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https://www.readbyqxmd.com/read/27907190/are-exam-questions-known-in-advance-using-local-dependence-to-detect-cheating
#1
Stefan Zimmermann, Dietrich Klusmann, Wolfgang Hampe
Cheating is a common phenomenon in high stakes admission, licensing and university exams and threatens their validity. To detect if some exam questions had been affected by cheating, we simulated how data would look like if some test takers possessed item preknowledge: Responses to a small number of items were set to correct for 1-10% of test takers. Item difficulty, item discrimination, item fit, and local dependence were computed using an IRT 2PL model. Then changes in these item properties from the non-compromised to the compromised dataset were scrutinized for their sensitivity to item preknowledge...
2016: PloS One
https://www.readbyqxmd.com/read/27901172/conformational-states-of-hamp-domains-interacting-with-sensory-rhodopsin-membrane-systems-an-integrated-all-atom-and-coarse-grained-molecular-dynamics-simulation-approach
#2
Bikash Ranjan Sahoo, Toshimichi Fujiwara
Understanding the downstream signaling mechanism of sensory rhodopsin and its cognate transducer complex (srII-htrII) has long been a challenge in the field of photoreceptor research. Here, an integration of all-atom and coarse-grained (CG) molecular dynamics (MD) simulations in different srII-htrII complex states is carried out. It is shown that the cytoplasmic four-helix HAMP dimer gives rise to a gear-box model interaction with discrete hydrophobic packing in Natronomonas pharaonis (Np). Structural analysis in all-atom and CG-MD reveals a stable conformational state in the physiological environment (323 K and 1...
November 30, 2016: Molecular BioSystems
https://www.readbyqxmd.com/read/27896572/identification-of-novel-mutations-in-hfe-hfe2-tfr2-and-slc40a1-genes-in-chinese-patients-affected-by-hereditary-hemochromatosis
#3
Yongwei Wang, Yali Du, Gang Liu, Shanshan Guo, Bo Hou, Xianyong Jiang, Bing Han, Yanzhong Chang, Guangjun Nie
Hereditary hemochromatosis (HH) is a group of inherited iron-overload disorders associated with pathogenic defects in the genes encoding hemochromatosis (HFE), hemojuvelin (HJV/HFE2), hepcidin (HAMP), transferrin receptor 2 (TfR2), and ferroportin (FPN1/SLC40A1) proteins, and the clinical features are well described. However, there have been only a few detailed reports of HH in Chinese populations. Thus, there is insufficient patient information for population-based analyses in Chinese populations or comparative studies among different ethical groups...
November 28, 2016: International Journal of Hematology
https://www.readbyqxmd.com/read/27893504/accurate-identification-of-infection-source-in-burn-trauma-patients-with-central-line-infection-to-determine-appropriate-treatment-option-as-well-as-proper-public-reporting
#4
Holly M Hampe, Lisa Graper, Kathy Hayes-Leight, Deborah Olszewski, Matthew Moffa, Derek N Bremmer
With the advent of the Patient Safety Movement in the late 1990s and the CMS (Centers for Medicare & Medicaid Services) nonreimbursement program for never events, there has been much focus on the prevention and accurate identification of health care-associated infections such as central line-associated bloodstream infections (CLABSIs). There has certainly been a national effort to decrease the occurrence of these infections. With the implementation of patient safety initiatives such as the central line prevention bundle, there has been a considerable reduction in the number of CLABSIs except for patients with burn trauma...
January 2017: Critical Care Nursing Quarterly
https://www.readbyqxmd.com/read/27893503/impacting-care-and-treatment-of-the-burn-patient-conversion-to-electronic-documentation
#5
Holly M Hampe, Terri Keeling, Michelle Fontana, Debbie Balcik
Improving patient care through enhanced electronic communication among health care providers is aimed at reducing the number of medication and medical errors. The American Reinvestment and Recovery Act (ARRA) was signed into law in 2009, supporting the federal government's commitment to the improvement of health care quality, safety, and efficiency through requirements to implement an electronic health record by October 2015 or hospitals and eligible providers potentially realizing penalties or reduced reimbursement rates...
