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https://www.readbyqxmd.com/read/29442822/surfactant-coated-silica-nanoparticles-as-smart-scavengers-for-adsorptive-removal-of-naphthalene
#1
Savita Chaudhary, Priyanka Sharma, Arshpreet Kaur, Rajeev Kumar, S K Mehta
This manuscript represents the synthesis of silica nanoparticles modified with four different types of cationic surfactants. The surfactant capped nanoparticles have better control over the size of silica nanoparticles. The as formed as model nanomaterials were used for the removal of naphthalene, a simple white crystalline polycyclic aromatic hydrocarbon (PAH) from aqueous media. The obtained materials were characterized by various microscopic and spectroscopic techniques. The average particle size of nanoparticles was approximately between 50 and 75 nm...
May 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29395709/aortic-arch-reconstructive-surgery-with-conventional-techniques-vs-frozen-elephant-trunk-a-systematic-review-and-meta-analysis
#2
REVIEW
Hasib Hanif, Luc Dubois, Maral Ouzounian, Mark D Peterson, Ismail El-Hamamsy, Francois Dagenais, Ansar Hassan, Michael W A Chu
BACKGROUND: Frozen elephant trunk (FET) surgery offers a new alternative in the management of complex thoracic aortic aneurysms and dissections. We performed a systematic review and meta-analysis of comparator observational studies evaluating the efficacy of FET compared with conventional aortic arch surgery, primarily focusing on mortality and stroke as well as the secondary outcomes of spinal cord ischemia, major bleeding, and operative time. METHODS: We searched MEDLINE, EMBASE, PubMed, and the Cochrane Library for trials and studies comparing the FET technique with conventional surgery in patients with aortic aneurysms or dissections, or both...
December 26, 2017: Canadian Journal of Cardiology
https://www.readbyqxmd.com/read/29360611/higher-tacrolimus-blood-concentration-is-related-to-increased-risk-of-post-transplantation-diabetes-mellitus-after-living-donor-liver-transplantation
#3
Jiu-Lin Song, Ming Li, Lu-Nan Yan, Jia-Yin Yang, Jian Yang, Li Jiang
BACKGROUND: /Aims: To investigate the association between tacrolimus (TAC) blood concentration and the risk of post-transplantation diabetes mellitus (PTDM) development after living donor liver transplantation (LDLT). METHODS: This study reviewed the clinical data of 158 adult LDLT recipients. A cut-off of mean trough concentration of TAC (cTAC) value at the sixth month postoperatively was identified using a receptor operating characteristic curve. Other clinical complications rates were compared between different cTAC groups...
January 19, 2018: International Journal of Surgery
https://www.readbyqxmd.com/read/29331620/antagonistic-effect-of-nano-zno-and-cetyltrimethyl-ammonium-chloride-on-the-growth-of-chlorella-vulgaris-dissolution-and-accumulation-of-nano-zno
#4
Na Liu, Yipeng Wang, Fei Ge, Shixiang Liu, Huaixian Xiao
The interaction of nanoparticles with coexisting chemicals affects the fate and transport of nanoparticles, as well as their combined effects on aquatic organisms. Here, we evaluated the joint effect of ZnO nanoparticle (nano-ZnO) and cetyltrimethyl ammonium chloride (CTAC) on the growth of Chlorella vulgaris and explored the possible mechanism. Results showed that an antagonistic effect of nano-ZnO and CTAC (0.1, 0.2 and 0.3 mg L-1) was found because CTAC stop nano-ZnO being broken down into solution zinc ions (Zn2+)...
December 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/28837045/subject-specific-bone-attenuation-correction-for-brain-pet-mr-can-zte-mri-substitute-ct-scan-accurately
#5
Maya Khalifé, Brice Fernandez, Olivier Jaubert, Michael Soussan, Vincent Brulon, Irene Buvat, Claude Comtat
In brain PET/MR applications, accurate attenuation maps are required for accurate PET image quantification. An implemented attenuation correction (AC) method for brain imaging is the single-atlas approach which estimates an AC map from an averaged CT template. As an alternative, we propose to use a Zero Echo Time (ZTE) pulse sequence to segment bone, air and soft tissue. A linear relationship between histogram normalized ZTE intensity and measured CT density in Hounsfield Units (HU) in bone has been established thanks to a CT-MR database of 16 patients...
