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https://www.readbyqxmd.com/read/28445849/a-reference-measurement-procedure-for-amino-acids-in-blood-using-isotope-dilution-ultra-performance-liquid-chromatography-tandem-mass-spectrometry
#1
Juok Kim, Tran Thi Thanh Huong, Seon-Pyo Hong, Ji-Seon Jeong
We described a reference measurement procedure for amino acid (AA) quantification in blood samples based on deproteinization with 5-sulfosalicylic acid (SSA) and an isotope dilution-ultra performance liquid chromatography-tandem mass spectrometry (LC-MS) method. The serum was deproteinized with 15% v/v SSA and the supernatant was injected directly into the LC-MS system without further processing. Compared with the use of other precipitants and water as a control, five model AAs-valine, isoleucine, leucine, tyrosine, and phenylalanine-in the SSA-treated samples showed ionization enhancement as well as stable background signals without significant ion suppression effects...
April 17, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28445682/atrial-fibrillation-diagnostic-accuracy-of-coronary-ct-angiography-performed-with-a-whole-heart-230-%C3%A2%C2%B5m-spatial-resolution-ct-scanner
#2
Daniele Andreini, Gianluca Pontone, Saima Mushtaq, Edoardo Conte, Marco Perchinunno, Marco Guglielmo, Valentina Volpato, Andrea Annoni, Andrea Baggiano, Alberto Formenti, Maria Elisabetta Mancini, Virginia Beltrama, Valentina Ditali, Alessandro Campari, Cesare Fiorentini, Antonio L Bartorelli, Mauro Pepi
Purpose To assess image quality, interpretability, diagnostic accuracy, and radiation exposure of a computed tomography (CT) scanner with 16-cm coverage and 230-µm spatial resolution at coronary artery evaluation in patients with atrial fibrillation (AF) by using invasive coronary angiography (ICA) as the reference method and to compare the results with those obtained in patients with sinus rhythm (SR). Materials and Methods Written informed consent and institutional ethics committee approval were obtained...
April 26, 2017: Radiology
https://www.readbyqxmd.com/read/28444965/serum-free-light-chain-quantitative-assays-dilemma-of-a-biomarker
#3
Giovanni Cigliana, Francesca Gulli, Cecilia Napodano, Krizia Pocino, Elena De Santis, Luigi Colacicco, Iole Cordone, Laura Conti, Umberto Basile
BACKGROUND: Serum free light chains detection assays are consistently meeting greater interest for the diagnosis and monitoring of monoclonal gammopathies and plasma cell dyscrasias. Nowadays, there are neither standardized methods nor reference material for the determination of free light chains; for this reason, it is important to compare two different assays used in clinical laboratory. METHODS: We evaluated 300 serum samples from patients with B-cell disorders and compared the analytical performances of both assay...
April 26, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/28444761/photon-counting-ct-for-simultaneous-imaging-of-multiple-contrast-agents-in-the-abdomen-an-in-vivo-study
#4
Rolf Symons, Bernhard Krauss, Pooyan Sahbaee, Tyler E Cork, Manu N Lakshmanan, David A Bluemke, Amir Pourmorteza
PURPOSE: To demonstrate the feasibility of spectral imaging using photon-counting detector (PCD) x-ray computed tomography (CT) for simultaneous material decomposition of 3 contrast agents in vivo in a large animal model. METHODS: This Institutional Animal Care and Use Committee-approved study used a canine model. Bismuth subsalicylate was administered orally 24-72 hours before imaging. PCD CT was performed during intravenous administration of 40-60 ml gadoterate meglumine; 3...
April 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28444161/odor-perception-by-dogs-evaluating-two-training-approaches-for-odor-learning-of-sniffer-dogs
#5
Carola Fischer-Tenhagen, Dorothea Johnen, Wolfgang Heuwieser, Roland Becker, Kristin Schallschmidt, Irene Nehls
In this study, a standardized experimental set-up with various combinations of herbs as odor sources was designed. Two training approaches for sniffer dogs were compared; first, training with a pure reference odor, and second, training with a variety of odor mixtures with the target odor as a common denominator. The ability of the dogs to identify the target odor in a new context was tested. Six different herbs (basil, St. John's wort, dandelion, marjoram, parsley, ribwort) were chosen to produce reference materials in various mixtures with (positive) and without (negative) chamomile as the target odor source...
