Hydrolytic Behavior of Th4+, UO22+, and Ce3+ Ions at Various Temperatures

WOS: 000265073600004The hydrolytic behavior of Th4+, UO22+, and Ce3+ was investigated using the potentiometric method at elevated temperatures in KCl medium. For each metal ion, stability constants were obtained from the pH-metric data using the program HYPERQUAD2006. The formation of [Th(OH)](3+), [Th(OH)(2)](2+), [Th(OH)(3)](+), Th(OH)(4), [Th-4(OH)(8)](8+), and [Th-6(OH)(15)](9+) for the thorium ion, [UO2(OH)](+), [(UO2)(2)(OH)(2)](2+), [(UO2)(3)(OH)(4)](2+), and [(UO2)(3)(OH)(5)](+) for the uranyl ion, and [Ce-2(OH)](5+), [Ce-2(OH)(2)](4+), Ce(OH)(3), and [Ce-2(OH)(5)](+) for the cerium ion was taken into consideration. In addition, the effect of temperature on the stability constants was studied, and thermodynamic parameters were derived and discussed.Ege University Research FundEge University [2004 NBE 001]Financial Support is provided by Ege University Research Fund (contract no. 2004 NBE 001)

The role of calcium utilization of intestinal flora in urinary calcium excretion

WOS: 000244883600007PubMed ID: 17321955Objective: We aimed to evaluate whether Ca+2 Utilization of intestinal flora (IF) has an effect on urinary excretion of Ca+2 (UCaE) levels. Materials and Methods: Fecal samples (0.1 g/mL) of children who underwent UCaE examination in the past year were implanted in broths. Labeled Ca-45 (5 mu L) was added to the samples and incubated. From these samples, a 200-mu L quantity was filtrated with a 0.45-micrometer membrane and was rinsed in 200 mu L pure water. Ca-45 activity in the membrane was measured and defined as percent activity per bacteria (Ca-45(act) %/CFU). Levels of aerobic and anaerobic Ca-45(act) %/CFU and their correlations with UCaE were compared between hypercalciuric (Group I) and normocalciuric (Group II) patients. Results: Levels of Ca-45 %/CFU were similar between groups (P >.05). Aerobic and anaerobic Ca-45(act)%/CFU levels were not significantly correlated to UCaE, either in normocalciuric (P=.079, r = -0.503; P=.260, r = -0.420, stray mart respectively) or in hypercalciuric children (P =.509, r = 0.223; P =.623, r = -0.257, respectively). Conclusion: Similar Ca-45(act)%/CFU levels in the 2 groups imply that calcium utilization of IF does not have a distinct effect on UCaE. (C) 2007 by the National Kidney Foundation, Inc