|
|
|
| Registros recuperados: 12 | |
|
| |
|
|
| Schmerder,A.; Richter,T.; Langowski,H.-C.; Ludwig,H.. |
| Little is known about the barrier properties of polymer films during high pressure processing of prepackaged foods. In order to learn more about this, we examined the influence of high hydrostatic pressure on the permeation of raspberry ketone (dissolved in ethanol/water) through polyamide-6 films at temperatures between 20 and 60ºC. Permeation was lowered by increasing pressure at all temperatures. At 23°C, the increasing pressure sequence 0.1, 50, 100, 150, and 200 MPa correlated with the decreasing permeation coefficients P/(10(9) cm² s-1) of 6.2, 3.8, 3.0, 2.2, and 1.6. Analysis of the permeation kinetics indicated that this effect was due to a reduced diffusion coefficient. Pressure and temperature acted antagonistically to each other. The decrease in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hydrostatic pressure; Polyamide-6 films; Permeation through polymers; Raspberry ketone. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000800018 |
| |
|
|
| Bao,Chengman; Tang,Xinhui; Ye,Shuming. |
| ABSTRACT The effect of pressure on the fluorescence of tryptophan in the presence of metal ions was studied by fluorescence spectrometry. It was found that at 60 MPa, the fluorescence intensity of M/Trp mixtures (M represented metal ions) increased compared to that at atmosphere pressure. The relative fluorescence efficiency of M/Trp mixtures increased with pressure. When the M/Trp ratio was above 10:1, the relative fluorescence efficiency in decreasing order was Cu2+/Trp mixtures, Ni2+/Trp mixtures and Mg2+ (K+)/Trp mixtures. When the ratio was below 10:1, the decreasing order was Cu2+/Trp mixtures and Ni2+ (Mg2+, K+)/Trp mixtures. The relative fluorescence efficiency increased with the concentration of Cu2+ and Ni2+. The variation was relate to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hydrostatic pressure; Tryptophan; Fluorescence; Metal ions. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100605 |
| |
|
| |
|
|
| Mignaco,J.A.; Lima,L.M.T.R.; Rosenthal,A.; Foguel,D.; Silva,J.L.. |
| The 3rd International Conference on High Pressure Bioscience and Biotechnology was held in the city of Rio de Janeiro from September 27 to September 30, 2004. The meeting, promoted by the International Association of High Pressure Bioscience and Biotechnology (IAHPBB), congregated top scientists and researchers from all over the world. In common, they shared the use of hydrostatic pressure for research, technical development, or industrial applications. The meeting consisted of invited lectures, contributed papers and a well-attended poster session. Very exciting discussions were held inside and outside the sessions, and the goals of discussing state-of-the-art data and establishing working collaborations and co-operations were fully attained. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hydrostatic pressure; Phase diagram; Compressibility; Protein folding; Food technology; Piezotolerance. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000800001 |
| |
|
|
| SILVA, D. A. da; SILVA, A. de S.; GHEYI, H. R.. |
| Trata do metodo de irrigacao por capsulas porosas, funcionando sob pressao, e tecnicamente viavel para pequenas areas de propriedades agricolas que dispoem de recursos hidricos limitados, devido ao baixo consumo de agua requerido. Consumo estimado em 1.000 m3/ha/2.500 capsulas/90 dias. As caracteristicas tecnicas do metodo de irrigacao por capsula porosa foram avaliadas, atraves do registro diario da liberacao de agua no solo e sua distribuicao no tempo e especo, para diferentes populacoes de plantas de milho (Zea mays L.), cultivar Centralmex. Realizou-se observacoes dos seguintes fatores climaticos: precipitacao, temperatura do ar, evaporacao do Tanque Classe A e umidade relativa na Estacao Experimental de Bebedouro durante um periodo de 74 dias. |
| Tipo: Parte de livro |
Palavras-chave: Capsula porosa; Porous capsule; Hydrostatic pressure; Irrigação; Método; Pressão Hidrostática; Irrigation. |
| Ano: 1981 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133279 |
| |
|
|
| SILVA, D. A. da; GHEYI, H. R.; SILVA, A. de S.; MAGALHAES, A. A.. |
