Microbial Transformations
Mostrando 1-12 de 55 artigos, teses e dissertações.
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1. Aspergillus niger: A Hundred Years of Contribution to the Natural Products Chemistry
Aspergillus niger is a phytopathogenic fungus responsible for the plant disease called “black mold”, and it is considered the most versatile microorganism for producing acids, proteins, and enzymes of industrial value, besides a variety of compounds of pharmacological interest. This review presents a century of contribution of A. niger in the natural pro
J. Braz. Chem. Soc.. Publicado em: 21/10/2019
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2. Soil phosphorus dynamics as affected by Congo grass and P fertilizer
Some plant species can change soil phosphorus (P) availability and this may be an important tool in managing tropical high fixing phosphorus soils. An experiment was conducted to evaluate phosphorus transformations in the soil and phosphatase activity during periods of Congo grass (Brachiaria ruziziensis, Germain et Evrard) growth in two tropical soils recei
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-08
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3. Evaluation of poultry litter traditional composting process
The objective of this work was to study the poultry litter composting and evaluate the physico-chemical and microbiological transformations as a time-function. At the end of composting, an increase of humification matter, a decrease of microbial diversity and the elimination of pathogens were observed. Results showed that poultry litter was liable of compost
Brazilian Archives of Biology and Technology. Publicado em: 2011-10
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4. Thymol and carvacrol: biotransformation and antifungal activity against the plant pathogenic fungi Colletotrichum acutatum and Botryodiplodia theobromae
Fungal growth in fruits may cause spoilage and result in a reduction of their quality and quantity. The aim of the current study was to investigate the antifungal activity and the metabolism of thymol and carvacrol by Colletotrichum acutatum and Botryodiplodia theobromae. The results showed that both compounds provided relatively good control against these p
Tropical Plant Pathology. Publicado em: 2011-02
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5. Transformações microbianas da lactona sesquiterpênica tagitinina C / Microbial transformation of sesquiterpene lactone tagitinin C
A busca por moléculas de origem natural que ocupem um espaço químico diferente daquelas já existentes tornou-se uma necessidade para atender às novas demandas das indústrias farmacêuticas. A pesquisa envolvendo transformações microbianas de metabólitos secundários de origem vegetal pode ser utilizada como uma nova ferramenta na biosíntese destas
Publicado em: 2009
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6. Nitrogen transformations in soil-plant system after herbicide application / Transformações do nitrogênio no sistema solo-planta após aplicação de herbicidas
Herbicide adoption might modify nitrogen dynamics in agroecossystems and, for consequence, nutrient availability for plants and microorganisms. These modifications may occur because of plant physiologic changes and/or due to herbicide effects on activity and composition of soil microbial community, which has important functions on system N modifications. In
Publicado em: 2009
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7. Microbial Transformations and cytotoxic evaluation of sesquiterpene lactones from Viguiera robusta Gardn. (Asteraceae). / Transformações microbianas e avaliação da citotoxicidade de lactonas sesquiterpênicas de Viguiera robustaGardn. (Asteraceae)
The microbial transformation of secondary metabolites is an emerging technique in Brazil with high potential to obtain biotransformed compounds with new and different molecules which can show enhanced biological activities. Herein, microbial transformations of secondary metabolites from Viguiera robusta Gardn. (family Asteraceae), with emphasis in sesquiterp
Publicado em: 2008
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8. Multibiorreações e suas aplicações para as sinteses de compostos enantiomericamente puros / Multibioreactions applied to the syntheses of enantiomerically pure compounds
The utilization of enzymes for organic compound transformations is an alternative to classical syntheses. Enzymes are used as biocatalysts for the syntheses in vitro of asymmetric compounds because they are intrinsically chiral and result in high catalytic efficiency. In front of the biodiversity of existing microorganisms in Nature and of the necessity to d
Publicado em: 2006
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9. The pequi fruit (Caryocar brasiliense Camb.): vital cycle and aggregation of value for the minimal processing / Ciclo vital e agregaÃÃo de valores ao pequi
The species Caryocar brasiliense Camb. is very common in the region which composes the Cerrado (savanna-like vegetation), known popularly as pequi. It plays an important role in the life of the inhabitants in that region, whether economically with its sale in natura or even for its consumption. The purpose of this work was the characterization of the pequi a
Publicado em: 2005
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10. Effect of soybean oil in the endosulfan persistence in the environment. / Efeito de óleo de soja na persistência de endosulfan no ambiente.
The pesticides make part of a technology that is associated to the agriculture modernization. With their generalized use many problems occur and are diagnosed, among others, the water and soil contamination. The persistence in the environment is related to their physical and chemical properties, as well to the environment that defined the transport, retentio
Publicado em: 2005
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11. Preparation and activity of diterpenoids against trypomastigotes of Trypanosoma cruzi
A systematic investigation on the trypanocidal effect of several natural products isolated from Brazilian plant species has been carried out. In this paper we report on the results obtained from the screening of 26 diterpenes from natural sources or of synthetic/microbial transformations origin (mainly derivatives of kaurenoic acid) against trypomastigote fo
Revista Brasileira de Farmacognosia. Publicado em: 2002
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12. Microbial transformations of 7,2-dimethylbenz[a]anthracene.
Microbial transformations of 7,12-dimethylbenz[a]anthracene, a carcinogenic polycyclic aromatic hydrocarbon, in cultures of Pseudomonas aeruginosa and Penicillium notatum were studied by high performance liquid chromatographic separation of metabolic fractions followed by gas chromatographic-mass spectrometric analysis of the metabolites. Two methyl-hydroxyl