April 21, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28442713/a-self-consistent-spin-diffusion-model-for-micromagnetics
#6
Claas Abert, Michele Ruggeri, Florian Bruckner, Christoph Vogler, Aurelien Manchon, Dirk Praetorius, Dieter Suess
We propose a three-dimensional micromagnetic model that dynamically solves the Landau-Lifshitz-Gilbert equation coupled to the full spin-diffusion equation. In contrast to previous methods, we solve for the magnetization dynamics and the electric potential in a self-consistent fashion. This treatment allows for an accurate description of magnetization dependent resistance changes. Moreover, the presented algorithm describes both spin accumulation due to smooth magnetization transitions and due to material interfaces as in multilayer structures...
December 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28441938/mitors-a-method-for-high-throughput-sensitive-and-accurate-detection-of-mitochondrial-dna-heteroplasmy
#7
Julien Marquis, Gregory Lefebvre, Yiannis A I Kourmpetis, Mohamed Kassam, Frédéric Ronga, Umberto De Marchi, Andreas Wiederkehr, Patrick Descombes
BACKGROUND: Mitochondrial dysfunction is linked to numerous pathological states, in particular related to metabolism, brain health and ageing. Nuclear encoded gene polymorphisms implicated in mitochondrial functions can be analyzed in the context of classical genome wide association studies. By contrast, mitochondrial DNA (mtDNA) variants are more challenging to identify and analyze for several reasons. First, contrary to the diploid nuclear genome, each cell carries several hundred copies of the circular mitochondrial genome...
April 26, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28441705/oral-complications-of-the-oromaxillofacial-area-radiotherapy
#8
Hakimeh Ahadian, Soghra Yassaei, Fathollah Bouzarjomehri, Mehrdad Ghaffari Targhi, Khatereh Kheirollahi
Background: The incidence of malignancies is on the rise in different communities, making them the second most important cause of mortality in developed countries. One of the treatment modalities for these malignancies, apart from surgery and chemotherapy, is radiotherapy which might in itself lead to some complications in the area receiving radiation. The present study was undertaken to evaluate the prevalence of oral complications in patients undergoing radiotherapy of the oromaxillofacial area in Shahid Ramazanzadeh Radiotherapy Center in Shahid Sadoughi University of Medical Sciences...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28441344/collagenous-extracellular-matrix-biomaterials-for-tissue-engineering-lessons-from-the-common-sea-urchin-tissue
#9
REVIEW
Kheng Lim Goh, David F Holmes
Scaffolds for tissue engineering application may be made from a collagenous extracellular matrix (ECM) of connective tissues because the ECM can mimic the functions of the target tissue. The primary sources of collagenous ECM material are calf skin and bone. However, these sources are associated with the risk of having bovine spongiform encephalopathy or transmissible spongiform encephalopathy. Alternative sources for collagenous ECM materials may be derived from livestock, e.g., pigs, and from marine animals, e...
