keyword
MENU ▼
Read by QxMD icon Read
search

Biofilm

keyword
https://www.readbyqxmd.com/read/28646799/tracking-the-activity-of-the-anammox-damo-process-using-excitation-emission-matrix-eem-fluorescence-spectroscopy
#1
Yong-Ze Lu, Na Li, Zhao-Wei Ding, Liang Fu, Ya-Nan Bai, Guo-Ping Sheng, Raymond J Zeng
Coupling of anaerobic ammonium oxidation (anammox) and denitrifying anaerobic methane oxidation (DAMO) microorganisms in a hollow-fiber membrane biofilm reactor (HfMBR) is a potential strategy for simultaneous anaerobic removal of nitrogen and methane in wastewater streams. In these systems, effluents contain dissolved organic substances from anammox and DAMO microorganisms, but their characteristics and relationships have not been investigated. In the present study, excitation-emission matrix (EEM) fluorescence spectroscopy was used to characterize effluent dissolved organic matter (EfDOM) from an Anammox-DAMO HfMBR...
June 14, 2017: Water Research
https://www.readbyqxmd.com/read/28646780/sem-eds-and-optical-microscopy-analyses-of-microplastics-in-ocean-trawl-and-fish-guts
#2
Zhong-Min Wang, Jeff Wagner, Sutapa Ghosal, Gagandeep Bedi, Stephen Wall
Microplastic particles from Atlantic and Pacific Ocean trawls, lab-fed fish guts and ocean fish guts have been characterized using optical microscopy and SEM/EDS in terms of size, morphology, and chemistry. We assessed whether these measurements could serve as a rapid screening process for subsequent identification of the likely microplastic candidates by micro-spectroscopy. Optical microscopy enabled morphological classification of the types of particles or fibers present in the sample, as well as the quantification of particle size ranges and fiber lengths...
June 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28646746/variable-spontaneous-mutation-rate-in-clinical-strains-of-multidrug-resistant-acinetobacter-baumannii-and-differentially-expressed-proteins-in-a-hypermutator-strain
#3
Morteza Karami-Zarandi, Masoumeh Douraghi, Behrouz Vaziri, Habibeh Adibhesami, Mohammad Rahbar, Mehdi Yaseri
BACKGROUND: The emergence of multidrug resistant Acinetobacter baumannii within hospitals poses a significant threat to patients. The inherent rate of mutation of these strains has not been described nor has the mechanism by which drug resistance arises. METHODS: Here, we determined the spontaneous mutation rates in 93 clinical strains of A. baumannii using fluctuation analysis. To rule out the clonal relatedness of hypermutator strains, pulsed-field gel electrophoresis (PFGE) was conducted...
June 8, 2017: Mutation Research
https://www.readbyqxmd.com/read/28646205/comparative-nanouplc-ms-e-analysis-between-magainin-i-susceptible-and-resistant-escherichia-coli-strains
#4
Marlon H Cardoso, Keyla C de Almeida, Elizabete de S Cândido, André M Murad, Simoni C Dias, Octávio L Franco
In recent years the antimicrobial peptides (AMPs) have been prospected and designed as new alternatives to conventional antibiotics. Indeed, AMPs have presented great potential toward pathogenic bacterial strains by means of complex mechanisms of action. However, reports have increasingly emerged regarding the mechanisms by which bacteria resist AMP administration. In this context, we performed a comparative proteomic study by using the total bacterial lysate of magainin I-susceptible and -resistant E. coli strains...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28645160/chronic-pseudomonas-aeruginosa-biofilm-infection-impairs-murine-s100a8-a9-and-neutrophil-effector-cytokines-implications-for-delayed-wound-closure
#5
Hannah Trøstrup, Christian Johann Lerche, Lars Jackie Christophersen, Kim Thomsen, Peter Østrup Jensen, Hans Petter Hougen, Niels Høiby, Claus Moser
The impact of Pseudomonas aeruginosa biofilm infections in chronic wounds and clinical implication for healing is receiving increased attention. However, the pathophysiology of host/pathogen interplay is not fully understood. By further revealing the mechanisms, necessary new treatment strategies may be identified. Since the background for chronic wounds is diverse, representative animal models are important. We assessed host response and spontaneous wound closure in the relatively resistant C3H/HeN and the susceptible BALB/c mouse strain...
