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TOF Ratio

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https://www.readbyqxmd.com/read/28109887/compressed-sensing-based-simultaneous-black-and-gray-blood-carotid-vessel-wall-mr-imaging
#1
Bo Li, Hao Li, Hanjing Kong, Li Dong, Jue Zhang, Jing Fang
OBJECTIVE: In this study, we sought to demonstrate the blood suppression performance, image quality and morphological measurements for compressed sensing (CS) based simultaneous 3D black- and gray-blood imaging sequence (CS-siBLAG) in carotid vessel wall MR imaging. MATERIALS AND METHODS: Seven healthy volunteers and five patients were recruited. Healthy subjects underwent five CS-siBLAG scans with 1, 2, 3, 4 and 5-fold accelerations. Signal-to-tissue ratio (STR) and contrast-to-tissue ratios (CTR) were computed as the measures of flowing signal suppression performance and the image quality for black-blood imaging of the technique...
January 18, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28103484/reiterative-deconvolution-new-technique-for-time-of-flight-estimation-errors-reduction-in-case-of-close-proximity-of-two-reflections
#2
Linas Svilainis, Kristina Lukoseviciute, Dobilas Liaukonis
ToF estimation errors for two reflections have been analyzed. Case of high signal-to-noise ratio was assumed, when accuracy of the order of few nanoseconds can be achieved. It was indicated that additional bias errors are introduced in ToF estimator when other reflection is in close temporal proximity to the reflection of interest. Research demonstrates that iterative deconvolution does not improve the accuracy significantly. Novel technique is suggested which addresses this issue by means of a reiterative deconvolution...
January 7, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28043462/right-ventricular-outflow-tract-reconstruction-with-a-polytetrafluoroethylene-monocusp-valve-a-20-year-experience
#3
Mohineesh Kumar, Mark W Turrentine, Mark D Rodefeld, Teresa Bell, John W Brown
In patients with tetralogy of Fallot (TOF), pulmonary atresia (PA), and other congenital right ventricular outflow tract (RVOT) malformations, polytetrafluoroethylene (PTFE) monocusp outflow tract patches (MOTP) relieve obstruction and provide pulmonary valve competence. The purpose of this study was to determine whether our PTFE-MOTP was an acceptable short- and mid-term remedy for patients with TOF or PA as assessed by freedom from severe pulmonary regurgitation and freedom from reoperation. From 1994-2014, 171 patients (mean age 1...
July 2016: Seminars in Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28030444/impact-of-reversal-strategies-on-the-incidence-of-postoperative-residual-paralysis-after-rocuronium-relaxation-without-neuromuscular-monitoring-a-partially-randomised-placebo-controlled-trial
#4
Réka Nemes, Béla Fülesdi, Adrienn Pongrácz, László Asztalos, Zoltán Szabó-Maák, Szabolcs Lengyel, Edömér Tassonyi
BACKGROUND: Electronic neuromuscular monitoring is not widely used to determine either the reversal requirements for neuromuscular block before extubation of the trachea, or to determine if there is any subsequent postoperative residual neuromuscular block (PORNB). OBJECTIVES: To investigate the incidence of PORNB using acceleromyography after spontaneous recovery of rocuronium-induced block and to compare this with the administration of sugammadex, neostigmine or a placebo...
December 26, 2016: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/28010777/hypersensitive-antibiotic-susceptibility-test-based-on-a-%C3%AE-lactamase-assay-with-a-parylene-matrix-chip
#5
Jong-Min Park, Jo-Il Kim, Joo-Yoon Noh, Mira Kim, Min-Jung Kang, Jae-Chul Pyun
Many kinds of susceptibility test for β-lactam antibiotics have been used to determine the antibiotic resistance of bacterial strains. Here, a sensitive antibiotic susceptibility test was presented by using a specialized reaction tool for laser desorption/ionization time-of-flight mass spectrometry (LDI-TOF MS) based on parylene-matrix chip. The β-lactamase assay was carried out in a specialized reaction tool by (1) concentrating the bacterial strain and (2) incubating the bacteria with penicillin-G. The parylene-matrix chip was produced by deposition of a partially porous parylene-N thin film on a dried organic matrix array, and the products of β-lactamase reaction in the low range of mass-to-charge ratio (m/z<500) could be effectively analyzed by using a parylene-matrix chip...