January 2017: Critical Care Nursing Quarterly
https://www.readbyqxmd.com/read/27803157/bacterial-energy-sensor-aer-modulates-the-activity-of-the-chemotaxis-kinase-chea-based-on-the-redox-state-of-the-flavin-cofactor
#6
Dipanjan Samanta, Joanne Widom, Peter P Borbat, Jack H Freed, Brian R Crane
Flagellated bacteria modulate their swimming behavior in response to environmental cues through the CheA/CheY signaling pathway. In addition to responding to external chemicals, bacteria also monitor internal conditions that reflect the availability of oxygen, light, and reducing equivalents - in a process termed ″Energy Taxis″. In E. coli, the transmembrane receptor Aer is the primary energy sensor for motility. Genetic and physiological data suggest that Aer monitors the electron transport chain through the redox state of its FAD cofactor...
November 1, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27796435/the-signaling-protein-mucg-negatively-affects-the-production-and-the-molecular-mass-of-alginate-in-azotobacter-vinelandii
#7
Carlos Leonel Ahumada-Manuel, Josefina Guzmán, Carlos Peña, Elva Quiroz-Rocha, Guadalupe Espín, Cinthia Núñez
Azotobacter vinelandii is a soil bacterium that produces the polysaccharide alginate. In this work, we identified a miniTn5 mutant, named GG9, which showed increased alginate production of higher molecular mass, and increased expression of the alginate biosynthetic genes algD and alg8 when compared to its parental strain. The miniTn5 was inserted within ORF Avin07920 encoding a hypothetical protein. Avin07910, located immediately downstream and predicted to form an operon with Avin07920, encodes an inner membrane multi-domain signaling protein here named mucG...
October 28, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27784639/gas-chromatography-mass-spectrometry-based-urine-metabolome-study-in-children-for-inborn-errors-of-metabolism-an-indian-experience
#8
Mahesh H Hampe, Shrimant N Panaskar, Ashwini A Yadav, Pramod W Ingale
OBJECTIVE: The present study highlights the feasibility of gas chromatography/mass spectrometry (GC/MS)-based analysis for simultaneous detection of >200 marker metabolites in urine found in characteristic pattern in inborn errors of metabolism (IEM) in India. DESIGN AND METHODS: During this retrospective study conducted from July 2013 to January 2016, we collected urine specimens on filter papers from Indian children across the country along with relevant demographic and clinical data...
October 23, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27773819/fancd2-protects-against-bone-marrow-injury-from-ferroptosis
#9
Xinxin Song, Yangchun Xie, Rui Kang, Wen Hou, Xiaofang Sun, Michael W Epperly, Joel S Greenberger, Daolin Tang
Bone marrow injury remains a serious concern in traditional cancer treatment. Ferroptosis is an iron- and oxidative-dependent form of regulated cell death that has become part of an emerging strategy for chemotherapy. However, the key regulator of ferroptosis in bone marrow injury remains unknown. Here, we show that Fanconi anemia complementation group D2 (FANCD2), a nuclear protein involved in DNA damage repair, protects against ferroptosis-mediated injury in bone marrow stromal cells (BMSCs). The classical ferroptosis inducer erastin remarkably increased the levels of monoubiquitinated FANCD2, which in turn limited DNA damage in BMSCs...
October 20, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27749722/the-cost-efficiency-and-care-effectiveness-of-probiotic-administration-with-antibiotics-to-prevent-hospital-acquired-clostridium-difficile-infection
#10
Emily S Starn, Holly Hampe, Thomas Cline
Health care facility-acquired Clostridium difficile infections (HCFA-CDI) have increased over the last several decades despite facilities developing protocols for prescribing probiotics with antibiotics to prevent HCFA-CDI. The literature does not consistently support this. A retrospective medical record review evaluated the care effectiveness of this practice. Care effectiveness was not found; patients receiving probiotics with antibiotics were twice as likely to develop HCFA-CDI (P = .004). Except with glycopeptides, patients were 1...
