Relevant bibliographies by topics / Fungal-bacterial interactions

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Fungal-bacterial interactions'

Author: Grafiati
Published: 4 June 2021
Last updated: 27 April 2022

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Journal articles on the topic "Fungal-bacterial interactions"

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Peleg, Anton Y., Deborah A. Hogan, and Eleftherios Mylonakis. "Medically important bacterial–fungal interactions." Nature Reviews Microbiology 8, no. 5 (March 29, 2010): 340–49. http://dx.doi.org/10.1038/nrmicro2313.

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Nogueira, Filomena, Shirin Sharghi, Karl Kuchler, and Thomas Lion. "Pathogenetic Impact of Bacterial–Fungal Interactions." Microorganisms 7, no. 10 (October 16, 2019): 459. http://dx.doi.org/10.3390/microorganisms7100459.

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Polymicrobial infections are of paramount importance because of the potential severity of clinical manifestations, often associated with increased resistance to antimicrobial treatment. The intricate interplay with the host and the immune system, and the impact on microbiome imbalance, are of importance in this context. The equilibrium of microbiota in the human host is critical for preventing potential dysbiosis and the ensuing development of disease. Bacteria and fungi can communicate via signaling molecules, and produce metabolites and toxins capable of modulating the immune response or altering the efficacy of treatment. Most of the bacterial–fungal interactions described to date focus on the human fungal pathogen Candida albicans and different bacteria. In this review, we discuss more than twenty different bacterial–fungal interactions involving several clinically important human pathogens. The interactions, which can be synergistic or antagonistic, both in vitro and in vivo, are addressed with a focus on the quorum-sensing molecules produced, the response of the immune system, and the impact on clinical outcome.
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Khalid, Saima, and Nancy P. Keller. "Chemical signals driving bacterial–fungal interactions." Environmental Microbiology 23, no. 3 (February 8, 2021): 1334–47. http://dx.doi.org/10.1111/1462-2920.15410.

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Scherlach, Kirstin, and Christian Hertweck. "Chemical Mediators at the Bacterial-Fungal Interface." Annual Review of Microbiology 74, no. 1 (September 8, 2020): 267–90. http://dx.doi.org/10.1146/annurev-micro-012420-081224.

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Interactions among microbes are key drivers of evolutionary progress and constantly shape ecological niches. Microorganisms rely on chemical communication to interact with each other and surrounding organisms. They synthesize natural products as signaling molecules, antibiotics, or modulators of cellular processes that may be applied in agriculture and medicine. Whereas major insight has been gained into the principles of intraspecies interaction, much less is known about the molecular basis of interspecies interplay. In this review, we summarize recent progress in the understanding of chemically mediated bacterial-fungal interrelations. We discuss pairwise interactions among defined species and systems involving additional organisms as well as complex interactions among microbial communities encountered in the soil or defined as microbiota of higher organisms. Finally, we give examples of how the growing understanding of microbial interactions has contributed to drug discovery and hypothesize what may be future directions in studying and engineering microbiota for agricultural or medicinal purposes.
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Krüger, Wibke, Sarah Vielreicher, Mario Kapitan, Ilse Jacobsen, and Maria Niemiec. "Fungal-Bacterial Interactions in Health and Disease." Pathogens 8, no. 2 (May 21, 2019): 70. http://dx.doi.org/10.3390/pathogens8020070.

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Fungi and bacteria encounter each other in various niches of the human body. There, they interact directly with one another or indirectly via the host response. In both cases, interactions can affect host health and disease. In the present review, we summarized current knowledge on fungal-bacterial interactions during their commensal and pathogenic lifestyle. We focus on distinct mucosal niches: the oral cavity, lung, gut, and vagina. In addition, we describe interactions during bloodstream and wound infections and the possible consequences for the human host.
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Deveau, Aurélie, Gregory Bonito, Jessie Uehling, Mathieu Paoletti, Matthias Becker, Saskia Bindschedler, Stéphane Hacquard, et al. "Bacterial–fungal interactions: ecology, mechanisms and challenges." FEMS Microbiology Reviews 42, no. 3 (February 19, 2018): 335–52. http://dx.doi.org/10.1093/femsre/fuy008.

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Kobayashi, Donald Y., and Jo Anne Crouch. "Bacterial/Fungal Interactions: From Pathogens to Mutualistic Endosymbionts." Annual Review of Phytopathology 47, no. 1 (September 2009): 63–82. http://dx.doi.org/10.1146/annurev-phyto-080508-081729.

