Bibliografie tematiche / Marine bacteria

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Letteratura scientifica selezionata sul tema "Marine bacteria"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 4 maggio 2024

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Articoli di riviste sul tema "Marine bacteria"

1

Abdul Nabi, Y. Z. Ahmed, A. N. Jatt, S. A. Tunio, A. S. Qureshi, S. B. Memon e S. M. Abbassi. "INVESTIGATION OF N-ACYL HOMOSERINE LACTONE-BASED QUORUM-SENSING SYSTEM AND ALIGINATE LYASE ACTIVITY IN MARINE BACTERIAL SPECIES OF GRIMONTIA MARINA AS01 AND ALTEROMONAS MACLEODII AS02". Pakistan Journal of Science 74, n. 1-1 (27 marzo 2023): 25–31. http://dx.doi.org/10.57041/pjs.v74i1-1.905.

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Production, detection, and reaction to external signaling molecules are essential steps in quorum sensing (QS) process. Through the use of QS, bacterial communities may synchronize their responses to shifts in the density and diversity of their vicinal neighbors. QS also play an important role in regulating enzmyatic activities among marine bacteria. The aim of the present study was to detect and identify N- acyl homoserine lactones (AHLs) based QS signaling molecules and the possible influence on alginate lyase in marine bacterial isolates of Grimontia marina AS01 and Alteromonas macleodi AS02. Marine water samples were collected from Arabian Sea, Karchi Pakistan, following the standard collection methods. Bacterial strains were isolated and pure cultured using Zobell 2216 marine medium. Molecular identification was achieved based on 16S rRNA gene analysis. Screening for AHLs was achieved using Agrobacterium tumefaciens A136 as a biosensor. Based on 16S rRNA analysis, the bacterial strains were identified as Grimontia marina strain AS01 (OP143768) and Alteromonas macleodii strain AS02 (OP143769). Cross-feeding bioassay revealed the positive reactions for the production of AHLs. Reversed phase-TLC analysis showed the identification of C6-HSL produced by G. marina AS01 and 3OXO-C6-HSL by A. macleodii AS02 strain. Moreover, QS inhibitor AiiA protein reduced the production of alginate lyase in A. macleodi AS02, while no effect was observed in G. marina AS01. These results substantiate the involvement of QS system in regulating alginate lyase activity in A. macleodii AS02. QS in marine bacteria may involve in hydrolysis of complex organic matter in marine environment.
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2

Jeganathan, P., K. M. Rajasekaran, N. K. Asha Devi e S. Karuppusamy. "Antimicrobial activity and Characterization of Marine bacteria". Indian Journal of Pharmaceutical and Biological Research 1, n. 04 (31 dicembre 2013): 38–44. http://dx.doi.org/10.30750/ijpbr.1.4.8.

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Marine bacteria were isolated from seawater was collected from different coastal areas of the Tamilnadu Sea. The antimicrobial activities of these bacteria were investigated. Ethyl acetate extracts of marine bacterial fermentation were screened for antimicrobial activities using the method of agar diffusion. The results showed that 25 strains of the isolates have antimicrobial activity. The proportion of active bacteria associated with isolated from seawater. The active marine bacteria were assigned to the genera Alteromonas, Pseudomonas, Bacillus and Marinobacter. The TLC autobiographic overlay assay implied that the antimicrobial metabolites produced by four strains with wide antimicrobial spectrum were different. These marine bacteria were expected to be potential resources of natural antibiotic products. It can be concluded that isolation of Marine bacterial samples can offer a numbers of microbial strains for sources of new biomolecules from Marine sources.
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3

Hopkinson, Brian M., Kelly L. Roe e Katherine A. Barbeau. "Heme Uptake by Microscilla marina and Evidence for Heme Uptake Systems in the Genomes of Diverse Marine Bacteria". Applied and Environmental Microbiology 74, n. 20 (29 agosto 2008): 6263–70. http://dx.doi.org/10.1128/aem.00964-08.

