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Antibiotics resistence

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https://www.readbyqxmd.com/read/28823054/recent-advances-in-synthetic-lipopeptides-as-anti-microbial-agents-designs-and-synthetic-approaches
#1
REVIEW
Jun-Jie Koh, Shuimu Lin, Roger W Beuerman, Shouping Liu
Infectious diseases impose serious public health burdens and continue to be a global public health crisis. The treatment of infections caused by multidrug-resistant pathogens is challenging because only a few viable therapeutic options are clinically available. The emergence and risk of drug-resistant superbugs and the dearth of new classes of antibiotics have drawn increasing awareness that we may return to the pre-antibiotic era. To date, lipopeptides have been received considerable attention because of the following properties: They exhibit potent antimicrobial activities against a broad spectrum of pathogens, rapid bactericidal activity and have a different antimicrobial action compared with most of the conventional antibiotics used today and very slow development of drug resistance tendency...
August 19, 2017: Amino Acids
https://www.readbyqxmd.com/read/28822976/persistence-after-treatment-of-pharyngeal-gonococcal-infections-in-patients-of-the-sti-clinic-amsterdam-the-netherlands-2012-2015-a-retrospective-cohort-study
#2
I Putu Yuda Hananta, Henry John Christiaan De Vries, Alje P van Dam, Martijn Sebastiaan van Rooijen, Hardyanto Soebono, Maarten Franciscus Schim van der Loeff
INTRODUCTION: Infection of Neisseria gonorrhoeae in the pharynx (pharyngeal Ng) is associated with gonococcal transmission and development of antimicrobial resistance. We assessed proportion of and determinants for persistence after treatment of pharyngeal Ng. METHODS: At the STI clinic of Amsterdam, the Netherlands, females-at-risk and men who have sex with men are routinely screened for pharyngeal Ng using an RNA-based nucleic acid amplification test (NAAT; Aptima Combo 2)...
August 19, 2017: Sexually Transmitted Infections
https://www.readbyqxmd.com/read/28822933/occurrence-of-vibrio-species-beta-lactam-resistant-vibrio-species-and-indicator-bacteria-in-ballast-and-port-waters-of-a-tropical-harbor
#3
Charmaine Ng, Shin Giek Goh, Nazanin Saeidi, William A Gerhard, Claudia K Gunsch, Karina Yew Hoong Gin
Ballast water discharges are potential sources for the spread of invasive and pathogenic aquatic organisms. Ballast waters from six ships docked in the Port of Singapore were tested to determine if indictor organisms fell within proposed standards for ballast water discharge according to regulation D-2 of the Ballast Water Management Convention (BWMC) guidelines. Vibrio species were cultured on media supplemented with beta-lactam antibiotics to determine the presence of antibiotic resistant Vibrio species in the ballast waters of these vessels...
August 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822069/characterization-of-ofloxacin-interaction-with-mutated-a91v-quinolone-resistance-determining-region-of-dna-gyrase-in-mycobacterium-leprae-through-computational-simulation
#4
J Nisha, V Shanthi
Mycobacterium leprae, the causal agent of leprosy is non-cultivable in vitro. Thus, the assessment of antibiotic activity against Mycobacterium leprae depends primarily upon the time-consuming mouse footpad system. The GyrA protein of Mycobacterium leprae is the target of the antimycobacterial drug, Ofloxacin. In recent times, the GyrA mutation (A91V) has been found to be resistant to Ofloxacin. This phenomenon has necessitated the development of new, long-acting antimycobacterial compounds. The underlying mechanism of drug resistance is not completely known...
August 18, 2017: Cell Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28821946/quantitative-expression-analysis-of-spa-fnba-and-rsp-genes-in-staphylococcus-aureus-actively-associated-in-the-formation-of-biofilms
#5
Sthanikam Yeswanth, Abhijit Chaudhury, Potukuchi Venkata Gurunadha Krishna Sarma
In Staphylococcus aureus, adherence and secretory proteins play chief role in the formation of biofilms. This mode of growth exhibits resistance to a variety of antibiotics and spreads its infections. In the present study, secretary and adherence proteins, Protein-A, Fibronectin-binding protein-A (FnbA) and Rsp (a transcription regulator encoding proteolytic property) expression levels were evaluated at different stages of growth in S. aureus ATCC12600 a drug-sensitive strain and multidrug-resistant strains of S...
