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Letteratura scientifica selezionata sul tema "Iron bacteria"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 27 luglio 2024

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Articoli di riviste sul tema "Iron bacteria"

1

Phoenix, Vernon R., Kurt O. Konhauser e F. Grant Ferris. "Experimental study of iron and silica immobilization by bacteria in mixed Fe-Si systems: implications for microbial silicification in hot springs". Canadian Journal of Earth Sciences 40, n. 11 (1 novembre 2003): 1669–78. http://dx.doi.org/10.1139/e03-044.

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The immobilization of silica and iron by the bacteria Bacillus subtilis was monitored in controlled microcosms to elucidate the role iron may play in aiding bacterial silicification in hot springs. Silica and iron immobilization was monitored as a function of bacterial concentration, iron concentration, and silica concentration (both undersaturated and oversaturated with respect to amorphous silica). Results demonstrate that bacterial cells do immobilize more Fe than bacteria-free systems in solutions with iron concentrations [Formula: see text]50 ppm Fe. However, as iron concentrations increase, the difference between Fe immobilization in bacterial and bacteria-free systems decreases as non-bacterially mediated precipitation processes dominate. Additionally, bacterial systems that had immobilized more Fe compared with bacteria-free systems did not immobilize more silica than bacteria-free systems. By comparing molar ratios of (silica in solution)/(bacterially bound Fe), it is evident that insufficient iron is bound to the bacterial surface to act as an effective salt bridge for silica sorption. This appears to be because much of the iron is immobilized by non-bacterially mediated precipitation of phases such as Fe(OH)3 and poorly ordered hydrous iron silicates. It follows that in silica-enriched hot springs, silica and iron immobilization processes are significantly dominated by non-bacterially mediated precipitation. Any bacterially mediated processes are exceedingly small and outside the resolution of these experiments.

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2

Kupka, Daniel, Michal Lovás e Vladimir Šepelák. "Deferrization of Kaolinic Sand by Iron Oxidizing and Iron Reducing Bacteria". Advanced Materials Research 20-21 (luglio 2007): 130–33. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.130.

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Iron oxidizing bacteria Acidithiobacillus ferrooxidans, iron reducing bacteria Acidiphilium spp. and their mixture were applied for leaching of iron impurities from quartz sand. The bacterial leaching was carried out in order to decrease the amount of colouring iron oxides and to improve the technological properties of the raw material. Mineralogical analysis confirmed the presence of siderite, iron-bearing muscovite and various amorphous and crystalline forms of iron oxides occurring both free and coating siderite and quartz particles. Mössbauer spectroscopy revealed various oxidation and magnetic states of iron ions, with the prevalence of reduced ionic species. Highest extraction of iron was achieved with pure culture of iron-reducing bacteria with ferrous iron as dominant species in the leaching liquor. Surprisingly, iron oxidizing bacteria caused passivation of the surface of iron-bearing minerals, resulting in the depression of iron leaching in comparison with abiotic control. Ferric iron was major species in the leaching solution containing the mixed culture of iron-oxidizing and iron-reducing bacteria. The mixture was far less efficient in iron extraction than pure culture of iron-reducing bacteria.

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3

Tang, Kam W., e Hans-Peter Grossart. "Iron effects on colonization behavior, motility, and enzymatic activity of marine bacteria". Canadian Journal of Microbiology 53, n. 8 (agosto 2007): 968–74. http://dx.doi.org/10.1139/w07-059.

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Iron availability in the ocean has been shown to affect the growth and production of phytoplankton and free-living bacteria. A large fraction of marine bacteria are specialized in colonizing and living on particles and aggregates, but the effects of iron limitation on these bacteria are not fully known. We conducted laboratory experiments to study the effects of iron availability on particle colonization behavior, motility, and enzymatic activities of 4 strains of marine bacteria. Iron depletion reduced the bacterial particle colonization rate by 1.7%–43.1%, which could be attributed to reduced swimming speeds in 2 of the 4 strains. Protease activity was not affected by iron availability. However, attached bacteria did show higher protease activities than their free counterparts. Our results suggest that iron limitation in the ocean could in some cases reduce bacteria–particle interactions by reducing bacterial motility and colonization rate.

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4

Page, Malcom G. P. "The Role of Iron and Siderophores in Infection, and the Development of Siderophore Antibiotics". Clinical Infectious Diseases 69, Supplement_7 (13 novembre 2019): S529—S537. http://dx.doi.org/10.1093/cid/ciz825.

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Abstract Iron is an essential nutrient for bacterial growth, replication, and metabolism. Humans store iron bound to various proteins such as hemoglobin, haptoglobin, transferrin, ferritin, and lactoferrin, limiting the availability of free iron for pathogenic bacteria. However, bacteria have developed various mechanisms to sequester or scavenge iron from the host environment. Iron can be taken up by means of active transport systems that consist of bacterial small molecule siderophores, outer membrane siderophore receptors, the TonB-ExbBD energy-transducing proteins coupling the outer and the inner membranes, and inner membrane transporters. Some bacteria also express outer membrane receptors for iron-binding proteins of the host and extract iron directly from these for uptake. Ultimately, iron is acquired and transported into the bacterial cytoplasm. The siderophores are small molecules produced and released by nearly all bacterial species and are classified according to the chemical nature of their iron-chelating group (ie, catechol, hydroxamate, α-hydroxyl-carboxylate, or mixed types). Siderophore-conjugated antibiotics that exploit such iron-transport systems are under development for the treatment of infections caused by gram-negative bacteria. Despite demonstrating high in vitro potency against pathogenic multidrug-resistant bacteria, further development of several candidates had stopped due to apparent adaptive resistance during exposure, lack of consistent in vivo efficacy, or emergence of side effects in the host. However, cefiderocol, with an optimized structure, has advanced and has been investigated in phase 1 to 3 clinical trials. This article discusses the mechanisms implicated in iron uptake and the challenges associated with the design and utilization of siderophore-mimicking antibiotics.

