Elemental sulfur is insoluble in water and accumulates in the packing material in biotrickling filters, increasing the pressure drop and operating costs. A set of mass transfer tests was performed in a versatile pilot plant to supply the necessary oxygen for the biological oxidation of H2S. The plant can be operated with three different commercial gasliquid contactor devices: a venturi ejector, a jet-venturi and a diffuser. The effects of different geometric www.selleckchem.com/products/azd8186.html and operating parameters have been tested for each device (including pressure rise and sulfate
content to mimic real wastewater treatment plant conditions). RESULTS: Results showed that the bioreactor pressure has a strong influence on the mass transfer characteristics of the three oxygenation devices. In addition, the ionic strength of the solution has a low influence on the mass transfer process. The SOTE values obtained for the diffuser, jet-venturi and venturi ejector were 8.7%, 7.2% and 6.0%, respectively (pure water experiments), while SAE values were in the range 6.35.5
x 10(-2), 4.1-4.8 x 10(-1) and 3.1-3.7 x 10(-1) kg O-2 kW(-1) h(-1), respectively. CONCLUSIONS: The jet-venturi offers the best oxygen transfer with lower power consumption compared with the diffuser and venturi ejector. The practical implementation of the most efficient aeration technology is possible from both technical and economical perspectives. Copyright
(c) 2012 Society of Chemical Industry”
“Introduction: selleck chemicals Pendrin is an integral membrane protein and plays a key role in extracellular fluid volume and blood pressure control. We aimed to investigate the relationship between pendrin immunostaining intensity in normal and pre-eclamptic placental tissue.
Methods: Fifty-six placental tissues, of which 26 were in pre-eclamptic, and 30 were in control group were evaluated by immunohistochemical staining. Positive immunostaining was evaluated using a semiquantitative score: 0, negative; +, mild; ++, moderate; and +++, intense.
Results: There was more positive immunstaining in the pre-eclamptic placenta compared to the controls (p<0.001). A significant positive correlation was observed between buy RO4929097 immunostaining level and diastolic blood pressure (r = 0.533, p = 0.005) in the pre-eclamptic group. However, no significant correlation was observed between any condition and immunostaining level in the control group.
Conclusions: Placentas in the pre-eclamptic group were significantly more immunostained with pendrin than were those in the control group. In addition, a positive correlation between immunostaining intensity with pendrin and both systolic and diastolic blood pressure were observed. Pendrin may play a role in the mechanism of severe hypertension in women with pre-eclampsia.