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https://www.readbyqxmd.com/read/28429754/real-time-detection-of-tsunami-ionospheric-disturbances-with-a-stand-alone-gnss-receiver-a-preliminary-feasibility-demonstration
#1
Giorgio Savastano, Attila Komjathy, Olga Verkhoglyadova, Augusto Mazzoni, Mattia Crespi, Yong Wei, Anthony J Mannucci
It is well known that tsunamis can produce gravity waves that propagate up to the ionosphere generating disturbed electron densities in the E and F regions. These ionospheric disturbances can be studied in detail using ionospheric total electron content (TEC) measurements collected by continuously operating ground-based receivers from the Global Navigation Satellite Systems (GNSS). Here, we present results using a new approach, named VARION (Variometric Approach for Real-Time Ionosphere Observation), and estimate slant TEC (sTEC) variations in a real-time scenario...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28421309/genetic-makeup-of-shiga-toxin-producing-escherichia-coli-in-relation-to-clinical-symptoms-and-duration-of-shedding-a-microarray-analysis-of-isolates-from-swedish-children
#2
A Matussek, C Jernberg, I-M Einemo, S Monecke, R Ehricht, I Engelmann, S Löfgren, S Mernelius
Shiga toxin (Stx)-producing Escherichia coli (STECs) cause non-bloody diarrhea, hemorrhagic colitis, and hemolytic uremic syndrome, and are the primary cause of acute renal failure in children worldwide. This study investigated the correlation of genetic makeup of STEC strains as revealed by DNA microarray to clinical symptoms and the duration of STEC shedding. All STEC isolated (n = 96) from patients <10 years of age in Jönköping County, Sweden from 2003 to 2015 were included. Isolates were characterized by DNA microarray, including almost 280 genes...
April 19, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28419995/hemolytic-uremic-syndrome-and-kidney-transplantation-a-case-series-and-review-of-the-literature
#3
Sabrina Milan Manani, Grazia Maria Virzì, Anna Giuliani, Anna Clementi, Alessandra Brocca, Daniela Dissegna, Francesca Martino, Emanuele Stefano Giovanni d'Amore, Claudio Ronco
BACKGROUND: Hemolytic uremic syndrome (HUS) can be triggered by Shiga toxin producing Escherichia coli (STEC) infection or it can be defined as atypical HUS (aHUS) if it is related to uncontrolled complement activation. aHUS is characterized by a high incidence of recurrence after kidney transplantation, and it can also occur de novo in transplant recipients. Eculizumab is used both to prevent and to treat aHUS following kidney transplantation. In this paper, we report our centre experience and we present 4 cases of HUS in patients who underwent kidney transplantation...
April 19, 2017: Nephron
https://www.readbyqxmd.com/read/28416508/hus-and-atypical-hus
#4
T Sakari Jokiranta
Hemolytic uremic syndrome (HUS) is a thrombotic microangiopathy characterized by intravascular hemolysis, thrombocytopenia, and acute kidney failure. HUS is usually categorized as typical, caused by shiga-toxin producing E. coli (STEC) infection, atypical HUS (aHUS), usually caused by uncontrolled complement activation, or secondary HUS with a coexisting disease. In recent years, a general understanding of the pathogenetic mechanisms driving HUS has increased. Typical (i.e. STEC-HUS) follows a gastrointestinal infection with STEC, while aHUS is associated primarily with mutations or autoantibodies leading to dysregulated complement activation...
April 17, 2017: Blood
https://www.readbyqxmd.com/read/28414257/spiral-plating-method-to-quantify-the-six-major-non-o157-escherichia-coli-serogroups-in-cattle-feces
#5
Pragathi B Shridhar, Lance W Noll, Charley A Cull, Xiaorong Shi, Natalia Cernicchiaro, David G Renter, Jianfa Bai, T G Nagaraja
Cattle are a major reservoir of the six major Shiga toxin-producing non-O157 Escherichia coli (STEC) serogroups (O26, O45, O103, O111, O121, and O145) responsible for foodborne illnesses in humans. Besides prevalence in feces, the concentrations of STEC in cattle feces play a major role in their transmission dynamics. A subset of cattle, referred to as super shedders, shed E. coli O157 at high concentrations (≥4 log CFU/g of feces). It is not known whether a similar pattern of fecal shedding exists for non-O157...
