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Littérature scientifique sur le sujet « Bacteria Effect of radiation on »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 1 février 2022

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Articles de revues sur le sujet "Bacteria Effect of radiation on"

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Rajasekhar, E., G. Jaffer Mohiddin, M. Srinivasulu, V. Rangaswamy et R. Jeevan Kumar. « Effect of ionizing radiation on soil bacteria, fungi and germination of red gram seeds (Cajanus cajan L.) ». South Asian Journal of Experimental Biology 3, n^o 1 (10 mars 2013) : 24–30. http://dx.doi.org/10.38150/sajeb.3(1).p24-30.

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Effect of ionizing radiation on survival of bacteria, fungi and red gram seed (Cajanus cajan L.) germination was assessed in laterite soil in the laboratory. The mercury vapor lamp (l = 400 nmâ€700 nm), sodium vapor lamp (l =589.3 nm ) and ultra violet (l = 400 nm â€ 10 nm) radiations were exposed to the laterite soils for 20, 40, 60 and 80 min and their effect on survival of bacterial, fungal colonies and seed germination were enumerated. Sodium vapor was found to be very effective in inhibiting the bacterial and fungal populations. Ultra violet radiation was efficient in reducing the survival of the microbial densities than mercury vapor lamp. In the exposed soil, the germination of seeds in terms of percentage, the stem length (SL) and root length (RL) of seeds were calculated at 7th day of incubation. The laterite soil was shown significant stimulation in the germination of seed at 40 min exposure with ultra violet radiation. Results obtained in the present study indicate that the energy captivated by molecules was prominent at lower radiation and shorter exposure time enhanced the proliferation of bacterial cells and red gram seed germination.

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Patel, Priya, Hiteshi Patel, Dhara Vekariya, Chinmayi Joshi, Pooja Patel, Steven Muskal et Vijay Kothari. « Sonic Stimulation and Low Power Microwave Radiation Can Modulate Bacterial Virulence Towards Caenorhabditis elegans ». Anti-Infective Agents 17, n^o 2 (5 juillet 2019) : 150–62. http://dx.doi.org/10.2174/2211352516666181102150049.

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<P>Background: In view of the global threat of antimicrobial resistance, novel alternative approaches to deal with infectious bacteria are warranted, in addition to the conventional invasive therapeutic approaches. Objective: This study aimed at investigating whether exposure to sonic stimulation or microwave radiation can affect virulence of pathogenic bacteria toward the model nematode host Caenorhabditis elegans. Methods: Caenorhabditis elegans worms infected with different pathogenic bacteria were subjected to sonic treatment to investigate whether such sound treatment can exert any therapeutic effect on the infected worms. Virulence of microwave exposed bacteria was also assessed using this nematode host. Results: Sound corresponding to 400 Hz, and the divine sound ‘Om’ conferred protective effect on C. elegans in face of bacterial infection, particularly that caused by Serratia marcescens or Staphylococcus aureus. The observed effect seemed to occur due to influence of sound on bacteria, and not on the worm. Additionally, effect of microwave exposure on bacterial virulence was also investigated, wherein microwave exposure could reduce virulence of S. aureus towards C. elegans. Conclusion: Sonic stimulation/ microwave exposure was demonstrated to be capable of modulating bacterial virulence.</P>

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ITO, Hitoshi. « Effect of radiation decontamination on drug-resistant bacteria ». FOOD IRRADIATION, JAPAN 41, n^o 1-2 (2006) : 9–13. http://dx.doi.org/10.5986/jrafi.41.9.

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Lin, Tao, Bo Cai et Wei Chen. « Limnoithona sinensis as refuge for bacteria : protection from UV radiation and chlorine disinfection in drinking water treatment ». Canadian Journal of Microbiology 60, n^o 11 (novembre 2014) : 745–52. http://dx.doi.org/10.1139/cjm-2014-0347.

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In this study, we tested the potential of Limnoithona sinensis to provide its attached bacteria refuge against disinfection. The experimental results indicated that in water devoid of zooplankton, both UV radiation and chlorine disinfection significantly decreased the viability of free-living bacteria. In the presence of L. sinensis, however, the attached bacteria could survive and rapidly recover from disinfection. This demonstrated that L. sinensis provided protection from external damage to various aquatic bacteria that were attached to its body. The surviving bacteria remained on L. sinensis after disinfection exposure, which enabled a rapid increase in the bacterial population followed by their subsequent release into the surrounding water. Compared with UV radiation, chlorine disinfection was more effective in terms of inactivating attached bacteria. Both UV radiation and chlorine disinfection had little effect in terms of preventing the spread of undesirable bacteria, due to the incomplete inactivation of the bacteria associated with L. sinensis.

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Hughes, Kevin A. « Effect of Antarctic solar radiation on sewage bacteria viability ». Water Research 39, n^o 11 (juin 2005) : 2237–44. http://dx.doi.org/10.1016/j.watres.2005.04.011.

