Adsorption behavior and thus performance of the terpolymers strongly depend on their calcium binding capacity. Ca(2+) selective conductivity measurements show that the AMPPA modified terpolymer chelates less calcium than the VPA polymer. Therefore, it interacts https://www.selleckchem.com/ATM.html less with surfaces containing calcium atoms/ions. To investigate the consequences for practical applications adsorbed amounts on cement surface and effectiveness as water retention agent (fluid loss additive, FLA) in oil well cement slurries with and without acetone-formaldehyde-sulfite (AFS) dispersant were determined. CaAMPS-co-NNDMA-co-CaAMPPA

and AFS adsorb simultaneously whereas CaAMPS-co-NNDMA-co-CaVPA does not allow dispersant adsorption. The reason is that affinity of phosphonate functions towards Ca(2+) ions is reduced with increasing distance from the polymer backbone. Thus, AMPPA is a weaker anchor group than VPA. Zeta potential measurements indicate that the selleck chemicals llc increased length of the side chain holding the phosphonate function decreases the anionic charge density of the polymer. Accordingly, CaAMPS-co-NNDMA-co-CaAMPPA appears to develop weaker bonds with the cement surface. Upon addition of AFS, the AMPPA modified FLA can change its adsorbed conformation from

“”train”" to “”loop”" or “”tail”" mode and thus provide

space for the dispersant to adsorb as well. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 115: 1758-1768, 2010″
“India remains endemic for both vivax malaria and tuberculosis. Daporinad datasheet In spite of the high burden of tuberculosis in the country, reports on congenital tuberculosis in the literature are limited. We report herein an unusual instance of co-occurrence of perinatal falciparum malaria and tuberculosis in a 34-day-old female newborn, who presented with symptoms of sepsis. The diagnosis was based on the demonstration of Plasmodium falciparum on peripheral blood smear and tubercle bacilli in gastric aspirate samples. The maternal history for falciparum malaria was positive during her eighth month of pregnancy and the father was an open case of sputum smear-positive pulmonary tuberculosis. She responded dramatically to combined antimalarial and antitubercular chemotherapy. A search for combined etiologies in presumed ‘sepsis’ in the newborn, guided by history, physical examination, and laboratory investigations, is warranted. (C) 2009 International Society for Infectious Diseases. Published by Elsevier Ltd. All rights reserved.”
“Objective. The present study evaluated the dynamics of the development of periapical lesions.

Study design.