Relevant bibliographies by topics / Antagonistic bacteria

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Academic literature on the topic 'Antagonistic bacteria'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Antagonistic bacteria"

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Sumer, Horuz, and Aysan Yesim. "Biological control of watermelon seedling blight caused by Acidovorax citrulli using antagonistic bacteria from the genera Curtobacterium, Microbacterium and Pseudomonas." Plant Protection Science 54, No. 3 (May 15, 2018): 138–46. http://dx.doi.org/10.17221/168/2016-pps.

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The biological control of the watermelon seedling blight and fruit blotch disease was investigated by screening the potential use of antagonistic bacteria. Between May and August 2012, totally 322 putative antagonistic bacteria were isolated from symptomless melon and watermelon plants grown in Adana, Hatay, and Osmaniye provinces of the Eastern Mediterranean Region of Turkey. In vitro dual culture tests showed that 54 out of 322 strains inhibited the Acidovorax citrulli (Ac) growth with an appearance of clear zones between 2.3 and 27.0 mm in diameter. However, the remaining 268 strains did not exhibit any antagonistic activity against Ac. Seed treatments with fourteen individual antagonistic bacteria resulted in a significant reduction in disease incidence (DI) and severity (DS) ranging between 14.06–79.47% and between 4.57–41.49%, respectively. The bacteria Pseudomonas oryzihabitans (Antg-12), Microbacterium oxydans (Antg-57), Curtobacterium flaccumfaciens (Antg-198), and Pseudomonas fluorescens (Antg-273) were the most potent antagonistic bacterial isolates which reduced DI and DS as compared to the untreated control. This study suggested the potential of bacterial antagonists Curtobacterium flaccumfaciens, Microbacterium oxydans, Pseudomonas oryzihabitans, and Pseudomonas fluorescens for the biocontrol of Ac-induced bacterial fruit blotch (BFB).
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Semenov, A. V., A. V. Sgibnev, S. V. Cherkasov, and O. V. Bukharin. "Bacterial regulation of antagonistic activity of bacteria." Bulletin of Experimental Biology and Medicine 144, no. 5 (November 2007): 702–5. http://dx.doi.org/10.1007/s10517-007-0410-6.

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Nayak, Shubhransu. "Potential Bacterial Antagonists from Cowshed Air for the Management of Fusarium Pathogens in Stored Rice." Open Access Journal of Microbiology & Biotechnology 5, no. 5 (2021): 1–8. http://dx.doi.org/10.23880/oajmb-16000178.

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Rice is the principal staple food for more than half population of earth which is infested by many pathogens including Fusarium . Numbers of Fusarium species are responsible for causing pathogenic implications in rice like bakanae, rot, blight, etc. Majority of them produce mycotoxins which are responsible for human and animal toxicity and the cause of cancer disease. Adoption of biological control methods utilizing microbial antagonists might be an eco-friendly option. Bacterial species including Bacillus species have been isolated from various sources for utilisation as biocontrol agents to combat crop pathogens. Cow dung and the cow shed air have been a good source of such antagonistic bacteria. Hence, in the current study eighteen bacteria (BC1 to BC18) including Bacillus species have been isolated from cow shed air and paddy seeds stored in cowshed of Odisha, India. Bacteria isolated from domestic cowshed showed excellent inhibitory capacity than those of commercial cowshed against pathogenic Fusarium F90 and pathogenic as well as fumonisin producing Fusarium F55. Non-fumonisin producer Fusarium F90 was inhibited relatively with higher degree by all the antagonistic bacteria even it was completely suppressed by BC6 after three days of interaction. Paddy seeds stored in cowshed were found to be saturated with cowshed antagonistic bacteria. These bacterial antagonists hold potential to be utilized as Biological Control Agents (BCA) for safeguarding rice production. Investigation on more number of bacterial species from more cowsheds will definitely give more insights in the pattern and mode of inhibition.
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PRAZDNOVA, E. V., A. V. GOROVTSOV, V. A. CHISTYAKOV, N. G. VASILCHENKO, and L. E. KUKHARENKO. "THE INFLUENCE OF SOIL TYPE AND PRECEDING CROP ON THE SUPPRESSION OF FUSARIUM BY INDIGENOUS SPORE-FORMING BACTERIA." Periódico Tchê Química 16, no. 33 (March 20, 2019): 225–40. http://dx.doi.org/10.52571/ptq.v16.n33.2019.240_periodico33_pgs_225_240.pdf.

