4,634 research outputs found
New lamellar phase with pores in the chain-melting regime of an anionic phospholipid dispersion
No full textThe anionic phospholipid DMPG (dimyristoyl phosphatidylglycerol) may exhibit in water, instead of a unique melting transition of the hydrocarbon chains, a "melting regime" for pH values above 5, where the phosphate groups are deprotonated, and for low ionic strength, where charge screening is weak. The chain-melting process of DMPG starts at Tmon (onset of the melting regime at ∼ 20°C), but the complete fluid phase exists only above Tmoff (offset of the melting regime at ∼ 30°C). In a recent paper we developed a SAXS model for a bilayer with pores to explain SAXS results obtained for concentrations up to 70 mM DMPG (F. Spinozzi, L. Paccamiccio, P. Mariani, and L. Q. Amaral, Langmuir, in print, 2010). A new lamellar phase with pores, starting 3°C above T mon and existing up to 4°C above Tm off, was also identified at the higher investigated DMPG concentrations (up to 300 mM DMPG). In this paper we focus in more detail the SAXS curves obtained in the concentration interval 70-300 mM DMPG. The slope of the scattering profile in the very small q range, as well as the anomalous increase in the intensity of the bilayer band centered around 0.12 Å-1 after Tmoff, have been in particular analyzed. By using a model of water-penetrated bilayers, the volume fractions of DMPG and water molecules inside the bilayer was derived as a function of temperature
Melting regime of the anionic phospholipid DMPG: new Lamellar phase and porous bilayer model
No full textAqueous dispersions of the anionic phospholipid dimyristoyl phosphatidylglycerol (DMPG) at pH above the
apparent pK of DMPG and concentrations in the interval 70-300 mM have been investigated by small (SAXS) and
wide-angle X-ray scattering, differential scanning calorimetry, and polarized optical microscopy. The order-disorder
transition of the hydrocarbon chains occurs along an interval of about 10 C (between Tm
on ∼ 20 C and Tm
off ∼ 30 C).
Such melting regime was previously characterized at lower concentrations, up to 70 mM DMPG, when sample
transparency was correlated with the presence of pores across the bilayer. At higher concentrations considered here, the
melting regime persists but is not transparent. Defined SAXS peaks appear and a new lamellar phase Lp with pores is
proposed to exist above 70 mM DMPG, starting at ∼23 C (∼3 C above Tm
on) and losing correlation after Tm
off. A new
model for describing the X-ray scattering of bilayers with pores, presented here, is able to explain the broad band
attributed to in-plane correlation between pores. The majority of cell membranes have a net negative charge, and the
opening of pores across the membrane tuned by ionic strength, temperature, and lipid composition is likely to have
biological relevance
Lipid-drug interaction: a structural analysis of pindolol effects on model membranes.
No full textThe ternary system constituted by distearoylphosphatidylcholine, pindolol (a vasodilator drug) and water has been investigated by using X-ray diffraction and calorimetric techniques. The structural modifications induced by the drug have been determined and a possible interaction model has been derived. In particular, the pindolol content-temperature dependent phase diagram shows the occurrence of two new phases: the first is an interdigitated gel, and the second is a lamellar structure presenting an unusual mixed disordered-ordered conformation of the hydrocarbon chains (Lαβ). The comparative analysis of electron density profiles relative to the Lαβ phase, reveals significant modifications in the paraffinic region of the lipid layer. In agreement with thermodynamic results, the structural data suggest that the drug induces a stiffening and a tightening of the hydrocarbon chains. Moreover, the hydrophilic properties of the membrane (particularly in Pβ, and Lαβ phases) present an evident dependence with the drug concentration
QCD traveling waves phenomenology revisited
Get PDFIn this paper, we review and update the Amaral-Gay Ducati-Betemps-Soyez saturation model, by testing it against the recent H1-ZEUS combined data on deep inelastic scattering, including heavy quarks in the dipole amplitude. We obtain that this model, which is based on traveling wave solutions of the Balitsky-Kovchegov equation and built in the momentum space framework, yields very accurate descriptions of the reduced cross section, σ r ( x , y , Q 2 ) , as well as DIS structure functions such as F 2 ( x , Q 2 ) and F L ( x , Q 2 ) , all measured at HERA. Additionally, it provides good descriptions of heavy quark structure functions, F c c 2 and F b b 2 at small- x and Q 2 ≲ 60 GeV 2 . We also use the improved model to make predictions for structure functions to be measured in the near future at LHeC
Separação de resíduos sólidos e efeitos ambientais e econômicos.
