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https://www.readbyqxmd.com/read/28930096/simulation-study-of-light-transport-in-laser-processed-lyso-ce-detectors-with-single-side-readout
#1
Lisa Blackberg, Georges El Fakhri, Hamid Sabet
A tightly focused pulsed laser beam can locally modify the crystal structure inside the bulk of a scintillator. The result is incorporation of so-called optical barriers with a refractive index different from that of the crystal bulk, that can be used to redirect the scintillation light and control the light spread in the detector. We here systematically study the scintillation light transport in detectors fabricated using the Laser Induced Optical Barrier technique, and objectively compare their potential performance characteristics with those of the two mainstream detector types: monolithic and mechanically pixelated arrays...
September 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28929810/dynamic-contrast-enhanced-perfusion-area-detector-ct-preliminary-comparison-of-diagnostic-performance-for-n-stage-assessment-with-fdg-pet-ct-in-non-small-cell-lung-cancer
#2
Yoshiharu Ohno, Yasuko Fujisawa, Naoki Sugihara, Yuji Kishida, Shinichiro Seki, Hisanobu Koyama, Takeshi Yoshikawa
OBJECTIVE: The objective of our study was to directly compare the capability of dynamic first-pass contrast-enhanced (CE) perfusion area-detector CT (ADCT) and FDG PET/CT for differentiation of metastatic from nonmetastatic lymph nodes and assessment of N stage in patients with non-small cell lung carcinoma (NSCLC). SUBJECTS AND METHODS: Seventy-seven consecutive patients, 45 men (mean age ± SD, 70.4 ± 5.9 years) and 32 women (71.2 ± 7.7 years), underwent dynamic first-pass CE-perfusion ADCT at two or three different positions for covering the entire thorax, FDG PET/CT, surgical treatment, and pathologic examination...
September 20, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28929504/simultaneous-determination-of-serum-propafenone-and-its-metabolites-using-high-performance-liquid-chromatography
#3
Yuki Shirayama, Kosuke Doki, Yukio Sekiguchi, Kazutaka Aonuma, Yukinao Kohda, Masato Homma
Propafenone, a class Ic antiarrhythmic agent, is metabolized to 5-hydroxypropafeone (5-OHP) and N-depropylpropafenone (NDPP). Simultaneous determination of serum propafenone and its metabolites was performed using high-performance liquid chromatography (HPLC) equipped with a conventional octadecylsilyl silica column and ultraviolet detector. The wavelength was set at 250 nm. Propafenone and its metabolites in the serum were extracted using diethyl ether. The mobile phase solution, comprising 1-pentanesulfonic acid sodium salt (0...
September 19, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28928673/revisiting-theories-of-humidity-transduction-a-focus-on-electrophysiological-data
#4
Harald Tichy, Maria Hellwig, Wolfgang Kallina
Understanding the mechanism of humidity transduction calls for experimental data and a theory to interpret the data and design new experiments. A comprehensive theory of humidity transduction must start with agreement on what humidity parameters are measured by hygroreceptors and processed by the brain. Hygroreceptors have been found in cuticular sensilla of a broad range of insect species. Their structural features are far from uniform. Nevertheless, these sensilla always contain an antagonistic pair of a moist cell and a dry cell combined with a thermoreceptive cold cell...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28927568/a-sensitive-pre-column-derivatization-method-for-the-analysis-of-free-fatty-acids-by-rp-hplc-with-fluorescence-detector-and-its-application-to-caragana-species
#5
Zhi Zeng, Zhongyin Ji, Na Hu, Bo Bai, Honglun Wang, Yourui Suo
Caragana korshinskii Kom. (CK), one of afforestation tree species, is widely planted in northwest region of China. To compare the constituents as references for further utilization of CK, C. microphyll Lam. (CM) and C. jubata L. (CJ), been used as traditional Chinese medicine, were taken into consideration. To obtain more information on CK for further utilization, a sensitive and stable pre-column derivatization method for the analysis of fatty acids (FAs) was established using a novel labeling reagent 2-(5H-benzo[a]-carbazol-11(6H)-yl)ethyl hydrazine-carboxylate (BCEHC) by HPLC with fluorescence detector...