| Consistiu na determinacao do efeito das diferentes pressoes hidrostaticas e populacoes de plantas atraves do metodo de irrigacao por capsulas porosas, sobre a producao do milho (Zea mays L.), cultivar Centralmex. O plantio do milho foi realizado manualmente, sendo as sementes distribuidas em numero de tres por cova, num raio de 20 cm e, igualmente, espacadas ao redor de cada capsula porosa. No presente trabalho a populacao de sete plantas por capsula porosa apresentou a maxima producao que convertida para uma densidade de 50.000 plantas por hectare corresponderia a producao estimada de 6.150 kg/ha. O metodo de irrigacao em estudo apresentou alta eficiencia de uso de agua, em media 1,9 kg/m3 que representa quase o dobro das eficiencias conseguidas pelos... |
| Tipo: Parte de livro |
Palavras-chave: Capsula porosa; Porous capsule; Hydrostatic pressure; Maize; Production; Irrigação; Milho; Produção; Zea Mays; Irrigation. |
| Ano: 1981 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133278 |
| |
|
|
| Takai, Ken; Miyazaki, Masayuki; Hirayama, Hisako; Nakagawa, Satoshi; Querellou, Joel; Godfroy, Anne. |
| P>Two novel, thermophilic piezophiles, capable of chemolithoautotrophic growth, are successfully cultivated and isolated from a black smoker chimney at the TAG field (Mid Atlantic Ridge: MAR) by using a piezophilic cultivation technique. Both strains (strains 106 and 108) represent dominant cultivated populations of the microbial communities in the chimney surface habitat. Strain 106 represents typically thin, long spiral cells under the piezophilic growth condition but short bent cells under the non-piezophilic condition. It is a strictly chemolithoautotrophic gammaproteobacterium using reduced sulfur compounds as the electron donors, and nitrate and O-2 as the electron acceptors. Based on the 16S rRNA gene sequence, strain 106 would represent a novel... |
| Tipo: Text |
Palavras-chave: Sp. nov.; Ecological signifiance; Hydrostatic pressure; Subsurface biosphere; Base composition; High temperature; Membrane lipids; Gen. nov.; Microorganisms; Diversity. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6652.pdf |
| |
|
| |
|
| |
|
|
| Matsuoka,H.; Suzuki,Y.; Iwahashi,H.; Arao,T.; Suzuki,Y.; Tamura,K.. |
| The aim of the present study was to examine the feasibility of DNA microarray technology in an attempt to construct an evaluation system for determining gas toxicity using high-pressure conditions, as it is well known that pressure increases the concentration of a gas. As a first step, we used yeast (Saccharomyces cerevisiae) as the indicator organism and analyzed the mRNA expression profiles after exposure of yeast cells to nitrogen gas. Nitrogen gas was selected as a negative control since this gas has low toxicity. Yeast DNA microarray analysis revealed induction of genes whose products were localized to the membranes, and of genes that are involved in or contribute to energy production. Furthermore, we found that nitrogen gas significantly affected the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: DNA microarray; Yeast; Hydrostatic pressure; Gas pressure; Nitrogen gas. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000800016 |
| |
|
|
| Davies, Peter; Riou, Luc; Mazeas, Florence; Warnier, Philippe. |
| A study of thermoplastic matrix composites has been performed to investigate their use in underwater applications such as oceanography, submarine, and sub-sea offshore structures. This article first presents six candidate materials. Results from simple mechanical and seawater aging screening tests on flat specimens are then described. Glass/epoxy and carbon/epoxy composites are used as reference materials. Two materials emerged from this process, glass/PEI and carbon/PEEK. Cylinders of both were manufactured and subjected to hydrostatic pressure tests, and results are compared to those for glass/epoxy and carbon/epoxy cylinders of similar geometry. The carbon/PEEK material appeared most promising. It resisted pressures in excess of 90 MPa and was retained... |
| Tipo: Text |
Palavras-chave: Damage tolerance; Glass/PEI; Carbon/PEEK; Aging; Hydrostatic pressure; Cylinder. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-1037.pdf |
| |
| Registros recuperados: 12 | |
|
|
|
