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1. Chromagar™ requires secondary confirmation strategies to minimize false positive/negative results for detection of Staphylococcus aureus

Author:
Sirobhushanam, Sirisha; Parsa, Navya; Reed, Tamra J.; Kahlenberg, J. Michelle
Source:
Journal of microbiological methods 2019 v.161 pp. 71-73
ISSN:
0167-7012
Subject:
Staphylococcus aureus,   etc   ; agar; color; microbial detection;     Show all 4 Subjects
Abstract:
... Chromagar is a medium that is used in culture-based colonization studies of Staphylococcus aureus. We have found that S. aureus negative colonies often fit the color recommendations for S. aureus identification and can cause overestimation of colonization rates. Confirmation of suspect colonies is important to minimize false negative/positive results. ...
DOI:
10.1016/j.mimet.2019.04.013

2. Enzyme-Mediated Intercellular Proximity Labeling for Detecting Cell–Cell Interactions

Author:
Ge, Yun; Chen, Long; Liu, Shibo; Zhao, Jingyi; Zhang, Heng; Chen, Peng R.
Source:
Journal of the American Chemical Society 2019 v.141 no.5 pp. 1833-1837
ISSN:
1520-5126
Subject:
Staphylococcus aureus,   etc   ; sortase A; surface proteins;     Show all 3 Subjects
Abstract:
... Cell–cell interactions and communications play fundamental roles in life processes but remain largely uncharacterized. We developed an enzyme-mediated proximity cell labeling (EXCELL) strategy as a general method to detect and record cell–cell interactions under living conditions. EXCELL relies on an evolved Staphylococcus aureus transpeptidase sortase A variant (mgSrtA) capable of promiscuous lab ...
DOI:
10.1021/jacs.8b10286

3. Quantification of Staphylococcus aureus using surface acoustic wave sensors

Author:
Xu, Zhangliang; Yuan, Yong J.
Source:
RSC advances 2019 v.9 no.15 pp. 8411-8414
ISSN:
2046-2069
Subject:
Staphylococcus aureus,   etc   ; detection limit; quartz crystal microbalance; zinc oxide;     Show all 4 Subjects
Abstract:
... Quartz crystal microbalance (QCM), surface acoustic wave (SAW)-Rayleigh and ZnO based SAW-Love sensors were fabricated and their sensitivity was comparatively analyzed for the quantification of Staphylococcus aureus (S. aureus). The SAW based sensors showed response magnitudes up to three times greater than that of the QCM sensor for the same mass loading of S. aureus. The ZnO nanoparticle-based S ...
DOI:
10.1039/c8ra09790a

4. Synthesis of the Nonribosomal Peptide Phevalin and Analogs

Author:
Ramesh, Remya; Bovino, Michael T.; Zeng, Yibin; Aubé, Jeffrey
Source:
Journal of organic chemistry 2019 v.84 no.6 pp. 3647-3651
ISSN:
1520-6904
Subject:
Staphylococcus aureus,   etc   ; chemical structure; imines; organic chemistry; oxidation; peptides;     Show all 6 Subjects
Abstract:
... Phevalin, a cyclic nonribosomal peptide produced by Staphylococcus aureus, has intriguing biological properties. A synthetic route to access phevalin and similar pyrazinone natural products tyrvalin, leuvalin, phileucin, and a few synthetic analogs is described. The reaction sequence involves a one-pot carbamate deprotection/imine formation/aerobic oxidation to form the pyrazinone-containing produ ...
DOI:
10.1021/acs.joc.8b03206

5. Oxacillin-susceptible mecA-positive Staphylococcus aureus associated with processed food in Europe

Author:
Quijada, Narciso M.; Hernández, Marta; Oniciuc, Elena-Alexandra; Eiros, José María; Fernández-Natal, Isabel; Wagner, Martin; Rodríguez-Lázaro, David
Source:
Food microbiology 2019 v.82 pp. 107-110
ISSN:
0740-0020
Subject:
methicillin-resistant Staphylococcus aureus,   etc   ; air; airports; cheeses; gene expression; genes; plasmids; processed foods; Austria;     Show all 9 Subjects
Abstract:
... We report for the first time an oxacillin-susceptible mecA-positive Staphylococcus aureus (OS-MRSA) associated with a processed food product in Europe. One isolate (MRSA-ST5-type V SCCmec) was found in cheese among 600 food samples confiscated from air passengers from international flights in Vienna Airport (Austria). Type V SCCmec strains do not harbor functional mecI-mecR1 genes and in such stra ...
DOI:
10.1016/j.fm.2019.01.021