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Bauza-Kaszewska, Justyna, Krzysztof Skowron, Zbigniew Paluszak, Zbigniew Dobrzański et Mścisław Śrutek. « Effect of Microwave Radiation on Microorganisms in Fish Meals ». Annals of Animal Science 14, n^o 3 (29 juillet 2014) : 623–36. http://dx.doi.org/10.2478/aoas-2014-0020.

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AbstractThis study was aimed at testing the effect of microwave radiation on survival of E. coli, Salmonella Enteritidis, Enterococcus spp. and Clostridium spores in two kinds of fish meals. The material used in the study consisted of samples of two kinds of fish meal – salmon and cod. In the experiment samples of both kinds of fish meals were inoculated with suspensions of tested bacteria and spores of Clostridum sporogenes. After inoculation the material was exposed to microwave radiation with a frequency of 2.45 ghz and microwave energy power of 0, 100, 180, 300, 450, 600 and 700 w, respectively, for 2.5 min for bacteria and 11 minutes for spores. then the reisolated microorganisms were counted and theoretical lethal doses of radiation were determined. among the studied vegetative forms of bacteria, the largest decreases in the numbers at the same radiation dose were observed in the rods of E. coli, whereas the smallest in enterococci. spores of Clostridium sporogenes showed a considerably higher resistance to the effect of that factor. the power of dose resulting in the complete inactivation of the studied bacteria should be about 430 kJ×g–1, and in the case of spores – 1 900 kJ×g–1.

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Alonso-Sï¿½ez, Laura, Josep M. Gasol, Thomas Lefort, Julia Hofer et Ruben Sommaruga. « Effect of Natural Sunlight on Bacterial Activity and Differential Sensitivity of Natural Bacterioplankton Groups in Northwestern Mediterranean Coastal Waters ». Applied and Environmental Microbiology 72, n^o 9 (septembre 2006) : 5806–13. http://dx.doi.org/10.1128/aem.00597-06.

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ABSTRACT We studied the effects of natural sunlight on heterotrophic marine bacterioplankton in short-term experiments. We used a single-cell level approach involving flow cytometry combined with physiological probes and microautoradiography to determine sunlight effects on the activity and integrity of the cells. After 4 h of sunlight exposure, most bacterial cells maintained membrane integrity and viability as assessed by the simultaneous staining with propidium iodide and SYBR green I. In contrast, a significant inhibition of heterotrophic bacterial activity was detected, measured by 5-cyano-2,3 ditolyl tetrazolium chloride reduction and leucine incorporation. We applied microautoradiography combined with catalyzed reporter deposition-fluorescence in situ hybridization to test the sensitivity of the different bacterial groups naturally occurring in the Northwestern Mediterranean to sunlight. Members of the Gammaproteobacteria and Bacteroidetes groups appeared to be highly resistant to solar radiation, with small changes in activity after exposure. On the contrary, Alphaproteobacteria bacteria were more sensitive to radiation as measured by the cell-specific incorporation of labeled amino acids, leucine, and ATP. Within Alphaproteobacteria, bacteria belonging to the Roseobacter group showed higher resistance than members of the SAR11 cluster. The activity of Roseobacter was stimulated by exposure to photosynthetic available radiation compared to the dark treatment. Our results suggest that UV radiation can significantly affect the in situ single-cell activity of bacterioplankton and that naturally dominating phylogenetic bacterial groups have different sensitivity to natural levels of incident solar radiation.

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Dion, Paule, Raymond Charbonneau et Chantal Thibault. « Effect of ionizing dose rate on the radioresistance of some food pathogenic bacteria ». Canadian Journal of Microbiology 40, n^o 5 (1 mai 1994) : 369–74. http://dx.doi.org/10.1139/m94-060.

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Food pathogenic bacteria including Listeria monocytogenes (1A1 and ATCC 19111), Staphylococcus aureus (GD13 and ATCC 13565), Escherichia coli 0157:H7 (ATCC 35150), Salmonella typhimurium, Yersinia enterocolitica, Vibrio parahaemolyticus, and Campylobacter jejuni were exposed to various rates of ionizing radiation (0.78, 2.6, and 22 kGy/h) emitted by three different 60Co irradiators. D10 values (D10 is the radiation dose required to eliminate 90% of a bacterial population (one logarithmic cycle reduction)) were calculated for the various strains and growth conditions tested. A covariance analysis of these results revealed that the dose rates studied had no significant influence on the radiosensitivity of these bacteria. At all dose rates, the bacteria were more radiosensitive when irradiated in a saline solution (0.85% NaCl) than in a chicken breast meat suspension. The growth phase of the bacterial population had a variable influence on its radioresistance. For L. monocytogenes 1A1, Staphylococcus aureus ATCC 13565, E. coli 0157:H7, Y. enterocolitica, and V. parahaemolyticus, radioresistance was not significantly different in the exponential and stationary phases. Populations of L. monocytogenes ATCC 19111 and Staphylococcus aureus GD13 were significantly more resistant in the stationary phase (D10 = 0.23 and 0.12 kGy, respectively) than in the exponential phase (D10 = 0.17 and 0.09 kGy, respectively). Among the pathogenic bacteria investigated in this study, the most radioresistant was L. monocytogenes (D10 = 0.16–0.38 kGy, Gram-positive bacilli) and the most radiosensitive was V. parahaemolyticus (D10 = 0.03–0.04 kGy, halophilic Gram-negative bacilli).Key words: ionization, food pathogenic bacteria, dose rate effect, radioresistance.