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5

Tang, Yu Lan, Wei Bin Wu, Ya Ting He, Jin Xiang Fu e Xiao Lan Wang. "Low-Temperature Domestication of an Iron and Manganese Oxidizing Bacteria". Advanced Materials Research 374-377 (ottobre 2011): 826–30. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.826.

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Abstract.One superior iron and manganese bacteria were separated from the stable operation of porcelain granular BAF filters of removing iron, manganese and ammonia. The bacteria was domesticated at low temperature. By analyzing the sample water containing iron and manganese in the role of iron and manganese bacteria which was not domesticated and domesticated at different temperature, observing the Iron and manganese concentration with time going on, studying the bacteria’s removal of iron and manganese property and the domesticated effect. Studies show that: the selected bacteria with 1% bacterial liquid at proper temperature within 48h ,the removal rate of iron and manganese was 75% and 35% respectively;After domesticated at low temperature, the removal rate of the iron and manganese domesticated bacteria at 10°C was improved 0.4 and 2 times more than the before domesticated; The iron and manganese domesticated bacteria at 10°C did not grow at 4°C,but the bacteria’s removal rate was better than the bacteria cultured at 30°C,and the iron removal rate was improved from 23% to 35%,the manganese removal rate was improved from 5% to 11%.

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6

Xing, Weijia, Yue Zhan, Lei Yang e Lei Yan. "Iron Biomineralization Performed by Iron-Cycling Bacteria and Magnetotactic Bacteria". ACTA SCIENTIFIC MICROBIOLOGY 1, n. 3 (1 marzo 2018): 28–29. http://dx.doi.org/10.31080/asmi.2018.01.0024.

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7

Kuznetsova, D. A., V. A. Rykova e O. N. Podladchikova. "Bacterial Siderophores: Structure, Functions, and Role in the Pathogenesis of Infections". Problems of Particularly Dangerous Infections, n. 3 (29 ottobre 2022): 14–22. http://dx.doi.org/10.21055/0370-1069-2022-3-14-22.

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This review systematizes and analyzes the data published over the past decade, devoted to the study of low-molecular-weight high affinity iron chelators – siderophores. Siderophores, which are found in bacteria, fungi and mammals, are able to extract iron from insoluble inorganic compounds, and in the host organism – from complexes with proteins that perform the function of nonspecific protection of mammals from infections. The extracted iron is delivered to cells through surface protein receptors specific for each siderophore, as well as various protein transport systems that make up membranes. Siderophores play an important role in virulence in pathogenic bacteria, performing many functions in the host organism, in addition to providing microbes with iron and other biological metals. They participate in the storage of excess iron, toxic to cells, protect bacteria from reactive oxygen compounds, compete for iron with phagocytes, and have a harmful effect on host cells, acting as secreted bacterial toxin in some cases. Bacterial siderophores perform a signaling function and regulate both, their own synthesis and the synthesis of other virulence factors. Many pathogenic bacteria produce several siderophores that are active under different conditions, against various sources of iron in the host organism and at different stages of infectious process. The review presents the results of the experimental studies aimed at elucidating the structure and diverse functions of bacterial siderophores, the mechanisms of their biosynthesis and regulation of expression, as well as the role of these molecules in the physiology and virulence of pathogenic bacteria. Special emphasis is put on siderophores of bacteria causing particularly dangerous infections.

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8

Ebrahiminezhad, Alireza, Zahra Manafi, Aydin Berenjian, Sedigheh Kianpour e Younes Ghasemi. "Iron-Reducing Bacteria and Iron Nanostructures". Journal of Advanced Medical Sciences and Applied Technologies 3, n. 1 (22 maggio 2017): 9. http://dx.doi.org/10.18869/nrip.jamsat.3.1.9.

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9

Liu, Zhuoming, Scott Reba, Wei-Dong Chen, Suheel Kumar Porwal, W. Henry Boom, Robert B. Petersen, Roxana Rojas, Rajesh Viswanathan e L. Devireddy. "Regulation of mammalian siderophore 2,5-DHBA in the innate immune response to infection". Journal of Experimental Medicine 211, n. 6 (26 maggio 2014): 1197–213. http://dx.doi.org/10.1084/jem.20132629.