6. A novel visual-mixed-dye for LAMP and its application in the detection of foodborne pathogens

Author:
Pang, Bo; Yao, Shuo; Xu, Kun; Wang, Juan; Song, Xiuling; Mu, Ying; Zhao, Chao; Li, Juan
Source:
Analytical biochemistry 2019 v.574 pp. 1-6
ISSN:
0003-2697
Subject:
Staphylococcus aureus,   etc   ; Vibrio parahaemolyticus; dyes; fluorescence; food pathogens; loop-mediated isothermal amplification; manganese chloride; solar radiation;     Show all 8 Subjects
Abstract:
... Loop-mediated isothermal amplification (LAMP) has been widely applied for the detection of foodborne pathogens. Obtaining a simple, accurate readout of LAMP reaction results is crucial. Herein, a visual-mixed-dye (VMD) containing calcein (precombined with MnCl2) and hydroxynaphthol blue (HNB) for LAMP end-point detection was developed. The optimal final concentrations of these components in VMD we ...
DOI:
10.1016/j.ab.2019.03.002

7. Influence of naringenin adaptation and shock on resistance of Staphylococcus aureus and Escherichia coli to pulsed electric fields

Author:
Wang, Lang-Hong; Wen, Qing-Hui; Zeng, Xin-An; Han, Zhong; Brennan, Charles S.
Source:
Lebensmittel-Wissenschaft + [i.e. und] Technologie 2019 v.107 pp. 308-317
ISSN:
0023-6438
Subject:
Staphylococcus aureus,   etc   ; Citrus; Escherichia coli; cell membranes; naringenin; pulsed electric fields; unsaturated fatty acids;     Show all 7 Subjects
Abstract:
... This work was aimed to investigate the stress induced by naringenin, one of the natural antibacterial components in citrus plants on the resistance of Staphylococcus aureus ATCC 6538 and Escherichia coli ATCC 25922 cells to pulsed electric fields (PEF). The results revealed that Staphylococcus aureus and Escherichia coli subjected to naringenin shock (2.0 h) did not significantly change their resi ...
DOI:
10.1016/j.lwt.2019.03.029

8. Influence of swabbing solution and swab type on DNA recovery from rigid environmental surfaces

Author:
You, Hee Sang; Lee, Song Hee; Ok, Yeon Jeong; Kang, Hee-Gyu; Sung, Ho Jung; Lee, Ji Yeong; Kang, Sang Sun; Hyun, Sung Hee
Source:
Journal of microbiological methods 2019 v.161 pp. 12-17
ISSN:
0167-7012
Subject:
Staphylococcus aureus,   etc   ; DNA; Escherichia coli; cotton; forensic sciences; glycerol; metagenomics; polysorbates; sampling;     Show all 9 Subjects
Abstract:
... Determination of the metagenome has become an important component of forensic identification, which requires efficient environmental sampling techniques. Therefore, in this study, we compared the efficiency of sample collection using swabbing with cotton swabs and three types of medical swabs (S7, S22, S24) along with three different solutions: phosphate-buffered saline (PBS), 1% Tween 20 + 1% gly ...
DOI:
10.1016/j.mimet.2019.04.011

