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Akashdeep Singh Oberoi, Ligy Philip
In the present study, an attempt was made to understand the variation in the toxicity during the biodegradation of aromatic hydrocarbons in single and multi-substrate system. The bacterial bioassay based on the inhibition of dehydrogenase enzyme activity of two different bacterial sp. E.coli and Pseudomonas fluorescens was used for toxicity assessment. Amongst the chosen pollutants, the highest acute toxicity was observed for benzothiophene followed by benzofuran having EC50 value of 16.60mg/L and 19.30mg/L respectively...
October 19, 2016: Ecotoxicology and Environmental Safety
Kaouther Majouli, Assia Hamdi, Kamel Msaada, Abderraouf Kenani
This study was carried out with the objective to investigate the antibacterial activity of Hertia cheirifolia L. extracts against Gram-positive and Gram-negative strains including Staphylococcus aureus (ATCC 6538), Bacillus subtilis (ATCC 6633), Bacillus licheniformis, Esherichia coli (ATCC 8739), Pseudomonas aeruginosa (ATCC 9027), Salmonella enterica (CIP 8039) and Salmonella typhimirium. The results of this antibacterial screening showed that the ethyl acetate (EtOAc) extracts had the best activity against the tested microorganisms...
October 18, 2016: Microbial Pathogenesis
Chandrashekhar Patil, Rahul Suryawanshi, Sunil Koli, Satish Patil
Aminocyclopropane-1-carboxylate deaminase (ACCD) producing microorganisms support plant growth under a variety of biotic and abiotic stress conditions such as drought, soil salinity, flooding, heavy metal pollution and phyto-pathogen attack. Available screening methods for ACCD give idea only about its primary microbial ACCD activity than the actual potential. In the present investigation, we have simply improved screening method by incorporating pH indicator dyes (phenol red and bromothymol blue) in ACC containing medium...
October 18, 2016: Journal of Microbiological Methods
Brett A Beaupre, Joseph V Roman, Matthew R Hoag, Kathleen M Meneely, Nicholas R Silvaggi, Audrey L Lamb, Graham R Moran
Renalase catalyzes the oxidation of isomers of β-NAD(P)H that carry the hydride in the 2 or 6 positions of the nicotinamide base to form β-NAD(P)(+). This activity is thought to alleviate inhibition of multiple β-NAD(P)-dependent enzymes of primary and secondary metabolism by these isomers. Here we present evidence for a variety of ligand binding phenomena relevant to the function of renalase. We offer evidence of the potential for primary metabolism inhibition with structures of malate dehydrogenase and lactate dehydrogenase bound to the 6-dihydroNAD isomer...
October 18, 2016: Archives of Biochemistry and Biophysics
Shahriyar Taghavi-Moghadam, Cecil D Kwong, John A Secrist, Shabana I Khan, Alice M Clark
Eupolauridine, an indenonaphthyridine alkaloid, has been previously reported by us to exhibit antifungal activity. This study describes the synthesis of new alkyl and benzyl naphthyridinium/pyridinium analogs of eupolauridine as potential antifungal agents. A majority of the analogs exhibited antifungal activity against opportunistic pathogens such as Candida albicans and Cryptococcus neoformans. Several of them were also effective against bacteria (Staphylococcus aureus, MRS, Pseudomonas and Mycobacterium) and the malaria parasite (Plasmodium falciparum) to variable extents...
February 23, 2016: Bioorganic & Medicinal Chemistry
Andrea M Tarnecki, William F Patterson, Covadonga R Arias
BACKGROUND: The microbiota plays an essential role in host health, particularly through competition with opportunistic pathogens. Changes in total bacterial load and microbiota structure can indicate early stages of disease, and information on the composition of bacterial communities is essential to understanding fish health. Although Red Snapper (Lutjanus campechanus) is an economically important species in recreational fisheries and a primary aquaculture candidate, no information is available on the microbial communities of this species...
October 21, 2016: BMC Microbiology
Carlos Molina-Santiago, Zulema Udaondo, María Gómez-Lozano, Soren Molin, Juan Luis Ramos
Pseudomonas putida strains are generally recognized as solvent tolerant, exhibiting varied sensitivity to organic solvents. Pan-genome analysis has revealed that 30% of genes belong to the core-genome of Pseudomonas. Accessory and unique genes confer high degree of adaptability and capabilities for the degradation and synthesis of a wide range of chemicals. For the use of these microbes in bioremediation and biocatalysis, it is critical to understand the mechanisms underlying these phenotypic differences. In this study, RNA-seq analysis compared the short- and long-term responses of the toluene-sensitive KT2440 strain and the highly-tolerant DOT-T1E strain...