April 17, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28411228/day-to-day-dynamics-of-commensal-escherichia-coli-in-zimbabwean-cows-evidence-temporal-fluctuations-within-a-host-specific-population-structure
#6
Méril Massot, Camille Couffignal, Olivier Clermont, Camille D'Humières, Jérémie Chatel, Nicolas Plault, Antoine Andremont, Alexandre Caron, France Mentré, Erick Denamur
To get insights in the temporal pattern of commensal Escherichia coli populations, we daily sampled feces of four healthy cows from the same herd over 25 days, in the Hwange district of Zimbabwe. The cows did not receive antibiotic treatment during the 3 previous months. We performed viable E. coli counts, and characterized at a clonal level, screened for stx and eae genes, and tested for antibiotic susceptibilities the 326 isolates originating from the 98 sampled stools. We observed that E. coli counts and dominant clones were different among cows, and very few clones were shared...
April 14, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28406080/genome-amplification-and-promoter-mutation-expand-the-range-of-csgd-dependent-biofilm-responses-in-an-stec-population
#7
Gaylen A Uhlich, Chin-Yi Chen, Bryan J Cottrell, Elisa Andreozzi, Peter L Irwin, Ly-Huong Nguyen
Expression of the major biofilm components of E. coli, curli fimbriae and cellulose, requires the CsgD transcription factor. A complex regulatory network allows environmental control of csgD transcription and biofilm formation. However, most clinical serotype O157 : H7 strains contain prophage insertions in the csgD regulator, mlrA, or mutations in other regulators that restrict csgD expression. These barriers can be circumvented by certain compensating mutations that restore higher csgD expression. One mechanism is via csgD promoter mutations that switch sigma factor utilization...
April 13, 2017: Microbiology
https://www.readbyqxmd.com/read/28402187/detection-and-isolation-of-the-top-seven-shiga-toxin-producing-escherichia-coli-in-ground-beef-comparison-of-rapidfinder-kits-to-the-u-s-department-of-agriculture-microbiology-laboratory-guidebook-method
#8
Pina M Fratamico, Lori K Bagi, Aisha Abdul-Wakeel
Shiga toxin-producing Escherichia coli (STEC) O157:H7 and serogroups O26, O45, O103, O111, O121, and O145 are often referred to as the "top seven" STEC, and these have been declared to be adulterants in beef by the U.S. Department of Agriculture (USDA) Food Safety and Inspection Service (FSIS). The aim of this work was to compare the methods described in the USDA FSIS Microbiology Laboratory Guidebook (MLG) to a two-stage Applied Biosystems RapidFinder STEC real-time PCR method to test for the top seven STEC in raw ground beef...
April 12, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28400860/multiple-etiologies-of-infectious-diarrhea-and-concurrent-infections-in-a-pediatric-outpatient-based-screening-study-in-odisha-india
#9
Arpit Kumar Shrivastava, Subrat Kumar, Nirmal Kumar Mohakud, Mrutyunjay Suar, Priyadarshi Soumyaranjan Sahu
BACKGROUND: There are multiple etiologies responsible for infectious gastroenteritis causing acute diarrhea which are often under diagnosed. Also acute diarrhea is one of the major causes of morbidity and mortality among children less than 5 years of age. METHODS: In our study, fecal samples (n = 130) were collected from children (<5 years) presenting with symptoms of acute diarrhea. Samples were screened for viral, bacterial, and parasitic etiologies. Rotavirus and Adenovirus were screened by immunochromatographic tests...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28399273/house-flies-in-the-confined-cattle-environment-carry-non-o157-shiga-toxin-producing-escherichia-coli
#10
R Puri-Giri, A Ghosh, J L Thomson, L Zurek
Cattle manure is one of the primary larval developmental habitats of house flies, Musca domestica (L.). Cattle serve as asymptomatic reservoirs of Shiga toxin-producing Escherichia coli (STEC), and bacteria are released into the environment in cattle feces. The USDA-FSIS declared seven STEC serogroups (O157, O26, O45, O103, O145, O121, and O111) as adulterants in beef products. In addition, the serogroup O104 was a culprit of a large outbreak in Germany in 2011. Our study aimed to assess the prevalence of seven non-O157 STEC (O26, O45, O145, O103, O121, O111, and O104) serogroups in adult house flies...