October 2016: Quality Management in Health Care
https://www.readbyqxmd.com/read/27747853/both-iron-excess-and-iron-depletion-impair-viability-of-rat-h9c2-cardiomyocytes-and-l6g8c5-myocytes
#11
Monika Kasztura, Magdalena Dzięgała, Kamil Kobak, Jacek Bania, Grzegorz Mazur, Waldemar Banasiak, Piotr Ponikowski, Ewa Anita Jankowska
: Background Iron is presumed to play an important role in functioning of cardiomyocytes and skeletal myocytes. There is scarcity of direct data characterizing the cells functioning when exposed to iron depletion or iron overload in cellular environment. There is some clinical evidence demonstrating that iron deficiency has serious negative prognostic consequence in heart failure (HF) patients and its correction brought clinical benefit. BACKGROUND: Iron is presumed to play an important role in functioning of cardiomyocytes and skeletal myocytes...
October 17, 2016: Kardiologia Polska
https://www.readbyqxmd.com/read/27714831/vedolizumab-provides-clinical-benefit-over-1-year-in-patients-with-active-inflammatory-bowel-disease-a-prospective-multicenter-observational-study
#12
A Stallmach, C Langbein, R Atreya, T Bruns, A Dignass, K Ende, J Hampe, F Hartmann, M F Neurath, J Maul, J C Preiss, R Schmelz, B Siegmund, H Schulze, N Teich, U von Arnim, D C Baumgart, C Schmidt
BACKGROUND: Vedolizumab, a monoclonal antibody targeting the α4β7-integrin, is effective in inducing and maintaining clinical remission in Crohn's disease and ulcerative colitis according to randomised clinical trials. AIM: To determine the long-term effectiveness of vedolizumab in a real-world clinical setting. METHODS: This observational registry assessed the clinical outcome in patients treated with vedolizumab for clinically active Crohn's disease (n = 67) or ulcerative colitis (n = 60)...
December 2016: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/27708757/measuring-cellular-traction-forces-on-non-planar-substrates
#13
Jérôme R D Soiné, Nils Hersch, Georg Dreissen, Nico Hampe, Bernd Hoffmann, Rudolf Merkel, Ulrich S Schwarz
Animal cells use traction forces to sense the mechanics and geometry of their environment. Measuring these traction forces requires a workflow combining cell experiments, image processing and force reconstruction based on elasticity theory. Such procedures have already been established mainly for planar substrates, in which case one can use the Green's function formalism. Here we introduce a workflow to measure traction forces of cardiac myofibroblasts on non-planar elastic substrates. Soft elastic substrates with a wave-like topology were micromoulded from polydimethylsiloxane and fluorescent marker beads were distributed homogeneously in the substrate...
October 6, 2016: Interface Focus
https://www.readbyqxmd.com/read/27675663/single-nucleotide-polymorphisms-in-bmp-smad4-hamp-are-associated-with-outcome-of-patients-receiving-definitive-radiation-therapy-for-non-small-cell-lung-cancer
#14
J Yang, T Xu, X Yuan, D R Gomez, Y Song, R U Komaki, Z Liao
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27668746/open-surgical-versus-minimal-invasive-necrosectomy-of-the-pancreas-a-retrospective-multicenter-analysis-of-the-german-pancreatitis-study-group
#15
Sebastian Rasch, Veit Phillip, Stephanie Reichel, Bettina Rau, Christian Zapf, Jonas Rosendahl, Ulrich Halm, Markus Zachäus, Martin Müller, Alexander Kleger, Albrecht Neesse, Jochen Hampe, Mark Ellrichmann, Felix Rückert, Peter Strauß, Alexander Arlt, Volker Ellenrieder, Thomas M Gress, Werner Hartwig, Ernst Klar, Joachim Mössner, Stefan Post, Roland M Schmid, Thomas Seufferlein, Marco Siech, Jens Werner, Uwe Will, Hana Algül
BACKGROUND: Necrotising pancreatitis, and particularly infected necrosis, are still associated with high morbidity and mortality. Since 2011, a step-up approach with lower morbidity rates compared to initial open necrosectomy has been established. However, mortality and complication rates of this complex treatment are hardly studied thereafter. METHODS: The German Pancreatitis Study Group performed a multicenter, retrospective study including 220 patients with necrotising pancreatitis requiring intervention, treated at 10 hospitals in Germany between January 2008 and June 2014...