August 18, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28821784/high-copy-and-stable-expression-of-the-xylanase-xynhb-in-saccharomyces-cerevisiae-by-rdna-mediated-integration
#6
Cheng Fang, Qinhong Wang, Jonathan Nimal Selvaraj, Yuling Zhou, Lixin Ma, Guimin Zhang, Yanhe Ma
Xylanase is a widely-used additive in baking industry for enhancing dough and bread quality. Several xylanases used in baking industry were expressed in different systems, but their expression in antibiotic free vector system is highly essential and safe. In the present study, an alternative rDNA-mediated technology was developed to increase the copy number of target gene by integrating it into Saccharomyces cerevisiae genome. A xylanase-encoding gene xynHB from Bacillus sp. was cloned into pHBM367H and integrated into S...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821610/a-screen-for-kinase-inhibitors-identifies-antimicrobial-imidazopyridine-aminofurazans-as-specific-inhibitors-of-the-listeria-monocytogenes-pasta-kinase-prka
#7
Adam J Schaenzer, Nathan Wlodarchak, David H Drewry, William J Zuercher, Warren E Rose, Rob Striker, John-Demian Sauer
Bacterial signaling systems such as protein kinases and quorum sensing have become increasingly attractive targets for the development of novel antimicrobial agents in a time of rising antibiotic resistance. The family of bacterial Penicillin-binding-protein And Serine/Threonine kinase-Associated (PASTA) kinases is of particular interest due to the role of these kinases in regulating resistance to β-lactam antibiotics. As such, small-molecule kinase inhibitors that target PASTA kinases may prove beneficial as treatments adjunctive to β-lactam therapy...
August 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28821547/cultivation-in-space-flight-produces-minimal-alterations-in-the-susceptibility-of-bacillus-subtilis-cells-to-72-different-antibiotics-and-growth-inhibiting-compounds
#8
Michael D Morrison, Patricia Fajardo-Cavazos, Wayne L Nicholson
Past results have suggested that bacterial antibiotic susceptibility is altered during space flight. To test this notion, Bacillus subtilis cells were cultivated in matched hardware, medium, and environmental conditions either in spaceflight microgravity on the International Space Station, termed Flight (FL) samples, or at Earth-normal gravity, termed Ground Control (GC) samples. Susceptibility of FL and GC samples was compared to 72 antibiotics and growth-inhibitory compounds using the Omnilog Phenotype Microarray (PM) system...
August 18, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28821540/investigating-undergraduate-students-use-of-intuitive-reasoning-and-evolutionary-knowledge-in-explanations-of-antibiotic-resistance
#9
Melissa Richard, John D Coley, Kimberly D Tanner
Natural selection is a central concept throughout biology; however, it is a process frequently misunderstood. Bacterial resistance to antibiotic medications provides a contextual example of the relevance of evolutionary theory and is also commonly misunderstood. While research has shed light on student misconceptions of natural selection, minimal study has focused on misconceptions of antibiotic resistance. Additionally, research has focused on the degree to which misconceptions may be based in the complexity of biological information or in pedagogical choices, rather than in deep-seated cognitive patterns...
2017: CBE Life Sciences Education
https://www.readbyqxmd.com/read/28821529/antibiotic-susceptibility-profiles-of-ocular-and-nasal-flora-in-patients-undergoing-cataract-surgery-in-taiwan-an-observational-and-cross-sectional-study
#10
Yun-Hsuan Lin, Yu-Chuan Kang, Chiun-Ho Hou, Yhu-Chering Huang, Chih-Jung Chen, Jwu-Ching Shu, Pang-Hsin Hsieh, Ching-Hsi Hsiao
OBJECTIVE: To investigate the conjunctival and nasal flora and the antibiotic susceptibility profiles of isolates from patients undergoing cataract surgery. DESIGN: Observational and cross-sectional study. SETTING: A single-centre study in Taiwan. PARTICIPANTS: 128 consecutive patients precataract surgery. PRIMARY AND SECONDARY OUTCOME MEASURES METHODS: Conjunctival and nasal cultures were prospectively obtained from 128 patients on the day of cataract surgery before instillation of ophthalmic solutions in our hospital...
