No abstract

Human urine is known as the excreta with a high concentration of nitrogen and phosphorus, causing eutrophication in water bodies. In this study, human urine was used to feed microalgae (Chlorella vulgaris) in a membrane photobioreactor (MPBR) at various microalgae retention times (MRTs) and hydraulic retention time (HRT) of 2 days to evaluate its biomass production. The results indicate that MPBR was operated under MRT of 2 to 5 days and HRT of 2 days, which performed the optimum condition with biomass productivity from 146.43±8.52 to 151.93±15.05 mg.l-1 .day. Moreover, the MPBR using the urine as a nutrient source demonstrated the high performance in biomass production and strong growth of microalgae.

The ability of endophytic fungi to produce valuable bioactive compounds when surviving in medicinal herbs. Finding out endophytic fungi originated from Catharanthus roseus with antimicrobial, antioxidant and cytotoxicity activities is important for pharmaceutical development. The isolation was based on the morphology of fungi. Identification was performed by sequencing 18S rRNA that was compared with known genes using Blast search in the combination of phylogenic analysis by using Clustal W and PhyML in GenomeNet. For the antimicrobial test, the agar diffusion method was used. DPPH scavenging assay for the antioxidant activity determination by using spectrophotometry. The cytotoxicity test was carried out by Sulforhodamine B method. LC-MS was applied for predicting components. We isolated the Fusarium oxysporum F01 strain originated from Catharanthus roseus. The aqueous extracts showed inhibition against Staphylococcus aureus ATCC 25923, Pseudomonas aeruginosa ATCC 27853 (15.00 ± 0.50 mm), Serratia marcescens ATCC 14756 (9.00 ± 0.87 mm), Vibrio parahaemolyticus ATCC 17802 (15.50 ± 0.87 mm), Escherichia coli ATCC 25922 (12.50 ± 0.50 mm). The antioxidant activity of the extract obtained from the supernatant was determined with an IC50 value of about 11 µg/mL. The extract also showed cytotoxicity effect on liver cancer cell line (HepG2) and breast cancer cell line (MCF-7) with the percentage of inhibition of 84.47 ± 3.18 and 94.69 ± 1.59, respectively. LC-MS was used to point out the presence of pratol, a melanogenesis agent. The study provided more interesting information about Fusarium oxysporum F01 isolated in Catharanthus roseus grown in Vietnam, contributing to pharmaceutical sources in the world.

Absorptive capacity of host countries towards foreign direct investment (FDI) has received a lot of attention from researchers around the world. However, research on this issue is still limited in Vietnam. Based on the theory of FDI absorptive capacity, this paper approaches the regression analysis method by using Autoregressive Distributed Lag model (ARDL) of Pesaran et al., 2001 to investigate and point out factors that play a role likeFDI absorptive factors with economic growth in Binh Dinh province, Vietnam. The research results shown that among the FDI absorptivefactors, the impact of FDI on economic growth in Binh Dinh province depends on human capital and local infrastructure. Thereby, this paper gives some recommendations for management agencies. Besides to focusing on FDI attraction, local authorities should pay attention to improve FDI absorptive capacity to promote the role of this capital source for economic growth.

Absorptive capacity of host countries towards foreign direct investment (FDI) has received a lot of attention from researchers around the world. However, research on this issue is still limited in Vietnam. Based on the theory of FDI absorptive capacity, this paper approaches the regression analysis method by using Autoregressive Distributed Lag model (ARDL) of Pesaran et al., 2001 to investigate and point out factors that play a role likeFDI absorptive factors with economic growth in Binh Dinh province, Vietnam. The research results shown that among the FDI absorptivefactors, the impact of FDI on economic growth in Binh Dinh province depends on human capital and local infrastructure. Thereby, this paper gives some recommendations for management agencies. Besides to focusing on FDI attraction, local authorities should pay attention to improve FDI absorptive capacity to promote the role of this capital source for economic growth.