2016: PloS One
https://www.readbyqxmd.com/read/27667164/characterization-of-hepcidin-response-to-holotransferrin-in-novel-recombinant-tfr1-hepg2-cells
#16
Kosha Mehta, Mark Busbridge, Derek Renshaw, Robert W Evans, Sebastien Farnaud, Vinood B Patel
Hepcidin is the key regulator of systemic iron homeostasis. The iron-sensing mechanisms and the role of intracellular iron in modulating hepatic hepcidin secretion are unclear. Therefore, we created a novel cell line, recombinant-TfR1 HepG2, expressing iron-response-element-independent TFRC mRNA to promote cellular iron-overload and examined the effect of excess holotransferrin (5g/L) on cell-surface TfR1, iron content, hepcidin secretion and mRNA expressions of TFRC, HAMP, SLC40A1, HFE and TFR2. Results showed that the recombinant cells exceeded levels of cell-surface TfR1 in wild-type cells under basal (2...
October 2016: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/27667161/next-generation-sequencing-of-hereditary-hemochromatosis-related-genes-novel-likely-pathogenic-variants-found-in-the-portuguese-population
#17
Ricardo Faria, Bruno Silva, Catarina Silva, Pedro Loureiro, Ana Queiroz, Sofia Fraga, Jorge Esteves, Diana Mendes, Rita Fleming, Luís Vieira, João Gonçalves, Paula Faustino
Hereditary hemochromatosis (HH) is an autosomal recessive disorder characterized by excessive iron absorption resulting in pathologically increased body iron stores. It is typically associated with common HFE gene mutation (p.Cys282Tyr and p.His63Asp). However, in Southern European populations up to one third of HH patients do not carry the risk genotypes. This study aimed to explore the use of next-generation sequencing (NGS) technology to analyse a panel of iron metabolism-related genes (HFE, TFR2, HJV, HAMP, SLC40A1, and FTL) in 87 non-classic HH Portuguese patients...
October 2016: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/27635343/antioxidant-rich-leaf-extract-of-barringtonia-racemosa-significantly-alters-the-in-vitro-expression-of-genes-encoding-enzymes-that-are-involved-in-methylglyoxal-degradation-iii
#18
Kin Weng Kong, Azlina Abdul Aziz, Nurhanani Razali, Norhaniza Aminuddin, Sarni Mat Junit
BACKGROUND: Barringtonia racemosa is a medicinal plant belonging to the Lecythidaceae family. The water extract of B. racemosa leaf (BLE) has been shown to be rich in polyphenols. Despite the diverse medicinal properties of B. racemosa, information on its major biological effects and the underlying molecular mechanisms are still lacking. METHODS: In this study, the effect of the antioxidant-rich BLE on gene expression in HepG2 cells was investigated using microarray analysis in order to shed more light on the molecular mechanism associated with the medicinal properties of the plant...
2016: PeerJ
https://www.readbyqxmd.com/read/27604469/an-expanded-evaluation-of-protein-function-prediction-methods-shows-an-improvement-in-accuracy
#19
Yuxiang Jiang, Tal Ronnen Oron, Wyatt T Clark, Asma R Bankapur, Daniel D'Andrea, Rosalba Lepore, Christopher S Funk, Indika Kahanda, Karin M Verspoor, Asa Ben-Hur, Da Chen Emily Koo, Duncan Penfold-Brown, Dennis Shasha, Noah Youngs, Richard Bonneau, Alexandra Lin, Sayed M E Sahraeian, Pier Luigi Martelli, Giuseppe Profiti, Rita Casadio, Renzhi Cao, Zhaolong Zhong, Jianlin Cheng, Adrian Altenhoff, Nives Skunca, Christophe Dessimoz, Tunca Dogan, Kai Hakala, Suwisa Kaewphan, Farrokh Mehryary, Tapio Salakoski, Filip Ginter, Hai Fang, Ben Smithers, Matt Oates, Julian Gough, Petri Törönen, Patrik Koskinen, Liisa Holm, Ching-Tai Chen, Wen-Lian Hsu, Kevin Bryson, Domenico Cozzetto, Federico