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Abdulkareem, Asan F., Hiu Ham Lee, Mohammed Ahmadi, and Luis R. Martinez. "Fungal serotype-specific differences in bacterial-yeast interactions." Virulence 6, no. 6 (July 2015): 652–57. http://dx.doi.org/10.1080/21505594.2015.1066962.

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Arvanitis, Marios, and Eleftherios Mylonakis. "Fungal-bacterial interactions and their relevance in health." Cellular Microbiology 17, no. 10 (August 20, 2015): 1442–46. http://dx.doi.org/10.1111/cmi.12493.

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Sengeløv, G. "Influence of fungal-bacterial interactions on bacterial conjugation in the residuesphere." FEMS Microbiology Ecology 31, no. 1 (January 2000): 39–45. http://dx.doi.org/10.1016/s0168-6496(99)00079-3.

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Dissertations / Theses on the topic "Fungal-bacterial interactions"

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El-Shetehy, Mohamed H. "Molecular and Biochemical Signaling Underlying Arabidopsis-Bacterial/Virus/Fungal Interactions." UKnowledge, 2016. http://uknowledge.uky.edu/plantpath_etds/19.

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Systemic acquired resistance (SAR) is a form of inducible defense response triggered upon localized infection that confers broad-spectrum disease resistance against secondary infections. Several factors are known to regulate SAR and these include phenolic phytohormone salicylic acid (SA), phosphorylated sugar glycerol-3-phosphate (G3P), and dicarboxylic acid azelaic acid (AzA). This study evaluated a role for free radicals nitric oxide (NO) and reactive oxygen species (ROS) in SAR. Normal accumulation of both NO and ROS was required for normal SAR and mutations preventing NO/ROS accumulation and/or biosynthesis compromised SAR. A role for NO and ROS was further established using pharmacological approaches. Notably, both NO and ROS conferred SAR in a concentration dependent manner. This was further established using genetic mutants that accumulated high levels of NO. NO/ROS acted upstream of G3P and in parallel to SA. Collectively, these results suggest that NO and ROS are essential components of the SAR pathway.
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Artursson, Veronica. "Bacterial-fungal interactions highlighted using microbiomics : potential application for plant growth enhancement /." Uppsala : Dept. of Microbiology, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/2005127.pdf.

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Foster, Dylan, Gethien Andrew, and Sean Fox. "Developing a C. elegans Co-infection Model for Assessing Bacterial-Fungal Interactions." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/128.

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The Candida genus is full of fungi that are subtle parts of the human microbiome, but they can cause complications if they overgrow within the body—specifically the mouth and throat, the genitalia, and the entire body through infection of the bloodstream. Candida species are a rising problem for many across the world, and this can be seen in the recent threat of Candida auris hospitalizing patients and being regularly resistant to anti-fungal medications. Beyond C. auris, Candida albicans is the most common Candida species that humans must combat because it causes the most infections in humans—mostly vaginal yeast infections. C. albicans does have natural competitors that can either inhibit its growth or kill it in general, and the competition that we took advantage of was with the Alcaligenes species. Alcaligenes faecalis and Alcaligenes viscolactis have been shown to at least inhibit C. albicans growth and maybe even kill the fungus. This rate of infection from C. albicans places it at the forefront of Candida research, and we attempted to further this research by utilizing both A. faecalis and A. viscolactis to create a co-infection model for Caenorhabditis elegans—a simple nematode lifeform. It is known that A. faecalis and A. viscolactis do not commonly adversely affect humans, so little research has been done concerning their clinical effects. We were looking to find a possible answer to C. albicans infections beyond antifungal drugs because we know that antibiotic resistance is on the rise. We performed liquid assays to test the survivability of C. elegans nematodes in various bacterial/fungal circumstances. We subjected batches of C. elegans to E. coli OP50 as a control, A. faecalis, A. viscolactis, C. albicans, A. faecalis and C. albicans, and A. viscolactis and C. albicans. This procedure was followed in order to determine the viability of using the Alcaligenes species to either help the C. elegans survive the infection or prevent them from getting infected at all. After following through with the project, we found that there was a noticeable increase in the survivability of C. elegans when subjected to both one of the Alcaligenes species and C. albicans as opposed to the C. albicans alone. The data, although early, shows the possibility of Alcaligenes species being used to combat C. albicans infections in lifeforms.
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Dillard, Cory, Aleigha Spaulding, Christopher Prybilla, and Sean Fox. "Does Morphology Matter? The Fungal-Bacterial Inhibitory Interactions of Candida albicans and Alcaligenes faecalis." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/asrf/2018/schedule/143.