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Competition for iron influences host–pathogen interactions. Pathogens secrete small iron-binding moieties, siderophores, to acquire host iron. In response, the host secretes siderophore-binding proteins, such as lipocalin 24p3, which limit siderophore-mediated iron import into bacteria. Mammals produce 2,5-dihydroxy benzoic acid, a compound that resembles a bacterial siderophore. Our data suggest that bacteria use both mammalian and bacterial siderophores. In support of this idea, supplementation with mammalian siderophore enhances bacterial growth in vitro. In addition, mice lacking the mammalian siderophore resist E. coli infection. Finally, we show that the host responds to infection by suppressing siderophore synthesis while up-regulating lipocalin 24p3 expression via TLR signaling. Thus, reciprocal regulation of 24p3 and mammalian siderophore is a protective mechanism limiting microbial access to iron.

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Akinbosede, Daniel, Robert Chizea e Stephen A. Hare. "Pirates of the haemoglobin". Microbial Cell 9, n. 4 (4 aprile 2022): 84–102. http://dx.doi.org/10.15698/mic2022.04.775.

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Not all treasure is silver and gold; for pathogenic bacteria, iron is the most precious and the most pillaged of metallic elements. Iron is essential for the survival and growth of all life; however free iron is scarce for bacteria inside human hosts. As a mechanism of defence, humans have evolved ways to store iron so as to render it inaccessible for invading pathogens, such as keeping the metal bound to iron-carrying proteins. For bacteria to survive within humans, they must therefore evolve counters to this defence to compete with these proteins for iron binding, or directly steal iron from them. The most populous form of iron in humans is haem: a functionally significant coordination complex that is central to oxygen transport and predominantly bound by haemoglobin. Haemoglobin is therefore the largest source of iron in humans and, as a result, bacterial pathogens in critical need of iron have evolved complex and creative ways to acquire haem from haemoglobin. Bacteria of all cell wall types have the ability to bind haemoglobin at their cell surface, to accept the haem from it and transport this to the cytoplasm for downstream uses. This review describes the systems employed by various pathogenic bacteria to utilise haemoglobin as an iron source within human hosts and discusses their contribution to virulence.

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Tesi sul tema "Iron bacteria"

1

Bridge, Toni A. M. "Iron reduction by acidophilic bacteria". Thesis, Bangor University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295276.

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2

Granger, Julie. "Iron acquisition by heterotrophic marine bacteria". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0002/MQ44173.pdf.

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MacLean, Martin. "Autotrophy in iron-oxidizing, acidophilic bacteria". Thesis, University of Warwick, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357855.

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4

Fang, Wen. "Microbial Biomineralization of Iron". PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/664.

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Iron is a common cation in biomineral sand; it is present for example in magnetite produced by magnetotactic bacteria and in iron sulfides produced by sulfate reducing microorganisms. The work presented in this thesis focused on two types of microorganisms capable of forming iron biominerals. In the first project I have studied the effect of O2 on the respiratory physiology and the formation of magnetosomes by Magnetospirillum magneticum AMB-1. In the second project I have studied the relationship between olivine and the activity of dissimilatory sulfate reducing (DSR) microorganisms. For the first project, I grew cells of AMB-1 in cultures with various concentrations of O2 and monitored growth and the formation of magnetic mineral particles (MMP). Results have shown that AMB-1 cells grew better at 100-225 uMO2(aq) than at lower [O2], yet the formation of MMP was repressed at ~45 uM O2(aq) and strongly inhibited at >100 uM O2(aq).These results have helped better understand the dissimilarity between the optimal growth conditions of magnetotactic bacteria and the conditions needed for the formation of MMPs. My results have also shown that the reaction between H2S produced by DSRs and olivine is abiotic, not catalyzed and exergonic. The pH did not vary significantly during this reaction and pH variation (in the 5-9 range) did not significantly influence this chemical reaction. Bicarbonate inhibited the reaction between H2S and olivine, but not the chemical equilibrium. Phosphate, a weak iron chelator, influenced the equilibrium of the reaction and it is assumed to help increase the rate of olivine weathering in the presence of DSRs. The activity of DSRs was positively influenced by the presence and abundance of olivine. Based on my results I propose that olivine help DSR obtain energy more efficiently, but does not represent a source of energy or nutrients for the cells. These results helped better understand the formation of iron biominerals and signatures of this activity.

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5

Green, Robert. "Iron and manganese homeostasis in marine bacteria". Thesis, University of East Anglia, 2012. https://ueaeprints.uea.ac.uk/47962/.

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Using a mixture of bioinformatic analyses, microarrays on cells that were grown in media that were either replete or depleted for manganese or for iron, and by making targeted mutations and reporter fusions, several important observations were made on the mechanisms of Mn and Fe homeostasis in the marine α‐proteobacterium Ruegeria pomeroyi (the main species studied here), and in other important marine bacteria. R. pomeroyi lacks most of the known Fe uptake systems, including TonB and outer‐membrane receptors, but has a predicted, but incomplete iron uptake ABC‐class transporter operon, whose expression is much enhanced in Fe‐depleted conditions, although a strain lacking these genes was unaffected in growth. The Fe‐specific regulatory network of R. pomeroyi was found to involve the Irr transcriptional regulator, which controlled the expression of several genes. Microarrays revealed many other genes whose expression was enhanced or diminished in Fe‐replete conditions, providing material for future work on the iron regulon of this bacterium, Turning to manganese, here too the expression of many genes was affected (up or down) by Mn availability. These included an operon corresponding to sitABCD, an effective ABC‐type Mn2+ transporter in many other bacteria. This was confirmed, directly, to be the case for Ruegeria. Bioinformatic analyses showed that some other Roseobacter strains lacked any previously known Mn2+ transporter, but instead, had a gene that likely encoded an inner membrane protein and was preceded by a motif (MRS box) that was known to be recognised by the Mn2+ ‐responsive transcriptional regulator Mur. It was confirmed that this gene, termed mntX, did indeed encode a manganese transporter and that MntX orthologues occurred in several other, unrelated marine bacteria, notably most strains of the pathogenic genus Vibrio (including V. cholerae) and some of the most abundant bacteria in the oceans, namely the SAR11 clade (Pelagibacter).

