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https://www.readbyqxmd.com/read/28651245/high-resolution-hyperpolarized-in-vivo-metabolic-13-c-spectroscopy-at-low-magnetic-field-48-7mt-following-murine-tail-vein-injection
#1
Aaron M Coffey, Matthew A Feldman, Roman V Shchepin, Danila A Barskiy, Milton L Truong, Wellington Pham, Eduard Y Chekmenev
High-resolution (13)C NMR spectroscopy of hyperpolarized succinate-1-(13)C-2,3-d2 is reported in vitro and in vivo using a clinical-scale, biplanar (80cm-gap) 48.7mT permanent magnet with a high homogeneity magnetic field. Non-localized (13)C NMR spectra were recorded at 0.52MHz resonance frequency over the torso of a tumor-bearing mouse every 2s. Hyperpolarized (13)C NMR signals with linewidths of ∼3Hz (corresponding to ∼6ppm) were recorded in vitro (2mL in a syringe) and in vivo (over a mouse torso). Comparison of the full width at half maximum (FWHM) for (13)C NMR spectra acquired at 48...
June 15, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28651216/ultra-sensitive-suspended-atomically-thin-layered-black-phosphorus-mercury-sensors
#2
Peng Li, Dongzhi Zhang, Chuanxing Jiang, Xiaoqi Zong, Yuhua Cao
The extraordinary properties of black phosphorus (BP) make it a promising candidate for next-generation transistor chemical sensors. However, BP films reported so far are supported on substrate, and substrate scattering drastically deteriorates its electrical properties. Consequentially, the potential sensing capability of intrinsic BP is highly underestimated and its sensing mechanism is masked. Additionally, the optimum sensing regime of BP remains unexplored. This article is the first demonstration of suspended BP sensor operated in subthreshold regime...
June 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28651206/an-investigation-of-the-role-of-defect-levels-on-the-radiation-response-of-synthetic-diamond-crystals-when-used-as-sensors-for-the-detection-of-mammography-x-rays
#3
Nicholas Ade
This study evaluates the role of defects on the performances of synthetic diamond sensors on exposure to mammography X-rays. Through systematic investigations, the main cause of instability of response of examined sensors necessitating pre-irradiation was isolated and ascribed to the presence of ambient light which has the effect of emptying shallow trapping levels. The changes in response between measurements in light and dark conditions varied from 2.8 ± 1.2% to 63.0 ± 0.3%. Sensitivities between 0.4 and 6...
June 17, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28651201/ex-situ-decoration-of-ordered-mesoporous-carbon-with-palladium-nanoparticles-via-polyoxometalates-and-for-sensitive-detection-of-acetaminophen-in-pharmaceutical-products
#4
Xiangyi Kong, Yeyu Wang, Qianqian Zhang, Tongrui Zhang, Qianqian Teng, Lei Wang, Huan Wang, Yufan Zhang
In this study, a facile and green method is described for decoration of ordered mesoporous carbon (OMC) with palladium nanoparticles (Pd NPs) through a polyoxometalates (POMs). Serving as both reducing and stabilizing agent, the Keggin-type POMs are used for synthesis of stable colloidal Pd NPs and then link them to the OMC at mild temperature. Current research focuses on the use of Pd-POMs-OMC as an effective sensing template for the detection of acetaminophen (AP) has been studied. Linear calibration curves in the range of 0...
June 20, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28651172/simultaneous-determination-of-cis-permethrin-and-trans-permethrin-in-rat-plasma-and-brain-tissue-using-gas-chromatography-negative-chemical-ionization-mass-spectrometry
#5
Shirin Hooshfar, Darren R Gullick, Michael R Linzey, Tanzir Mortuza, Mona Hamdy Abdel Rahman, Clinton A Rogers, James V Bruckner, Catherine A White, Michael G Bartlett
A sensitive method for the simultaneous determination of cis-permethrin (cis-PERM) and trans-permethrin (trans-PERM) in small volumes (100μL) of rat plasma and brain homogenate was developed, using a liquid-liquid extraction for sample preparation and gas chromatography-negative chemical ionization mass spectrometry (GCNCI-MS) for detection. Quantitation of trace levels of the insecticide in small volumes of biological samples is essential to support toxicokinetic studies in small animals. There are currently no validated methods in the literature for determining cis-PERM and trans- PERM in volumes as low as 100μL of rat plasma or brain homogenate...
