Reparação de defeitos osteocondrais de cães com implante de cultura de condrócitos homólogos e membrana biossintética de celulose: avaliação clínica, ultrassonográfica e macroscópica

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Síntese de acetato de celulose a partir da palha de feijão utilizando N-bromossuccinimida (NBS) como catalisador

Neste estudo a celulose obtida da palha de feijão foi utilizada para produzir um material hidrofóbico (acetato de celulose) para ser avaliado como absorvente de óleo. Nas reações de acetilação foram utilizados anidrido acético e dois catalisadores, a piridina (PY) e N-bromossuccinimida (NBS). Os materiais produzidos foram caracterizados por espectroscopia na região do infravermelho médio, microscopia eletrônica de varredura, difratometria de raios-X e análise elementar. O NBS mostrou-se mais eficiente que a PY e, seu uso resultou em materiais com maiores quantidades de grupos acetatos, mais hidrofóbicos e com maiores capacidades de absorção de óleo de soja.

Estudo das propriedades de troca iônica e/ou adsorção da celulose e celuloses modificadas

In this work it was studied the capacity of cellulose and chemically modified celluloses (carboxymethylcellulose, cellulose phosphate and oxicellulose) to adsorb copper(II) cations of aqueous and non aqueous solutions. The influence of the principal physical chemical parameters on the adsorption process was examined using the batch adsorption method and copper(II) perchlorate solutions, the maximum adsorption capacity determined for adsorbents were as follows (mol.g(-1)): cellulose, 0.54 . 10(-5); carboxymethylcellulose, 1.28 . 10(-4); cellulose phosphate, 1.12 . 10(-4); oxicellulose, 0.38 . 10(-4).

CELULOSE FIBROSA DO BAGACO DA CANA-DE-ACUCAR - AVALIACAO DA ACAO AGLUTINANTE/DESAGREGANTE EM COMPRIMIDOS CONTENDO FARMACO HIDROSSOLUVEL

In this work, a fibrous cellulose obtained from the sugar cane bagasse was analysed about its binder/disintegrating action and about its interference degree in the dissolution rate ('in vitro') of active principles, when incorporated in a compact system that has a water-soluble drug. It was used as reference drug the Lithium Carbonate, considering its solubility in water and it difficulties in the compressibility and flow rate. That cellulose was evaluated in a comparative study, involving another fibrous cellulose generally used in the tablet obtainment (Microcel 3E-200). After the experiment in methodologies of dry granulation and wet granulation, it was concluded that the analysed celluloses presents adequate binder/disintegrating efficience and they are equivalents in these aspect.

A compostagem como processo catalisador para a reutilização dos resídues de fábrica de celulose e papel

Recognizing the great potential of this residue to increase the eucalyptus forests produtivity - when used in its humidified form - the main objective of this project was to decompose the solid residues generated at Luiz Antonio mill, in a fast and artificial way, by means of piles or ridges of composted materials. The materials used in this composting process were: activated sludge, dregs and grits, wood ash and biomass. Applications of both phosphorus and potassium have been used during the planting phase. Nitrogen, in the form of urea, has been applied in two treatments with the main purpose to decrease the C/N ratio and to speed up the decomposition process. The experiment was carried out in 120 days. The best results were obtained in residue piles with a 3:1 ratio, i.e., 75% residues + 25% biomass. This mixture provided an extremely good aeration, thus enabling an appropriate material mixing and homogenization. Under the technological viewpoint, the results obtained from the composting process were quite satisfactory for VCP industrial residues treatment. This composting process enabled a material accelerated stabilization (lower C/N ratio) and homogenization. After this experiment, it became possible to use all residues just as they were generated by Luiz Antônio pulp and paper mill. This project is of the utmost relevance to VCP's forestry department as far as a significant amount of nutrients is getting back to the soil in the form of mineral and organic materials.

Influência das propriedades de granulados de celulose nas características físicas dos comprimidos

The compaction behavior of powdered solids can be strongly influenced by the physicochemical properties of excipients because they are frequently present in the tablet in larger amounts than the drug itself. The aim of this study was to assess the influence of the granule size of the cellulose on the physical characteristics of tablets produced in punches of different diameters, since this relation has never been explored in the literature. Granules of several sizes were produced by wet granulation and compressed in punches of various diameters by applying different forces. Size distribution, apparent density and flow of granules were assessed, as well as physical characteristics of the tablets (weight, hardness, friability and disintegration time). Reducing the granule size resulted in tablets of adequate crushing strength and fast disintegration; moreover, it allowed tablets to be produced without the need to use forces near the upper limit of the press, thus avoiding premature wear on the tabletting machine. Thus, once a suitable size for a given tablet formulation has been chosen, the granule size selected has been shown to determine the crushing strength of the tablet.

Desenvolvimento de métodos de cultivo de Gluconacetobacter xylinus para obtenção de compósitos à base de celulose bacteriana e colágeno tipo I adicionado in situ

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

Isolamento de leveduras fermentadoras de pentoses e suas aplicações na produção de xilitol e etanol a partir do licor negro proveniente do processo Kraft de extração da celulose

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Análise do setor de celulose e papel na era da globalização: um olhar sobre sua produção e mão-de-obra

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Emprego de membrana de celulose microfibrilar na ceratoplastia lamelar em coelhos (O. cuniculus, Linnaeus, 1758): aspectos clínicos, morfológicos e imunoistoquimicos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Utilização de membrana biossintética de celulose em trocleoplastia experimental em cães

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo do comportamento coloidal de suspensão de fibra de celulose, carbonato de cálcio, amido catiônico: variação da força iônica e do pH

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Determinação da fração lábil de Ba em água produzida de petróleo utilizando a técnica de difusão em filmes finos por gradiente de concentração com a membrana fosfato de celulose (P81) como agente ligante

Pós-graduação em Geociências e Meio Ambiente - IGCE