Objectives: For migrant female sex workers (FSWs) at the Sino-Vietnamese border, the impact of work time in their current location on the spread of HIV/AIDS is not clear.Methods: Data were collected from the Sino-Vietnamese border cities of Guangxi, China. Migrant FSWs working in these cities were studied. FSWs who worked less than 6 months in their current location were assigned to the shortterm work group (ST FSWs), and FSWs who worked equal to or longer than 6 months in their current location were assigned to the long-term work group (LT FSWs). Logistic regression was performed to examine the impact of work time in the current location and factors associated with HIV infection. Results:Among the 1667 migrant FSWs, 586 (35.2%) and 1081 (64.9%) were assigned to the ST FSW and LT FSW groups, respectively. Compared to LT FSWs, ST FSWs were more likely to be of Vietnamese nationality, be less than 18 years old when they first engaged in commercial sex work, and have a low-level of HIV-related knowledge and had higher odds of using condoms inconsistently, having more male clients, having no regular male clients, and having a history of male clients who used aphrodisiacs but lower odds of receiving free condoms distribution and education/ HIV counselling and testing programme. The analysis of factors associated with HIV infection revealed that Vietnamese FSWs, less than 18 years old when they first engaged in commercial sex work, having no regular male clients, and having lower average charge per sex transaction were correlated with HIV infection. Conclusion:FSWs with short-term work at the Sino-Vietnamese border had a higher risk of risky sex and were correlated with HIV risk factors. Vietnamese FSWs were at higher risk of HIV infection, and they were more likely to have short-term work. More targeted HIV prevention should be designed for new FSWs who recently began working in a locality to further control the spread of HIV, particularly cross-border FSWs. © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article' s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article'

The aim of this study was to evaluate the antimicrobial activity of Litsea cubeba (Lour.) Pers (L. cubeba) essential oil and its endophytic actinobacterial crude extracts (EACE) against pathogenic bacteria in individual and in combination. Using the broth micro-dilution assay, the results indicated that both L. cubeba essential oil and its EACE showed inhibition effect against respectively. From the indices of fractional inhibitory concentration (FIC) of the combination of L. cubeba essential oil and its EACE, the synergistic effects were found against E. coli, S. aureus, B. cereus and MRSE. The combination treatment of L. cubeba essential oil and its EACE enhance the inhibition effect against food-borne bacteria 16 times comparing with individual treatment.

Môi trường, Viện Hàn lâm KH & CN Việt Nam 3 Văn phòng Bộ, Bộ Khoa học và Công nghệ TÓM TẮT: Một trong những nghiên cứu công nghệ gần đây gây được sự chú ý bởi tính bền vững, kinh tế và an toàn là tái sử dụng bùn sinh học của các hệ thống xử lý nước thông qua sử dụng chất trợ keo tụ sinh học (EPS) từ vi khuẩn. Từ bùn thải của hệ thống xử lý nước thải ở nhà máy bia Hà Nội đóng tại Mê Linh, Vĩnh Phúc, 10 chủng vi khuẩn đã được được phân lập trên môi trường TSB. Chủng BES19 là một trong 10 chủng vi khuẩn trên đã được phân loại dựa trên trình tự đầy đủ của gene mã hóa 16S rRNA. Vi khuẩn này thuộc chi Bacillus và được đặt tên là Bacillus sp. BES19. Các chủng vi khuẩn nghiên cứu đều thể hiện khả năng tạo bông rõ rệt, hoạt tính keo tụ với cao lanh có bổ sung Ca 2+ nồng độ 150mg/l đạt được từ 36 đến 80% khi bổ sung lượng EPS khác nhau. EPS sinh tổng hợp bởi chủng BES19 có hoạt tính keo tụ tốt nhất đạt 80% với hàm lượng LB-EPS và TB-EPS sinh ra lần lượt là 4330 mg/l và 689 mg/l. Kết quả này mở ra hướng nghiên cứu mới về sản xuất các chất trợ keo tụ sinh học thân thiện môi trường thay thế dần cho các chất keo tụ hóa học đang được sử dụng hiện nay. Từ khóa: Bacillus, bùn thải, chất trợ keo tụ sinh học, EPS, vi khuẩn.