keyword
MENU ▼
Read by QxMD icon Read
search

Iron bacteria

keyword
https://www.readbyqxmd.com/read/29785517/optimization-and-enhancement-of-textile-reactive-remazol-black-b-decolorization-and-detoxification-by-environmentally-isolated-ph-tolerant-pseudomonas-aeruginosa-ky284155
#1
Rasha A Hashem, Reham Samir, Tamer M Essam, Amal E Ali, Magdy A Amin
Azo dyes are complex derivatives of diazene used in food and textile manufacture. They are highly recalcitrant compounds, and account for severe environmental and health problems. Different strains of Pseudomonas species were isolated from textile wastewater effluents. The bioconversion of Remazol black B (a commonly used water soluble dye) by Pseudomonas aeruginosa was observed in static conditions. The bio-decolorization process was optimized by a multi factorial Plackett-Burman experimental design. Decolorization of 200 mg L-1 reached 100% in 32 h...
May 21, 2018: AMB Express
https://www.readbyqxmd.com/read/29783045/factors-affecting-gene-expression-and-activity-of-heme-and-manganese-dependent-catalases-in-lactobacillus-casei-strains
#2
Annamaria Ricciardi, Rocco Gerardo Ianniello, Eugenio Parente, Teresa Zotta
Catalases reduce oxidative stress by degrading hydrogen peroxide to molecular oxygen and water. The presence of heme-dependent or manganese-dependent catalases was observed for a long time in lactic acid bacteria (LAB) but, to date, knowledge on the factors affecting gene expression and enzymatic functionality are limited to a very few strains. In this study, the effect of atmosphere of incubation (not aerated static growth vs aerated shaken growth) and supplementation with Fe2+ , hemin, Mn2+ or their combinations on the catalase production of respiration-competent strain Lactobacillus casei N87 was evaluated using a 24 factorial design...
May 8, 2018: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29778215/anaerobic-bacterial-response-to-nitrosative-stress
#3
Jeffrey A Cole
This chapter provides an overview of current knowledge of how anaerobic bacteria protect themselves against nitrosative stress. Nitric oxide (NO) is the primary source of this stress. Aerobically its removal is an oxidative process, whereas reduction is required anaerobically. Mechanisms required to protect aerobic and anaerobic bacteria are therefore different. Several themes recur in the review. First, how gene expression is regulated often provides clues to the physiological function of the gene products...
2018: Advances in Microbial Physiology
https://www.readbyqxmd.com/read/29776923/environmental-adaptability-for-quorum-sensing-regulating-iron-uptake-during-biofilm-formation-in-paracoccus-denitrificans
#4
Yang Zhang, Jie Gao, Lushan Wang, Shuangjiang Liu, Zhihui Bai, Xuliang Zhuang, Guoqiang Zhuang
Paracoccus denitrificans is a valuable model organism due to its versatile respiration capability and bioenergetic flexibility, both of which are critical to its survival in different environments. Quorum sensing (QS) plays a crucial role in the regulation of many cell functions; however, whether QS systems play a role in P. denitrificans is unknown. In this study, we demonstrated that iron uptake systems in P. denitrificans were directly regulated by a newly identified QS system. Genes coding for TonB-dependent systems, which transport chelated iron, were transcribed at higher levels in the QS-defective mutants...