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ABSTRACT The ability to acquire diverse and abundant forms of iron would be expected to confer a survival advantage in the marine environment, where iron is scarce. Marine bacteria are known to use siderophores and inorganic iron, but their ability to use heme, an abundant intracellular iron form, has only been examined preliminarily. Microscilla marina, a cultured relative of a bacterial group frequently found on marine particulates, was used as a model organism to examine heme uptake. Searches of the genome revealed analogs to known heme transport proteins, and reverse transcription-quantitative PCR analysis of these genes showed that they were expressed and upregulated under iron stress and during growth on heme. M. marina was found to take up heme-bound iron and could grow on heme as a sole iron source, supporting the genetic evidence for heme transport. Similar putative heme transport components were identified in the genomes of diverse marine bacteria. These systems were found in the genomes of many bacteria thought to be particle associated but were lacking in known free-living organisms (e.g., Pelagibacter ubique and marine cyanobacteria). This distribution of transporters is consistent with the hydrophobic, light-sensitive nature of heme, suggesting that it is primarily available on phytoplankton or detritus or in nutrient-rich environments.
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Borges, Anabela, e Manuel Simões. "Quorum Sensing Inhibition by Marine Bacteria". Marine Drugs 17, n. 7 (23 luglio 2019): 427. http://dx.doi.org/10.3390/md17070427.

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Antibiotic resistance has been increasingly reported for a wide variety of bacteria of clinical significance. This widespread problem constitutes one of the greatest challenges of the twenty-first century. Faced with this issue, clinicians and researchers have been persuaded to design novel strategies in order to try to control pathogenic bacteria. Therefore, the discovery and elucidation of the mechanisms underlying bacterial pathogenesis and intercellular communication have opened new perspectives for the development of alternative approaches. Antipathogenic and/or antivirulence therapies based on the interruption of quorum sensing pathways are one of several such promising strategies aimed at disarming rather than at eradicating bacterial pathogens during the course of colonization and infection. This review describes mechanisms of bacterial communication involved in biofilm formation. An overview of the potential of marine bacteria and their bioactive components as QS inhibitors is further provided.
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5

Satishbabu, Kakumanu, e Prasuna Ravi Gyana. "A study to determine effect of metal ions for optimization of L-Asparaginase producers for bioprocessing". Research Journal of Biotechnology 18, n. 9 (15 agosto 2023): 88–97. http://dx.doi.org/10.25303/1809rjbt088097.

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The present study encompasses isolation of marine bacteria from marine soil samples collected from Chirala, Coastal area of Andhra Pradesh. Work includes isolation, screening, morphological and molecular characterization of selected L- Asparaginase producers. Purified enzyme was used for enzyme kinetic studies. Marine soil sample was collected in sterile bottle and brought to the lab bench and a total of 12 morphologically distinct bacterial colonies were isolated from collected marine soil samples and coded as Chirala Marine Bacteria. All 12 Chirala Marine Bacteria isolates were qualitatively screened for L-Asparaginase production. Out of 12 Chirala marine bacteria isolates, 9 isolates show positive response to L-Asparaginase activity. Effect of inducers i.e. carbon, nitrogen, aminoacids, phosphates and metal ions was studied.
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6

Lee, Yoo Kyung, Kae Kyoung Kwon, Kyeung Hee Cho, Jae Hyun Park e Hong Kum Lee. "Isolation and Identification of Bacteria from Marine Biofilms". Key Engineering Materials 277-279 (gennaio 2005): 612–17. http://dx.doi.org/10.4028/www.scientific.net/kem.277-279.612.

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In the marine environment, biofilms cover most of the subtidal and intertidal solid surfaces. Culturable bacteria forming marine biofilms were isolated on artificial substrate called acrylic coupons. The bacterial isolates were identified through a comparison of 16S rDNA sequences. A total of 115 strains were cultured and identified, 45 of which showed the same sequences with other strains. Therefore, 70 strains were finally identified. The bacterial isolates belonged to a–Proteobacteria (32 isolates), g–Proteobacteria (12 isolates), CFB group bacteria (4 isolates), high GC Gram-positive bacteria (9 isolates), and low GC Gram-positive bacteria (13 isolates). The bacterial isolates may be used as standard bacteria to test new antifouling agent. They may also be utilized as useful bacteria to enhance the settlement of commercial algae and invertebrate larvae for aquaculture.
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Kim, Hyo-Ryeon, Jae-Hyun Lim, Ju-Hyoung Kim e Il-Nam Kim. "Collection of Environmental Variables and Bacterial Community Compositions in Marian Cove, Antarctica, during Summer 2018". Data 6, n. 3 (5 marzo 2021): 27. http://dx.doi.org/10.3390/data6030027.

