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https://www.readbyqxmd.com/read/28340492/hemolysis-elevated-liver-enzymes-low-platelets-syndrome-superimposed-on-hemolytic-uremic-syndrome
#1
Inês Martins, Madalena Gomes Conceição, Paulo Pereira Gomes, Nuno Clode
A pregnancy complicated by typical hemolytic uremic syndrome (HUS) and hemolysis, elevated liver enzymes, low platelets (HELLP) syndrome is reported. At 20 weeks of gestation, a case of HUS was diagnosed, with Shiga toxin-producing Escherichia coli identified. Plasmapheresis allowed continuation of the pregnancy for 5 weeks. Superimposed preeclampsia and HELLP syndrome were diagnosed after the establishment of nephrotic range proteinuria, hypertension and recurrence of hemolysis. This is a singular case, as it demonstrates that HELLP syndrome can superimpose upon HUS, a fact that can impact future research on reproductive immunology...
March 24, 2017: Revista Brasileira de Ginecologia e Obstetrícia
https://www.readbyqxmd.com/read/28340252/urinary-tract-infection-recent-insight-into-the-evolutionary-arms-race-between-uropathogenic-escherichia-coli-and-our-immune-system
#2
Sebastian Schwab, Katarzyna Jobin, Christian Kurts
Urinary tract infections (UTIs) are among the most common bacterial infections worldwide. Humans evolved various immune-dependent and independent defense mechanisms, while pathogens evolved multiple virulence factors to fight back. This article summarizes recent findings regarding the arms race between hosts and pathogens in UTIs. It was recently reported that macrophage subsets regulate neutrophil-mediated defense in primary UTIs but seem to subvert adaptive immunity upon re-infection. Moreover, some bacterial strains can survive inside macrophages, leading to recurrent infections...
March 15, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28340243/finite-time-parametric-identification-for-the-model-representing-the-metabolic-and-genetic-regulatory-effects-of-sequential-aerobic-respiration-and-anaerobic-fermentation-processes-in-escherichia-coli
#3
Alfonso Sepúlveda-Gálvez, Jesús Agustín Badillo-Corona, Isaac Chairez
Mathematical modelling applied to biological systems allows for the inferring of changes in the dynamic behaviour of organisms associated with variations in the environment. Models based on ordinary differential equations are most commonly used because of their ability to describe the mechanisms of biological systems such as transcription. The disadvantage of using this approach is that there is a large number of parameters involved and that it is difficult to obtain them experimentally. This study presents an algorithm to obtain a finite-time parameter characterization of the model used to describe changes in the metabolic behaviour of Escherichia coli associated with environmental changes...
March 17, 2017: Mathematical Medicine and Biology: a Journal of the IMA
https://www.readbyqxmd.com/read/28339845/expanded-spectrum-%C3%AE-lactamase-producing-escherichia-coli-isolated-from-chickens-with-colibacillosis-in-egypt
#4
D A El-Shazly, S A Nasef, F F Mahmoud, Daniel Jonas
Throughout the world, expanded spectrum β-lactamases (ESBL) are increasing among clinical isolates of Enterobacteriaceae, both in humans and animals. Unfortunately, there is a paucity of data on ESBL or Ampicillin class C β-lactamase (AmpC) in Egypt, although antimicrobial consumption is high in this developing country. This study aims to characterize the resistance mechanisms to expanded spectrum cephalosporins among resistant veterinary Escherichia coli isolates in Egypt. We investigated 50 clinical multi-resistant E...
February 23, 2017: Poultry Science
https://www.readbyqxmd.com/read/28339688/an-activity-staining-method-on-filtration-paper-enables-high-throughput-screening-of-temperature-sensitive-and-inactive-mutations-of-rice-%C3%AE-amylase-for-improvement-of-rice-grain-quality
#5
Hiromoto Yamakawa, Rieko Hirai-Kimura, Yuriko Nakata, Masaru Nakata, Masaharu Kuroda, Takeshi Yamaguchi
α-Amylase is a starch-hydrolyzing enzyme (EC 3.2.1.1) indispensable for germination of cereal seeds, but it is also expressed during the ripening stage. Previous studies demonstrated that the enzyme is activated in developing rice seeds under extremely hot weather and triggers a loss of grain quality by hindering the accumulation of storage starch in the endosperm. Since inactive or, preferably, heat-labile α-amylases are preferable for breeding premium rice, we developed a method for rapid screening of inactive and temperature-sensitive mutants of the enzyme by combining the random mutagenesis by error-prone PCR and an on-filter activity test of the recombinant enzyme expressed by Escherichia coli...
