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https://www.readbyqxmd.com/read/28822320/bio-active-maneonenes-and-isomaneonene-from-the-red-alga-laurencia-obtusa
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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/28821146/evaluation-of-carboxymethyl-moringa-gum-as-nanometric-carrier
#12
Rimpy, Abhishek, Munish Ahuja
In the present study, carboxymethylation of Moringa oleifera gum was carried out by reacting with monochloroacetic acid. Modified gum was characterised employing Fourier-transform infrared spectroscopy, differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and Rheology study. The carboxymethyl modification of moringa gum was found to increase its degree of crystallinity, reduce viscosity and swelling, increase the surface roughness and render its more anionic. The interaction between carboxymethyl moringa gum and chitosan was optimised by 2-factor, 3-level central composite experimental design to prepare polyelectrolyte nanoparticle using ofloxacin, as a model drug...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821133/single-helix-in-v-type-starch-carrier-determines-the-encapsulation-capacity-of-ethylene
#13
Linfan Shi, Xiong Fu, Qiang Huang, Bin Zhang
V-type starch carriers with different single helix contents were prepared using alcoholic-alkaline treatment followed by ethanol precipitation. Ethylene gas was entrapped into V-type starch carriers using a solid encapsulation method. The morphological and structural properties of inclusion complexes (ICs) were characterized using scanning electron and light microscopy, X-ray diffractometry, (13)C solid-state nuclear magnetic resonance (NMR) and Raman spectroscopy. Aqueous ethanol treatment resulted in swelling and aggregation of starch granules, and B-type diffraction reflections were either reduced or completely lost with evolution of V-type pattern...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821132/the-effect-of-%C3%AE-cyclodextrin-on-poly-pseudo-rotaxane-nanoparticles-self-assembled-by-protoporphyrin-modified-poly-ethylene-glycol-for-anticancer-drug-delivery
#14
Taotao Xu, Junhua Li, Jun Cao, Wenxia Gao, Li Li, Bin He
Poly(pseudo)rotaxane (PPR) nanoparticles was facilely prepared using poly(ethylene glycol) (PEG) modified with protoporphyrin (PpIX) and α-cyclodextrin (α-CD) via host-guest interaction, the effect of α-CD number on the nanoparticle properties was investigated. The PEG with protoporphyrin (PEG-PpIX) end capping was synthesized via coupling reaction and the poly(pseudo)rotaxane nanoparticles with different amount of α-CD were fabricated by host-guest interaction between mPEG-PpIX and α-CDs. The final product was characterized by nuclear magnetic spectrum ((1)H NMR), X-ray diffraction (XRD), atomic force microscope (AFM) and dynamic light scattering (DLS)...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821116/active-release-coating-of-multilayer-assembled-branched-and-ionic-%C3%AE-cyclodextrins-onto-poly-ethylene-terephthalate
#15
Leyre Pérez-Álvarez, Leire Ruiz-Rubio, Erlantz Lizundia, Estíbaliz Hernáez, Luis M León, Jose Luis Vilas-Vilela
Branched ionic cyclodextrins multilayers were assembled onto the surface of previously aminolyzed poly(ethylene terephthalate) in order to construct local drug delivery tailored platforms with potential applicability as materials for indwelling medical devices. The construction of the multilayers took place by the alternate deposition of ionic cyclodextrin derivatives and was characterized by surface zeta-potential measurements, X-ray photoelectron spectroscopy and, after fluorescent labeling of anionic branched cyclodextrins, by UV-vis spectroscopy and confocal fluorescence spectroscopy...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821113/fabrication-of-thermo-responsive-cotton-fabrics-using-poly-vinyl-caprolactam-co-hydroxyethyl-acrylamide-copolymer
#16
Min Xiao, Edurne González, Alexis Martell Monterroza, Margaret Frey
A thermo-responsive polymer with hydrophilic to hydrophobic transition behavior, poly(vinyl caprolactam-co-hydroxyethyl acrylamide) P(VCL-co-HEAA), was prepared by copolymerization of vinyl caprolactam and N-hydroxyethyl acrylamide via free radical solution polymerization. The resulting copolymer was characterized by Fourier transform infrared spectroscopy (FTIR), (1)H nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA)...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821110/unraveling-the-reaction-mechanism-of-silver-ions-reduction-by-chitosan-from-so-far-neglected-spectroscopic-features
#17
Ana Patrícia Carapeto, Ana Maria Ferraria, Ana Maria Botelho do Rego
Metallic silver nanoparticles were synthesized in aqueous solution using chitosan, as both reducing and stabilizing agent, and AgNO3 as silver precursor aiming the production of solid ultra-thin films. A systematic characterization of the resulting system as a function of the initial concentrations was performed. The combination of UV-vis absorption - and its quantitative analysis - with X-ray photoelectron spectra, light scattering measurements and atomic force microscopy allowed obtaining a rational picture of silver reduction mechanism through the identification of the nature of the formed reduced/oxidized species...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821107/relationship-between-multi-scale-structures-and-properties-of-photophobic-films-based-on-hydroxypropyl-methylcellulose-and-monosodium-phosphate
#18
Liang Zhang, Yan Zhao, Jian-Ya Qian, Shan Jiang, Jun Liu, Xiao-Long He
Photophobic (white) films were prepared with hydroxypropyl methylcellulose (HPMC) and monosodium phosphate (NaH2PO4) to overcome the redox reaction induced by titanium dioxide photocatalysis of HPMC/TiO2 white film. What's more, HPMC/NaH2PO4 white film could overcome the drying temperature dependent property of white films based on HPMC and calcium salts. Attenuated total reflection Fourier transform infrared spectroscopy, wide angel X-ray diffraction, small angle X-ray scattering, scanning electron microscope and texture analyzer were used to investigate the effect of NaH2PO4 on the short-range, supra-molecular structures and properties of HPMC film...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821066/mechanical-properties-improvement-of-chitosan-films-via-the-use-of-plasticizer-charge-modifying-agent-and-film-solution-homogenization
#19
Sarinya Prateepchanachai, Wasina Thakhiew, Sakamon Devahastin, Somchart Soponronnarit
Glycerol, charge modifying agent (NaCl) and high-pressure homogenization were used to prepare chitosan film-forming solution prior to drying to improve mechanical properties of the resulting films. Zeta potential and viscosity of each film solution were measured, while mechanical properties viz. tensile strength and percent elongation of the films were assessed. X-ray diffraction analysis, Fourier transform infrared spectroscopy and dynamic mechanical analysis results of the films were obtained and used to explain the mechanical property data...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821063/development-and-characterization-of-banana-flour-film-incorporated-with-montmorillonite-and-banana-starch-nanoparticles
#20
Aungkana Orsuwan, Rungsinee Sothornvit
Banana flour film is an alternative biopolymer material but still needs improvement of its mechanical properties and water vapor permeability. Banana starch nanoparticles (BSNs), prepared using miniemulsion cross-linking, make an interesting reinforcing agent. The properties of plasticized banana flour film (PBF) were characterized incorporated with 5% (w/w) of either montmorillonite; MMT-Na(+) (PBF-M) or BSN (PBF-B), including a mixture of nanoparticles at 1:1 for 5% (PBF-MB5) and 10% (PBF-MB10). PBF-MB5 provided better improvement in the film mechanical and water barrier properties compared with PBF-B...
October 15, 2017: Carbohydrate Polymers
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