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https://www.readbyqxmd.com/read/28527253/-prevalence-of-mycobacterium-tuberculosis-resistance-to-quinolones-and-injectables-in-colombia-2012-2013
#1
Claudia Llerena, Angie Zabaleta, Angélica Valbuena, Martha Murcia
INTRODUCTION: Tuberculosis is a health problem worldwide. The World Health Organization estimated 9.6 million new cases and 480,000 multirresistant cases for 2014. The assessment of resistance to quinolones and injectables was implemented only a few years ago, so its prevalence is not known. OBJECTIVE: To determine the prevalence of resistance to amikacin, capreomycin and ofloxacin in cases of tuberculosis resistant to isoniazid and/or rifampin during 2012-2013...
January 24, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/28521744/determination-of-the-sources-and-antimicrobial-resistance-patterns-of-salmonella-isolated-from-the-poultry-industry-in-southern-ethiopia
#2
Reta Duguma Abdi, Fisseha Mengstie, Ashenafi Feyisa Beyi, Takele Beyene, Hika Waktole, Bedasso Mammo, Dinka Ayana, Fufa Abunna
BACKGROUND: Ethiopia set an ambitious masterplan to increase chicken meat and egg production from 2015 to 2020. Poultry breeding, multiplication and distribution centers in the country have received executive order to import, amplify and distribute commercial chickens to end users. The biosecurity and the pathogen fauna of the centers have not been evaluated as to whether the centers could implement the mission effectively without any risk. Thus, the aim of this study was to evaluate the biosecurity practices and the pathogen prevalence, risk factors and their antimicrobial resistance (AMR) using Salmonella as case study...
May 18, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28510781/5-azacytidine-mediated-reactivation-of-silenced-transgenes-in-potato-solanum-tuberosum-at-the-whole-plant-level
#3
Dimitrij Tyč, Eva Nocarová, Lenka Sikorová, Lukáš Fischer
Transient 5-azacytidine treatment of leaf explants from potato plants with transcriptionally silenced transgenes allows de novo regeneration of plants with restored transgene expression at the whole plant level. Transgenes introduced into plant genomes frequently become silenced either at the transcriptional or the posttranscriptional level. Transcriptional silencing is usually associated with DNA methylation in the promoter region. Treatments with inhibitors of maintenance DNA methylation were previously shown to allow reactivation of transcriptionally silenced transgenes in single cells or tissues, but not at the whole plant level...
May 16, 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/28500800/first-insight-into-the-fluoroquinolone-and-aminoglycoside-resistance-of-multidrug-resistant-mycobacterium-tuberculosis-in-saudi-arabia
#4
Bright Varghese, Sahal Al-Hajoj
AbstractIn Saudi Arabia, there were no nationwide screening studies conducted so far to determine the aminoglycoside and fluoroquinolone resistance among multidrug-resistant tuberculosis (MDR-TB) isolates. Therefore, as the first attempt in the country, a retrospective analysis has been conducted on a nationwide collection of 2,956 M. tuberculosis clinical isolates screened with phenotypic drug susceptibility testing to define MDR-TB. Enrolled MDR-TB isolates were subjected to second-line drug susceptibility testing, detection of mutations conferring resistance to aminoglycosides and fluoroquinolone, followed by 24-loci mycobacterial interspersed repetitive unit-variable number of tandem repeat typing and spoligotyping...
May 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28500482/improved-yield-of-high-molecular-weight-hyaluronic-acid-production-in-a-stable-strain-of-streptococcus-zooepidemicus-via-the-elimination-of-the-hyaluronidase-encoding-gene
#5
Navid Pourzardosht, Mohammad Javad Rasaee
Despite the significant potential of Streptococcus zooepidemicus for hyaluronic acid (HA) production with high molecular weight (MW), the HA degrading properties of hyaluronidase prevents the bacteria to achieve enhanced HA yield with high MW. In the present study, we aim to knockout the hyaluronidase enzyme and assess its effects on the yield and MW of the produced HA. The kanamycin resistance gene between the left and right arms of hyaluronidase gene was inserted into pUC18 plasmid to construct pUC18-L-kana(r)-R as a recombinant suicide plasmid...