June 13, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28651165/considering-common-sources-of-exposure-in-association-studies-urinary-benzophenone-3-and-dehp-metabolites-are-associated-with-altered-thyroid-hormone-balance-in-the-nhanes-2007-2008
#6
Sujin Kim, Sunmi Kim, Sungho Won, Kyungho Choi
Epidemiological studies have shown that thyroid hormone balances can be disrupted by chemical exposure. However, many association studies have often failed to consider multiple chemicals with possible common sources of exposure, rendering their conclusions less reliable. In the 2007-2008 National Health and Nutrition Examination Survey (NHANES) from the U.S.A., urinary levels of environmental phenols, parabens, and phthalate metabolites as well as serum thyroid hormones were measured in a general U.S. population (≥12years old, n=1829)...
June 23, 2017: Environment International
https://www.readbyqxmd.com/read/28651089/validation-of-commercial-real-time-pcr-arrays-for-environmental-risk-assessment-application-to-the-study-of-p-p%C3%A2-dde-toxicity-in-mus-spretus-mice-liver
#7
Noelia Morales-Prieto, Carmen Pueyo, Nieves Abril
Data on gene transcription profiles provide a comprehensive assessment of the toxic and defensive mechanisms that are triggered by pollutants. PCR-arrays have emerged as a reliable tool for analyzing the expression of a panel of relevant, pathway- or disease-focused genes under uniform cycling conditions. By using SYBR Green-optimized primer assays, it is possible to simultaneously amplify a sample with high specificity and amplification efficiencies. However, commercial PCR-arrays target a limited group of organisms, excluding most of those with environmental relevance, as is the case with Mus spretus mice...
June 23, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28651069/automatic-mpst-cut-for-segmentation-of-carpal-bones-from-mr-volumes
#8
Laura Gemme, Sonia Nardotto, Silvana G Dellepiane
In the context of rheumatic diseases, several studies suggest that Magnetic Resonance Imaging (MRI) allows the detection of the three main signs of Rheumatoid Arthritis (RA) at higher sensitivities than available through conventional radiology. The rapid, accurate segmentation of bones is an essential preliminary step for quantitative diagnosis, erosion evaluation, and multi-temporal data fusion. In the present paper, a new, semi-automatic, 3D graph-based segmentation method to extract carpal bone data is proposed...
June 12, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28650993/a-novel-potential-biomarker-for-metabolic-syndrome-in-chinese-adults-circulating-protein-disulfide-isomerase-family-a-member-4
#9
Chu-Yen Chien, Yi-Jen Hung, Yi-Shing Shieh, Chang-Hsun Hsieh, Chieh-Hua Lu, Fu-Huang Lin, Sheng-Chiang Su, Chien-Hsing Lee
BACKGROUND/OBJECTIVES: Protein disulfide isomerase (PDI) family members are specific endoplasmic reticulum proteins that are involved in the pathogenesis of numerous diseases including neurodegenerative diseases, cancer and obesity. However, the metabolic effects of PDIA4 remain unclear in humans. The aims of this study were to investigate the associations of serum PDIA4 with the metabolic syndrome (MetS) and its components in Chinese adults. SUBJECTS/METHODS: A total of 669 adults (399 men and 270 women) were recruited...
2017: PloS One
https://www.readbyqxmd.com/read/28650987/accuracy-of-zika-virus-disease-case-definition-during-simultaneous-dengue-and-chikungunya-epidemics
#10
José Ueleres Braga, Clarisse Bressan, Ana Paula Razal Dalvi, Guilherme Amaral Calvet, Regina Paiva Daumas, Nadia Rodrigues, Mayumi Wakimoto, Rita Maria Ribeiro Nogueira, Karin Nielsen-Saines, Carlos Brito, Ana Maria Bispo de Filippis, Patrícia Brasil
BACKGROUND: Zika is a new disease in the American continent and its surveillance is of utmost importance, especially because of its ability to cause neurological manifestations as Guillain-Barré syndrome and serious congenital malformations through vertical transmission. The detection of suspected cases by the surveillance system depends on the case definition adopted. As the laboratory diagnosis of Zika infection still relies on the use of expensive and complex molecular techniques with low sensitivity due to a narrow window of detection, most suspected cases are not confirmed by laboratory tests, mainly reserved for pregnant women and newborns...