October 21, 2016: Environmental Microbiology
Debarun Dutta, Ajay K Vijay, Naresh Kumar, Mark D P Willcox
Purpose: To determine the ability of antimicrobial peptide melimine-coated contact lenses to reduce the incidence of microbial keratitis (MK) in a rabbit model of contact lens wear. Methods: In vitro antimicrobial activity of melimine-coated contact lenses was determined against Pseudomonas aeruginosa by viable count and a radiolabeled assay. The amount of lipopolysaccharide (LPS) associated with bacteria bound to melimine-coated and control lenses was determined...
October 1, 2016: Investigative Ophthalmology & Visual Science
Matteo Bassetti, Alessia Carnelutti, Maddalena Peghin
The isolation of multi-drug-resistant gram-negative (MDRGN) pathogens has progressively increased worldwide and has been associated with important delays in the prescription of an adequate antibiotic treatment, resulting in increased mortality rates. Patient's stratification for MDRGN infections to optimize the prescription of an adequate empiric antimicrobial regimen is crucial. Areas covered: This article covers MDRGN epidemiology, with a specific focus on risk factors for harbouring infections sustained by extended-spectrum-Beta-lactamase (ESBL), carbapenem resistant Enterobacteriacae (CRE), MDR Pseudomonas aeruginosa and MDR Acinetobacter baumanii...
October 21, 2016: Expert Review of Anti-infective Therapy
Shakeela Yasmeen, Sajjad Hussain Sumrra, Muhammad Safwan Akram, Zahid H Chohan
A novel series of thiophene derived Schiff bases and their transition metal- [Co(II), Cu(II), Zn(II), Ni(II)] based compounds are reported. The Schiff bases act as tridentate ligands toward metal ions via azomethine-N, deprotonated-N of ammine substituents and S-atom of thienyl moiety. The synthesized ligands along with their metal complexes were screened for their in vitro antibacterial activity against six bacterial pathogens (Escherichia coli, Shigella flexneri, Pseudomonas aeruginosa, Salmonella typhi, Staphylococcus aureus and Bacillus subtilis) and for antifungal activity against six fungal pathogens (Trichophytonlongifusus, Candida albicans, Aspergillus flavus, Microsporum canis, Fusarium solani and Candida glabrata)...
October 21, 2016: Journal of Enzyme Inhibition and Medicinal Chemistry
Mana Tsukada, Hong Sheng, Toshiaki Kamachi, Yoshimi Niwano
Wine lees, a major waste product of winemaking, is a rich source of polyphenolic compounds. LED-light irradiation at 400-nm elicited microbicidal activity of aqueous extract from wine lees (WLE) against Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans, in addition to reactive oxygen species (ROS) formation, including hydroxyl radical (·OH) and hydrogen peroxide (H2O2). Although treatment for 20 min of photoirradiation alone exerted bactericidal activity with a 2- to 3-log reduction, photoirradiated WLE for 20 min achieved a 5-log or greater reduction in viable S...
July 2016: Journal of Food Science and Technology
Intidhar Bkhairia, Rabeb Ben Slama Ben Salem, Rim Nasri, Mourad Jridi, Sofiane Ghorbel, Moncef Nasri
Bioactive Liza aurata protein hydrolysates (LAPHs) were prepared by treatment with Trypsine (PH-TR), Esperase (PH-ES), enzyme preparations from Pseudomonas aeruginosa A2 (PH-A2), Bacillus subtilis A26 (PH-A26) and Liza aurata (PH-LA). Their functional properties and antioxidant activities were evaluated. The hydrolysates had degree of hydrolysis (DH) values ranging from 8.15 % to 13.05 %. Reverse-phase HPLC analyses of the LAPHs showed considerable variation in peptide composition. All hydrolysates had high protein content (83...
July 2016: Journal of Food Science and Technology
Alexandre Boulos, Katherine Rand, Josh A Johnson, Jacqueline Gautier, Michael Koster
Infections (including sepsis, meningitis, pneumonia and tetanus) stand as a major contributor to neonatal mortality in Haiti (22%). Infants acquire bacteria that cause neonatal sepsis directly from the mother's blood, skin or vaginal tract either before or during delivery. Nosocomial and environmental pathogens introduce further risk after delivery. The absence of cohesive medical systems and methods for collecting information limits the available data in countries such as Haiti. This study seeks to add more information on the burden of severe bacterial infections and their etiology in neonates of Haiti...
