keyword
MENU ▼
Read by QxMD icon Read
search

Stephens johnson

keyword
https://www.readbyqxmd.com/read/28930436/development-of-a-cigarette-tobacco-filler-standard-reference-material
#1
Lane C Sander, Jeanita S Pritchett, Yasmine C Daniels, Laura J Wood, Brian E Lang, Stephen A Wise, James H Yen, Tricia L Johnson, Matthew J Walters, Tracy Phillips, Matthew R Holman, Grace E Lee, Joseph G Lisko, Brian Lane, Liza Valentin-Blasini, Clifford Watson
A new tobacco filler Standard Reference Material (SRM) has been issued by the National Institute of Standards and Technology (NIST) in September 2016 with certified and reference mass fraction values for nicotine, N-nitrosonornicotine, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone, and volatiles. The constituents have been determined by multiple analytical methods with measurements at NIST and at the Centers for Disease Control and Prevention, and with confirmatory measurements by commercial laboratories. This effort highlights the development of the first SRM for reduced nicotine and reduced tobacco-specific nitrosamines with certified values for composition...
September 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28914966/monte-carlo-methods-for-nonparametric-regression-with-heteroscedastic-measurement-error
#2
Julie McIntyre, Brent A Johnson, Stephen M Rappaport
Nonparametric regression is a fundamental problem in statistics but challenging when the independent variable is measured with error. Among the first approaches was an extension of deconvoluting kernel density estimators for homescedastic measurement error. The main contribution of this article is to propose a new simulation-based nonparametric regression estimator for the heteroscedastic measurement error case. Similar to some earlier proposals, our estimator is built on principles underlying deconvoluting kernel density estimators...
September 15, 2017: Biometrics
https://www.readbyqxmd.com/read/28914715/diffuse-staining-for-activated-notch1-correlates-with-notch1-mutation-status-and-is-associated-with-worse-outcome-in-adenoid-cystic-carcinoma
#3
Dipti P Sajed, William C Faquin, Chris Carey, Eric A Severson, Amir H Afrogheh, Carl A Johnson, Stephen C Blacklow, Nicole G Chau, Derrick T Lin, Jeffrey F Krane, Vickie Y Jo, Joaquín J Garcia, Lynette M Sholl, Jon C Aster
NOTCH1 is frequently mutated in adenoid cystic carcinoma (ACC). To test the idea that immunohistochemical (IHC) staining can identify ACCs with NOTCH1 mutations, we performed IHC for activated NOTCH1 (NICD1) in 197 cases diagnosed as ACC from 173 patients. NICD1 staining was positive in 194 cases (98%) in 2 major patterns: subset positivity, which correlated with tubular/cribriform histology; and diffuse positivity, which correlated with a solid histology. To determine the relationship between NICD1 staining and NOTCH1 mutational status, targeted exome sequencing data were obtained on 14 diffusely NICD1-positive ACC specimens from 11 patients and 15 subset NICD1-positive ACC specimens from 15 patients...
September 13, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28912365/d-dimer-in-african-americans-whole-genome-sequence-analysis-and-relationship-to-cardiovascular-disease-risk-in-the-jackson-heart-study
#4
Laura M Raffield, Neil A Zakai, Qing Duan, Cecelia Laurie, Joshua D Smith, Marguerite R Irvin, Margaret F Doyle, Rakhi P Naik, Ci Song, Ani W Manichaikul, Yongmei Liu, Peter Durda, Jerome I Rotter, Nancy S Jenny, Stephen S Rich, James G Wilson, Andrew D Johnson, Adolfo Correa, Yun Li, Deborah A Nickerson, Kenneth Rice, Ethan M Lange, Mary Cushman, Leslie A Lange, Alex P Reiner
OBJECTIVE: Plasma levels of the fibrinogen degradation product D-dimer are higher among African Americans (AAs) compared with those of European ancestry and higher among women compared with men. Among AAs, little is known of the genetic architecture of D-dimer or the relationship of D-dimer to incident cardiovascular disease. APPROACH AND RESULTS: We measured baseline D-dimer in 4163 AAs aged 21 to 93 years from the prospective JHS (Jackson Heart Study) cohort and assessed association with incident cardiovascular disease events...