2017: PloS One
https://www.readbyqxmd.com/read/28650970/point-of-care-testing-for-toxoplasma-gondii-igg-igm-using-toxoplasma-ict-igg-igm-test-with-sera-from-the-united-states-and-implications-for-developing-countries
#11
Ian J Begeman, Joseph Lykins, Ying Zhou, Bo Shiun Lai, Pauline Levigne, Kamal El Bissati, Kenneth Boyer, Shawn Withers, Fatima Clouser, A Gwendolyn Noble, Peter Rabiah, Charles N Swisher, Peter T Heydemann, Despina G Contopoulos-Ioannidis, Jose G Montoya, Yvonne Maldonado, Raymund Ramirez, Cindy Press, Eileen Stillwaggon, François Peyron, Rima McLeod
BACKGROUND: Congenital toxoplasmosis is a serious but preventable and treatable disease. Gestational screening facilitates early detection and treatment of primary acquisition. Thus, fetal infection can be promptly diagnosed and treated and outcomes can be improved. METHODS: We tested 180 sera with the Toxoplasma ICT IgG-IgM point-of-care (POC) test. Sera were from 116 chronically infected persons (48 serotype II; 14 serotype I-III; 25 serotype I-IIIa; 28 serotype Atypical, haplogroup 12; 1 not typed)...
June 26, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28650900/a-high-throughput-hplc-ms-ms-assay-for-the-detection-quantification-and-simultaneous-structural-confirmation-of-136-drugs-and-metabolites-in-human-urine
#12
Jacek Klepacki, Baharak Davari, Marion Boulet, Ryan Lizarraga, Uwe Christians
BACKGROUND: Due to its superior sensitivity and specificity, multi-analyte high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS) has become the gold standard in clinical toxicology. Although several qualitative and quantitative LC-MS/MS assays on various mass spectrometry platforms have been described in the literature, the majority of these methods either analyze only a limited number of compounds, and/or require tedious and time-consuming sample preparation...
June 22, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28650882/diagnostic-utility-of-intraoperative-neurophysiological-monitoring-for-intramedullary-spinal-cord-tumors-systematic-review-and-meta-analysis
#13
Tej D Azad, Arjun V Pendharkar, Viet Nguyen, James Pan, Ian D Connolly, Anand Veeravagu, Rita Popat, John K Ratliff, Gerald A Grant
STUDY DESIGN: Systematic review and meta-analysis. OBJECTIVE: The aim of this study was to systematically evaluate the diagnostic utility of intraoperative neurophysiological monitoring (IONM) for detecting postoperative injury in resection of intramedullary spinal cord tumors (IMSCT). SUMMARY OF BACKGROUND DATA: Surgical management of IMSCT can involve key neurological and vascular structures. IONM aims to assess the functional integrity of susceptible elements in real time...
June 23, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28650850/systemic-aminoglycosides-induced-vestibulotoxicity-in-humans
#14
Ruth Van Hecke, Vincent Van Rompaey, Floris L Wuyts, Laura Leyssens, Leen Maes
OBJECTIVES: This systematic review aimed to investigate the prevalence and characteristics of vestibular adverse effects of aminoglycoside (AG) therapy in humans and to analyze objective vestibular tests for the detection of AG-induced vestibulotoxicity. DESIGN: PubMed, Cochrane Database, Web of Science, and reference lists of all included studies were screened by two independent researchers. The Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines were followed...
June 23, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28650717/heart-type-fatty-acid-binding-protein-is-a-sensitive-biomarker-for-early-ami-detection-in-troponin-negative-patients-a-pilot-study
#15
Luisa Agnello, Giulia Bivona, Giuseppina Novo, Concetta Scazzone, Roberto Muratore, Piero Levantino, Chiara Bellia, Bruna Lo Sasso, Marcello Ciaccio
BACKGROUND: Early detecting AMI in individuals presenting to the ED with chest pain continues to be a challenge. cTn is the gold standard for AMI diagnosis but early presenters (<1 hours from symptom onset) maybe cTn negative on admission. We analysed the diagnostic value of h-FABP and hs-TnI in patients presenting to ED with chest pain and no cTnI elevations. METHODS: 28 AMI and 28 no-AMI individuals both presented to ED within one hour from pain onset were included...
