In this work, lemon and onion biomasses commonly found in street markets are for the first time used to develop a facile, fast and low-cost one-step microwave-assisted carbonization method for synthesis of highly fluo...In this work, lemon and onion biomasses commonly found in street markets are for the first time used to develop a facile, fast and low-cost one-step microwave-assisted carbonization method for synthesis of highly fluorescent carbon dots (CDs). The structure and optical properties of CDs were investigated by TEM, XRD, XRF, UV-Vis, FTIR, and fluorescence spectroscopy. CDs displayed satisfactory optical pro-prieties, a high quantum yield of 23.6%, and excellent water solubility, and the particle size was 4.23-8.22 nm with an average diameter of 6.15 nm. An efficient fluorescent resonance energy transfer (FRET) between the CDs and riboflavin was achieved with CDs acting as donor and riboflavin as acceptor. A linear relationship between FRET and the riboflavin concentration from 0.10 to 3.0 μg/mL was observed, allowing the development of an accurate and fast analytical method to determine this vitamin in multivitamin/mineral supplements. Despite the potential interferences in these supplements, CDs were selective for riboflavin under optimized conditions. A paired t-test at a 95% confidence level indicated no statistically significant difference between the proposed and the reference methods. Recovery test presented values ranged from 96.0% to 101.4%. The limit of detection and relative standard deviation were estimated at 1.0 ng/mL and <2.6% (n = 3), respectively. CDs were successfully synthesized in a domestic microwave oven (1450 W, 6 min), presenting satisfactory parameters when compared with results of other studies reported in the literature, suggesting that the proposed method is a potentially useful method for the synthesis of CDs and determination of riboflavin.展开更多
Micronutrient deficiencies, in HIV/AIDS infected children, are common and associated with disease progression and increased mortality. There is no evidence to support specific recommendation for in-patient treatment o...Micronutrient deficiencies, in HIV/AIDS infected children, are common and associated with disease progression and increased mortality. There is no evidence to support specific recommendation for in-patient treatment of severely malnourished HIV/AID infected children. We analyzed the impact of daily oral multivitamin and mineral supplementation on nutritional status and on mortality rate, of severely malnourished HIV/AIDS infected infants, hospitalized in a feeding therapeutic center. Children were randomized at admission in one of the two treatment groups: WHO standard group or additional dose group. The trial has been approved by the national health research ethics committee. Case fatality rate was high in each group. There was no difference in mortality rate between WHO standard group (mortality rate = 16.9%) and “additional dose” group (mortality rate = 17.6%). Kaplan Meir survival curves did not differ between the two groups, (p Log Rank = 0.87). During the inpatient follow-up, the median weight gain (g/kg/d) was low in groups and did not differ between WHO standard group (8.88g/kg/d Min = 4.70, Max = 17.23) and “additional dose” group (10.50g/kg/d, Min = 3.29 Max = 17.81) (Wilcoxon test p-value = 0.10). From admission to discharge, anthropometric Z-scores means evolution did not differ between the two groups: WHZ (p = 0.74), WAZ (p = 0.79) and MUAC (p = 0.73). In this randomized trial among severely malnourished HIV/AIDS infected children, we found no evidence that the provision of daily additional micro-nutrient dose during inpatient treatment, compared to WHO standard, improves nutritional status or reduces case fatality rate. Rigorous malnutrition inpatient treatments, including effective HIV/AIDS management, improve nutritional status of severely mal-nourished HIV infected children.展开更多
Medicines advertising can be discussed from several perspectives. The study can be directed to its informational content, current legislation, characteristic (persuasive, informative) and the use of euphemisms. In thi...Medicines advertising can be discussed from several perspectives. The study can be directed to its informational content, current legislation, characteristic (persuasive, informative) and the use of euphemisms. In this paper, the authors indicated the values present in the advertising content of the Centrum brand, classified by the World Health Organization (WHO) as Over the Counter—OTC Medicine, based on the content analysis [1] of whose evaluations will be based on advertising objects published on Facebook.展开更多
文摘In this work, lemon and onion biomasses commonly found in street markets are for the first time used to develop a facile, fast and low-cost one-step microwave-assisted carbonization method for synthesis of highly fluorescent carbon dots (CDs). The structure and optical properties of CDs were investigated by TEM, XRD, XRF, UV-Vis, FTIR, and fluorescence spectroscopy. CDs displayed satisfactory optical pro-prieties, a high quantum yield of 23.6%, and excellent water solubility, and the particle size was 4.23-8.22 nm with an average diameter of 6.15 nm. An efficient fluorescent resonance energy transfer (FRET) between the CDs and riboflavin was achieved with CDs acting as donor and riboflavin as acceptor. A linear relationship between FRET and the riboflavin concentration from 0.10 to 3.0 μg/mL was observed, allowing the development of an accurate and fast analytical method to determine this vitamin in multivitamin/mineral supplements. Despite the potential interferences in these supplements, CDs were selective for riboflavin under optimized conditions. A paired t-test at a 95% confidence level indicated no statistically significant difference between the proposed and the reference methods. Recovery test presented values ranged from 96.0% to 101.4%. The limit of detection and relative standard deviation were estimated at 1.0 ng/mL and <2.6% (n = 3), respectively. CDs were successfully synthesized in a domestic microwave oven (1450 W, 6 min), presenting satisfactory parameters when compared with results of other studies reported in the literature, suggesting that the proposed method is a potentially useful method for the synthesis of CDs and determination of riboflavin.
文摘Micronutrient deficiencies, in HIV/AIDS infected children, are common and associated with disease progression and increased mortality. There is no evidence to support specific recommendation for in-patient treatment of severely malnourished HIV/AID infected children. We analyzed the impact of daily oral multivitamin and mineral supplementation on nutritional status and on mortality rate, of severely malnourished HIV/AIDS infected infants, hospitalized in a feeding therapeutic center. Children were randomized at admission in one of the two treatment groups: WHO standard group or additional dose group. The trial has been approved by the national health research ethics committee. Case fatality rate was high in each group. There was no difference in mortality rate between WHO standard group (mortality rate = 16.9%) and “additional dose” group (mortality rate = 17.6%). Kaplan Meir survival curves did not differ between the two groups, (p Log Rank = 0.87). During the inpatient follow-up, the median weight gain (g/kg/d) was low in groups and did not differ between WHO standard group (8.88g/kg/d Min = 4.70, Max = 17.23) and “additional dose” group (10.50g/kg/d, Min = 3.29 Max = 17.81) (Wilcoxon test p-value = 0.10). From admission to discharge, anthropometric Z-scores means evolution did not differ between the two groups: WHZ (p = 0.74), WAZ (p = 0.79) and MUAC (p = 0.73). In this randomized trial among severely malnourished HIV/AIDS infected children, we found no evidence that the provision of daily additional micro-nutrient dose during inpatient treatment, compared to WHO standard, improves nutritional status or reduces case fatality rate. Rigorous malnutrition inpatient treatments, including effective HIV/AIDS management, improve nutritional status of severely mal-nourished HIV infected children.
文摘Medicines advertising can be discussed from several perspectives. The study can be directed to its informational content, current legislation, characteristic (persuasive, informative) and the use of euphemisms. In this paper, the authors indicated the values present in the advertising content of the Centrum brand, classified by the World Health Organization (WHO) as Over the Counter—OTC Medicine, based on the content analysis [1] of whose evaluations will be based on advertising objects published on Facebook.