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Restoring and improving soil fertility, increasing the productivity of cultivated plants is one of the objectives of agricultural production. The aim of the present work was to study the antagonistic interactions between the soil bacteria of the order Bacillales and phytopathogenic fungi. The spore-forming soil bacteria attract increasing interest as biocontrol agents, but little is known about the influence of local soil conditions on the development of antagonism in indigenous bacterial strains. This can lead to unsuccessful attempts of bacterial antagonists isolation. To determine the sequences of primary nucleotide DNA, the authors used the Sanger sequencing method, the detection of sequencing products was performed automatically, using themethod of capillary electrophoresis. Homology of at least 97% was considered as the criterion for classifying a microorganism as a certain species. This study presents new data on the influence of soil type and preceding crop on the level of antagonism against Fusarium and Plectosphaerella. The results show that both the soil type and preceding crop influence the fungal-bacterial antagonistic interactions. The strongest antagonistic activity among all bacterial isolates was found in bacteria isolated from AlbicPhaeozem. The highest antagonistic activity against F. graminearum was shown by strains that were isolated from soils on which winter wheat was the preceding crop.
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Nur Aeny, Titik, Radix Suharjo, and Subli Mujim. "SKRINING BAKTERI ANTAGONIS RALSTONIA SP., PENYEBAB PENYAKIT LAYU BAKTERI PISANG DI LAMPUNG." Jurnal Hama dan Penyakit Tumbuhan Tropika 7, no. 2 (September 13, 2007): 100–110. http://dx.doi.org/10.23960/j.hptt.27100-110.

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Screening on Antagonistic Bacteria of Ralstonia sp., the Causal Agent of Banana Bacterial Wilt in Lampung. This study was conducted on May to October 2006. This study was aimed to screen and collect potential bacterial antagonists toward Ralstonia sp., the causal agent of banana bacterial wilt; to identify the collected potential antagonists, and to test the capability of the bacterial antagonist in vitro. A survey to collect soil samples was conducted in 5 districts in Lampung, namely Bandar Lampung, Lampung Selatan, Tanggamus, Lampung Utara, Lampung Tengah, and Lampung Timur. Identification and test of the antagonistic capability was done in the Plant Disease Laboratory, University of Lampung. Identification of the antagonist bacteria was done through several biochemical tests i.e. : gram reaction, hypersensitive reaction on tobacco, oxidative-fermentative, colony color on YDC medium, fluoresence, nitrate reduction, gelatin reduction and starch hydrolise. The results were then compared to the guidelines of bacterial identification. Twenty one soil samples were collected from those surveyed areas to isolate antagonist bacteria, and 104 isolates were found to be antagonistic to Ralstonia sp.. Based on the biochemical tests, it was showed that 59 isolates were in the group of fluorecent pseudomonad and 45 ones were still unidentified. Out of 104 isolates found, 41 isolates have the ability to inhibit the growth of Ralstonia sp.
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Long, Richard A., and Farooq Azam. "Antagonistic Interactions among Marine Pelagic Bacteria." Applied and Environmental Microbiology 67, no. 11 (November 1, 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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Maknunah, Jauharoh, and Meity Suradji Sinaga. "Eksplorasi dan Karakterisasi Khamir dan Bakteri sebagai Agens Antagonis terhadap Penyebab Penyakit Blas pada Padi." Jurnal Fitopatologi Indonesia 14, no. 3 (October 11, 2018): 83. http://dx.doi.org/10.14692/jfi.14.3.83.

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Exploration of Yeasts and Bacteria as Antagonist Agent of Rice Blast PathogenBlast disease (Pyricularia oryzae) is a major disease of rice that causes 61% yield losses. An alternative way to control the disease is applying antagonistic agents, both yeasts and bacteria. This study was aimed to obtain yeast and bacterial isolates that can be used as antagonistic agents to effectively control blast disease. Yeasts and bacteria were isolated from the leaves of Digitaria sp., Panicum sp., and Pennisetum sp.. The isolates of yeasts and bacteria were screened following hypersensitive test on tobacco leaves, direct planting method test on ‘Ciherang’ rice seed, and hemolysis test on blood agar medium. The isolates were also further assayed for their antagonism through dual culture test, volatile compound test, hyperparasitism test, and chitinolytic activity test. Three isolates of yeast, i.e. Cryptococcus sp., Rhodotorula sp., and Candida sp., and two bacterial isolates, i.e. Bacillus sp. and isolate PPY were identified as potential antagonists of P. oryzae.
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Patkowska, E., and M. Konopiński. "Antagonistic bacteria in the soil after cover crops cultivation." Plant, Soil and Environment 60, No. 2 (February 18, 2014): 69–73. http://dx.doi.org/10.17221/774/2013-pse.

