Purpose Continuing medical education (CME) is a compulsory requirement for every health professio... more Purpose Continuing medical education (CME) is a compulsory requirement for every health professional. However, to date, little is known about the effectiveness of CME in Vietnam. This study assessed CME programs based on attendees’ perception and evaluation. Methods A cross-sectional study was conducted during a five-month period in all 62 CME courses at a university hospital. A self-report, anonymous questionnaire was distributed to the participants during the course and was collected at the end of the course. The questionnaire included questions about demographic characteristics, experiences during the course and participants’ perception and evaluation as measured by the 19-item Program Evaluation Instrument (PEI). A higher score on the PEI indicates a higher level of positive reaction toward CME programs. Results Among 1312 participants in the analysis, the majority were females (58.1%) with a mean age of 34.5 (SD = 10.6) years. Almost all participants had good, positive percepti...
Purpose: Research conducted across different countries has consistently identified nonsuicidal se... more Purpose: Research conducted across different countries has consistently identified nonsuicidal self-injury (NSSI) to be a common and significant public health problem. This study examined the prevalence, associated factors and functions of NSSI, among a large sample of Vietnamese adolescents. Methods: A total of 1316 high school students (15-18 years old, 63.3% female) across urban and suburban areas in Ho Chi Minh City, participated in this cross-sectional study. NSSI was assessed by the Functional Assessment of Self-Mutilation. Results: Almost half (43.9%) of the adolescents engaged in at least one type of NSSI within the preceding 12-month period and more than one quarter (26.1%) engaged in multiple types of NSSI. Hitting self on purpose (23.1%), picking at a wound (17.0%), or biting self (16.7%) were the most frequent behaviours. Severe forms of NSSI such as scraping, burning or erasing skin were reported by 17.2%. The most common functions for NSSI were to stop bad feelings (56.0%), to punish self (48.7%), to get control of a situation (44.0%) and to feel relaxed (42.2%). Symptoms of depression, anxiety and stress were significant factors associated with NSSI, particularly for participants who engaged in moderate/severe NSSI and multiple types of NSSI. Conclusion: High rates of NSSI were found in Vietnamese adolescents. There is a pressing need for the development and implementation of effective interventions to reduce NSSI. Strategies that promote positive mental health and reduce symptoms of depression, anxiety and stress as well as approaches that help adolescents manage their internal emotions are likely to be beneficial.
Purpose: Little is known about the effect of COVID-19 pandemic on public health and preventive me... more Purpose: Little is known about the effect of COVID-19 pandemic on public health and preventive medicine students, particularly in resource-limited countries. This study evaluated stress level in this population in Vietnam and their coping strategies during the COVID-19 pandemic. Patients and Methods: A cross-sectional study was conducted in April 2020 among 563 public health and preventive medicine students. A structured questionnaire included background information, the level of stress measured by the Perceived Stress Scale (PSS) and coping strategies evaluated by the Brief COPE. To compare the PSS score and Brief COPE score among participants with different characteristics, two-sided t tests or ANOVA tests were used when appropriate. Results: Most participants were females (71.4%), and the mean age was 21.6 years old (SD = 2.1). Almost all had moderate to high levels of knowledge, attitude and skill toward COVID-19 prevention and protection. The mean PSS score was 17.02 (SD 4.06), and more than 80% had a certain level of stress. The mean score of approach coping strategies was higher than avoidant coping strategies (2.74 and 1.84). Students with a high level of stress had a higher preference for avoidance coping strategies. Conclusion: Although students reported relatively good knowledge, attitude and skill as well as the preference for adaptive coping strategies, they experienced a high level of stress during the COVID-19 pandemic.
Exposing to adverse childhood experiences (ACEs) has been identified as one of the major contribu... more Exposing to adverse childhood experiences (ACEs) has been identified as one of the major contributing factors to poor mental health and suicide in adolescents. However, little is known about this relationship in Vietnamese adolescents. This study aimed to evaluate the effect of ACEs on depression, psychological distress and suicidal thought among Vietnamese adolescents across different areas in Vietnam. Cross-sectional surveys were conducted among 4957 secondary school and high school students aged 13-20 in urban area, rural area, border area and mountainous area. The students were asked to complete a self-report questionnaire which included the Center for Epidemiological studies - Depression, the Kessler-10 and ACE questionnaire from the WHO Adverse Childhood Experiences Study. Suicidal thought was evaluated by a single question from the U.S. Youth Risk Behavior Survey. Among 4720 students included in the analysis, 54.4% were female. The prevalence of depression, psychological distress and suicidal thought was 22.9%, 30.6% and 10.9% respectively. About 86% of participants experienced at least one type of ACEs and nearly 56% reported multiple types of ACEs. Students with four or more types of ACEs had 6.98 (95% CI 5.09 -9.56), 4.72 (95 % CI 3.58-6.23) and 6.43 (95 % CI 4.45-9.30) times higher in odds of having depression, psychological distress and suicidal thought respectively. In conclusion, ACEs are common in Vietnamese adolescents and are strongly associated with depression, psychological distress and suicidal thought. Our finding indicates urgent needs for interventions targeting both ACEs and depression, psychological distress in Vietnamese adolescents.