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Marine bacteria, which are known as key drivers for marine biogeochemical cycles and Earth’s climate system, are mainly responsible for the decomposition of organic matter and production of climate-relevant gases (i.e., CO₂, N₂O, and CH₄). However, research is still required to fully understand the correlation between environmental variables and bacteria community composition. Marine bacteria living in the Marian Cove, where the inflow of freshwater has been rapidly increasing due to substantial glacial retreat, must be undergoing significant environmental changes. During the summer of 2018, we conducted a hydrographic survey to collect environmental variables and bacterial community composition data at three different layers (i.e., the seawater surface, middle, and bottom layers) from 15 stations. Of all the bacterial data, 17 different phylum level bacteria and 21 different class level bacteria were found and Proteobacteria occupy 50.3% at phylum level following Bacteroidetes. Gammaproteobacteria and Alphaproteobacteria, which belong to Proteobacteria, are the highest proportion at the class level. Gammaproteobacteria showed the highest relative abundance in all three seawater layers. The collection of environmental variables and bacterial composition data contributes to improving our understanding of the significant relationships between marine Antarctic regions and marine bacteria that lives in the Antarctic.
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Long, Richard A., e Farooq Azam. "Antagonistic Interactions among Marine Pelagic Bacteria". Applied and Environmental Microbiology 67, n. 11 (1 novembre 2001): 4975–83. http://dx.doi.org/10.1128/aem.67.11.4975-4983.2001.

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ABSTRACT Recent studies suggest that bacterial abundance and species diversity in the ocean's water column are variable at the millimeter scale, apparently in response to the small-scale heterogeneity in the distribution of organic matter. We hypothesized that bacterium-bacterium antagonistic interactions may contribute to variations in community structure at the microscale. We examined each of the 86 isolates for their inhibition of growth of the remaining 85 isolates by the Burkholder agar diffusion assay. More than one-half of the isolates expressed antagonistic activity, and this trait was more common with particle-associated bacteria than with free-living bacteria. This was exemplified by members of the α subclass of the class Proteobacteria (α-proteobacteria), in which production of antagonistic molecules was dominated by attached bacteria. We found that γ-proteobacteria (members of the ordersAlteromonadales and Vibrionales) are the most prolific producers of inhibitory materials and also the most resilient to them, while members of the Bacteriodetes were the organisms that were least productive and most sensitive to antagonistic interactions. Widespread interspecies growth inhibition is consistent with the role of this phenomenon in structuring bacterial communities at the microscale. Furthermore, our results suggest that bacteria from pelagic marine particles may be an underutilized source of novel antibiotics.
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9

Pathiraja, Pathiraja Mudiyanselage Duleepa, e In-Geol Choi. "해양 종속영양세균의 한천대사에 대한 새로운 통찰". Institute of Life Science and Natural Resources 30 (31 dicembre 2022): 53–65. http://dx.doi.org/10.33147/lsnrr.2022.30.1.53.

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Agar is a key structural polysaccharide of red macroalgae which provides a rich habitat for marine heterotrophic bacteria in marine ecosystems. Marine agarolytic bacteria, that can use agar as the sole carbon source, are distributed in diverse marine environments from open coastal waters to the gut of marine herbivores. Agarolytic bacteria employ a combination of carbohydrate-active enzymes (CAZymes) for the depolymerization of agar. Extensive studies on the genomic architecture of the agarolytic bacteria suggested that genes encoding these CAZymes are arranged in polysaccharide utilization loci (PUL). Agar hydrolyzing enzymes (agarases) are categorized into; β-agarase (GH16, GH50, GH86, and GH118), α-agarase (GH96), neoagarooligosaccharide hydrolase (GH117), and agarolytic β-galactosidase (GH2). The molecular functionality, structural elements, and catalytic mechanisms of agarases belonging to different GH families show unique characteristics. L-AHG, one of the main constituents in agar, is a rare monosaccharide and its metabolic pathway is exclusively found in marine agarolytic bacteria. Recent trends in the agarolytic systems are mostly focused on the sequence data to visualize the universal agarolytic enzyme repertoire and the evolution of the agarolytic pathway in marine heterotrophic bacteria. In addition, increasing attention is paid to understanding the oligosaccharide transport mechanisms and transcriptional regulation of genes in PUL. In this review, we will cover a comprehensive overview of genomic architecture, structural and functional analysis of agar hydrolyzing enzymes, and agar metabolism in marine heterotrophic bacteria.
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Zhao, Jing, Xinyun Li, Xiyan Hou, Chunshan Quan e Ming Chen. "Widespread Existence of Quorum Sensing Inhibitors in Marine Bacteria: Potential Drugs to Combat Pathogens with Novel Strategies". Marine Drugs 17, n. 5 (8 maggio 2019): 275. http://dx.doi.org/10.3390/md17050275.