July 24, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28926863/evaluation-of-cannabinoid-and-terpenoid-content-cannabis-flower-compared-to-supercritical-co2-concentrate
#6
Michelle Sexton, Kyle Shelton, Pam Haley, Mike West
A recent cannabis use survey revealed that 60% of cannabis users rely on smelling the flower to select their cannabis. Olfactory indicators in plants include volatile compounds, principally represented by the terpenoid fraction. Currently, medicinal- and adult-use cannabis is marketed in the United States with relatively little differentiation between products other than by a common name, association with a species type, and Δ-9 tetrahydrocannabinol/cannabidiol potency. Because of this practice, how terpenoid compositions may change during an extraction process is widely overlooked...
September 19, 2017: Planta Medica
https://www.readbyqxmd.com/read/28926370/photon-counting-computed-tomography-for-vascular-imaging-of-the-head-and-neck-first-in-vivo-human-results
#7
Rolf Symons, Daniel S Reich, Mohammadhadi Bagheri, Tyler E Cork, Bernhard Krauss, Stefan Ulzheimer, Steffen Kappler, David A Bluemke, Amir Pourmorteza
PURPOSE: The purpose of this study was to evaluate image quality of a spectral photon-counting detector (PCD) computed tomography (CT) system for evaluation of major arteries of the head and neck compared with conventional single-energy CT scans using energy-integrating detectors (EIDs). METHODS: In this institutional review board-approved study, 16 asymptomatic subjects (7 men) provided informed consent and received both PCD and EID contrast-enhanced CT scans of the head and neck (mean age, 58 years; range, 46-75 years)...
September 18, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28926250/the-unimolecular-reactions-of-cf3chf2-studied-by-chemical-activation-assignment-of-rate-constants-and-threshold-energies-to-the-1-2-h-atom-transfer-1-1-hf-elimination-and-1-2-hf-elimination-reactions-and-the-dependence-of-threshold-energies-on-the-number-of
#8
Caleb A Smith, Blanton R Gillespie, George L Heard, Donald W Setser, Bert E Holmes
The recombination of CF3 and CHF2 radicals in a room temperature bath gas was used to prepare CF3CHF2* molecules with 101 kcal mol-1 of vibrational energy. The subsequent 1,2-H-atom transfer, 1,1-HF elimination and 1,2-HF elimination reactions were observed as a function of bath gas pressure by following the CHF3, CF3(F)C: and C2F4 product concentrations by gas chromatography using a mass spectrometer as the detector. The singlet CF3(F)C: concentration was measured by trapping the carbene with trans-2-butene...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28925490/multi-detector-spiral-ct-diagnosis-of-common-bile-duct-ampullary-carcinoma
#9
D-Z Zhao, Y Guo, Y-P Sun, H-M Liu, Z Zhang, Q-L Ma, Y-S Wang, C-L Chen
OBJECTIVE: The aim of this project was to study the imaging characteristics of multi-detector CT (MDCT) in different types of malignant tumor in the common bile duct ampulla. PATIENTS AND METHODS: We examined 30 cases of pancreatic head cancer, 35 of terminal cholangiocarcinoma, 26 of ampullary carcinoma, and 40 of benign lesions, all confirmed by pathology. We used 64-slice spiral CT plain scan and multi-phase enhanced scan with multi-planar reconstruction (MPR) and curved planar reconstruction (CPR) post-processing to obtain three-dimensional images...
