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2 results on '"Pulsed laser deposition"'

1. Applied Research Note: Pulsed-field gel electrophoresis and antimicrobial resistance profiles of Campylobacter jejuni isolated from Brazilian broiler farms.

Author

Vaz, C. S. L., Voss-Rech, D., Lopes, L. S., and Silva, V. S.

Subjects
*POULTRY farms, *PULSED-field gel electrophoresis, *CAMPYLOBACTER jejuni, *GEL electrophoresis, *DRUG resistance in microorganisms, *CAMPYLOBACTER, *PULSED laser deposition
Abstract

We studied the on-farm variety of thermotolerant Campylobacter strains isolated from field samples received over a 12-mo period from four broiler-producing companies in southern Brazil. In total, 515 of 807 (63.8%) of analyzed samples were found to be Campylobacter-positive. Campylobacter jejuni and C. coli were detected; the first one being more frequently isolated (98.2%). The highest antimicrobial resistance levels in a subset of 80 C. jejuni strains were found against enrofloxacin (89.5%) and ciprofloxacin (83.3%). Most of the 28 DNA macrorestriction profiles identified in C. jejuni were unique to each sampled broiler company. Genetically related C. jejuni populations were detected on different broiler farms integrated to the same company on different sampling occasions. Undistinguished strains were found in the indoor environment and in broilers on the same farm. The finding of recurrent strains on integrated farms suggests that particular factors or management practices may play a role in the dispersion or carry-over of C. jejuni in the studied broiler companies. [ABSTRACT FROM AUTHOR]

Published
2021
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2. 2-D Airbreathing Lightcraft Engine Experiments in Quiescent Conditions.

Author

Salvador, Israel I., Myrabo, Leik N., Minucci, Marco A. S., de Oliveira, Antonio C., Toro, Paulo G. P., Chanes, José B., and Rego, Israel S.

Subjects
*AIRBREATHING launch vehicles, *HYPERSONIC aerodynamics, *PULSED laser deposition, *PROPULSION systems, *SPIN-spin interactions, *MATHEMATICAL models
Abstract

Ground-breaking laser propulsion (LP) experiments were performed under quiescent conditions with a 25 cm wide, two-dimensional Lightcraft model using a Lumonics TEA-622 CO2 laser emitting ∼ 1 μs pulses. In preparation for subsequent hypersonic experiments, this static test campaign was conducted at ambient pressures of 0.06, 0.15, 0.30 and 1 bar with laser pulse energies of 150 to 230 J. Time-variant pressure distributions, generated over engine 'absorption chamber' walls, were integrated to obtain total impulse and momentum coupling coefficients (Cm) representative of a single propulsion cycle. Schlieren visualization of laser-induced air breakdown and expanding blast waves was also accomplished. Surprisingly, the Cm results of 600-3000 Ns/MJ were 2.5x to 5x greater than previous results from smaller Lightcraft models; this suggests that higher static Cm performance can likely be achieved in larger scale LP engines. This research collaboration, forged between the USAF and Brazilian Air Force, was carried out at the Henry T. Nagamatsu Laboratory of Aerothermodynamics and Hypersonics in Brazil. [ABSTRACT FROM AUTHOR]

Published
2011
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