Zinc ions (Zn 2+) are vital to most cells, with the intracellular concentrations of Zn 2+ being t... more Zinc ions (Zn 2+) are vital to most cells, with the intracellular concentrations of Zn 2+ being tightly regulated by multiple zinc transporters located at the plasma and organelle membranes. We herein present the 2.8-2.9 Å-resolution cryo-EM structures of a Golgilocalized human Zn 2+ /H + antiporter ZnT7 (hZnT7) in its outward-and inward-facing forms. Cryo-EM analyses showed that hZnT7 exists as a homodimer via tight interactions in both the cytosolic and transmembrane (TM) regions of two protomers, each of which contains a single Zn 2+-binding site in its TM domain. hZnT7 undergoes a TM-helix rearrangement to create a negatively charged cytosolic cavity for Zn 2+ entry in the inward-facing form and a widened luminal cavity for Zn 2+ release in the outward-facing form. An exceptionally long cytosolic histidine-rich loop characteristic of hZnT7 can bind at least two Zn 2+ ions, likely facilitating Zn 2+ recruitment from the cytosol. Unique mechanisms of hZnT7-mediated Zn 2+ uptake into the Golgi are proposed.
Purpose Continuing medical education (CME) is a compulsory requirement for every health professio... more Purpose Continuing medical education (CME) is a compulsory requirement for every health professional. However, to date, little is known about the effectiveness of CME in Vietnam. This study assessed CME programs based on attendees’ perception and evaluation. Methods A cross-sectional study was conducted during a five-month period in all 62 CME courses at a university hospital. A self-report, anonymous questionnaire was distributed to the participants during the course and was collected at the end of the course. The questionnaire included questions about demographic characteristics, experiences during the course and participants’ perception and evaluation as measured by the 19-item Program Evaluation Instrument (PEI). A higher score on the PEI indicates a higher level of positive reaction toward CME programs. Results Among 1312 participants in the analysis, the majority were females (58.1%) with a mean age of 34.5 (SD = 10.6) years. Almost all participants had good, positive percepti...
Purpose: Research conducted across different countries has consistently identified nonsuicidal se... more Purpose: Research conducted across different countries has consistently identified nonsuicidal self-injury (NSSI) to be a common and significant public health problem. This study examined the prevalence, associated factors and functions of NSSI, among a large sample of Vietnamese adolescents. Methods: A total of 1316 high school students (15-18 years old, 63.3% female) across urban and suburban areas in Ho Chi Minh City, participated in this cross-sectional study. NSSI was assessed by the Functional Assessment of Self-Mutilation. Results: Almost half (43.9%) of the adolescents engaged in at least one type of NSSI within the preceding 12-month period and more than one quarter (26.1%) engaged in multiple types of NSSI. Hitting self on purpose (23.1%), picking at a wound (17.0%), or biting self (16.7%) were the most frequent behaviours. Severe forms of NSSI such as scraping, burning or erasing skin were reported by 17.2%. The most common functions for NSSI were to stop bad feelings (56.0%), to punish self (48.7%), to get control of a situation (44.0%) and to feel relaxed (42.2%). Symptoms of depression, anxiety and stress were significant factors associated with NSSI, particularly for participants who engaged in moderate/severe NSSI and multiple types of NSSI. Conclusion: High rates of NSSI were found in Vietnamese adolescents. There is a pressing need for the development and implementation of effective interventions to reduce NSSI. Strategies that promote positive mental health and reduce symptoms of depression, anxiety and stress as well as approaches that help adolescents manage their internal emotions are likely to be beneficial.