February 21, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28339675/high-reported-rates-of-antimicrobial-resistance-in-indian-neonatal-and-pediatric-blood-stream-infections
#6
Dhanya Dharmapalan, Anita Shet, Vijay Yewale, Mike Sharland
Background.: There is real shortage of national data on antimicrobial resistance rates in Indian neonates and children. A descriptive review was conducted to determine the patterns of antimicrobial resistance in isolates of blood stream infection among hospitalized children in India. Methods.: Published and gray literature on antibiotic resistance in children was searched using "Google Scholar", "Scopus", and "PubMed" databases between January 2000 and July 2015...
February 18, 2017: Journal of the Pediatric Infectious Diseases Society
https://www.readbyqxmd.com/read/28339623/the-molecular-and-clinical-epidemiology-of-extended-spectrum-cephalosporin-and-carbapenem-resistant-enterobacteriaceae-at-4-us-pediatric-hospitals
#7
Danielle M Zerr, Scott J Weissman, Chuan Zhou, Matthew P Kronman, Amanda L Adler, Jessica E Berry, Jaipreet Rayar, Jeff Myers, Wren L Haaland, Carey-Ann D Burnham, Alexis Elward, Jason Newland, Rangaraj Selvarangan, Kaede V Sullivan, Theoklis Zaoutis, Xuan Qin
Objective.: In this report, we aim to describe the epidemiology of extended-spectrum cephalosporin-resistant (ESC-R) and carbapenem-resistant (CR) Enterobacteriaceae infections in children. Methods.: ESC-R and CR Enterobacteriaceae isolates from normally sterile sites of patients aged <22 years from 4 freestanding pediatric medical centers were collected along with the associated clinical data. Results.: The overall frequencies of ESC-R and CR isolates according to hospital over the 4-year study period ranged from 0...
January 19, 2017: Journal of the Pediatric Infectious Diseases Society
https://www.readbyqxmd.com/read/28339520/efficacy-of-bacillus-subtilis-and-bacitracin-methylene-disalicylate-on-growth-performance-digestibility-blood-metabolites-immunity-and-intestinal-microbiota-after-intramuscular-inoculation-with-escherichia-coli-in-broilers
#8
M Manafi, S Khalaji, M Hedayati, N Pirany
This experiment was conducted to evaluate the effect of Bacillus subtilis (BS) on broiler performance and health after intramuscular inoculation with E. coli and compare its effect with a growth promoter antibiotic. In a completely randomized design manner, 360 male Ross 308 chicks were divided into 6 treatments and 5 replicates of 12 chicks in each replicate. Experimental treatments included control diet, control + E. coli (0.5 mL of culture containing 108 CFU of E. coli/ml), control + 0.1% BS, control + 0...
October 6, 2016: Poultry Science
https://www.readbyqxmd.com/read/28339294/rapid-assessment-of-antimicrobial-resistance-prevalence-using-a-lot-quality-assurance-sampling-approach
#9
Frank van Leth, Casper den Heijer, Mariëlle Beerepoot, Ellen Stobberingh, Suzanne Geerlings, Constance Schultsz
AIM: Increasing antimicrobial resistance (AMR) requires rapid surveillance tools, such as Lot Quality Assurance Sampling (LQAS). MATERIALS & METHODS: LQAS classifies AMR as high or low based on set parameters. We compared classifications with the underlying true AMR prevalence using data on 1335 Escherichia coli isolates from surveys of community-acquired urinary tract infection in women, by assessing operating curves, sensitivity and specificity. RESULTS: Sensitivity and specificity of any set of LQAS parameters was above 99% and between 79 and 90%, respectively...
March 24, 2017: Future Microbiology
https://www.readbyqxmd.com/read/28335589/global-functional-analysis-of-butanol-sensitive-escherichia-coli-and-its-evolved-butanol-tolerant-strain
#10
Haeyoung Jeong, Seung-Won Lee, Sun Hong Kim, Eun-Youn Kim, Sinyeon Kim, Sung Ho Yoon
Butanol is a promising alternative to ethanol and is desirable for use in transportation fuels and additives to gasoline and diesel fuels. Microbial production of butanol is challenging primarily due to its toxicity and low titer of production. Herein, we compared the transcriptome and phenome of wild-type Escherichia coli and its butanol-tolerant evolved strain to understand the global cellular physiology and metabolism responsible for butanol tolerance. When the ancestral butanol-sensitive E. coli was exposed to butanol, gene activities involved in respiratory mechanisms and oxidative stress were highly perturbed...