June 22, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28644912/biofilm-formation-and-disinfectant-resistance-of-salmonella-spp-in-mono-and-dual-species-with-pseudomonas-aeruginosa
#6
Xinyi Pang, Yishan Yang, Hyun-Gyun Yuk
AIMS: This study aimed to evaluate the biofilm formation and disinfectant resistance of Salmonella cells in mono- and dual-species biofilms with Pseudomonas aeruginosa, and to investigate the role of extracellular polymeric substances (EPS) in protection of biofilms against disinfection treatment. METHODS AND RESULTS: The populations of Salmonella in mono- or dual-species biofilms with P. aeruginosa on stainless steel (SS) coupons were determined before and after exposure to commercial disinfectant, 50 μg ml(-1) chlorine or 200 μg ml(-1) Ecolab(®) Whisper(™) V (a blend of four effective quaternary ammonium compounds)...
June 23, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28644896/how-fast-is-a-collective-bacterial-state-established
#7
Mikkel Lindstrøm Sørensen, Peter Dahl, Thomas Sams
Bacteria in a biofilm colony have the capacity to monitor the size and growth conditions for the colony and modify their phenotypical behaviour to optimise attacks, defence, migration, etc. The quorum sensing systems controlling this involve production and sensing of diffusive signal molecules. Frequently, quorum sensing systems carry a positive feedback loop which produces a switch at a threshold size of the colony. This all-or-none switch can be beneficial to create a sudden attack, leaving a host little time to establish a defence...
2017: PloS One
https://www.readbyqxmd.com/read/28644529/reciprocal-cooperation-of-phytochemicals-and-micronutrients-against-typical-and-atypical-forms-of-borrelia-spp
#8
Anna Goc, Alexandra Niedzwiecki, Matthias Rath
AIMS: Borrelia spp., a causative pathogenic factor of Lyme disease, has become a major public health threat. Current treatments based on antibiotics often lead to relapse after their withdrawal. Naturally derived substances that could work synergistically to display higher efficacy compared to the individual components may serve as a resource for the development of novel approaches to combat both active and latent forms of Borrelia spp. METHODS AND RESULTS: Using checkerboard assay, we investigated the anti-borreliae reciprocal cooperation of phytochemicals and micronutrients against two species of Borrelia selected as prevalent causes of Lyme disease in the US and Europe...
June 23, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28643906/in-vitro-evaluation-of-surface-properties-of-pro-seal-%C3%A2-and-opal-%C3%A2-seal-tm-in-preventing-white-spot-lesions
#9
T S Premaraj, N Rohani, D Covey, S Premaraj
OBJECTIVES: To evaluate the surface properties of two commercially available sealants (Pro Seal(®) (PS) and Opal(®) Seal(TM) (OS)) in terms of fluoride(F) release, biofilm formation of Streptococcus mutans and Lactobacillus and the ability to resist acid penetration. SETTING: University of Nebraska Medical Center. MATERIAL & METHODS: Discs of similar diameter and thickness were made from OS and PS. Discs were soaked in double-distilled water, and F released was measured with fluoride meter daily for 14 consecutive days, then at 21 and 28 days...
June 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28643413/effects-of-sodium-chloride-on-heat-resistance-oxidative-susceptibility-motility-biofilm-and-plaque-formation-of-burkholderia-pseudomallei
#10
Pornpan Pumirat, Muthita Vanaporn, Usa Boonyuen, Nitaya Indrawattana, Amporn Rungruengkitkun, Narisara Chantratita
Burkholderia pseudomallei is an environmental saprophyte and the causative agent of melioidosis, a severe infectious disease prevalent in tropical areas, including southeast Asia and northern Australia. In Thailand, the highest incidence of melioidosis is in the northeast region, where saline soil and water are abundant. We hypothesized that B. pseudomallei develops an ability to thrive in saline conditions and gains a selective ecological advantage over other soil-dwelling microorganisms. However, little is known about how an elevated NaCl concentration affects survival and adaptive changes in this pathogen...
