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https://www.readbyqxmd.com/read/28212485/efficient-upconverting-multiferroic-core-shell-photocatalysts-visible-to-near-infrared-photon-harvesting
#1
Jianming Zhang, Yue Huang, Lei Jin, Federico Rosei, Fiorenzo Vetrone, Jerome P Claverie
We report the two-step synthesis of a core@shell nanohybrid material for visible-to-near-infrared (NIR) photocatalysis. The core is constituted of NaGdF4:Er(3+), Yb(3+) upconverting nanoparticles (UCNPs). A bismuth ferrite (BFO) shell is assembled around the UCNPs via a hydrothermal process. The photocatalytic degradation assays of organic compounds of methylene orange and 4-chlorophenol reveal that core@shell nanostructures possess remarkably enhanced reaction activity under visible and NIR irradiation, compared to the BFO powder alone and the BFO-UCNP mixture...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28212385/the-effect-of-tumour-size-on-drug-transport-and-uptake-in-3-d-tumour-models-reconstructed-from-magnetic-resonance-images
#2
Wenbo Zhan, Wladyslaw Gedroyc, Xiao Yun Xu
Drug transport and its uptake by tumour cells are strongly dependent on tumour properties, which vary in different types of solid tumours. By simulating the key physical and biochemical processes, a numerical study has been carried out to investigate the transport of anti-cancer drugs in 3-D tumour models of different sizes. The therapeutic efficacy for each tumour is evaluated by using a pharmacodynamics model based on the predicted intracellular drug concentration. Simulation results demonstrate that interstitial fluid pressure and interstitial fluid loss vary non-linearly with tumour size...
2017: PloS One
https://www.readbyqxmd.com/read/28212341/physicochemical-characterization-and-biological-activities-of-the-triterpenic-mixture-%C3%AE-%C3%AE-amyrenone
#3
Rosilene G S Ferreira, Walter F Silva Júnior, Valdir F Veiga Junior, Ádley A N Lima, Emerson S Lima
α-Amyrenone and β-amyrenone are triterpenoid isomers that occur naturally in very low concentrations in several oleoresins from Brazilian Amazon species of Protium (Burseraceae). This mixture can also be synthesized by oxidation of α,β-amyrins, obtained as major compounds from the same oleoresins. Using a very simple, high yield procedure, and using a readily commercially available mixture of α,β-amyrins as substrate, the binary compound α,β-amyrenone was synthesized and submitted to physico-chemical characterization using different techniques such as high-performance liquid chromatography, nuclear magnetic resonance (¹H and (13)C), mass spectrometry, scanning electron microscopy, differential scanning calorimetry, thermogravimetry and derivative thermogravimetry, and Fourier transform infrared spectroscopy (FTIR)...
February 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28212322/detection-of-salmonella-typhimurium-on-spinach-using-phage-based-magnetoelastic-biosensors
#4
Fengen Wang, Shin Horikawa, Jiajia Hu, Howard C Wikle, I-Hsuan Chen, Songtao Du, Yuzhe Liu, Bryan A Chin
Phage-based magnetoelastic (ME) biosensors have been studied as an in-situ, real-time, wireless, direct detection method of foodborne pathogens in recent years. This paper investigates an ME biosensor method for the detection of Salmonella Typhimurium on fresh spinach leaves. A procedure to obtain a concentrated suspension of Salmonella from contaminated spinach leaves is described that is based on methods outlined in the U.S. FDA Bacteriological Analytical Manual for the detection of Salmonella on leafy green vegetables...
February 16, 2017: Sensors
https://www.readbyqxmd.com/read/28212053/transthoracic-echocardiography-pitfalls-and-limitations-as-delineated-at-cardiac-ct-and-mr-imaging
#5
Sachin B Malik, Natalie Chen, Rex A Parker, Joe Y Hsu
Transthoracic echocardiography ( TTE transthoracic echocardiography ) is a critical tool in the field of clinical cardiology. It often serves as one of the first-line imaging modalities in the evaluation of cardiac disease owing to its low cost, portability, widespread availability, lack of ionizing radiation, and ability to evaluate both anatomy and function of the heart. Consequently, a large majority of patients undergoing a cardiac computed tomography (CT) or magnetic resonance (MR) imaging examination will have a TTE transthoracic echocardiography available for review...