9. Dissection of Protonation Sites for Antibacterial Recognition and Transport in QacA, a Multi-Drug Efflux Transporter

Author:
Majumder, Puja; Khare, Shashank; Athreya, Arunabh; Hussain, Nazia; Gulati, Ashutosh; Penmatsa, Aravind
Source:
Journal of molecular biology 2019 v.431 no.11 pp. 2163-2179
ISSN:
0022-2836
Subject:
methicillin-resistant Staphylococcus aureus,   etc   ; antibiotic resistance; antiporters; binding properties; dyes; methicillin; models; mutagenesis; mutants; protonation; protons;     Show all 11 Subjects
Abstract:
... QacA is a drug:H+ antiporter with 14 transmembrane helices that confers antibacterial resistance to methicillin-resistant Staphylococcus aureus strains, with homologs in other pathogenic organisms. It is a highly promiscuous antiporter, capable of H+-driven efflux of a wide array of cationic antibacterial compounds and dyes. Our study, using a homology model of QacA, reveals a group of six protona ...
DOI:
10.1016/j.jmb.2019.03.015

10. Use of a Stereochemical Strategy To Probe the Mechanism of Phenol-Soluble Modulin α3 Toxicity

Author:
Yao, Zhihui; Cary, Brian P.; Bingman, Craig A.; Wang, Chenxuan; Kreitler, Dale F.; Satyshur, Kenneth A.; Forest, Katrina T.; Gellman, Samuel H.
Source:
Journal of the American Chemical Society 2019 v.141 no.19 pp. 7660-7664
ISSN:
1520-5126
Subject:
Staphylococcus aureus,   etc   ; crystal structure; crystals; cytotoxicity; enantiomers; peptides; stereochemistry; virulent strains;     Show all 8 Subjects
Abstract:
... Phenol-soluble modulin α3 (PSMα3) is a cytotoxic peptide secreted by virulent strains of Staphylococcus aureus. We used a stereochemical strategy to examine the mechanism of PSMα3-mediated toxicity. One hypothesis is that PSMα3 toxicity requires fibril formation; an alternative is that toxicity is caused by soluble forms of PSMα3, possibly oligomeric. We find that the unnatural enantiomer (D resid ...
DOI:
10.1021/jacs.9b00349

11. Liposome and polymeric micelle-based delivery systems for chlorophylls: Photodamage effects on Staphylococcus aureus

Author:
Gerola, Adriana P.; Costa, Paulo F.A.; de Morais, Flávia A.P.; Tsubone, Tayana M.; Caleare, Angelo O.; Nakamura, Celso V.; Brunaldi, Kellen; Caetano, Wilker; Kimura, Elza; Hioka, Noboru
Source:
Colloids and surfaces 2019 v.177 pp. 487-495
ISSN:
0927-7765
Subject:
Staphylococcus aureus,   etc   ; bacteria; biological models; chlorophyll; metals; micelles; nanocarriers; photobleaching; photosensitizing agents; polymers; singlet oxygen;     Show all 11 Subjects
Abstract:
... Chlorophyll derivatives (Chls), loaded in F-127 polymeric micelles and DPPC liposomes as drug delivery systems (DDS), have been shown to be remarkable photosensitizers for photodynamic inactivation (PDI). Assays of photoinactivation of Staphylococcus aureus bacteria (as biological models) showed that the effectiveness of Chls in these nanocarriers is dependent on photobleaching processes, photosen ...
DOI:
10.1016/j.colsurfb.2019.02.032

12. Influenza and Staphylococcus aureus Coinfection: TLR9 at Play

Author:
Sun, Keer; Metzger, Dennis W.
Source:
Trends in microbiology 2019 v.27 no.5 pp. 383-384
ISSN:
0966-842X
Subject:
Staphylococcus aureus,   etc   ; Toll-like receptor 9; influenza; lungs; mixed infection; mortality;     Show all 6 Subjects
Abstract:
... Bacterial lung infections are frequent causes of mortality following influenza infection, but the fundamental mechanisms remain largely unknown. A new study by Martínez-Colón et al. (PLoS Pathog. 2019;15:e1007560) now suggests that influenza-induced immune suppression of Staphylococcus aureus is mediated by TLR9 signaling. ...
DOI:
10.1016/j.tim.2019.02.006

13. Low-toxicity amphiphilic molecules linked by an aromatic nucleus show broad-spectrum antibacterial activity and low drug resistance

