Consulta: subjectFacets:"Hydrostatic pressure"
Registros recuperados: 12
Data/hora: 16/06/2024 11:13:24

Irrigacao por capsulas porosas III: avaliacao tecnica do metodo por pressao hidrostatica.
Provedor de dados: 14
Autores: 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: Capítulo em livro técnico (INFOTECA-E)
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

Irrigacao por capsulas porosas IV: efeitos das diferentes pressoes hidrostaticas e populacoes de plantas sobre a producao do milho.
Provedor de dados: 14
Autores: 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: Capítulo em livro técnico (INFOTECA-E)
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

Measuring the biological impact of drilling waste on the deep seafloor: an experimental challenge
Provedor de dados: 5
Autores: Lelchat, F.; Dussauze, M.; Lemaire, P; Theron, M.; Toffin, Laurent; Le Floch, Stephane.
The depletion of traditional oil fields is driving the oil &amp; gas industry to explore new exploitation sites previously considered as unprofitable. Deep-sea oil fields represent one of these new areas of exploitation. Well drilling during exploration and production operations generate large quantities of drilling waste whose biological impact on the deep-sea floor remains largely unknown. Because of the harsh abiotic factors characterizing this environment, the evaluation of this impact remains challenging. High hydrostatic pressure is the prominent factor which will affect in-situ biological processes. This review will examine the feedback on the various strategies used to evaluate the biological impact of deep-sea drilling waste deposition as well as...
Tipo: Text
Palavras-chave: Drill cutting; Drilling waste; Ecotoxicology; Bioassay; Hydrostatic pressure; Deep-sea; Environmental assessment.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00603/71561/69988.pdf

Isolation and physiological characterization of two novel, piezophilic, thermophilic chemolithoautotrophs from a deep-sea hydrothermal vent chimney
Provedor de dados: 5
Autores: Takai, Ken; Miyazaki, Masayuki; Hirayama, Hisako; Nakagawa, Satoshi; Querellou, Joel; Godfroy, Anne.
P&gt;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

Etude de la diversité microbienne des bassins hypersalés anoxiques profonds de la Mer Méditerranée orientale
Provedor de dados: 5
Autores: L'Haridon, Stephane.
 Since 1983, the existence of Deep Hypersaline anoxic basins (DHABs) has been revealed in the Eastern Mediterranean basin. These basins which represent extremes environments (anoxic, hypersalty, dark, high hydrostatic pressure)  have  been  under  investigation  and  increasing  interest  the  last  fifteen  years.  The  molecular  approaches revealed  the  presence  of  active  and  uncultivated  microbial  communities  in  the  DHABs  with  two  main  metabolic processes  such  as  methanogenesis  and  sulphate-reduction.  Until  now,  no  representative  strain  of  the  different uncultivated lineages thriving in the DHABs (ex : lineages MSBL, Mediteranean Sea Brine Lake) or involved in the two processes  have  been  yet  cultivated.  The  main ...
Tipo: Text
Palavras-chave: DHABs; Environnement extrême; Methanohalophilus; Pression hydrostatique; Génome.; DHABs; Extreme environnement; Methanohalophilus; Hydrostatic pressure; Genome.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00609/72136/70888.pdf

Thermoplastic composite cylinders for underwater applications
Provedor de dados: 5
Autores: 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

Long-term maintenance and public exhibition of deep-sea Hydrothermal fauna: the AbyssBox project
Provedor de dados: 5
Autores: Shillito, Bruce; Ravaux, Juliette; Sarrazin, Jozee; Zbinden, Magali; Sarradin, Pierre-marie; Barthelemy, Dominique.
The AbyssBox project aims to provide the first permanent public exhibition of live deep-sea hydrothermal fauna maintained at in situ pressure. AbyssBox is a pressurized aquarium designed to function permanently. Here we present details of the project after the public exhibition functioned for more than three years at Océanopolis aquarium in Brest, France. We also describe the AbyssBox pressure aquarium, and provide data and observations on vent shrimp (Mirocaris fortunata) and crabs (Segonzacia mesatlantica) that were sampled from 1700 m depth at the Lucky Strike vent field (Mid-Atlantic Ridge) during different cruises. While mortalities exceeded 50% during the first days following sampling, the remaining animals appeared to acclimate fairly well. Some...
Tipo: Text
Palavras-chave: AbyssBox; Aquaria; Aquariology; Deep waters; Hydrostatic pressure; Hydrothermal vents; Public exhibition; Scientific experiments.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00268/37967/36046.pdf

Analysis of the Economic Effects of Requiring Post-harvest Processing for Raw Oysters
Provedor de dados: 31
Autores: Muth,   Mary K.; Viator,   Catherine; Karns,   Shawn A.
Tipo: Conference Paper or Presentation
Palavras-chave: Oysters; Post-harvest processing; Hydrostatic pressure; Cool pasteurization; GIS; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; L510; Q180; Q220.
Ano: 2011
URL: http://purl.umn.edu/103814

Effect of Hydrostatic Pressure on the Fluorescence of Tryptophan in the Presence of Metal Ions Running title: Effect of pressure on the tryptophan
Provedor de dados: 52
Autores: 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

Highlights of the 3rd International Conference on High Pressure Bioscience and Biotechnology
Provedor de dados: 56
Autores: 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

Effect of high hydrostatic pressure on the barrier properties of polyamide-6 films
Provedor de dados: 56
Autores: 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

The biological effects of high-pressure gas on the yeast transcriptome
Provedor de dados: 56
Autores: 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