A high prevalence of mental disorders in adolescents has been reported worldwide, but little is k... more A high prevalence of mental disorders in adolescents has been reported worldwide, but little is known about mental health literacy in this population, particularly in developing countries. The goal of this study was to evaluate mental health literacy level and help-seeking preferences in high school students in Ho Chi Minh City, Vietnam. These two variables were also compared between students who had stress, anxiety and depression with students who did not. A cross-sectional study was conducted with 1094 students across 27 classes at three high schools. Students completed a self-report questionnaire that included validated scales such as the Depression Anxiety Stress Scale (DASS-21), the Mental Health Literacy Scale (MHLS) and the General Help-Seeking Questionnaire. Based on the DASS-21, the prevalence of students reporting symptoms of stress, depression and anxiety was 36.1%, 39.8% and 59.8%, respectively. The mean MHLS score was 104.12 (SD = 10.09) and was significantly lower in students who had symptoms of depression. The most common help-seeking preferences for mental illness were friends, classmates and relatives or family members. Help-seeking preferences were almost identical among students with stress, anxiety or depression. While Vietnamese high school students had high levels of symptoms of stress, depression and anxiety and moderate levels of mental health literacy, non-professionals were preferred as their first help-seeking choice. Our findings revealed the need for routine school-based mental health screening and referral activities as well as mental health education programs for high school students in Vietnam.
Little is known about the effect of COVID-19 pandemic on public health and preventive medicine st... more Little is known about the effect of COVID-19 pandemic on public health and preventive medicine students, particularly in resource-limited countries. This study evaluated stress level in this population in Vietnam and their coping strategies during the COVID-19 pandemic. Patients and Methods: A cross-sectional study was conducted in April 2020 among 563 public health and preventive medicine students. A structured questionnaire included background information, the level of stress measured by the Perceived Stress Scale (PSS) and coping strategies evaluated by the Brief COPE. To compare the PSS score and Brief COPE score among participants with different characteristics, two-sided t tests or ANOVA tests were used when appropriate. Results: Most participants were females (71.4%), and the mean age was 21.6 years old (SD = 2.1). Almost all had moderate to high levels of knowledge, attitude and skill toward COVID-19 prevention and protection. The mean PSS score was 17.02 (SD 4.06), and more than 80% had a certain level of stress. The mean score of approach coping strategies was higher than avoidant coping strategies (2.74 and 1.84). Students with a high level of stress had a higher preference for avoidance coping strategies. Conclusion: Although students reported relatively good knowledge, attitude and skill as well as the preference for adaptive coping strategies, they experienced a high level of stress during the COVID-19 pandemic.
Exposing to adverse childhood experiences (ACEs) has been identified as one of the major contribu... more Exposing to adverse childhood experiences (ACEs) has been identified as one of the major contributing factors to poor mental health and suicide in adolescents. However, little is known about this relationship in Vietnamese adolescents. This study aimed to evaluate the effect of ACEs on depression, psychological distress and suicidal thought among Vietnamese adolescents across different areas in Vietnam. Cross-sectional surveys were conducted among 4957 secondary school and high school students aged 13-20 in urban area, rural area, border area and mountainous area. The students were asked to complete a self-report questionnaire which included the Center for Epidemiological studies - Depression, the Kessler-10 and ACE questionnaire from the WHO Adverse Childhood Experiences Study. Suicidal thought was evaluated by a single question from the U.S. Youth Risk Behavior Survey. Among 4720 students included in the analysis, 54.4% were female. The prevalence of depression, psychological distress and suicidal thought was 22.9%, 30.6% and 10.9% respectively. About 86% of participants experienced at least one type of ACEs and nearly 56% reported multiple types of ACEs. Students with four or more types of ACEs had 6.98 (95% CI 5.09 -9.56), 4.72 (95 % CI 3.58-6.23) and 6.43 (95 % CI 4.45-9.30) times higher in odds of having depression, psychological distress and suicidal thought respectively. In conclusion, ACEs are common in Vietnamese adolescents and are strongly associated with depression, psychological distress and suicidal thought. Our finding indicates urgent needs for interventions targeting both ACEs and depression, psychological distress in Vietnamese adolescents.