March 24, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28335539/abundance-of-pathogenic-escherichia-coli-virulence-associated-genes-in-well-and-borehole-water-used-for-domestic-purposes-in-a-peri-urban-community-of-south-africa
#11
Akebe Luther King Abia, Lisa Schaefer, Eunice Ubomba-Jaswa, Wouter Le Roux
In the absence of pipe-borne water, many people in Africa, especially in rural communities, depend on alternative water sources such as wells, boreholes and rivers for household and personal hygiene. Poor maintenance and nearby pit latrines, however, lead to microbial pollution of these sources. We evaluated the abundance of Escherichia coli and the prevalence of pathogenic E. coli virulence genes in water from wells, boreholes and a river in a South African peri-urban community. Monthly samples were collected between August 2015 and November 2016...
March 20, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28335438/the-food-production-environment-and-the-development-of-antimicrobial-resistance-in-human-pathogens-of-animal-origin
#12
REVIEW
Manjusha Lekshmi, Parvathi Ammini, Sanath Kumar, Manuel F Varela
Food-borne pathogens are a serious human health concern worldwide, and the emergence of antibiotic-resistant food pathogens has further confounded this problem. Once-highly-efficacious antibiotics are gradually becoming ineffective against many important pathogens, resulting in severe treatment crises. Among several reasons for the development and spread of antimicrobial resistance, their overuse in animal food production systems for purposes other than treatment of infections is prominent. Many pathogens of animals are zoonotic, and therefore any development of resistance in pathogens associated with food animals can spread to humans through the food chain...
March 14, 2017: Microorganisms
https://www.readbyqxmd.com/read/28335363/antimicrobial-antioxidant-and-anticancer-activities-of-biosynthesized-silver-nanoparticles-using-marine-algae-ecklonia-cava
#13
Jayachandran Venkatesan, Se-Kwon Kim, Min Suk Shim
Green synthesis of silver nanoparticles (AgNPs) has gained great interest as a simple and eco-friendly alternative to conventional chemical methods. In this study, AgNPs were synthesized by using extracts of marine algae Ecklonia cava as reducing and capping agents. The formation of AgNPs using aqueous extract of Ecklonia cava was confirmed visually by color change and their surface plasmon resonance peak at 418 nm, measured by UV-visible spectroscopy. The size, shape, and morphology of the biosynthesized AgNPs were observed by transmission electron microscopy and dynamic light scattering analysis...
December 6, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335299/synthesis-of-sic-ag-cellulose-nanocomposite-and-its-antibacterial-activity-by-reactive-oxygen-species-generation
#14
Andrzej Borkowski, Tomasz Cłapa, Mateusz Szala, Arkadiusz Gąsiński, Marek Selwet
We describe the synthesis of nanocomposites, based on nanofibers of silicon carbide, silver nanoparticles, and cellulose. Silver nanoparticle synthesis was achieved with chemical reduction using hydrazine by adding two different surfactants to obtain a nanocomposite with silver nanoparticles of different diameters. Determination of antibacterial activity was based on respiration tests. Enzymatic analysis indicates oxidative stress, and viability testing was conducted using an epifluorescence microscope. Strong bactericidal activity of nanocomposites was found against bacteria Escherichia coli and Bacillus cereus, which were used in the study as typical Gram-negative and Gram-positive bacteria, respectively...
September 13, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335265/green-synthesis-of-hierarchically-structured-silver-polymer-nanocomposites-with-antibacterial-activity
#15
María Jesús Hortigüela, Luis Yuste, Fernando Rojo, Inmaculada Aranaz
The in situ formation of silver nanoparticles (AgNPs) aided by chondroitin sulfate and the preparation of a hierarchically structured silver-polymer nanocomposite with antimicrobial activity is shown. Green synthesis of AgNPs is carried out by thermal treatment (80 and 90 °C) or UV irradiation of a chondroitin sulfate solution containing AgNO₃ without using any further reducing agents or stabilizers. Best control of the AgNPs size and polydispersity was achieved by UV irradiation. The ice-segregation-induced self-assembly (ISISA) process, in which the polymer solution containing the AgNPs is frozen unidirectionally, and successively freeze-drying were employed to produce the chondroitin sulfate 3D scaffolds...