May 18, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29773197/efficient-zinc-uptake-is-critical-for-the-ability-of-pseudomonas-aeruginosa-to-express-virulence-traits-and-colonize-the-human-lung
#5
Maria Chiara Mastropasqua, Iain Lamont, Lois W Martin, David W Reid, Melania D'Orazio, Andrea Battistoni
We have recently shown that Pseudomonas aeruginosa, an opportunistic pathogen that chronically infects the lungs of patients with cystic fibrosis (CF) and other forms of lung disease, is extremely efficient in recruiting zinc from the environment and that this capability is required for its ability to cause acute lung infections in mice. To verify that P. aeruginosa faces zinc shortage when colonizing the lungs of human patients, we analyzed the expression of three genes that are highly induced under conditions of zinc deficiency (zrmA, dksA2 and rpmE2), in bacteria in the sputum of patients with inflammatory lung disease...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29773170/iron-and-innate-antimicrobial-immunity-depriving-the-pathogen-defending-the-host
#6
REVIEW
Manfred Nairz, Stefanie Dichtl, Andrea Schroll, David Haschka, Piotr Tymoszuk, Igor Theurl, Günter Weiss
The acute-phase response is triggered by the presence of infectious agents and danger signals which indicate hazards for the integrity of the mammalian body. One central feature of this response is the sequestration of iron into storage compartments including macrophages. This limits the availability of this essential nutrient for circulating pathogens, a host defence strategy known as 'nutritional immunity'. Iron metabolism and the immune response are intimately linked. In infections, the availability of iron affects both the efficacy of antimicrobial immune pathways and pathogen proliferation...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29769616/magnetic-field-induced-rotation-of-magnetosome-chains-in-silicified-magnetotactic-bacteria
#7
Marine Blondeau, Yohan Guyodo, François Guyot, Christophe Gatel, Nicolas Menguy, Imène Chebbi, Bernard Haye, Mickaël Durand-Dubief, Edouard Alphandery, Roberta Brayner, Thibaud Coradin
Understanding the biological processes enabling magnetotactic bacteria to maintain oriented chains of magnetic iron-bearing nanoparticles called magnetosomes is a major challenge. The study aimed to constrain the role of an external applied magnetic field on the alignment of magnetosome chains in Magnetospirillum magneticum AMB-1 magnetotactic bacteria immobilized within a hydrated silica matrix. A deviation of the chain orientation was evidenced, without significant impact on cell viability, which was preserved after the field was turned-off...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29767396/are-lactoferrin-receptors-in-gram-negative-bacteria-viable-vaccine-targets
#8
Clement Chan, Vahid F Andisi, Dixon Ng, Nick Ostan, Warren K Yunker, Anthony B Schryvers
A number of important Gram-negative pathogens that reside exclusively in the upper respiratory or genitourinary tract of their mammalian host rely on surface receptors that specifically bind host transferrin and lactoferrin as a source of iron for growth. The transferrin receptors have been targeted for vaccine development due to their critical role in acquiring iron during invasive infection and for survival on the mucosal surface. In this study, we focus on the lactoferrin receptors, determining their prevalence in pathogenic bacteria and comparing their prevalence in commensal Neisseria to other surface antigens targeted for vaccines; addressing the issue of a reservoir for vaccine escape and impact of vaccination on the microbiome...
May 16, 2018: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/29760206/alternative-oxidase-activity-reduces-stress-in-vibrio-fischeri-cells-exposed-to-nitric-oxide
#9
Anne K Dunn
Alternative oxidase (Aox) is a non-energy conserving respiratory oxidase found in certain eukaryotes and bacteria, whose role in physiology is not entirely clear. Using the genetically tractable bacterium Vibrio fischeri as a model organism, we have identified a role for Aox to reduce levels of stress in cells exposed to oxygen and nitric oxide (NO). In V. fischeri lacking the NO-detoxifying enzyme flavohemoglobin (Hmp), deletion of aox in cells grown in the presence of oxygen and NO results in alterations to the transcriptome that include increases in transcripts mapping to stress-related genes...
May 14, 2018: Journal of Bacteriology
https://www.readbyqxmd.com/read/29759729/recyclable-magnetic-nanoparticles-grafted-with-antimicrobial-metallopolymer-antibiotic-bioconjugates
#10
Parasmani Pageni, Peng Yang, Marpe Bam, Tianyu Zhu, Yung Pin Chen, Alan W Decho, Mitzi Nagarkatti, Chuanbing Tang
Over-prescription and improper use of antibiotics has led to the emergence of bacterial resistance, posing a major threat to public health. There has been significant interest in the development of alternative therapies and agents to combat antibiotic resistance. We report the preparation of recyclable magnetic iron oxide nanoparticles grafted with charged cobaltocenium-containing metallopolymers by surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization. β-Lactam antibiotics were then conjugated with metallopolymers to enhance their vitality against both Gram-positive and Gram-negative bacteria...