August 18, 2017: BMJ Open
https://www.readbyqxmd.com/read/28821080/investigation-of-chitosan-s-antibacterial-activity-against-vancomycin-resistant-microorganisms-and-their-biofilms
#11
Eduardo M Costa, Sara Silva, Mariana Veiga, Sandra Vicente, Freni K Tavaria, Manuela E Pintado
Vancomycin-resistant microorganisms are a hurdle that traditional antibiotics struggle to overcome. These difficulties have led to search for new solutions based on natural products. Chitosan has been recognized as an effective antibacterial agent against a vast array of microorganisms including antibiotic resistant ones. As such, this work aimed to evaluate chitosan as an alternative to traditional antibiotics in the management/control of two vancomycin-resistant microorganisms, VRSA and VREF, in planktonic and sessile settings...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821026/ultrahigh-antibacterial-efficacy-of-meropenem-loaded-chitosan-nanoparticles-in-a-septic-animal-model
#12
Ayat Abdelkader, Mohamed A El-Mokhtar, Ola Abdelkader, Mostafa A Hamad, Mahmoud Elsabahy, Omaima N El-Gazayerly
Antimicrobial resistance is one of the most significant health challenges worldwide. Meropenem is a broad spectrum beta-lactam antibiotic that possesses high activity against Gram-positive and Gram-negative bacteria. However, it has a short plasma half-life, and thus requiring frequent administration of high doses. For the first time, meropenem-loaded chitosan nanoparticles were prepared and evaluated as a potential tool to overcome antimicrobial resistance and to improve pharmacokinetics of the drug. Spherical nanosized particles were prepared and demonstrated ultrahigh encapsulation efficiency of meropenem (i...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820687/identification-of-subsets-of-enteroaggregative-escherichia-coli-associated-with-diarrheal-disease-among-under-5-year-old-children-from-rural-gambia
#13
Usman N Ikumapayi, Nadia Boisen, Mohammad J Hossain, Modupeh Betts, Modou Lamin, Debasish Saha, Brenda Kwambana-Adams, Michel Dione, Richard A Adegbola, Anna Roca, James P Nataro, Martin Antonio
Enteroaggregative Escherichia coli (EAEC) cause acute and persistent diarrhea, mostly in children worldwide. Outbreaks of diarrhea caused by EAEC have been described, including a large outbreak caused by a Shiga toxin expressing strain. This study investigated the association of EAEC virulence factors with diarrhea in children less than 5 years. We characterized 428 EAEC strains isolated from stool samples obtained from moderate-to-severe diarrhea cases (157) and healthy controls (217) children aged 0-59 months recruited over 3 years as part of the Global Enteric Multicenter Study (GEMS) in The Gambia...
August 7, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28820574/thiol-containing-metallo-%C3%AE-lactamase-inhibitors-resensitize-resistant-gram-negative-bacteria-to-meropenem
#14
Kamaleddin Haj Mohammad Ebrahim Tehrani, Nathaniel I Martin
The prevalence of infections caused by metallo-β-lactamase (MBL) expressing Gram-negative bacteria has grown at an alarming rate in recent years. Despite the fact that MBLs can deactivate virtually all β-lactams antibiotics, there are as of yet no approved drugs available that inhibit their activity. We here examine the ability of previously reported thiol-based MBL inhibitors to synergize with meropenem against a panel of Gram-negative carbapenem-resistant isolates expressing different β-lactamases. Among the compounds tested, thiomandelic acid 3 and 2-merpto-3-phenylpropionic acid 4 were found to efficiently potentiate the activity of meropenem, especially against an IMP producing strain of K...
August 18, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28820293/lacrimal-gland-abscess-in-children-two-case-reports-and-literature-review
#15
Tracy Hiu Ting Lai, Frank Hiu Ping Lai, Tommy Chung Yan Chan, Alvin Lerrmann Young, Kelvin Kam Lung Chong
Acute suppurative bacterial dacryoadenitis (ASBD) with abscess formation is rarely seen in clinical practice. A retrospective review of medical records in the past 8 years identified two unilateral cases in children, one developed presumably after methicillin-sensitive Staphylococcus aureus (MSSA) conjunctivitis and the other due to community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) infection. Computerized tomography scans showed globe indentation by the enlarged lacrimal glands with rim-enhancing lesions...
