Air Dissolution
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Analysis of the surface quality of sulphur-coated urea particles in a two-dimensional spouted bed
In this work the quality of sulphur-coated urea was determined by the urea dissolution rate and analysed by electron microscopy. Particles of urea were coated in a two-dimensional spouted bed, having a 60° slanted base angle and an atomization nozzle installed at the base. Elementary sulphur was liquefied and atomized on the particles. The experiments were
Brazilian Journal of Chemical Engineering. Publicado em: 2001-03
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14. Efeito do tratamento superficial na devitrificação e dissolução da silica vitrea / Effect of surface treatment on devitrification and dissolution of vitreous silica
The effect of surface stress and roughness, produced by polishing process with abrasive powder, was investigated on the devitrification and dissolution of silica glass. The characterization studies of the silica glass treated by grinding, polishing and etching and their effect on the devitrification were conducted by X-ray diffraction, optical and electronic
Publicado em: 1997
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15. Collapse of Water-Stress Emboli in the Tracheids of Thuja occidentalis L.
We report the kinetics of embolus formation and collapse in the tracheids of Thuja occidentalis L. stem segments. Radial wood sections were trimmed to 4 mm long paralleling the tracheids by 1 mm wide and 0.1 mm thick. They were observed under a dissecting microscope at 128x while sections were dehydrated and rehydrated. During dehydration, cavitations result
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16. Detection of Mycoplasma hyopneumoniae by Air Sampling with a Nested PCR Assay
This article describes the first successful detection of airborne Mycoplasma hyopneumoniae under experimental and field conditions with a new nested PCR assay. Air was sampled with polyethersulfone membranes (pore size, 0.2 μm) mounted in filter holders. Filters were processed by dissolution and direct extraction of DNA for PCR analysis. For the PCR, two ne
American Society for Microbiology.
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17. Comparison between gamma and beta irradiation effects on hydroxypropylmethylcellulose and gelatin hard capsules
The effects of electron beam or λ-irradiation on technological performances (capsule hardness, expressed as deforming work and dissolution time) of empty 2-shell capsules made of gelatin or hydroxypropylmethylcellulose (HPMC) were studied. Capsule structural changes induced by radiation treatment were investigated by capillary viscometry and atomic force mi
Springer-Verlag.
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18. Anomalies in coral reef community metabolism and their potential importance in the reef CO2 source-sink debate
It is not certain whether coral reefs are sources of or sinks for atmospheric CO2. Air–sea exchange of CO2 over reefs has been measured directly and inferred from changes in the seawater carbonate equilibrium. Such measurements have provided conflicting results. We provide community metabolic data that indicate that large changes in CO2 concentration can o
The National Academy of Sciences.
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19. Effect of Plasticizer on Release Kinetics of Diclofenac Sodium Pellets Coated with Eudragit RS 30 D
The present study was designed to investigate the effect of two plasticizers, i.e., triethyl citrate (TEC) and polyethylene glycol 6000 (PEG 6000) on the in vitro release kinetics of diclofenac sodium from sustained-release pellets. Ammonio methacrylate copolymer type B (Eudragit RS 30 D) is used as the release-retarding polymer. Both plasticizers were used
Springer US.
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20. Interfacial Self-Assembly of a Fungal Hydrophobin into a Hydrophobic Rodlet Layer.
The Sc3p hydrophobin of the basidiomycete Schizophyllum commune is a small hydrophobic protein (100 to 101 amino acids) containing eight cysteine residues. Large amounts of the protein are excreted into the culture medium as monomers, but in the walls of aerial hyphae, the protein is present as an SDS-insoluble complex. In this study, we show that the Sc3p h
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21. Study of coat quality of tablets coated by an on-line supercell coater
The aim of this study was to investigate the nature of Supercell coating, an on-line tablet coater that employed a unique pattern of airflow. Tablets coated at different spray rates (4, 6, 8, 10, and 12 mL/min) were analyzed to investigate the influence of different wetting conditions on the quality of coats formed. Scanning electron micrographs showed that
Springer-Verlag.
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22. alpha-Radiation dose at bronchial bifurcations of smokers from indoor exposure to radon progeny.
Synergistic interactions of indoor radon progeny with the cigarette smoking process have been evaluated experimentally. Smoking enhances the air concentration of submicron particles and attached radon decay products. Fractionation in burning cigarettes gives rise to the association of radon progeny with large particles in mainstream cigarette smoke, which ar
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23. Kinetic Analysis of Phospholipase C from Catharanthus roseus Transformed Roots Using Different Assays1
The properties of phospholipase C (PLC) partially purified from Catharanthus roseus transformed roots were analyzed using substrate lipids dispersed in phospholipid vesicles, phospholipid-detergent mixed micelles, and phospholipid monolayers spread at an air-water interface. Using [33P]phosphatidylinositol 4,5-bisphosphate (PIP2) of high specific radioactivi
American Society of Plant Physiologists.
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24. Deposition, retention, and clearance of inhaled particles.
The relation between the concentrations and characteristics of air contaminants in the work place and the resultant toxic doses and potential hazards after their inhalation depends greatly on their patterns of deposition and the rates and pathways for their clearance from the deposition sites. The distribution of the deposition sites of inhaled particles is