May 3, 2018: Biomaterials
https://www.readbyqxmd.com/read/29758538/preparation-and-characterization-of-iron-oxide-magnetic-nanoparticles-functionalized-by-nisin
#11
Ruta Gruskiene, Tatjana Krivorotova, Ramune Staneviciene, Dalius Ratautas, Elena Serviene, Jolanta Sereikaite
Nisin is a known bacteriocin approved as a food additive for food preservation. It exhibits a wide spectrum antimicrobial activity against Gram-positive bacteria. Iron oxide magnetic nanoparticles were synthesized and characterized by X-ray diffraction method. A main part of iron oxide nanoparticles was found to be maghemite though a small quantity of magnetite could also be present. Magnetic nanoparticles were stabilized by citric, ascorbic, gallic or glucuronic acid coating. Stable iron oxide magnetic nanoparticles were functionalized by nisin using a simple and low cost adsorption method...
May 8, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29755448/low-light-anoxygenic-photosynthesis-and-fe-s-biogeochemistry-in-a-microbial-mat
#12
Sebastian Haas, Dirk de Beer, Judith M Klatt, Artur Fink, Rebecca McCauley Rench, Trinity L Hamilton, Volker Meyer, Brian Kakuk, Jennifer L Macalady
We report extremely low-light-adapted anoxygenic photosynthesis in a thick microbial mat in Magical Blue Hole, Abaco Island, The Bahamas. Sulfur cycling was reduced by iron oxides and organic carbon limitation. The mat grows below the halocline/oxycline at 30 m depth on the walls of the flooded sinkhole. In situ irradiance at the mat surface on a sunny December day was between 0.021 and 0.084 μmol photons m-2 s-1 , and UV light (<400 nm) was the most abundant part of the spectrum followed by green wavelengths (475-530 nm)...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29752940/oxidative-stress-redox-stress-or-redox-success
#13
John M C Gutteridge, Barry Halliwell
The first life forms evolved in a highly reducing environment. This reduced state is still carried by cells today, which makes the concept of "reductive stress" somewhat redundant. When oxygen became abundant on the Earth, due to the evolution of photosynthesis, life forms had to adapt or become extinct. Living organisms did adapt, proliferated and an explosion of new life forms resulted, using reactive oxygen species (ROS) to drive their evolution. Adaptation to oxygen and its reduction intermediates necessitated the simultaneous evolution of select antioxidant defences, carefully regulated to allow ROS to perform their major roles...
May 9, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29751343/clavanin-a-bioconjugated-fe-3-o-4-silane-core-shell-nanoparticles-for-thermal-ablation-of-bacterial-biofilms
#14
Kalline L Ribeiro, Isaac A M Frías, Octavio L Franco, Simoni C Dias, Ailton A Sousa-Junior, Osmar N Silva, Andris F Bakuzis, Maria D L Oliveira, Cesar A S Andrade
The use of central venous catheters (CVC) is highly associated with nosocomial blood infections and its use largely requires a systematic assessment of benefits and risks. Bacterial contamination of these tubes is frequent and may result in development of microbial consortia also known as biofilm. The woven nature of biofilm provides a practical defense against antimicrobial agents, facilitating bacterial dissemination through the patient's body and development of antimicrobial resistance. In this work, the authors describe the modification of CVC tubing by immobilizing Fe3 O4 -aminosilane core-shell nanoparticles functionalized with antimicrobial peptide clavanin A (clavA) as an antimicrobial prophylactic towards Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Klebsiella pneumoniae...
April 27, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29751230/the-anti-biofouling-behavior-of-high-voltage-pulse-electric-field-hpef-mediated-by-carbon-fiber-composite-coating-in-seawater
#15
Tiantian Feng, Jinyi Wu, Ke Chai, Pengpeng Yang
One of the most important research areas in the marine industry is to investigate new and effective anti-biofouling technologies. In this study, high voltage pulse electric field (HPEF) mediated by carbon fiber (CF) composite coating was utilized to prevent the fouling of bacteria, microalgae and barnacle larvae in seawater. The plate count, 2, 3, 5-triphenyl-tetrazolium chloride (TTC) reduction assay and neutral red (NR) staining and larval motility detection showed that the inactivation rates were at the highest levels, which reached 99...
April 25, 2018: Bioelectrochemistry
https://www.readbyqxmd.com/read/29746796/detection-of-bacteria-in-water-with-%C3%AE-galactosidase-coated-magnetic-nanoparticles
#16
Mingyue Cui, Hao Chang, Yang Zhong, Min Wang, Tianze Wu, Xiao Hu, Zhichuan J Xu, Chenjie Xu
Pathogenic contamination and resistant bacterial infections remain critical concerns in both developed and developing countries. Rapid and sensitive detection of pathogens is still a key requirement for both environmental and clinical settings. This article introduces a simple, colorimetric, cost-effective, and high-throughput system based on a positively charged iron oxide/enzyme complex for the detection of both gram-positive and gram-negative bacteria in water between 103 and 108 cfu/mL. This study provides an effective strategy for the identification and purification of pathogen contamination in drinking water...
