Synthesis of PVP-capped trimetallic nanoparticles and their efficient catalytic degradation of organic dyes.

The study proposes a simple and efficient way to synthesize a heterogeneous catalyst that can be used for the degradation of organic dyes. A simple and fast chemical process was employed to synthesize Au: Ni: Co tri-metal nanohybrid structures, which were used as a catalyst to eliminate toxic organic dye contamination from wastewater in textile industries. The catalyst's performance was tested by degrading individual dyes as well as mixtures of dyes such as methylene blue (MB), methyl orange (MO), methyl red (MR), and Rose Bengal (RB) at various time intervals. The experimental results show the catalytic high degradation efficiency of different dyes achieving 72-90% rates in 29 s. Moreover, the material displayed excellent recycling stability, maintaining its degradation efficiency over four consecutive runs without any degradation in performance. Overall, the findings of the study suggest that these materials possess efficient catalytic properties, opening avenues toward their use in clean energy alternatives, environmental remediation, and other biological applications.

Perinatal outcome and near-miss morbidity between placenta previa versus abruptio placentae.

OBJECTIVE: To compare perinatal outcome and near-miss morbidities between placenta previa versus abruptio placentae in patients of antepartum haemorrhage (APH). STUDY DESIGN: Cross-sectional, analytical study. PLACE AND DURATION OF STUDY: Gynaecology Unit II, Civil Hospital, Karachi, from August 2007 to July 2009. METHODOLOGY: Patients with APH diagnosed as placenta previa and abruptio placentae who delivered after 24 weeks of pregnancy were selected from labour room. Outcome measures were birth weight, neonatal intensive care admission, stillbirth, perinatal mortality rates, near-miss, surgical intensive care admission, postpartum haemorrhage, hysterectomy, massive transfusion, renal failure, coagulopathy and maternal death. Stillbirth was defined as a fetus weighing≥500 gm showing no sign of life after birth. Near-miss was defined as severe organ dysfunction which if not treated appropriately, could result in death. Descriptive statistics were calculated and chi-square was applied with significance level<0.05. RESULTS: Stillbirths and perinatal mortality rates were significantly higher in abruptio placentae, 52.97% versus 18.18% and 534/1000 versus 230/1000 (p<0.01). Near-miss cases were also significantly higher in abruptio placentae, 22.27% verus 11.18% (p<0.01). Hypovolemic shock and coagulation failure were also significantly higher in abruptio placentae (p<0.05). CONCLUSION: Abruptio placentae carry significantly higher perinatal mortality and near-miss morbidity than placenta previa.