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Objective To investigate the perinatal complications, complications and prognosis of HIV parturient women treated with long-term high efficiency antiretroviral therapy. Methods We collected clinical basic information of 105 cases of long-term effective antiretroviral therapy (ART) >1 year of maternal HIV, in Department of Obstetrics, Guangxi Zhuang Autonomous Region Hepu County People's Hospital (69 cases) and Department of Obstetrics, Guangxi Maternal and Child Health Hospital (36 cases) treated in January 2016-January 2020, and randomly selected 105 cases of exclude HIV infections and childbirth age pregnant women in the two hospitals (70 cases and 35 cases) at the same time as control group, compared and analyzed two groups of perinatal maternal obstetric complications, complications, and pregnancy outcomes. Results The rates of anemia (29 cases, 27.6%), gestational hypertension (33, 31.4%), intrauterine stillbirth (10, 9.5%), polyhydramnios (23, 21.9%), premature rupture of membranes (17, 16.2%), postpartum hemorrhage (20, 19.0%) and placental abruption (15, 14.3%) in HIV parturient women were significantly higher than those in normal parturient women (P<0.05). The weight of newborn (3 313.18±216.14) g in HIV parturient women was significantly lower than that of normal parous (3 395.88±195.45) g (P<0.05); incidence of preterm birth (15, 14.3%), fetal distress (16, 15.2%), malposition (16, 15.2%), the incidence rate of amniotic fluid dung dye (23, 21.9%) and Apgar<5 points (16, 15.2%), neonatal ICU hospitalization rates (22, 21.0%), the incidence of neonatal pneumonia (17, 16.2%) in HIV parturient women were significantly higher than that in normal women (P<0.05). Conclusion HIV patients treated with long-term high performance antiretroviral therapy have more perinatal complications and complications, lower birth weight and more complications, but contribute to improve neonatal mortality. [ABSTRACT FROM AUTHOR]

An anion exchanger from rice straw was used to remove Cr (VI) from synthetic wastewater and electroplating effluent. The exchanger was characterized using Fourier transform infrared (FTIR) spectrum and scanning electron microscopy (SEM), and it was found that the quaternary amino group and hydroxyl group are the main functional groups on the fibrous surface of the exchanger. The effect of contact time, initial concentration and pH on the removal of Cr (VI), and adsorption isotherms at different temperature, was investigated. The results showed that the removal of Cr (VI) was very rapid and was significantly affected by the initial pH of the solution. Although acidic conditions (pH=2−− 6) facilitated Cr (VI) adsorption, the exchanger was effective in neutral solution and even under weak base conditions. The equilibrium data fitted well with Langmuir adsorption model, and the maximum Cr (VI) adsorption capacities at pH 6.4 were 0.35, 0.36 and 0.38 mmol/g for 15, 25 and 35°C, respectively. The exchanger was finally tested with real electroplating wastewater, and at sorbent dosage of 10 g/L, the removal efficiencies for Cr (VI) and total Cr were 99.4% and 97.8%, respectively. In addition, the positive relationship between adsorbed Cr (VI) and desorbed Cl−suggested that Cr (VI) was mainly removed by ion exchange with chlorine. [ABSTRACT FROM PUBLISHER]

Quantitative structure–property relationship (QSPR) modeling is a powerful approach for predicting environmental behavior of organic pollutants with their structure descriptors. This study reports an optimal QSPR model for estimating logarithmic soil sorption coefficients (log KOC) of polycyclic aromatic hydrocarbons (PAHs). Quantum chemical descriptors computed using density functional theory at the B3LYP/6-31G(d) level and partial least squares (PLS) analysis with an optimizing procedure were used to generate QSPR models for log KOC of PAHs. The correlation coefficient of the optimal model was 0.993, and the results of a cross-validation test ($Q_{\rm cum}^{2} = 0.937$) showed this optimal model had high fitting precision and good predicting ability. The log KOC values predicted by the optimal model are very close to those observed. The PLS analysis indicated that PAHs with larger electronic spatial extent tend to more easily adsorb and accumulate in soils and sediments, whereas those with higher molecular total energy and larger energy gap between the lowest unoccupied and the highest occupied molecular orbital adsorb and accumulate in soils and sediments less readily. [ABSTRACT FROM AUTHOR]