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Bacteria and fungi have acquired the ability to interact and survive in many hostile environments both found in nature, as well as, the human body. Candida albicans, an opportunistic fungal pathogen, causes a variety of infections in immunocompromised or immunosuppressed individuals, but also asymptomatically colonizes 80% of the population within the intestinal tract, oral cavity, as well as, the female genitourinary system. A unique capability of C. albicans is the ability to change its morphology from benign circular yeast form, to oval pseudohyphal form, to cylindrical tissue-penetrating hyphal form. Our laboratory has previously identified a bacterium, Alcaligenes faecalis, which displays inhibitory characteristics towards C. albicans. A review of the literature shows that some bacteria have the ability to inhibit C. albicans, but only when in the hyphal form. We therefore wanted to explore if the morphological state of C. albicans dictated the degree of inhibition A. faecalis is able to exude, or simply “does morphology matter?” To determine this effect, a series of both solid and liquid media experiments were performed using a wild-type (able to convert between morphologies) strain of C. albicans, a mutant strain of C. albicans locked into the yeast morphological state, and a mutant strain of C. ablicans locked into the hyphal morphological state. For solid media experiments, the different strains of C. albicans were made into a lawn on agar plates, A. faecalis was spotted onto the lawns, and, after 24 hours, observed for signs of inhibition. For liquid media experiments, C. albicans strains were inoculated alone or co-cultured with A. faecalis for 24 hours and plated to enumerate colony forming units. Our results indicate that: (1) the morphological state of C. albicans is not a determining factor, which is a unique finding compared to other published reports; (2) Both A. faecalis and the closely related A. viscolactis both inhibit C. albicans showing that this is a shared ability among the Alcaligenes genus. (3) that the ability to inhibit C. albicans is thru some form of contact dependent mechanism, as the cell free supernatant of A. faecalis has no inhibitory action. Currently, the exact mechanism for this interaction is unknown, but could be one of the secretion systems bacteria use for interactions with other microbes. As there are very limited treatments for fungal infections and severe side-effects associated with current antifungals, exploiting these mechanisms are medically relevant to human health as they could potentially lead to novel treatments for problematic human fungal pathogens.
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Hervé, Vincent. "Bacterial-fungal interactions in wood decay : from wood physicochemical properties to taxonomic and functional diversity of Phanerochaete chrysosporium-associated bacterial communities." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0041/document.

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Dans les écosystèmes forestiers, la décomposition du bois est un processus majeur, notamment impliqué dans le cycle du carbone et des nutriments. Les champignons basidiomycètes saprotrophes, incluant les pourritures blanches, sont les principaux agents de cette décomposition dans les forêts tempérées. Bien que peu étudiées, des communautés bactériennes sont également présentes dans le bois en décomposition et cohabitent avec ces communautés fongiques. L'impact des interactions bactéries-champignons sur le fonctionnement d'une niche écologique a été décrit dans de nombreux environnements. Cependant, leur rôle dans le processus de décomposition du bois n'a été que très peu investigué. A partir d'expériences en microcosme et en utilisant une approche non cultivable, il a été démontré que la présence du champignon Phanerochaete chrysosporium influençait significativement la structure et la diversité des communautés bactériennes associées au processus de décomposition du hêtre (Fagus sylvatica). Par une approche cultivable, cet effet mycosphère a été confirmé, se traduisant par une augmentation de la densité des communautés bactériennes en présence du champignon ainsi que par une modification de la diversité fonctionnelle de ces communautés. Enfin, une approche polyphasique a été développée, combinant l'analyse des propriétés physico-chimiques du bois et des activités enzymatiques extracellulaires. Les résultats de cette expérience ont révélé que l'association de P. chrysosporium avec une communauté bactérienne issue de la mycosphère de ce dernier aboutissait à une dégradation plus importante du matériau bois par rapport à la dégradation par le champignon seul, démontrant pour la première fois des interactions bactéries-champignons synergiques dans le bois en décomposition
Wood decomposition is an important process in forest ecosystems in terms of their carbon and nutrient cycles. In temperate forests, saprotrophic basidiomycetes such as white-rot fungi are the main wood decomposers. While they have been less studied, bacterial communities also colonise decaying wood and coexist with these fungal communities. Although the impact of bacterial-fungal interactions on niche functioning has been highlighted in a wide range of environments, little is known about their role in wood decay. Based on microcosm experiments and using a culture-independent approach, we showed that the presence of the white-rot fungus Phanerochaete chrysosporium significantly modified the structure and diversity of the bacterial communities associated with the degradation of beech wood (Fagus sylvatica). Using a culture-dependent approach, it was confirmed that in the presence of the fungus the mycosphere effect resulted in increased bacterial abundance and modified the functional diversity of the fungal-associated bacterial communities. Lastly, a polyphasic approach simultaneously analysing wood physicochemical properties and extracellular enzyme activities was developed. This approach revealed that P. chrysosporium associated with a bacterial community isolated from its mycosphere was more efficient in degrading wood compared to the fungus on its own, highlighting for the first time synergistic bacterial-fungal interactions in decaying wood
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Tourneroche, Anne. "Bacterial-fungal interactions within the endomicrobiota of brown algae : implication of quorum sensing in the metabolic crosstalk." Thesis, Paris, Muséum national d'histoire naturelle, 2018. http://www.theses.fr/2018MNHN0013.

