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Search Results: 1 - 10 of 1653 matches for " Truong Thi Cam Trang "
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Fabrication and Characterization of Pulp/Chitosan Composite Membranes Crosslinked with 3-Methylglutaric Anhydride for Pervaporation of Ethanol/Water Mixture  [PDF]
Truong Thi Cam Trang, Nguyen Thi Nhung, Takaomi Kobayashi
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.32014
Abstract: Chitosan/Cellulose (CTS/CL) composite membranes were prepared by cross-linking reaction with 3-methy- lglutaric anhydride (3MGA). The cross-linked membranes with CTS/CL were obtained at different CTS con- tents in variations from 50 to 100 wt%, and these membranes were applied in the dehydration of ethanol/wa- ter mixtures. Especially, it was observed that in the case of a composite membrane containing chitosan 80% (CTS/CL-80/20) showed a performance with a separation factor of α = 17.1 and a total permeation flux of J = 326 g/(m2h). It was observed that the total permeation flux decreased when the cross-linking increased and the increase in the ethanol content in the feed solution showed an increase in the separation factor. The CTS/ CL-80/20 showed excellent performance with good mechanical strength and dehydration performance in the ethanol/water mixture separation.
Fabrication and Characterization of CTS/Coconut Composite Membranes Crosslinked with Glutaraldehyde for Elimination of Heavy Metal in Aqueous Solution  [PDF]
Truong Thi Cam Trang, Nguyen Quang Huy, Takaomi Kobayashi
Journal of Agricultural Chemistry and Environment (JACEN) , 2019, DOI: 10.4236/jacen.2019.82006
Abstract: Chitosan/coconut (CTS/coconut) composite membranes were successfully prepared by the cross-linking reaction with glutaraldehyde and they were applied in eliminating heavy metals from aqueous solutions. The cross-linked membranes were obtained at the ratios of 1/1, 1/1.5 and 1/2 and the coconut fiber was chemically treated by NaOCl/NaOH. The best ratio of CTS/coconut fiber is found to be 1/1.5 which has a relatively high stability with the degree of swelling (DS) and solvent content (SC) of membrane to be 13.33% and 69.88%, respectively. The results also indicate that the CTS membranes showed preferential separation of heavy metals for blend CTS/coconut membranes.
Preparation and Biological Properties of Platinum(II) Complex-Loaded Copolymer PLA-TPGS
Ha Phuong Thu,Phan Thi Hong Tuyet,Mai Thi Thu Trang,Nguyen Hoai Nam,Truong Thi Nhu Hieu,Le Quang Duong,Tran Thi Nhu Hang,Tran Thi Hong Ha,Do Huu Nghi,Le Huu Cuong,Le Mai Huong
Journal of Nanomaterials , 2013, DOI: 10.1155/2013/768628
Abstract: A new nanodrug system containing bis(menthone thiosemicarbazonato) Platinum(II) complex (Pt-thiomen) encapsulated with the block copolymers polylactide-d-α-tocopheryl polyethylene glycol 1000 succinate (PLA-TPGS) was prepared by a modified solvent extraction/evaporation technique. The characteristics of the nanoparticles including surface morphology, size distribution, structure, and biological activities such as antimicrobial and cytotoxic activities were in vitro investigated. The spherical nanoparticles were around 50?nm in size with core-shell structure and narrow-size distribution. The encapsulated Pt-thiomen can avoid interaction with proteins in the blood plasma. The inhibitory activity of Pt-thiomen-loaded PLA-TPGS nanoparticles on the growth of some bacteria, fungi, and Hep-G2 cells suggests a possibility of developing PLA-TPGS-Pt-thiomen nanoparticles as one of the potential chemotherapeutic agents. 1. Introduction Platinum(II) complexes, one of the most potent anticancer drugs, have been used for treatment against a variety of human cancers [1, 2]. They are effective cytotoxic agents in the treatment of epithelial malignancies such as lung, head and neck, ovarian, bladder, and testicular cancer [3]. However, their clinical applications is restricted because almost all platinum in the blood plasma are often bound by protein after intravenous injection [4]. The binding of Pt(II) complexes with proteins reduces the urinary excretion of platinum and causes the deposition of Platinum in tissues [5]. The action with proteins causes many side effects including renal and auditory toxicity, nausea, and vomiting [6–8]. The development of drug delivery systems in the last several decades has provided a variety of methods