Search results for "bacteri"
showing 10 items of 5466 documents
Influence of citrates nanoparticles on morphological traits of bacterial cells pseudomonas syringae pv. atrofaciens
2020
Electron microscope investigations have revealed disintegration of the cell wall of Pseudomonas syringae pv. atrofaciens and subsequent killing of bacterial cells after application of 1% solutions of the citrates of Ag-Cu nanoparticles, the complex Co-Cu-Zn-Fe-Mn-Mo-Mg (Avatar-1) and iodine-selenium. In field conditions, it was revealed that pre-sowing treatment of wheat seeds with the aforementioned 1% solutions significantly inhibited the development of basal glume rot in cereals with artificial infection of Pseudomonas syringae рv. аtrofaciens. Consequently, reduction of the typical symptoms of basal glume rot of cereals and the percentage of isolated cells of Pseudomonas syringae рv. аt…
Identification of phytopathogenic bacteria in maize seeds in Ukraine
2018
The main bacterial diseases of maize: bacterial wilt of maize (Pantoea stewartii subsp. stewartii), goss’s bacterial wilt (Clavibacter michiganensis subsp. nebraskensis), seed rot-seedling blight of maize (Bacillus subtilis), bacterial spot of maize (Pseudomonas syringae pv. syringae), bacterial leaf spot of maize (Pantoea agglomerans) and bacterial stalk rot of maize caused by several causative agents, were described. The causative agents of these diseases are often stored and transmitted with seeds, so seed analysis for the presence of phytopathogenic bacteria is an important step in the pathogen control system. For analysis, the corn seeds that were grown in the Poltava and Kiev regions …
Stochastic model for a biological complex system: analysis of the bacterial growth in food products
2012
The Physics of Complex Systems has recently taken a more and more important role in the description of natural systems because of the interactions, both deterministic and noisy, between such systems and the environment. In particular the noise plays a relevant role in biological systems, whose dynamics is strongly influenced by environmental variables subject to random fluctuations. In this work a stochastic model is exploited to reproduce the growth of bacteria in food of animal origin. Specifically the dynamics of a bacterial species, Listeria monocytogenes, is analyzed in the presence of lactic acid bacteria (LAB) during the period of the fermentation of meat products. The model, based o…
Borrelia burgdorferi Outer Membrane Vesicles Contain Antigenic Proteins, but Do Not Induce Cell Death in Human Cells
2022
Like many bacterial species, Borrelia burgdorferi, the pleomorphic bacterium that causes Lyme borreliosis, produces outer membrane vesicles (OMVs). Borrelial OMVs (BbOMVs) have been identified as containing virulence factors, such as outer surface proteins (Osps) A, B, and C, as well as DNA. However, the pathogenicity of BbOMVs in disease development is still unclear. In this study, we characterized purified BbOMVs by analyzing their size and immunolabeling for known antigenic markers: OspA, OspC, p39, and peptidoglycan. In addition, BbOMVs were cocultured with human non-immune cells for cytotoxicity analysis. The results demonstrated that, on average, the vesicles were small, ranging betwe…
Ekstracelulārās vezikulās ietvertās mikrobiālās RNS atklāšana cilvēku asins un urīna paraugos
2020
Gandrīz visi cilvēka šūnu tipi sekretē ekstracelulārās vezikulas (EVs), un tām ir svarīga loma starpšūnu komunikācijā. Jaunākie pētījumi liecina, ka komunikācija notiek arī starp cilvēka mikrobiotu un saimniekorganisma šūnām. Šajā pētījumā mēs parādām, ka no cilvēka asinīm un urīna izdalītās EVs satur RNS fragmentus no dažādiem mikroorganismiem. Visbiežāk sastopami baktēriju tipi un supertipi asinīs un urīnā bija Proteobacteria, PVC grupa un Terrabacteria. Lai noteiktu vai šo mikrobiālo transkriptu galvenais avots ir zarnu mikrobioms, mēs izstrādājām EV izdalīšanas metodi no cilvēku fēču paraugiem. Tālāk mēs plānojām veikt RNS sekvencēšanas (RNA-seq) analīzi EV, kas izdalītas no plazmas, ur…
Bacterial and chemical indicator of coastal water pollution.
1993
This study has been carried out to compare the presence of some organic compounds of long environmental persistance (OCLEP) and heavy metals, in sea water samples, with faecal pollution indicators. Along the Sicily coast line three sites with different grade of pollution (urban, agricultural, industrial) were sampled. 69 samples were obtained from October 1987 to May 1990. Only indicators of faecal pollution were found linked to human settlements, while the other investigated anthropogenic activity related substances were found independently from sampling area.
Characterization of bacterial community in indoor environment
2006
We report the presence of bacterial colonization in library environment and on the books housed, performing morphological and bacterial molecular analyses. Isolated bacterial colonies were characterised by 16S rRNA locus and ITS (16S-23S rRNA Intergenic Transcribed Spacer) amplification and sequencing. The results of SEM observation and molecular analysis showed the prevalent presence of bacteria belonging to the family Micrococcaceae. We distinguished Kocuria rosea, Arthrobacter nicotianae, Micrococcus luteus and Curtobacterium flaccumfaciens which shows high cellulolytic activity.
Type IV pili and their role in virulence in Vibrio vulnificus
2021
Las bacterias del género Vibrio, compuesto por mas de 100 especies, están presentes en la gran mayoría de los ecosistemas acuáticos alrededor del mundo. Estas bacterias son gram-negativas, aeróbicas y anaeróbicas facultativas, y cuentan con al menos un flagelo polar. Se pueden encontrar tanto como un organismo de vida libre en el agua, como habitando superficies bióticas y abióticas en forma de agregaciones inmóviles llamadas biofilms. Una gran cantidad de especies pertenecientes a este género son patógenas para los humanos, dentro de las cuales, las tres más importantes son, V. cholerae, V. parahaemolyticus, y V. vulnificus, debido a su elevada tasa de incidencia y gravedad de las infeccio…
Dextranos de bacterias lácticas aisladas de productos cárnicos: caracterización y aplicaciones
2015
153 p.-46 fig.-9 tab.-2 anexos
Estudio de las resistencias a los antimicrobianos de bacterias zoonóticas y comensales aisladas en alimentos de la provincia de Valencia
2022
Las enfermedades transmitidas por los alimentos constituyen un problema de salud pública creciente en todo el mundo. Dentro de este amplio espectro de enfermedades que pueden ser causadas por la ingesta de alimentos contaminados, las toxiinfecciones alimentarias son aquellas enfermedades que, además de ser transmitidas por los alimentos, son causadas por agentes biológicos o sus toxinas, y suponen uno de los peligros más importantes asociados al consumo de alimentos. Los costes sociales y económicos de estas enfermedades son difíciles de evaluar, ya que implican no sólo costes médicos de tratamiento y hospitalización y jornadas de trabajo perdidas, sino también, en muchos casos, daños irrev…