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AL.Bayatti, Khalid K. « The Effect of Ionizing Radiation on Microorganism in some spices ». Iraqi Journal of Veterinary Medicine 33, n^o 1 (30 juin 2009) : 149–54. http://dx.doi.org/10.30539/iraqijvm.v33i1.728.

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The present study was undertaken to evaluate the use of ionizing radiation in decontaminating thetotal microbial burden of Capsicum peppers (Capsium annuum), Caraway (Carum carvi), and Clove(Dianthus caryphyllus). The spices were irradiated in polyethylene bags with 5KGy and 10KGy ofgamma radiation from Co-60 irradiator. Total number of bacteria and molds survived per gram ofspices after irradiation were calculated. Results showed that 5KGy gamma radiation reduced the totalnumber of bacteria by 95-98% and the number of molds and yeast by 62.8-98.2%, while 10KGyreduced the total number of bacteria by 95.5-99.9% and the number of the molds and yeast by 67-99.7%. These percentages are accepted within the maximum permissible microbial counts for humanconsumption except mold and yeast counts in caraway which its number was still more than themaximum permissible count for human consumption, and the doses used in these experiments have nosignificant changes on the sensory quality of the spices.

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Lu, Winston I., et Dominic P. Lu. « The Bacteriostatic and Bactericidal Effects of Radiation from Dental and Medical X-Rays ». Acupuncture & ; Electro-Therapeutics Research 45, n^o 1 (24 août 2020) : 3–14. http://dx.doi.org/10.3727/036012920x15958782196790.

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The purpose of this research was to proce or disprove the widely held beliefs that X-ray radiation used in medical or dental applications may affect the normal oral flora, and may also have effects on the micro-organisms existing in the oral cavity of every person. Such beliefs might be due to the common knowledge that radiation therapy has been utilized for the long time in the cancer patients to destroy the cancerous cells, and that radiation are also widely used in agriculture to prolong the shelf life of the farm products by destroying the decay-causing microorganisms existing in the agricultural products such as meats, produce, etc. Since very few research has been conducted in this concerned area, and not much pertinent information in the scientific literature could be found in this regard, a research experiment was set up to find out if these common beliefs have any merits. The research experiment involved selecting BDORT(By-digital O-Ring Test) positive dishes to incubate human saliva collected from a volunteer patient. Once dish served as control which was not subjected X-ray irradiation. Other dishes were subjected X-ray irradiation with various doses of irradiation strength at various time interval such as 1, 3, 5, 7, and 9 seconds to find out if any significant change taken place in the bacteria colonies. The bacterial colonies in the irradiated dishes then compared with that of the control dish so as to draw a conclusion if radiation for medical and dental X-ray machines would actually have any bactericidal or/and bacteriostatic effects on the oral micro-organisms flora. Finally, dishes were brought to a local hospital Radiology Department to use high dose of irradaition (used for cancer therapy) on the dishes to find out to what extent if such a high dose X-ray irradiation emitted from therapeutic cancer therapy machine would affect the number of bacterial colonies in the dishes as when compared with when dishes were under low doses of X-ray irradiation from dental or medical diagnostic X-ray machines. During the experiment, dishes, when irradiated, were sent to a certified medical technologist in the hospital laboratory to count the number of the bacterial colonies, and each change in the bacterial colony number were recorded in to data for biostatic analysis. The data were compared with BDORT negativity scores collected each time before and after dishes were irradiated, thus to find out if any corresponding confirmity between traditional laboratory findings and the score changes from BDORT findings. The results of this experiment revealed the fact that radiation from regular diagnostic X-ray machines possess little effect on bacteria, and that they have little effect on both cells and bacteria present in the human body. Neverthless, dramatically increasing the high radiation dosages does have potential to both inhibit and destroy bacteria. Therefore,using irradiation techniques to inhibit bacterial growth is only useful in agriculture practices, since tens of thousands of irradaiation dosages are necessary for bacteria inhibition. in human, over 500 RADs (radiation absorption dose) is lethal. Therefore, bacterial inhibition could not be practical in humans since it requires tens of thousands of RADs to be useful in the aspect.

