Potencial de leveduras isoladas do solo e do filoplano de plantas cítricas no biocontrole de doenças de pós-colheito de citros

Pós-graduação em Microbiologia Agropecuária - FCAV

Estudo dos mecanismos de ação de leveduras envolvidos no biocontrole de doenças de pós-colheita em citros

Pós-graduação em Microbiologia Agropecuária - FCAV

Análise da susceptibilidade de leveduras isoladas de insetos sociais aos antifúngicos

A frequência de micoses invasivas causadas por fungos oportunistas, incluindo leveduriformes, vem aumentando significativamente nas últimas décadas e atinge principalmente indivíduos imunocomprometidos. A tribo Attini possui cerca de 230 espécies de formigas e todas possuem o hábito de cultivar e se alimentar de fungos. Algumas espécies cultivam o fungo mutualista em nódulos poligonais sólidos com 0,25 a 0,50mm de diâmetro, aproximadamente. No interior desses nódulos, encontram-se células na forma de leveduras, que quando semeadas em meio de cultura se desenvolvem como fungo filamentoso. Este tipo de fungicultura está restrito a algumas espécies do gênero Cyphomyrmex. Neste trabalho, isolamos 30 leveduras dos nódulos de oito ninhos de Cyphomyrmex transversus da região de Ilhéus (BA), e analisamos a susceptibilidade aos seguintes antifúngicos: Anfotericina B (AMB), Fluconazol (FCZ), Voriconazol (VCZ) e Itraconazol (ITZ). A caracterização das estirpes foi feita através de métodos morfológicos e moleculares, incluindo-se o sequenciamento dos domínios D1/D2 do rDNA. A avaliação da atividade antifúngica foi realizada através do método de microdiluição, de acordo com a norma M27-A2 (CLSI, 2002). Candida parapsilosis ATCC 22019 e Candida krusei ATCC 6258 foram utilizadas como controle. Os resultados foram interpretados segundo os pontos de corte (breakpoints) aplicados ao gênero Candida. As estirpes foram identificadas como Trichosporon asahii (18), T. coremiiforme (4), Candida carpophila (syn. C. guilliermondii) (4), Galactomyces candidum (syn. Geotrichum candidum) (3) e Cryptococcus laurentii (1). Todas as espécies são conhecidas por possuírem representantes que já foram relatados como patógenos oportunistas. Elas foram sensíveis aos azóis FCZ, VCZ e ITZ, com exceção de G. candidus, cujas estirpes apresentaram sensibilidade dose-dependente a FCZ e ITZ... (Resumo completo, clicar acesso eletrônico abaixo)

Production of volatile compounds by Geotrichum fragrans using cassava wastewater as substrate

The cassava processing industry generates wastewater named manipueira with a high organic content. Although considered a pollutant, manipueira can be used as substrate for fermentative processes including the cultivation of Geotrichum fragrans. This aerobic microorganism isolated from cassava wastewater has cyanide resistant respiration. Under cassava wastewater cultivation, G. fragrans produced fruit aroma volatile compounds. This study evaluated volatile compounds produced by G. fragrans in cassava liquid waste. The waste had a sugar composition composed of dextrin (2.6%), maltose (1.4%), sucrose (32.1%), glucose (38.3%), and fructose (25.6%). The average value of total sugars was 58.2 g l(-1), composed of 38.0 g l(-1) reducing and 20.2 g l(-1) non-reducing sugars. The chemical oxygen demand (COD) average value was 60 000 mg l(-1). G. fragrans used sugars (fructose and glucose) for energy generation reducing the COD value of the cassava wastewater by 40%. Biomass production of G. fragrans cultivated for 12 h in natural cassava liquid waste was 12.8 g l(-)1. The volatile compounds identified in the cassava liquid waste after 72 h cultivation were: 1-butanol, 3-methyl 1-butanol (isoamylic alcohol), 2-methyl 1-butanol, 1-3 butanodiol and phenylethanol; ethyl acetate, ethyl propionate, 2-methyl ethyl propionate and 2-methyl propanoic. The effect of substrate supplementation with glucose (50 g l(-1)), fructose (50 g l(-1)) and aqueous yeast extract (200 ml l(-1)) did not affect the qualitative and quantitative profiles of volatile compounds. These results indicate that the carbon (C) source utilized by microorganism was glucose or fructose, while nitrogen (N) supplementation was not necessary because the agent did not exhaust all the nitrogen of the wastewater. (C) 2003 Elsevier B.V. Ltd. All rights reserved.

