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https://www.readbyqxmd.com/read/28636792/mtf-and-dqe-enhancement-using-an-apodized-aperture-x-ray-detector-design
#1
Tomi F Nano, Terenz Escartin, Elina Ismailova, Karim S Karim, Jan Lindstrȍm, Ho Kyung Kim, Ian A Cunningham
PURPOSE: Acquisition of high-quality x-ray images using low patient exposures requires detectors with high detective quantum efficiency (DQE). We describe a novel apodized-aperture pixel (AAP) design that increases high-frequency modulation transfer function (MTF) and DQE values. The AAP design makes a separation of physical sensor elements from image pixels by using very small sensor elements (e.g. 0.010-0.025 mm) to synthesize desired larger image pixels (e.g. 0.1-0.2 mm). METHODS: A cascaded systems model of signal and noise propagation is developed to describe the benefits of the AAP approach in terms of the MTF, Wiener noise power spectrum (NPS) and DQE...
June 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/28633425/androgen-receptor-mutations-in-patients-with-castration-resistant-prostate-cancer-treated-with-apalutamide
#2
D E Rathkopf, M R Smith, C J Ryan, W R Berry, N D Shore, G Liu, C S Higano, J J Alumkal, R Hauke, R F Tutrone, M Saleh, E Chow Maneval, S Thomas, D S Ricci, M K Yu, C J de Boer, A Trinh, T Kheoh, R Bandekar, H I Scher, E S Antonarakis
Background: : Mutations in the androgen receptor (AR) ligand-binding domain (LBD), such as F877L and T878A, have been associated with resistance to next-generation AR-directed therapies. ARN-509-001 was a phase I/II study that evaluated apalutamide activity in castration-resistant prostate cancer (CRPC). Here we evaluated the type and frequency of 11 relevant AR-LBD mutations in apalutamide-treated CRPC patients. Patients and methods: : Blood samples from men with non-metastatic CRPC (nmCRPC) and metastatic CRPC (mCRPC) pre- or post abiraterone acetate and prednisone (AAP) treatment (≥6 months' exposure) were evaluated at baseline and disease progression in trial ARN-509-001...
June 15, 2017: Annals of Oncology: Official Journal of the European Society for Medical Oncology
https://www.readbyqxmd.com/read/28626289/comparison-of-high-resolution-x-ray-detectors-with-conventional-fpds-using-experimental-mtfs-and-apodized-aperture-pixel-design-for-reduced-aliasing
#3
A Shankar, M Russ, S Vijayan, D R Bednarek, S Rudin
Apodized Aperture Pixel (AAP) design, proposed by Ismailova et. al, is an alternative to the conventional pixel design(1). The advantages of AAP processing with a sinc filter in comparison with using other filters include non-degradation of MTF values and elimination of signal and noise aliasing, resulting in an increased performance at higher frequencies, approaching the Nyquist frequency(3). If high resolution small field-of-view (FOV) detectors with small pixels used during critical stages of Endovascular Image Guided Interventions (EIGIs) could also be extended to cover a full field-of-view typical of flat panel detectors (FPDs) and made to have larger effective pixels, then methods must be used to preserve the MTF over the frequency range up to the Nyquist frequency of the FPD while minimizing aliasing...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28617740/academic-productivity-knowledge-and-education-in-plastic-surgery-the-benefit-of-the-clinical-research-fellow
#4
Martin J Carney, Jason M Weissler, Peter F Koltz, John P Fischer, Liza C Wu, Joseph M Serletti
Academic research productivity is limited by strenuous resident and faculty schedules, yet is imperative to the growth and success of our discipline. We report institutional experience with our clinical research fellowship model, providing two positions per year.A critical analysis of research productivity was performed for all trainees, faculty, and research fellows from 2000-2015. All articles in-print were individually collected to identify academic appointment at time of publication for the authors. Academic productivity was determined by number of peer-reviewed publications, podium presentations, and h-index...