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The purpose of the studies was to establish the quantitative composition of bacteria Bacillus spp. and Pseudomonas spp. and their antagonistic effect towards soil-borne fungi after the cultivation of oats, spring vetch and tansy phacelia as intercrop cover plants. The total population of bacteria in 1 g dry weight of the soil from the experimental combination where mulch of oats was used was larger than in the combination with spring vetch or tansy phacelia. Totally, approximately three times as much Bacillus spp. was obtained from soil samples as compared to Pseudomonas spp. Tests showed that the most isolates of antagonistic bacteria out of the enumerated genera occurred in the soil after oats cultivation, and the least in the soil after the cultivation of tansy phacelia. Antagonistic Bacillus spp. and Pseudomonas spp. inhibited the growth and development of Fusarium oxysporum, Haematonectria haematococca and Thanatephorus cucumeris in the most effective way. The greatest total antagonistic effect of Bacillus spp. and Pseudomonas spp. towards Altenaria alternata, F. culmorum, F. oxysporum, H. haematococca, P. irregulare and T. cucumeris was found out after managing the mulch of oats. The smallest total antagonistic effect of bacteria was observed after managing the mulch of tansy phacelia.
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Halim, Rashidah Abd, Nor'Aishah Hasan, and Kogeethavani Ramachandran. "Screening of Endophytic Bacteria as Biocontrol Agents Against Bacteria Leaf Blight (Xanthomonas oryzae)." HAYATI Journal of Biosciences 27, no. 3 (July 1, 2020): 215. http://dx.doi.org/10.4308/hjb.27.3.215.

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Bacterial leaf blight (BLB) is one of major threats in rice production as it can cause 100% yield loss. Concern on the environment and human health has led an attempt to replace existing methods of chemical control and avoid extensive use of bactericides by using endophytic bacteria. The present study was conducted to screen and characterize bacteria isolated from different sources that has potential as antagonistic bacteria against Xanthomonas oryzaepv. oryzae (Xoo), the causal agent of bacterial leaf blight of paddy. Two hundred and thirty-three endophytic bacteria were successfully isolated from roots and leaves from paddy field. Only 17 endophytic bacterial isolates showed positive antagonistic activity indicated by inhibition zone around bacterial colony against Xoo on nutrient agar plate with 2 endophytic isolates (BCA 3 and BCA 12) showed highest inhibitory effect with 35±0.00 mm in diameter. Molecular identification by 16S rRNA amplification successfully identified the antagonistic endophytic bacteria as Pseudomonas fluorescensand Geobacillus thermoparaffinivorans. Findings in this study revealed the biocontrol abilities of isolated endophytes as an excellent option to be used by agriculture sectors to have sustainable environment.
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Krechel, Annette, Annekathrin Faupel, Johannes Hallmann, Andreas Ulrich, and Gabriele Berg. "Potato-associated bacteria and their antagonistic potential towards plant-pathogenic fungi and the plant-parasitic nematodeMeloidogyne incognita(Kofoid & White) Chitwood." Canadian Journal of Microbiology 48, no. 9 (September 1, 2002): 772–86. http://dx.doi.org/10.1139/w02-071.

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To study the effect of microenvironments on potato-associated bacteria, the abundance and diversity of bacteria isolated from the rhizosphere, phyllosphere, endorhiza, and endosphere of field grown potato was analyzed. Culturable bacteria were obtained after plating on R2A medium. The endophytic populations averaged 103and 105CFU/g (fresh wt.) for the endosphere and endorhiza, respectively, which were lower than those for the ectophytic microenvironments, with 105and 107CFU/g (fresh wt.) for the phyllosphere and rhizosphere, respectively. The composition and richness of bacterial species was microenvironment-dependent. The occurrence and diversity of potato-associated bacteria was additionally monitored by a cultivation-independent approach using terminal restriction fragment length polymorphism analysis of 16S rDNA. The patterns obtained revealed a high heterogeneity of community composition and suggested the existence of microenvironment-specific communities. In an approach to measure the antagonistic potential of potato-associated bacteria, a total of 440 bacteria was screened by dual testing for in vitro antagonism towards the soilborne pathogens Verticillium dahliae and Rhizoctonia solani. The proportion of isolates with antagonistic activity was highest for the rhizosphere (10%), followed by the endorhiza (9%), phyllosphere (6%), and endosphere (5%). All 33 fungal antagonists were characterized by testing their in vitro antagonistic mechanisms, including their glucanolytic, chitinolytic, pectinolytic, cellulolytic, and proteolytic activity, and by their BOX-PCR fingerprints. In addition, they were screened for their biocontrol activity against Meloidogyne incognita. Overall, nine isolates belonging to Pseudomonas and Streptomyces species were found to control both fungal pathogens and M. incognita and were therefore considered as promising biological control agents. Key words: biocontrol, antagonistic potential, plant-associated bacteria.
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Dissertations / Theses on the topic "Antagonistic bacteria"

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Dixit, Sameer M. "Antagonistic activity of probiotic bacteria based on bacterial diversity in the porcine gut." View thesis, 2004. http://handle.uws.edu.au:8081/1959.7/35614.

