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Validity testing

D-W Wang, Y-Q Wang, H-S Shu
OBJECTIVE: Extracellular signal-regulated kinase (ERK)/mitogen activated protein kinase (MAPK) signal pathway participates in cell proliferation, cycle, and apoptosis. MiR-16 is down-regulated in the pituitary tumor. This study investigated the role and related mechanism of miR-16 on pituitary tumor proliferation, cycle, and apoptosis. PATIENTS AND METHODS: Dual-luciferase reporter assay was conducted to demonstrate the targeted regulation between miR-16 and MEK1...
March 2018: European Review for Medical and Pharmacological Sciences
Cristina Teixidó, Ana Giménez-Capitán, Miguel Ángel Molina-Vila, Vicente Peg, Niki Karachaliou, Alejandra Rodríguez-Capote, Josep Castellví, Rafael Rosell
CONTEXT: - Technologic advances have contributed to the increasing relevance of RNA analysis in clinical oncology practice. The different genetic aberrations that can be screened with RNA include gene fusions and splice variants. Validated methods of identifying these alterations include fluorescence in situ hybridization, immunohistochemistry, reverse transcription-polymerase chain reaction, and next-generation sequencing, which can provide physicians valuable information on disease and treatment of cancer patients...
April 2018: Archives of Pathology & Laboratory Medicine
Zeinab El-Taher Hassan, Nehad M Farag, Wael M Elshemey
This work aims at designing a computer program to calculate the necessary amount of shielding for a given or proposed linear accelerator room design in radiotherapy. The program (Shield Calculation in Radiotherapy, SCR) is developed using Microsoft Visual Basic. It applies the treatment room shielding calculations of the NCRP report no. 151 to calculate proper shielding thicknesses for a given linear accelerator treatment room design. The program is composed of six main user-friendly interfaces. The first one enables the user to upload whatever treatment room design of his choice and to measure the distances required for shielding calculations...
March 22, 2018: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
Elise Cornelis, Ellen Gorus, Karen Van Weverbergh, Ingo Beyer, Patricia De Vriendt
BACKGROUND: Several methods have been developed to evaluate activities of daily living (ADLs) in mild cognitive impairment (MCI) and mild dementia. This study evaluated the convergent and concurrent validity between (1) two report-based methods (the advanced (a)- and instrumental (i)-ADL tools) and (2) a performance-based method (the Naturalistic Action Test (NAT)) to check if their ability to differentiate between cognitively healthy comparisons (HCs), persons with MCI, and persons with mild Alzheimer's disease (AD) are comparable to each other...
March 22, 2018: International Psychogeriatrics
Jiro Abe, Toshimasa Okazaki, Naohiko Kikuchi, Satomi Takahashi, Akira Sakurada, Yoshinori Okada
OBJECTIVE: This study was conducted to evaluate the risk of recurrence possibly caused by preoperative bronchoscopic cancer confirmation in stage1A non-small cell lung cancer. METHODS: One hundred and seventy-nine cases of peripheral non-small cell lung cancer (including 151 adenocarcinoma) with no more than 3 cm in their tumor longer diameter were selected. All patients underwent preoperative diagnostic bronchoscopy followed by lobectomy, and were demonstrated to have pathologically free of lymph node involvement and pleural involvement...
March 21, 2018: General Thoracic and Cardiovascular Surgery
Timon M Fabius, Jeffrey R Benistant, Lindsey Bekkedam, Job van der Palen, Frans H C de Jongh, Michiel M M Eijsvogel
INTRODUCTION: Obstructive sleep apnea (OSA) is common, and diagnosis requires expensive and laborious testing to assess the apnea hypopnea index (AHI). We performed an analysis to explore the relationship between the oxygen desaturation index (ODI) as measured with pulse oximetry and the AHI in our large portable monitoring (PM) database to find an optimal cutoff value for the ODI in order to be able to exclude AHI ≥ 5 on PM. METHODS: Three thousand four hundred thirteen PM recordings were randomly divided into a training set (N = 2281) and a test set (N = 1132)...
March 21, 2018: Sleep & Breathing, Schlaf & Atmung
Catalina Herrera Almanza, David E Sahn
Female secondary school attendance has recently increased in sub-Saharan Africa, and so has the risk of becoming pregnant while attending school. We analyze the impact of teenage pregnancy on young women's human capital using longitudinal data in Madagascar that capture the transition from adolescence to adulthood for a cohort aged 21-24 in 2012, first interviewed in 2004. We find that early childbearing increases the likelihood of dropping out of school and decreases the chances of completing secondary school...