May 1, 2018: SLAS Technology
https://www.readbyqxmd.com/read/29746246/conformationally-gated-electron-transfer-in-nitrogenase-isolation-purification-and-characterization-of-nitrogenase-from-gluconacetobacter-diazotrophicus
#17
Cedric P Owens, Faik A Tezcan
Nitrogenase is a complex, bacterial enzyme that catalyzes the ATP-dependent reduction of dinitrogen (N2 ) to ammonia (NH3 ). In its most prevalent form, it consists of two proteins, the catalytic molybdenum-iron protein (MoFeP) and its specific reductase, the iron protein (FeP). A defining feature of nitrogenase is that electron and proton transfer processes linked to substrate reduction are synchronized by conformational changes driven by ATP-dependent FeP-MoFeP interactions. Yet, despite extensive crystallographic, spectroscopic, and biochemical information on nitrogenase, the structural basis of the ATP-dependent synchronization mechanism is not understood in detail...
2018: Methods in Enzymology
https://www.readbyqxmd.com/read/29744444/recyclable-magnetite-silver-heterodimer-nanocomposites-with-durable-antibacterial-performance
#18
Chunyan Yong, Xiaoqin Chen, Qian Xiang, Qiang Li, Xiaodong Xing
There is a significant need for magnetite-silver nanocomposites that exhibit durable and recyclable antimicrobial activity. In this study, magnetic iron oxide nanoparticles (Fe3 O4 NPs) coated with ethylenediamine-modified chitosan/polyacrylic acid copolymeric layer (Fe3 O4 @ECS/PAA) were fabricated. Subsequently, directly deposited silver (Ag) NPs procedure was carried out to form the antibacterial heterodimers of Fe3 O4 @ECS/PAA-Ag NPs. The composition and morphology of the resultant nanostructures were confirmed by FT-IR, XRD, TEM and TGA...
March 2018: Bioactive Materials
https://www.readbyqxmd.com/read/29738815/the-conventional-pathogenic-flora-compositions-an-overview-of-the-trends-used-for-bacterial-pathogenicity-identifications
#19
REVIEW
Frank Anayo Orji, Ositadinma Chinyere Ugbogu, Eziuche Amadike Ugbogu, Alberto Barbabosa-Pliego, Jose Cedillo Monroy, Abdelfattah Z M Salem
Over 250 species of resident flora in the class of bacteria are known to be associated with humans. These conventional flora compositions is often determined by factors which may not be limited to stress, nutrition, genetics, and age, sex, stress, nutrition of humans. Man is constantly in contact with bacteria through media such as air, water, soil and food. This paper reviews the concept of bacterial pathogenesis from the sequential point of colonization to tissue injury. The paper in addition to examination of the factors which enhances virulence in bacterial pathogens also x-rayed the concept of pathogenicity islands and the next generation approaches or rather current trends/methods used in the bacterial pathogenicity investigations...
May 5, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29738246/inoculation-with-bacillus-subtilis-and-azospirillum-brasilense-produces-abscisic-acid-that-reduces-irt1-mediated-cadmium-uptake-of-roots
#20
Qianru Xu, Wei Pan, Ranran Zhang, Qi Lu, Wanlei Xue, Cainan Wu, Bixiu Song, Shaoting Du
Cadmium (Cd) contamination of agricultural soils represents a serious risk to crop safety. A new strategy using abscisic acid (ABA)-generating bacteria, Bacillus subtilis or Azospirillum brasilense, was developed to reduce the Cd accumulation in plants grown in Cd-contaminated soil. Inoculation with either bacterium resulted in a pronounced increase in the ABA level in wild-type Arabidopsis Col-0 plants, accompanied by a decrease in Cd levels in plant tissues, which mitigated the Cd toxicity. As a consequence, the growth of plants exposed to Cd was improved...
May 8, 2018: Journal of Agricultural and Food Chemistry
keyword
keyword
61138
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"