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Thesis (Ph.D.)--University of Western Sydney, Hawkesbury, 2004.
A thesis presented to the University of Western Sydney, Hawkesbury, Centre for Advanced Food Research, in fulfilment of the requirements for the degree of Doctor of Philosophy. Includes bibliographies.
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Revetta, Randy P. "Isolation and identification of freshwater bacteria antagonistic to Giardia Intestinalis." Cincinnati, Ohio : University of Cincinnati, 2006. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1141305893.

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Thesis (M.S.)--University of Cincinnati, 2006.
Title from electronic thesis title page (viewed Apr. 13, 2006). Includes abstract. Keywords: Giardia intestinalis; Cytophaga-Flavobacterium; Cyst degradation; Microbial antagonism. Includes bibliographical references.
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Tydings, Heather Anne. "Identification and Optimization of the Antagonistic Potential of Native Spinach Microbiota towards Escherichia coli O157:H7." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/43364.

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Leafy greens such as spinach have been the object of several recent food-borne pathogen outbreaks. The purpose of this study was to isolate bacteria spinach epiphytic bacteria that inhibit growth of E. coli O157:H7, which we describe as antagonism. The mechanism of antagonism was investigated and we attempted to improve the antagonistic potential in vitro and on spinach leaves when cellobiose, a carbon source utilized by the antagonists but not E. coli O157:H7, was added. There were larger culturable populations of bacteria on the leaves of savoyed cultivars compared to flat. From the isolated colonies, 47 displayed antagonism towards E.coli O157:H7, and were identified as members of 11 different genera and sixteen species. A representative isolate from each species was evaluated for three possible mechanisms of antagonism: acid production, secretion of an inhibitory compounds or secreted protease. The majority (14/16) produced at least a moderate level of acid. Two of these strains, Paenibacillus polymyxa and Pseudomonas espejiana, were found to secrete a non- protease antagonistic compound. These antagonists varied in their reduction of E.coli O157:H7 numbers in vitro, but all significantly reduced numbers in 48 hours of co-culturing in nutrient rich media. Five antagonists resulted in a significant reduction in E.coli O157:H7 populations when co-cultured on spinach leaves. Application of cellobiose did not improve the amount of antagonism in vitro or on the leaf surface after 24 hours.
Master of Science
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REVETTA, RANDY PRIMO. "ISOLATION AND IDENTIFICATION OF FRESHWATER BACTERIA ANTAGONISTIC TO GIARDIA INTESTINALIS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1141305893.

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Saijonma-Koulumies, Leena E. M. "Bacterial interference in the control of canine pyoderma." Thesis, Royal Veterinary College (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368117.

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Mahdy, Magdy. "Biological control of plant parasitic nematodes with antagonistic bacteria on different host plants." Bonn : Rheinische Friedrick-Wilhelms-Universität, Institut für Pflanzenkrankheiten, 2002. http://hss.ulb.uni-bonn.de/ulb_bonn/diss_online/landw_fak/2002/mahdy_magdy/0203.pdf.

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Kumar, Pratheesh [Verfasser]. "Study on Antagonistic and Growth Promotion Potential of Certain Exo and Endophytic Bacteria of Mulberry (Morus SPP.) : Biological control / Pratheesh Kumar." München : GRIN Verlag, 2019. http://d-nb.info/118869961X/34.

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Chidburee, Siripun. "Biological control of soil-borne disease in soybean by denitrifying antagonistic bacteria : the possible role of reduced nitrogen compounds for control of plant pathogens." Thesis, University of Aberdeen, 1998. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602299.