June 14, 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28616667/fluorescence-turn-on-detection-of-alkaline-phosphatase-activity-based-on-controlled-release-of-pei-capped-cu-nanoclusters-from-mno2-nanosheets
#5
Yunyi Zhang, Yongxin Li, Cuiyun Zhang, Qingfeng Zhang, Xinan Huang, Meiding Yang, Sohail Anjum Shahzad, Kenneth Kam-Wing Lo, Cong Yu, Shichun Jiang
A fluorescence turn-on assay for alkaline phosphatase (ALP) activity is developed through the controlled release of polyethyleneimine-capped copper nanoclusters (PEI-capped CuNCs) from the MnO2 nanosheets. In an aqueous solution, the positively charged PEI-capped CuNCs could be adsorbed onto the surface of the negatively charged MnO2 nanosheets. Such adsorption through favorable electrostatic interactions could efficiently quench the nanocluster fluorescence emission via resonance energy transfer from the PEI-capped CuNCs to the MnO2 nanosheets...
June 14, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28611957/genetic-virulence-profile-of-enteroaggregative-escherichia-coli-strains-isolated-from-danish-children-with-either-acute-or-persistent-diarrhea
#6
Betina Hebbelstrup Jensen, Anja Poulsen, Stig Hebbelstrup Rye Rasmussen, Carsten Struve, Jørgen H Engberg, Alice Friis-Møller, Nadia Boisen, Rie Jønsson, Randi F Petersen, Andreas M Petersen, Karen A Krogfelt
Enteroaggregative Escherichia coli (EAEC) is frequently found in diarrheal stools worldwide. It has been associated with persistent diarrhea, weight loss, and failure to thrive in children living in developing countries. A number of important EAEC virulence genes are identified; however, their roles in acute and persistent diarrhea have not been previously investigated. The aim of this study was to identify specific EAEC virulence genes associated with duration and type of diarrhea in Danish children. We aimed to improve the current diagnostics of EAEC and enable targeting of strains with an expected severe disease course...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28609559/strategies-to-optimize-capsid-protein-expression-and-single-stranded-dna-formation-of-adeno-associated-virus-in-saccharomyces-cerevisiae
#7
Alvaro Galli, Veronica Della Latta, Caterina Bologna, Daniela Pucciarelli, Filippo Cipriani, Ana Backovic, Tiziana Cervelli
AIMS: Adeno-associated virus type 2 (AAV) is a non-pathogenic parvovirus that is a promising tool for gene therapy. We aim to construct plasmids for optimal expression and assembly of capsid proteins, and evaluate Adenovirus (Ad) protein effect on AAV single stranded DNA (ssDNA) formation in Saccharomyces cerevisiae. METHODS AND RESULTS: Yeast expression plasmids have been developed in which the transcription of AAV capsid proteins (VP1,2,3) is driven by the constitutive ADH1 promoter or galactose inducible promoters...
June 13, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28607752/enhanced-disease-reduction-using-clozapine-an-atypical-antipsychotic-agent-and-glatiramer-acetate-combination-therapy-in-experimental-autoimmune-encephalomyelitis
#8
Laura K Green, Pirooz Zareie, Nikki Templeton, Robert A Keyzers, Bronwen Connor, Anne Camille La Flamme
BACKGROUND: Atypical antipsychotic agents (AAP) alleviate the symptoms of severe mental health disorders, such as schizophrenia, by antagonizing dopamine and serotonin receptors. Recently, AAP have also been shown to exhibit immunomodulatory properties in the central nervous system (CNS). OBJECTIVE: Building on research which demonstrated the ability of the AAP risperidone and clozapine to modify the disease course of experimental autoimmune encephalomyelitis (EAE), an animal model of multiple sclerosis (MS), we aimed to more fully investigate the potential of clozapine as a possible treatment for MS...
January 2017: Multiple Sclerosis Journal—Experimental, Translational and Clinical
https://www.readbyqxmd.com/read/28606370/factors-influencing-pediatrician-retirement-a-survey-of-american-academy-of-pediatrics-chapter-members
#9
Mary E Rimsza, Holly Ruch-Ross, Harold K Simon, Thomas W Pendergass, Holly J Mulvey
OBJECTIVE: To assess the factors that may influence physicians' desire to retire through an analysis of data collected through the American Academy of Pediatrics (AAP) State Pediatrician Workforce Survey. STUDY DESIGN: An electronic survey was sent to retired and nonretired US pediatricians who held AAP membership. The respondents were asked about the importance of 12 factors that would influence or had influenced their decision to retire. The physicians who were not yet retired also were asked: "If you could afford to today, would you retire from medicine?" RESULTS: The survey was completed by 8867 pediatricians...