April 25, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28440976/diagnostic-value-of-the-caretm-hpv-test-in-screening-for-cervical-intraepithelial-neoplasia-grade-2-or-worse
#10
Mojgan Karimi Zarchi, Effat Heydari, Afsarolsadat Tabatabaie, Mansour Moghimi, Wesam Kooti
Background: Cervical cancer is the fourth leading cause of cancer death in women worldwide. Persistent infection with a high risk human papillomavirus (HR-HPV) is the main etiological factor, so that early early detection of HR-HPV is very important. The aim of this study was to investigate the efficacy of CareTM HPV, a new method, as compared with Pap smear, PCR, and biopsy for screening purposes. Material and Method: In this cross-sectional study, 200 sexually active women aging from 25-50 years referred to the oncology clinic of Shahid Sodoughi Yazd Hospital in 2015 with a variety of cervix epithelial lesions or a need for colposcopy were enrolled...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28440970/factors-associated-with-cigarette-smoking-in-central-parts-of-iran
#11
Mujtaba Shuja, Nizal Sarrafzadegan, Hamid Reza Roohafza, Masoumeh Sadeghi, Mahin Ghafari, Mahdi Mohammadian, Abdollah Mohammadian Hafshejani
Background: This study aims to assess factors associated with cigarette smoking in central parts of Iran. Materials and methods: We used the data of the post intervention phase of Isfahan Healthy Heart Program (IHHP) that was conducted in 2007. Logistic regression was used for calculating crude and adjusted Odds Ratios (OR). The group with the least prevalence of smoking was considered as the Reference Group (RG) and the OR for other parts of the variable was calculated based on the RG and reported with a confidence interval of 95%...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28437221/the-effect-of-reinforcement-methods-with-knotted-and-knotless-sutures-comparison-of-burst-pressures
#12
Alper Yavuz, Hakan Buluş
Sleeve gastrectomy operations have become popular among restrictive obesity surgeons, due to its effectiveness for losing weight and acceptable complication rates. However, leakage is a significant problem in these operations. In this ex vivo study, we tried to understand mechanisms of leakage and to examine the effects of two different types of frequently referred reinforcement techniques using sutures. The resected gastric specimens that were removed during sleeve gastrectomy operations were used in this ex vivo study...
September 22, 2016: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/28436858/a-spectral-ct-method-to-directly-estimate-basis-material-maps-from-experimental-photon-counting-data
#13
Taly Schmidt, Rina Barber, Emil Sidky
The proposed spectral CT method solves the constrained one-step spectral CT reconstruction (cOSSCIR) optimization problem to estimate basis material maps while modeling the nonlinear X-ray detection process and enforcing convex constraints on the basis map images. In order to apply the optimization-based reconstruction approach to experimental data, the presented method empirically estimates the effective energy-window spectra using a calibration procedure. The amplitudes of the estimated spectra were further optimized as part of the reconstruction process to reduce ring artifacts...
April 24, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28435882/geochemical-evidence-for-m%C3%A3-lange-melting-in-global-arcs
#14
Sune G Nielsen, Horst R Marschall
In subduction zones, sediments and hydrothermally altered oceanic crust, which together form part of the subducting slab, contribute to the chemical composition of lavas erupted at the surface to form volcanic arcs. Transport of this material from the slab to the overlying mantle wedge is thought to involve discreet melts and fluids that are released from various portions of the slab. We use a meta-analysis of geochemical data from eight globally representative arcs to show that melts and fluids from individual slab components cannot be responsible for the formation of arc lavas...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28435767/green-toxicology-a-strategy-for-sustainable-chemical-and-material-development
#15
EDITORIAL
Sarah E Crawford, Thomas Hartung, Henner Hollert, Björn Mathes, Bennard van Ravenzwaay, Thomas Steger-Hartmann, Christoph Studer, Harald F Krug
Green Toxicology refers to the application of predictive toxicology in the sustainable development and production of new less harmful materials and chemicals, subsequently reducing waste and exposure. Built upon the foundation of "Green Chemistry" and "Green Engineering", "Green Toxicology" aims to shape future manufacturing processes and safe synthesis of chemicals in terms of environmental and human health impacts. Being an integral part of Green Chemistry, the principles of Green Toxicology amplify the role of health-related aspects for the benefit of consumers and the environment, in addition to being economical for manufacturing companies...
