3,317 research outputs found
Characterization of Microbial Communities Associated with Ceramic Raw Materials as Potential Contributors for the Improvement of Ceramic Rheological Properties
Technical ceramics are being widely employed in the electric power, medical and engineering
industries because of their thermal and mechanical properties, as well as their high resistance qualities.
The manufacture of technical ceramic components involves complex processes, including milling
and stirring of raw materials in aqueous solutions, spray drying and dry pressing. In general, the
spray-dried powders exhibit an important degree of variability in their performance when subjected
to dry-pressing, which affects the efficiency of the manufacturing process. Commercial additives, such
as deflocculants, biocides, antifoam agents, binders, lubricants and plasticizers are thus applied to
ceramic slips. Several bacterial and fungal species naturally occurring in ceramic raw materials, such
as Sphingomonas, Aspergillus and Aureobasidium, are known to produce exopolysaccharides. These
extracellular polymeric substances (EPS) may confer unique and potentially interesting properties
on ceramic slips, including viscosity control, gelation, and flocculation. In this study, the microbial
communities present in clay raw materials were identified by both culture methods and DNA-based
analyses to select potential EPS producers based on the scientific literature for further assays based
on the use of EPS for enhancing the performance of technical ceramics. Potential exopolysaccharide
producers were identified in all samples, such as Sphingomonas sp., Pseudomonas xanthomarina,
P. stutzeri, P. koreensis, Acinetobacter lwoffi, Bacillus altitudinis and Micrococcus luteus, among bacteria.
Five fungi (Penicillium citrinum, Aspergillus niger, Fusarium oxysporum, Acremonium persicinum and
Rhodotorula mucilaginosa) were also identified as potential EPS producers.Fundação para a Ciência e a Tecnologia-EXPL/CTM-CER/0637/201
Cerebral Abscess in a Patient with Rendu-Osler-Weber
A telangiectasia hemorrágica hereditária é uma doença familiar rara, descrita pela primeira vez no final do século 19, caracterizada por telangiectasias mucocutâneas e viscerais, e por malformações arteriovenosas. Manifestações neurológicas ocorrem em 8 a 12% dos doentes e resultam em mais de metade dos casos
de malformações arteriovenosas pulmonares. A telangiectasia hemorrágica hereditária é uma das causas mais frequentes de abcessos cerebrais recorrentes, múltiplos e bilaterais, tendendo estes a ocorrerem na 3a para a 5a década. Apresentamos o caso de uma mulher de 88 anos admitida por prostração, febre e insuficiência respiratória, com a suspeita de metastização pulmonar de neoplasia oculta, cuja investigação revelou, entretanto, um abcesso cerebral secundário a malformações arteriovenosas pulmonares.
Apesar da antibioterapia e da drenagem cirúrgica do abcesso, a paciente veio a falecer. O prognóstico após drenagem dos abcessos sem ressecção das lesões pulmonares é desfavorável, podendo sua elevada mortalidade refletir um atraso diagnóstico pela falta de reconhecimento dessa associação.info:eu-repo/semantics/publishedVersio
Abcessos Hepáticos Recidivantes Provocados por Klebsiella Pneumoniae num Homem Diabético Não Asiático
The Klebsiella pneumoniae invasive syndrome, first described in Asia, is being reported in other parts of the world. It causes liver abcsesses, with or without extrahepatic lesions. Diabetes mellitus is the most common hosts’ underlying condition. It’s frequent among asian people, even outside Asia, appearing to exist genetic factors, not yet established, increasing the risk.
We present a case of a 55-year-old portuguese white diabetic man, who had a previous hospital admittion due to Klebsiella penumoniae pneumonia and a two-week latter diagnosis of liver abcsess. 4 years latter he was readmitted with nausea, chills, fever and myalgias. He had elevated inflammatory markers and the CT-scan showed 2 liver abscesses. Klebsiella pneumoniae was isolated in blood and antibiotics were given with complete clinical and imaging resolution. We present this case of relapsing Klebsiella pneumonia liver abscesses in a non-asian man emphasizing the growing incidence of this condition in Europe.info:eu-repo/semantics/publishedVersio
Liquid crystal phase and waterlike anomalies in a core-softened shoulder-dumbbells system
Using molecular dynamics we investigate the thermodynamics, dynamics and
structure of 250 diatomic molecules interacting by a core-softened potential.