March 21, 2018: Demography
Alessandra Biancolillo, Silvia De Luca, Sebastian Bassi, Léa Roudier, Remo Bucci, Andrea D Magrì, Federico Marini
Common hazelnuts are widely present in human diet all over the world, and their beneficial effects on the health have been extensively investigated and demonstrated. Different in-depth researches have highlighted that the harvesting area can define small variations in the chemical composition of the fruits, affecting their quality. As a consequence, it has become relevant to develop methodologies which would allow authenticating and tracing hazelnuts. In the light of this, the present work aims to develop a non-destructive method for the authentication of a specific high-quality Italian hazelnut, "Nocciola Romana," registered with a protected designation of origin (PDO)...
March 21, 2018: Environmental Science and Pollution Research International
Zhi-Cheng Li, Hongmin Bai, Qiuchang Sun, Qihua Li, Lei Liu, Yan Zou, Yinsheng Chen, Chaofeng Liang, Hairong Zheng
OBJECTIVES: To build a reliable radiomics model from multiregional and multiparametric magnetic resonance imaging (MRI) for pretreatment prediction of O6 -methylguanine-DNA methyltransferase (MGMT) promotor methylation status in glioblastoma multiforme (GBM). METHODS: In this retrospective multicentre study, 1,705 multiregional radiomics features were automatically extracted from multiparametric MRI. A radiomics model with a minimal set of all-relevant features and a radiomics model with univariately-predictive and non-redundant features were built for MGMT methylation prediction from a primary cohort (133 patients) and tested on an independent validation cohort (60 patients)...
March 21, 2018: European Radiology
Yinjuan Wang, Marion Tissot, Gwenaël Rolin, Patrice Muret, Sophie Robin, Jean-Yves Berthon, Li He, Philippe Humbert, Céline Viennet
Primary melanocytes in culture are useful models for studying epidermal pigmentation and efficacy of melanogenic compounds, or developing advanced therapy medicinal products. Cell extraction is an inevitable and critical step in the establishment of cell cultures. Many enzymatic methods for extracting and growing cells derived from human skin, such as melanocytes, are described in literature. They are usually based on two enzymatic steps, Trypsin in combination with Dispase, in order to separate dermis from epidermis and subsequently to provide a suspension of epidermal cells...
March 21, 2018: Cytotechnology
Bruno Fautrel, Rieke Alten, Bruce Kirkham, Inmaculada de la Torre, Frederick Durand, Jane Barry, Thorsten Holzkaemper, Walid Fakhouri, Peter C Taylor
Current guidelines for the management of rheumatoid arthritis (RA) recommend early treatment and a treat-to-target goal of remission or low disease activity. Over the past decade, this approach has been extremely successful in reducing disease activity and joint damage in patients with RA. At the same time, however, overall patient perception of well-being appears to have decreased with respect to outcome measures considered important by patients themselves, such as pain, fatigue, physical function and quality of life...
March 21, 2018: Rheumatology International
Sidharth Arora, Pritam Singh, Richa Rani, Sanjoy Ghosh
Direct measurement of cell biomass is difficult in a solid-state fermentation (SSF) process involving filamentous fungi since the mycelium and the solid substrate are often inseparable. However, respiratory data are rich in information for real-time monitoring of microbial biomass production. In this regard, a correlation was obtained between oxygen uptake rate (OUR) and biomass concentration (X) of Rhizopus oryzae MTCC 1987, during phytase production, in an intermittently mixed novel SSF bioreactor. To obtain the correlation, various models describing sigmoidal growth were tested, namely the logistic, Gompertz, Stannard, and Schnute models...
March 21, 2018: Bioprocess and Biosystems Engineering
Erica Tirloni, Cristian Bernardi, Sandro Drago, Giuseppe Stampone, Francesco Pomilio, Patrizia Cattaneo, Simone Stella
Objective of the present study was to test the performances of a loop-mediated isothermal amplification (LAMP)-based method for the detection of Listeria monocytogenes , with particular focus on the dairy products. The specificity of the method was evaluated on 42 different Listeria spp. strains from collections, food and environmental samples. 100% (32 of 32) of the L. monocytogenes strains were correctly recognised, and none of other 10 Listeria spp. strains was misidentified. The sensitivity was evaluated on four L...
