Ventilator-associated pneumonia (VAP) has been described in humans and in experimental animals. The most severe lesions are located in dependent lung segments along a sterno-vertebral axis, however the cephalocaudal distribution of lung infection remains unknown. We used an experimental model to evaluate the distribution of lung infection, considering its anteroposterior and cephalocaudal gradi...

The locally isolated filamentous fungus Cunninghamella bainieri 2A1 was cultivated in a 5 L bioreactor to produce lipid and gamma-linolenic acid (GLA). The optimization was carried out using response surface methodology based on a central composite design. A statistical model, second-order polynomial model, was adjusted to the experimental data to evaluate the effect of key operating variables,...

The effects of temperature, agitation and aeration on glycoprotein GP-1 production by Streptomyces kanasenisi ZX01 in bench-scale fermentors were systematically investigated. The maximum final GP-1 production was achieved at an agitation speed of 200 rpm, aeration rate of 2.0 vvm and temperature of 30 °C. By using a dynamic gassing out method, the effects of agitation and aeration on volumetric...

Agitation was a significant factor in achieving the high performance of electrocoagulation (EC) system. Three EC systems with four parellal monopolar Al electrodes were established to clarify influence agitation methods on pollutants removal efficiency; magnetic stirring, continuous aeration, and combination stirring aeration. The aim this work maximize industrial wastewater treatment short det...

Lubricating oils get aerated during their use, reducing efficiency and stability. Deaerating agents are generally added to reduce aeration. Understanding the mechanisms by which these additives set gas fraction in oil is crucial for development of optimal formulation. Here we present experiments performed on a Flender test apparatus ultrasonic probes incorporated. We technique demonstrate that ...

Sediment microbial fuel cells (SMFCs) are a promising technology for a viable source of energy. This technology is faced with many challenges, such as limited mass transfer and low electricity generation. The aim of this research was to investigate the effect of electrolyte conductivity and aeration effect on power generation from SMFCs. Electrical conductivity was adjusted at 6different levels...

Rapidly growing aerobic organisms can deplete oxygen in the nutrient medium even when culture vessels are open to the air. Agitation is beneficial under these conditions because it tends to expose more liquid to the air, and because the mixing tends to make conditions more homogeneous throughout the volume of the medium. Rotary and reciprocating shakers are capable of high rates of aeration whe...

For the successful operation of aerobic fermentations it is essential to supply the microorganiisms with sufficient oxygen to meet their requirements at any stage in the process. Failure to supply enough oxygen may lead to undesirable changes in enzymatic makeup (Rolinson, 1952) or death of the organisms (Hromatka et al., 1951), with a subsequent lower yield of the desired product. In general, ...

In this paper, reactivation of microalgal-bacterial granular sludge (MBGS) stored at ?20 °C for 6 months was investigated under respective aeration (R1) and non-aeration (R2) conditions. Results showed that the activity could be fully recovered within 21 days. The average removal efficiency ammonia higher in R1 (92.78%), while R2 efficiencies organics (84.97%) phosphorus (85.28%). It also found...

The article considers design options for light-aeration lamps used in “cold” barns. Calculations were made of volumetric airflow rates through an open-type ridge at different heights inlet openings, the results which are presented article.
 Keywords: aeration; barn; natural ventilation; microclimate; air exchange.