August 24, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28705930/influence-of-attenuation-correction-by-brain-perfusion-spect-ct-simulated-abnormal-bone-structure-comparison-between-chang-and-ct-methods
#6
Takayuki Shibutani, Masahisa Onoguchi, Nanako Miyamoto, Yasushi Yamamoto, Seigo Kinuya
Introduction: Brain perfusion single photon emission computed tomography (SPECT) has physical phenomena such as attenuation, scatter, and degradation of resolution that impair accuracy on data acquisition. Chang and computed tomography (CT) methods have spread application for attenuation correction (AC) and indicate the utility of AC using a brain phantom without a bone or with a normal bone structure. However, non-uniform AC of an abnormal bone structure such as postoperative bone defect following burr-hole surgery has not yet evaluated...
July 13, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/28695497/comparison-of-ctac-and-prone-imaging-for-the-detection-of-coronary-artery-disease-using-czt-spect
#7
COMPARATIVE STUDY
Shimpei Ito, Akihiro Endo, Taiji Okada, Taku Nakamura, Takashi Sugamori, Nobuyuki Takahashi, Hiroyuki Yoshitomi, Kazuaki Tanabe
BACKGROUND: Cadmium-zinc-telluride (CZT) cameras have improved the evaluation of patients with chest pain. However, inferior/inferolateral attenuation artifacts similar to those seen with conventional Anger cameras persist. We added prone acquisitions and CT attenuation correction (CTAC) to the standard supine image acquisition and analyzed the resulting examinations. METHODS AND RESULTS: Seventy-two patients referred for invasive coronary angiography (CAG), and who also underwent rest/stress myocardial perfusion imaging (MPI) on a CZT camera in the supine and prone positions plus CTAC imaging, to examine known or suspected CAD between April 2013 and March 2014 were included...
October 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28671762/aqueous-phase-synthesis-of-size-tunable-copper-nanocubes-for-efficient-aryl-alkyne-hydroboration
#8
Subashchandrabose Thoka, Mahesh Madasu, Chi-Fu Hsia, Shu-Ya Liu, Michael H Huang
Copper nanocubes with average sizes of 82, 95, and 108 nm have been synthesized in an aqueous mixture of cetyltrimethylammonium chloride (CTAC) surfactant, copper acetate, and sodium ascorbate reductant heated at 100 °C for 40 min. Copper nanowires with an average length of 25 μm can also be prepared this way by simply increasing the volume of sodium ascorbate introduced. Small shifts in the plasmonic absorption band positions with tunable particle sizes have been observed. The copper nanocubes were employed to catalyze hydroboration of phenylacetylene and various substituted aryl alkynes with 100 % (E)-product selectivity and 82-95 % product yields...
July 3, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28664319/effect-of-resolution-recovery-using-graph-plots-on-regional-cerebral-blood-flow-in-healthy-volunteers
#9
Nobuhiro Yada, Hideo Onishi, Masahiro Miyai, Kentarou Ozasa, Takashi Katsube, Keiichi Onoda, Masuo Haramoto, Yasushi Yamamoto, Shuhei Yamaguchi, Hajime Kitagaki
PURPOSE: We evaluated the effect of resolution recovery (RR) using graph plots on regional cerebral blood flow (rCBF) in brain perfusion single-photon emission computed tomography (SPECT) images derived from healthy volunteers and patients diagnosed with probable Alzheimer's disease. METHOD: We acquired brain perfusion SPECT images with scatter correction (SC), computed tomography-based attenuation correction (CTAC), and RR from a three-dimensional brain phantom and from healthy volunteers...
August 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28548169/photophysicochemical-characterization-of-mycosporine-like-amino-acids-in-micellar-solutions
#10
D E Orallo, S G Bertolotti, M S Churio
The properties and photochemical and photophysical behavior of the mycosporine-like amino acids (MAAs) shinorine and porphyra-334 were experimentally evaluated in solutions of direct ionic micelles as simple biomimicking environments. The preferential partition of the natural molecules in the aqueous phase of sodium dodecyl sulfate (SDS) or cetyltrimethylammonium chloride (CTAC) micellar systems is confirmed. Although the proton dissociation of the carboxylic groups in the MAAs is slightly inhibited in CTAC solutions, the molecules are predicted to be in the form of zwitterions in all the explored media around physiological pH...