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Les macroalgues hébergent de nombreux micro-organismes, collectivement désignés sous le terme de microbiote algal, qui ont un rôle essentiel dans le développement et l’état de santé de leur hôte. Dans ce travail, nous avons exploré le microbiote fongique et bactérien d’algues brunes, ainsi que l’impact des interactions bactérie-champignon sur la médiation chimique et, en particulier, sur le quorum sensing bactérien. Par des approches de metabarcoding ciblant l’ADNr 16S et l’ITS2, nous avons montré que les communautés fongiques et bactériennes associées à la macroalgue brune Saccharina latissima étaient très riches, principalement composées de quelques OTUs dominants, et d’une grande abondance d’OTUs « rares ». De manière intéressante, les communautés fongiques comme bactériennes différaient de celles de l’eau de mer environnante et paraissaient spécifiques des tissus algaux. Cependant, de grandes variations intra et interindividuelles de composition ont été observées au sein des échantillons de tissus d’algue. Ainsi, ce qui définit la spécificité des communautés microbiennes reste à préciser. En parallèle, nous avons exploré la médiation chimique au sein de l’endomicrobiote de quatre algues brunes : Saccharina latissima, Laminaria digitata, Pelvetia canaliculata et Ascophylum nodosum, et révélé que de nombreux endophytes fongiques et bactériens isolés synthétisaient des métabolites interférant avec les systèmes de quorum sensing bactériens, en les induisant ou les inhibant. De plus, les bioessais basés sur les biosenseurs, couplés à une approche métabolomique, effectués sur les co-cultures, ont mis en évidence en quoi les interactions bactéries-champignons au sein de l’endomicrobiote d’algues brunes pouvaient affecter la production de médiateurs chimiques, et notamment de molécules interférant avec le quorum sensing bactérien. Ensemble, ces résultats suggèrent que le quorum sensing pourrait jouer un rôle clé dans le réseau complexe d’interactions au sein du microbiote algal, et ainsi dans l’équilibre hôte-microbiote
Macroalgae host various microorganisms, collectively referred as the algal microbiota, which play an essential role in the development and health status of their host. In this work, we explored the bacterial and fungal microbiota of brown algae, as well as the impact of bacterial fungal interactions on the chemical mediation and, in particular, on the bacterial quorum sensing. Using 16S rDNA-based and ITS2-based metabarcoding approaches we showed that the fungal and bacterial communities associated with the brown macroalgae Saccharina latissima were very rich, mainly composed of few dominant OTUs, and a large abundance of “rare” OTUs. Interestingly, both fungal and bacterial communities differed from the ones of the surrounding seawater and appeared specific to the algal tissues. However, high intra and interindividual variations of composition were observed among the algal tissue samples. Thus what define the specificity of the microbial communities remains to be clarified. In parallel, we explored the chemical mediation within the cultivable endomicrobiota of four brown algae: Saccharina latissima, Laminaria digitata, Pelvetia canaliculata and Ascophylum nodosum, and pointed out that many of the isolated bacterial and fungal endophytes could synthetize metabolites interfering with bacterial quorum sensing systems, either inducing or inhibiting them. Additionally, biosensor-based bioassays coupled with metabolomics approaches performed on co-culture experiments, highlighted how bacterial-fungal interactions within the endomicrobiota of brown algae could affect the production of chemical mediators, including those interfering with bacterial quorum sensing. Altogether, the results suggest that the quorum sensing could play a key role in the complex network of interactions within the algal microbiota, and thus in the host-microbiota equilibrium
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Imtiaz, Nashmya. "The effect and interactions of the minor groove binders AIK 19/56/2 and AIK 20/25/1 on bacterial, fungal and mammalian cells." Thesis, University of Strathclyde, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.502307.