Author:
ChuCo-first authors., Wenchao; Yang, Yi; Qin, Shangshang; Cai, Jianfeng; Bai, Mengmeng; Kong, Hongtao; Zhang, En
Source:
Chemical communications 2019 v.55 no.30 pp. 4307-4310
ISSN:
1364-548X
Subject:
methicillin-resistant Staphylococcus aureus,   etc   ; antibacterial properties; bacteria; biofilm; cell viability; chemical reactions; mammals; pathogens; surfactants; toxicity;     Show all 10 Subjects
Abstract:
... Amphiphilic molecules linked by an aromatic nucleus were developed that showed high selectivity toward bacteria over mammalian cells, and low drug resistance. A promising compound 4g exhibited strong bactericidal activity against a panel of sensitive and resistant bacteria, low toxicity, the ability to reduce cell viability in biofilms, stability in mammalian fluids, rapid killing of pathogens, an ...
DOI:
10.1039/c9cc00857h

14. Three new diphenyl ether derivatives from the fermentation products of an endophytic fungus Phomopsis fukushii

Author:
Gao, Yu-Hong; Zheng, Rui; Li, Jing; Kong, Wei-Song; Liu, Xin; Ye, Lin; Mi, Qi-Li; Kong, Wei-Song; Zhou, Min; Yang, Guang-Yu; Hu, Qiu-Fen; Du, Gang; Yang, Hai-Ying; Li, Xue-Mei
Source:
Journal of Asian natural products research 2019 v.21 no.4 pp. 316-322
ISSN:
1477-2213
Subject:
Staphylococcus aureus,   etc   ; Diaporthe; diphenyl ethers; endophytes; fermented foods; fungi; nuclear magnetic resonance spectroscopy;     Show all 7 Subjects
Abstract:
... Three new diphenyl ethers (1-3), together with four known isopentylated diphenyl ethers derivatives (4-7), were isolated from the fermentation products of an endophytic fungus Phomopsis fukushii. Their structures were elucidated by spectroscopic methods, including extensive 1D and 2D NMR techniques. Compounds 1-3 were evaluated for their anti-methicillin-resistant Staphylococcus aureus (anti-MRSA) ...
DOI:
10.1080/10286020.2017.1421177

15. An in vitro biofilm model of Staphylococcus aureus infection of bone

Author:
Sweeney, E.; Lovering, A.M.; Bowker, K.E.; MacGowan, A.P.; Nelson, S.M.
Source:
Letters in applied microbiology 2019 v.68 no.4 pp. 294-302
ISSN:
0266-8254
Subject:
Staphylococcus aureus,   etc   ; bacteria; biofilm; bioluminescence; blood serum; cattle; cell viability; daptomycin; femur; gentamicin; models; osteomyelitis; screening;     Show all 13 Subjects
Abstract:
... Chronic osteomyelitis is difficult to treat, with biofilm growth and the diffusion barrier to antibiotics presented by bone contributory factors. The aim of this study was to develop and evaluate an in vitro model of osteomyelitis. A bioluminescent strain of Staphylococcus aureus was grown in bone blocks made from bovine femur. Light output was insufficient for detection of bacterial cells within ...
DOI:
10.1111/lam.13131

16. A novel BiVO4-GO-TiO2-PANI composite for upgraded photocatalytic performance under visible light and its non-toxicity

Author:
Zhao, Jingjing; Biswas, Md Rokon Ud Dowla; Oh, Won-Chun
Source:
Environmental science and pollution research international 2019 v.26 no.12 pp. 11888-11904
ISSN:
0944-1344
Subject:
Staphylococcus aureus,   etc   ; Bacillus subtilis; irradiation; light; methylene blue; phenol; photocatalysis; photocatalysts; photolysis; toxicity testing;     Show all 10 Subjects
Abstract:
... A novel non-toxic hybrid BiVO₄-GO-TiO₂-polyaniline (PANI) (BVGT-PANI) composite with superior photocatalysis was successfully prepared via a one-pot hydrothermal reaction. The structural and morphological characterizations of the synthesized compounds were analyzed by a series of techniques. We found excellent photocatalytic efficiencies for methylene blue (MB) and phenol degradation under visible ...
DOI:
10.1007/s11356-019-04441-6

