The pathogenesis of alveolitis is not well known and therefore experimental
situations that mimic some features of this disease should be developed.ObjectiveIn this study, the evolution of the experimentally induced infection in rat
sockets is characterized, which leads to clinical signs of suppurative alveolitis
with remarkable wound healing disturbs.Material and methodsNon-infected (Group I) and experimentally infected sockets in Rattus
novergicus (Group II) were histometrically evaluated regarding the
kinetics of alveolar healing. In addition, the characterization of the present
bacteria in inoculation material and the serum levels of C-reactive protein (CRP)
were performed. The detected species were Capnocytophaga ochracea,
Fusobacterium nucleatum ss nucleatum, Prevotella melaninogenica, Streptococcus
anginosus, Treponema socranskii and Streptococcus
sanguis.ResultsAll experimentally infected rats developed suppurative alveolitis, showing higher
levels of CRP in comparison to those non-infected ones. Furthermore, infected rats
presented a significant delayed wound healing as measured by the histometric
analysis (higher persistent polymorphonuclear infiltrate and lower density of
newly formed bone).ConclusionThese findings indicate that rat sockets with experimentally induced infection
produced higher levels of serum CRP, showing the potential of disseminated
infection and a disturb in the alveolar repair process in an interesting
experimental model for alveolitis studies.
This work aims at a performance evaluation of atmospheric BIGCC (biomass integrated gasifier combined cycle) systems operating under different strategies for the use of low calorific fuel in gas turbines. The fuel is a synthetic gas derived from gasification of sugar cane residues. Two analysed strategies for surge control on gas turbines originally designed for operation on natural gas are de-rating and air extraction from the compressor. Another strategy for use of biomass derived gas is the retrofit of a gas turbine through modification of the expander geometry. Three generic gas turbines, whose main parameters have been taken from off the shelf machines, are proposed as representative of certain classes of gas turbines. Results are compared to the hypothetical situation in which it is possible to accept any increase in gas turbine pressure ratio. According to the results, de-rating is the worst surge control strategy, both from the point of view of power production and thermal efficiency. Conversely, results showed considerable gains that can be obtained on cycle power production when the gas turbine expander is modified. Additionally, an overview of issues concerning the suitability of sugar cane residues (bagasse and trash) for the production of gasified gas and its use in BIGCC plants is presented.
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