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Thèses sur le sujet "Bacteria Effect of radiation on"

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Verma, Meera Mary. « On the effect of UV-irradiation on DNA replication in Escherichia coli ». Title page, contents and summary only, 1985. http://web4.library.adelaide.edu.au/theses/09PH/09phv522.pdf.

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Manners, Vicki. « Molecular studies on the radiation-resistant bacteria Deinococcus radiodurans and Deinobacter grandis ». Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/12557.

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Li, Sha. « Potency of nanoparticles to amplify radiation effects revealed in radioresistant bacteria ». Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112061/document.

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Les thérapies par irradiation sont utilisées pour traiter la plupart des cas de cancer. Une limitation majeure est l’induction de dommages dans les tissus sains. Par conséquent, l’amélioration du ciblage tumoral est un défi majeur. L'addition de nanoparticules (NPs) est proposée comme une nouvelle stratégie pour amplifier les effets des radiations dans les tumeurs (radiosensibilisation ). Les nanoparticules de Z élevé (platine, or, gadolinium) se révèlent être de bons candidats. Afin de développer de nouveaux nanoagents et d’améliorer les plans de traitement, il est nécessaire de mieux comprendre les mécanismes fondamentaux impliqués. Il a été observé que les radiosensibilisateurs augmentent l'effet létal des radiations (ions rapides ou rayons gamma). Ceci est attribué à une cascade d'événements multi-échelle qui comprend l'activation des NPs, leur relaxation, suivi de la production de radicaux responsables de la mort cellulaire (dans les eucaryotes). Il n'est pas encore clair laquelle des étapes, entre l’excitation/relaxation électronique des NPs ou la réponse biologique joue le rôle prédominant. Par conséquent, le défi de ma thèse était de tester les effets de radiosensibilisateurs (NPs d'or, de platine ou à base de gadolinium) sur des cellules autres que des cellules eucaryotes. Pour la première fois, l’effet des NPs a été testé sur la bactérie la plus radiorésistante jamais rapportée, D. radiodurans. Les NPs ont également été testées sur E. coli. Des études à l'échelle moléculaire ont été utilisées pour comprendre les mécanismes élémentaires. En résumé, ce travail montre que les NPs radiosensibilisantes amplifient les effets des rayons γ dans les bactéries radiosensibles et radiorésistantes. Ceci est attribué à la production de grappes de radicaux et à l’induction de dommages nanométriques dans l'ADN mais également dans les protéines de réparation. Finalement la radiosensibilisation est un phénomène «universel» qui peut être induite dans tout organisme vivant. En d'autres termes, les mécanismes élémentaires liés à l’excitation/relaxation de la NP jouent un rôle majeur par rapport à la réponse biologique de la cellule. Enfin, un ensemble de méthodes ont été optimisées pour évaluer la toxicité et observer l’internalisation des NPs dans les bactéries
Radiation therapies are used to treat most of the cancer cases. One major limitation is the damage induced in the healthy tissues and tumor targeting is a major challenge. The addition of nanoparticles (NPs) is proposed as a novel strategy to amplify the radiations effects in the tumors (radiosensitization). The high-Z nanoparticles (platinum, gold, gadolinium) are found to be good candidates. To develop new nanoagents and improve treatment planning, a deeper knowledge of the fundamental mechanisms is required. It was found that radiosensitizers enhance the lethal effect of radiations (fast ions and gamma rays). This is attributed to a multiscale cascade of events, which includes the NPs activation and relaxation, the production of water radicals up to the biological impact in mammalian cells. It is not clear yet what from the early stage processes or from the (eukaryotic) cell response is the key stage of the radiosensitization. Hence, the challenge of my thesis was to probe the effects of radiosensitizers (gold, platinum and gadolinium based nanoparticles) on cells other than eukaryotic cells. For the first time, their effect was tested on the most radioresistant bacterium ever reported Deinoccocus radiodurans (D. radiodurans). For comparison, the nanoparticles were tested on the radiosensitive bacterium E.coli. Additional studies at molecular scale were used to understand the elementary mechanisms. In summary, this work demonstrates that the radiosensitizing nanoparticles amplify the effects of -rays in radiosensitive and also radioresistant bacteria. This is attributed to the production of radical clusters and to the inducetion of nano-size biodamages in DNA but also in repair proteins. Finally, this work proves that the radiosensitization is a “universal” phenomenon that can take place in all living organisms. In other words, it tells that elementary mechanisms play a major role compared to the biological response of the cell. A set of standardized methods for evaluating the cellular uptake and the toxicity of the potential nanodrug was established throughout this study

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Alkan, Ufuk. « The effects of solar radiation, adsorption and sedimentation of the population of enteric bacteria in marine waters ». Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359000.