A high prevalence of mental disorders in adolescents has been reported worldwide, but little is k... more A high prevalence of mental disorders in adolescents has been reported worldwide, but little is known about mental health literacy in this population, particularly in developing countries. The goal of this study was to evaluate mental health literacy level and help-seeking preferences in high school students in Ho Chi Minh City, Vietnam. These two variables were also compared between students who had stress, anxiety and depression with students who did not. A cross-sectional study was conducted with 1094 students across 27 classes at three high schools. Students completed a self-report questionnaire that included validated scales such as the Depression Anxiety Stress Scale (DASS-21), the Mental Health Literacy Scale (MHLS) and the General Help-Seeking Questionnaire. Based on the DASS-21, the prevalence of students reporting symptoms of stress, depression and anxiety was 36.1%, 39.8% and 59.8%, respectively. The mean MHLS score was 104.12 (SD = 10.09) and was significantly lower in students who had symptoms of depression. The most common help-seeking preferences for mental illness were friends, classmates and relatives or family members. Help-seeking preferences were almost identical among students with stress, anxiety or depression. While Vietnamese high school students had high levels of symptoms of stress, depression and anxiety and moderate levels of mental health literacy, non-professionals were preferred as their first help-seeking choice. Our findings revealed the need for routine school-based mental health screening and referral activities as well as mental health education programs for high school students in Vietnam.
This study investigated whether screening for symptoms of mental disorders and referral to mental... more This study investigated whether screening for symptoms of mental disorders and referral to mental health services was associated with decreased depression symptoms among people living with HIV/ AIDS (PLHIV) in Vietnam. Four hundred PLHIV (63.5% male, mean age 34.8 (SD = 6.8) years) at two outpatient clinics in Ho Chi Minh City were interviewed by psychiatrists and also completed the Center for Epidemiologic Studies-Depression scale (CES-D). One hundred and seventy-four (43.5%) were identified with symptoms of a range of mental illnesses, including depression, anxiety, alcohol use disorder, substance use disorder and HIV associated dementia and were referred to mental health services. Of the 174 PLHIV referred, 162 (93%) returned and completed the CES-D three months later and 125 of these 162 (77%) had attended a mental health service and undertaken treatment. A significant improvement was found in the mean CES-D scores of the 125 attenders from baseline (M = 19.0, SD = 7.5) to month three (M = 11.7, SD = 7.9, p < 0.001). PLHIV who had attended a mental health service and undertaken treatment demonstrated a greater reduction of mean scores on the CES-D compared to PLHIV who had either received a referral but not attended a mental health service to undertake treatment, or not been referred initially.
Advances in Natural Sciences: Nanoscience and Nanotechnology, 2014
Over 60% of the original oil in a place (OOIP) is retained in a reservoir after conventional meth... more Over 60% of the original oil in a place (OOIP) is retained in a reservoir after conventional methods have been exploited. Application of enhanced oil recovery (EOR) technology gives an additional chance to get out possibly about 20% more oil from the reservoir. The use of water-soluble polymers improves the water–oil mobility ratio, therefore, the displacement efficiency increased, and leads to enhanced oil recovery. High-molecular-weight polyacrylamide group is widely and successfully used in EOR. But no commercial polymer composition can be used in conditions of high temperature and hardness brine offshore reservoirs yet. To avoid the time consumption and high expense for selection and synthesis of the appropriate-structural polymer for EOR application, we attempt to find additives to enhance the thermal stability of polymer solutions. In this paper, we report the results of improved viscosity stability of diluted polymer/seawater solutions aged at reservoir conditions for 31days by adding graphite-oxide particles (GOs). In the presence of 300 ppm of GOs, the viscosity stability of 1700 ppm acrylamide-based polymer in sea water solution increases from 92 °C to 135 °C. FESEM pictures show good distribution of GOs in polymer network, which is a result of integration of functional groups in GOs surfaces and hydrophilic polymer chains.
Phenol is an environmental pollutant present in industrial wastewaters such as refineries, coal p... more Phenol is an environmental pollutant present in industrial wastewaters such as refineries, coal processing and petrochemicals products. In this study three phenol degrading bacteria from Arak Petrochemical Complex effluent were isolated which consume phenol. Molecular analysis was used to identify bacteria and isolated bacteria were identified as Rhodococcus pyridinivorans (NS1), Advenella faeciporci (NS2) and Pseudomonas aeroginosa (NS3). Among the isolated strains, NS1 had the highest ability to degrade phenol. In order to observe the best yield in phenol biodegradation using NS1, optimization was performed using one factor at a time of experimental design to investigate the effect of four factors, including pH, temperature, phosphate and urea concentration. The optimal biodegradation condition through or tho pathway was pH = 8, urea = 1 g/L, temperature = 30°C and K 2 HPO 4 = 0.5 g/L. Under the suggested condition, a biodegradation efficiency of 100% was achieved. Moreover, NS1 has shown growth and phenol degradation in concentrations between 250 to 2000 mg/L. In a nutshell, the results revealed that phenol efficiently consumed by NS1 as the sole carbon source. Obviously, the isolate strain may be seen as an important tool in the bioremediation of wastewater effluent, petrochemical complex.