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Quorum sensing (QS) is a phenomenon of intercellular communication discovered mainly in bacteria. A QS system consisting of QS signal molecules and regulatory protein components could control physiological behaviors and virulence gene expression of bacterial pathogens. Therefore, QS inhibition could be a novel strategy to combat pathogens and related diseases. QS inhibitors (QSIs), mainly categorized into small chemical molecules and quorum quenching enzymes, could be extracted from diverse sources in marine environment and terrestrial environment. With the focus on the exploitation of marine resources in recent years, more and more QSIs from the marine environment have been investigated. In this article, we present a comprehensive review of QSIs from marine bacteria. Firstly, screening work of marine bacteria with potential QSIs was concluded and these marine bacteria were classified. Afterwards, two categories of marine bacteria-derived QSIs were summarized from the aspects of sources, structures, QS inhibition mechanisms, environmental tolerance, effects/applications, etc. Next, structural modification of natural small molecule QSIs for future drug development was discussed. Finally, potential applications of QSIs from marine bacteria in human healthcare, aquaculture, crop cultivation, etc. were elucidated, indicating promising and extensive application perspectives of QS disruption as a novel antimicrobial strategy.
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Più fonti

Tesi sul tema "Marine bacteria"

1

Al-Zereini, Wael. "Natural products from marine bacteria". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982197985.

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2

Cox, Michael J. "Marine methyl halide-utilising bacteria". Thesis, University of Warwick, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426740.

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Simmons, Sheri Lynn. "Geobiology of marine magnetotactic bacteria". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/34276.

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Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Biology; and the Woods Hole Oceanographic Institution), 2006.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references.
Magnetotactic bacteria (MTB) biomineralize intracellular membrane-bound crystals of magnetite (Fe3O4) or greigite (Fe3S4), and are abundant in the suboxic to anoxic zones of stratified marine environments worldwide. Their population densities (up to 105 cells ml-1) and high intracellular iron content suggest a potentially significant role in iron cycling, but very little is known about their population dynamics and regulation by environmental geochemistry. The MTB community in Salt Pond (Falmouth, MA), a small stratified marine basin, was used as a model system for quantitative community studies. Magnetiteproducing MTB predominate slightly above the oxic-anoxic interface and greigiteproducing MTB predominate in sulfidic waters. A quantitative PCR (QPCR) assay was developed and applied to enumerate four major groups of MTB in Salt Pond: magnetite-producing cocci, barbells, the greigite-producing many-celled magnetotactic prokaryote (MMP), and a greigite-producing rod. The barbells were identified as [delta]-Proteobacteria while the rod was identified as the first MTB in the [gamma]-Proteobacteria.
(cont.) The previously thought to be a single species, consists of at least five clades with greater than 5% divergence in their 16s rRNA. Fluorescent in situ hybridization probes showed significant variation in clade abundances across a seasonal cycle in salt marsh productivity. FISH also showed that aggregates consist of genetically identical cells. QPCR data indicated that populations are finely layered around the oxic-anoxic interface: cocci immediately above the dissolved Fe(II) peak, barbells immediately below, the MMP in microsulfidic waters, and the greigite-producing rod in low numbers (100 cells ml-1) below the gradient region. The barbell reached 1-10% of total eubacteria in the late season, and abundances of cocci and barbells appeared to vary inversely. Calculations based on qPCR data suggest that MTB are significant unrecognized contributors to iron flux in stratified environments. Barbells can respond to high oxygen levels by swimming toward geomagneticsouth, the opposite of all previously reported magnetotactic behavior. This behavior is at least partially dependent on environmental oxidation-reduction potential. The co-existence of MTB with opposing polarities in the same redox environment conflicts with current models of the adaptive value of magnetotaxis.
by Sheri Lynn Simmons.
Ph.D.
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4

Chin, Jason. "Aminophosphonate metabolism by marine bacteria". Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.676275.