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A number of experiments were carried out to study the potential of denitrifying bacteria and reduced nitrogen compounds for control of soil-borne damping-off pathogens. Measurement of the rhizosphere pH of growing soybean roots was carried out in soil adjusted to different pH states and packed into sheet microcosms. The results showed that the rhizosphere pH of soybean was lower than the bulk soil. Nitrate reductase activity and nitrite production was then characterised for the rhizosphere of intact 14 day-old soybean roots that were incubated in nitrate substrates adjusted to different pH values under water-logged conditions. The results showed that the rate and the quantity of nitrite production increased with increasing nitrate concentration and pH in the solution. A growth room experiment was carried out to determine root colonization by denitrifying bacteria in relation to disease caused by soil-borne pathogens, which are favoured by high soil moisture (approximately -5 KPa) and low oxygen levels. Nitrite producing bacteria were isolated from soybean roots grown in Grampian (Insch) soils which had not been cropped with soybean and Thai (Phitsanulok) soils which previously had been cropped with soybean. In the first pot experiment, the nitrite producing bacteria were isolated from different root sections of 12 and 19 day-old soybean plants after 8 weeks of continuous cropping of soils with soybean (a new crop was planted every week), and using different isolation media in order to determine the genus/species composition of the denitrifying bacteria on the rhizoplane. The results showed that continuous cropping of Thai soil and Insch soil with soybean increased pre-emergence damping-off disease and decreased fresh weight yields in seedlings that did emerge. ANOVA showed significant differences between root sections for most bacterial groups monitored {Bacillus spp., Pseudomonas and Enterobacteriaceae), with regression analysis generally showing densities increasing with root age or toward the shoot base. All nitrite producing bacterial isolates were screened for antifungal activity against Macrophomina phaseolina on agar plates and between 10 and 25% of nitrite producing bacteria were found to show in vitro antagonism. In a second pot experiment, the nitrite producing bacteria were isolated from root tissue below the crown (5 cm in length) every 2 weeks of continuous cropping of soils with soybean (a new crop was planted every 2 weeks). Plate-counting was carried out to determine the population of nitrite producing bacteria while a liquid culture MPN method was used for determination of NO, N2O and N2 producing bacteria. Linear regression analysis of the incidence of pre-emergence damping-off and soybean yields in seedling that did emerge showed a highly significant negative correlation between these parameters for both soils. ANOVA showed that there was a significant difference between soil type, with the Thai soil showing higher population densities of antagonistic bacteria on soybean roots. All nitrite producing bacterial isolates were screened for antifungal activity, but the plant pathogenic fungus, Pythium ultimum, was used in this experiment. The results showed that between 10 and 40% of nitrite producing bacteria showed in vitro antagonism. However, regression analysis showed that there was no significant increase or decrease in the nitrite producing antagonistic bacterial population with continuous soybean cropping. All 900 isolates of nitrite producing bacteria isolated from the soybean rhizoplane were screened for antagonistic activity towards Pythium ultimum based on a pot trial assay in the greenhouse. As expected, very low numbers of nitrite producing bacteria showed activity against P. ultimum and only one isolate gave a significant reduction in disease incidence in pot trials. The interactive effects of nitrite producing antagonist and an Arbuscular Mycorrhizal fungus (Glomus mosseae) and Bradryrhizobium japonicum, on control of the fungal pathogens, P. ultimum or M. phaseolina were investigated in the greenhouse. The results showed that improved plant growth was obtained with certain combined inocula involving nitrite producing bacterial antagonists, Glomus mosseae and Bradryrhizobium japonicum.
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Souza, Ariane do Carmo. "Controle biológico de Alternaria alternata, agente causal da mancha marrom de alternaria, por Bacillus SPP." Universidade Federal de São Carlos, 2018. https://repositorio.ufscar.br/handle/ufscar/10473.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
The alternaria brown spot, caused by Alternaria alternata f sp. citri, causes large economic damages in tangor Murcott (Citrus sinensis Osbeck x Citrus reticulata [L.] Blanco). Its control is carried out through the spraying of agrochemicals, implying up to 15 pulverizations per year, which causes an increase in the production costs of the cultures and damages to the environment. As an alternative, the use of microorganisms, in particular Bacillus spp., has been used to diseases’ control. Therefore, the aim of this work was to evaluate the viability of Bacillus spp in in vitro and in vivo conditions. The methodologies were based on the interactions between biological control agents (Bacillus spp.) and the phytopathogen A. alternata, evaluated by the paired culture technique, by the production of volatile, thermostable and cell-free metabolites by different Bacillus spp. isolates. The molecular identification of the isolates tested and the efficacy of bacterial isolates were evaluated in leaves and plants under greenhouse conditions. The results showed that most of the isolates affected the development of phytopathogen and produced some types of metabolite, being antibiosis one of the probable mechanisms of action of the bacterium. The isolates ACB-01, ACB-07, ACB-08, ACB-18 and ACB-57 presented potential for disease control of A. alternata.
A mancha marrom de alternaria, causada por Alternaria alternata f sp. citri, causa grandes danos econômicos em tangor Murcott (Citrus sinensis L. Osbeck x Citrus reticulata [L.] Blanco). Seu controle é realizado através de pulverizações com agroquímicos, implicando em até 15 pulverizações por ano, o que acarreta em aumento no custo de produção da cultura e prejuízos ao meio ambiente. Como alternativa, o uso de microrganismos, em particular, as bactérias do gênero Bacillus spp., têm sido empregadas para o controle de doenças. Portanto, esse trabalho teve por objetivo avaliar em condições in vitro e in vivo a viabilidade de 47 isolados de Bacillus spp. para o controle da doença. As metodologias foram embasadas nas interações entre agentes de controle biológico (Bacillus spp.) e o fitopatógeno A. alternata avaliadas pela técnica de cultivo pareado, pela produção de metabólitos voláteis, termoestáveis e livre de células por diferentes isolados de Bacillus spp.. Realizou-se, ainda, a identificação molecular dos isolados testados e a eficácia dos isolados da bactéria em folhas destacadas e em plantas, sob condições de casa de vegetação. Os resultados obtidos mostraram que a maioria dos isolados afetou o desenvolvimento do fitopatógeno e produziram algum tipo de metabólito, sendo, a antibiose um dos prováveis mecanismos de ação da bactéria. Os isolados ACB-01, ACB-07, ACB-08, ACB-18 e ACB-57 apresentaram potencial para o biocontrole de A. alternata.
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Goh, Wai Kean Chemistry Faculty of Science UNSW. "Novel antagonists of bacterial signaling pathways." Publisher:University of New South Wales. Chemistry, 2008. http://handle.unsw.edu.au/1959.4/41458.

