AIMS To investigate the effect of total air pressure raise on cell growth and intracellular beta-galactosidase activity in batch cultures of Kluyveromyces marxianus CBS 7894. METHODS AND RESULTS A pressurized bioreactor was used for K. marxianus batch cultivation under increased air pressure from 1.2 to 6 bar. Under these conditions no inhibition of cell growth was observed. Moreover, the imp...

Abstract To compute the maximum speed threshold for helicopters, we model lift produced by rotor blades. Using this model, derive limits each method traditionally used to alleviate dissymmetry of lift. Additionally, find minimum angular velocity required produce a prescribed at given forward velocity. We conditions on coefficient helicopter airfoils that maintain altitude. Further consideration...

Limited available water resources have rendered wastewater reuse an important issue to specialists in most developed countries, today. The current study works on membrane filtration for treatment of industrial wastewater. By comparing the two methods of membrane bioreactor (MBR) and hybrid membrane electro bioreactor (MEBR) processes, it finds that earlier fouling in the membrane occurs in the ...

An air lift pump is a type of that works by injecting into the bottom channel containing water, position vertical, because has specific gravity smaller than will move upwards to form bubbles, bubbles water. so water flows with it. This study uses an unit, injector diameters used are 6 mm, 8 and 10 mm. Variations in diameter 21 31 41 The length 500 submerged 150 flow rate 5 lt/min. research time...

The flame stability limit, which was involving the critical flow condition, lift off and blow out, could be affected by the burner geometry in the combustion system installation. Consequently a flame holder should be put in, to hold the flame as big as possible on a stable condition. The flame holder itself, is a device to hold the flame, whereas the flame holder could disturb the air and fuel ...