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Minor Groove Binders are a group of compound that bind to the minor grooves of DNA. Some of these compounds are able to bind to specific sequences on DNA, causing toxicity to cells, and this has generated an interest in their use as antimicrobial or anticancer agents. They are generally characterised by their recognisable crescent shape. The focus of this research is the effect of two minor groove binders AIK 19/56/2 and AIK 20/25/1 on the survival of various bacterial cell types as well as mammalian and fungal cells. This has been examined using growth curves, killing curves, fluorescent microscopy, HPLC spectra and topoisomerase I inhibition have been used. These experiments have given an insight into the mechanism of action of these compounds.
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Das, Mitali. "Microbial Community Structure and Interactions in Leaf Litter in a Stream." Kent State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=kent1144953748.

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Haack, Frederike Svenja [Verfasser], and Wolfgang [Akademischer Betreuer] Streit. "Genome, mutational and RNA-seq analyses of Janthinobacterium and Duganella strains reveal the presence of a single α-hydroxyketone-like quorum sensing system involved in bacterial-fungal interactions / Frederike Svenja Haack ; Betreuer: Wolfgang Streit." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1124155376/34.

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Haack, Frederike Svenja [Verfasser], and Wolfgang [Akademischer Betreuer] Streit. "Genome, mutational and RNA-seq analyses of Janthinobacterium and Duganella strains reveal the presence of a single α-hydroxyketone-like quorum sensing system involved in bacterial-fungal interactions / Frederike Svenja Haack ; Betreuer: Wolfgang Streit." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/1120015073/34.

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Books on the topic "Fungal-bacterial interactions"

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Bacterial-fungal interactions highlighted using microbiomics: Potential application for plant growth enhancement. Uppsala: Swedish University of Agricultural Sciences, 2005.

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Maisetta, Giuseppantonio, and Giovanna Batoni, eds. Interspecies Interactions: Effects On Virulence And Antimicrobial Susceptibility Of Bacterial And Fungal Pathogens. Frontiers Media SA, 2020. http://dx.doi.org/10.3389/978-2-88966-097-1.

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Thuny, Franck, and Didier Raoult. Pathophysiology and causes of endocarditis. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0160.

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Endocarditis is defined as an inflammation of the endocardial surface of the heart. This may include heart valves, mural endocardium or the endocardium that covers implanted material, such as prosthetic valves, pacemaker/defibrillator leads and catheters. Infective and non-infective-related causes must be distinguished. In most cases, the inflammation is related to a bacterial or fungal infection with oral streptococci, group D streptococci, staphylococci and enterococci accounting for 85% of episodes. Infective endocarditis (IE) is a serious disease with an incidence ranging from 30 to 100 episodes/million patient-years. From various portals of entry (e.g. oral, digestive, cutaneous) and a subsequent bacteraemia, pathogens can adhere and colonize intracardiac foreign material or onto previously damaged endocardium due to numerous complex processes based on a unique host–pathogen interaction. Rarely, endocarditis can be related to non-infective causes, such as immunological or neoplastic. Mortality is high, with more than one-third dying within a year of diagnosis from complications such as acute heart failure or emboli. This disease still remains a diagnostic challenge with many cases being identified and subsequently treated too late. Diagnosis of IE usually relies on the association between an infectious syndrome and recent endocardial involvement. Blood cultures and echocardiography are the main diagnostic procedures, but are negative in almost 30% of cases, requiring the use of more sophisticated techniques. Computed tomography, magnetic resonance imaging and positron emission tomography are promising imaging modalities. Improved understanding of its pathophysiology and the development of relevant diagnostic strategies enables accelerated identification and treatment, and thus an improved prognosis.
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Book chapters on the topic "Fungal-bacterial interactions"

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Bennett, J. W., and T. Feibelman. "Fungal Bacterial Interactions." In Fungal Associations, 229–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-07334-6_13.

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Hogan, Deborah A., and Roberto Kolter. "Fungal-Bacterial Interactions." In Molecular Principles of Fungal Pathogenesis, 261–69. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555815776.ch19.

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Ermert, David, Arturo Zychlinsky, and Constantin Urban. "Fungal and Bacterial Killing by Neutrophils." In Host-Pathogen Interactions, 293–312. Totowa, NJ: Humana Press, 2009. http://dx.doi.org/10.1007/978-1-59745-204-5_21.