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Phosphorus plays a crucial role in biology, and so microorganisms have developed many ways of obtaining phosphorus including the catabolism of aminoalkylphosphonates. Previous studies have led to a model of phosphonate use only as a phosphorus source by phosphorus starved marine microorganisms. However, a small number of terrestrial bacteria can use specific phosphonates as a carbon or nitrogen source when not phosphorus starved, but this possibility has not been investigated in marine organisms. Enrichment cultures confirmed that phosphonates are bioavailable phosphorus sources for marine bacteria and also that AMPA, 2AEP, OH2AEP and PnAI can support growth as nitrogen sources even in the presence of phosphate. Twelve isolates from these cultures grew using 2AEP as the sole nitrogen source despite exogenous phosphate addition. Cell-free extracts showed that four isolates catabolised PnAcHyde to produce Pi and an aldehyde, characteristic of a PhnX enzyme. The remaining isolates catabolised PnAc to release Pi and acetate, characteristic of a PhnA enzyme. While these enzymes are known to be involved the degradation of 2AEP under phosphorus starvation this is the first demonstration of marine bacteria capable of phosphate-insensitive 2AEP catabolism by these enzymes. Another isolate used OH2AEP and 2AEP as nitrogen sources even with exogenous phosphate addition. OH2AEP degradation enzymes, induced by OH2AEP, produce an aldehyde, Pi and ammonium, consistent with the proposed HpnWX pathway. The aldehyde could not be identified. A collection of inhibition, product and cofactor studies showed that 2AEP catabolism is carried out by an unusual PhnWA pathway. Therefore marine microorganisms can use some aminoalkylphosphonates as nitrogen sources regardless of Pi concentrations, despite the current model of marine phosphonate catabolism excluding this possibility. This is achieved using a mixture of characterised and previously undescribed C-P cleavage pathways. As such we need to reconsider the importance of aminoalkylphosphonates to microbial nutrition and marine biogeochemistry.
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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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Villarreal-Chiu, J. F. "Organic phosphonate metabolism by marine bacteria". Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557849.

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Phosphonates are a family of organophosphorus compounds characterized by the presence of a carbon- phosphorus bond. This bond provides greater chemical stability compared with analogous compounds containing the more reactive carbon-oxygen-phosphorus linkage (Quinn et al., 2007). Hence, it is important to consider their accumulation in the environment and possible toxic threat to ecosystems. This study explored the distribution ofphosphonate metabolic pathways among sequenced microorganisms and their prevalence and occurrence in the environmental metagenomic database using bioinformatic tools. Experiments carried out on a number of marine representative strains confirmed the capacity of their predicted phosphonate catabolic enzymes to utilize phosphonates for bacterial growth when supplied as phosphorus and to some extent, as nitrogen sources. The bacterium Roseovarius nubinhibens ISM was able to . produce methane through the aerobic degradation of methylphosphonate even in the presence of Pi concentrations up to 7.5mM. Also, this strain exhibited the unique characteristic of producing both polyhydroxybutyrate and polyphosphate concurrently as result of nutritional stress through either phosphorus or nitrogen limitation. Haloquadratum walsbyi was confirmed to be the only known archaeon to possess a phosphonate degradation pathway, and experiments confirmed the capability of this strain to consume phosphonates 2AEP, MPn and glyphosate as phosphorus sources.
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Long, Richard A. "Bacteria-bacteria antagonism on marine organic particles and its biogeochemical implications /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035420.

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Longford, Sharon Rae Faculty of Science UNSW. "The ecology of epiphytic bacteria on the marine red alga Delisea pulchra". Awarded by:University of New South Wales, 2007. http://handle.unsw.edu.au/1959.4/36783.

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Bacteria are ubiquitous to marine living surfaces, taking on a broad spectrum of roles from mutualistic to pathogenic. Despite their universality, much remains unknown about their basic ecology and interactions with higher organisms. To address this gap, this thesis firstly examines the bacterial communities associated with three co-occurring marine eukaryote hosts from temperate Australia: the demosponge Cymbastela concentrica, the subtidal red macroalga Delisea pulchra and the intertidal green macroalga Ulva australis. Molecular characterisation of the bacterial communities was undertaken using 16S rRNA gene library analysis to compare within-host (alpha) and between-host (beta) diversity for the three microbial communities. This study highlights the potentially substantial contribution host-associated microorganisms could have on marine microbial diversity. The remaining focus for this thesis was on the bacterial community associated with D. pulchra. This alga produces a suite of biologically active secondary metabolites (furanones) that non-toxically inhibit acyl homoserine lactone (AHL)-driven quorum sensing in bacteria, affecting a range of phenotypes including colonisation and virulence traits. The ecology of D. pulchra???s epiphytic bacteria was investigated using a mechanistic approach to explain bacterial colonisation patterns. In particular, concepts and models of ecological succession founded in eukaryote ecology were investigated. The thesis concludes with a study investigating the effect of furanones and elevated temperature on bacteria-induced disease and thallus bleaching of D. pulchra. In the presence of furanones colonisation and infection of two Roseobacter isolates from D. pulchra???s epiphytic bacterial community were inhibited. Ruegeria strain R11 was demonstrated to have temperature regulated virulence, which caused thallus bleaching in furanone-free algae. The implications of elevated sea temperatures resulting from global warming for algal health are discussed.
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Stetter, Dennis. "Regulation of Beta-Glucosidase in Marine Bacteria". NSUWorks, 1996. http://nsuworks.nova.edu/occ_stuetd/46.