Minneci, David T Jones, Samuel Chapman, Dukka Bkc, Ishita K Khan, Daisuke Kihara, Dan Ofer, Nadav Rappoport, Amos Stern, Elena Cibrian-Uhalte, Paul Denny, Rebecca E Foulger, Reija Hieta, Duncan Legge, Ruth C Lovering, Michele Magrane, Anna N Melidoni, Prudence Mutowo-Meullenet, Klemens Pichler, Aleksandra Shypitsyna, Biao Li, Pooya Zakeri, Sarah ElShal, Léon-Charles Tranchevent, Sayoni Das, Natalie L Dawson, David Lee, Jonathan G Lees, Ian Sillitoe, Prajwal Bhat, Tamás Nepusz, Alfonso E Romero, Rajkumar Sasidharan, Haixuan Yang, Alberto Paccanaro, Jesse Gillis, Adriana E Sedeño-Cortés, Paul Pavlidis, Shou Feng, Juan M Cejuela, Tatyana Goldberg, Tobias Hamp, Lothar Richter, Asaf Salamov, Toni Gabaldon, Marina Marcet-Houben, Fran Supek, Qingtian Gong, Wei Ning, Yuanpeng Zhou, Weidong Tian, Marco Falda, Paolo Fontana, Enrico Lavezzo, Stefano Toppo, Carlo Ferrari, Manuel Giollo, Damiano Piovesan, Silvio C E Tosatto, Angela Del Pozo, José M Fernández, Paolo Maietta, Alfonso Valencia, Michael L Tress, Alfredo Benso, Stefano Di Carlo, Gianfranco Politano, Alessandro Savino, Hafeez Ur Rehman, Matteo Re, Marco Mesiti, Giorgio Valentini, Joachim W Bargsten, Aalt D J van Dijk, Branislava Gemovic, Sanja Glisic, Vladmir Perovic, Veljko Veljkovic, Nevena Veljkovic, Danillo C Almeida-E-Silva, Ricardo Z N Vencio, Malvika Sharan, Jörg Vogel, Lakesh Kansakar, Shanshan Zhang, Slobodan Vucetic, Zheng Wang, Michael J E Sternberg, Mark N Wass, Rachael P Huntley, Maria J Martin, Claire O'Donovan, Peter N Robinson, Yves Moreau, Anna Tramontano, Patricia C Babbitt, Steven E Brenner, Michal Linial, Christine A Orengo, Burkhard Rost, Casey S Greene, Sean D Mooney, Iddo Friedberg, Predrag Radivojac
BACKGROUND: A major bottleneck in our understanding of the molecular underpinnings of life is the assignment of function to proteins. While molecular experiments provide the most reliable annotation of proteins, their relatively low throughput and restricted purview have led to an increasing role for computational function prediction. However, assessing methods for protein function prediction and tracking progress in the field remain challenging. RESULTS: We conducted the second critical assessment of functional annotation (CAFA), a timed challenge to assess computational methods that automatically assign protein function...
2016: Genome Biology
https://www.readbyqxmd.com/read/27599775/influence-of-the-availability-of-iron-during-hypoxia-on-the-genes-associated-with-apoptotic-activity-and-local-iron-metabolism-in-rat-h9c2%C3%A2-cardiomyocytes-and-l6g8c5%C3%A2-skeletal-myocytes
#20
Magdalena Dziegala, Monika Kasztura, Kamil Kobak, Jacek Bania, Waldemar Banasiak, Piotr Ponikowski, Ewa A Jankowska
The differential availability of iron during hypoxia is presumed to affect the functioning of cardiac and skeletal myocytes. Rat H9C2 cardiomyocytes and L6G8C5 myocytes were cultured for 48 h in normoxic or hypoxic conditions at the optimal, reduced or increased iron concentration. The mRNA expression levels of markers of apoptosis [B‑cell lymphoma‑2 (Bcl2; inhibition) and Bcl‑2‑activated X protein (Bax; induction)], atrophy (Atrogin), glycolysis (pyruvate kinase 2; PKM2) and iron metabolism [transferrin receptor 1 (TfR1; iron importer), ferroportin 1 (FPN1; iron exporter), ferritin heavy chain (FTH; iron storage protein) and hepcidin (HAMP; iron regulator)] were determined using reverse transcription‑quantitative polymerase chain reaction, and cell viability was measured using an tetrazolium reduction assay...
October 2016: Molecular Medicine Reports
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