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Khan, M. Wajid, and K. N. Pathak. "Nematodes as vectors of bacterial and fungal plant pathogens." In Nematode Interactions, 251–72. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1488-2_12.

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Van Dijck, Patrick, and Mary Ann Jabra-Rizk. "Fungal–Bacterial Interactions: In Health and Disease." In Candida albicans: Cellular and Molecular Biology, 115–43. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50409-4_8.

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Tarkka, Mika, and Aurélie Deveau. "8 An Emerging Interdisciplinary Field: Fungal–Bacterial Interactions." In Environmental and Microbial Relationships, 161–78. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29532-9_8.

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Smith, David L., and Ramanan Laxminarayan. "Human Interventions on the Evolution of Host-Bacterium Interactions." In Evolutionary Biology of Bacterial and Fungal Pathogens, 51–62. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555815639.ch6.

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Margolis, Elisa, and Bruce R. Levin. "Evolution of Bacterial-Host Interactions: Virulence and the Immune Overresponse." In Evolutionary Biology of Bacterial and Fungal Pathogens, 1–12. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555815639.ch1.

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Olsson, Stefan, Paola Bonfante, and Teresa E. Pawlowska. "Chapter 39 Ecology and Evolution of Fungal-Bacterial Interactions." In Mycology, 563–84. CRC Press Taylor & Francis Group 6000 Broken Sound Parkway NW, Suite 300 Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315119496-40.

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Quintana-Murci, Lluís. "Human Genome Diversity: a Host Genomic Perspective of Host-Pathogen Interactions and Infectious Diseases." In Evolutionary Biology of Bacterial and Fungal Pathogens, 39–49. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555815639.ch5.

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Conference papers on the topic "Fungal-bacterial interactions"

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Šmit, Biljana, Asija Halilagić, Enisa Selimović, Jelena Katanić Stanković, Nikola Srećković, and Tanja Soldatović. "STUDIES OF SUBSTITUTION REACTIONS WITH IMPORTANT BIOMOLECULES AND ANTIMICROBIAL ACTIVITY OF NOVEL ZN(II)-L-CU(II) COMPLEXES." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.328s.

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New dinuclear Zn(II)-L-Cu(II) complexes with different bridging ligands were synthesized. Interactions of these complexes with biologically important nucleophiles, 5′-GMP, 5′-IMP and GSH, were investigated by Uv-Vis spectrofotometric method. The distances between the metal ions lead to less reactivity of both centers due to reduced electronic communication between them and an increasing of electron density on the metal centers itself. Both complexes showed moderate antimicrobial activity against most of the tested bacterial and fungal strains.
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Reports on the topic "Fungal-bacterial interactions"

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House, Geoffrey Lehman. Understanding the diversity of bacterial and fungal interactions. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1441272.

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Steffens, John, Eithan Harel, and Alfred Mayer. Coding, Expression, Targeting, Import and Processing of Distinct Polyphenoloxidases in Tissues of Higher Plants. United States Department of Agriculture, November 1994. http://dx.doi.org/10.32747/1994.7613008.bard.

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Polyphenol oxidase (PPO) catalyzes the oxidation of phenols to quinones at the expense of O2. PPOs are ubiquitous in higer plants, and their role in oxidative browning of plant tissues causes large annual losses to food production. Despite the importance of PPOs to agriculture, the function(s) of PPOs in higher plants are not understood. Among other roles, PPOs have been proposed to participate in aspects of chloroplast metabolism, based on their occurrence in plastids and high Km for O2. Due to the ability of PPO to catalyze formation of highly reactive quinones, PPOs have also been proposed to be involved in a wide array of defensive interactions with insect, bacterial, and fungal pests. Physiological and biochemical studies of PPO have provided few answers to the major problems of PPO function, subcellular localization, and biochemical properties. This proposal achieved the following major objectives: cloning of PPO cDNAs in potato and tomato; characterization of the tomato PPO gene family; antisense downregulation of the tomato PPO gene family; and reduction in post-harvest enzymic browning of potato through expression of antisense PPO genes under the control of tuber-specific promoters. In addition, we established the lumenal localization of PPO, characterized and clarified the means by which PPOs are imported and processed by chloroplasts, and provided insight into the factors which control localization of PPOs. This proposal has thereby provided fundamental advances in the understanding of this enzyme and the control of its expression.
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3

Phillips, Donald A., Yitzhak Spiegel, and Howard Ferris. Optimizing nematode management by defining natural chemical bases of behavior. United States Department of Agriculture, November 2006. http://dx.doi.org/10.32747/2006.7587234.bard.