March 3, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28399144/microbial-quality-of-agricultural-water-in-central-florida
#11
Zeynal Topalcengiz, Laura K Strawn, Michelle D Danyluk
The microbial quality of water that comes into the edible portion of produce is believed to directly relate to the safety of produce, and metrics describing indicator organisms are commonly used to ensure safety. The US FDA Produce Safety Rule (PSR) sets very specific microbiological water quality metrics for agricultural water that contacts the harvestable portion of produce. Validation of these metrics for agricultural water is essential for produce safety. Water samples (500 mL) from six agricultural ponds were collected during the 2012/2013 and 2013/2014 growing seasons (46 and 44 samples respectively, 540 from all ponds)...
2017: PloS One
https://www.readbyqxmd.com/read/28391537/virulence-factors-of-shiga-toxin-producing-escherichia-coli-and-the-risk-of-developing-haemolytic-uraemic-syndrome-in-norway-1992-2013
#12
U Naseer, I Løbersli, M Hindrum, T Bruvik, L T Brandal
Shiga toxin-producing Escherichia coli (STEC) may cause haemolytic uraemic syndrome (HUS). Age ≤5 years and presence of stx2a and eae are risk factors for the development of HUS. In this study, we investigated STEC isolates for the presence of adhesins, toxins and molecular risk assessment (MRA) factors to identify virulence genes associated with HUS development. We included non-duplicate isolates from all STEC infections (n = 340, HUS = 32) reported to the Norwegian National Reference Laboratory (NRL) for Enteropathogenic Bacteria from 1992 to 2013...
April 8, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28391416/serum-cyclophilin-a-correlates-with-increased-tissue-mmp-9-in-patients-with-ulcerative-colitis-but-not-with-crohn-s-disease
#13
Aleksandra Piechota-Polanczyk, Marcin Włodarczyk, Aleksandra Sobolewska-Włodarczyk, Mateusz Jonakowski, Andrzej Pilarczyk, Krystyna Stec-Michalska, Maria Wiśniewska-Jarosińska, Jakub Fichna
BACKGROUND: Cyclophilin A (CyPA) is an immunomodulatory protein, high expression of which correlates with poor outcome of patients with inflammatory diseases. However, its role in inflammatory bowel disease (IBD) has not been studied. AIM: This study analyzes the correlation between cyclophilin A, matrix metalloproteinase (MMP)-9, and tissue inhibitor of MMP (TIMP)/MMP-9 complexes in the inflamed and non-inflamed colon mucosa of UC and CD patients. METHODS: Serum and biopsy specimens from inflamed and non-inflamed colonic mucosa of 38 patients with IBD (19 with UC and 19 with CD) and 16 controls were included in our study...
April 8, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28389899/degradation-and-inactivation-of-shiga-toxins-by-nitrogen-gas-plasma
#14
Akikazu Sakudo, Yuichiro Imanishi
Shiga toxin (Stx)-producing Escherichia coli (STEC) leads to food poisoning by causing hemorrhagic colitis and hemolytic uremic syndrome. Some STEC produce Shiga toxin 1 (Stx1) and/or Shiga toxin 2 (Stx2), a relatively stable protein toxin, necessitating the development of an efficient inactivation method. Here we applied a nitrogen gas plasma apparatus to the inactivation of Stx. Samples of Stx1 and Stx2 were treated with a nitrogen gas plasma generated by a plasma device using a short high-voltage pulse applied by a static induction thyristor power supply at 1...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28389880/role-of-climate-in-the-spread-of-shiga-toxin-producing-escherichia-coli-infection-among-children
#15
Fiorella Acquaotta, Gianluigi Ardissino, Simona Fratianni, Michela Perrone
Haemolytic-uraemic syndrome (HUS) is a rare disease mainly affecting children that develops as a complication of shiga toxin-producing Escherichia coli (STEC) infection. It is characterised by acute kidney injury, platelet consumption and mechanical destruction of red blood cells (haemolysis). In order to test the working hypothesis that the spread of the infection is influenced by specific climatic conditions, we analysed all of the identified cases of infection occurring between June 2010 and December 2013 in four provinces of Lombardy, Italy (Milano, Monza Brianza, Varese and Brescia), in which a STEC surveillance system has been developed as part of a preventive programme...