August 18, 2017: Orbit
https://www.readbyqxmd.com/read/28819794/in-vitro-selection-and-identification-of-potential-probiotics-isolated-from-the-gastrointestinal-tract-of-nile-tilapia-oreochromis-niloticus
#16
Rasha M Reda, Khaled M Selim, Hassanin M El-Sayed, M A El-Hady
Fish gut bacteria can be used as probiotics for aquaculture. The aim of this study is to screen and identify beneficial probiotic bacteria from the gut of Nile tilapia, Oreochromis niloticus. Nine out of one hundred thirty-five isolates were non-pathogenic through intraperitoneal injection and had antibacterial activities with at least a strain from the five isolated fish pathogens, Aeromonas sobria, Aeromonas hydrophila, Pseudomonas aeruginosa, Pseudomonas putida, and Staphylococcus aureus. Further tests showed that such isolates can survive in the presence of high bile concentration (10%) and at different acidic pH values...
August 17, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28819087/investigation-and-characterization-of-%C3%AE-lactam-resistance-in-escherichia-coli-strains-isolated-from-bamboo-rats-rhizomys-sinensis-in-zhejiang-province-china
#17
Hui Zhang, Kun Li, Yajing Wang, Mujeeb Ur Rehman, Yijiang Liu, Junjie Jin, Junping Peng, Fazul Nabi, Khalid Mehmood, Houqiang Luo, Jiaxiang Wang
This study was undertaken to investigate drug resistance in Escherichia coli (E. coli) strains isolated from bamboo rats in Zhejiang province of China. One hundred and fifty-four E. coli strains were isolated from dead bamboo rats. Polymerase chain reaction (PCR) was used to detect the representative genes encoding resistance to commonly used β-lactam antibiotics. Highest resistance was observed for cefradine (24.03%), followed by penicillin (20.78%) and ceftazidime (20.13%). The isolation rates of β-lactam resistance genes were 53...
August 17, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28818900/genome-sequence-of-an-australian-monophasic-salmonella-enterica-subsp-enterica-typhimurium-isolate-tw-stm6-carrying-a-large-plasmid-with-multiple-antimicrobial-resistance-genes
#18
Mike L Dyall-Smith, Yuhong Liu, Helen Billman-Jacobe
We report the genome sequence of a monophasic Salmonella enterica subsp. enterica Typhimurium strain (TW-Stm6) isolated in Australia that is similar to epidemic multidrug-resistant strains from Europe and elsewhere. This strain carries additional antibiotic and heavy-metal resistance genes on a large (275-kb) IncHI2 plasmid.
August 17, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28818804/an-on-spot-internal-standard-addition-approach-for-accurately-determining-colistin-a-and-colistin-b-in-dried-blood-spots-using-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#19
I-Lin Tsai, Ching-Hua Kuo, Hsin-Yun Sun, Yu-Chung Chuang, Divyabharathi Chepyala, Shu-Wen Lin, Yun-Jung Tsai
Outbreaks of multidrug-resistant Gram-negative bacterial infections have been reported worldwide. Colistin, an antibiotic with known nephrotoxicity and neurotoxicity, is now being used to treat multidrug-resistant Gram-negative strains. In this study, we applied an on-spot internal standard addition approach coupled with an ultra high-performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) method to quantify colistin A and B from dried blood spots (DBSs). Only 15μL of whole blood was required for each sample...
August 3, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28818651/genomic-characterization-of-a-paediatric-mrsa-outbreak-by-next-generation-sequencing
#20
Elisabetta Ugolotti, Eddi Di Marco, Roberto Bandettini, Roberto Biassoni
INTRODUCTION: Twelve strains of meticillin-resistant Staphylococcus aureus (MRSA) isolated during a suspected outbreak in a Paediatric Intensive Care Unit were analyzed by Whole Genome Sequence (WGS). AIM: To define the clonality of MRSA strains to a high discriminative power and to evaluate the presence of genetic determinants responsible for antibiotic resistance and for virulence. RESULTS: Ten out of 12 strains belonged to the MLST ST2625, while the other two were ST8...
August 14, 2017: Journal of Hospital Infection
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