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This project was based on the hypothesis that nematodes interacting with plants as either parasites or beneficial saprophytes are attracted to their host by natural products. This concept was supported by numerous observations that parasitic nematodes are attracted to root exudates. Our overall goal was to identify nematode sensory compounds from root exudates and to use that information for reducing nematicide applications. We applied skills of the investigators to achieve three specific objectives: 1) Identify nematode behavioral cues (e.g., attractants or repellents) in root exudates; 2) Identify new natural nematicidal compounds; and 3) Combine a natural attractant and a nematicide into a nematode trap. Because saprophytic nematodes benefit plants by mineralizing organic matter, we sought compounds attractive primarily to parasitic nematodes. The project was constructed on several complementary foundations. First, data from Dr. Spiegel’s lab showed that under aseptic conditions Ditylenchus dipsaci, a parasite on onion, is attracted to certain fractions of onion root exudates. Second, PI Phillips had a sizeable collection of natural plant products he had identified from previous work on Rhizobium-legume interactions, which could be tested “off the shelf”. Third, Dr. Ferris had access to aseptic and natural populations of various saprophytic and parasitic nematodes. The project focused on five nematode species: D.dipsaci, Heterodera avenae, and Tylenchulussemipenetransat ARO, and Meloidogyne javanicand Caenorhabditis elegans at UCD. Ten pure plant compounds, mostly flavonoids, were tested on the various nematode species using six different assay systems. Results obtained with assorted test systems and by various scientists in the same test systems were essentially irreproducible. Many convincing, Many convincing, i.e. statistically significant, results in one system or with one investigator could not be repeated with other assays or different people. A recent report from others found that these compounds, plus another 30, were inactive as attractants in three additional parasitic nematode species (Wuyts et al. Nematology 8:89- 101, 2006). Assays designed to test the hypothesis that several compounds together are required to attract nematodes have thus far failed to find a reproducibly active combination. In contrast to results using pure plant compounds, complex unfractionated exudates from aseptic onion root reproducibly attracted D. dipsaci in both the ARO and UCD labs. Onion root exudate collection, separation into HPLC fractions, assays using D. dipsaci and MS-MS experiments proceeded collaboratively between ARO and UCD without any definitive identification of an active compound. The final active fraction contained two major molecules and traces of several other compounds. In the end, analytical studies were limited by the amount of onion root exudate and the complexity of the purification process. These tests showed that aseptic plant roots release attractant molecules, but whether nematodes influence that release, as insects trigger release of attractants from plants, is unknown. Related experiments showed that the saprophyte C. elegans stimulates its prey, Pseudomonas bacteria, to increase production of 2, 4-diacetylphloroglucinol (DAPG) a compound that promotes amino acid exudation by plant roots. It is thus possible that saprophytic nematodes are attracted primarily to their bacterial or fungal prey and secondarily to effects of those microorganisms on root exudation. These observations offer promising avenues for understanding root-zone interactions, but no direct routes to controlling nematodes in agriculture were evident. Extracts from two plant sources, Chrysanthemum coronarium and Sequoia sempervirens, showed nematicidal activity at ARO and UCD, respectively. Attempts to purify an active compound from S. sempervirens failed, but preliminary results from C. coronarium are judged to form a potential basis for further work at ARO. These results highlight the problems of studying complex movement patterns in sentient organisms like nematodes and the issues associated with natural product isolation from complex mixtures. Those two difficulties combined with complications now associated with obtaining US visas, slowed and ultimately limited progress on this project. As a result, US investigators expended only 65% of the $207,400 originally planned for this project. The Israeli side of the project advanced more directly toward its scientific goals and lists its expenditures in the customary financial report.
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4

Weinberg, Zwi G., Adegbola Adesogan, Itzhak Mizrahi, Shlomo Sela, Kwnag Jeong, and Diwakar Vyas. effect of selected lactic acid bacteria on the microbial composition and on the survival of pathogens in the rumen in context with their probiotic effects on ruminants. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7598162.bard.