June 9, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/28604495/when-do-patients-return-to-physical-activities-and-athletics-after-scoliosis-surgery-a-validated-patient-questionnaire-based-study
#10
Vishal Sarwahi, Stephen Wendolowski, Rachel Gecelter, Kathleen Maguire, Melanie Gambassi, Dana Orlando, Yungtai Lo, Terry Amaral
STUDY DESIGN: A retrospective chart review with a survey OBJECTIVES.: This study seeks to determine time of return to normal, physical and athletic activities and delaying factors after all pedicle screw fixation. SUMMARY OF BACKGROUND DATA: Return to athletic activity after PSF in AIS is largely dependent on surgeon's philosophy. Some allow contact and collision sports by 6 and 12 months, while others avoid contact sports for 1 year and never allow collision sports...
June 9, 2017: Spine
https://www.readbyqxmd.com/read/28596814/enhancement-of-mitochondrial-transfer-by-antioxidants-in-human-mesenchymal-stem-cells
#11
Chia-Jung Li, Po-Kong Chen, Li-Yi Sun, Cheng-Yoong Pang
Excessive reactive oxygen species is the major component of a harsh microenvironment after ischemia/reperfusion injury in human tissues. Combined treatment of N-acetyl-L-cysteine (NAC) and L-ascorbic acid 2-phosphate (AAP) promoted the growth of human mesenchymal stem cells (hMSCs) and suppressed oxidative stress-induced cell death by enhancing mitochondrial integrity and function in vitro. In this study, we aimed to determine whether NAC and AAP (termed MCA) could enhance the therapeutic potential of hMSCs...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28593524/virulence-factors-associated-with-coagulase-negative-staphylococci-isolated-from-human-infections
#12
K R Soumya, Suja Philip, Sheela Sugathan, Jyothis Mathew, E K Radhakrishnan
Infections caused by commensal organisms by changing to infectious life style generate much challenge to the current treatment strategies. Coagulase Negative Staphylococci (CoNS) are one of them, with their coexisting biofilm forming and multiple antibiotic resistance properties form important agents of nosocomial infection. To evaluate species distribution, biofilm formation, and antibiogram, CoNS isolates from various clinical samples were isolated. The presence of biofilm and associated genes icaAB, aap, atlE, embp, bhp, and fbe in CoNS was screened by PCR...
June 2017: 3 Biotech
https://www.readbyqxmd.com/read/28591659/decreased-levels-of-matrix-metalloproteinase-2-in-root-canal-exudates-during-root-canal-treatment
#13
Kassara Pattamapun, Sira Handagoon, Thanapat Sastraruji, James L Gutmann, Prasit Pavasant, Suttichai Krisanaprakornkit
OBJECTIVE: To determine the matrix metalloproteinase-2 (MMP-2) levels in root-canal exudates from teeth undergoing root-canal treatment. MATERIAL AND METHODS: The root-canal exudates from six teeth with normal pulp and periradicular tissues that required intentional root canal treatment for prosthodontic reasons and from twelve teeth with pulp necrosis and asymptomatic apical periodontitis (AAP) were sampled with paper points for bacterial culture and aspirated for the detection of proMMP-2 and active MMP-2 by gelatin zymography and the quantification of MMP-2 levels by ELISA...
May 31, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28589859/integrative-information-theoretic-network-analysis-for-genome-wide-association-study-of-aspirin-exacerbated-respiratory-disease-in-korean-population
#14
Sehee Wang, Hyun-Hwan Jeong, Dokyoon Kim, Kyubum Wee, Hae-Sim Park, Seung-Hyun Kim, Kyung-Ah Sohn
BACKGROUND: Aspirin Exacerbated Respiratory Disease (AERD) is a chronic medical condition that encompasses asthma, nasal polyposis, and hypersensitivity to aspirin and other non-steroidal anti-inflammatory drugs. Several previous studies have shown that part of the genetic effects of the disease may be induced by the interaction of multiple genetic variants. However, heavy computational cost as well as the complexity of the underlying biological mechanism has prevented a thorough investigation of epistatic interactions and thus most previous studies have typically considered only a small number of genetic variants at a time...
May 24, 2017: BMC Medical Genomics
https://www.readbyqxmd.com/read/28573262/proposing-a-novel-three-level-definition-of-periodontitis-%C3%A2-using-probing-depth-clinical-attachment-loss-and-bleeding-on-probing-analysis-of-a-rural-chinese-population
#15
Xi Yan Pei, Lu He, Xiang Ying Ouyang
OBJECTIVE: To propose a novel, three-level (severe, moderate, mild) case definition using probing depth (PD), clinical attachment loss (CAL) and bleeding on probing (BOP) for epidemiologic studies on periodontitis. METHODS: Case definitions (DEF) 1-30 with PD, CAL and BOP were made. Based on data from epidemiologic research in Chengde (Hebei Province, China) in 1992, prevalence of periodontitis by DEF1-30 was calculated and compared with a reference (definitions by Centers for Disease Control and Prevention/American Academy of Periodontology in 2012)...