September 14, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28912153/comprehensive-genomic-profiling-of-282-pediatric-low-and-high-grade-gliomas-reveals-genomic-drivers-tumor-mutational-burden-and-hypermutation-signatures
#5
Adrienne Johnson, Eric Severson, Laurie Gay, Jo-Anne Vergilio, Julia Elvin, James Suh, Sugganth Daniel, Mandy Covert, Garrett M Frampton, Sigmund Hsu, Glenn J Lesser, Kimberly Stogner-Underwood, Ryan T Mott, Sarah Z Rush, Jennifer J Stanke, Sonika Dahiya, James Sun, Prasanth Reddy, Zachary R Chalmers, Rachel Erlich, Yakov Chudnovsky, David Fabrizio, Alexa B Schrock, Siraj Ali, Vincent Miller, Philip J Stephens, Jeffrey Ross, John R Crawford, Shakti H Ramkissoon
BACKGROUND: Pediatric brain tumors are the leading cause of death for children with cancer in the U.S. Incorporating next-generation sequencing data for both pediatric low-grade (pLGGs) and high-grade gliomas (pHGGs) can inform diagnostic, prognostic, and therapeutic decision-making. MATERIALS AND METHODS: We performed comprehensive genomic profiling on 282 pediatric gliomas (157 pHGGs, 125 pLGGs), sequencing 315 cancer-related genes and calculating the tumor mutational burden (TMB; mutations per megabase [Mb])...
September 14, 2017: Oncologist
https://www.readbyqxmd.com/read/28891700/rhabdomyolysis-and-artifactual-increase-in-plasma-bicarbonate-concentration-in-an-amazon-parrot-amazona-species
#6
Mary K Leissinger, James G Johnson, Thomas N Tully, Stephen D Gaunt
A 7-year-old male Amazon parrot housed outdoors presented with acute collapse, marked lethargy, and open-mouth breathing. The patient had stiffness of the pectoral muscles, and petechiation and ecchymosis noted around the eyes and beneath the mandible. Laboratory data revealed markedly increased aspartate aminotransferase, creatine kinase, and lactate dehydrogenase activity consistent with rhabdomyolysis, as well as markedly increased plasma bicarbonate concentration. Marked clinical improvement and resolution of laboratory abnormalities occurred with fluid therapy, administration of a nonsteroidal anti-inflammatory medication, and husbandry modifications, including indoor housing and dietary alteration...
September 2017: Journal of Avian Medicine and Surgery
https://www.readbyqxmd.com/read/28882482/ester-prodrugs-of-ethambutol-control-its-antibacterial-activity-and-provide-rapid-screening-for-mycobacterial-hydrolase-activity
#7
Erik M Larsen, Dominique C Stephens, Nathan H Clarke, R Jeremy Johnson
M. tuberculosis contains an unusually high number of serine hydrolases by proteome percentage compared to other common bacteria or humans. This letter describes a method to probe the global substrate specificity of mycobacterial serine hydrolases with ester-protected prodrugs of ethambutol, a first-line antibiotic treatment for TB. These compounds were synthesized directly from ethambutol using a selective o-acylation to yield products in high yield and purity with minimal workup. A library of derivatives was screened against M...
