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Research paper thumbnail of Effect of Nitrogen and Potassium on Growth, Yield, and Seed Quality of Quinoa in Ferralsols and Acrisols under Rainfed Conditions

Journal of Ecological Engineering, 2022

Research paper thumbnail of Livelihood Diversification and Rural-Urban Linkages in Vietnam's Red River Delta

With high population density and limited land availability, Vietnam's Red River Delta is unde... more With high population density and limited land availability, Vietnam's Red River Delta is undergoing a major transformation as its economic base moves away from subsistence farming towards intensive, high-value food production for export and local urban markets, and nonfarm employment. This paper describes the changing livelihoods of the residents of two villages that represent two different pathways to local economic development. One village relies primarily on agricultural intensification and diversification, although in combination with nonfarm activities. These nonfarm activities are either supplementary (such as handicraft production and seasonal migration) or related to farming, such as provision of agricultural services, transport and trade of agricultural produce. To a large extent, it is this nonfarm income that allows investment in agriculture at the household level. Residents of the second village, although nominally still owning rice farms, have effectively moved out ...

Research paper thumbnail of Reliability and validity of the Vietnamese version of the 9‐item Utrecht Work Engagement Scale

Journal of Occupational Health, 2020

ObjectivesThe present study investigated the reliability and validity of a newly developed Vietna... more ObjectivesThe present study investigated the reliability and validity of a newly developed Vietnamese version of the 9‐item Utrecht Work Engagement Scale (UWES‐9‐V) in a sample of hospital nurses in Hanoi, Vietnam.MethodsThe UWES‐9 was translated into Vietnamese following a standard procedure. A survey was conducted of 949 registered nurses in a large tertiary general hospital in Hanoi, Vietnam, in 2018, using a self‐administered questionnaire including the Vietnamese UWES‐9, other scales measuring health status, work performance, job demand, job control, and workplace social support, and questions pertaining to demographic variables. Cronbach’s alpha and interclass correlation coefficients (ICC) were calculated to assess reliability. Explanatory and confirmatory factor analyses were conducted to assess factorial validity. Convergent validity was tested based on associations between the UWES‐9‐V and subscales and other scales.ResultsThe Cronbach’s alpha coefficients of the UWES‐9‐V ...

Research paper thumbnail of Wolf DF pmed.1001082

Research paper thumbnail of The Relationship between a Mega Sport Event and the Host Destination

International Journal of Tourism Sciences, 2014

Abstract Tourism and sport are key elements of the culture in many countries and can influence th... more Abstract Tourism and sport are key elements of the culture in many countries and can influence the behavior of society. Especially since the 1960’s, mega sport events have become a huge international draw card garnering a large amount of media attention, and attracting investment and also political interest. Tourism remains the world’s largest industry and continues to develop and grow. The aim of this study is to assess the relationship between a mega sport event and the host destination. To address the aim, the research was conducted in two stages: the first stage was a literature review which presents a deeper understanding of the two-way relationship: (i) Mega sport events create opportunities for the host destination and (ii) The host destination attracts tourists to attend the mega sport event. The second stage explores two methods destinations can use to host a mega sport event successful.

Research paper thumbnail of Response to “Questionable merits of the field trial of an oral killed whole cell cholera vaccine in Vietnam during 1998–2003” Vaccine 2007;25(8):1353–4

Research paper thumbnail of Post-licensure deployment of oral cholera vaccines: a systematic review

Bulletin of the World Health Organization, 2014

To describe and analyse the characteristics of oral cholera vaccination campaigns; including loca... more To describe and analyse the characteristics of oral cholera vaccination campaigns; including location, target population, logistics, vaccine coverage and delivery costs. We searched PubMed, the World Health Organization (WHO) website and the Cochrane database with no date or language restrictions. We contacted public health personnel, experts in the field and in ministries of health and did targeted web searches. A total of 33 documents were included in the analysis. One country, Viet Nam, incorporates oral cholera vaccination into its public health programme and has administered approximately 10.9 million vaccine doses between 1997 and 2012. In addition, over 3 million doses of the two WHO pre-qualified oral cholera vaccines have been administered in more than 16 campaigns around the world between 1997 and 2014. These campaigns have either been pre-emptive or reactive and have taken place under diverse conditions, such as in refugee camps or natural disasters. Estimated two-dose co...