May 12, 2017: Molecular Biotechnology
https://www.readbyqxmd.com/read/28486671/elucidation-of-mycobacterium-abscessus-aminoglycoside-and-capreomycin-resistance-by-targeted-deletion-of-three-putative-resistance-genes
#6
Anna Rominski, Petra Selchow, Katja Becker, Juliane K Brülle, Michael Dal Molin, Peter Sander
Objectives: Mycobacterium abscessus is innately resistant to a variety of drugs thereby limiting therapeutic options. Bacterial resistance to aminoglycosides (AGs) is conferred mainly by AG-modifying enzymes, which often have overlapping activities. Several putative AG-modifying enzymes are encoded in the genome of M. abscessus . The aim of this study was to investigate the molecular basis underlying AG resistance in M. abscessus . Methods: M. abscessus deletion mutants deficient in one of three genes potentially involved in AG resistance, aac(2 ' ) , eis1 and eis2 , were generated by targeted gene inactivation, as were combinatorial double and triple deletion mutants...
May 9, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28486078/characterization-of-clinically-isolated-antibiotic-resistant-salmonella-typhimurium-exposed-to-subinhibitory-concentrations-of-ceftriaxone-and-ciprofloxacin
#7
Jeongjin Kim, Juhee Ahn
This study was designed mainly to assess the phenotypic properties of clinically isolated Salmonella Typhimurium exposed to ceftriaxone and ciprofloxacin. The antibiotic susceptibility, β-lactamase activity, efflux activity, bacterial motility, biofilm-forming ability, and gene expression were determined in S. Typhimurium ATCC 19585 and S. Typhimurium CCARM 8009 when exposed to subinhibitory concentrations of ceftriaxone and ciprofloxacin. S. Typhimurium CCARM 8009 was highly resistant to ampicillin, kanamycin, penicillin G, and streptomycin, showing minimum inhibitory concentration values of more than 512 μg/ml, while S...
May 9, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28479746/cloning-and-over-expression-of-non-coding-rna-rpra-in-e-coli-and-its-resistance-to-kanamycin-without-osmotic-shock
#8
Azita Sahni, Mohammadreza Hajjari, Jamshid Raheb, Ali Mohammad Foroughmand, Morteza Asgari
Recent reports have indicated that small RNAs have key roles in the response of the E.coli to stress and also in the regulating of virulence factors. It seems that some small non-coding RNAs are involved in multidrug resistance. Previous studies have indicated that rprA can increase the tolerance to Kanamycin in RcsB-deficient Escherichia coli K-12 following osmotic shock. The current study aims to clone and over-express the non-coding RNA rprA in E.coli and investigate its effect on the bacterial resistance to Kanamycin without any osmotic shock...
2017: Bioinformation
https://www.readbyqxmd.com/read/28476992/actinobacterial-mediated-synthesis-of-silver-nanoparticles-and-their-activity-against-pathogenic-bacteria
#9
Magdalena Wypij, Patrycja Golinska, Hanna Dahm, Mahendra Rai
In this study, silver nanoparticles (AgNPs) were biosynthesised by using acidophilic actinobacterial SH11 strain isolated from pine forest soil. Isolate SH11 was identified based on 16S rRNA gene sequence to Streptomyces kasugaensis M338-M1(T) and S. celluloflavus NRRL B-2493(T) (99.8% similarity, both). Biosynthesised AgNPs were analysed by UV-visible spectroscopy, which revealed specific peak at λ = 420 nm. Transmission electron microscopy analyses showed polydispersed, spherical nanoparticles with a mean size of 13...
April 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28476914/antimicrobial-susceptibility-in-neisseria-gonorrhoeae-isolates-from-five-sentinel-surveillance-sites-in-zimbabwe-2015-2016
#10
Ahmed S Latif, Lovemore Gwanzura, Anna Machiha, Francis Ndowa, Andrew Tarupiwa, Muchaneta Gudza-Mugabe, Fungai D Shukusho, Christine Chakanyuka Musanhu, Teodora Wi, Magnus Unemo
OBJECTIVES: Gonorrhoea and antimicrobial resistance (AMR) in Neisseria gonorrhoeae are major public health concerns worldwide. Enhanced AMR surveillance for gonococci is essential globally. In Zimbabwe, very limited gonococcal AMR data were reported. Our aims were to (i) implement quality-assured gonococcal AMR surveillance in Zimbabwe and (ii) investigate gonococcal AMR at five health centres in 2015-2016. METHODS: Gonococcal isolates from 104 men with urethral discharge were tested for susceptibility to kanamycin, ceftriaxone, cefixime, ciprofloxacin and azithromycin using Etest...