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Traditional bacterial disease therapies utilize compounds that ultimately kill the target bacteria but it exerts a strong selective pressure on the bacteria to develop multi-drug resistance mutants. The increasing occurrence of resistance in common pathogens has highlighted the need to identify new anti-microbials that target the control of bacterial pathogenicity in a non-extermination manner to reduce the incidence of bacteria resistance. One new strategy exploits the discrete signaling molecules that regulate the various bacterial signaling pathways, which are responsible for the expression of pathogenicity traits. Halogenated furanones (fimbrolides) from the marine red alga, Delisea pulchra have been shown to interfere with the key signaling pathway present in Gram-negative bacteria by competitively displacing the cognate signaling molecule from the transcription protein. This project focused on the design and synthesis of 1,5-dihydropyrrol-2-ones, a new class of fimbrolide derivatives capable of displaying strong antagonistic properties of the fimbrolides. Primary synthetic methodologies examined include the halolactamization of allenamides and the direct lactone-lactam transformation. No doubt, both methodologies yielded the lactam ring, the former failed to introduce the crucial C-5 bromomethylene group essential for bioactivity. A facile high yielding two-step lactone-lactam transformation method was developed and using this method, a wide range of substituted 5-bromomethyl- and 5-dibromomethylene-1,5-dihydropyrrol-2-ones were synthesized. Furthermore, a new class of tricyclic crown-ether type compounds with no literature precedent were discovered. To vary the diversity of the compounds, a related class of compounds, 5,6-dihydroindol-2-ones, were examined. A general versatile method for the synthesis of 7-substituted 5,6-dihydroindol-2-ones was developed. The synthetic strategy proceeds via the established Suzuki-Miyaura cross-coupling reaction of halogenated dihydroindol-2-ones with arylboronic acids/esters. The Suzuki methodology was found to be reliable in furnishing a wide range of 7-substituted products in high yields. A preliminary molecular modeling approach was used to assist in the design of new anti-microbials via the ligand-docking analyses of the TraR and LasR protein. A positive correlation was observed between the docking scores and biological activity and the methodology was further developed into an initial screening tool to filter potential active and non-active compounds. The newly synthesized compounds were analysed for their efficacy in reducing the expression of the Green Fluorescent Protein (GFP) in the presence of natural AHL signaling molecules in an AHL-monitor strain, indicative of the inhibition of bacterial phenotype expression. The dihydropyrrol-2-one class of compounds showed significant biological activity and this highlighted their potential for further development.
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Books on the topic "Antagonistic bacteria"

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Dixit, Sameer M., and Kasipathy Kailasapathy. Antagonistic activity and interaction of probiotic bacteria with intestinal microbiota. Hauppauge, N.Y: Nova Science Publishers, 2012.

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Erik, Nord Carl, ed. The role of piperacillin/tazobactam in the treatment of polymicrobial infections. Montreal: PharmaLibri, 1994.

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Nuclo, Raymond L. Natural spread of and competition between two bacterial antagonists of the fire blight pathogen, Erwinia amylovora, on blossoms of Bartlett pear. 1997.

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Enzyme-mediated resistance to antibiotics: Mechanisms, dissemination, and prospects for inhibition. Washington, DC: ASM Press, 2007.

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(Editor), Robert A. Bonomo, and Marcelo E. Tolmasky (Editor), eds. Enzyme-Mediated Resistance to Antibiotics: Mechanisms, Dissemination, and Prospects for Inhibition. ASM Press, 2007.

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C, Moellering Robert, ed. Therapeutic implications of treatment with beta-lactamase inhibitor combinations. Montreal: PharmaLibri Publishers, 1994.