February 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28008374/comparative-proteomics-analysis-of-human-osteosarcoma-by-2d-dige-with-maldi-tof-tof-ms
#6
Guoxiang Wang, Zhengyao Zhang, Maoguang Yang, Bo Xu, Qi Gao, Xiaoyu Yang
Osteosarcoma (OS) is the most common primary malignant tumor of bone and the third most common cancer in childhood and adolescence. However, controversy concerning the ideal combination of chemotherapy agents ensued throughout the last quarter of the 20th century because of conflicting and often nonrandomized data. Collaborative efforts to increase understanding of the biology of osteosarcoma and the use of preclinical models to test novel protein targets will be critical to identify the path toward improving outcomes for patients...
November 2016: Journal of Bone Oncology
https://www.readbyqxmd.com/read/28006886/neuromuscular-effect-of-dexmedetomidine-on-sevoflurane-an-open-label-dose-escalation-clinical-trial
#7
Hui H Ke, Huang H Wu, Qi Zhu, Yan Zhang, Jin R Xiao, Xiu Z Su, Wan J Zheng, Yu P Cai, Xiao Z Wu, Yu T Wang, Guo Z Chen
BACKGROUND: Sevoflurane presents reliable central neuromuscular effects. However, little knowledge is available regarding the interaction between sevoflurane and demedetomidine. We evaluated the neuromuscular effect of dexmedetomidine on sevoflurane in patients with normal neuromuscular transmission and calculated the 50% effective concentration (EC50). METHODS: One-hundred and forty-four ASA grade I~II patients with normal neuromuscular transmission, aged 20~60 years old, undergoing lower limbs surgery were enrolled in this open- label, dose-escalation clinical trial...
December 22, 2016: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28000124/lead-isotope-ratios-in-lichen-samples-evaluated-by-icp-tof-ms-to-assess-possible-atmospheric-pollution-sources-in-havana-cuba
#8
Alfredo Montero Alvarez, Juan R Estévez Alvarez, Clístenes Williams Araújo do Nascimento, Iván Pupo González, Oscar Díaz Rizo, Lázaro Lima Carzola, Roberto Ayllón Torres, Jorge Gómez Pascual
Epiphytic lichens, collected from 119 sampling sites grown over "Roistonea Royal Palm" trees, were used to assess the spatial distribution pattern of lead (Pb) and identify possible pollution sources in Havana (Cuba). Lead concentrations in lichens and topsoils were determined by flame atomic absorption spectrophotometry and inductively coupled plasma (ICP) atomic emission spectrometry, respectively, while Pb in crude oils and gasoline samples were measured by ICP-time of flight mass spectrometry (ICP-ToF-MS)...
January 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27997765/intracellular-cho-cell-metabolite-profiling-reveals-steady-state-dependent-metabolic-fingerprints-in-perfusion-culture
#9
Daniel J Karst, Robert Steinhoff, Marie R G Kopp, Elisa Serra, Miroslav Soos, Renato Zenobi, Massimo Morbidelli
Perfusion cell culture processes allow the steady-state culture of mammalian cells at high viable cell density, which is beneficial for overall product yields and homogeneity of product quality in the manufacturing of therapeutic proteins. In this study, the extent of metabolic steady state and the change of the metabolite profile between different steady states of an industrial Chinese hamster ovary (CHO) cell line producing a monoclonal antibody (mAb) was investigated in stirred tank perfusion bioreactors...
December 20, 2016: Biotechnology Progress
https://www.readbyqxmd.com/read/27996238/latitudinal-and-seasonal-distribution-of-particulate-msa-over-the-atlantic-using-a-validated-quantification-method-with-hr-tof-ams
#10
Shan Huang, Laurent Poulain, Dominik van Pinxteren, Manuela van Pinxteren, Zhijun Wu, Hartmut Herrmann, Alfred Wiedensohler
Methanesulfonic acid (MSA) has been widely used as a proxy for marine biogenic sources, but it is still a challenge to provide an accurate MSA mass concentration with high time resolution. This study offers an improved MSA quantification method using high resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS). Particularly, the method was validated based on an excellent agreement with parallel offline measurements (slope = 0.88, R(2) = 0.89). This comparison is much better than those using previously reported methods, resulting in underestimations of 31-54% of MSA concentration...