August 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28924570/implementation-and-ct-sampling-characterization-of-a-third-generation-spect-ct-system-for-dedicated-breast-imaging
#10
Jainil P Shah, Steve D Mann, Randolph L McKinley, Martin P Tornai
Stand-alone cone beam computed tomography (CT) and single-photon emission computed tomography (SPECT) systems capable of complex acquisition trajectories have previously been developed for breast imaging. Fully three-dimensional (3-D) motions of SPECT systems provide views into the chest wall and throughout the entire volume. The polar tilting capability of the CBCT system has shown improvement in sampling close to the chest wall, while eliminating cone beam artifacts. Here, a single hybrid SPECT-CT system, with each individual modality capable of independently traversing complex trajectories around a common pendant breast volume, was developed...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28923792/p2y2-nucleotide-receptor-prompts-human-cardiac-progenitor-cell-activation-by-modulating-hippo-signaling
#11
Farid G Khalafalla, Steven R Greene, Hashim Khan, Kelli Ilves, Megan M Monsanto, Roberto Alvarez, Monica Chavarria, Jonathan H Nguyen, Benjamin Norman, Walter P Dembitsky, Mark A Sussman
Rationale: Autologous stem cell therapy using human c-Kit(+) cardiac progenitor cells (hCPCs) is a promising therapeutic approach for treatment of heart failure (HF). However, hCPCs derived from aged HF patients with genetic predispositions and/or comorbidities of chronic diseases exhibit poor proliferative and migratory capabilities, which impairs overall reparative potential for injured myocardium. Therefore, empowering functionally compromised hCPCs with pro-regenerative molecules ex vivo is crucial for improving the therapeutic outcome in HF patients...
September 18, 2017: Circulation Research
https://www.readbyqxmd.com/read/28923725/petroleum-degradation-by-endophytic-streptomyces-spp-isolated-from-plants-grown-in-contaminated-soil-of-southern-algeria
#12
Hafida Baoune, Aminata Ould El Hadj-Khelil, Graciela Pucci, Pedro Sineli, Lotfi Loucif, Marta Alejandra Polti
Petroleum hydrocarbons are well known by their high toxicity and recalcitrant properties. Their increasing utilization around worldwide led to environmental contamination. Phytoremediation using plant-associated microbe is an interesting approach for petroleum degradation and actinobacteria have a great potential for that. For this purpose, our study aimed to isolate, characterize, and assess the ability of endophytic actinobacteria to degrade crude petroleum, as well as to produce plant growth promoting traits...
September 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28923475/chemical-and-nano-mineralogical-study-for-determining-potential-uses-of-legal-colombian-gold-mine-sludge-experimental-evidence
#13
Nazly E Sánchez-Peña, José L Narváez-Semanate, Daniela Pabón-Patiño, Javier E Fernández-Mera, Marcos L S Oliveira, Kátia da Boit, Bernardo F Tutikian, Tito J Crissien, Diana C Pinto, Iván D Serrano, Claudia I Ayala, Ana L Duarte, José D Ruiz, Luis F O Silva
The present study is focused on the chemical and nano-mineralogical characterization of sludge from gold mine activities, in order to put forward diverse solution alternatives, where lack of knowledge has been found. The sample was collected from "La Estrella" mine of Suarez, located in Department of Cauca, south-west Colombia. The sludge micro-structure and chemical composition were analyzed using a high resolution transmission electron microscopy (HR-TEM) equipped with a dispersive X-ray detector (EDS). X-ray diffraction technique was employed to identify the mineralogical phases present in the sludge...
August 26, 2017: Chemosphere
https://www.readbyqxmd.com/read/28921931/technical-note-a-simple-algorithm-to-convert-epid-grey-values-into-absorbed-dose-to-water-without-prior-knowledge
#14
Christine Boutry, Aurélie Sors, Jimmy Fontaine, Nolwenn Delaby, Gregory Delpon
PURPOSE: Full integration of EPID-based dosimetry in a global quality control workflow is still complicated. All the actual solutions are based on a relation between image grey-level signal and total linac delivered dose. In this study, we propose a simple algorithm relying pixel grey-level of EPID image with average linac delivered dose per acquisition frame. METHODS: Calibration models are constructed for Varian and Elekta linacs including scattering conditions and EPID-arm backscatter specific corrections...
September 16, 2017: Medical Physics
https://www.readbyqxmd.com/read/28921606/dynamic-residual-pattern-of-azoxystrobin-in-swiss-chard-with-contribution-to-safety-evaluation
#15
Waziha Farha, A M Abd El-Aty, Md Musfiqur Rahman, Md Humayun Kabir, Hyung Suk Chung, Han Sol Lee, Jong-Sup Jeon, Jing Wang, Byung-Joon Chang, Ho-Chul Shin, Jae-Han Shim
This study aimed at quantifying the residual amount of azoxystrobin in Swiss chard samples grown under greenhouse conditions at 2 different locations (Gwangju and Naju, Republic of Korea). Samples were extracted with acetonitrile, separated by salting out, and subjected to purification by using solid-phase extraction (SPE). The analyte was identified using liquid chromatography (LC)-ultraviolet detector (UVD). The linearity of the calibration range was excellent with coefficient of determination (R(2) ) =1...