October 1, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28874686/targeted-error-suppressed-quantification-of-circulating-tumor-dna-using-semi-degenerate-barcoded-adapters-and-biotinylated-baits
#8
Miguel Alcaide, Stephen Yu, Jordan Davidson, Marco Albuquerque, Kevin Bushell, Daniel Fornika, Sarah Arthur, Bruno M Grande, Suzan McNamara, Mathilde Couetoux du Tertre, Gerald Batist, David G Huntsman, Luca Cavallone, Adriana Aguilar, Mark Basik, Nathalie A Johnson, Rebecca J Deyell, S Rod Rassekh, Ryan D Morin
Ultrasensitive methods for rare allele detection are critical to leverage the full potential offered by liquid biopsies. Here, we describe a novel molecular barcoding method for the precise detection and quantification of circulating tumor DNA (ctDNA). The major benefits of our design include straightforward and cost-effective production of barcoded adapters to tag individual DNA molecules before PCR and sequencing, and better control over cross-contamination between experiments. We validated our approach in a cohort of 24 patients with a broad spectrum of cancer diagnoses by targeting and quantifying single-nucleotide variants (SNVs), indels and genomic rearrangements in plasma samples...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28870720/post-resuscitation-arterial-oxygen-and-carbon-dioxide-and-outcomes-after-out-of-hospital-cardiac-arrest
#9
Henry E Wang, David K Prince, Ian R Drennan, Brian Grunau, David Carlbom, Nicholas Johnson, Matthew Hansen, Jonathan Elmer, Jim Christenson, Peter Kudenchuk, Tom Aufderheide, Myron Weisfeldt, Ahamed Idris, Stephen Trzeciak, Michael Kurz, Jon C Rittenberger, Denise Griffiths, Jamie Jasti, Susanne May
OBJECTIVE: To determine if arterial oxygen and carbon dioxide abnormalities in the first 24hours after return of spontaneous circulation (ROSC) are associated with increased mortality in adult out-of-hospital cardiac arrest (OHCA). METHODS: We used data from the Resuscitation Outcomes Consortium (ROC), including adult OHCA with sustained ROSC ≥1hour after Emergency Department arrival and at least one arterial blood gas (ABG) measurement. Among ABGs measured during the first 24hours of hospitalization, we identified the presence of hyperoxemia (PaO2 ≥300mmHg), hypoxemia (PaO2 <60mmHg), hypercarbia (PaCO2>50mmHg) and hypocarbia (PaCO2<30mmHg)...
September 1, 2017: Resuscitation
https://www.readbyqxmd.com/read/28866864/the-association-between-insulin-resistance-and-atrial-fibrillation-a-cross-sectional-analysis-from-sprint-systolic-blood-pressure-intervention-trial
#10
Monique E Cho, Timothy E Craven, Alfred K Cheung, Stephen P Glasser, Mahboob Rahman, Elsayed Z Soliman, Randall S Stafford, Karen C Johnson, Jeffrey T Bates, Anna Burgner, Addison A Taylor, Leonardo Tamariz, Rocky Tang, Srinivasan Beddhu
It is unclear whether metabolic syndrome (MetS) is associated with atrial fibrillation (AF) in an older population with greater cardiovascular risk, including those with chronic kidney disease. The authors investigated the association between MetS and AF in participants in SPRINT (Systolic Blood Pressure Intervention Trial). MetS was defined based on the Modified Third National Cholesterol Education Program. The baseline prevalence rate for MetS was 55%, while 8.2% of the participants had AF. In multivariate regression analyses, AF was not associated with presence of MetS in either chronic kidney disease or non-chronic kidney disease subgroups...
September 3, 2017: Journal of Clinical Hypertension
https://www.readbyqxmd.com/read/28862765/an-fmea-evaluation-of-intensity-modulated-radiation-therapy-dose-delivery-failures-at-tolerance-criteria-levels
#11
Jacqueline Tonigan Faught, Peter A Balter, Jennifer L Johnson, Stephen F Kry, Laurence E Court, Francesco C Stingo, David S Followill
PURPOSE: The objective of this work was to assess both the perception of failure modes in Intensity Modulated Radiation Therapy (IMRT) when the linac is operated at the edge of tolerance given in AAPM TG-40(1) and TG-142(2) as well as the application of FMEA to this specific section of the IMRT process. METHODS: An online survey was distributed to approximately 2000 physicists worldwide that participate in quality services provided by the Imaging and Radiation Oncology Core - Houston (IROC-H)...
September 1, 2017: Medical Physics
https://www.readbyqxmd.com/read/28858207/x-chromosome-evolution-in-cetartiodactyla
#12
Anastasia A Proskuryakova, Anastasia I Kulemzina, Polina L Perelman, Alexey I Makunin, Denis M Larkin, Marta Farré, Anna V Kukekova, Jennifer Lynn Johnson, Natalya A Lemskaya, Violetta R Beklemisheva, Melody E Roelke-Parker, June Bellizzi, Oliver A Ryder, Stephen J O'Brien, Alexander S Graphodatsky
The phenomenon of a remarkable conservation of the X chromosome in eutherian mammals has been first described by Susumu Ohno in 1964. A notable exception is the cetartiodactyl X chromosome, which varies widely in morphology and G-banding pattern between species. It is hypothesized that this sex chromosome has undergone multiple rearrangements that changed the centromere position and the order of syntenic segments over the last 80 million years of Cetartiodactyla speciation. To investigate its evolution we have selected 26 evolutionarily conserved bacterial artificial chromosome (BAC) clones from the cattle CHORI-240 library evenly distributed along the cattle X chromosome...