Purpose Continuing medical education (CME) is a compulsory requirement for every health professio... more Purpose Continuing medical education (CME) is a compulsory requirement for every health professional. However, to date, little is known about the effectiveness of CME in Vietnam. This study assessed CME programs based on attendees’ perception and evaluation. Methods A cross-sectional study was conducted during a five-month period in all 62 CME courses at a university hospital. A self-report, anonymous questionnaire was distributed to the participants during the course and was collected at the end of the course. The questionnaire included questions about demographic characteristics, experiences during the course and participants’ perception and evaluation as measured by the 19-item Program Evaluation Instrument (PEI). A higher score on the PEI indicates a higher level of positive reaction toward CME programs. Results Among 1312 participants in the analysis, the majority were females (58.1%) with a mean age of 34.5 (SD = 10.6) years. Almost all participants had good, positive percepti...
Purpose: Research conducted across different countries has consistently identified nonsuicidal se... more Purpose: Research conducted across different countries has consistently identified nonsuicidal self-injury (NSSI) to be a common and significant public health problem. This study examined the prevalence, associated factors and functions of NSSI, among a large sample of Vietnamese adolescents. Methods: A total of 1316 high school students (15-18 years old, 63.3% female) across urban and suburban areas in Ho Chi Minh City, participated in this cross-sectional study. NSSI was assessed by the Functional Assessment of Self-Mutilation. Results: Almost half (43.9%) of the adolescents engaged in at least one type of NSSI within the preceding 12-month period and more than one quarter (26.1%) engaged in multiple types of NSSI. Hitting self on purpose (23.1%), picking at a wound (17.0%), or biting self (16.7%) were the most frequent behaviours. Severe forms of NSSI such as scraping, burning or erasing skin were reported by 17.2%. The most common functions for NSSI were to stop bad feelings (56.0%), to punish self (48.7%), to get control of a situation (44.0%) and to feel relaxed (42.2%). Symptoms of depression, anxiety and stress were significant factors associated with NSSI, particularly for participants who engaged in moderate/severe NSSI and multiple types of NSSI. Conclusion: High rates of NSSI were found in Vietnamese adolescents. There is a pressing need for the development and implementation of effective interventions to reduce NSSI. Strategies that promote positive mental health and reduce symptoms of depression, anxiety and stress as well as approaches that help adolescents manage their internal emotions are likely to be beneficial.
Purpose: Little is known about the effect of COVID-19 pandemic on public health and preventive me... more Purpose: Little is known about the effect of COVID-19 pandemic on public health and preventive medicine students, particularly in resource-limited countries. This study evaluated stress level in this population in Vietnam and their coping strategies during the COVID-19 pandemic. Patients and Methods: A cross-sectional study was conducted in April 2020 among 563 public health and preventive medicine students. A structured questionnaire included background information, the level of stress measured by the Perceived Stress Scale (PSS) and coping strategies evaluated by the Brief COPE. To compare the PSS score and Brief COPE score among participants with different characteristics, two-sided t tests or ANOVA tests were used when appropriate. Results: Most participants were females (71.4%), and the mean age was 21.6 years old (SD = 2.1). Almost all had moderate to high levels of knowledge, attitude and skill toward COVID-19 prevention and protection. The mean PSS score was 17.02 (SD 4.06), and more than 80% had a certain level of stress. The mean score of approach coping strategies was higher than avoidant coping strategies (2.74 and 1.84). Students with a high level of stress had a higher preference for avoidance coping strategies. Conclusion: Although students reported relatively good knowledge, attitude and skill as well as the preference for adaptive coping strategies, they experienced a high level of stress during the COVID-19 pandemic.
Exposing to adverse childhood experiences (ACEs) has been identified as one of the major contribu... more Exposing to adverse childhood experiences (ACEs) has been identified as one of the major contributing factors to poor mental health and suicide in adolescents. However, little is known about this relationship in Vietnamese adolescents. This study aimed to evaluate the effect of ACEs on depression, psychological distress and suicidal thought among Vietnamese adolescents across different areas in Vietnam. Cross-sectional surveys were conducted among 4957 secondary school and high school students aged 13-20 in urban area, rural area, border area and mountainous area. The students were asked to complete a self-report questionnaire which included the Center for Epidemiological studies - Depression, the Kessler-10 and ACE questionnaire from the WHO Adverse Childhood Experiences Study. Suicidal thought was evaluated by a single question from the U.S. Youth Risk Behavior Survey. Among 4720 students included in the analysis, 54.4% were female. The prevalence of depression, psychological distress and suicidal thought was 22.9%, 30.6% and 10.9% respectively. About 86% of participants experienced at least one type of ACEs and nearly 56% reported multiple types of ACEs. Students with four or more types of ACEs had 6.98 (95% CI 5.09 -9.56), 4.72 (95 % CI 3.58-6.23) and 6.43 (95 % CI 4.45-9.30) times higher in odds of having depression, psychological distress and suicidal thought respectively. In conclusion, ACEs are common in Vietnamese adolescents and are strongly associated with depression, psychological distress and suicidal thought. Our finding indicates urgent needs for interventions targeting both ACEs and depression, psychological distress in Vietnamese adolescents.