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Barr, David William. "Comparison of iron oxidation by acidophilic bacteria". Thesis, University of Warwick, 1989. http://wrap.warwick.ac.uk/106735/.

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A rang« of obligate acidophilic Iron oxidising bacteria war« compared physiologically, kinetically and biochemically. The organisms ware mesophiles, Thiobacillus ferrooxidans and Leptospirillum ferrooxldans, moderate thermophiles designated strains ALV, BC1, LH2, TH1 and TH3 and thermophlle Sulfolobus BC65. Each organism retained iron oxidizing activity in non-growing cell suspensions. Measurement was made of apparent Km and K. for ferrous Iron oxidation and its inhibition by ferric Iron in these suspensions. Values were derived from three graphical representations of the data. Values differed where identical strains had been previously reported. Evidence of a fixed relationship between Km and K1 suggested that these differences were derived from experimental variation. Ferric iron was a competitive Inhibitor of iron oxidation but copper was an uncompetitive inhibitor of L.ferrooxidans. Responses of calls to ferric Iron during growth indicated the predictive power of suspension kinetics, extremes In batch culture coinciding with the lowest and highest measured values of K. Continuous culture provided evidence of the relevance of this data to growth and explained relative cell numbers during competition in mixed mesophilic culture. These could also explain previously reported observations in mineral cultures. The production of ferric iron was controlled both by pH and process design with T.ferrooxidans. Comparable production was provided with L.ferrooxidans, utilising its ability to form macroscopic cell aggregates in sub- optimal conditions. Optimum growth conditions varied nutritionally with each strain and with particle size, ore mineralogy and carbon dioxide concentration during mineral dissolution by Sulfolobus BC63. The sulphur requirement for growth was strain dependent, quantitatively and qualitatively. Strain ALV indicated that reduced sulphur was not an obligate requirement for thermophilic iron oxidation. Iron oxidation appeared to be the controlling factor in mineral dissolution at 68°C. Iron oxidation was limited prior to maximum target metal release. Based on optical spectra each organism contained a range of (different) respiratory chain components. Both L.ferrooxidans and Sulfolobus BC65 had absorbance maxima not attributable to known cytochrome species. The peak at 578 nm for L.ferrooxidans was due to a red-pigmented, acid stable soluble protein which was reduced by ferrous Iron.

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Kerin, Elizabeth Johanna. "Mercury methylation in dissimilatory iron reducing bacteria". College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7385.

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Thesis (M.S.) -- University of Maryland, College Park, 2007.
Thesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Timmons, John D. III. "Selective Precipitation of Iron in Acid Mine Drainage using Iron-oxidizing Bacteria". Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1525446228184635.

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Chan, Anson Chi-Kit. "Iron transport in two pathogenic Gram-negative bacteria". Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/32406.

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Campylobacter jejuni and Escherichia coli strain F11 are two Gram-negative pathogens with a versatile armament of iron uptake systems to cope with the fluctuating host nutrient environment. Our current understanding of Gram-negative iron uptake systems focuses heavily on a prototypical scheme involving a TonB-dependent outer membrane receptor and an ABC transporter, with little knowledge on systems that do not fall neatly into this paradigm. The primary focus of this thesis is the characterization of three such atypical iron uptake proteins from C. jejuni (ChaN and P19) and pathogenic E. coli (FetP). C. jejuni ChaN is a 30 kDa, iron-regulated lipoprotein hypothesized to be involved in iron uptake. The crystal structure of ChaN reveals that it can bind two cofacial heme groups in a pocket formed by a ChaN dimer. Each heme iron is coordinated by a single tyrosine from one monomer and the propionate groups are hydrogen bonded by a histidine and a lysine from the other monomer. Analytical ultracentrifugation studies demonstrate heme-dependent dimerization in solution. Cell fractionation of C. jejuni shows that ChaN is localized to the outer membrane. Based on these findings, the predicted in vivo role of ChaN in iron uptake is discussed. C. jejuni cFtr1-P19 and E. coli FetMP are homologous iron-regulated systems also proposed to be iron transporters. Through growth studies in both organisms, we show that P19 and FetMP are required for optimal growth under iron-limited conditions. Furthermore, metal binding analysis demonstrates that recombinant P19 and FetP bind both copper and iron. Dimerization of P19 is shown to be metal dependent in vitro and is detected in vivo by cross-linking. Through x-ray crystallography, we have determined the structures of P19 and FetP with various metals bound, thus revealing the locations of the highly conserved copper and iron binding sites. Additionally, the crystal structure of FetP reveals two copper positions in each binding site that is likely functionally important. Through mutagenesis, residues contributing to the alternative copper positions were identified. Together, these studies provide insight into the mechanism of iron transport by the two systems and allow for the development of functional models.