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This research project was performed in context of the apparent probiotic effect of selected lactic acid bacteria (LAB) silage inoculants on the performance of ruminants (improved feed intake, faster live-weight gain, higher milk yields and improved feed efficiency). The overall objective was to find out how LAB affect ruminant performance. The project included several “chapters” as follows: 1. The effect of LAB silage inoculants on the survival of detrimental bacteria in rumen fluid, in vitro study (Weinberg et al., The Volcani Center). An in vitro model was developed to study the interaction between selected LAB and an E. coli strain tagged with green fluorescence protein (GFP) in buffered RF. Results indicated that both LAB inoculants and E. coli survived in the RF for several days; both LAB inoculants and LAB-treated silages did not affect survival of E. coli in rumen fluid in vitro. The effect of feeding baled wheat silages treated with or without three selected LAB silage inoculants on the performance of high-lactating cows (Weinberg et al., The Volcani Center). Treatments included control (no additive), Lacobacillusbuchneri40788 (LB), Lactobacillus plantarumMTD1 40027 (LP) and Pediococcuspentosaceus30168 (PP), each applied at 10⁶ cfu/g FM. The silages were included in the TMR of 32 high milking Holstein cows in a controlled feeding experiment. All baled silages were of good quality. The LB silage had the numerically highest acetic acid and were the most stable upon aerobic exposure. The cows fed the LB silages had the highest daily milk yields, percent milk fat and protein. The microbiome of baled wheat silages and changes during ensiling of wheat and corn (Sela et al., The Volcani Center). Bacterial community of the baled silages was dominated mainly of two genera in total, dominated by Lactobacillus and Clostridium_sensu_stricto_12 with 300 other genera at very low abundance. Fungal community was composed mainly of two genera in total, dominated by Candida and Monascuswith 20 other genera at very low abundance. In addition, changes in the microbiome during ensiling of wheat and corn with and without addition of L. plantarumMTD1 was studied in mini-silos. Overall 236 bacterial genera were identified in the fresh corn but after 3 months Lactobacillus outnumbered all other species by acquiring 95% of relative abundance. The wheat silage samples are still under analysis. The effect of applying LAB inoculants at ensiling on survival of E. coli O157:H7 in alfalfa and corn silages(Adesogan et al., University of Florida). E. coli (10⁵ cfu/g) was applied to fresh alfalfa and corn at ensiling with or without L. plantarumor L. buchneri. The pathogen was added again after about 3 moths at the beginning of an aerobic exposure period. The inoculants resulted in faster decrease in pH as compared with the control (no additives) or E. coli alone and therefore, the pathogen was eliminated faster from these silages. After aerobic exposure the pathogen was not detected in the LAB treated silages, whereas it was still present in the E. coli alone samples. 5. The effect of feeding corn silage treated with or without L. buchnerion shedding of E. coli O157:H7 by dairy cows (Adesogan et al., UFL). BARD Report - Project 4704 Page 2 of 12 Five hundred cows from the dairy herd of the University of Florida were screened for E. coli shedding, out of which 14 low and 13 high shedders were selected. These cows were fed a total mixed ration (TMR) which was inoculated with E. coli O157:H7 for 21 days. The TMR included corn silage treated with or without L. buchneri. The inoculated silages were more stable upon aerobic exposure than the control silages; the silage inoculant had no significant effect on any milk or cow blood parameters. However, the silage inoculant tended to reduce shedding of E. coli regardless of high or low shedders (p = 0.06). 6. The effect of feeding baled wheat silages treated with or without three selected LAB silage inoculants on the rumen microbiome (Mizrahi et al., BGU). Rumen fluid was sampled throughout the feeding experiment in which inoculated wheat silages were included in the rations. Microbial DNA was subsequently purified from each sample and the 16S rRNA was sequenced, thus obtaining an overview of the microbiome and its dynamic changes for each experimental treatment. We observed an increase in OTU richness in the group which received the baled silage inoculated with Lactobacillus Plantarum(LP). In contrast the group fed Lactobacillus buchneri(LB) inoculated silage resulted in a significant decrease in richness. Lower OTU richness was recently associated in lactating cows with higher performance (Ben Shabatet al., 2016). No significant clustering could be observed between the different inoculation treatments and the control in non metric multi-dimentional scaling, suggesting that the effect of the treatments is not the result of an overall modulation of the microbiome composition but possibly the result of more discrete interactions. Significant phylum level changes in composition also indicates that no broad changes in taxa identity and composition occurred under any treatment A more discrete modulation could be observed in the fold change of several taxonomic groups (genus level analysis), unique to each treatment, before and after the treatment. Of particular interest is the LB treated group, in which several taxa significantly decreased in abundance. BARD Report - Project 4704 Page 3 of 12
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