3 and molar ratio = 2, less than 0.5 mu g L-1 of selenium(IV) remained in solution after reduction. The reductive precipitation reaction started as soon as the stannous ions were added to the selenium-bearing solution and was completed in less than 5 min. The reaction products, characterized using X-ray diffraction, check details electron microscopy, particle and surface area measurements, X-ray photoelectron spectroscopy and chemical analysis, were composed of approximately equal amounts of tin selenide and tin dioxide. In addition to tin selenide a minor amount of selenium(IV) was found to be removed via adsorption on the tin
dioxide formed in situ. Tests with a complex industrial solution also resulted in full and stable selenium precipitation. CONCLUSION: Stannous ions were found to be very effective in removing selenious ions from synthetic and industrial solutions, producing very stable precipitates. Copyright (c) 2012 Society of Chemical Industry”
“Objective: To describe the impact of previous cervical surgery on preterm birth prior to 34 weeks in twins.
Methods: A retrospective review of twin pregnancies delivered between January 1998 and
December 2005 at two institutions was performed. Women with a prior cold knife cone (CKC), loop electrosurgical excision procedure (LEEP), or ablative procedure were compared to a control group of women who had not undergone a previous treatment for cervical dysplasia. The primary outcome was delivery before 34 weeks of gestation.
Results: A total of 876 women met inclusion criteria. Of these, 110 (12.6%) had BMS-754807 in vitro previous surgical procedures for cervical Quisinostat mw dysplasia, including CKC (n = 10), LEEP (n = 36), cryotherapy (n = 59) and CO2 laser treatment (n = 5). Delivery prior to 34 weeks was more common in women with a previous CKC compared to women with no prior treatment (40% versus
11.3%; odds ratio [OR], 3.6; 95% confidence interval [CI], 1.7-8.0). Delivery prior to 34 weeks was not more common in women with a previous LEEP (8.3%; OR, 0.8; 95% CI, 0.3-2.3) or ablative procedure (9.4%; OR, 0.9; 95% CI, 0.4-1.9) in comparison to the untreated group. Adjusting for the potential confounders of age, tobacco use, infertility treatments and previous preterm birth did not change the results.
Conclusions: Previous CKC is associated with delivery prior to 34 weeks while LEEP and ablative procedures are not. CKC should be carefully considered and avoided when possible in reproductive age women.”
“P>Background:
Pain, anxiety and fear of needles make intravenous cannulation extremely difficult in children. We assessed the efficacy and safety of oral midazolam and a low-dose combination of midazolam and ketamine to reduce the stress and anxiety during intravenous cannulation in children undergoing computed tomography (CT) imaging when compared to placebo.
Methods:
Ninety-two ASA I or II children (1-5 years) scheduled for CT imaging under sedation were studied.