April 7, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28387984/practical-issues-in-using-eculizumab-for-children-with-atypical-hemolytic-uremic-syndrome-in-the-acute-phase-a-review-of-4-patients
#16
Chikako Terano, Kenji Ishikura, Riku Hamada, Yasuhiro Yoshida, Wataru Kubota, Yusuke Okuda, Shunsuke Shinozuka, Ryoko Harada, Sunao Iyoda, Yoshihiro Fujimura, Yuko Hamasaki, Hiroshi Hataya, Masataka Honda
AIM: Recently eculizumab, a monoclonal antibody to C5, was found to improve the disease course of atypical hemolytic uremic syndrome (aHUS) and has been recommended as the first line treatment by an international consensus guideline. However, several practical issues in the use of eculizumab for the acute phase of aHUS have yet to be resolved. METHODS: Children who received eculizumab with diagnosis of aHUS between March 2010 and December 2015 at Tokyo Metropolitan Children's Medical Center were enrolled...
April 7, 2017: Nephrology
https://www.readbyqxmd.com/read/28381114/evaluation-of-applicability-of-dna-microarray-based-characterization-of-bovine-shiga-toxin-producing-escherichia-coli-isolates-using-whole-genome-sequence-analysis
#17
Stefanie A Barth, Christian Menge, Inga Eichhorn, Torsten Semmler, Derek Pickard, Lutz Geue
We assessed the ability of a commercial DNA microarray to characterize bovine Shiga toxin-producing Escherichia coli (STEC) isolates and evaluated the results using in silico hybridization of the microarray probes within whole genome sequencing scaffolds. From a total of 69,954 reactions (393 probes with 178 isolates), 68,706 (98.2%) gave identical results by DNA microarray and in silico probe hybridization. Results were more congruent when detecting the genoserotype (209 differing results from 19,758 in total; 1...
April 1, 2017: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/28377748/evidence-for-contemporary-switching-of-the-o-antigen-gene-cluster-between-shiga-toxin-producing-escherichia-coli-strains-colonizing-cattle
#18
Lutz Geue, Christian Menge, Inga Eichhorn, Torsten Semmler, Lothar H Wieler, Derek Pickard, Christian Berens, Stefanie A Barth
Shiga toxin-producing Escherichia coli (STEC) comprise a group of zoonotic enteric pathogens with ruminants, especially cattle, as the main reservoir. O-antigens are instrumental for host colonization and bacterial niche adaptation. They are highly immunogenic and, therefore, targeted by the adaptive immune system. The O-antigen is one of the most diverse bacterial cell constituents and variation not only exists between different bacterial species, but also between individual isolates/strains within a single species...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28372594/rs10887800-renalase-gene-polymorphism-influences-the-level-of-circulating-renalase-in-patients-undergoing-hemodialysis-but-not-in-healthy-controls
#19
Anna Stec
BACKGROUND: Human renalase (RNLS), a recently identified flavoprotein with oxidoreductase activity, is secreted into blood by kidneys and metabolizes circulating catecholamines. Recent studies have revealed that common polymorphisms in RNLS gene might affect the risk of several cardiovascular conditions in hemodialyzed patients. However, the exact mechanism underlying this link remains unclear. The study aims to investigate the association between RNLS gene polymorphisms and plasma renalase level in ESKD patients undergoing hemodialysis (HD group) and healthy controls (HC)...
April 3, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28363985/structure-and-dynamics-of-the-liver-receptor-homolog-1-pgc1%C3%AE-complex
#20
Suzanne G Mays, C Denise Okafor, Micheal L Tuntland, Richard J Whitby, Venkatasubramanian Dharmarajan, Jozef Stec, Patrick R Griffin, Eric A Ortlund
Peroxisome proliferator-activated gamma coactivator 1-α (PGC1α) regulates energy metabolism by directly interacting with transcription factors to modulate gene expression. Among the PGC1α binding partners is Liver receptor homolog 1 (LRH-1; NR5A2), an orphan nuclear hormone receptor that controls lipid and glucose homeostasis. Although PGC1α is known to bind and activate LRH-1, mechanisms through which PGC1α changes LRH-1 conformation to drive transcription are unknown. Here, we used biochemical and structural methods to interrogate the LRH-1-PGC1α complex...
March 31, 2017: Molecular Pharmacology
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