January 3, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/27974108/-screening-and-identification-of-apolipoprotein-a-i-as-a-potential-marker-for-hepatoblastoma-in-children
#11
Li-Hua Guo, Wei Zhao, Jun-Jie Zhang, Qian Zhang, Ying-Zhong Fan, Jia-Xiang Wang
OBJECTIVE: To screen and identify serum biomarkers for childhood hepatoblastoma (HB). METHODS: The serum samples from 30 children with hepatoblastoma (HB), 20 children with systemic inflammatory response syndrome, and 20 normal children were treated with magnetic bead-based weak cation exchange chromatography. The platform of surface-enhanced laser desorption/ionization-time of flight-mass spectrometry (SELDI-TOF-MS) was used to eliminate the interference of inflammatory factors and to screen out the differentially expressed proteins in serum between tumor group and normal group...
December 2016: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/27968711/evaluation-of-capillary-electrophoresis-mass-spectrometry-for-the-analysis-of-the-conformational-heterogeneity-of-intact-proteins-using-beta2-microglobulin-as-model-compound
#12
Laura Bertoletti, Julie Schappler, Raffaella Colombo, Serge Rudaz, Rob Haselberg, Elena Domínguez-Vega, Sara Raimondi, Govert W Somsen, Ersilia De Lorenzi
In this work we explored the feasibility of different CE-ESI-MS set-ups for the analysis of conformational states of an intact protein. By using the same background electrolyte at quasi physiological conditions (50 mM ammonium bicarbonate, pH 7.4) a sequential optimization was carried out, initially by evaluating a sheath-liquid interface with both a single quadrupole (SQ) and a time-of-flight (TOF) mass spectrometer; then a sheathless interface coupled with high-resolution QTOF MS was considered. Beta2-microglobulin has been taken as a model, as it is an amyloidogenic protein and its conformational changes are strictly connected to the onset of a disease...
November 16, 2016: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27966270/comparison-of-targeted-proteomics-approaches-for-detecting-and-quantifying-proteins-derived-from-human-cancer-tissues
#13
Jakub Faktor, Rita Suchá, Vendula Páralová, Yansheng Liu, Pavel Bouchal
Targeted mass spectrometry-based proteomics approaches enable the simultaneous and reproducible quantification of multiple protein analytes across numerous conditions in biology and clinical studies. These approaches involve e.g. selected reaction monitoring (SRM) typically conducted on a triple quadrupole mass spectrometer, its high-resolution variant named pseudo-SRM (p-SRM), carried out in a quadrupole coupled with an TOF analyser (qTOF), and "sequential window acquisition of all theoretical spectra" (SWATH)...
December 14, 2016: Proteomics
https://www.readbyqxmd.com/read/27940912/kinetic-isotope-effects-reveal-early-transition-state-of-protein-lysine-methyltransferase-set8
#14
Joshua A Linscott, Kanishk Kapilashrami, Zhen Wang, Chamara Senevirathne, Ian R Bothwell, Gil Blum, Minkui Luo
Protein lysine methyltransferases (PKMTs) catalyze the methylation of protein substrates, and their dysregulation has been linked to many diseases, including cancer. Accumulated evidence suggests that the reaction path of PKMT-catalyzed methylation consists of the formation of a cofactor(cosubstrate)-PKMT-substrate complex, lysine deprotonation through dynamic water channels, and a nucleophilic substitution (SN2) transition state for transmethylation. However, the molecular characters of the proposed process remain to be elucidated experimentally...
December 27, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27933719/depth-profiling-cross-linked-poly-methyl-methacrylate-films-a-tof-sims-approach
#15
Soheila Naderi-Gohar, Kevin M H Huang, Yiliang Wu, Woon Ming Lau, Heng-Yong Nie
RATIONALE: In order to determine the degree of cross-linking on the surface and its variations in a nanometer-scale depth of organic materials, we developed an approach based on time-of-flight secondary ion mass spectrometry (TOF-SIMS), which provides rich chemical information in the form of fragment ions. TOF-SIMS is extremely surface sensitive and capable of depth profiling with the use of a sputter ion beam to remove controllable amounts of substance. METHODS: Poly(methyl methacrylate) (PMMA) films spin-coated on a Si substrate were cross-linked using a recently developed, surface sensitive, hyperthermal hydrogen projectile bombardment technique...
