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Data Analytics

Bo Zhu, Jeremiah Z Liu, Stephen F Cauley, Bruce R Rosen, Matthew S Rosen
Image reconstruction is essential for imaging applications across the physical and life sciences, including optical and radar systems, magnetic resonance imaging, X-ray computed tomography, positron emission tomography, ultrasound imaging and radio astronomy. During image acquisition, the sensor encodes an intermediate representation of an object in the sensor domain, which is subsequently reconstructed into an image by an inversion of the encoding function. Image reconstruction is challenging because analytic knowledge of the exact inverse transform may not exist a priori, especially in the presence of sensor non-idealities and noise...
March 21, 2018: Nature
Bianca Abreu Dos Santos de Oliveira, Elenir Rose Jardim Cury Pontes, Teresa Cristina Abranches Rosa
INTRODUCTION: Patients in intensive care status are in nutritional threat and frequently present innutrition, therefore monitoring the nutritional offer becomes indispensable. AIM: To purpose a control and monitoring form of enteral nutritional therapy and to evaluate its resoluteness. METHODS: Observational, analytical and retrospective study performed in intensive care patients receiving an enteral diet exclusively and/or associated with the oral/parenteral route, from January to April 2015 and from January to April 2016...
January 10, 2018: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
Jiayuan Zhao, Jordan Nelson, Oluwabunmi Dada, Georgios Pyrgiotakis, Ilias G Kavouras, Philip Demokritou
Users of electronic cigarettes (e-cigs) are exposed to particles and other gaseous pollutants. However, major knowledge gaps on the physico-chemical properties of such exposures and contradictory data in published literature prohibit health risk assessment. Here, the effects of product brand, type, e-liquid flavoring additives, operational voltage, and user puffing patterns on emissions were systematically assessed using a recently developed, versatile, e-cig exposure generation platform and state-of-the-art analytical methods...
March 22, 2018: Inhalation Toxicology
Jiandong Wu, Juan Wei, John D Hogan, Pradeep Chopra, Apoorva Joshi, Weigang Lu, Joshua Klein, Geert-Jan Boons, Cheng Lin, Joseph Zaia
Among dissociation methods, negative electron transfer dissociation (NETD) has been proven the most useful for glycosaminoglycan (GAG) sequencing because it produces informative fragmentation, a low degree of sulfate losses, high sensitivity, and translatability to multiple instrument types. The challenge, however, is to distinguish positional sulfation. In particular, NETD has been reported to fail to differentiate 4-O- versus 6-O-sulfation in chondroitin sulfate decasaccharide. This raised the concern of whether NETD is able to differentiate the rare 3-O-sulfation from predominant 6-O-sulfation in heparan sulfate (HS) oligosaccharides...
March 21, 2018: Journal of the American Society for Mass Spectrometry
Torsten C Schmidt
Water analysis has been an important area since the beginning of analytical chemistry. The focus though has shifted substantially: from minerals and the main constituents of water in the time of Carl Remigius Fresenius to a multitude of, in particular, organic compounds at concentrations down to the sub-nanogram per liter level nowadays. This was possible only because of numerous innovations in instrumentation in recent decades, drivers of which are briefly discussed. In addition to the high demands on sensitivity, high throughput by automation and short analysis times are major requirements...
March 21, 2018: Analytical and Bioanalytical Chemistry
Sherwin K B Sy, Yen Lin Chia, Toufigh Gordi, Ute Hoch, Michael A Eldon
PURPOSE: Etirinotecan pegol (EP), a long-acting topoisomerase-1 inhibitor, is a polyethylene glycol conjugate of irinotecan, with an intended indication for treatment of breast cancer with brain metastases. The objective of this study was to develop a population pharmacokinetic (popPK) model of EP and four of its metabolites (irinotecan, SN38, SN38-glucuronide, and APC) and determine covariates affecting their pharmacokinetics. METHODS: Data from 83 cancer patients enrolled in phase 1 studies were used...