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The following is a study of the regulation of production of a catabolic enzyme, beta-glucosidase, by isolated strains of marine bacteria. Catabolic enzymes transform organic matter to monosaccharides which are utilized as an energy source for growth by bacteria. The bacterial strains were isolated from the Gulf Stream off the coast of Florida, as well as from particulate matter collected from waters adjacent to the Florida coast. The first section describes the preparation of a liquid medium using sterile saltwater supplemented with inorganic nutrients and a carbohydrate component. This medium allowed growth of marine bacteria under carbohydrate-limiting conditions. A solid agar version of the media was also prepared, which allowed isolation of individual colonies of marine bacteria under carbohydrate-limiting conditions. The second section describes analyses of the regulation of beta-glucosidase production by five isolated bacterial strains using methylumbelliferyl-glucopyranoside (MUF-glu) as a model substrate. The beta-glucosidase hydrolysis of MUF-glu to glucose and a highly fluorescing product, methylumbelliferon (MUF ), allowed a measurement of enzyme activity in laboratory cultures. The experiments showed that four of the five bacterial strains isolated could regulate production of beta-glucosidase. When cellobiose, in particular, was the only carbohydrate present, the four strains showing regulatory ability produced elevated levels of enzyme activity. This elevated enzyme activity was not observed when glucose was provided as the only carbohydrate source. The fifth strain showed only low-level enzyme activity in the presence of cellobiose or glucose. This is the first evidence of the regulation of beta-glucosidase activity in particular strains of marine bacteria. Authenticity of beta-glucosidase activity was confirmed with known inhibitors of beta-glucosidase, gluconic acid, and glucose. The enzyme activities of all the isolated strains, measured by hydrolysis of MUF-glu to fluorescent MUF, showed sensitivity to both enzyme inhibitors. The sensitivity was observed as lower MUF production compared to control assay samples with no inhibitor added. The first isolated bacterial strain, from Gulf Stream waters, also showed an ability to repress the production of beta-glucosidase in the presence of glucose. This strain was tested with cylic AMP, known to neutralize glucose repression of beta-galactosidase in E.coli. Cyclic AMP, however, did not neutralize the effect· of glucose on repressing beta-glucosidase activity in the isolated marine bacterium.
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10

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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Libri sul tema "Marine bacteria"

1

Klepac-Ceraj, Vanja. Diversity and phylogenetic structure of two complex marine microbial communities. Ft. Belvoir: Defense Technical Information Center, 2004.

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2

Loïc, Charpy, Larkum A. W. D e Musée océanographique de Monaco, a cura di. Marine cyanobacteria. Monaco: Musée océanographique, 1999.

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3

Edlund, Anna. Microbial diversity in Baltic Sea sediments. Uppsala: Swedish University of Agricultural Sciences, 2007.

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4

Schut, F. Ecophysiology of a marine ultramicrobacterium. Groningen: [Microscreen], 1994.

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Arnosti, Carol. Structural characterization and bacterial degradation of marine carbohydrates. [Woods Hole, Mass: Woods Hole Oceanographic Institution, 1993.

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6

Gin, Karina Y. H. Microbial size spectra from diverse marine ecosystems. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1996.

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7

Martinussen, Ingrid. Roles of heterotrophic bacteria in the cycling of carbon, nitrogen and phosphorus in the marine pelagic environment. [Bergen, Norway]: Dept. of Microbiology and Plant Physiology, University of Bergen, 1991.

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Coble, Paula G. Marine bacteria as a source of dissolved fluorescence in the ocean. Woods Hole, Mass: Massachusetts Institute of Technology, 1989.

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Zhongguo hai yang wei sheng wu jun zhong mu lu: Catalogue of China marine microbial collections. Beijing Shi: Hua xue gong ye chu ban she, 2010.

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Cheung, Chin Wa Sunny. Biofilms of marine sulphate-reducing bacteria on mild steel. Portsmouth: University of Portsmouth, Division of Chemistry, 1995.

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Più fonti

Capitoli di libri sul tema "Marine bacteria"

1

Pietra, Francesco. "Marine bacteria". In A Secret World, 65–78. Basel: Birkhäuser Basel, 1990. http://dx.doi.org/10.1007/978-3-0348-7531-8_4.

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Blandón, L., A. Zuleta-Correa, M. Quintero, E. L. Otero-Tejada e J. Gómez-León. "Marine Bacteria Surfactants". In Marine Surfactants, 87–124. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003307464-3.

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Jørgensen, Bo Barker. "Bacteria and Marine Biogeochemistry". In Marine Geochemistry, 173–207. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04242-7_5.