17. Fighting Staphylococcus aureus Biofilms with Monoclonal Antibodies

Author:
Raafat, Dina; Otto, Michael; Reppschläger, Kevin; Iqbal, Jawad; Holtfreter, Silva
Source:
Trends in microbiology 2019 v.27 no.4 pp. 303-322
ISSN:
0966-842X
Subject:
Staphylococcus aureus,   etc   ; antibiotics; bacteria; biofilm; clinical trials; immune system; monoclonal antibodies; pathogens; vaccination;     Show all 9 Subjects
Abstract:
... Staphylococcus aureus (S. aureus) is a notorious pathogen and one of the most frequent causes of biofilm-related infections. The treatment of S. aureus biofilms is hampered by the ability of the biofilm structure to shield bacteria from antibiotics as well as the host’s immune system. Therefore, new preventive and/or therapeutic interventions, including the use of antibody-based approaches, are ur ...
DOI:
10.1016/j.tim.2018.12.009

18. Manothermosonication: Inactivation of Escherichia coli and Staphylococcus aureus

Author:
Chantapakul, Thunthacha; Lv, Ruiling; Wang, Wenjun; Chummalee, Watcharapong; Ding, Tian; Liu, Donghong
Source:
Journal of food engineering 2019 v.246 pp. 16-24
ISSN:
0260-8774
Subject:
Staphylococcus aureus,   etc   ; Escherichia coli; bacteria; death; heat; pasteurization; sonication; temperature; viability;     Show all 9 Subjects
Abstract:
... Manothermosonication (MTS) has been one of the key alternatives to current pasteurization techniques. This study evaluates the effectiveness of the MTS system in the inactivation of two opposite gram-stained bacteria: E. coli ATCC 25922 and S. aureus ATCC 25923. Samples were treated with different conditions, including mild heat (T, 50 °C, 100 kPa), sonication (US, 30 °C, 100 kPa), thermosonicatio ...
DOI:
10.1016/j.jfoodeng.2018.10.009

19. Sensitizing of β-lactam resistance by tannic acid in methicillin-resistant S. aureus

Author:
Kırmusaoğlu, Sahra
Source:
World journal of microbiology & biotechnology 2019 v.35 no.4 pp. 57
ISSN:
0959-3993
Subject:
methicillin-resistant Staphylococcus aureus,   etc   ; antibiotic resistance; bacteria; hospitals; methicillin; minimum inhibitory concentration; synergism; tannins; toxicity;     Show all 9 Subjects
Abstract:
... Methicillin-resistant Staphylococcus aureus (MRSA) infections treatment of which is hard and failed, due to being resistant to all types of β-lactams, have been emerged in hospitals and community. Long-term usage of antibiotics and over doses of antibiotics used in the treatment of infections cause bacteria to develop resistance to antibiotics. β-lactams combined with tannic acid can be a good alt ...
DOI:
10.1007/s11274-019-2637-6

20. The dosing and monitoring of vancomycin: what is the best way forward?

Author:
Drennan, Philip G.; Begg, Evan J.; Gardiner, Sharon J.; Kirkpatrick, Carl M.J.; Chambers, Steve T.
Source:
International journal of antimicrobial agents 2019 v.53 no.4 pp. 401-407
ISSN:
0924-8579
Subject:
Staphylococcus aureus,   etc   ; adults; guidelines; intravenous injection; monitoring; nephrotoxicity; pharmacokinetics; risk; vancomycin;     Show all 9 Subjects
Abstract:
... We have evaluated the literature to review optimal dosing and monitoring of intravenous vancomycin in adults, in response to evolving understanding of targets associated with efficacy and toxicity. The area under the total concentration–time curve (0–24 h) divided by the minimum inhibitory concentration (AUC24/MIC) is the most commonly accepted index to guide vancomycin dosing for the treatment of ...
DOI:
10.1016/j.ijantimicag.2018.12.014