No full textEste estudo investiga as perdas devido à má segregação dos resíduos e os custos socioeconômicos e ambientais associados a essa ação. Através do monitoramento e pesagem dos resíduos sólidos recolhidos em uma empresa de pesquisa na região de Pelotas, foi possível identificar que a separação apresentou benefícios, levando 65,55 kg de recicláveis aos cooperados no período de vinte e seis dias, o que gerou um lucro de R$117,33, além de aumentar a eficiência na gestão de resíduos.5. SiGA
Produção de biodiesel a partir de sementes de pinhão-manso (Jatropha curcas L.) e etanol em reator supercrítico
Get PDFDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Química.O pinhão-manso (Jatropha curcas L.) é uma planta de crescimento rápido e tem sido sugerida para a produção de biocombustível, principalmente por suas sementes possuírem alto conteúdo de óleo (32 % a 52 %). Devido à oscilação no preço do petróleo e a grande preocupação com o meio ambiente, muito se tem investido em combustíveis alternativos como o biodiesel. A rota mais utilizada para sua produção é a transesterificação catalítica alcalina homogênea, porém, possui um alto custo e alto tempo reacional. Uma alternativa é a transesterificação não-catalítica, que permite altas conversões e a redução do tempo de reação. Então, o presente trabalho teve por objetivo produzir biodiesel a partir de sementes de pinhão-manso e etanol em reator supercrítico, bem como realizar a caracterização da biomassa empregada e do produto obtido. Os experimentos foram desenvolvidos no LCP/UFSC e no LEDBIO/UFT. Foram realizadas análises físico-químicas das sementes (teor de umidade, teor de cinzas e acidez) e a extração do óleo para seis diferentes granulometrias em soxhlet com hexano. O óleo foi analisado quanto suas características físicas (densidade e viscosidade cinemática) e químicas (índice de acidez, índice de saponificação e teor de ácidos graxos). Para a produção de biodiesel no reator supercrítico foi adotado o planejamento fatorial 23 com ponto central, sendo empregadas três faixas de temperatura (245 ºC, 255 ºC e 265 ºC), três relações molares óleo/álcool (1 : 10, 1 : 20 e 1 : 30) e três granulometrias de sementes (inteiras, cortadas ao meio e trituradas), sendo que ao final o efeito de cada variável e de suas interações foram calculados. Os rendimentos em extração do óleo das sementes de pinhão-manso e da produção de biodiesel foram calculados, e as amostras obtidas no processo analisadas por GC/MS. As sementes apresentaram em média 5,28 % de umidade, 3,16 % de cinzas, 5,66 % de acidez e entre 6,53 % a 53,63 % de óleo para as diferentes granulometrias utilizando extrator soxhlet com hexano. O óleo apresentou em média: densidade de 0,9173 g/cm3 a 25 ºC, viscosidade cinemática de 20,03 mm2/s a 40 ºC, índice de acidez de 11,8 mg KOH/g, índice de saponificação de 188,22 mg KOH/g e era constituído principalmente por ácidos graxos insaturados (79,5 %), em sua maioria por ácidos graxos olêico (39,7 %) e linolêico (38,7 %). No reator supercrítico, o rendimento em óleo variou de 48,20 % a 108,17 % quando comparado com a extração utilizando soxhlet, e o rendimento em biodiesel variou entre 29,44 % a 63,00 %. Pela acidez apresentada as sementes possivelmente sofreram deterioração no período de armazenamento, sendo que óleo apresentou características físicas e químicas e de conteúdo de óleo semelhantes da literatura. Com o uso do reator supercrítico conseguiu-se extrair uma quantidade maior de óleo, porém, os rendimentos em biodiesel foram intermediários, possivelmente em função do tempo de residência e os modos de operação. Através da caracterização química das amostras verificou-se que em média os ésteres corresponderam a 64,73 % dos compostos presentes, sendo identificados também glicerídeos, ácidos graxos, fenóis e cetonas.The jatropha (Jatropha curcas L.) is a plant of rapid growth and has been suggested for biofuel production, mainly for its seeds have high oil content (32% to 52%). Due to the fluctuation in oil prices and great concern for the environment, much has been invested in alternative fuels like biodiesel. The route most commonly used for its production is transesterification homogeneous alkaline catalyst, however, it is high cost and high reaction time. An alternative is the non-catalytic transesterification, which allows high conversions and reduced reaction time. The present work aimed to produce biodiesel from Jatropha seeds and ethanol in supercritical reactor, as well as perform the characterization of biomass used and product. The experiments were carried out in LCP/UFSC and