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Stincone, Paolo, Robson Andreazza, Carolina Faccio Demarco, Thays França Afonso e Adriano Brandelli. "Marine Bacteria for Bioremediation". In Environmental Challenges and Solutions, 147–88. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-17226-7_8.

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Singh, Poonam, Kaleemunnisa FNU e Telma Encarnação. "Marine Bacteria for Biofertilizers". In Environmental Challenges and Solutions, 189–203. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-17226-7_9.

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Iwabuchi, Noriyuki. "Selective Stimulation of Aromatic Compound Degradation by the Indigenous Marine Bacterium Cycloclasticus for Bioremediation of Oil Spills in the Marine Environment". In Biodegradative Bacteria, 313–33. Tokyo: Springer Japan, 2013. http://dx.doi.org/10.1007/978-4-431-54520-0_16.

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Smit, John, John F. Nomellini e Wade H. Bingle. "Electroporation of Plasmids into Freshwater and Marine Caulobacters". In Electrotransformation of Bacteria, 271–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04305-9_33.

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Shukla, Prashakha J., Shivang B. Vhora, Ankita G. Murnal, Unnati B. Yagnik e Maheshwari Patadiya. "Exopolysaccharide Production from Marine Bacteria and Its Applications". In Marine Biochemistry, 337–68. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003303909-18.

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Murphy, Brian T., Paul R. Jensen e William Fenical. "The Chemistry of Marine Bacteria". In Handbook of Marine Natural Products, 153–90. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-3834-0_3.

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Millington, J. Thomas. "Marine Bacteria of Rocas Alijos". In Rocas Alijos, 171–76. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-017-2917-8_13.

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Atti di convegni sul tema "Marine bacteria"

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Stramski, Dariusz, e Dale A. Kiefer. "Optical properties of marine bacteria". In Orlando '90, 16-20 April, a cura di Richard W. Spinrad. SPIE, 1990. http://dx.doi.org/10.1117/12.21450.

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2

Farooq, Adeel, e Asma Rafique. "Unveiling Mobilizable Multiresistance Clusters in Marine Bacteria". In The 4th International Electronic Conference on Applied Sciences. Basel Switzerland: MDPI, 2023. http://dx.doi.org/10.3390/asec2023-16306.

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3

Abdoli, Leila, Yi Liu, Xiaoyan He e Hua Li. "Bacillus sp.–Triggered Biocorrosion of Arc Sprayed Aluminum Coatings in Artificial Seawater". In ITSC2018, a cura di F. Azarmi, K. Balani, H. Li, T. Eden, K. Shinoda, T. Hussain, F. L. Toma, Y. C. Lau e J. Veilleux. ASM International, 2018. http://dx.doi.org/10.31399/asm.cp.itsc2018p0716.

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Abstract Thermal sprayed marine coatings in the marine environment usually encounter chloride-induced corrosion and microbiologically induced corrosion. Formation of microbial biofilm is crucial for subsequent attachment of large fouler and understanding the initiation and growth of the biofilm is essential for possibly controlling the occurring of biofouling. This paper reports the formation of Bacillus sp. bacterial biofilm on arc sprayed aluminum coatings and its effect on the corrosion behaviors of the coatings. Results show fast and pronounced attachment and colonization of the bacteria on aluminum coatings. The bacterial biofilm was systematically examined by CLSM, FESEM, and Raman spectroscopy. Electrochemical assessment revealed that the aluminum coating immersed in the bacteria-containing media showed higher corrosion resistance than the sterile samples. A model was proposed to explain how the microorganisms and their metabolic by-products protect the coatings against penetration of corrosive media. The results would give insight into design and fabrication of thermal sprayed coatings for enhanced anti-biocorrosion performances in the marine environment.
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Pope, Emily, Tarteela Alkayyali, Sydney Wheatley, Christopher Cartmell, Jultwahnique McDonald, Bradley Haltli, Ali Ahmadi e Russell Kerr. "Optimization of Marine Bacteria Microencapsulation for the Discovery of Novel Marine Natural Products". In Canadian Society for Mechanical Engineering International Congress (2020 : Charlottetown, PE). Charlottetown, P.E.I.: University of Prince Edward Island. Robertson Library, 2020. http://dx.doi.org/10.32393/csme.2020.1264.

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Grigson, S., C. Cheong e E. Way. "Studies of produced water toxicity using luminescent marine bacteria". In ENVIRONMENTAL TOXICOLOGY 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/etox060111.

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Mazalan, Norfaezah, Mazatulikhma Mat Zain e Ahmad Sazali Hamzah. "Antimicrobial activity of marine bacteria from Malaysian coastal area". In 2012 IEEE Symposium on Humanities, Science and Engineering Research (SHUSER). IEEE, 2012. http://dx.doi.org/10.1109/shuser.2012.6268808.