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PEREIRA, MARCO A. dos S. « Estudo da acao da radiacao gama de sup(60)Co sobre Salmonella poona, Escherichia coli e Alicyclobacillus Acidoterrestris em polpa de manga congelada ». reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9425.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Kminek, Gerhard. « The effect of ionizing radiation on amino acids and bacterial spores in different geo- and cosmochemical environments / ». Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2003. http://wwwlib.umi.com/cr/ucsd/fullcit?p3090438.

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BLAY, CLAUDIA C. « Analise comparativa da reducao bacteriana com irradiacao do laser Er:YAG ou ponta montada em alta rotacao apos remocao de tecido cariado em dentina : estudo in anima nobile ». reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10940.

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Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia)
IPEN/D-MPLO
Intituto de Pesquisas Energeticas e Nucleares, IPEN/CNEN-SP; Faculdade de Odontologia, Universidade de Sao Paulo

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BORRELY, SUELI I. « Reducao da toxidade aguda de efluentes industriais e domesticos tratados por irradiacao com feixe de eletrons, avaliada com as especies Vibrio fischeri, Daphnia similis e Poecilia reticulata ». reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10943.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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BOIANI, NATHALIA F. « Remoção da toxicidade do fármaco propranolol e de sua mistura com cloridrato de fluoxetina em solução aquosa empregando irradiação com feixe de elétrons ». reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/27140.

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A saúde do meio ambiente vem sendo comprometida devido ao descarte incorreto de produtos e seus subprodutos. Dentre os contaminantes emergentes encontram-se os fármacos, causadores de problemas ambientais por serem descartados no meio ambiente através dos efluentes. As técnicas convencionais de tratamento são insuficientes na remoção de diversos fármacos, por apresentarem resíduos resistentes e baixa biodegradabilidade. Sendo assim os processos oxidativos avançados vêm sendo estudados como alternativa para o tratamento de diferentes tipos de efluentes. O objetivo desse trabalho foi aplicar o processo de irradiação com feixe de elétrons para reduzir os efeitos tóxicos do propranolol, e de sua mistura com cloridrato de fluoxetina, em solução aquosa. Foram realizados ensaios ecotoxicológicos com o fármaco propranolol, e de sua mistura com o cloridrato de fluoxetina, utilizando como organismos-teste o microcrustáceo Daphnia similis, e a bactéria Vibrio fischeri. Observamos que o organismo D. similis mostrou-se mais sensível as amostras de fármacos quando comparado à bactéria V.fischeri. Após serem submetidas ao tratamento com radiação ionizante, todas as doses aplicadas para o propranolol e a mistura, mostraram significativa redução de toxicidade, tendo como organismo-teste D. similis. Para a bactéria V. fischeri apenas na dose de 5,0 kGy foi verificada a redução da toxicidade para o fármaco propranolol. Quanto à mistura dos fármacos, apenas as doses de 2,5 e 5,0 kGy apresentaram eficiência de remoção da toxicidade. A dose 5,0 kGy mostrou-se a melhor, apresentando redução de 79,94% para D. similis, e 15,64% para V. fischeri, quando expostas ao fármaco propranolol. Quanto à mistura, apresentou 81,59% e 26,93%, para D.similis e V.fischeri, respectivamente.
Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Almeida, Ana Rita Marques. « Combined effects of ultraviolet radiation and xenobiotics on zebrafish ». Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12624.

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Mestrado em Biologia Aplicada - Microbiologia Clínica e Ambiental
Nowadays, climate changes are an imperative problem and multiple measurements made in the last years showed an increase of all wavelengths of solar radiance, specially the Ultraviolet radiation. In their natural environment organisms are not only affected by biotic and environmental factors, but also by abiotic factors such as xenobiotics. Besides, these both stressors can interact with each other being their combined effect unpredictable (producing additive, synergistic or antagonistic effect). This work aims to studying the combined effect of UV radiation and three xenobiotics: triclosan, potassium dichromate and prochloraz on zebrafish embryos (Danio rerio). Effects were assessed at two levels: i) effects on embryos mortality and ii) effects in the natural bacterial communities of zebrafish embryos. The organisms were exposed to concentrations of each chemical combined with several UV doses. Embryo’ mortality, were observed daily for 96 hours post fertilization (hpf) and natural bacterial communities’ evaluation was performed at 48 hpf. Results showed that different combined effect may occur compromising organism’s survival. Combined exposure of UV radiation with TCS revealed a synergism pattern when the UV radiation is the dominant stressor while PD and PCZ revealed antagonism at low dose levels or when the UV radiation is dominant in the mixture. Zebrafish natural bacterial communities were also affected by UV radiation and chemicals with the change of their structure; however, conclusions about interactive effects were difficult to be drawn because effects were not always translated into changes in the diversity indexes.
Hoje em dia, as alterações climáticas são um problema imperativo e múltiplas medições feitas nos últimos anos mostram um aumento de toda a radiação solar, especialmente a radiação Ultravioleta que chega á superfície da terra afetando todos os organismos expostos. No seu ambiente natural, os organismos não estão apenas sujeitos a fatores bióticos, mas também a fatores ambientais e abióticos como por exemplo os xenobióticos. Além disso, ambos os stressores podem interagir uns com os outros produzindo efeitos imprevisíveis nos organismos (efeitos sinergísticos ou antagonísticos). O presente trabalho tem como objetivo a avaliação dos efeitos combinados da radiação UV e três xenobioticos (triclosan, dicromato de potássio e procloraz) em embriões de peixe zebra (Danio rerio). A avaliação foi feita a dois níveis: i) efeitos na mortalidade de embriões e ii) efeitos a nível das comunidades bacterianas naturais dos embriões. Os organismos foram expostos a várias concentrações de cada químico, combinadas com várias doses de UV. A mortalidade foi registada diariamente durante 96 horas e as comunidades bacterianas naturais foram avaliadas às 48 horas pós fertilização (hpf). Os resultados mostram que diferentes efeitos combinados foram observados, alterando a ecotoxicidade esperada. A exposição combinada da radiação UV com o TCS revelou um patrão sinergístico quando a radiação UV é o stressor dominante, enquanto que, na combinação UV com PD e PCZ observou-se antagonismo a doses baixas ou quando a radiação UV era dominante na mistura. As comunidades bacterianas naturais do peixe zebra também foram afetadas pela radiação UV e químicos, com alterações na sua estrutura. No entanto, foi difícil tirar conclusões relativamente a possíveis interações entre stressors visto que os efeitos observados nem sempre se traduziam em variações no índice de diversidade.