June 23, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28643380/microscopy-visualisation-confirms-multi-species-biofilms-are-ubiquitous-in-diabetic-foot-ulcers
#11
Khalid Johani, Matthew Malone, Slade Jensen, Iain Gosbell, Hugh Dickson, Honhua Hu, Karen Vickery
Increasing evidence within the literature has identified the presence of biofilms in chronic wounds and proposed that they contribute to delayed wound healing. This research aimed to investigate the presence of biofilm in diabetic foot ulcers (DFUs) using microscopy and molecular approaches and define if these are predominantly mono- or multi-species. Secondary objectives were to correlate wound observations against microscopy results in ascertaining if clinical cues are useful in detecting wound biofilm. DFU tissue specimens were obtained from 65 subjects...
June 23, 2017: International Wound Journal
https://www.readbyqxmd.com/read/28643291/-more-than-expectorant-new-scientific-data-on-ambroxol-in-the-context-of-the-treatment-of-bronchopulmonary-diseases
#12
Manuel Plomer, Justus de Zeeuw
BACKGROUND: Ambroxol has been established for decades in the treatment of acute and chronic respiratory diseases. In 2015, the European Medicines Agency reassessed the clinical benefit-risk ratio of the drug. OBJECTIVE: What new scientific data on ambroxol, which are relevant to the treatment of bronchopulmonary diseases, are available? METHOD: The review is based on a systematic literature research in medline with the search term "ambroxol" during the publication period 2006-2015...
June 2017: MMW Fortschritte der Medizin
https://www.readbyqxmd.com/read/28643122/symbiotic-performance-and-induction-of-systemic-resistance-against-cercospora-sojina-in-soybean-plants-co-inoculated-with-bacillus-sp-chep5-and-bradyrhizobium-japonicum-e109
#13
María Laura Tonelli, C Magallanes-Noguera, A Fabra
Soybean is an economically very important crop throughout the word and particularly in Argentina. Soybean yield may be affected by many factors such as the lack of some essential nutrients or pathogens attack. In this work we demonstrated that the co-inoculation of the native biocontrol bacterium Bacillus sp. CHEP5 which induces resistance against Cercospora sojina in soybean and the nitrogen fixing strain Bradyrhizobium japonicum E109, was more effective in reducing frog leaf spot severity than the inoculation of the biocontrol agent alone...
June 22, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28643098/-importance-of-wound-irrigation-solutions-and-fluids-with-antiseptic-effects-in-therapy-and-prophylaxis-update-2017
#14
REVIEW
Christian Willy, Catharina Scheuermann-Poley, Marcus Stichling, Thomas von Stein, Axel Kramer
INTRODUCTION: Despite the use of modern antibiotics as well as complex perioperative, intraoperative and postoperative prophylactic measures, the rate of surgical site infections (SSI) could not be significantly reduced. The introduction of biocompatible antiseptic drugs with a high microbiocidal effect provided a successful alternative for infection prevention and therapy, particularly in a time of increasing occurrence of multi-drug resistant pathogens. Hence, questions about the risk-benefit ratio of antiseptic wound irrigation solutions, the prophylactic use of wound irrigation solutions for the reduction of SSI and the effect of negative pressure wound therapy combined with instillation (NPWTi) need to be answered...
June 22, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28643095/-local-antibiotic-therapy
#15
REVIEW
Klaus-Dieter Kühn, Nora Renz, Andrej Trampuz
The treatment of superficial wound infections with local antibiotics is considered to be problematic as it is accompanied by an increased risk of resistance development and ineffectiveness in deeper regions. On the contrary, the local application of antibiotics is useful in arthroplasty and necessary if implants are utilized. The reason for this is the prevention of a rapid biofilm formation on foreign implants and a resulting infection may remain undiscovered until it becomes chronic. Apart from exogenous material, necrotic tissue (e...