February 17, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28212052/proton-density-fat-fraction-measurements-at-1-5-and-3-t-hepatic-mr-imaging-same-day-agreement-among-readers-and-across-two-imager-manufacturers
#6
Suraj D Serai, Jonathan R Dillman, Andrew T Trout
Purpose To determine the agreement of proton density fat fraction (PDFF) measurements obtained with hepatic magnetic resonance (MR) imaging among readers, imager manufacturers, and field strengths. Materials and Methods This HIPAA-compliant study was approved by the institutional review board. After providing informed consent, 24 adult volunteers underwent imaging with one 1.5-T MR unit (Ingenia; Philips Healthcare, Best, the Netherlands) and two different 3.0-T units (750 W [GE Healthcare, Waukesha, Wis] and Ingenia) on the same day to estimate hepatic PDFF...
February 24, 2017: Radiology
https://www.readbyqxmd.com/read/28212047/multimaterial-decomposition-algorithm-for-the-quantification-of-liver-fat-content-by-using-fast-kilovolt-peak-switching-dual-energy-ct-clinical-evaluation
#7
Tomoko Hyodo, Norihisa Yada, Masatoshi Hori, Osamu Maenishi, Peter Lamb, Kosuke Sasaki, Minori Onoda, Masatoshi Kudo, Teruhito Mochizuki, Takamichi Murakami
Purpose To assess the clinical accuracy and reproducibility of liver fat quantification with the multimaterial decomposition (MMD) algorithm, comparing the performance of MMD with that of magnetic resonance (MR) spectroscopy by using liver biopsy as the reference standard. Materials and Methods This prospective study was approved by the institutional ethics committee, and patients provided written informed consent. Thirty-three patients suspected of having hepatic steatosis underwent non-contrast material-enhanced and triple-phase dynamic contrast-enhanced dual-energy computed tomography (CT) (80 and 140 kVp) and single-voxel proton MR spectroscopy within 30 days before liver biopsy...
February 17, 2017: Radiology
https://www.readbyqxmd.com/read/28212030/revisiting-silicalite-1-nucleation-in-clear-solution-by-electrochemical-impedance-spectroscopy
#8
Gert Brabants, Maxim Hubin, Erwin Konrad Reichel, Bernhard Jakoby, Eric Breynaert, Francis Taulelle, Johan A Martens, Christine E A Kirschhock
EIS was used to detect and investigate nucleation in silicalite-1 clear solutions. Whereas zeolite nucleation was previously assumed to be a step event, inducing a sharp discontinuity around a Si/OH ratio of 1, complex bulk conductivity measurements at elevated temperatures reveal a gradual decay of the conductivity with increased silicon concentrations. Inverse Laplace transformation of the complex conductivity allows to observe the chemical exchange phenomena governing nano-aggregate formation. At low temperatures, the fast exchange between dissociated ions and ion pairs leads to a gradual decay of the conductivity with increasing silicon content...
February 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28211968/verse-guided-parallel-rf-excitations-using-dynamic-field-correction
#9
Mustafa Çavuşoğlu, Ronald Mooiweer, Klaas P Pruessmann, Shaihan J Malik
In parallel RF pulse design, peak RF magnitudes and specific absorption rate levels are critical concerns in the hardware and safety limits. The variable rate selective excitation (VERSE) method is an efficient technique to limit the peak RF power by applying a local-only RF and gradient waveform reshaping while retaining the on-resonance profile. The accuracy of the excitation performed by the VERSEd RF and gradient waveforms strictly depends on the performance of the employed hardware. Any deviation from the nominal gradient fields as a result of frequency dependent system imperfections violates the VERSE condition similarly to off-resonance effects, leading to significant excitation errors and the RF pulse not converging to the targeted peak RF power...
February 17, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28211967/generation-of-the-scf3-radical-by-photoredox-catalysis-intra-and-intermolecular-carbotrifluoromethylthiolation-of-alkenes
#10
Guillaume Dagousset, Cédric Simon, Elsa Anselmi, Béatrice Tuccio, Thierry Billard, Emmanuel Magnier
We report herein the first use of N-trifluoromethylthiosaccharin as the source of SCF3 radical under photoredox catalysis. This allowed an efficient and general visible-light-mediated carbotrifluoromethylthiolation of alkenes. Under the optimized conditions using fac-Ir(ppy)3 as the photocatalyst, various N-aryl acrylamides as well as a wide range of substituted styrenes can readily be difunctionalized in an intra- or intermolecular fashion, affording the corresponding SCF3-containing products in good to excellent yield...