June 26, 2017: Scandinavian Journal of Clinical and Laboratory Investigation
https://www.readbyqxmd.com/read/28650611/integrating-target-responsive-hydrogel-with-pressuremeter-readout-enables-simple-sensitive-user-friendly-quantitative-point-of-care-testing
#16
Dan Liu, Shasha Jia, Huimin Zhang, Yanli Ma, Zhichao Guan, Jiuxing Li, Zhi Zhu, Tianhai Ji, Chaoyong James Yang
Point-of-care testing (POCT) with the advantages of speed, simplicity, and low cost, as well as no need for instrumentation is critical for the measurement of analytes in a variety of environments lacking access to laboratory infrastructure. In the present study, a hydrogel pressure-based assay for quantitative POCT was developed by integrating a target-responsive hydrogel with pressuremeter readout. The target-responsive hydrogels were constructed with DNA grafted linear polyacrylamide and the crosslinking DNA for selective target recognition...
June 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28650607/self-diffusion-driven-ultrafast-detection-of-ppm-level-nitro-aromatic-pollutants-in-aqueous-media-using-a-hydrophilic-fluorescent-paper-sensor
#17
Wei Lu, Jiawei Zhang, Youju Huang, Patrick Theato, Qing Huang, Tao Chen
Development of fluorescent film probes for toxic nitro aromatic compound pollutants (NACs) such as 2,4,6-trinitrotoluene (TNT) in real water samples implies broad applications in environmental and industrial safety control. Despite many recent advances, there are still some difficult challenges facing this area, e.g., the restricted sensitivity and long response time caused by hindered and slow diffusion of aqueous NACs samples inside a dense, solid film. Hence, we report herein a robust fluorescent paper sensor with improved sensing abilities, which is prepared by absorbing hydrophilic pyrene-functionalized polymer uniformly into cellulose-based filter papers...
June 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28650536/surveillance-for-lung-metastasis-from-giant-cell-tumor-of-bone
#18
Mamer Rosario, Han-Soo Kim, Ji Yeon Yun, Ilkyu Han
BACKGROUND AND OBJECTIVES: Literature on surveillance for lung metastasis from giant cell tumor of bone (GCTB) is scarce. We aimed to develop one by determining: (1) the optimal surveillance schedule by analyzing time-to-event data, taking into account the predictive factors, and (2) the effective diagnostic modality. METHODS: A total of 333 patients who underwent surgery for GCTB were followed for at least 2 years. All had chest radiography, and 169 had additional CT for surveillance...
June 26, 2017: Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28650504/experimental-and-theoretical-studies-on-fluvastatin-primary-photoproduct-formation
#19
Dorota Jarmużek, Tomasz Pedzinski, Marcin Hoffmann, Tomasz Siodła, Kinga Salus, Donata Pluskota-Karwatka
Fluvastatin (FLV) belongs to the group of compounds referred to as statins, also known as 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase inhibitors. Statins act as cholesterol-lowering agents and are among the most frequently prescribed drugs. They upregulate low-density lipoprotein receptors in the liver by binding to the active site of HMG-CoA reductase, which is the key enzyme in cholesterol biosynthesis. Statins have been detected as contaminants in natural waters and are susceptible to degradation upon exposure to light...
June 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28650467/genome-wide-loss-of-function-genetic-screening-identifies-opioid-receptor-%C3%AE-1-as-a-key-regulator-of-l-asparaginase-resistance-in-pediatric-acute-lymphoblastic-leukemia
#20
S M Kang, J L Rosales, V Meier-Stephenson, S Kim, K Y Lee, A Narendran
L-asparaginase is a critical chemotherapeutic agent for acute lymphoblastic leukemia (ALL). It hydrolyzes plasma asparagine into aspartate and NH3, causing asparagine deficit and inhibition of protein synthesis and eventually, leukemic cell death. However, patient relapse often occurs due to development of resistance. The molecular mechanism by which ALL cells acquire resistance to L-asparaginase is unknown. Therefore, we sought to identify genes that are involved in L-asparaginase resistance in primary leukemic cells...
June 26, 2017: Oncogene
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