Zinc ions (Zn 2+) are vital to most cells, with the intracellular concentrations of Zn 2+ being t... more Zinc ions (Zn 2+) are vital to most cells, with the intracellular concentrations of Zn 2+ being tightly regulated by multiple zinc transporters located at the plasma and organelle membranes. We herein present the 2.8-2.9 Å-resolution cryo-EM structures of a Golgilocalized human Zn 2+ /H + antiporter ZnT7 (hZnT7) in its outward-and inward-facing forms. Cryo-EM analyses showed that hZnT7 exists as a homodimer via tight interactions in both the cytosolic and transmembrane (TM) regions of two protomers, each of which contains a single Zn 2+-binding site in its TM domain. hZnT7 undergoes a TM-helix rearrangement to create a negatively charged cytosolic cavity for Zn 2+ entry in the inward-facing form and a widened luminal cavity for Zn 2+ release in the outward-facing form. An exceptionally long cytosolic histidine-rich loop characteristic of hZnT7 can bind at least two Zn 2+ ions, likely facilitating Zn 2+ recruitment from the cytosol. Unique mechanisms of hZnT7-mediated Zn 2+ uptake into the Golgi are proposed.
Purpose Continuing medical education (CME) is a compulsory requirement for every health professio... more Purpose Continuing medical education (CME) is a compulsory requirement for every health professional. However, to date, little is known about the effectiveness of CME in Vietnam. This study assessed CME programs based on attendees’ perception and evaluation. Methods A cross-sectional study was conducted during a five-month period in all 62 CME courses at a university hospital. A self-report, anonymous questionnaire was distributed to the participants during the course and was collected at the end of the course. The questionnaire included questions about demographic characteristics, experiences during the course and participants’ perception and evaluation as measured by the 19-item Program Evaluation Instrument (PEI). A higher score on the PEI indicates a higher level of positive reaction toward CME programs. Results Among 1312 participants in the analysis, the majority were females (58.1%) with a mean age of 34.5 (SD = 10.6) years. Almost all participants had good, positive percepti...
Purpose: Research conducted across different countries has consistently identified nonsuicidal se... more Purpose: Research conducted across different countries has consistently identified nonsuicidal self-injury (NSSI) to be a common and significant public health problem. This study examined the prevalence, associated factors and functions of NSSI, among a large sample of Vietnamese adolescents. Methods: A total of 1316 high school students (15-18 years old, 63.3% female) across urban and suburban areas in Ho Chi Minh City, participated in this cross-sectional study. NSSI was assessed by the Functional Assessment of Self-Mutilation. Results: Almost half (43.9%) of the adolescents engaged in at least one type of NSSI within the preceding 12-month period and more than one quarter (26.1%) engaged in multiple types of NSSI. Hitting self on purpose (23.1%), picking at a wound (17.0%), or biting self (16.7%) were the most frequent behaviours. Severe forms of NSSI such as scraping, burning or erasing skin were reported by 17.2%. The most common functions for NSSI were to stop bad feelings (56.0%), to punish self (48.7%), to get control of a situation (44.0%) and to feel relaxed (42.2%). Symptoms of depression, anxiety and stress were significant factors associated with NSSI, particularly for participants who engaged in moderate/severe NSSI and multiple types of NSSI. Conclusion: High rates of NSSI were found in Vietnamese adolescents. There is a pressing need for the development and implementation of effective interventions to reduce NSSI. Strategies that promote positive mental health and reduce symptoms of depression, anxiety and stress as well as approaches that help adolescents manage their internal emotions are likely to be beneficial.