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Marshall, Rowena Margaret. "Thermophilic acidophilic bacteria : iron, sulphur and mineral oxidation". Thesis, University of Warwick, 1985. http://wrap.warwick.ac.uk/2613/.

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The aim of this study was to investigate the iron- and sulphur-oxidizing activities of thermophilic bacteria with reference to the possible use of such bacteria in the extraction of metals from mineral sulphides. The initial characterization of a range of isolates was based on growth studies with iron and sulphur substrates and on the comparison of whole cell protein electrophoresis patterns. Three groups of bacteria were isolated and studied: moderately thermophilic iron- and mineral sulphide-oxidizing bacteria, moderately thermophilic sulphur oxidizers and extremely thermophilic Sulfolobus-like organisms. Both moderately and extremely thermophilic acidophiles were isolated from hot spring and coal pile samples. The moderately thermophilic iron-oxidizing bacteria and the extreme thermophiles which were examined were sub-divided into three and four sub-groups respectively. In a comparative study of continuous flow iron-oxidation reactors, moderate thermophiles did not produce higher rates of ferric iron production than the mesophile T. ferrooxidans but iron oxidation was less sensitive to inhibition by chloride in a vessel containing a thermophile than in a vessel operating with the mesophile. Iron oxidation during autotrophic growth of moderately thermophilic acidophiles and the rapid dissolution of mineral sulphides during the autotrophic growth of both the moderate and the extreme thermophiles were demonstated, thus considerably increasing the potential industrial significance of these bacteria. The yield of soluble copper from a chalcopyrite concentrate was shown to increase with temperature from relatively low yields with the mesophile T. ferrooxidans, through moderate yields with the moderately thermophilic bacteria to almost complete mineral solubilization with the newly isolated Sulfolobus strains.

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Libri sul tema "Iron bacteria"

1

Crosa, Jorge H., Alexandra R. Mey e Shelley M. Payne, a cura di. Iron Transport in Bacteria. Washington, DC, USA: ASM Press, 2004. http://dx.doi.org/10.1128/9781555816544.

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MacLean, Martin. Autotrophy in iron-oxidizing, acidophilic bacteria. [s.l.]: typescript, 1993.

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3

Hampshire), Conference on Iron Biominerals (1989 University of New. Iron biominerals. New York: Plenum Press, 1991.

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Lazurenko, V. I. Geologicheskai͡a︡ dei͡a︡telʹnostʹ zhelezobakteriĭ. Kiev: Nauk. dumka, 1989.

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5

Barr, David William. Comparison of iron oxidation by acidophilic bacteria. [s.l.]: typescript, 1989.

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Marsh, Rowena Margaret. Thermophilic acidophilic bacteria: Iron, sulphur and mineral oxidation. [s.l.]: typescript, 1985.

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7

Geological Survey (U.S.), a cura di. Sites in the Virginia-Washington, D.C.-Maryland metro area to observe or collect bacteria that precipitate iron and manganese oxides. [Reston, Va.?: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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8

Geological Survey (U.S.), a cura di. Sites in the Virginia-Washington, D.C.-Maryland metro area to observe or collect bacteria that precipitate iron and manganese oxides. [Reston, Va.?: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Geological Survey (U.S.), a cura di. Sites in the Virginia-Washington, D.C.-Maryland metro area to observe or collect bacteria that precipitate iron and manganese oxides. [Reston, Va.?: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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10

Geological Survey (U.S.), a cura di. Sites in the Virginia-Washington, D.C.-Maryland metro area to observe or collect bacteria that precipitate iron and manganese oxides. [Reston, Va.?: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Capitoli di libri sul tema "Iron bacteria"

1

Schmidt, Wolf-Dieter, e Jürgen Overbeck. "Iron Bacteria". In Ecological Studies, 326–36. New York, NY: Springer New York, 1994. http://dx.doi.org/10.1007/978-1-4612-2606-2_15.

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Hantke, Klaus. "Ferrous Iron Transport". In Iron Transport in Bacteria, 178–84. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555816544.ch12.

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Walsh, Christopher T., e C. Gary Marshall. "Siderophore Biosynthesis in Bacteria". In Iron Transport in Bacteria, 18–37. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555816544.ch2.

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Raymond, Kenneth N., e Emily A. Dertz. "Biochemical and Physical Properties of Siderophores". In Iron Transport in Bacteria, 1–17. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555816544.ch1.

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Klebba, Phillip E. "Transport Biochemistry of FepA". In Iron Transport in Bacteria, 147–57. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555816544.ch10.

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Braun, Volkmar, Michael Braun e Helmut Killmann. "Ferrichrome- and Citrate-Mediated Iron Transport". In Iron Transport in Bacteria, 158–77. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555816544.ch11.

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de Lorenzo, Víctor, José Perez-Martín, Lucía Escolar, Graziano Pesole e Giovanni Bertoni. "Mode of Binding of the Fur Protein to Target DNA: Negative Regulation of Iron-Controlled Gene Expression". In Iron Transport in Bacteria, 185–96. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555816544.ch13.

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Payne, Shelley M., e Alexandra R. Mey. "Pathogenic Escherichia coli, Shigella, and Salmonella". In Iron Transport in Bacteria, 197–218. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555816544.ch14.