December 9, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/27896349/silver-nanoparticles-a-mechanism-of-action-on-moulds
#16
Katarzyna Pietrzak, Sława Glińska, Magdalena Gapińska, Tomasz Ruman, Adriana Nowak, Egemen Aydin, Beata Gutarowska
Silver nanoparticles (AgNPs) are widely used in all branches of industry. However, their mechanisms of action towards moulds have not been studied yet. Thus we conducted this study in which we have used laser desorption/ionization time-of-flight mass spectrometry (LDI-ToF-MS) analysis to determine metabolomic changes, and microscopic analysis (transmission electron microscopy, fluorescent microscopy) to observe changes in mould cells. The AgNP treatment caused the downregulation of 162 (15 ppm) and 284 (62 ppm), and 19 (15 ppm) and 29 (62 ppm) metabolites of Aspergillus niger and Penicillium chrysogenum, respectively...
December 7, 2016: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/27878405/a-comparison-study-between-3d-t2-weighted-space-and-conventional-2d-t2-weighted-turbo-spin-echo-in-assessment-of-carotid-plaque
#17
Peng Lv, Yuanyuan Dai, Jiang Lin, Weisheng Zhang, Hao Liu, Hui Liu, Xiao Tang
The aim of this study was to compare 3D T2-weighted sampling perfection with application optimized contrast using different flip angle evolutions (T2w SPACE) with conventional 2D T2w turbo-spin echo (TSE) in plaque imaging of carotid artery. 45 patients underwent 3.0-T MRI for carotid arteries imaging. MR sequences included T2w SPACE, T2w TSE, Time of flight (TOF) and T1-weighted (T1w) TSE. The signal intensity of intra-plaque hemorrhage (IPH), lipid-rich necrotic core (LRNC), and loose matrix (LM) were measured and their contrast ratios (CRs) against adjacent muscle were calculated...
November 22, 2016: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/27871583/sugammadex-given-for-rocuronium-induced-neuromuscular-blockade-in-infants-a-retrospect%C3%A4-ve-study
#18
Ozlem Ozmete, Cagla Bali, Oya Yalcin Cok, Hatice Evren Eker Turk, Nesrın Bozdogan Ozyilkan, Soner Civi, Anıs Aribogan
STUDY OBJECTIVE: To evaluate the efficacy and safety of sugammadex in reversing profound neuromuscular block induced by rocuronium in infant patients. DESIGN: Retrospective observational study. SETTING: University teaching hospital. PATIENTS: Twenty-six infants (2-12 months of age; 3-11 kg) with an American Society of Anesthesiologists classification I, II, or III who were scheduled to undergo neurosurgical procedures were included in the study...
December 2016: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/27871520/cisatracurium-and-rocuronium-associated-residual-neuromuscular-dysfunction-under-intraoperative-neuromuscular-monitoring-and-postoperative-neostigmine-reversal-a-single-blind-randomized-trial
#19
Paolo Feltracco, Tommaso Tonetti, Stefania Barbieri, Anna Chiara Frigo, Carlo Ori
BACKGROUND: Postoperative residual neuromuscular blockade (RNMB) is a common complication in the postanesthesia care unit (PACU), but also one of the most controversial issues. Many studies and trials demonstrated that some methods and techniques can reduce the incidence and the extent of the phenomenon. STUDY OBJECTIVE: To determine the incidence of RNMB in the PACU at standardized times after extubation with the implementation of a protocol of careful neuromuscular blockade management...
December 2016: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/27866031/aortopathy-in-adults-with-tetralogy-of-fallot-has-a-negative-impact-on-the-left-ventricle
#20
Yumi Shiina, Tomoaki Murakami, Naoto Kawamatsu, Koichiro Niwa
BACKGROUND: Aortic pressure wave reflection is significantly elevated in patients with congenital heart disease, even in children. Excessive aortic pressure wave reflection provokes cardiovascular events. AIM: To assess the influences of the enhanced pressure wave reflection on the left ventricle (LV) in adults with repaired tetralogy of Fallot (TOF). METHODS: Prospectively, 51 consecutive adults with repaired TOF (35.5±11.6yrs., 25 males) were enrolled and non-invasively assessed the pressure wave reflection using HEM 9000AI...
February 1, 2017: International Journal of Cardiology
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