Search results for "Bacillus"
showing 10 items of 774 documents
Hydrolytic enzyme activity of Paenibacillus sp. strain B2 and effects of the antagonistic bacterium on cell integrity of two soil-borne pathogenic fu…
2000
Paenibacillus sp. strain B2, isolated from the mycorrhizosphere of Sorghum bicolor and having an antagonistic activity towards soil-borne fungal pathogens, possessed extracellular cellulolytic, proteolytic, chitinolytic and pectinolytic enzyme activities. The eventual role of these lytic enzymes in cellular interactions between Paenibacillus sp. strain B2 and Phytophthora parasitica and Fusariumoxysporum was investigated by electron microscopy and molecular cytology. Electron microscopic observations showed that the presence of Paenibacillus sp. strain B2 resulted in disorganisation of cell walls and/or cell contents of P. parasitica and F. oxysporum. However, when P. parasitica was treated…
Biosorpcja ołowiu (II), cynku (II) i niklu (II) za ścieków przemysłowych przez Stenotrophomonas maltophilia i Bacillus subtilis
2013
Działanie pelargoniowego olejku eterycznego na Bacillus spp.
2018
Pelargonia pachnąca (Pelargonium graveolens) jest aromatycznym krzewem posiadającym jasnozielone, owłosione, miękkie w dotyku, karbowane liście i małe, różowe kwiaty. Należy do rodzaju Pelargonium (Geraniaceae) i liczy ponad 250 gatunków. Olejek eteryczny pozyskiwany z pelargonii jest bardzo ceniony nie tylko przez przemysł perfumeryjny czy aromaterapię, ale także przez przemysł spożywczy, kosmetyczny jak i farmację. Roczną produkcję olejku szacuje się na 300 ton. Liczne badania wskazują na jego silne właściwości przeciwbakteryjne, przeciwwirusowe, przeciwbólowe czy przeciwzapalne. Celem przeprowadzonych badań było określenie aktywności olejku pelargoniowego wobec Bacillus spp. Zebrano jedn…
Studies on the insecticidal mechanism of Bacillus thuringiensis Vip3A and Cry proteins
2022
El control de plagas y patógenos ha tenido un efecto importante en la mejora del rendimiento de los sistemas agrícolas a nivel mundial. Diferentes tipos de insecticidas químicos se han usado extensivamente durante mucho tiempo para el control de plagas de insectos. Debido a la aparición de resistencias, problemas de contaminación de aguas y problemas de salud humana causados por dichos insecticidas de síntesis, la agricultura moderna necesita una estrategia de gestión integrada de plagas más saludable, respetuosa con el medio ambiente y sostenible. El uso de Bacillus thuringiensis (Bt) y sus proteínas insecticidas para el control de plagas es una de las estrategias biotecnológicas más impor…
Síntesis de fucosil-oligosacáridos, evaluación de sus propiedades bioactivas y caracterización de sus rutas metabólicas en Lactobacillus
2016
Los fucosil-oligosacáridos (FUS) son carbohidratos que contienen fucosa y constituyen más del 50% de los oligosacáridos libres presentes en la leche humana, sin embargo su función fisiológica es mayormente desconocida. Los FUS forman parte también de muchos glico-complejos presentes en las mucosas y en la superficie de células eucariotas. Se ha evidenciado que las características estructurales que presentan estos carbohidratos se relacionan con funciones biológicas importantes, entre las cuales destacan el efecto prebiótico y la actividad anti-adhesiva contra patógenos intestinales. A pesar de que la participación de los FUS en muchas funciones biológicas es esencial, éstos permanecen relat…
Challenges Associated with Byproducts Valorization—Comparison Study of Safety Parameters of Ultrasonicated and Fermented Plant-Based Byproducts
2020
In order to promote the efficient use of byproducts from the production of plant-based beverages, which still contain a large amount of nutritional and functional compounds, microbiological and chemical safety characteristics should be evaluated and, if needed, improved. Many challenges are associated with byproducts valorization, and the most important ones, which should be taken into account at the further steps of valorization, are biological and chemical safety. For safety improving, several technological treatments (biological, physical etc.) can be used. In this study, the influence of low-frequency ultrasonication (US) and fermentation with Lactobacillus casei LUHS210 strain, as phys…
LACTOBACILLI IN SOURDOUGH FERMENTATION: A REVIEW
2007
Sourdough technology is widely used; it is employed in bread making and for the production of cakes. Sourdough is characterized by a complex microbial ecosystem, mainly represented by lactic acid bacteria and yeasts, whose fermentation confers to the resulting bread its characteristic features such as palatability and high sensory quality. Investigation of the microbial composition of sourdough is relevant in order to determine the potential activities of sourdough microorganisms. This review focuses on the role of the most important group of sourdough fermenting bacteria that consists of lactobacilli; species that belong to the Lactobacillus genus are the main responsible of flavor develop…
Potential effects of transgenic cotton on soil ecosystem processes in Vietnam.
2008
This chapter concentrates on the potential effects of transgenic cotton on the soil ecosystem of three major cotton growing areas in Vietnam: the coastal lowlands region, the central highlands (eastern and western Truong Son Mountain Range) and the south-eastern region. Soils in these three regions are very different, so it will be necessary to assess the effects of transgenic cotton on typical soils from all three regions. The soils in the south-eastern region are Luvisols, Andosols and Acrisols. In the central highlands, the soils are mainly Luvisols, Rhodic Ferrasols and Haplic Acrisols. The soils in the coastal lowlands region are mainly delta soils, consolidated occasionally by grey li…
Drying process strongly affects probiotics viability and functionalities
2015
International audience; Probiotic formulations are widely used and are proposed to have a variety of beneficial effects, depending on the probiotic strains present in the product. The impact of drying processes on the viability of probiotics is well documented. However, the impact of these processes on probiotics functionality remains unclear. In this work, we investigated variations in seven different bacterial markers after various desiccation processes. Markers were composed of four different viability evaluation (combining two growth abilities and two cytometric measurements) and in three in vitro functionalities: stimulation of IL-10 and IL-12 production by PBMCs (immunomodulation) and…
Factors affecting the production of putrescine from agmatine by Lactobacillus hilgardii X1B isolated from wine
2008
Aims: To elucidate and characterize the metabolic putrescine synthesis pathway from agmatine by Lactobacillus hilgardii X1B. Methods and Results: The putrescine formation from agmatine by resting cells (the normal physiological state in wine) of lactic acid bacteria isolated from wine has been determined for the first time. Agmatine deiminase and N-carbamoylputrescine hydrolase enzymes, determined by HPLC and LC-Ion Trap Mass Spectrometry, carried out the putrescine synthesis from agmatine. The influence of pH, temperature, organic acids, amino acids, sugars and ethanol on the putrescine formation in wine was determined. Conclusions: Resting cells of Lact. hilgardii X 1B produce putrescine …