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Perry, Robert D. "Yersinia". In Iron Transport in Bacteria, 219–40. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555816544.ch15.

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Di Lorenzo, Manuela, Michiel Stork, Alejandro F. Alice, Claudia S. López e Jorge H. Crosa. "Vibrio". In Iron Transport in Bacteria, 241–55. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555816544.ch16.

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Atti di convegni sul tema "Iron bacteria"

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Poiata, A., Al Vlahovici, D. E. Creanga e R. C. Mocanasu. "Fluorescent bacteria for colloidal iron biosensors". In Microelectronics, MEMS, and Nanotechnology, a cura di Dan V. Nicolau. SPIE, 2005. http://dx.doi.org/10.1117/12.648970.

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Zhang, Chuanlun, Hojatollah Vali, Shi Liu, Yul Roh, Dave Cole, Joseph L. Kirschvink, Tullis C. Onstott, David S. McKay e Tommy J. Phelps. "Formation of magnetite and iron-rich carbonates by thermophilic iron-reducing bacteria". In Optical Science, Engineering and Instrumentation '97, a cura di Richard B. Hoover. SPIE, 1997. http://dx.doi.org/10.1117/12.278809.

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Byrne, James. "Iron biogeobatteries: Interactions with bacteria and metal contaminants". In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.16842.

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Wee, Seng Kew, Mawaddah Abdul Khaliq, Wei Tieng Owi, Raveenthiran Rajan e Sheikh Abdul Rezan Sheikh Abdul Hamid. "Reductive dissolution of iron (III) from ilmenite ore (FeTiO3) by iron reducing bacteria". In ADVANCES IN FRACTURE AND DAMAGE MECHANICS XX. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0149211.

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Cerclet, Léo, Gabrielle Beaudry e Philippe Pasquier. "Combined thermal response test and coupon test to anticipate clogging issues in standing column wells". In International Ground Source Heat Pump Association. International Ground Source Heat Pump Association, 2024. http://dx.doi.org/10.22488/okstate.24.000016.

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Standing column wells use groundwater as the heat carrier fluid and are therefore susceptible to different clogging processes that can vary depending on the hydrogeological and geochemical conditions of the subsurface. In order to anticipate the nature and potential risk of clogging within the operational framework of a ground heat exchanger, this work proposes a new approach including a deposition cell containing coupons made of materials commonly used in HVAC applications in a thermal response test unit. A demonstration was performed in a standing column well to assess the efficiency of the proposed method. The coupon test unveiled a tendency towards iron precipitation and the development of iron-oxidizing bacteria, which was in accordance with the results of a more conventional groundwater analysis. Nonetheless, an advanced analysis of the coupons conducted with scanning electron microscopy and energy-dispersive X-ray spectroscopy also highlighted the higher vulnerability of 304 stainless steel to iron-related bacterial growth, compared with HDPE or copper. Moreover, it also allowed the identification of the interaction between bacteria and sediment deposition on the stainless steel coupon.

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Kettler, Richard M., Yongsheng He, Shan Ke, David B. Loope e Karrie A. Weber. "LIMITED IRON ISOTOPE FRACTIONATION IN CONCRETIONS PRODUCED BY IRON-OXIDIZING BACTERIA, NAVAJO SANDSTONE, UTAH (USA)". In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-286866.

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Pham, Anh, Olivier Aumont, Lavenia Ratnarajah e Alessandro Tagliabue. "Evaluating the impact of heterotrophic bacteria on ocean iron cycling". In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.7076.

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Janakova, Iva, Barbora Fejfarova, Oldrich Sigut e Vladimir Cablik. "Utilisation of Acidithiobacillus Ferrooxidans Bacteria for Bioleaching of Waste Materials from Silver-Bearing Ore Mining". In 4th International Conference on Advances in Environmental Engineering. Switzerland: Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-o8cism.

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The extraction and processing of silver minerals produce significant amounts of waste, which poses environmental challenges due to their low metal content and the potential release of toxic elements. The study investigates the application of Acidithiobacillus ferrooxidans (AF) bacteria to the bioleaching of these waste materials, with the aim of maximizing the recovery of iron, copper and arsenic. The objectives of the study include characterizing waste materials, optimizing the bioleaching process parameters and evaluating metal extraction efficiency. The samples were leached with additives (CuSO4 5H2O and AgNO3) to accelerate the kinetics of metal dissolution in solution and reduce the bacterial leaching time. The results showed that samples 1-2 and 2-2 containing additives had higher values of dissolved iron and copper in the leachate compared to samples 1-1 and 2-1 without additive application.

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Sultana, Sharmin, Md Sad Salabi Sawrav, Snygdha Rani Das, Mehfuz Alam, Md Abdul Aziz, Md Al-Amin Hossain e Md Azizul Haque. "Isolation and Biochemical Characterization of Cellulase Producing Goat Rumen Bacteria". In International Conference on Emerging Trends in Engineering and Advanced Science. AIJR Publisher, 2022. http://dx.doi.org/10.21467/proceedings.123.12.