March 21, 2018: Cancer Chemotherapy and Pharmacology
U Hassan, R Zhu, R Bashir
Sepsis, as a leading cause of death worldwide, relies on systemic inflammatory response syndrome (SIRS) criteria for its diagnosis. SIRS is highly non-specific as it relies on monitoring of patients' vitals for sepsis diagnosis, which are known to change with many confounding factors. Changes in leukocyte counts and CD64 expression levels are known specific biomarkers of pro-inflammatory host response at the onset of sepsis. Recently, we have developed a biosensor chip that can enumerate the leukocyte counts and quantify the neutrophil CD64 expression levels from a drop of blood...
March 22, 2018: Lab on a Chip
Dheeraj Khetan, Rahul Katharia, Hem Chandra Pandey, Rajendra Chaudhary, Rajesh Harsvardhan, Hemchandra Pandey, Atul Sonkar
BACKGROUND: Blood transfusion chain can be divided into three phases: preanalytical (patient bedside), analytical (steps done at transfusion services), and postanalytical (bedside). Majority (~70%) of events due to blood transfusion have been attributed to errors in bedside blood administration practices. Survey of bedside transfusion practices (pre-analytical and post analytical phase) was done to assess awareness and compliance to guidelines regarding requisition and administration of blood components...
January 2018: Asian Journal of Transfusion Science
Michael Obermaier, Aliaksandr S Bandarenka, Cyrill Lohri-Tymozhynsky
Electrochemical impedance spectroscopy (EIS) is an indispensable tool for non-destructive operando characterization of Polymer Electrolyte Fuel Cells (PEFCs). However, in order to interpret the PEFC's impedance response and understand the phenomena revealed by EIS, numerous semi-empirical or purely empirical models are used. In this work, a relatively simple model for PEFC cathode catalyst layers in absence of oxygen has been developed, where all the equivalent circuit parameters have an entire physical meaning...
March 21, 2018: Scientific Reports
Hui Wang, Yanan Xu, Hongli Shi
PURPOSE: Metal artifacts severely degrade CT image quality in clinical diagnosis, which are difficult to removed, especially for the beam hardening artifacts. The metal artifact reduction (MAR) based on prior images are the most frequently-used methods. However, there exists a lot misclassification in most prior images caused by absence of prior information such as spectrum distribution of X-ray beam source, especially when multiple or big metal are included. This work aims is to identify a more accurate prior image to improve image quality...
March 15, 2018: Journal of X-ray Science and Technology
Xuelin Cui, Lamine Mili, Ge Wang, Hengyong Yu
Since their inceptions, the multimodal imaging techniques have received a great deal of attention for achieving enhanced imaging performance. In this work, a novel joint reconstruction framework using sparse computed tomography (CT) and magnetic resonance imaging (MRI) data is developed and evaluated. CT and MRI images are synchronously acquired and registered from a hybrid CT-MRI platform. Because image data are highly undersampled, analytic methods are unable to generate decent image quality. To overcome this drawback, we resort to the compressed sensing (CS) techniques, which employ sparse priors that result from an application of a wavelet transform...
March 15, 2018: Journal of X-ray Science and Technology
Martin Köhler, Christoph Neff, Camilo Perez, Cyrill Brunner, Els Pardon, Jan Steyaert, Gisbert Schneider, Kaspar P Locher, Renato Zenobi
The application of nanobodies as binding partners for structure stabilization in protein x-ray crystallography is taking an increasingly important role in structural biology. However, the addition of nanobodies to the crystallization matrices might complicate the optimization of the crystallization process, which is why analytical techniques to screen and characterize suitable nanobodies are useful. Here, we show how chemical cross-linking combined with high-mass matrix-assisted laser/desorption ionization mass spectrometry can be employed as a fast screening technique to determine binding specificities of intact nanobody•membrane protein complexes...
March 21, 2018: Analytical Chemistry
Cynthia de Jesus Freire, Lucas Roberto da Silva Barbosa, João Gomes da Costa, Renata Guerda de Araújo Santos, Aldenir Feitosa Dos Santos
OBJECTIVE: To demonstrate the use of phytotherapy as a therapy adopted in the context of Primary Care to Childhood. METHOD: Observational and analytical field research, with quantitative-qualitative approach. A semi-structured survey was used on socio-demographic and ethnopharmacological variables, audio interview and daily observation. RESULTS: The production of knowledge about phytotherapy constitutes a family heritage, but incorporated data resulting from the daily experiences shared by the community...
