Avaliação de sementes de milheto no cultivo de Trichoderma spp.

bitstream/CENARGEN/29566/1/ct056.pd

Resistante to mercury of endophytic bacteria obtained in contaminated sites.

Strategies for remediation of soils contaminated with mercury (Hg) are important and necessary. Several bacterial species interfere with biogeochemical cycle of mercury and are potential tools in bioremediation and/or phytoremediation programs. These bacteria are resistant to mercury and the main mechanism of resistance is mediated by proteins codificated by operon mer. This study aims to determine the level of resistance to mercury of endophytic bacteria and detect the presence of merA gene

Endophytic bacterium isolated of hosts present in contaminated areas by mercury in Pantanal mato-grossense.

The mercury is a contaminant in gold mining in the city of Poconé. This heavy metal is a toxic in different organisms and affect the human by bioaccumulation process causing a serie of cronic diseases. Mercury can be easily absorbed by plants and be accumulated in the human body through the food chain. The hypothesis is microorganism that is in association with plants, that survive in contaminated areas with mercury, provide greater resistance to contaminant and possibly an increased frequency of colonization. In this way, the aim of this study was to isolate endophytic bacterium that exhibit resistance to mercury

Simulating nearly edge-on sloshing in the galaxy cluster Abell 2199

Off-axis collisions between galaxy clusters may induce the phenomenon of sloshing, causing dense gas to be dragged from the cool core of a cluster, resulting in a spiral of enhanced X-ray emission. Abell 2199 displays signatures of sloshing in its core and it is possible that the orbital plane of the collision is seen nearly edge-on. We aim to evaluate whether the features of Abell 2199 can be explained by a sloshing spiral seen under a large inclination angle. To address this, we perform tailored hydrodynamical $N$-body simulations of a non-frontal collision with a galaxy group of $M_{200}=1.6\times10^{13}\,{\rm M_{\odot}}$. We obtain a suitable scenario in which the group passed by the main cluster core 0.8 Gyr ago, with a pericentric separation of 292 kpc. Good agreement is obtained from the temperature maps as well as the residuals from a $\beta$-model fit to the simulated X-ray emission. We find that under an inclination of $i=70^{\circ}$ the simulation results remain consistent with the observations.Comment: 13 pages, 14 figures, accepted for publication in MNRAS; replaced Fig.

Oviposicao e eclosao de Stiphra robusta Mello-Leitao, 1939 (Ortoptera, Proscopiidae) no Tropico Semi-Árido do Brasil.

Stiphra robusta e uma praga que causa severos danos a muitas das especies florestais nativas e exoticas na regiao do tropico Semi-Arido do Brasil. Sua biologia ainda nao foi estudada em todos os aspectos, particularmente no que diz respeito a reproducao. Com o objetivo de se obter maiores informacoes sobre a oviposicao e eclosao das ninfas de S robusta, conduziu-se este estudo em condicoes de campo. Vefiricou-se que a oviposicao ocorreu 4 a 5 cm abaixo da superficie do solo em inicio de abril, no final do periodo chuvoso, e a eclosao de ninfas em meados de novembro e dezembro, logo apos as primeiras chuvas, o que sugere estar este fenomeno associado a ocorrencia de chuvas. O numero de ovos postos, por femea, variou de 77 a 102 e o periodo de incubacao variou de 220 a 241 dias

Isolation of endophytic fungi in environments with and without traces of mercury contamination, Pantanal of Mato Grosso.

The mining activity in Mato Grosso is an economic source for many cities, especially in Poconé, where this activity is responsible for significant change in the landscape and the contamination of the ecosystem by mercury. This results in serious damage to biota enhanced by bioaccumulation capacity. Mercury is toxic to all organisms, however, some microorganisms have innate or acquired tolerance to metal. Therefore, our hypothesis is based on the premise that plants in contaminated environments with mercury harbor a specific community of endophytic fungi, therefore, variations in the colonization frequency of the endophytes in these plants are expected, when compared to places without contamination

Antibiosis of actinomycetes from Paullina cupana var. sorbilis (mart.) Ducke against fungi pathogenic.

Guarana (Paullinia cupana var. Sorbilis (Mart.) Ducke) is a native species of economic and social importance in Brazil serving the domestic and international demands. This culture is attacked by Colletotrichum guaranicola Albuq. and Fusarium decencellulare Brick, causal agents of anthracnose and overbudding, respectively. Actinomycetes are bacteria that may produce secondary metabolites with antibacterial and antifungal potential. The isolation of endophytic with antibiosis agaist pathogenic fungi is the first step in biological control and bioprospecting antimicrobial compounds programs

Capacity resistance of endophytic fungi the mercury.

Contamination of biological systems by mercury represents a global concern, given the difficulty of degradation, persistence and potential toxicity of this metal in the environment. Remediation strategies of soils contaminated with mercury are required and the use of microorganisms as bioremediation agents is fully justified, in particular, the various mechanisms of tolerance to heavy metals allocated to them, particularly for fungi arising from various chemical processes, such as transformation valence, intra and extracellular precipitation and oxidation. Our hypothesis is that endophytic fungi isolated from areas contaminated by mercury present higher resistance to this metal

Microbiol diversity in rhizosphere resistant and susceptible guarana collected in Maués and Manaus.

The rhizosphere is the soil region subject to influence of exudates released by plants and microorganisms (epiphytic and endophytic). In addition, this region has large variety of bacteria that can contribute to plant growth and/or inhibiting the activity of plant pathogens. The culture of guarana (Paullinia cupana var. Sorbilis (Mart.) Ducke) is threatened by the presence of the fungus Colletotrichum guaranicola Albuq. and Fusarium decencellulare Brick, causal agents of anthracnose and overbudding, respectively. In this work, the metabolic diversity of rhizospheric bacteria was studied in resistant (R) and susceptible (S) clones collected in Manaus (Mn) and Maués (Mu)