October 19, 2016: Journal of Tropical Pediatrics
B Demirhan, K Candoğan
The effects of modified atmosphere packaging (MAP-70% CO2/30%N2) and iron-based oxygen scavengers (OS) with various absorption capacities (Ageless(®) ss100, ss300, and ss500) as an active packaging system on microbiological and oxidative changes in chicken thigh meats were evaluated during refrigerated storage (4°C) for 19 d at 3-day intervals. Total aerobic mesophilic bacteria counts exceeded the acceptability limit at d 7 in the control group without MAP (AIR), and at d 19 in MAP and OS containing samples...
October 19, 2016: Poultry Science
Gang Li, Mengyu Shen, Shuai Le, Yinling Tan, Ming Li, Xia Zhao, Wei Shen, Yuhui Yang, Jing Wang, Hongbin Zhu, Shu Li, Xiancai Rao, Fuquan Hu, Shuguang Lu
As a third-generation sequencing method, single-molecule real-time (SMRT) technology provides long read length, and it is well suited for re-sequencing projects and de novo assembly. In this study, Pseudomonas aeruginosa PA1 was characterized and re-sequenced using SMRT technology. PA1 was also subjected to genomic, comparative, and pan-genomic analyses. The multi-drug resistant strain PA1 possesses a 6,498,072 bp genome and a sequence type of ST-782. The genome of PA1 was also visualized, and the results revealed the details of general genome annotations, virulence factors, regulatory proteins, secretion system proteins, type II toxin-antitoxin pairs, and genomic islands...
October 20, 2016: Bioscience Reports
Zhongqiu Chen, Wen Ling, Guangdong Shang
Pseudomonas putida KT2440 is a saprophytic, generally recognized as safe microorganism that plays important roles in the biodegradation and production of value-added chemicals. Chromosomal gene deletion of P. putida KT2440 usually involves time-consuming gene coning, conjugal transfer and counterselection. Recently, we developed a P. putida KT2440 markerless gene deletion method based on recombineering and Cre/loxP site-specific recombination. PCR-based λ Red recombineering circumvents the tedious cloning steps and is more amenable to high-throughput manipulation...
October 7, 2016: FEMS Microbiology Letters
Grzegorz Fila, Anna Kawiak, Mariusz Grinholc
Pseudomonas aeruginosa is among the most common pathogens responsible for both acute and chronic infections of high incidence and severity. Additionally, P. aeruginosa resistance to conventional antimicrobials has increased rapidly over the past decade. Therefore, it is crucial to explore new therapeutic options, particularly options that specifically target the pathogenic mechanisms of this microbe. The ability of a pathogenic bacterium to cause disease is dependent upon the production of agents termed 'virulence factors', and approaches to mitigate these agents have gained increasing attention as new antibacterial strategies...
October 20, 2016: Virulence
Joana Roßberg, Falko O Rottke, Burkhard Schulz, Andreas Lendlein
The influence of terminal functionalization of oligo(ε-caprolactone)s (OCL) with phenylboronic acid pinacol ester or phenylboronic acid on the enzymatic degradation behavior at the air-water interface is investigated by the Langmuir monolayer degradation technique. While the unsubstituted OCL immediately degrades after injection of the enzyme lipase from Pseudomonas cepacia, enzyme molecules are incorporated into the films based on end-capped OCL before degradation. This incorporation of enzymes does not inhibit or suppress the film degradation, but retards it significantly...
October 20, 2016: Macromolecular Rapid Communications
Yushu Yin, Georgia Papavasiliou, Olga Y Zaborina, John C Alverdy, Fouad Teymour
The human gastrointestinal tract is the primary site of colonization of multidrug resistant pathogens and the major source of life-threatening complications in critically ill and immunocompromised patients. Eradication measures using antibiotics carry further risk of antibiotic resistance. Furthermore, antibiotic treatment can adversely shift the intestinal microbiome toward domination by resistant pathogens. Therefore, approaches directed to prevent replacement of health promoting microbiota with resistant pathogens should be developed...
October 19, 2016: Annals of Biomedical Engineering
Fatima Belkhadem, Adil A Othman
Four N- and S-glycosides 13-16 having nucleobases 7-12 binding to sugar molecules from one side and to 3,5-dinitrophenyl moieties from another side were synthesized from 3,5-dinitrobenzoic acid 2. The synthetic intermediates, hydrazide 5 and thiosemicarbazide 6 regarded as important key compounds for the synthesis of nucleobases 7-12, each was obtained by two approaches. Structures of synthesized compounds were determined spectroscopically. Antibacterial activities for synthetic intermediates and glycosides were assessed using the paper disk diffusion method against Gram-negative bacteria: Pseudomonas aeruginosa, Pseudomonas fluorescens, and Escherichia coli and Gram-positive bacteria: Bacillus cereus and Staphylococcus aureus...
October 19, 2016: Molecular Diversity
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