July 25, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335205/photosensitizer-embedded-polyacrylonitrile-nanofibers-as-antimicrobial-non-woven-textile
#16
Sarah L Stanley, Frank Scholle, Jiadeng Zhu, Yao Lu, Xiangwu Zhang, Xingci Situ, Reza A Ghiladi
Toward the objective of developing platform technologies for anti-infective materials based upon photodynamic inactivation, we employed electrospinning to prepare a non-woven textile comprised of polyacrylonitrile nanofibers embedded with a porphyrin-based cationic photosensitizer; termed PAN-Por((+)). Photosensitizer loading was determined to be 34.8 nmol/mg material; with thermostability to 300 °C. Antibacterial efficacy was evaluated against four bacteria belonging to the ESKAPE family of pathogens (Staphylococcus aureus; vancomycin-resistant Enterococcus faecium; Acinetobacter baumannii; and Klebsiella pneumonia), as well as Escherichia coli...
April 20, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335201/size-and-shape-dependent-antibacterial-studies-of-silver-nanoparticles-synthesized-by-wet-chemical-routes
#17
Muhammad Akram Raza, Zakia Kanwal, Anum Rauf, Anjum Nasim Sabri, Saira Riaz, Shahzad Naseem
Silver nanoparticles (AgNPs) of different shapes and sizes were prepared by solution-based chemical reduction routes. Silver nitrate was used as a precursor, tri-sodium citrate (TSC) and sodium borohydride as reducing agents, while polyvinylpyrrolidone (PVP) was used as a stabilizing agent. The morphology, size, and structural properties of obtained nanoparticles were characterized by scanning electron microscopy (SEM), UV-visible spectroscopy (UV-VIS), and X-ray diffraction (XRD) techniques. Spherical AgNPs, as depicted by SEM, were found to have diameters in the range of 15 to 90 nm while lengths of the edges of the triangular particles were about 150 nm...
April 15, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335198/gold-nanoparticles-an-efficient-antimicrobial-agent-against-enteric-bacterial-human-pathogen
#18
Shahzadi Shamaila, Noshin Zafar, Saira Riaz, Rehana Sharif, Jawad Nazir, Shahzad Naseem
Enteric bacterial human pathogens, i.e., Escherichia coli, Staphylococcus aureus, Bacillus subtilis and Klebsiella pneumoniae, are the major cause of diarrheal infections in children and adults. Their structure badly affects the human immune system. It is important to explore new antibacterial agents instead of antibiotics for treatment. This project is an attempt to explain how gold nanoparticles affect these bacteria. We investigated the important role of the mean particle size, and the inhibition of a bacterium is dose-dependent...
April 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334975/apricot-an-integrated-computational-pipeline-for-the-sequence-based-identification-and-characterization-of-rna-binding-proteins
#19
Malvika Sharan, Konrad U Förstner, Ana Eulalio, Jörg Vogel
RNA-binding proteins (RBPs) have been established as core components of several post-transcriptional gene regulation mechanisms. Experimental techniques such as cross-linking and co-immunoprecipitation have enabled the identification of RBPs, RNA-binding domains (RBDs) and their regulatory roles in the eukaryotic species such as human and yeast in large-scale. In contrast, our knowledge of the number and potential diversity of RBPs in bacteria is poorer due to the technical challenges associated with the existing global screening approaches...
March 2, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28334932/ribosome-dependent-vibrio-cholerae-mrnase-higb2-is-regulated-by-a-%C3%AE-strand-sliding-mechanism
#20
San Hadži, Abel Garcia-Pino, Sarah Haesaerts, Dukas Jurenas, Kenn Gerdes, Jurij Lah, Remy Loris
Toxin-antitoxin (TA) modules are small operons involved in bacterial stress response and persistence. higBA operons form a family of TA modules with an inverted gene organization and a toxin belonging to the RelE/ParE superfamily. Here, we present the crystal structures of chromosomally encoded Vibrio cholerae antitoxin (VcHigA2), toxin (VcHigB2) and their complex, which show significant differences in structure and mechanisms of function compared to the higBA module from plasmid Rts1, the defining member of the family...
February 28, 2017: Nucleic Acids Research
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