Background This paper investigated how second- and third-trimester gestational weight gain relates to perinatal outcomes among normal weight women with twin pregnancies in Fujian, China. Methods A retrospective study examining the medical records of 931 normal weight twin-pregnant women was conducted in Fujian Maternity and Child Health Hospital from 2014 to 2018.The 2nd and 3rdtrimester weekly weight gain rates were calculated, and women were categorized as gaining below, within, or above the 2009 Institute of Medicine (IOM) recommended rates. The association between the trimester-specific weight gain rate and perinatal outcome was determined by traditional regression analysis among groups. Results A total of 25.9%, 19.8% and 54.3% of women had rates of weight gain across the 2nd and 3rd trimesters less than, greater than or within the recommended rates respectively. Multivariate logistic regression analysis showed that weight gain greater than the recommended rate in the 2nd trimester was associated with a decreased risk of preeclampsia (aOR:0.489,95%CI:0.289 ~ 0.974). Weight gain less than the recommended rate of weight gain in the 3rd trimester was associated with increased risks of premature delivery(aOR:2.079, 95%CI:1.467 ~ 2.968), gestational diabetes mellitus (aOR: 2.048, 95%CI:1.411 ~ 2.971), intrahepatic cholestasis syndrome (aOR:3.015,95%CI: 1.058 ~ 8.587), pre-labour rupture of membrane (aOR: 1.708,95%CI: 1.169 ~ 2.493), average twin birth weight < 2500 g(aOR:1.532,95%CI: 1.125 ~ 2.084) and neonatal respiratory distress syndrome (aOR:4.934,95%CI:1.626 ~ 15.083) and was associated with decreased risks of caesarean section (aOR:0.589,95%CI:0.386 ~ 0.898) and preeclampsia (aOR:0.471, 95%CI:0.274 ~ 0.808). In addition, weight gain greater than the recommended rate of weight gain in the 3rd trimester was associated with increased risks of premature delivery (aOR:1.589,95%CI:1.428 ~ 2.951) and gestational hypertension (aOR:2.137,95% CI:1.034 ~ 4.415) as well as preeclampsia (aOR:2.246, 95%CI:1.462 ~ 3.452). The stratified analysis of weight gain in the 3rd trimester showed that there was no significant difference in the incidence of adverse pregnancy outcomes compared to the 2nd trimester weight gain groups. Conclusions While this study showed that a gestational weight gain rate above or below the recommendation in the 3rd trimester was associated with some adverse maternal and neonatal outcomes, further prospective and multicentre studies are required to explore alternate ranges of gestational weight gain rates in twin pregnancies.

Two camptothecin derivatives, 10-cyclohexyl-7-methyl-20(S)-camptothecin and 7-methyl-10-morpholino-20(S)-camptothecin, were synthesized and their differences in solubility were investigated using four chosen solvent systems. Based on our results, 10-cyclohexyl-7-methyl-20(S)-camptothecin exhibited higher solubilities than 7-methyl-10-morpholino-20(S)-camptothecin in polar aprotic solvents. However, these two camptothecin derivatives did not exhibit apparent differences in solubility between 5% dimethyl sulfoxide (DMSO)/95% normal saline co-solvent system and 5% dimethylacetamide (DMAC)/95% normal saline co-solvent system. To rationalize their differences in solubility, we also tried to perform a DFT-B3LYP study to investigate their interaction with one water molecule.

Background: This paper investigated how second and third trimester gestational weight gain relates toperinatal outcomes among normal weight women with twin pregnancies in Fujian, China. Methods: A retrospective study on the medical records of 931 normal weight twin pregant women was conducted in Fujian Maternity and Child Health Hospital from 2014 to 2018.The 2nd and 3rd trimester weekly weight gain rate were calculated and categorized women as gaining below, within, or above the 2009 Institute of Medicine (IOM) recommended rates . The association between trimester-specific weight gain rate and perinatal outcome was performed by traditional regression analysis among groups.Results:A total of 931 pregnant women and 1862 neonates were included for analysis. 25.9% ,19.8% and 54.3%% of women had less than, greater than and within the recommended rates of gain in the 2nd and 3rd trimester, respectively. Multivariate Logistic regression analysis showed that greater than recommended rates of weight gain in 2nd trimester decreased the risks of preeclampsia (adjusted OR:0.458,95% CI:0.255~0.824). Less than recommended rates of weight gain in 3rd trimester increased the risk of premature delivery（adjusted OR=1.926,95%CI:1.403~2.644）, gestational diabetes mellitus (adjusted OR = 2.052,95%CI:1.417~2.972), intrahepatic cholestasis syndrome (adjusted OR = 3.016,95%CI:1.057~8.606), premature rupture of the membrane (adjusted OR = 1.722,95%CI:1.180~2.512) and neonatal respiratory distress syndrome (adjusted OR = 5.135,95%CI:1.701~15.498) and decreased the risk of cesarean section (adjusted OR = 0.587,95%CI:0.385~0.893) .In addition, greater than recommended rates of weight gain in 3rd trimester was associated with increased risks in premature delivery (adjusted OR=1.818,95%CI:1.307~2.527), and gestational hypertension (adjusted OR=2.098,95%CI:1.018~4.324) as well as preeclampsia(adjusted OR:2.029, 95%CI:1.331~3.093). The stratified analysis of weight gain in 3rd trimester showed that there was no significant difference in the incidence of adverse pregnancy outcomes compared to weight gain rate groups in 2nd trimester.Conclusions: While this study showed gestational weight gain rate less than or greater than in 3rd trimester were associated with some adverse maternal and neonatal outcomes, further studies of prospective and multi-center researches are required to explore alternate ranges of gestational weight gain rate in twin pregnancies.