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Livres sur le sujet "Bacteria Effect of radiation on"

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Rados, Bill. Primer on radiation. [Rockville, MD] (5600 Fishers Lane, Rockville 20857) : [Dept. of Health and Human Services, Public Health Service, Food and Drug Administration, Office of Public Affairs, 1993.

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Rados, Bill. Primer on radiation. [Rockville, MD] (5600 Fishers Lane, Rockville 20857) : [Dept. of Health and Human Services, Public Health Service, Food and Drug Administration, Office of Public Affairs, 1993.

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Moss, K. J. Radiation around us. Richland, Wash : Westinghouse Hanford Co., 1990.

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David, Sumner. Radiation risks : An evaluation. 3^e éd. Glasgow : Tarragon, 1991.

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Sumner, David. Radiation risks : An evaluation. 4^e éd. Whithorn : Tarragon, 1994.

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Sumner, David. Radiation risks : An evaluation. Glasgow : Tarragon, 1988.

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David, Sumner. Radiation risks : An evaluation. 2^e éd. Glascow : Tarragon Press, 1988.

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Sumner, David. Radiation risks : An evaluation. 3^e éd. Glasgow : Tarragon, 1991.

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Radiation risks : An evaluation. Glasgow : Tarragon, 1987.

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Brustad, T. Radiation and cancer risk. New York : Hemisphere, 1990.

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Chapitres de livres sur le sujet "Bacteria Effect of radiation on"

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Jacobs, L. Janette, et George W. Sundin. « Analysis of the Effect of Ultraviolet-B Radiation on the Culturable Bacterial Community of Peanut ». Dans Plant Pathogenic Bacteria, 379–82. Dordrecht : Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0003-1_85.

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Džinić, M., et O. Nanušević. « Effects of Laser Radiation on Bacteria ». Dans Laser/Optoelectronics in Medicine/Laser/Optoelektronik in der Medizin, 184–87. Berlin, Heidelberg : Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70850-3_38.

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Weber, P. K. H., H. D. Menningmann et J. M. Greenberg. « Effect of High-Vacuum, Deep Temperatures and VUV Irradiation on Bacterial Spores ». Dans Terrestrial Space Radiation and Its Biological Effects, 383–91. Boston, MA : Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-1567-4_29.

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Wang, Yingzhao, et Yongxin Pan. « Ultraviolet-B Radiation Effects on the Community, Physiology, and Mineralization of Magnetotactic Bacteria ». Dans Stress and Environmental Regulation of Gene Expression and Adaptation in Bacteria, 532–44. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119004813.ch50.

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Herndl, G. J., et I. Obernosterer. « UV Radiation and Pelagic Bacteria ». Dans Ecological Studies, 245–59. Berlin, Heidelberg : Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-56075-0_12.

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Knowlton, Christin A., Michelle Kolton Mackay, Tod W. Speer, Robyn B. Vera, Douglas W. Arthur, David E. Wazer, Rachelle Lanciano et al. « Crossfire Effect ». Dans Encyclopedia of Radiation Oncology, 146. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-540-85516-3_671.

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Džinić, M., N. Nanušević et O. Nanušević. « Effects of Low Dose Laser Radiation on Bacterial Growth ». Dans LASER Optoelectronics in Medicine, 681–84. Berlin, Heidelberg : Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-72870-9_170.