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Stramski, Dariusz, Marian Sedlak, David Tsai, Eric J. Amis e Dale A. Kiefer. "Dynamic light scattering by cultures of heterotrophic marine bacteria". In San Diego '92, a cura di Gary D. Gilbert. SPIE, 1992. http://dx.doi.org/10.1117/12.140688.

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"Isolation and identification of antimicrobial agents from marine bacteria". In Microscience Microscopy Congress 2023 incorporating EMAG 2023. Royal Microscopical Society, 2023. http://dx.doi.org/10.22443/rms.mmc2023.485.

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Kolesnik, O. V., T. V. Rozhko, A. S. Sachkova e N. S. Kudryasheva. "STUDYING THE EFFECT OF TH-232 ON BIOLUMINESCENT CELLULAR SYSTEMS. THE ROLE OF REACTIVE OXYGEN SPECIES". In X Международная конференция молодых ученых: биоинформатиков, биотехнологов, биофизиков, вирусологов и молекулярных биологов — 2023. Novosibirsk State University, 2023. http://dx.doi.org/10.25205/978-5-4437-1526-1-183.

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Abstract (sommario):
Despite the prevalence of thorium in the ecosystem its effect on living organisms has not been studied. Marine luminescent bacteria is an optimal bioassay for studying the effects of low-dose thorium exposure. We observed activation of bioluminescence under low-dose exposures (< 0.01 Gy) and decay of the content of reactive oxygen species in the bacterial suspensions.
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Elling, F. J., T. W. Evans, J. D. Hemingway, J. J. Kharbush, V. Nathan, B. Bayer, A. E. Santoro, E. Spieck, R. E. Summons e A. Pearson. "Marine and Terrestrial Nitrifying Bacteria are Sources of Diverse Bacteriohopanepolyols". In 30th International Meeting on Organic Geochemistry (IMOG 2021). European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202134112.

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Rapporti di organizzazioni sul tema "Marine bacteria"

1

Lidstrom, Mary E. Genetics in Marine Methane-Oxidizing Bacteria. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1989. http://dx.doi.org/10.21236/ada203790.

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CALIFORNIA UNIV BERKELEY. Genetics in Marine Methane-Oxidizing Bacteria. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1990. http://dx.doi.org/10.21236/ada218398.

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Sislak, Christine. Novel Thermophilic Bacteria Isolated from Marine Hydrothermal Vents. Portland State University Library, gennaio 2000. http://dx.doi.org/10.15760/etd.1485.

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Colwell, Rita R. Ecology and Molecular Genetic Studies of Marine Bacteria. Fort Belvoir, VA: Defense Technical Information Center, giugno 1989. http://dx.doi.org/10.21236/ada215446.

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Felbeck, Horst. Biology of Symbioses between Marine Invertebrates and Intracellular Bacteria. Fort Belvoir, VA: Defense Technical Information Center, gennaio 1991. http://dx.doi.org/10.21236/ada231328.

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Eisen, Jonathan. Shotgun Sequencing of Plasmids from Marine Sediment Bacteria - Genetic Exploration. Fort Belvoir, VA: Defense Technical Information Center, settembre 2001. http://dx.doi.org/10.21236/ada398735.

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Stephanie Norman, Stephanie Norman. Do Pacific Northwest marine mammals carry antibiotic-resistant bacteria from land animals? Experiment, luglio 2018. http://dx.doi.org/10.18258/11694.

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Krumholz, Lee R., Jimmy D. Ballard e Joseph M. Suflita. In-Situ Survival Mechanisms of Sulfate-Reducing Bacteria in Polluted Marine Sediments. Fort Belvoir, VA: Defense Technical Information Center, marzo 2004. http://dx.doi.org/10.21236/ada421513.

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Emerson, David. Role of Fe-Oxidizing Bacteria in Metal Bio-Corrosion in the Marine Environment. Fort Belvoir, VA: Defense Technical Information Center, giugno 2015. http://dx.doi.org/10.21236/ada621580.

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Frischer, Marc E., Peter G. Verity, Mathew R. Gilligan, Deborah A. Bronk, Jonathan P. Zehr e Melissa G. Booth. MOLECULAR APPROACHES FOR IN SITU IDENTIFCIATION OF NITRATE UTILIZATION BY MARINE BACTERIA AND PHYTOPLANKTON. Office of Scientific and Technical Information (OSTI), settembre 2013. http://dx.doi.org/10.2172/1092730.

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