July 1, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28473594/evaluation-of-sinus-edge-corrected-zte-based-attenuation-correction-in-brain-pet-mri
#11
Jaewon Yang, Florian Wiesinger, Sandeep Kaushik, Dattesh Shanbhag, Thomas A Hope, Peder E Z Larson, Youngho Seo
Purpose: In brain positron emission tomography/magnetic resonance imaging (PET/MRI), the major challenge of zero-echo-time (ZTE)-based attenuation correction (ZTAC) is the misclassification of air/tissue/bone mixtures or their boundaries. Our study aimed to evaluate a sinus/edge corrected (SEC) ZTAC (ZTACSEC), relative to an "uncorrected (UC)" ZTAC (ZTACUC) and a computed tomography (CT) atlas-based attenuation correction (ATAC). Materials and Methods: Whole-body fluorodeoxyglucose PET/MRI scans were performed for twelve patients, following PET/CT scans...
May 4, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28470401/low-dose-attenuation-correction-in-diagnosis-of-non-alcoholic-fatty-liver-disease
#12
Amjad M Ahmed, Mohamed E Ebid, Amr M Ajlan, Mouaz H Al-Mallah
BACKGROUND: Non-enhanced computed tomography (CT) is a valuable modality in the diagnosis of non-alcoholic fatty liver disease (NAFLD). However, it is not clear if low-dose CT attenuation correction (CTAC) scans have the same accuracy to diagnose NAFLD. Our aim is to evaluate the diagnostic accuracy of low-dose CTAC in the diagnosis of NAFLD using non-enhanced CT as a gold standard. METHODS: A total of 864 patients who underwent a clinically indicated hybrid nuclear imaging scanning between May 2011 and April 2014 were included in the study...
October 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28437699/structure-and-dynamics-of-cetyltrimethylammonium-chloride-sodium-dodecylsulfate-ctac-sds-catanionic-vesicles-high-value-nano-vehicles-from-low-cost-surfactants
#13
Irene Russo Krauss, Riccardo Imperatore, Augusta De Santis, Alessandra Luchini, Luigi Paduano, Gerardino D'Errico
HYPOTHESIS: Catanionic vesicles based on large-scale produced surfactants represent a promising platform for the design of innovative, effective and relatively inexpensive nano-vehicles for a variety of actives. Structural, dynamic and functional behavior of these aggregates is finely tuned by the molecular features of their components and can be opportunely tailored for their applications as drug carriers. EXPERIMENTS: Here we investigate the aggregates formed by CTAC and SDS, two of the most diffused surfactants, by means of Dynamic Light Scattering, Small Angle Neutron Scattering and Electron Paramagnetic Resonance spectroscopy (EPR)...
April 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28418580/effect-of-surfactant-species-and-electrophoretic-medium-composition-on-the-electrophoretic-behavior-of-neutral-and-water-insoluble-linear-synthetic-polymers-in-nonaqueous-capillary-zone-electrophoresis
#14
Nao Fukai, Shinya Kitagawa, Hajime Ohtani
We have recently demonstrated the separation of neutral and water-insoluble linear synthetic polymers in nonaqueous capillary zone electrophoresis (NACZE) using a cationic surfactant of cetyltrimethylammonium chloride (CTAC). In this study, eight ionic surfactants were investigated for the separation of four synthetic polymers (polystyrene, polymethylmethacrylates, polybutadiene, and polycarbonate); only three surfactants (CTAC, dimethyldioctadecylammonium bromide, and sodium dodecylsulfate) caused their separation...
July 2017: Electrophoresis
https://www.readbyqxmd.com/read/28378112/automatic-determination-of-cardiovascular-risk-by-ct-attenuation-correction-maps-in-rb-82-pet-ct
#15
Ivana Išgum, Bob D de Vos, Jelmer M Wolterink, Damini Dey, Daniel S Berman, Mathieu Rubeaux, Tim Leiner, Piotr J Slomka
BACKGROUND: We investigated fully automatic coronary artery calcium (CAC) scoring and cardiovascular disease (CVD) risk categorization from CT attenuation correction (CTAC) acquired at rest and stress during cardiac PET/CT and compared it with manual annotations in CTAC and with dedicated calcium scoring CT (CSCT). METHODS AND RESULTS: We included 133 consecutive patients undergoing myocardial perfusion (82)Rb PET/CT with the acquisition of low-dose CTAC at rest and stress...