2018: Revista Brasileira de Enfermagem
Zihan Kan, Luliang Tang, Mei-Po Kwan, Xia Zhang
The energy consumption and emissions from vehicles adversely affect human health and urban sustainability. Analysis of GPS big data collected from vehicles can provide useful insights about the quantity and distribution of such energy consumption and emissions. Previous studies, which estimated fuel consumption/emissions from traffic based on GPS sampled data, have not sufficiently considered vehicle activities and may have led to erroneous estimations. By adopting the analytical construct of the space-time path in time geography, this study proposes methods that more accurately estimate and visualize vehicle energy consumption/emissions based on analysis of vehicles' mobile activities ( MA ) and stationary activities ( SA )...
March 21, 2018: International Journal of Environmental Research and Public Health
Batool Tirgari, Leili Mirshekari, Mansooreh Azzizadeh Forouzi
BACKGROUND: Pressure injuries are the third most expensive condition after cancer and cardiovascular disease. Nurses are responsible for the direct and continuous care, treatment, and prevention of pressure injuries. To achieve optimal quality care, nursing knowledge and attitudes must be based on the best scientific evidence. This study aimed to examine the knowledge and attitudes of nurses working in intensive care units of hospitals affiliated with Zahedan Medical Sciences University regarding the prevention of pressure injuries...
April 2018: Advances in Skin & Wound Care
Yunfang Jia, Fang Li
Functional nucleic acids (FNAs) are promising sensing elements, extensive interests are excited to integrate FNAs with transducers for biochemical assays. However, efforts for FNAs modified light-addressable-potentiometric-sensor (FNA-LAPS) are rarely reported. LAPS is a versatile transducer with electrolyte-insulator-semiconductor (EIS) structure, can respond almost any surface electronic deviations. Herein, organized studies for FNA-LAPS including experiments, theoretical derivations and MEDICI (Synopsys®) simulations, are presented using Pb2+ -DNAzyme GR-5 and Ag+ -aptamer as proof-of-concepts, which are typical FNAs with distinctive sensing strategies...
March 21, 2018: Analytical Chemistry
Saer Samanipour, Malcolm Reid, Kine Bæk, Kevin V Thomas
Non-target analysis is considered one of the most comprehensive tools for identification of unknown compounds in a complex sample analyzed via liquid chromatography coupled to high resolution mass spectrometry (LC-HRMS). Due to the complexity of the data generated via LC-HRMS, the data dependent acquisition mode, which produces the MS2 spectra of a limited number of the precursor ions, has been one of the most common approaches used during non-target screening. On the other hand, data independent acquisition mode produces highly complex spectra that require proper deconvolution and library search algorithms...
March 21, 2018: Environmental Science & Technology
Ben Buse, Stuart Kearns
Automated phase maps are an important tool for characterizing samples but the data quality must be evaluated. Common options include the overlay of phases on backscattered electron (BSE) images and phase composition averages and standard deviations. Both these methods have major limitations. We propose two methods of evaluation involving principal component analysis. First, a red-green-blue composite image of the first three principal components, which comprise the majority of the chemical variation, which provides a good reference against which phase maps can be compared...
March 21, 2018: Microscopy and Microanalysis
Hyun-Chae Jung, Byung-Kwon Moon, Jieun Wie
Recently, the surface ozone concentration in the Korean peninsula has been increasing more rapidly than in the past, and seasonal changes are appearing such as increases in the number of ozone alerts in springtime. We examined changes in the timing of annual maximum South Korean O3 levels by fitting a sine function to data from 54 air-quality monitoring sites over a 10-year period (2005-2014). The analytical results show that the date of maximum ozone concentration at 23 points in the last 10 years has been advanced by about 2...
January 2018: Heliyon
Mahnaz Solhi, Hanieh Jormand
Background: Health literacy is one of the major determinants of health promotion among individuals and within society. Objective: The present study is aimed to determine the health literacy status of office employees in Shemiranat using the native instruments of health literacy for Iranian adults (HELIA). Methods: The present descriptive-analytical cross-sectional study was done in 2016-17. It was conducted on 360 office employees in Shemiranat...
December 2017: Electronic Physician
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