Search results for "SMOS"
showing 10 items of 444 documents
Pump and Displacement Currents of Reconstituted ATP Synthase on Black Lipid Membranes
1988
Purified ATP synthase (F0F1) from Rhodospirillum rubrum was reconstituted into asolectine liposomes which were then adsorbed to a planar lipid bilayer. After the addition of an inactive photolabile ATP derivative (caged ATP), ATP was released after illumination with u.v.-light, which led to a transient current in the system. The transient photocurrent indicates that the vesicles and the planar membrane are capacitatively coupled. Stationary pump currents were obtained after addition of protonophores. These currents are specifically inhibited by oligomycin and stimulated threefold by inorganic phosphate (Pi). In analogy oligomycin sensitive pump currents in the reverse direction coupled to n…
Phenolic profiles of olive mill wastewaters treated by membrane filtration systems
2014
BACKGROUND Olive mill wastewater is an important by-product obtained after olive oil extraction. In this investigation, the phenolic composition of olive mill wastewater treated with a semi-industrial membrane filtration system, including ultrafiltration and reverse osmosis modules, was studied. In particular, untreated olive mill wastewater was compared with the permeate and the concentrate fractions of each filtration step. RESULTS 3,4-(dihydroxyphenyl) ethanol and p-(hydroxyphenyl) ethanol were the main compounds of all olive mill wastewater analyzed. A total of 32 compounds, detected at 240 or 280 nm by HPLC-DAD, were considered for phenol quantification. Ultrafiltration reduced phenol …
Optical experiments on a crystallizing hard-sphere–polymer mixture at coexistence
2010
We report on the crystallization kinetics in an entropically attractive colloidal system using a combination of time resolved scattering methods and microscopy. Hard sphere particles are polystyrene microgels swollen in a good solvent (radius a=380nm, starting volume fraction 0.534) with the short ranged attractions induced by the presence of short polymer chains (radius of gyration rg = 3nm, starting volume fraction 0.0224). After crystallization, stacking faulted face centred cubic crystals coexist with about 5% of melt remaining in the grain boundaries. From the Bragg scattering signal we infer the amount of crystalline material, the average crystallite size and the number density of cry…
Optimal design of cogeneration plants for seawater desalination
2004
Multi-stage flash (MSF) and reverse osmosis (RO) are the most common techniques for seawater desalination. A significant difference between these methodologies consists of their different energy requirements, i.e., thermal energy for MSF and mechanical energy for RO plants. The presence of both desalination systems (MSF and RO) appears to be suitable for cogeneration plants. The reject heat from the power cycle can feed an MSF section, while some power feeds the RO section and the MSF auxiliary equipment; the rest is sold to the grid. A criterion for the optimal design of such tri-functional cogeneration plants is proposed, based on exergo-economics and on profit maximization. In particular…
Omics approaches to study the oral microbiome
2015
Introducción La visión clásica de los microorganismos como agentes infecciosos ha propiciado que se consideren como meros agentes causales de enfermedades. Sin embargo, la larga historia de coexistencia entre microorganismos y los seres humanos, ha hecho que ambos se hayan adaptado mutuamente y coevolucionen (Dubos et al. 1965, McFall-Ngai 2002). De hecho, en el cuerpo humano habitan 1014 células bacterianas, un orden de magnitud más que células humanas (Savage 1977). Entre los beneficios que la microbiota aporta, están su contribución a digerir alimentos y a aportar nutrientes, regulación del metabolismo, maduración del sistema inmune, etc. Por ello, hoy en día las enfermedades de origen…
Zvaigžņotā Debess: 2017, Rudens (237)
2017
Contents: “ZVAIGŽŅOTĀ DEBESS” FORTY YEARS AGO: U.Dzērvītis. Dispute on Hubble’s Constant Value (abridged) ; E.Mūkins. Ten «Venera»’s: Devices, Journeys and Results (abridged) ; DEVELOPMENTS in SCIENCE: K.Schwartz. New Discoveries in the Orion Molecular Cloud Complex ; SPACE RESEARCH and EXPLORATION: J.Jaunbergs. Salty Emanations of Enceladus ; R.Misa. Voyager: the Longest and Farthest ; OBSERVATORIES and INSTRUMENTS: J.Kuzmanis. Dragon Looks at the Sky ; K.Salmiņš. On ILRS Technical Workshop 2017 in Riga ; CONFERENCES and MEETINGS: M.Sudārs. Trends of Space Infrastructure Development in Europe ; M.Gills. Congress of European Planetary Science 2017 in Riga ; FLASHBACK: N.Cimahoviča. On Whirl…
Diversità nei luoghi: condizioni da esplorare
2012
Contributo scientifico sulla diversità dei luoghi in relazione alla definizione di “Progetto” quale connotazione imprescindibile della sua natura disciplinare nell’ambito della ricerca Turismo Relazionale Integrato, per il progetto regionale e internazionale MOTRIS II. Curato dal Collegio Universitario ARCES con il supporto scientifico del Centro Ricerche nuovo Umanesimo Edoardo Caracciolo (CRUEC).
Cytotoxic Action of Serratia marcescens Hemolysin on Human Epithelial Cells
1999
ABSTRACT Incubation of human epithelial cells with nanomolar concentrations of chromatographically purified Serratia marcescens hemolysin (ShlA) caused irreversible vacuolation and subsequent lysis of the cells. Vacuolation differed from vacuole formation by Helicobacter pylori VacA. Sublytic doses of ShlA led to a reversible depletion of intracellular ATP. Restoration to the initial ATP level was presumably due to the repair of the toxin damage and was inhibited by cycloheximide. Pores formed in epithelial cells and fibroblasts without disruption of the plasma membrane, and the pores appeared to be considerably smaller than those observed in artificial lipid membranes and in erythrocytes a…
Experimental investigation and modeling of diffusion dialysis for HCl recovery from waste pickling solution
2019
Abstract Hydrochloric acid recovery from pickling solutions was studied by employing a batch diffusion dialysis (DD) laboratory test-rig equipped with Fumasep membranes. The effect of main operating parameters such as HCl concentration (0.1–3 M) and the presence of Fe2+ (up to 150 g/l) was investigated to simulate the system operation with real industrial streams. The variation of HCl, Fe2+ and water flux was identified. When only HCl is present, a recovery efficiency of 100% was reached. In the presence of FeCl2, higher acid recovery efficiencies, up to 150%, were observed due to the so-called “salt effect”, which promotes the passage of acid even against its concentration gradient. A 7% l…
Desiccation and osmotic stress increase the abundance of mRNA of the tonoplast aquaporin BobTIP26-1 in cauliflower cells.
1999
Changes in vacuolar structure and the expression at the RNA level of a tonoplast aquaporin (BobTIP26-1) were examined in cauliflower (Brassicaoleracea L. var. botrytis) under water-stress conditions. Gradual drying out of slices of cauliflower floret tissue caused its collapse, with a shrinkage in tissue and cell volumes and an apparent vesiculation of the central vacuole, whereas osmotic stress resulted in plasmolysis with a collapse of the cytoplasm and the central vacuole within. Osmotic stress caused a rapid and substantial increase in BobTIP26 mRNA in slices of floret tissue. Exposure of tissue slices to a regime of desiccation showed a slower but equally large rise in BobTIP26 mRNA fo…