This system exhibits thermodynamics, dynamics and structural anomalies: a
maximum in density-temperature plane at constante pressure and maximum and
minimum points in the diffusivity and translational order parameter against
density at constant temperature. Starting with very dense systems and
decreasing density the mobility at low temperatures first increases, reach a
maximum, then decreases, reach a minimum and finally increases. In the
pressure-temperature phase diagram the line of maximum translational order
parameter is located outside the line of diffusivity extrema that is enclosing
the temperature of maximum density line. We compare our results with the
monomeric system showing that the anisotropy due to the dumbbell leads to a
much larger solid phase and to the appearance of a liquid crystal phase. the
double ranged thermodynamic and dynamic anomalies.Comment: 14 pages, 5 figure
Resultados das ações de melhoramento de arroz nos projetos Agrosalud e Biofort.
O objetivo principal dos trabalhos é a recomendação de cultivares adaptadas ao ambiente e com maiores teores de ferro e zinco
Ultrafine grained titanium for biomedical applications: An overview of performance
AbstractUltrafine grain sized titanium (UFG Ti) obtained by severe plastic deformation presents a bright potential for biomedical applications because it provides the strength of titanium alloys without toxic alloying elements, such as Al and V that, by dissolving away from the implant, may be harmful to human health. The most recent developments and challenges in this field are reviewed. UFG Ti mini-devices were implanted in rabbits and the removal torque was compared with that of conventional commercially pure (cp) grain sized Ti Grade 2 and Ti6Al4V alloy Grade 5. The osseointegration of the UFG Ti was slightly superior of that of cp Ti Grade 2. The microstructure and mechanical properties of the UFG Ti, with special emphasis on dental implant application are reviewed and some additional properties evaluated and presented
CO024. FATORES PREDITIVOS DE UMA BOA RESPOSTA À TERAPÊUTICA COM BOMBA DE INFUSÃO SUBCUTÂNEA CONTÍNUA DE INSULINA
Arroz aromático: uma nova opção de arroz para o mercado.
A Embrapa Arroz e Feijão fez uma parceria com a Faculdade Anhanguera de Ciências Humanas, para realizar um estudo com o objetivo de verificar a aceitabilidade e possíveis nichos de mercado do arroz aromático em Goiânia. A metodologia consistiu de uma amostragem aleatória da população local e verificação, por meio de uma análise sensorial, de como o produto era percebido.bitstream/CNPAF/21524/1/comt_60.pd
Níveis de ferro e zinco e retenção mineral de arroz integral e polido após cozimento.
O objetivo deste trabalho foi determinar as concentrações de ferro e zinco e ácido fítico em grãos de 14 genótipos de arroz integral e polido, cru e cozido, para determinação indireta da biodisponibilidade e da retenção mineral.Pôster - graduação
An Evaluative Model to Assess the Organizational Efficiency in Training Corporations
In an organisation any optimization process of its issues faces increasing challenges and requires new approaches to the organizational phenomenon.
Indeed, in this work it is addressed the problematic of efficiency dynamics through intangible variables that may support a different view of the corporations. It focuses on the challenges that information management and the incorporation of context brings to competitiveness. Thus, in this work it is presented the analysis and development of an intelligent decision support system in terms of a formal agenda built on a Logic Programming based methodology to problem solving, complemented with an attitude to computing grounded on
Artificial Neural Networks. The proposed model is in itself fairly precise, with
an overall accuracy, sensitivity and specificity with values higher than 90 %.
The proposed solution is indeed unique, catering for the explicit treatment of
incomplete, unknown, or even self-contradictory information, either in a
quantitative or qualitative arrangement
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