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Smith, M. D., C. I. Masters et B. E. B. Moseley. « Molecular biology of radiation-resistant bacteria ». Dans Molecular Biology and Biotechnology of Extremophiles, 258–80. Dordrecht : Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2274-0_9.

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Kucharz, Eugene J. « Effect of Ionizing Radiation ». Dans The Collagens : Biochemistry and Pathophysiology, 283–85. Berlin, Heidelberg : Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-76197-3_23.

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Silva, Milena Fernandes da, Meire dos Santos Falcão de Lima et Attilio Converti. « Effect of Short-Chain Fatty Acids Produced by Probiotics ». Dans Lactic Acid Bacteria, 124–41. Boca Raton : CRC Press, Taylor & Francis Group, [2020] : CRC Press, 2020. http://dx.doi.org/10.1201/9780429422591-8.

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Actes de conférences sur le sujet "Bacteria Effect of radiation on"

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Sosnin, Edward A., Evgenia A. Kuznetsova, Sergei A. Avdeev, Larisa V. Lavrent'eva, Michael V. Erofeev, Alexei I. Suslov, Victor F. Tarasenko et Eva Stoffels. « A comparative study of atmospheric plasma and narrowband UV radiation effect on bacteria ». Dans SPIE Proceedings, sous la direction de Victor F. Tarasenko, Georgy Mayer et Gueorgii G. Petrash. SPIE, 2006. http://dx.doi.org/10.1117/12.677458.

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Jelinkova, Helena, Tatjana Dostalova, Jana Duskova, Mitsunobu Miyagi, Shigeru Shoji, Jan Sulc et Michal Nemec. « Er:YAG and alexandrite laser radiation propagation in the root canal and its effect on bacteria ». Dans BiOS '99 International Biomedical Optics Symposium, sous la direction de John D. B. Featherstone, Peter Rechmann et Daniel Fried. SPIE, 1999. http://dx.doi.org/10.1117/12.348345.

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Rodrigues, F. T., R. C. Duarte, G. B. Fanaro et A. L. C. H. Villavicencio. « Gamma radiation effects on bacteria and fungi in coffee (Coffea arabica L.) ». Dans Proceedings of the International Conference on Antimicrobial Research (ICAR2010). WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814354868_0045.

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Ushakova, Olga V., Anna V. Egorova, Grigory E. Brill, Irina O. Bugaeva, Dmitry E. Postnov et Andrey G. Melnikov. « Influence UHF radiation on the process of self-assembly and lethal effect of bacterial lipopolysaccharide ». Dans Saratov Fall Meeting 2017 : Fifth International Symposium on Optics and Biophotonics : Optical Technologies in Biophysics & Medicine XIX, sous la direction de Valery V. Tuchin, Dmitry E. Postnov, Elina A. Genina et Vladimir L. Derbov. SPIE, 2018. http://dx.doi.org/10.1117/12.2313310.

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Ashfaq, Mohammad Yousaf, Mohammad Al-Ghouti, Nabil Zouari et Hazim Qiblawey. « Development of Polymer Modified Graphene Oxide Nanocomposite Membranes to Reduce both Scaling and Biofouling ». Dans Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0064.

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In seawater reverse osmosis (SWRO), membrane scaling is one of the major issues affecting its widespread application in the desalination industry. In this research, the effect of concentration of calcium and sulfate ions from 20 to 150 mM and temperature from 5 to 35̊C on calcium sulfate scaling of reverse osmosis (RO) and Graphene oxide functionalized RO membranes was investigated. It was found that increase of concentration as well as temperature enhances the mineral scaling, where morphology of crystals varies from rod shaped to rosette structures. It was also observed that commonly found seawater bacteria can use antiscalants as an energy/carbon source thereby degrading them and reducing their efficiency to reduce mineral scaling. Moreover, bacteria were found to be capable of inducing/mediating calcium sulfate precipitation on RO membranes, further enhancing the mineral scaling. Therefore, it was important to modify RO membranes capable of simultaneously reduce both mineral scaling and biofouling. For this purpose, RO membrane was modified with antibacterial graphene oxide and polymer antiscalants using microwave radiation technique. It was found that the modified membranes were able to inhibit microbial growth up to 95%, while, mineral scaling was also reduced by 97%. Hence, it was concluded that the coating of polymer modified graphene oxide nanocomposites on RO membranes can simultaneously reduce both biofouling and scaling. So far, such dual characteristics of modified membranes have not been reported in the literature.

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Suponkina, Anna, Michael Zhukovsky, Anna Krivonogova, Kseniya Shcherbakova et Kseniya Moiseeva. « RADIATION SENSITIVITY OF BACTERIA CONTAMINATING FOOD ». Dans RAD Conference. RAD Association, 2016. http://dx.doi.org/10.21175/radproc.2016.01.