February 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28211806/digital-breast-tomosynthesis-plus-mammography-magnetic-resonance-imaging-plus-mammography-and-mammography-alone-a-comparison-of-diagnostic-performance-in-symptomatic-women
#11
Wei Tang, Fei-Xiang Hu, Hui Zhu, Qi-Feng Wang, Ya-Jia Gu, Wei-Jun Peng
PURPOSE: To compare the diagnostic efficiency of digital breast tomosynthesis (DBT) plus digital mammography (DM) and magnetic resonance imaging (MRI) plus DM in symptomatic women. MATERIALS AND METHODS: The protocol used in our study was accepted by the ethics committee at our hospital, and informed consent was obtained from all patients. Between June and December 2014, 197 patients with 238 histologically proven lesions all underwent DM, DBT and MRI. Two radiologists were responsible for interpreting all images according to the Breast Imaging Reporting and Data System (BI-RADS)...
February 17, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28211804/comparison-of-elastography-based-on-transvaginal-ultrasound-and-mri-in-assessing-parametrial-invasion-of-cervical-cancer
#12
Xi Ma, Qi Li, Jian-Liang Wang, Jun Shao, Yu-Chun Zhu, Wei Ding, Hou-Sheng Zhang, Hong-Yan Wang, Jun-Kang Shen
OBJECTIVE: The purpose of this study was to evaluate the clinical value of transvaginal elastography (TVES) combined with high-resolution transvaginal ultrasound (TVS) in the detection of parametrial invasion in cervical cancer and to compare the diagnostic performance with magnetic resonance imaging (MRI). MATERIALS AND METHODS: 52 women with histologically confirmed cervical cancer over a 2-year period were staged using International Federation of Gynecology and Obstetrics (FIGO) criteria and underwent MRI and TVES combined with TVS according to a standardized protocol before treatment...
February 17, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28211716/direct-identification-of-dilute-surface-spins-on-al_-2-o_-3-origin-of-flux-noise-in-quantum-circuits
#13
S E de Graaf, A A Adamyan, T Lindström, D Erts, S E Kubatkin, A Ya Tzalenchuk, A V Danilov
An on-chip electron spin resonance technique is applied to reveal the nature and origin of surface spins on Al_{2}O_{3}. We measure a spin density of 2.2×10^{17}  spins/m^{2}, attributed to physisorbed atomic hydrogen and S=1/2 electron spin states on the surface. This is direct evidence for the nature of spins responsible for flux noise in quantum circuits, which has been an issue of interest for several decades. Our findings open up a new approach to the identification and controlled reduction of paramagnetic sources of noise and decoherence in superconducting quantum devices...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211704/observation-of-classical-quantum-crossover-of-1-f-flux-noise-and-its-paramagnetic-temperature-dependence
#14
C M Quintana, Yu Chen, D Sank, A G Petukhov, T C White, Dvir Kafri, B Chiaro, A Megrant, R Barends, B Campbell, Z Chen, A Dunsworth, A G Fowler, R Graff, E Jeffrey, J Kelly, E Lucero, J Y Mutus, M Neeley, C Neill, P J J O'Malley, P Roushan, A Shabani, V N Smelyanskiy, A Vainsencher, J Wenner, H Neven, John M Martinis
By analyzing the dissipative dynamics of a tunable gap flux qubit, we extract both sides of its two-sided environmental flux noise spectral density over a range of frequencies around 2k_{B}T/h≈1  GHz, allowing for the observation of a classical-quantum crossover. Below the crossover point, the symmetric noise component follows a 1/f power law that matches the magnitude of the 1/f noise near 1 Hz. The antisymmetric component displays a 1/T dependence below 100 mK, providing dynamical evidence for a paramagnetic environment...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211647/clinical-characteristics-predicting-abnormal-brain-magnetic-resonance-image-findings-in-hypoxic-ischemic-encephalopathy-infants
#15
Sook K Yum, Cheong-Jun Moon, Young-Ah Youn, In K Sung
BACKGROUND: The aim of this study was to elucidate the specific clinical characteristics associated with abnormal brain magnetic resonance image(MRI) findings in hypoxic ischemic encephalopathy(HIE) infants in order to discern how to predict poorer outcomes more accurately. METHODS: A retrospective data analysis of HIE infants admitted to the neonatal intensive care unit of a tertiary hospital was performed. Baseline perinatal information and physical and neurological findings were compared in HIE infants according to the presence of abnormal brain MRI findings...