2017: Chinese Journal of Dental Research
https://www.readbyqxmd.com/read/28566932/postural-changes-in-measures-of-arterial-stiffness-in-hypertensive-subjects-on-antihypertensive-drug-therapy-a-prospective-pilot-study
#16
Ashish Anil Sule, Du Qi Jun, Chin Yee Cheong
Prospective study with a controlled arm to know if there are variations of measures of arterial stiffness with posture in subjects with hypertension on antihypertensive medications. We studied postural variations of measures of arterial stiffness in 21 subjects with diagnosed hypertension on antihypertensive medications and compared them with 21 normotensive subjects. All subjects underwent pulse-wave analysis on SphygmoCor in the morning between 8 am to 10 am initially in supine and then in sitting position after 3 minutes...
June 2017: International Journal of Angiology: Official Publication of the International College of Angiology, Inc
https://www.readbyqxmd.com/read/28557775/nonemergency-acute-care-when-it-s-not-the-medical-home
#17
Gregory P Conners, Susan J Kressly, James M Perrin, Julia E Richerson, Usha M Sankrithi
The American Academy of Pediatrics (AAP) affirms that the optimal location for children to receive care for acute, nonemergency health concerns is the medical home. The medical home is characterized by the AAP as a care model that "must be accessible, family centered, continuous, comprehensive, coordinated, compassionate, and culturally effective." However, some children and families use acute care services outside the medical home because there is a perceived or real benefit related to accessibility, convenience, or cost of care...
May 2017: Pediatrics
https://www.readbyqxmd.com/read/28552244/ca-2-signalling-underlying-pancreatitis
#18
REVIEW
J V Gerasimenko, S Peng, T Tsugorka, O V Gerasimenko
In spite of significant scientific progress in recent years, acute pancreatitis (AP) is still a dangerous and in up to 5% of cases deadly disease with no specific cure. It is self-resolved in the majority of cases, but could result in chronic pancreatitis (CP) and increased risk of pancreatic cancer (PC). One of the early events in AP is premature activation of digestive pro-enzymes, including trypsinogen, inside pancreatic acinar cells (PACs) due to an excessive rise in the cytosolic Ca(2+) concentration, which is the result of Ca(2+) release from internal stores followed by Ca(2+) entry through the store operated Ca(2+) channels in the plasma membrane...
May 18, 2017: Cell Calcium
https://www.readbyqxmd.com/read/28548904/utilization-of-a-patient-centered-asthma-passport-tool-in-a-subspecialty-clinic
#19
Jonathan Greenberg, Olga Prushinskaya, Joshua D Harris, Gillian Guidetti-Myers, Jacqueline Steiding, Gregory S Sawicki, Jonathan M Gaffin
INTRODUCTION: Despite available and effective tools for asthma self-assessment (Asthma Control Test, ACT) and self-management (Asthma Action Plan, AAP), they are underutilized in outpatient specialty clinics. We evaluated the impact of a patient-centered checklist, the Asthma Passport, on improving ACT and AAP utilization in clinic. METHODS: This was a randomized, interventional quality-improvement project in which the Asthma Passport was distributed to 120 pediatric asthma patients over the duration of 16 weeks...
May 26, 2017: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/28535139/otitis-media-with-effusion-our-national-practice
#20
Rachel E Roditi, Richard M Rosenfeld, Jennifer J Shin
Otitis media with effusion (OME) is the focus of an updated multidisciplinary clinical practice guideline published by the American Academy of Otolaryngology-Head and Neck Surgery Foundation (AAO-HNSF) and the American Academy of Pediatrics (AAP). Based on data from clinical trials, the guideline recommends against using antihistamines, antibiotics, oral steroids, and intranasal steroids for OME. To understand practice patterns related to these guidelines, we assessed nationally representative data. Despite controlling for age, sex, race/ethnicity, and other potential confounders individualized for each medication class, an increased risk of antihistamine (odds ratio [OR], 3...
April 1, 2017: Otolaryngology—Head and Neck Surgery
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