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Watts, Richard A., and Eleana Ntatsaki. Miscellaneous vasculitides. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0137.

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The vasculitides are a group of relatively rare conditions with a broad spectrum of clinical presentations that can cause significant morbidity and mortality. Classification of the vasculitic syndromes is done according to the size of the vessels affected and also the presence of anti-neutrophil cytoplasmic antibodies (ANCA). Vasculitides can be either primary or secondary to an underlying systemic disease, malignancy, or infection. This chapter covers the spectrum of the secondary vasculitides; some of the non-ANCA-associated primary vasculitides and miscellaneous types of vasculitic syndromes. Secondary vasculitis can occur in the background of systemic rheumatic diseases such as rheumatoid arthritis, spondyloarthropathies, or other connective tissue diseases. Vasculitis can also present in relation to precipitants such as drugs (propylthiouracil, hydralazine, leucotriene antagonists) or vaccines. Infection (bacterial, mycobacterial, viral, and fungal) has been associated with vasculitis either as a trigger or as a consequence of iatrogenic immunosuppression. Infection-related vasculitis can affect all types and sizes of vessels. Certain forms of vasculitis such as cryoglobulinaemia are closely associated with viral infections and more specifically with HCV infection. There are forms of vasculitis, which appear to be isolated or localized to a single organ, or site (skin, gastrointestinal, genital, and primary central nervous system vasculitis) that may be histologically similar to systemic syndromes, but have a different prognosis. Other conditions that may mimic vasculitis and miscellaneous conditions such as Cogan's syndrome and relapsing polychondritis are also discussed.
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Book chapters on the topic "Antagonistic bacteria"

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Gudkov, A. V., G. D. Perfiliev, and N. P. Sorokina. "Antagonistic Effects of Lactic Acid Bacteria on Enterobacteria." In MILK the vital force, 100. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3733-8_86.

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Qi, Fengxia, and Jens Kreth. "Methods to Study Antagonistic Activities Among Oral Bacteria." In Methods in Molecular Biology, 203–18. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-6685-1_12.

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Hossain, M. "The Antagonistic Effects of Fluorescent Pseudomonas Spp. on Plant Growth and the Control of Softrot and Blackleg of Potato." In Plant Pathogenic Bacteria, 935–43. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3555-6_202.

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Brockhurst, Michael A., Britt Koskella, and Quan-Guo Zhang. "Bacteria-Phage Antagonistic Coevolution and the Implications for Phage Therapy." In Bacteriophages, 1–21. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-40598-8_7-1.

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Brockhurst, Michael A., Britt Koskella, and Quan-Guo Zhang. "Bacteria-Phage Antagonistic Coevolution and the Implications for Phage Therapy." In Bacteriophages, 231–51. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-41986-2_7.

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Debao, Li, Zhu Weiguang, Chen Weiliang, Chen Xiongfong, Xu Ping, Zhang Yongping, and Ge Qixing. "Study of Antagonistic Proteins of Bacteria to Xanthomonas Oryzae Pv. Oryzae." In Biotechnology in Agriculture, 439–43. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1779-1_86.

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Senthilkumar, M., N. Amaresan, and A. Sankaranarayanan. "Antagonistic Activity of Volatile Compound of Bacteria Against Phytopathogens: Dual Plate Assay." In Springer Protocols Handbooks, 171–73. New York, NY: Springer US, 2020. http://dx.doi.org/10.1007/978-1-0716-1080-0_45.

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Caldeira, Ana Teresa. "Green Mitigation Strategy for Cultural Heritage Using Bacterial Biocides." In Microorganisms in the Deterioration and Preservation of Cultural Heritage, 137–54. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69411-1_6.

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AbstractThe microbiota present in cultural heritage objects, made by diverse inorganic and organic materials and inserted into particular environment, represents a complex and dynamic ecosystem composed by bacteria, cyanobacteria, fungi, algae and lichens, which can induce decay by biological mechanisms. To control the microbial growth several methods are being applied such as mechanical and physical processes and chemical biocides. However, these methods have several weaknesses like be dangerous to handle, material incompatibility or produce environmental and health hazards. Therefore, the identification of effectively biodeteriogenic agents and the design of mitigation strategies directed to these agents without prejudice to historical materials, to the environment and to operators, taking into account the microbial community’s dynamics, is an important challenge to control biodeterioration of cultural heritage. Bacteria, in particular Bacillus spp. are worth for the creation of new green biocides solutions because they produce a great variety of secondary metabolites including ribosomally and non-ribosomally synthesized antimicrobial peptides, known to possess antagonistic activities against many biodeteriogenic fungi and bacteria. The discovery of new safe active compounds and green nanotechnology for direct application in cultural heritage safeguard can in a close future contribute to potentiate a new generation of biocides and safe sustainable methods for cultural heritage.
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Halda, L., J. Levic, M. Denic, V. Pencic, and C. A. Neyra. "Nitrogen Fixing Bacteria Isolated From Maize Root and Antagonistic Activity Against Fusarium Sp." In Nitrogen Fixation, 305–6. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3486-6_58.