Species diversity of yeast in oral colonization of insulin-treated diabetes mellitus patients

The aim of this study was to investigate oral yeast colonization, antifungal susceptibility and strain diversity in insulin-dependent diabetes mellitus patients (175), as well as to evaluate the influence of dental prostheses. Oral rinse samples were cultured on selective media, in order to isolate, count and identify the yeasts recovered. More than half of the diabetic subjects (53%) carried significant amounts of Candida cells in the buccal cavity and these organisms were recovered at higher densities in diabetics wearing dentures. A total of 93 yeast strains were isolated from these patients, including: Candida spp. (n = 89); Pichia (n = 02); Trichosporon (n = 1), and Geotrichum (n = 1). C. albicans represented 56% of these strains, non-albicans Candida 39.8%, and other genera of yeast 4.3%. C. albicans was prevalent, followed by C. parapsilosis, C. tropicalis, C. glabrata, C. krusei, C. rugosa and C. guilliermondii. Agar disk-diffusion tests of the susceptibility of non-albicans Candida and other genera of yeast to fluconazole showed resistance in 21.9%, mainly in C. rugosa (100%), C. glabrata (57%) and C. krusei (50%). Local oral factors, such as the presence of dentures, in association with diabetes, seemed to have the effect of increasing the amount and variety of Candida species in the oral cavities, mainly those with lower drug susceptibilities.

Lipase and esterase: to what extent can this classification be applied accurately?

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Aspectos físico-químicos e microbianos do queijo maturado por mofo obtido da coagulação mista com leite de cabra congelado e coalhada congelada

Milk goats are indicated as an economic alternative for small farmers and cheese making could improve their profits. Goat's milk has a seasonal production characteristic and shows periods of abundance and others of scarcity. The use of frozen milk or frozen curd to make cheese can be used to solve the problem. The aim of this work was to evaluate the preparation of cheese made from mixed curd and ripened by Penicillium candidum mould using slow frozen milk (in a domestic freezer) or fast frozen milk (by liquid nitrogen). The slow frozen curd and fast frozen curd without whey were used. It was observed that the cheese from the slow and fast frozen milk and from the slow and fast frozen curd did not differ from the control cheese for the yield, chemicophysical characteristics, chemical composition, extention ripened rate, depth ripened rate and microbiological aspects, even when it was expressed as a dry matter content of cheeses.

Diversidade de geofungos em águas do Parque Municipal do Ibirapuera na cidade de São Paulo, SP, Brasil

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Elaboração de queijo maturado por mofo obtido de coagulação mista (Lática-Coalho), com leite de cabra congelado e coalhada congelada

Pós-graduação em Medicina Veterinária - FMVZ

Microbiota fúngica de passeriformes de cativeiros da Região Noroeste do Estado de São Paulo

Birds are hosts for a rich fungal microbiota which can act as potent pathogens for humans and other species of animals, causing thereby serious public health problems. The objective of this study was to evaluate the participation of birds kept in containers in the epidemiology of infectious diseases such as cryptococcosis and aspergillosis, thus verifying the maintenance and spread of pathogens in the environment. 36 samples of excretas of passeriformes were collected and were cultivated in Sabouraud Dextrose Agar 4% at room temperature and 37°C. The isolated fungal colonies were classified according to their morphological and staining characteristics. Subsequently, those in yeast form were peaked in Niger Agar, incubated at 30°C. In one sample showed growth of more than one type of colony and there was verified the presence of 25.0% of Penicillium spp., 19.4% of Trichosporon spp., 13.9% of C. gattii, 11.1% of C. neoformans, 11.1% of Candida spp., 8.3% of Rhizomucor spp., 8.3% of Aspergillus spp., 2.8% of Nigrospora spp. and 2,8% of Geotrichum spp. It can be conluded by the expost that birds shed continuously pathogenic microorganisms in their feces acting in definitive form in the infectious diseases ecoepidemiology.