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Cellulose is the most prevalent polymer on the planet and has long been utilized for a variety of industrial applications. The study's goal was to screen and isolate cellulase-producing bacteria from the rumen of a goat collected from different location of Dinajpur district. To do so, rumen content samples from two distinct goats were collected. In this investigation, rumen cellulase-producing bacteria were isolated and characterized after serial dilution of five isolates up to six fold and inoculation into Nutrient agar. Following that, all of the isolates were underwent Methyl Red (MR) test & Voges-Proskauer (VP) test to identify organism’s metabolic pathway, Triple Sugar Iron Agar (TSI) Test to determine bacterial ability to utilize sugar, Motility Indole and Urease activity test (MIU) to determine motility, Urease utilization and can produce Indole or not, Citrate utilization test to utilize citrate as carbon and energy source, Oxidase test, Catalase test to check the presence of catalytic enzyme. The result revealed the colonial characterization of bacteria and also where proven all five isolates are promising enough and superior in quality to produce cellulose.

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Kovalick, Francis, Andrey Bekker, Andy Heard, Aleisha Johnson, Nicolas Dauphas, Clara Chan e Luke Ootes. "WERE MICROAEROPHILIC IRON-OXIDIZING BACTERIA RESPONSIBLE FOR THE DEPOSITION OF CA. 1.88 GA GRANULAR IRON FORMATIONS?" In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-370505.

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Rapporti di organizzazioni sul tema "Iron bacteria"

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Burgos, W. D. Impact of Iron-Reducing Bacteria on Metals and Radionuclides Adsorbed to Humic-Coated Iron(III) Oxides. Office of Scientific and Technical Information (OSTI), febbraio 2005. http://dx.doi.org/10.2172/876706.

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Zhou, J., S. V. Liu, C. Zhang, A. V. Palumbo e T. J. Phelps. Extremophilic iron-reducing bacteria: Their implications for possible life in extraterrestrial environments. Office of Scientific and Technical Information (OSTI), giugno 1998. http://dx.doi.org/10.2172/661536.

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Hayes, Kim F., Yuqiang Bi, Julian Carpenter, Sung Pil Hyng, Bruce E. Rittmann, Chen Zhou, Raveender Vannela e James A. Davis. Assessing the Role of Iron Sulfides in the Long Term Sequestration of Uranium by Sulfate-Reducing Bacteria. Office of Scientific and Technical Information (OSTI), dicembre 2013. http://dx.doi.org/10.2172/1121431.

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Rittman, Bruce, Chen Zhou e Raveender Vannela. Assessing the Role of Iron Sulfides in the Long Term Sequestration of U by Sulfate Reducing Bacteria. Office of Scientific and Technical Information (OSTI), dicembre 2013. http://dx.doi.org/10.2172/1149699.

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Lenly J. Weathers e Lynn E. Katz. Reduction and Immobilization of Radionuclides and Toxic Metal Ions Using Combined Zero Valent Iron and Anaerobic Bacteria. Office of Scientific and Technical Information (OSTI), maggio 2002. http://dx.doi.org/10.2172/795018.

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Magnuson, T. S. Comparative biochemistry and physiology of iron-respiring bacteria from acidic and neutral-pH environments: Final Technical Report. Office of Scientific and Technical Information (OSTI), aprile 2009. http://dx.doi.org/10.2172/950869.

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Mendoza, Jonathan Alberto, Carolina Mazo, Lina Margarita Conn, Álvaro Rincón Castillo, Daniel Rojas Tapias e Ruth Bonilla Buitrago. Evaluation of phosphate-solubilizing bacteria associated to pastures of Bracharia from acid soils. Corporación Colombiana de Investigación Agropecuaria - AGROSAVIA, 2015. http://dx.doi.org/10.21930/agrosavia.informe.2015.5.

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Rhizobia have been widely known by their capacity to form a symbiotic relationship with legumes and fix atmospheric nitrogen. Recently, however, rhizobia have shown to associate with plants in different botanical families. In this study, we aimed at elucidating the diversity of rhizobia associated to grasses, and determine their capabilities to solubilize phosphate in both lab and greenhouse experiments. Isolation of rhizobia was performed using rhizosphere from Brachiaria brizantha and B. decumbens and a promiscuous legume trap plant (i.e. Vigna unguiculata). Thirty days after inoculation of the trap plant, rhizobia were isolated from nodules using the conventional protocol, classified in basis on their phenotypic features, and molecularly grouped using Amplified Ribosomal DNA Restriction Analysis (ARDRA). Finally, phosphate solubilization assays and greenhouse experiments were carried out on representatives of each ARDRA cluster. The results showed that the diversity of rhizobia varied between both plant species, which suggests that plant exudates significantly determine the composition of the plant microbiome. Surprisingly, most of the isolated associated to B. brizantha rhizosphere exhibited typical attributes of slow-growing rhizobia, whereas rhizobia from B. decumbens displayed a mixed diversity including slow-, intermediate-, and fast-growing rhizobia. Sequencing of 16S rRNA of ARDRA representatives showed that most of the rhizobia isolated from B. brizantha belonged to the Mesorhizobium and Bradyrhizobium genera, while those isolated from B. decumbens were phylogenetically clustered into Rhizobium and Bradyrhizobium. The capability of the isolates to solubilize phosphate was studied using iron and calcium phosphate. We observed that overall Bradyrhizobium exhibited the highest ability to solubilize iron phosphate; by contrast, calcium phosphate was similarly solubilized within representatives of the three genera. In greenhouse experiments, we found that plants inoculated with isolated BT53, BD17 and BD21 exhibited a significantly higher content of phosphorus (p≤0.05). Additionally, dry weight was significantly higher in the treatment inoculated with BT16 isolate (p≤0.05). We conclude that 1) rhizobia is found associated with grasses, 2) plant genotype determines rhizobia diversity 3) rhizobia are able to solubilize phosphorus, and 4) they might be used to promote plant in different plant families. We further believe that further studies will reveal the true role of those old-known legume symbionts in development and growth of other important crops.