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Parthasarathy, V., G. S. Prasad, and R. Manavalan. "Characterisation of Streptomycetes from Lignite Mines and their Antagonistic Activity Against Bacteria and Fungi." In Recent Advancements in System Modelling Applications, 451–62. India: Springer India, 2013. http://dx.doi.org/10.1007/978-81-322-1035-1_40.

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Conference papers on the topic "Antagonistic bacteria"

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Muratova, A. A., and L. N. Valentovich. "Inactivation of genes lysR and mtfA increases antagonistic activity of bacteria Pseudomonas brassicacearum S-1." In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.177.

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Genes lysR and mtfA localized in chromosome of bacteria P. brassicacearum S 1 were inactivated. The role of these genes in the expression of strain antagonistic activity against several bacterial and fungal pathogens was investigated. The technique of markerless mutagenesis of bacteria P. brassicacearum was optimized.
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Anggraeni, Dewi, and Eti Sumiati. "Antagonistic Endosymbion Bacteria against Soft-Rot Bacteria in Phalaenopsis sp." In 1st International Conference on Science and Technology, ICOST 2019, 2-3 May, Makassar, Indonesia. EAI, 2019. http://dx.doi.org/10.4108/eai.2-5-2019.2284682.

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Ibragimova, S. A., and K. A. Malafeeva. "Symbiosis of soil and rhizosphere bacteria." In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.105.

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The presence of symbiosis between different taxonomic groups of soil and rhizosphere bacteria is shown. In the mixed population, a high titer of active cells and the preservation of antagonistic activity against the phytopathogen were noted.
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Karagöz, Kenan. "In-vitro inhibiton of Pantoea ananatis by antagonistic bacteria." In II. INTERNATIONAL CONFERENCE ON ADVANCES IN NATURAL AND APPLIED SCIENCES: ICANAS 2017. Author(s), 2017. http://dx.doi.org/10.1063/1.4981714.

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Lin, Tianxing, Mingfu Gong, Qinlan Guan, Ying Huang, and Fang Qin. "Screening of antagonistic bacteria isolated from Amorphophallus konjac rhizosphere soil." In 2017 INTERNATIONAL CONFERENCE ON BIOTECHNOLOGY AND BIOENGINEERING (ICBB-2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5034299.

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Rafikova, G. F., and E. V. Kuzina. "New bacterial strains Рseudomonas, promising for agricultural biotechnology." In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.205.

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The bacteria P. laurentiana АНТ 17 and P. laurentiana АНТ 56 have plant-beneficial properties: its exhibit antagonistic activity against phytopathogenic micromycetes, are capable of decomposing phosphates and synthesizing phytohormones.
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Bondarchuk, E. Yu, and A. M. Asaturova. "Screening of promising bacterial strains against pests of Lepidoptera." In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.047.

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In laboratory conditions, a screening of 27 new aboriginal strains of bacteria from the Bioresource collection of the Federal State Budgetary Scientific Institution VNIIBZR "State collection of entomoacariphages and microorganisms" was carried out. As a result of the research, 6 new strains of bacteria with high and 2 strains with medium antagonistic activity were identified, which will be further considered for the next stage of research.
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Chaisu, Korawit. "Biological Control of Post-Harvest Banana Diseases Using Antagonistic Bacteria in Thailand." In 2018 IEEE 5th International Conference on Engineering Technologies and Applied Sciences (ICETAS). IEEE, 2018. http://dx.doi.org/10.1109/icetas.2018.8629130.

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Mao, J. N., C. H. Xu, and M. F. Gong. "Screening of Endophytic Bacteria Isolated from Rice Plant Antagonistic Rice Sheath Blight." In 2015 International Conference on Environmental Science and Sustainable Development (ICESSD 2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789814723039_0058.

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Song, Na-Young, Xin Li, Jonathan H. Badger, Jami Willette Brown, Xhonghe Sun, Gongping Shi, Feng Zhu, et al. "Abstract B17: IKKα/STAT3 antagonistic signaling regulates fungi-bacteria endosymbiosis-associated carcinogenesis." In Abstracts: AACR Special Conference on the Microbiome, Viruses, and Cancer; February 21-24, 2020; Orlando, FL. American Association for Cancer Research, 2020. http://dx.doi.org/10.1158/1538-7445.mvc2020-b17.

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