April 4, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28336781/quantitative-evaluation-of-2-scatter-correction-techniques-for-18-f-fdg-brain-pet-mri-in-regard-to-mr-based-attenuation-correction
#16
Jarmo Teuho, Virva Saunavaara, Tuula Tolvanen, Terhi Tuokkola, Antti Karlsson, Jouni Tuisku, Mika Teräs
In PET, corrections for photon scatter and attenuation are essential for visual and quantitative consistency. MR attenuation correction (MRAC) is generally conducted by image segmentation and assignment of discrete attenuation coefficients, which offer limited accuracy compared with CT attenuation correction. Potential inaccuracies in MRAC may affect scatter correction, because the attenuation image (μ-map) is used in single scatter simulation (SSS) to calculate the scatter estimate. We assessed the impact of MRAC to scatter correction using 2 scatter-correction techniques and 3 μ-maps for MRAC...
October 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28221812/intermicellar-interactions-and-the-viscoelasticity-of-surfactant-solutions-complementary-use-of-sans-and-saxs
#17
Viviane Lutz-Bueno, Marianne Liebi, Joachim Kohlbrecher, Peter Fischer
In ionic surfactant micelles, basic interactions among distinct parts of surfactant monomers, their counterion, and additives are fundamental to tuning molecular self-assembly and enhancing viscoelasticity. Here, we investigate the addition of sodium salicylate (NaSal) to hexadecyltrimethylammonium chloride and bromide (CTAC and CTAB) and 1-hexadecylpyridinium chloride and bromide (CPyCl and CPyBr), which have distinct counterions and headgroup structures but the same hydrophobic tail. Different contrasts are obtained from small-angle neutron scattering (SANS), which probes differences between the nucleus of atoms, and X-rays SAXS, which probes differences in electron density...
March 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28165328/evaluation-of-mlacf-based-calculated-attenuation-brain-pet-imaging-for-fdg-patient-studies
#18
Harshali Bal, Vladimir Y Panin, Guenther Platsch, Michel Defrise, Charles Hayden, Chloe Hutton, Benjamin Serrano, Benoit Paulmier, Michael E Casey
Calculating attenuation correction for brain PET imaging rather than using CT presents opportunities for low radiation dose applications such as pediatric imaging and serial scans to monitor disease progression. Our goal is to evaluate the iterative time-of-flight based maximum-likelihood activity and attenuation correction factors estimation (MLACF) method for clinical FDG brain PET imaging. FDG PET/CT brain studies were performed in 57 patients using the Biograph mCT (Siemens) four-ring scanner. The time-of-flight PET sinograms were acquired using the standard clinical protocol consisting of a CT scan followed by 10 min of single-bed PET acquisition...
April 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28161808/does-applying-resolution-recovery-to-normal-databases-confer-an-advantage-over-conventional-3d-stereotactic-surface-projection-techniques
#19
Nobuhiro Yada, Hideo Onishi, Masahiro Miyai, Kentarou Ozasa, Takashi Katsube, Keiichi Onoda, Masuo Haramoto, Yasushi Yamamoto, Shuhei Yamaguchi, Hajime Kitagaki
We evaluated a novel normal database (NDB) generated using single photon emission computed tomography (SPECT) data obtained from healthy brains by using a SPECT/CT system, analyzed using a resolution recovery (RR) technique applied to the three-dimensional stereotactic surface projection (3D-SSP) technique. We used a three-dimensional ordered subset expectation maximization method (3D-OSEM) with applied scatter correction (SC), attenuation correction, and RR to reconstruct the data. We verified the accuracy of the novel NDB's values (Z, extent, and error scores), and compared the novel NDB to the 3D-SSP technique by using simulated misery perfusion-related patient data from a conventional NDB...
June 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28135627/study-on-the-transformation-from-linear-to-branched-wormlike-micelles-an-insight-from-molecular-dynamics-simulation
#20
Pan Wang, Shuai Pei, Muhan Wang, Youguo Yan, Xiaoli Sun, Jun Zhang
Transformation from linear to branched wormlike micelle generally results in the dramatic loss of viscoelasticity. In this study, adopting Coarse-grained molecular dynamics simulation, the conformational transformation was studied in a binary system of cetyltrimethylammonium chloride (CTAC) and sodium salicylate (Nasal). A gross conformation diagram of micelle at different CTAC concentrations and molar ratios of CTAC/Nasal indicates that the branched structure could form at zeta potential lower than 32mV. Further, the dynamic process displays that four sequential stages, approaching, forming salt bridge, yielding stalk, and coalescing together, involve in this transformation...
May 15, 2017: Journal of Colloid and Interface Science
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