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Shibai, Atsushi, Saburo Tsuru, Bei-Wen Ying, Daisuke Motooka, Kazuyoshi Gotoh, Shota Nakamura et Tetsuya Yomo. « Mutation Accumulation in Bacteria Exposed to UV Radiation ». Dans Artificial Life 14 : International Conference on the Synthesis and Simulation of Living Systems. The MIT Press, 2014. http://dx.doi.org/10.7551/978-0-262-32621-6-ch121.

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Ram, Gopi, P. Chakravorty, Durbadal Mandal, Rajib Kar, Sakti Prasad Ghoshal et S. Banerjee. « Radiation pattern synthesis of TMCAA using bacteria foraging optimization ». Dans 2015 IEEE International WIE Conference on Electrical and Computer Engineering (WIECON-ECE). IEEE, 2015. http://dx.doi.org/10.1109/wiecon-ece.2015.7443948.

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Snevajsova, P., J. Vytrasova et J. Remesova. « Effect of oxidized cellulose on probiotic bacteria ». Dans Proceedings of the III International Conference on Environmental, Industrial and Applied Microbiology (BioMicroWorld2009). WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814322119_0068.

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KASHEFIPOUR, SEYED M., B. LIN et R. A. FALCONER. « DYNAMIC MODELLING OF BACTERIAL CONCENTRATIONS IN COASTAL WATERS : EFFECTS OF SOLAR RADIATION ON DECAY ». Dans Proceedings of the 13th IAHRߝ;APD Congress. World Scientific Publishing Company, 2002. http://dx.doi.org/10.1142/9789812776969_0183.

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Rapports d'organisations sur le sujet "Bacteria Effect of radiation on"

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Kincaid, B. M. Long wavelength end-effect undulator radiation (Transition Undulator Radiation). Office of Scientific and Technical Information (OSTI), janvier 1996. http://dx.doi.org/10.2172/210925.

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Dunifon, R. E., et T. C. Hazen. The effect of vacuum pump oil on the chemotactic behavior of soil bacteria. Office of Scientific and Technical Information (OSTI), janvier 1990. http://dx.doi.org/10.2172/6423307.

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Raubenheimer, T. Coherent Synchrotron Radiation effect in damping rings. Office of Scientific and Technical Information (OSTI), janvier 2004. http://dx.doi.org/10.2172/826687.

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Wilde, E. W., J. C. Radway, T. C. Hazen et P. Hermann. Immobilization of degradative bacteria in polyurethane-based foams : embedding efficiency and effect on bacterial activity. Office of Scientific and Technical Information (OSTI), septembre 1996. http://dx.doi.org/10.2172/565240.

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Rees, Brian G. Ship Effect- Issues with Radiation Detection Aboard Ships. Office of Scientific and Technical Information (OSTI), janvier 2018. http://dx.doi.org/10.2172/1418784.

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S. Utsunomiya et R.C. Ewing. THE EFFECT OF IONIZING RADIATION ON U6+ -PHASES. Office of Scientific and Technical Information (OSTI), juillet 2005. http://dx.doi.org/10.2172/859403.

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Thurston, Alison, Zoe Courville, Lauren Farnsworth, Ross Lieblappen, Shelby Rosten, John Fegyveresi, Stacy Doherty, Robert Jones et Robyn Barbato. Microscale dynamics between dust and microorganisms in alpine snowpack. Engineer Research and Development Center (U.S.), mars 2021. http://dx.doi.org/10.21079/11681/40079.

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Dust particles carry microbial and chemical signatures from source regions to deposition regions. Dust and its occupying microorganisms are incorporated into, and can alter, snowpack physical properties including snow structure and resultant radiative and mechanical properties that in turn affect larger-scale properties, including surrounding hydrology and maneuverability. Microorganisms attached to deposited dust maintain genetic evidence of source substrates and can be potentially used as bio-sensors. The objective of this study was to investigate the impact of dust-associated microbial deposition on snowpack and microstructure. As part of this effort, we characterized the microbial communities deposited through dust transport, examined dust provenance, and identified the microscale location and fate of dust within a changing snow matrix. We found dust characteristics varied with deposition event and that dust particles were generally embedded in the snow grains, with a small fraction of the dust particles residing on the exterior of the snow matrix. Dust deposition appears to retard expected late season snow grain growth. Both bacteria and fungi were identified in the collected snow samples.

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Cramer, S. N., B. L. Kirk et J. Broadway. The effect of coherent scattering in photon radiation transport calculations. Office of Scientific and Technical Information (OSTI), avril 1989. http://dx.doi.org/10.2172/6281410.

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Hayward, Jason P. Glasses for Detection of Penetrating Radiation via the Cherenkov Effect. Fort Belvoir, VA : Defense Technical Information Center, juillet 2015. http://dx.doi.org/10.21236/ada623523.

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Oona, H., D. L. Peterson et J. H. Goforth. Instabilities in foil implosions and the effect of radiation output. Office of Scientific and Technical Information (OSTI), août 1995. http://dx.doi.org/10.2172/100185.

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