May 5, 2017: Sexually Transmitted Infections
https://www.readbyqxmd.com/read/28476773/genome-stability-in-engineered-strains-of-the-extremely-thermophilic-lignocellulose-degrading-bacterium-caldicellulosiruptor-bescii
#11
Amanda M Williams-Rhaesa, Farris L Poole, Jessica T Dinsmore, Gina L Lipscomb, Gabriel M Rubinstein, Israel M Scott, Jonathan M Conway, Laura L Lee, Piyum A Khatibi, Robert M Kelly, Michael W W Adams
Caldicellulosiruptor bescii is the most thermophilic cellulose-degrader known and is of great interest because of its ability to degrade non-pretreated plant biomass. For biotechnological applications, an efficient genetic system is required to engineer it to convert plant biomass into desired products. To date, two different genetically-tractable lineages of C. bescii strains have been generated. The first (JWCB005) is based on a random deletion within the pyrimidine biosynthesis genes pyrFA, and the second (MACB1018) is based on the targeted deletion of pyrE making use of a kanamycin resistance marker...
May 5, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28475419/antimicrobial-constituents-of-peel-and-seeds-of-camu-camu-myrciaria-dubia
#12
Tai Kaneshima, Takao Myoda, Kazuki Toeda, Takane Fujimori, Makoto Nishizawa
Various antimicrobial constituents of camu-camu fruit were isolated. Acylphloroglucinol (compound 1) and rhodomyrtone (compound 2) were isolated from the peel of camu-camu (Myrciaria dubia) fruit, while two other acylphloroglucinols (compounds 3 and 4) were obtained from camu-camu seeds. The structures of the isolated compounds were characterized by spectrophotometric methods. Compounds 1 and 4 were confirmed to be new acylphloroglucinols with different substituents at the C7 or C9 position of 2, and were named myrciarone A and B, respectively...
May 5, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28472671/the-complete-genome-sequence-of-streptomyces-autolyticus-cgmcc-0516-the-producer-of-geldanamycin-autolytimycin-reblastatin-and-elaiophylin
#13
Min Yin, Mingxing Jiang, Zhen Ren, Yilong Dong, Tao Lu
Streptomyces autolyticus CGMCC 0516 produces the anti-tumor benzoquinone ansamycins geldanamycin, autolytimycin, and reblastatin and the 16-membered macrodiolide elaiophylin. Here, we report the complete genome sequence of S. autolyticus CGMCC 0516, which consists of a 10,029,028bp linear chromosome and seven circular plasmids. Fifty-seven putative biosynthetic gene clusters for secondary metabolites were found. The geldanamycin, autolytimycin, and reblastatin biosynthetic gene clusters were located on the left arm (2...
May 2, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28470080/genetic-characterisation-of-antimicrobial-resistance-and-virulence-genes-in-i-staphylococcus-aureus-i-isolated-from-commercial-broiler-chickens-in-the-durban-metropolitan-area-south-africa
#14
Nelisiwe Mkize, Oliver T Zishiri, Samson Mukaratirwa
Antimicrobial resistance of Staphylococcus aureus in human and veterinary medicine is a serious worldwide problem. The aim of this study was to investigate the prevalence of S. aureus in commercial broiler chickens as well as to establish antimicrobial susceptibility and the distribution of genetic determinants conferring resistance and virulence. One hundred and ninety-four samples were aseptically collected from broiler chicken slaughterhouses and retail outlets around the Durban metropolitan area in South Africa...
May 4, 2017: Journal of the South African Veterinary Association
https://www.readbyqxmd.com/read/28454589/prevalence-and-antimicrobial-resistance-profile-of-staphylococcus-in-dairy-farms-abattoir-and-humans-in-addis-ababa-ethiopia
#15
Takele Beyene, Halefom Hayishe, Fikru Gizaw, Ashenafi Feyisa Beyi, Fufa Abunna, Bedaso Mammo, Dinka Ayana, Hika Waktole, Reta Duguma Abdi
BACKGROUND: Staphylococcus species cause mastitis and wound infection in livestock and food poisoning in humans through ingestion of contaminated foods, including meat and dairy products. They are evolving pathogens in that they readily acquire drug resistance, and multiple drug-resistant (MDR) isolates are increasing in human and veterinary healthcare. Therefore, this study was conducted to evaluate the prevalence of Staphylococci and their drug resistance in dairy farms and abattoir settings of Addis Ababa...