October 20, 2017: Italian Journal of Food Safety
Benjamin Stich, Delphine Van Inghelandt
Genomic prediction is a routine tool in breeding programs of most major animal and plant species. However, its usefulness for potato breeding has not yet been evaluated in detail. The objectives of this study were to (i) examine the prospects of genomic prediction of key performance traits in a diversity panel of tetraploid potato modeling additive, dominance, and epistatic effects, (ii) investigate the effects of size and make up of training set, number of test environments and molecular markers on prediction accuracy, and (iii) assess the effect of including markers from candidate genes on the prediction accuracy...
2018: Frontiers in Plant Science
Tatiana V Karpinets, Vancheswaran Gopalakrishnan, Jennifer Wargo, Andrew P Futreal, Christopher W Schadt, Jianhua Zhang
Studies of microbial communities by targeted sequencing of rRNA genes lead to recovering numerous rare low-abundance taxa with unknown biological roles. We propose to study associations of such rare organisms with their environments by a computational framework based on transformation of the data into qualitative variables. Namely, we analyze the sparse table of putative species or OTUs (operational taxonomic units) and samples generated in such studies, also known as an OTU table, by collecting statistics on co-occurrences of the species and on shared species richness across samples...
2018: Frontiers in Microbiology
Murad Megjhani, Kalijah Terilli, Hans-Peter Frey, Angela G Velazquez, Kevin William Doyle, Edward Sander Connolly, David Jinou Roh, Sachin Agarwal, Jan Claassen, Noemie Elhadad, Soojin Park
Purpose: Accurate prediction of delayed cerebral ischemia (DCI) after subarachnoid hemorrhage (SAH) can be critical for planning interventions to prevent poor neurological outcome. This paper presents a model using convolution dictionary learning to extract features from physiological data available from bedside monitors. We develop and validate a prediction model for DCI after SAH, demonstrating improved precision over standard methods alone. Methods: 488 consecutive SAH admissions from 2006 to 2014 to a tertiary care hospital were included...
2018: Frontiers in Neurology
Annalisa Colonna, Anna B Smith, Stuart Smith, Kirandeep VanDenEshof, Jane Orgill, Paul Gringras, Deb K Pal
Background: Consolidation of learning occurs during sleep but when it is disturbed there may be an adverse impact upon these functions. While research has focused upon how sleep affects cognition in adulthood, the effects of disrupted sleep are likely to impact more heavily on learning among children and adolescents. We aimed to investigate whether a night's sleep impacts upon executive function compared with an equivalent wakefulness period. We also wanted to know whether restricting sleep would reduce these effects on performance...
2018: Frontiers in Psychology
Jan P Vandenbroucke, Neil Pearce
Where do new research questions come from? This is at best only partially taught in courses or textbooks about clinical or epidemiological research. Methods are taught under the assumption that a researcher already knows the research question and knows which methods will fit that question. Similarly, the real complexity of the thought processes that lead to a scientific undertaking is almost never described in published papers. In this paper, we first discuss how to get an idea that is worth researching. We describe sources of new ideas and how to foster a creative attitude by "cultivating your thoughts"...
2018: Clinical Epidemiology
Fangbin Zhou, Yaying Zhou, Ming Yang, Jinli Wen, Jun Dong, Wenyong Tan
Background: Circulating endothelial cells (CECs) and their subpopulations could be potential novel biomarkers for various malignancies. However, reliable enumerable methods are warranted to further improve their clinical utility. This study aimed to optimize a flow cytometric method (FCM) assay for CECs and subpopulations in peripheral blood for patients with solid cancers. Patients and methods: An FCM assay was used to detect and identify CECs. A panel of 60 blood samples, including 44 metastatic cancer patients and 16 healthy controls, were used in this study...
2018: Cancer Management and Research
Luca Giacomelli, Stefano Togni, Martino Meneghin, Roberto Eggenhöffner, Giada Maramaldi
Purpose: The purpose of this in vivo study is to evaluate the acute clinical application of a multicomponent powder (Vitachelox® ), including three naturally occurring standardized extracts rich in polyphenols (grape seed extract, green tea extract, oak wood/bark extract), on healthy volunteers by measuring prevention of any metal deposition within the stratum corneum (SC) following a 6-h exposure period in a polluted environment. Patients and methods: In this in vivo study, we evaluated the skin protective activity of the multicomponent powder formulated in a base emulsion compared to a relevant placebo cream...
2018: Clinical, Cosmetic and Investigational Dermatology
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