August 31, 2017: Genes
https://www.readbyqxmd.com/read/28855284/whole-genome-sequencing-based-mapping-and-candidate-identification-of-mutations-from-fixed-zebrafish-tissue
#13
Nicholas E Sanchez, Breanne L Harty, Thomas O'Reilly-Pol, Sarah D Ackerman, Amy L Herbert, Melanie Holmgren, Stephen L Johnson, Ryan S Gray, Kelly R Monk
As forward genetic screens in zebrafish become more common, the number of mutants that cannot be identified by gross morphology or through transgenic approaches, such as many nervous system defects, has also increased. Screening for these difficult to visualize phenotypes demands techniques such as whole-mount in situ hybridization (WISH) or antibody staining, which require tissue fixation. To date, fixed tissue has not been amenable for generating libraries for whole genome sequencing (WGS). Here, we describe a method for utilizing genomic DNA from fixed tissue and a bioinformatics suite for WGS-based mapping of zebrafish mutants...
August 29, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28846757/apolipoprotein-e-genotype-and-sex-risk-factors-for-alzheimer-disease-a-meta-analysis
#14
Scott C Neu, Judy Pa, Walter Kukull, Duane Beekly, Amanda Kuzma, Prabhakaran Gangadharan, Li-San Wang, Klaus Romero, Stephen P Arneric, Alberto Redolfi, Daniele Orlandi, Giovanni B Frisoni, Rhoda Au, Sherral Devine, Sanford Auerbach, Ana Espinosa, Mercè Boada, Agustín Ruiz, Sterling C Johnson, Rebecca Koscik, Jiun-Jie Wang, Wen-Chuin Hsu, Yao-Liang Chen, Arthur W Toga
Importance: It is unclear whether female carriers of the apolipoprotein E (APOE) ε4 allele are at greater risk of developing Alzheimer disease (AD) than men, and the sex-dependent association of mild cognitive impairment (MCI) and APOE has not been established. Objective: To determine how sex and APOE genotype affect the risks for developing MCI and AD. Data Sources: Twenty-seven independent research studies in the Global Alzheimer's Association Interactive Network with data on nearly 58 000 participants...
August 28, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28842338/structure-proteome-and-genome-of-sinorhizobium-meliloti-phage-%C3%AE-m5-a-virus-with-luz24-like-morphology-and-a-highly-mosaic-genome
#15
Matthew C Johnson, Marta Sena-Velez, Brian K Washburn, Georgia N Platt, Stephen Lu, Tess E Brewer, Jason S Lynn, M Elizabeth Stroupe, Kathryn M Jones
Bacteriophages of nitrogen-fixing rhizobial bacteria are revealing a wealth of novel structures, diverse enzyme combinations and genomic features. Here we report the cryo-EM structure of the phage capsid at 4.9-5.7 Å-resolution, the phage particle proteome, and the genome of the Sinorhizobium meliloti-infecting Podovirus ΦM5. This is the first structure of a phage with a capsid and capsid-associated structural proteins related to those of the LUZ24-like viruses that infect Pseudomonas aeruginosa. Like many other Podoviruses, ΦM5 is a T=7 icosahedron with a smooth capsid and short, relatively featureless tail...
August 22, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28839911/the-role-of-multidisciplinary-meetings-for-benign-pancreatobiliary-diseases-a-tertiary-centre-experience
#16
Noor L H Bekkali, Sam Murray, Lesley Winter, Vinay Sehgal, George J M Webster, Michael H Chapman, Steven Bandula, Zahir Amin, Samantha Read, Stephen P Pereira, Gavin J Johnson
Multidisciplinary meetings are central to the management of chronic and complex diseases and they have become widely established across the modern healthcare. Patients with pancreatobiliary diseases can often present with complex clinical dilemmas, which fall out with the scope of current guidelines. Therefore, these patients require a personalised management approach discussed in a multidisciplinary meeting.