February 17, 2017: Minerva Pediatrica
https://www.readbyqxmd.com/read/28211639/the-use-of-on-line-heart-cutting-high-performance-liquid-chromatography-coupled-with-linear-ion-trap-mass-spectrometry-in-the-identification-of-impurities-in-vidarabine-monophosphate
#16
Hang Wang, Tongzhou Xu, Jiaojian Yuan
It is difficult to identify unknown impurities in nucleotide analogues by mass spectrometry because mass-spectrometry-incompatible mobile phases need to be used to separate the major ingredient from impurities. In this study, vidarabine monophosphate was selected, and unknown impurities were identified by online heart-cutting two-dimensional high performance liquid chromatography and linear ion trap mass spectrometry. The one dimensional reversed phase column was filled with a mobile phase containing non-volatile salt...
February 17, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28211619/intravoxel-incoherent-motion-diffusion-weighted-imaging-of-bone-marrow-in-patients-with-acute-myeloid-leukemia-a-pilot-study-of-prognostic-value
#17
Jinliang Niu, Wenjin Li, Hongwei Wang, Wenqi Wu, Tong Gong, Ning Huang, Jun Wang, Yan Qi
PURPOSE: To investigate the value of intravoxel incoherent motion (IVIM) parameters in evaluation of prognosis in patients with acute myeloid leukemia (AML) before treatment. MATERIALS AND METHODS: Fifty-three patients before standard chemotherapy underwent MRI scans at 1.5 Tesla using conventional diffusion weighted imaging (DWI) and IVIM (b = 0, 10, 25, 50, 100, 200, 400, 600, 800, 1000, 1200 s/mm(2) ) in the sagittal plane covering the lumbar bone marrow...
February 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28211591/magnetic-resonance-imaging-of-the-knee-an-overview-and-update-of-conventional-and-state-of-the-art-imaging
#18
Nicholas C Nacey, Matthew G Geeslin, Grady Wilson Miller, Jennifer L Pierce
: Magnetic resonance imaging (MRI) has become the preferred modality for imaging the knee to show pathology and guide patient management and treatment. The knee is one of the most frequently injured joints, and knee pain is a pervasive difficulty that can affect all age groups. Due to the diverse pathology, complex anatomy, and a myriad of injury mechanisms of the knee, the MRI knee protocol and sequences should ensure detection of both soft tissue and osseous structures in detail and with accuracy...
February 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28211506/wide-band-angle-blazed-surfaces-using-multiple-coupled-blazing-resonances
#19
Mohammad Memarian, Xiaoqiang Li, Yasuo Morimoto, Tatsuo Itoh
Blazed gratings can reflect an oblique incident wave back in the path of incidence, unlike mirrors and metal plates that only reflect specular waves. Perfect blazing (and zero specular scattering) is a type of Wood's anomaly that has been observed when a resonance condition occurs in the unit-cell of the blazed grating. Such elusive anomalies have been studied thus far as individual perfect blazing points. In this work, we present reflective blazed surfaces that, by design, have multiple coupled blazing resonances per cell...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211482/neoadjuvant-chemotherapy-followed-by-concurrent-chemoradiotherapy-versus-concurrent-chemoradiotherapy-alone-in-nasopharyngeal-carcinoma-patients-with-cervical-nodal-necrosis
#20
Mei Lan, Chunyan Chen, Ying Huang, Li Tian, Zhijun Duan, Fei Han, Junfang Liao, Meiling Deng, Terence T Sio, Anussara Prayongrat, Lie Zheng, Shaoxiong Wu, Taixiang Lu
The effectiveness of neoadjuvant chemotherapy (NACT) followed by concurrent chemoradiotherapy (CCRT) compared with CCRT alone in nasopharyngeal carcinoma (NPC) patients who presented with cervical nodal necrosis (CNN) is unknown. A total of 792 patients with stage T1-4N1-3M0 NPC and presented with CNN based on magnetic resonance imaging were retrospectively reviewed. Propensity score matching method was used to balance treatment arms for baseline characteristics. Eventually, 508 patients were propensity-matched on a 1:1 basis to create two groups (NACT + CCRT and CCRT groups)...
February 17, 2017: Scientific Reports
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