A high prevalence of mental disorders in adolescents has been reported worldwide, but little is k... more A high prevalence of mental disorders in adolescents has been reported worldwide, but little is known about mental health literacy in this population, particularly in developing countries. The goal of this study was to evaluate mental health literacy level and help-seeking preferences in high school students in Ho Chi Minh City, Vietnam. These two variables were also compared between students who had stress, anxiety and depression with students who did not. A cross-sectional study was conducted with 1094 students across 27 classes at three high schools. Students completed a self-report questionnaire that included validated scales such as the Depression Anxiety Stress Scale (DASS-21), the Mental Health Literacy Scale (MHLS) and the General Help-Seeking Questionnaire. Based on the DASS-21, the prevalence of students reporting symptoms of stress, depression and anxiety was 36.1%, 39.8% and 59.8%, respectively. The mean MHLS score was 104.12 (SD = 10.09) and was significantly lower in students who had symptoms of depression. The most common help-seeking preferences for mental illness were friends, classmates and relatives or family members. Help-seeking preferences were almost identical among students with stress, anxiety or depression. While Vietnamese high school students had high levels of symptoms of stress, depression and anxiety and moderate levels of mental health literacy, non-professionals were preferred as their first help-seeking choice. Our findings revealed the need for routine school-based mental health screening and referral activities as well as mental health education programs for high school students in Vietnam.
Little is known about the effect of COVID-19 pandemic on public health and preventive medicine st... more Little is known about the effect of COVID-19 pandemic on public health and preventive medicine students, particularly in resource-limited countries. This study evaluated stress level in this population in Vietnam and their coping strategies during the COVID-19 pandemic. Patients and Methods: A cross-sectional study was conducted in April 2020 among 563 public health and preventive medicine students. A structured questionnaire included background information, the level of stress measured by the Perceived Stress Scale (PSS) and coping strategies evaluated by the Brief COPE. To compare the PSS score and Brief COPE score among participants with different characteristics, two-sided t tests or ANOVA tests were used when appropriate. Results: Most participants were females (71.4%), and the mean age was 21.6 years old (SD = 2.1). Almost all had moderate to high levels of knowledge, attitude and skill toward COVID-19 prevention and protection. The mean PSS score was 17.02 (SD 4.06), and more than 80% had a certain level of stress. The mean score of approach coping strategies was higher than avoidant coping strategies (2.74 and 1.84). Students with a high level of stress had a higher preference for avoidance coping strategies. Conclusion: Although students reported relatively good knowledge, attitude and skill as well as the preference for adaptive coping strategies, they experienced a high level of stress during the COVID-19 pandemic.
Exposing to adverse childhood experiences (ACEs) has been identified as one of the major contribu... more Exposing to adverse childhood experiences (ACEs) has been identified as one of the major contributing factors to poor mental health and suicide in adolescents. However, little is known about this relationship in Vietnamese adolescents. This study aimed to evaluate the effect of ACEs on depression, psychological distress and suicidal thought among Vietnamese adolescents across different areas in Vietnam. Cross-sectional surveys were conducted among 4957 secondary school and high school students aged 13-20 in urban area, rural area, border area and mountainous area. The students were asked to complete a self-report questionnaire which included the Center for Epidemiological studies - Depression, the Kessler-10 and ACE questionnaire from the WHO Adverse Childhood Experiences Study. Suicidal thought was evaluated by a single question from the U.S. Youth Risk Behavior Survey. Among 4720 students included in the analysis, 54.4% were female. The prevalence of depression, psychological distress and suicidal thought was 22.9%, 30.6% and 10.9% respectively. About 86% of participants experienced at least one type of ACEs and nearly 56% reported multiple types of ACEs. Students with four or more types of ACEs had 6.98 (95% CI 5.09 -9.56), 4.72 (95 % CI 3.58-6.23) and 6.43 (95 % CI 4.45-9.30) times higher in odds of having depression, psychological distress and suicidal thought respectively. In conclusion, ACEs are common in Vietnamese adolescents and are strongly associated with depression, psychological distress and suicidal thought. Our finding indicates urgent needs for interventions targeting both ACEs and depression, psychological distress in Vietnamese adolescents.
