
August 18, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28821871/fermi-surface-and-effective-masses-in-photoemission-response-of-the-ba1-x-k-x-fe2as2-superconductor
#15
Gerald Derondeau, Federico Bisti, Masaki Kobayashi, Jürgen Braun, Hubert Ebert, Victor A Rogalev, Ming Shi, Thorsten Schmitt, Junzhang Ma, Hong Ding, Vladimir N Strocov, Ján Minár
The angle-resolved photoemission spectra of the superconductor (Ba1-x K x )Fe2As2 have been investigated accounting coherently for spin-orbit coupling, disorder and electron correlation effects in the valence bands combined with final state, matrix element and surface effects. Our results explain the previously obscured origins of all salient features of the ARPES response of this paradigm pnictide compound and reveal the origin of the Lifshitz transition. Comparison of calculated ARPES spectra with the underlying DMFT band structure shows an important impact of final state effects, which result for three-dimensional states in a deviation of the ARPES spectra from the true spectral function...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821822/bladder-cancer-treatment-response-assessment-in-ct-using-radiomics-with-deep-learning
#16
Kenny H Cha, Lubomir Hadjiiski, Heang-Ping Chan, Alon Z Weizer, Ajjai Alva, Richard H Cohan, Elaine M Caoili, Chintana Paramagul, Ravi K Samala
Cross-sectional X-ray imaging has become the standard for staging most solid organ malignancies. However, for some malignancies such as urinary bladder cancer, the ability to accurately assess local extent of the disease and understand response to systemic chemotherapy is limited with current imaging approaches. In this study, we explored the feasibility that radiomics-based predictive models using pre- and post-treatment computed tomography (CT) images might be able to distinguish between bladder cancers with and without complete chemotherapy responses...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821805/transmission-zone-plates-as-analyzers-for-efficient-parallel-2d-rixs-mapping
#17
Felix Marschall, Zhong Yin, Jens Rehanek, Martin Beye, Florian Döring, Katharina Kubiček, Dirk Raiser, Sreevidya Thekku Veedu, Jens Buck, André Rothkirch, Benedikt Rösner, Vitaliy A Guzenko, Jens Viefhaus, Christian David, Simone Techert
We have implemented and successfully tested an off-axis transmission Fresnel zone plate as spectral analyzer for resonant inelastic X-ray scattering (RIXS). The imaging capabilities of zone plates allow for advanced two-dimensional (2D) mapping applications. By varying the photon energy along a line focus on the sample, we were able to simultaneously record the emission spectra over a range of excitation energies. Moreover, by scanning a line focus across the sample in one dimension, we efficiently recorded RIXS spectra spatially resolved in 2D, increasing the throughput by two orders of magnitude...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821613/the-rir-motif-in-the-scaffold-protein-xrcc1-mediates-a-low-affinity-interaction-with-polynucleotide-kinase-phosphatase-pnkp-during-dna-single-strand-break-repair
#18
Claire Breslin, Rajam S Mani, Mesfin Fanta, Nicolas Hoch, Michael Weinfeld, Keith W Caldecott
The scaffold protein X-ray repair cross-complementing 1 (XRCC1) interacts with multiple enzymes involved in DNA base excision repair and single-strand break repair (SSBR) and is important for genetic integrity and normal neurological function. One of the most important interactions of XRCC1 is that with polynucleotide kinase/phosphatase (PNKP), a dual-function DNA kinase/phosphatase that processes damaged DNA termini and that, if mutated, results in ataxia with oculomotor apraxia 4 (AOA4) and microcephaly with early-onset seizures and developmental delay (MCSZ)...
August 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28821436/carbon-quantum-dot-tailored-calcium-alginate-hydrogel-for-ph-responsive-controlled-delivery-of-vancomycin
#19
Niladri Sarkar, Gyanaranjan Sahoo, Rashmita Das, Gyanaranjan Prusty, Sarat K Swain
Herein, we demonstrate the preparation of highly luminescent carbon quantum dots (CQDs) from Aloe vera leaf gel; in just 2h at 250°C through carbonization pathway. The prepared CQDs are structurally characterized with high resolution transmission electron microscopy (HRTEM), hydrodynamic diameter and surface polarity, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Raman, UV-visible absorption spectrophotometry and fluorescence spectroscopy. The functional carbon nanoparticles are observed as non-cytotoxic materials...
August 15, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28821227/survey-of-practitioners-competency-for-diagnosis-of-acute-diseases-manifest-on-chest-x-ray
#20
Ghazaleh Mehdipoor, Fatemeh Salmani, Abbas Arjmand Shabestari
BACKGROUND: Chest X-ray (CXR) is a common imaging modality that could impact immediate decision-making for acute chest pathologies. We sought to examine the non-radiologists proficiency of diagnosing acute pathologies manifest on CXR. METHODS: We selected 9 clinical vignettes, each associated with a CXR, wherein only a single acute chest pathology was manifest. We also added a low-risk vignette associated with a normal CXR. We built an electronic survey with the CXR-embedded vignettes and also inquired about the participants' confidence in the diagnosis, and prior exposure to the topics...
August 18, 2017: BMC Medical Imaging
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