June 22, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28642776/regulation-involved-in-colonization-of-intercellular-spaces-of-host-plants-in-ralstonia-solanacearum
#16
REVIEW
Yasufumi Hikichi, Yuka Mori, Shiho Ishikawa, Kazusa Hayashi, Kouhei Ohnishi, Akinori Kiba, Kenji Kai
A soil-borne bacterium Ralstonia solanacearum invading plant roots first colonizes the intercellular spaces of the root, and eventually enters xylem vessels, where it replicates at high levels leading to wilting symptoms. After invasion into intercellular spaces, R. solanacearum strain OE1-1 attaches to host cells and expression of the hrp genes encoding components of the type III secretion system (T3SS). OE1-1 then constructs T3SS and secrets effectors into host cells, inducing expression of the host gene encoding phosphatidic acid phosphatase...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28642753/suhb-regulates-the-motile-sessile-switch-in-pseudomonas-aeruginosa-through-the-gac-rsm-pathway-and-c-di-gmp-signaling
#17
Kewei Li, Guangjian Yang, Alexander B Debru, Pingping Li, Li Zong, Peizhen Li, Teng Xu, Weihui Wu, Shouguang Jin, Qiyu Bao
Many Pseudomonas aeruginosa virulence traits that contribute to human infections are accepted as being associated with its environmental lifestyle. Therefore, identifying the molecular mechanisms that govern the lifestyle choice is of high significance. We previously reported that a mutation in suhB results in a decrease in swimming motility and increased biofilm formation compared to the wild-type strain. Yet, little is known about how this occurs. In this study, we demonstrated that SuhB inversely regulates motility and biofilm formation through the GacA-RsmY/Z-RsmA cascade...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28642749/rna-seq-reveals-enhanced-sugar-metabolism-in-streptococcus-mutans-co-cultured-with-candida-albicans-within-mixed-species-biofilms
#18
Jinzhi He, Dongyeop Kim, Xuedong Zhou, Sang-Joon Ahn, Robert A Burne, Vincent P Richards, Hyun Koo
Early childhood caries (ECC), which can lead to rampant tooth-decay that is painful and costly to treat, is one of the most prevalent infectious diseases affecting children worldwide. Previous studies support that interactions between Streptococcus mutans and Candida albicans are associated with the pathogenesis of ECC. The presence of Candida enhances S. mutans growth, fitness and accumulation within biofilms in vitro, although the molecular basis for these behaviors is undefined. Using an established co-cultivation biofilm model and RNA-Seq, we investigated how C...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28642736/identification-of-an-efflux-transporter-lmrb-regulating-stress-response-and-extracellular-polysaccharide-synthesis-in-streptococcus-mutans
#19
Jia Liu, Lihong Guo, Jianwei Liu, Jianying Zhang, Huihui Zeng, Yang Ning, Xi Wei
Efflux transporters have been implicated in regulating bacterial virulence properties such as resistance to antibiotics, biofilm formation and colonization. The pathogenicity of Streptococcus mutans, the primary etiologic agent of human dental caries, relies on the bacterium's ability to form biofilms on tooth surface. However, the studies on efflux transporters in S. mutans are scare and the function of these transporters remained to be clarified. In this study, we identified an efflux transporter (LmrB) in S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28642545/high-throughput-screening-of-small-molecule-inhibitors-of-the-streptococcus-quorum-sensing-signal-pathway
#20
Seiji Ishii, Kenji Fukui, Satoshi Yokoshima, Kazuo Kumagai, Youko Beniyama, Tetsuya Kodama, Tohru Fukuyama, Takayoshi Okabe, Tetsuo Nagano, Hirotatsu Kojima, Takato Yano
The main components of the quorum-sensing system are expected to be favorable targets for drug development to combat various chronic infectious diseases. ComA of Streptococcus is an ATP-binding cassette transporter containing a peptidase domain (PEP), which is essential for the quorum-sensing signal production. Using high-throughput screening, we found a potent small molecule that suppressed the S. mutans quorum-sensing pathway through inhibition of PEP activity. The compound effectively attenuated the biofilm formation and competence development of S...
June 22, 2017: Scientific Reports
keyword
keyword
5401
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"