A high prevalence of mental disorders in adolescents has been reported worldwide, but little is k... more A high prevalence of mental disorders in adolescents has been reported worldwide, but little is known about mental health literacy in this population, particularly in developing countries. The goal of this study was to evaluate mental health literacy level and help-seeking preferences in high school students in Ho Chi Minh City, Vietnam. These two variables were also compared between students who had stress, anxiety and depression with students who did not. A cross-sectional study was conducted with 1094 students across 27 classes at three high schools. Students completed a self-report questionnaire that included validated scales such as the Depression Anxiety Stress Scale (DASS-21), the Mental Health Literacy Scale (MHLS) and the General Help-Seeking Questionnaire. Based on the DASS-21, the prevalence of students reporting symptoms of stress, depression and anxiety was 36.1%, 39.8% and 59.8%, respectively. The mean MHLS score was 104.12 (SD = 10.09) and was significantly lower in students who had symptoms of depression. The most common help-seeking preferences for mental illness were friends, classmates and relatives or family members. Help-seeking preferences were almost identical among students with stress, anxiety or depression. While Vietnamese high school students had high levels of symptoms of stress, depression and anxiety and moderate levels of mental health literacy, non-professionals were preferred as their first help-seeking choice. Our findings revealed the need for routine school-based mental health screening and referral activities as well as mental health education programs for high school students in Vietnam.
This study investigated whether screening for symptoms of mental disorders and referral to mental... more This study investigated whether screening for symptoms of mental disorders and referral to mental health services was associated with decreased depression symptoms among people living with HIV/ AIDS (PLHIV) in Vietnam. Four hundred PLHIV (63.5% male, mean age 34.8 (SD = 6.8) years) at two outpatient clinics in Ho Chi Minh City were interviewed by psychiatrists and also completed the Center for Epidemiologic Studies-Depression scale (CES-D). One hundred and seventy-four (43.5%) were identified with symptoms of a range of mental illnesses, including depression, anxiety, alcohol use disorder, substance use disorder and HIV associated dementia and were referred to mental health services. Of the 174 PLHIV referred, 162 (93%) returned and completed the CES-D three months later and 125 of these 162 (77%) had attended a mental health service and undertaken treatment. A significant improvement was found in the mean CES-D scores of the 125 attenders from baseline (M = 19.0, SD = 7.5) to month three (M = 11.7, SD = 7.9, p < 0.001). PLHIV who had attended a mental health service and undertaken treatment demonstrated a greater reduction of mean scores on the CES-D compared to PLHIV who had either received a referral but not attended a mental health service to undertake treatment, or not been referred initially.
Advances in Natural Sciences: Nanoscience and Nanotechnology, 2014
Over 60% of the original oil in a place (OOIP) is retained in a reservoir after conventional meth... more Over 60% of the original oil in a place (OOIP) is retained in a reservoir after conventional methods have been exploited. Application of enhanced oil recovery (EOR) technology gives an additional chance to get out possibly about 20% more oil from the reservoir. The use of water-soluble polymers improves the water–oil mobility ratio, therefore, the displacement efficiency increased, and leads to enhanced oil recovery. High-molecular-weight polyacrylamide group is widely and successfully used in EOR. But no commercial polymer composition can be used in conditions of high temperature and hardness brine offshore reservoirs yet. To avoid the time consumption and high expense for selection and synthesis of the appropriate-structural polymer for EOR application, we attempt to find additives to enhance the thermal stability of polymer solutions. In this paper, we report the results of improved viscosity stability of diluted polymer/seawater solutions aged at reservoir conditions for 31days by adding graphite-oxide particles (GOs). In the presence of 300 ppm of GOs, the viscosity stability of 1700 ppm acrylamide-based polymer in sea water solution increases from 92 °C to 135 °C. FESEM pictures show good distribution of GOs in polymer network, which is a result of integration of functional groups in GOs surfaces and hydrophilic polymer chains.
Phenol is an environmental pollutant present in industrial wastewaters such as refineries, coal p... more Phenol is an environmental pollutant present in industrial wastewaters such as refineries, coal processing and petrochemicals products. In this study three phenol degrading bacteria from Arak Petrochemical Complex effluent were isolated which consume phenol. Molecular analysis was used to identify bacteria and isolated bacteria were identified as Rhodococcus pyridinivorans (NS1), Advenella faeciporci (NS2) and Pseudomonas aeroginosa (NS3). Among the isolated strains, NS1 had the highest ability to degrade phenol. In order to observe the best yield in phenol biodegradation using NS1, optimization was performed using one factor at a time of experimental design to investigate the effect of four factors, including pH, temperature, phosphate and urea concentration. The optimal biodegradation condition through or tho pathway was pH = 8, urea = 1 g/L, temperature = 30°C and K 2 HPO 4 = 0.5 g/L. Under the suggested condition, a biodegradation efficiency of 100% was achieved. Moreover, NS1 has shown growth and phenol degradation in concentrations between 250 to 2000 mg/L. In a nutshell, the results revealed that phenol efficiently consumed by NS1 as the sole carbon source. Obviously, the isolate strain may be seen as an important tool in the bioremediation of wastewater effluent, petrochemical complex.
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