Research paper thumbnail of Population Based Cohort Study for Pediatric Infectious Diseases Research in Vietnam

Tropical Medicine and Health, 2014

Research paper thumbnail of Drug‐resistant pneumococci in children with acute lower respiratory infections in Vietnam

Pediatrics International, 2008

Background: Acute lower respiratory infections (ALRI), primarily pneumonia, are the leading cause... more Background: Acute lower respiratory infections (ALRI), primarily pneumonia, are the leading cause of death in children under 5 years of age. Most of these deaths occur in Africa and southeast Asia. Increasing rates of drug resistance in pneumococcal strains emphasize the necessity of prevention of pneumococcal vaccines. The aim of the present study was to determine the frequency of drug resistance and the distribution of serotype of pneumococcal strains isolated from pediatric patients with ALRI in Vietnam.Methods: Two hundred and twenty pediatric patients with ALRI under 5 years of age were enrolled in Hanoi, Vietnam between 2001 and 2002. Bacterial pathogens with a heavy growth (106 c.f.u./mL) were isolated from nasopharyngeal secretions on quantitative culture. Fifty‐three pneumococcal strains isolated from the nasopharynx of pediatric patients were examined for antibiotic susceptibility including drug‐resistant genes and serotyping.Results: A total of 73.6% of pneumococcal strai...

Research paper thumbnail of Private Demand for Cholera Vaccines in Hue, Vietnam

Research paper thumbnail of Long-term effectiveness against cholera of oral killed whole-cell vaccine produced in Vietnam

Research paper thumbnail of Seroprevalence of rubella in the cord blood of pregnant women and congenital rubella incidence in Nha Trang, Vietnam

Vaccine, 2014

To investigate susceptibility to and factors associated with rubella infection among pregnant mot... more To investigate susceptibility to and factors associated with rubella infection among pregnant mothers and to estimate the burden of congenital rubella infection (CRI) in Vietnam where rubella-containing vaccine (RCV) is not included in the routine immunization programme, we conducted a prospective cohort study in Nha Trang, Vietnam between 2009 and 2010. Rubella-specific immunoglobulin-M and immunoglobulin-G were investigated in cord blood samples by enzyme immunoassay. Corresponding clinical-epidemiological data were analyzed and the national congenital rubella syndrome (CRS) incidence was estimated using modeling. We enrolled 1988 pairs of mothers aged 17-45 years and their newborn babies. No mothers had received RCV. Multivariate analysis revealed that mothers aged 17-24 (aOR 2.5, 95% CI: 1.7-3.8) or 25-34 (1.4, 1.0-2.1) years were more likely to be susceptible than those aged 35-45 years. Overall 28.9% (574/1988, 95% CI: 26.9-30.9%) of mothers were seronegative. The CRI rate was 151 (95% CI: 0-322) per 100,000 live births. Modeling estimated that 3788 babies (95% CI: 3283-4143) were born with CRS annually in Vietnam with an overall CRS incidence of 234 (95% CI: 207-262) cases per 100,000 live births. A substantial proportion of women of childbearing age (WCBA) are at risk of rubella infection during pregnancy and this can result in a high frequency of miscarriage or burden of CRS across Vietnam. Prompt introduction of RCV into national immunization programme with catch-up vaccination to children and WCBA will reduce CRI in Vietnam.

Research paper thumbnail of Outpatient treatment of children with severe pneumonia with oral amoxicillin in four countries: the MASS study

Tropical Medicine & International Health, 2011

Research paper thumbnail of Increased Rates of Intense Nasopharyngeal Bacterial Colonization of Vietnamese Children with Radiological Pneumonia

The Tohoku Journal of Experimental Medicine, 2007

Research paper thumbnail of Who is exposed to smoke at home? A population-based cross-sectional survey in central Vietnam

Research paper thumbnail of Association of environmental tobacco smoking exposure with an increased risk of hospital admissions for pneumonia in children under 5 years of age in Vietnam

Research paper thumbnail of Use of Oral Cholera Vaccines in an Outbreak in Vietnam: A Case Control Study

PLoS Neglected Tropical Diseases, 2011

Research paper thumbnail of Advantages of fluoroformates as carboalkoxylating reagents for polar reactants

The Journal of Organic Chemistry, 1990

ABSTRACT

Research paper thumbnail of A simple conversion of 1-chloroethyl carbonates to fluoroformates: value in the preparation of tertiary alkyl fluoroformates

The Journal of Organic Chemistry, 1990

Acknowledgment. Acknowledgment is made to the donors of the Petroleum Research Fund, administered... more Acknowledgment. Acknowledgment is made to the donors of the Petroleum Research Fund, administered by the American Chemical Society, for support of this re-search. Dr. K. Zaw is grateful to Loyola University and the Searle Foundation for a Searle Postdoctoral Fellow-ship. ...