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Yang, Ming, Youwei Wu, Tao Wang e Wentao Wang. Iron overload, Infectious Complications and Survival In Liver Transplant Recipients: A Systematic Review and Meta-Analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, novembre 2022. http://dx.doi.org/10.37766/inplasy2022.11.0022.

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Review question / Objective: Iron overload conditions is a well-established risk factor for infection of pathogens. The possible association of iron overload with infectious complications and prognosis of patients receiving transplants are not well understood. Condition being studied: Liver transplantation often represents a life-saving treatment for an increasing number of patients with end-stage liver disease. With the improvements in surgical techniques, immunosuppression strategies, and post-LT management of complications, the recipient mortality has steadily declined after LT. The survival rates were 83% at 1 year, 71% at 5 years in western countries. However, the use of immunosuppressants increased risk of infections as an adverse effect resulting in severe morbidity. Globally, infection caused by including bacteria, fungus, viruses remain one of the leading causes of morbidity and mortality among transplant recipients. Knowledge of modifiable risk factors and potentially reversible causes is essential to develop targeted preventive strategies.

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Weathers, L. Reduction and immobilization of radionuclides and toxic metal ions using combined zero valent iron and anaerobic bacteria. 1998 annual progress report. Office of Scientific and Technical Information (OSTI), giugno 1998. http://dx.doi.org/10.2172/13474.

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Cytryn, Eddie, Mark R. Liles e Omer Frenkel. Mining multidrug-resistant desert soil bacteria for biocontrol activity and biologically-active compounds. United States Department of Agriculture, gennaio 2014. http://dx.doi.org/10.32747/2014.7598174.bard.

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Control of agro-associated pathogens is becoming increasingly difficult due to increased resistance and mounting restrictions on chemical pesticides and antibiotics. Likewise, in veterinary and human environments, there is increasing resistance of pathogens to currently available antibiotics requiring discovery of novel antibiotic compounds. These drawbacks necessitate discovery and application of microorganisms that can be used as biocontrol agents (BCAs) and the isolation of novel biologically-active compounds. This highly-synergistic one year project implemented an innovative pipeline aimed at detecting BCAs and associated biologically-active compounds, which included: (A) isolation of multidrug-resistant desert soil bacteria and root-associated bacteria from medicinal plants; (B) invitro screening of bacterial isolates against known plant, animal and human pathogens; (C) nextgeneration sequencing of isolates that displayed antagonistic activity against at least one of the model pathogens and (D) in-planta screening of promising BCAs in a model bean-Sclerotiumrolfsii system. The BCA genome data were examined for presence of: i) secondary metabolite encoding genes potentially linked to the anti-pathogenic activity of the isolates; and ii) rhizosphere competence-associated genes, associated with the capacity of microorganisms to successfully inhabit plant roots, and a prerequisite for the success of a soil amended BCA. Altogether, 56 phylogenetically-diverse isolates with bioactivity against bacterial, oomycete and fungal plant pathogens were identified. These strains were sent to Auburn University where bioassays against a panel of animal and human pathogens (including multi-drug resistant pathogenic strains such as A. baumannii 3806) were conducted. Nineteen isolates that showed substantial antagonistic activity against at least one of the screened pathogens were sequenced, assembled and subjected to bioinformatics analyses aimed at identifying secondary metabolite-encoding and rhizosphere competence-associated genes. The genome size of the bacteria ranged from 3.77 to 9.85 Mbp. All of the genomes were characterized by a plethora of secondary metabolite encoding genes including non-ribosomal peptide synthase, polyketidesynthases, lantipeptides, bacteriocins, terpenes and siderophores. While some of these genes were highly similar to documented genes, many were unique and therefore may encode for novel antagonistic compounds. Comparative genomic analysis of root-associated isolates with similar strains not isolated from root environments revealed genes encoding for several rhizospherecompetence- associated traits including urea utilization, chitin degradation, plant cell polymerdegradation, biofilm formation, mechanisms for iron, phosphorus and sulfur acquisition and antibiotic resistance. Our labs are currently writing a continuation of this feasibility study that proposes a unique pipeline for the detection of BCAs and biopesticides that can be used against phytopathogens. It will combine i) metabolomic screening of strains from our collection that contain unique secondary metabolite-encoding genes, in order to isolate novel antimicrobial compounds; ii) model plant-based experiments to assess the antagonistic capacities of selected BCAs toward selected phytopathogens; and iii) an innovative next-generation-sequencing based method to monitor the relative abundance and distribution of selected BCAs in field experiments in order to assess their persistence in natural agro-environments. We believe that this integrated approach will enable development of novel strains and compounds that can be used in large-scale operations.

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