2017: Environmental Sciences Europe
https://www.readbyqxmd.com/read/28433937/perturbation-effect-of-reduced-graphene-oxide-quantum-dots-rgoqds-on-aryl-hydrocarbon-receptor-ahr-pathway-in-zebrafish
#16
Jing-Hui Zhang, Tai Sun, Aping Niu, Yu-Mei Tang, Shun Deng, Wei Luo, Qun Xu, Dapeng Wei, De-Sheng Pei
Graphene quantum dots (GQDs) has been widely used in enormous fields, however, the inherent molecular mechanism of GQDs for potential risks in biological system is still elusive to date. In this study, the outstanding reduced graphene quantum dots (rGOQDs) with the QY as high as 24.62% were successfully synthesized by the improved Hummers method and DMF hydrothermal treatment approach. The rGOQDs were N-doped photoluminescent nanomaterials with functional groups on the surface. The fluorescent bio-imaging was performed by exposing zebrafish in different concentrations of the as-prepared rGOQDs, and the distribution of rGOQDs was successfully observed...
April 15, 2017: Biomaterials
https://www.readbyqxmd.com/read/28433789/macromolecular-crowding-for-tailoring-tissue-derived-fibrillated-matrices
#17
Valentina Magno, Jens Friedrichs, Heather M Weber, Marina C Prewitz, Mikhail V Tsurkan, Carsten Werner
Tissue-derived fibrillated matrices can be instrumental for the in vitro reconstitution of multiphasic extracellular microenvironments. However, despite of several advantages, the obtained scaffolds so far offer a rather narrow range of materials characteristics only. In this work, we demonstrate how macromolecular crowding (MMC) - the supplementation of matrix reconstitution media with synthetic or natural macromolecules in ways to create excluded volume effects (EVE) - can be employed for tailoring important structural and biophysical characteristics of kidney-derived fibrillated matrices...
April 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28432843/vitamin-b1-in-critically-ill-patients-needs-and-challenges
#18
REVIEW
Jake T B Collie, Ronda F Greaves, Oliver A H Jones, Que Lam, Glenn M Eastwood, Rinaldo Bellomo
BACKGROUND: Thiamine has a crucial role in energy production, and consequently thiamine deficiency (TD) has been associated with cardiac failure, neurological disorders, oxidative stress (lactic acidosis and sepsis) and refeeding syndrome (RFS). This review aims to explore analytical methodologies of thiamine compound quantification and highlight similarities, variances and limitations of current techniques and how they may be relevant to patients. CONTENT: An electronic search of Medline, PubMed and Embase databases for original articles published in peer-reviewed journals was conducted...
April 22, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28432439/characterization-of-a-functional-recombinant-human-creatine-kinase-mb-isoenzyme-prepared-by-tandem-affinity-purification-from-escherichia-coli
#19
Lihui Zou, Wen Su, Meng Wang, Wei Huang, Haijian Zhao, Enyi Zhang, Junhua Jin, Hongtao Xu, Fei Xiao
Creatine kinase isoform CK-MB has been widely applied as a biomarker of myocardial injury. While a variety of methods have been used to measure CK-MB activity or mass in clinical laboratories, a CK-MB standard is needed to eliminate between-method bias. Because the in vitro expression of human creatine kinase generates three isoenzymes, CK-MM, CK-MB, and CK-BB, it is important to establish an effective method to purify the isoform CK-MB from the mixture. In this study, we aimed at using tandem affinity purification (TAP) to purify recombinant CK-MB protein and evaluate its value in clinical laboratories...
April 21, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28430555/beyond-wires-and-seeds-reflector-guided-breast-lesion-localization-and-excision
#20
Victoria L Mango, Ralph T Wynn, Sheldon Feldman, Lauren Friedlander, Elise Desperito, Sejal N Patel, Ameer Gomberawalla, Richard Ha
Purpose To evaluate outcomes of Savi Scout (Cianna Medical, Aliso Viejo, Calif) reflector-guided localization and excision of breast lesions by analyzing reflector placement, localization, and removal, along with target excision and rates of repeat excision (referred to as re-excision). Materials and Methods A single-institution retrospective review of 100 women who underwent breast lesion localization and excision by using the Savi Scout surgical guidance system from June 2015 to May 2016 was performed. By using image guidance 0-8 days before surgery, 123 nonradioactive, infrared-activated, electromagnetic wave reflectors were percutaneously inserted adjacent to or within 111 breast targets...
April 21, 2017: Radiology
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