Research paper thumbnail of Epidemiological Profile and Burden of Rotavirus Diarrhea in Vietnam: 5 Years of Sentinel Hospital Surveillance, 1998–2003

The Journal of Infectious Diseases, 2005

Research paper thumbnail of Effect of Nitrogen and Potassium on Growth, Yield, and Seed Quality of Quinoa in Ferralsols and Acrisols under Rainfed Conditions

Journal of Ecological Engineering, 2022

Research paper thumbnail of Livelihood Diversification and Rural-Urban Linkages in Vietnam's Red River Delta

With high population density and limited land availability, Vietnam's Red River Delta is unde... more With high population density and limited land availability, Vietnam's Red River Delta is undergoing a major transformation as its economic base moves away from subsistence farming towards intensive, high-value food production for export and local urban markets, and nonfarm employment. This paper describes the changing livelihoods of the residents of two villages that represent two different pathways to local economic development. One village relies primarily on agricultural intensification and diversification, although in combination with nonfarm activities. These nonfarm activities are either supplementary (such as handicraft production and seasonal migration) or related to farming, such as provision of agricultural services, transport and trade of agricultural produce. To a large extent, it is this nonfarm income that allows investment in agriculture at the household level. Residents of the second village, although nominally still owning rice farms, have effectively moved out ...

Research paper thumbnail of Reliability and validity of the Vietnamese version of the 9‐item Utrecht Work Engagement Scale

Journal of Occupational Health, 2020

ObjectivesThe present study investigated the reliability and validity of a newly developed Vietna... more ObjectivesThe present study investigated the reliability and validity of a newly developed Vietnamese version of the 9‐item Utrecht Work Engagement Scale (UWES‐9‐V) in a sample of hospital nurses in Hanoi, Vietnam.MethodsThe UWES‐9 was translated into Vietnamese following a standard procedure. A survey was conducted of 949 registered nurses in a large tertiary general hospital in Hanoi, Vietnam, in 2018, using a self‐administered questionnaire including the Vietnamese UWES‐9, other scales measuring health status, work performance, job demand, job control, and workplace social support, and questions pertaining to demographic variables. Cronbach’s alpha and interclass correlation coefficients (ICC) were calculated to assess reliability. Explanatory and confirmatory factor analyses were conducted to assess factorial validity. Convergent validity was tested based on associations between the UWES‐9‐V and subscales and other scales.ResultsThe Cronbach’s alpha coefficients of the UWES‐9‐V ...

Research paper thumbnail of Wolf DF pmed.1001082

Research paper thumbnail of The Relationship between a Mega Sport Event and the Host Destination

International Journal of Tourism Sciences, 2014

Abstract Tourism and sport are key elements of the culture in many countries and can influence th... more Abstract Tourism and sport are key elements of the culture in many countries and can influence the behavior of society. Especially since the 1960’s, mega sport events have become a huge international draw card garnering a large amount of media attention, and attracting investment and also political interest. Tourism remains the world’s largest industry and continues to develop and grow. The aim of this study is to assess the relationship between a mega sport event and the host destination. To address the aim, the research was conducted in two stages: the first stage was a literature review which presents a deeper understanding of the two-way relationship: (i) Mega sport events create opportunities for the host destination and (ii) The host destination attracts tourists to attend the mega sport event. The second stage explores two methods destinations can use to host a mega sport event successful.

Research paper thumbnail of Response to “Questionable merits of the field trial of an oral killed whole cell cholera vaccine in Vietnam during 1998–2003” Vaccine 2007;25(8):1353–4

Research paper thumbnail of Post-licensure deployment of oral cholera vaccines: a systematic review

Bulletin of the World Health Organization, 2014

To describe and analyse the characteristics of oral cholera vaccination campaigns; including loca... more To describe and analyse the characteristics of oral cholera vaccination campaigns; including location, target population, logistics, vaccine coverage and delivery costs. We searched PubMed, the World Health Organization (WHO) website and the Cochrane database with no date or language restrictions. We contacted public health personnel, experts in the field and in ministries of health and did targeted web searches. A total of 33 documents were included in the analysis. One country, Viet Nam, incorporates oral cholera vaccination into its public health programme and has administered approximately 10.9 million vaccine doses between 1997 and 2012. In addition, over 3 million doses of the two WHO pre-qualified oral cholera vaccines have been administered in more than 16 campaigns around the world between 1997 and 2014. These campaigns have either been pre-emptive or reactive and have taken place under diverse conditions, such as in refugee camps or natural disasters. Estimated two-dose co...

