By using microwave extraction, a GC/MS method was developed for the determination of polycyclic aromatic hydrocarbons ( PAHs) content in soil which is around the discharge ditch of oily wastewater, and a correlation analysis of the content of organic matter in soil was carried out. The results showed that PAHs in the surface soil pollution were mainly from 2 to 4 rings of low molecular PAHs, and the PAHs with high molecular were not detected. Each sampling point belongs to slight or moderate pollution and the overall assessment is moderate pollution, which is middle and low lever in comparison with soil data of central regions. The origin may be the low molecular PAHs of oil pollution along with the atmospheric transmission, but it cannot be completely excluded the possibility of fuel combustion pollution. No obvious correlation was found between the content of polycyclic aromatic hydrocarbons and organic matter.

Objective: The prevalence of HIV/AIDS in people aged ≥50 years is increasing in China, resulting in another focus for AIDS prevention and control. A Meta-analysis was conducted to evaluate the HIV infection, its area and time distributions in people aged ≥50 years in China to provide evidence for the prevention and control of HIV/AIDS. Methods: Information on HIV infection rate in people aged ≥50 years in China were collected from Wanfang digital database, China National Knowledge Infrastructure (CNKI), PubMed and Embase. The R Studio1.1.456 software was used to calculate the pooled infection rate, and assessed the publication bias. Results: A total of 30 studies which covered 13 provinces were selected. From 2010 to 2018, the pooled HIV infection rate in people aged ≥50 years was 1.68% (95%CI:1.00%-2.79%). The HIV infection rate (2.60%) was higher in eastern China than in central and western China (0.16%, 2.13%). Conclusion The overall HIV infection rate in people aged ≥50 years is generally high in China. It is important to control the HIV infection in this population to facilitate the AIDS prevention and control in China.

Objective:To explore the value of three-dimensional speckle tracking imaging (3D-STI) in the diagnosis of immunoglobulin light-chain cardiac amyloidosis(AL-CA) patients with normal left ventricular ejection fraction (LVEF).Methods:A total of 92 consecutive patients diagnosed with systemic immunoglobulin light chain amyloidosis(sAL) and with normal LVEF from October 2014 to January 2018 in Xijing Hospital were enrolled.Based on the diagnostic criteria of cardiac involvement, the patients were divided into AL-CA group (52 cases) and immunoglobulin light chain amyloidosis (AL) group (40 cases). The clinical data and serological markers of the patients were collected, the conventional echocardiography and full-volume three dimensional dynamic images were acquired, left ventricular global longitudinal strain (GLS), global radial strain (GRS), global circumferential strain (GCS), and global area strain (GAS) were analyzed using off-line TomTec software. The differences between the two groups were compared.Results:Compared with the AL group, the NT-proBNP of AL-CA group was significantly higher ( P<0.05) and there were no significant differences of the other serological indexes between the two groups(all P>0.05). Compared with the AL group, the maximal left ventricular wall thickness, left ventricular mass index, left atrial volume index, and E/e′ in the AL-CA group were significantly increased (all P<0.05). There were no significant differences of other conventional echocardiographic measurements between the two groups(all P>0.05). Compared with the AL group, GLS, GAS, and GRS were significantly lower in AL-CA group (all P<0.05); but there was no significant difference of GCS between the two groups( P>0.05). The ROC curve analysis showed that the cut-off values discriminating cardiac involvement were 16.09% for GLS, 36.54% for GAS and 31.90% for GRS. Conclusions:3D-STI measurements of left ventricular myocardial mechanics could detect cardiac involvement in patients with sAL amyloidosis, and provides a new method for diagnosis of AL-CA.

Objective: To understand the AIDS awareness and related factors as well as the demands for AIDS-related health education programs, among first-grade students from three senior high schools in Tianjin. Methods: A cross-sectional study using both stratified cluster and convenient sampling methods was conducted. Anonymous questionnaires including social demographic characteristics, AIDS-related knowledge and needs for AIDS health education were distributed to the first-grade students from two general middle schools and one vocational senior middle school in Tianjin. Results: A total of 1 082 students were responding to the questionnaires. Among them, the overall awareness rates of AIDS-related knowledge were 34.3%(371/1 082), 71.9%(778/1 082) of the students had received knowledge about AIDS and 59.4% (643/1 082) of the students had received knowledge about sexual health in the past, from the three schools. There appeared statistical differences among the two types of schools. 7.0% (76/1 082) of the students reported having had sexual behaviors. Results from the multivariate logistic regression analysis showed that, in vocational senior middle school, the awareness rate of AIDS knowledge was lower (compared with general middle school, OR=0.41, 95%CI: 0.29-0.59) and in the following items, including no need in receiving safe sex health knowledge (compared with needs of safe sex health knowledge, OR=0.62, 95%CI: 0.43-0.91), no interests in reading AIDS-related health education materials (compared with attention to AIDS health education materials, OR=0.41, 95%CI: 0.30-0.56), not aware of safe sex behavior (compared with aware of safe sex behavior, OR=0.55, 95%CI: 0.39-0.77), not aware of correct condom use, compared with aware of correct condom use (OR=0.33, 95%CI: 0.24-0.46). Conclusions The overall awareness rate of AIDS knowledge was low among the first-grade students in Tianjin. Some students reported of already having had insertive sex, sexual health knowledge has a significant impact on AIDS knowledge, suggesting that sexual health education and AIDS health education among high school students be strengthened in Tianjin.