LEDBIO/UFT. Analysis physicochemical were performed for the properties of seeds (moisture content, ash content and acidity) and the extraction of oil for six different particle sizes with hexane. The oil was analyzed for its physical properties (density, kinematic viscosity) and chemical properties (acid value, saponification value, fatty acid content). For the production of biodiesel in the reactor supercritical was adopted factorial design 23 with center point, and employed three temperature ranges (245 ºC, 255 ºC and 265 ºC), three molar ratios oil/ethanol (1 : 10, 1 : 20 and 1 : 30) and three seed sizes (whole seed, seed in half and seed crushed) and the effect of each variable and their interactions were calculated. The yields of extraction of oil from the seeds of jatropha and biodiesel production were calculated, and the samples obtained in the process analyzed by GC/MS. The seeds had on average 5.28% moisture content, 3.16% ash content, 5.66% acidity and oil content of 6.53% to 53.63% for the different particle sizes using soxhlet extractor with hexane. The Jatropha oil had on average density 0.9173 (g/cm3 at 25 °C), kinematic viscosity 20.03 (mm2/s at 40 °C), acid value 11.8 (mg KOH/g) and saponification value 188.22 (mg KOH/g), and was consisted mostly of unsaturated fatty acids (79.5%), mainly oleic acid (39.7%) and linoleic acid (38.7%). In the supercritical reactor, the yield of oil extraction ranged from 48.20% to 108.17% when compared with extraction using hexane, and the biodiesel yield ranged from 29.44% to 63.00%. The seeds probably suffered deterioration in the storage period because it had a high acidity, the oil has physical and chemical characteristics and oil content similar to that found in other studies. With the use of supercritical reactor it was possible to extract a greater amount of oil, however, the yields were intermediate biodiesel, possibly as a function of residence time and modes of operation. Through the chemical characterization of the samples was found that on average the esters corresponding to 64.73% of the compounds present, and also identified glycerides, fatty acids, phenols and ketones
Search for a heavy Standard Model Higgs boson in the channel H -> ZZ -> l(+)l(-) q(q)over-bar using the ATLAS detector
No full textA search for a heavy Standard Model Higgs boson decaying via H -> ZZ -> l(+)l(-)q (q) over bar, where l = e, mu, is presented. The search is performed using a data set of pp collisions at root s = 7 TeV, corresponding to an integrated luminosity of 1.04 fb(-1) collected in 2011 by the ATLAS detector at the CERN LHC collider. No significant excess of events above the estimated background is found. Upper limits at 95% confidence level on the production cross section (relative to that expected from the Standard Model) of a Higgs boson with a mass in the range between 200 and 600 GeV are derived. Within this mass range, there is at present insufficient sensitivity to exclude a Standard Model Higgs boson. For a Higgs boson with a mass of 360 GeV, where the sensitivity is maximal, the observed and expected cross section upper limits are factors of 1.7 and 2.7, respectively, larger than the Standard Model prediction. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.AuthorOverflow(3025
Identification And Control Of Processes Via Developments In The Orthonormal Series Part A: Identification _net Identificação E Controle De Processos Via Desenvolvimentos Em Séries Ortonormais. Parte A: Identificação
No full textIn this paper, an overview about the identification of dynamic systems using orthonormal basis function models, such as those based on Laguerre and Kautz functions, is presented. The mathematical foundations of these models as well as their advantages and limitations are discussed within the contexts of linear, robust, and nonlinear identification. The discussions comprise a broad bibliographical survey on the subject and a comparative analysis involving some specific model realizations, namely, linear, Volterra, fuzzy, and neural models within the orthonormal basis function framework. Theoretical and practical issues regarding the identification of these models are also presented and illustrated by means of two case studies related to a polymerization process.183301321Aguirre, L.A., (2004) Introdução à Identificação de Sistemas: Técnicas Lineares e Não Lineares Aplicadas a Sistemas Reais, , 2 edn, Editora UFMGAguirre, L.A., Correa, M.V., Cassini, C., Nonlinearities in NARX polynomial models: Representation and estimation (2002) IEE Proc. 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