Research paper thumbnail of Population Based Cohort Study for Pediatric Infectious Diseases Research in Vietnam

Tropical Medicine and Health, 2014

Research paper thumbnail of Drug‐resistant pneumococci in children with acute lower respiratory infections in Vietnam

Pediatrics International, 2008

Background: Acute lower respiratory infections (ALRI), primarily pneumonia, are the leading cause... more Background: Acute lower respiratory infections (ALRI), primarily pneumonia, are the leading cause of death in children under 5 years of age. Most of these deaths occur in Africa and southeast Asia. Increasing rates of drug resistance in pneumococcal strains emphasize the necessity of prevention of pneumococcal vaccines. The aim of the present study was to determine the frequency of drug resistance and the distribution of serotype of pneumococcal strains isolated from pediatric patients with ALRI in Vietnam.Methods: Two hundred and twenty pediatric patients with ALRI under 5 years of age were enrolled in Hanoi, Vietnam between 2001 and 2002. Bacterial pathogens with a heavy growth (106 c.f.u./mL) were isolated from nasopharyngeal secretions on quantitative culture. Fifty‐three pneumococcal strains isolated from the nasopharynx of pediatric patients were examined for antibiotic susceptibility including drug‐resistant genes and serotyping.Results: A total of 73.6% of pneumococcal strai...

Research paper thumbnail of Private Demand for Cholera Vaccines in Hue, Vietnam

Research paper thumbnail of Long-term effectiveness against cholera of oral killed whole-cell vaccine produced in Vietnam

Research paper thumbnail of Seroprevalence of rubella in the cord blood of pregnant women and congenital rubella incidence in Nha Trang, Vietnam

Vaccine, 2014

To investigate susceptibility to and factors associated with rubella infection among pregnant mot... more To investigate susceptibility to and factors associated with rubella infection among pregnant mothers and to estimate the burden of congenital rubella infection (CRI) in Vietnam where rubella-containing vaccine (RCV) is not included in the routine immunization programme, we conducted a prospective cohort study in Nha Trang, Vietnam between 2009 and 2010. Rubella-specific immunoglobulin-M and immunoglobulin-G were investigated in cord blood samples by enzyme immunoassay. Corresponding clinical-epidemiological data were analyzed and the national congenital rubella syndrome (CRS) incidence was estimated using modeling. We enrolled 1988 pairs of mothers aged 17-45 years and their newborn babies. No mothers had received RCV. Multivariate analysis revealed that mothers aged 17-24 (aOR 2.5, 95% CI: 1.7-3.8) or 25-34 (1.4, 1.0-2.1) years were more likely to be susceptible than those aged 35-45 years. Overall 28.9% (574/1988, 95% CI: 26.9-30.9%) of mothers were seronegative. The CRI rate was 151 (95% CI: 0-322) per 100,000 live births. Modeling estimated that 3788 babies (95% CI: 3283-4143) were born with CRS annually in Vietnam with an overall CRS incidence of 234 (95% CI: 207-262) cases per 100,000 live births. A substantial proportion of women of childbearing age (WCBA) are at risk of rubella infection during pregnancy and this can result in a high frequency of miscarriage or burden of CRS across Vietnam. Prompt introduction of RCV into national immunization programme with catch-up vaccination to children and WCBA will reduce CRI in Vietnam.

Research paper thumbnail of Outpatient treatment of children with severe pneumonia with oral amoxicillin in four countries: the MASS study

Tropical Medicine & International Health, 2011

Research paper thumbnail of Increased Rates of Intense Nasopharyngeal Bacterial Colonization of Vietnamese Children with Radiological Pneumonia

The Tohoku Journal of Experimental Medicine, 2007

Research paper thumbnail of Who is exposed to smoke at home? A population-based cross-sectional survey in central Vietnam

Research paper thumbnail of Association of environmental tobacco smoking exposure with an increased risk of hospital admissions for pneumonia in children under 5 years of age in Vietnam

Research paper thumbnail of Use of Oral Cholera Vaccines in an Outbreak in Vietnam: A Case Control Study

PLoS Neglected Tropical Diseases, 2011

Research paper thumbnail of Advantages of fluoroformates as carboalkoxylating reagents for polar reactants

The Journal of Organic Chemistry, 1990

ABSTRACT

Research paper thumbnail of A simple conversion of 1-chloroethyl carbonates to fluoroformates: value in the preparation of tertiary alkyl fluoroformates

The Journal of Organic Chemistry, 1990

Acknowledgment. Acknowledgment is made to the donors of the Petroleum Research Fund, administered... more Acknowledgment. Acknowledgment is made to the donors of the Petroleum Research Fund, administered by the American Chemical Society, for support of this re-search. Dr. K. Zaw is grateful to Loyola University and the Searle Foundation for a Searle Postdoctoral Fellow-ship. ...

Research paper thumbnail of Epidemiological Profile and Burden of Rotavirus Diarrhea in Vietnam: 5 Years of Sentinel Hospital Surveillance, 1998–2003

The Journal of Infectious Diseases, 2005