April 28, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28454567/patterns-and-predictors-of-antimicrobial-resistance-among-staphylococcus-spp-from-canine-clinical-cases-presented-at-a-veterinary-academic-hospital-in-south-africa
#16
Daniel N Qekwana, James W Oguttu, Fortune Sithole, Agricola Odoi
BACKGROUND: Antimicrobial resistance in staphylococci, often associated with treatment failure, is increasingly reported in veterinary medicine. The aim of this study was to investigate patterns and predictors of antimicrobial resistance among Staphylococcus spp. isolates from canine samples submitted to the bacteriology laboratory at the University of Pretoria academic veterinary hospital between 2007 and 2012. Retrospective data of 334 Staphylococcus isolates were used to calculate the proportion of samples resistant to 15 antimicrobial agents...
April 28, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28451946/using-phenotype-microarrays-in-the-assessment-of-the-antibiotic-susceptibility-profile-of-bacteria-isolated-from-wastewater-in-on-site-treatment-facilities
#17
Łukasz Jałowiecki, Joanna Chojniak, Elmar Dorgeloh, Berta Hegedusova, Helene Ejhed, Jörgen Magnér, Grażyna Płaza
The scope of the study was to apply Phenotype Biolog MicroArray (PM) technology to test the antibiotic sensitivity of the bacterial strains isolated from on-site wastewater treatment facilities. In the first step of the study, the percentage values of resistant bacteria from total heterotrophic bacteria growing on solid media supplemented with various antibiotics were determined. In the untreated wastewater, the average shares of kanamycin-, streptomycin-, and tetracycline-resistant bacteria were 53, 56, and 42%, respectively...
April 27, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28443084/gene-expression-profiling-of-transcription-factors-of-helicobacter-pylori-under-different-environmental-conditions
#18
Miguel A De la Cruz, Miguel A Ares, Kristine von Bargen, Leonardo G Panunzi, Jessica Martínez-Cruz, Hilda A Valdez-Salazar, César Jiménez-Galicia, Javier Torres
Helicobacter pylori is a Gram-negative bacterium that colonizes the human gastric mucosa and causes peptic ulcers and gastric carcinoma. H. pylori strain 26695 has a small genome (1.67 Mb), which codes for few known transcriptional regulators that control bacterial metabolism and virulence. We analyzed by qRT-PCR the expression of 16 transcriptional regulators in H. pylori 26695, including the three sigma factors under different environmental conditions. When bacteria were exposed to acidic pH, urea, nickel, or iron, the sigma factors were differentially expressed with a particularly strong induction of fliA...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28414941/endo-symbiont-mediated-synthesis-of-gold-nanobactericides-and-their-activity-against-human-pathogenic-bacteria
#19
Baker Syed, Nagendra Prasad M N, Mohan Kumar K, Dhananjaya B L, Sreedharamurthy Satish
Synthesis of gold nanobactericides (AuNBs) were achieved by treating 1mM chloroaurate with cell free supernatant of Aneurinibacillus migulanus. Formation of AuNBs was initially was monitored with change in colour to ruby red. Further confirmation was assessed with UV-visible spectra with maximum absorption occurring at 510nm. Transmission electron microscopy (TEM) analysis revealed the polydispersity of AuNBs with size distribution ranging from 10 to 60nm with an average size of 30nm. Crystalline nature was studied using X-ray diffraction which exhibited characteristic peaks indexed to Bragg's reflection at 2θ angle which confers (111), (200), (220), and (311) planes suggesting AuNBs were face-centred cubic...
March 27, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28408267/population-pharmacokinetics-of-moxifloxacin-cycloserine-p-aminosalicylic-acid-and-kanamycin-for-the-treatment-of-multi-drug-resistant-tuberculosis
#20
Min Jung Chang, Byunghak Jin, Jung-Woo Chae, Hwi-Yeol Yun, Eun Sun Kim, Yeon Joo Lee, Young-Jae Cho, Ho Il Yoon, Choon-Taek Lee, Kyoung Un Park, Junghan Song, Jae-Ho Lee, Jong Sun Park
Control of multi-drug-resistant tuberculosis (MDR-TB) requires extensive, supervised chemotherapy because second-line anti-TB drugs have a narrower therapeutic range than first-line drugs. This study aimed to develop population pharmacokinetic (PK) models for second-line drugs in patients with MDR-TB, evaluate the recommended dosage regimens and, if necessary, suggest new dosage regimens. A prospective, single-centre PK study was performed on second-line anti-TB drugs in patients with MDR-TB. Moxifloxacin, cycloserine, p-aminosalicylic acid (PAS), kanamycin and other second-line drugs were administered to the patients...
June 2017: International Journal of Antimicrobial Agents
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