September 15, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28920111/interpretation-of-cone-beam-computed-tomography-volumetric-data-how-to-report-findings
#16
Mel Mupparapu, Adriana G Creanga, Steven R Singer
Cone beam computed tomography (CBCT) was introduced to the dental profession at the beginning of the new millennium and has become an integral part of dental practice, especially within the surgical specialties. With advances in technology and the introduction of new-generation digital detectors, the concomitant increase in pixel resolution provided the ability to discern fine details of the anatomy. This article focuses on the methodology of CBCT interpretation and reporting. Details of reviewing the volume thoroughly are described with relevant citations...
2017: Quintessence International
https://www.readbyqxmd.com/read/28919686/high-performance-liquid-chromatography-ultraviolet-photodiode-array-detection-method-for-aflatoxin-b1-in-cattle-feed-supplements
#17
Lazuardi Mochamad, Bambang Hermanto
AIM: The objective of the current study is to determine the concentration of aflatoxin B1 using high-performance liquid chromatography (HPLC) with a photodiode array (PDA) detector. MATERIALS AND METHODS: Aflatoxin B1 certified reference grade from Trilogy Analytical Laboratory dissolved acetonitrile (ACN) at 10 µg/mL was using standard assessment. HPLC instruments such as ultraviolet-PDA detector used a Shimadzu LC-6AD pump with DGU-20A5 degasser, communication module-20A, and PDA detector SPD-M20A with FRC-10A fraction collector...
August 2017: Veterinary World
https://www.readbyqxmd.com/read/28919282/impact-of-pancreaticoduodenal-arcade-dilation-on-postoperative-outcomes-after-pancreaticoduodenectomy
#18
Yusuke Nakayama, Motokazu Sugimoto, Tatsushi Kobayashi, Naoto Gotohda, Shinichiro Takahashi, Masahiko Kusumoto, Masaru Konishi
BACKGROUND: The aim of this study was to investigate the impact of pancreaticoduodenal arcade (PDA) dilation on postoperative outcomes after pancreaticoduodenectomy. METHODS: Consecutive patients submitted to pancreaticoduodenectomy between 2008 and 2016 underwent preoperative multi-detector computed tomography, the images of which were re-reviewed. The patients were categorized according to the grade of PDA dilation into 3 groups (remarkably-dilated, slightly-dilated, and non-dilated)...
September 14, 2017: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
https://www.readbyqxmd.com/read/28918975/activity-determination-of-67-ga-using-4%C3%AF-%C3%AE-%C3%A2-%C3%AE-coincidence-counting
#19
Ole Nähle
The activity of a (67)Ga solution was measured by means of the 4πβ-γ coincidence counting technique. A setup with a proportional counter and non-extending dead-time modules in the two detector channels was used. The influence of the delayed state affecting the measured count rates was taken into account by using appropriate correction formulae. The analysis requires a variation of the dead time and a subsequent extrapolation to infinite dead time. An uncertainty of about 0.5% was obtained and the result was used to make an intercomparison with the SIR of the BIPM...
September 7, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28917793/multi-elemental-nd-sm-eu-gd-isotope-ratio-measurements-by-stop-flow-isotachophoresis-coupled-to-mc-icpms
#20
L Vio, B Martelat, H Isnard, A Nonell, F Chartier
In this study, a new analytical procedure based on isotachophoresis (ITP) coupled to a multi collector inductively coupled plasma mass spectrometer named Stop-Flow-ITP-MC-ICPMS is developed for exhaustive and high-precision multi-elemental isotopic characterization. We demonstrate that Stop-Flow-ITP makes it possible to stop the analytes migration several times for a duration compatible with the detector configuration changes without losing the separation performance. With this procedure, isotope ratio measurements of four lanthanides of interest for nuclear applications (Nd, Sm, Eu and Gd) were obtained with a reproducibility better than 0...
January 1, 2018: Talanta
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