July 2017: Frontline Gastroenterology
https://www.readbyqxmd.com/read/28834621/isolation-of-a-phytotoxic-isocoumarin-from-diaporthe-eres-infected-hedera-helix-english-ivy-and-synthesis-of-its-phytotoxic-analogs
#17
Kumudini M Meepagala, William E Briscoe, Natascha Techen, Robert D Johnson, Brandon M Clausen, Stephen O Duke
BACKGROUND: The fungus Diaporthe eres was isolated from a fungal pathogen-infected leaf of Hedera helix (English Ivy) exhibiting necrosis. It is hypothesized that the causative fungus produces phytotoxins as evidenced by necrotic lesions on the leaves. RESULTS: The fungus was isolated and grown in Czapek Dox broth culture medium and potato dextrose broth culture medium and identified as Diaporthe eres. The ethyl acetate extracts of the culture broths were phytotoxic to lettuce (Lactuca sativa) and bentgrass (Agrostis stolonifera)...
August 23, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28821181/conservation-genetics-of-the-cheetah-lessons-learned-and-new-opportunities
#18
REVIEW
Stephen J O'Brien, Warren E Johnson, Carlos A Driscoll, Pavel Dobrynin, Laurie Marker
The dwindling wildlife species of our planet have become a cause célèbre for conservation groups, governments, and concerned citizens throughout the world. The application of powerful new genetic technologies to surviving populations of threatened mammals has revolutionized our ability to recognize hidden perils that afflict them. We have learned new lessons of survival, adaptation, and evolution from viewing the natural history of genomes in hundreds of detailed studies. A single case history of one species, the African cheetah, Acinonyx jubatus, is here reviewed to reveal a long-term story of conservation challenges and action informed by genetic discoveries and insights...
September 1, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/28812690/young-inversion-with-multiple-linked-qtls-under-selection-in-a-hybrid-zone
#19
Cheng-Ruei Lee, Baosheng Wang, Julius P Mojica, Terezie Mandáková, Kasavajhala V S K Prasad, Jose Luis Goicoechea, Nadeesha Perera, Uffe Hellsten, Hope N Hundley, Jenifer Johnson, Jane Grimwood, Kerrie Barry, Stephen Fairclough, Jerry W Jenkins, Yeisoo Yu, Dave Kudrna, Jianwei Zhang, Jayson Talag, Wolfgang Golser, Kathryn Ghattas, M Eric Schranz, Rod Wing, Martin A Lysak, Jeremy Schmutz, Daniel S Rokhsar, Thomas Mitchell-Olds
Fixed chromosomal inversions can reduce gene flow and promote speciation in two ways: by suppressing recombination and by carrying locally favoured alleles at multiple loci. However, it is unknown whether favoured mutations slowly accumulate on older inversions or if young inversions spread because they capture pre-existing adaptive quantitative trait loci (QTLs). By genetic mapping, chromosome painting and genome sequencing, we have identified a major inversion controlling ecologically important traits in Boechera stricta...
April 3, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28807570/albumin-bilirubin-grade-predicts-the-outcomes-of-liver-resection-versus-radiofrequency-ablation-for-very-early-early-stage-of-hepatocellular-carcinoma
#20
Charing Ching-Ning Chong, Anthony Wing-Hung Chan, John Wong, Cheuk-Man Chu, Stephen Lam Chan, Kit-Fai Lee, Simon Chun-Ho Yu, Ka-Fai To, Philip Johnson, Paul Bo-San Lai
BACKGROUND AND PURPOSE: Whether liver resection or ablation should be the first-line treatment for very early/early hepatocellular carcinoma (HCC) in patients who are candidates for both remains controversial. The aim of this study was to determine if the newly-developed Albumin-Bilirubin (ALBI) grade might help in treatment selections and to evaluate the survival of patients treated with liver resection and radiofrequency ablation (RFA). METHODS: Patients with BCLC stage 0/A HCC who were treated with curative liver resection and RFA from 2003 to 2013 were included...
August 11, 2017: Surgeon: Journal of the Royal Colleges of Surgeons of Edinburgh and Ireland
keyword
keyword
57159
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"