including the incorporation of drugs into liposomes, lipid emulsions, and polymeric micelles to reduce adverse effects, to increase their solubility, and to prolong circulation time as well [9–12]. More recently, a promising approach which has attracted much attention of researchers is the encapsulation of platinum-based anticancer drugs in sterically stabilized polymeric micelles. This strategy has succeeded in reducing toxicity and improving efficacy of encapsulated platinum complex due to an excellent stability in plasma and a much longer circulation time as compared to free Pt(II) complexes [13–16]. The in vitro test on antimicrobial activity of the series of platinum(II) complexes by the macrodilution method was also reported by Utku et al. [17]. Some synthesized complexes might be taken into consideration as promising antifungal
Food Security versus Food Sovereignty: Choice of Concept, Policies, and Classes in Vietnam’s Post-Reform Economy
Tran Thi Thu Trang
Kasarinlan : Philippine Journal of Third World Studies , 2011,
Abstract: This article discusses two important concepts of food security and food sovereignty in the context of Vietnam’s post-reform economy. It examines Vietnam’s persistent choice of the food security framework, its resulting policies and their implications. The article argues that the choice of food security framework has served to justify the promotion of industrial agriculture and international trade. While this model has led to increased food productivity, it failed to guarantee access to and quality of food, the other two important pillars of the food security framework. More important, the article argues that the continued adoption of food security and industrial agriculture is not neutral but reflects the shifting position of the Vietnamese government away from the peasantry for the benefits of capital accumulation by other classes.
A Review of Horwitz, Horwitz and Cope’s Theory of Foreign Language Anxiety and the Challenges to the Theory
TRAN Thi Thu Trang
English Language Teaching , 2012, DOI: 10.5539/elt.v5n1p69
Abstract: Language anxiety has become a great concern in second and foreign language learning research over the last three decades, and is a topic that triggers significant differences of opinions. As the first theory that emphasises the specific nature of foreign language anxiety, Horwitz, Horwitz, and Cope’s theory of foreign language anxiety has been used in quite a number of studies in the field. This paper reviews the theory and discusses the criticisms that other researchers have put forward it with an aim to provide further understanding of the theory for those who are interested in involving foreign language anxiety in their research.
Seroprevalence of Mycoplasma bovis Infection in Dairy Cows in Ho Chi Minh, Vietnam  [PDF]
Dung Van Nguyen, Chau Kim Thi Truong
Open Journal of Veterinary Medicine (OJVM) , 2015, DOI: 10.4236/ojvm.2015.55016
Abstract: A cross-sectional study was carried out to investigate the seroprevalence of M. bovis. A total of 606 serum samples were randomly collected from dairy cows in Ho Chi Minh City, Vietnam. Commercial ELISA kit was used for detection of antibody to M. bovis. The results indicated that overall seroprevalence was 80.2% (486/606). There were no significant differences between regions or age categories (P > 0.05). Degree of infection to M. bovis commonly distributed at positive degree 1 (68.5%) and 2 (24.1%). Seroprevalence at highest positive degree 4 were found in District 9, District 12 and Thu Duc (6.7%, 6.3% and 1.6%, respectively). This study is the first report of seroprevalence of M. bovis in Vietnam. The results suggested that M. bovis was spreading among dairy cow populations although degree of positivity was low. It should be considered as a high risk pathogen to dairy cows in Vietnam.
Estimation of Waste Generation and Recycling Potential from Traditional Market: A Case Study in Hue City, Vietnam  [PDF]
Yasuhiro Matsui, Do Thi Thu Trang, Nguyen Phuc Thanh
Journal of Environmental Protection (JEP) , 2015, DOI: 10.4236/jep.2015.64031
Abstract: This study was conducted to provide a detailed description of waste generation and characteristics from a traditional market in Hue city, located in central Vietnam. The authors conducted a waste generation survey and a waste composition survey for 309 stalls/vendors in five markets by 17 business categories for 10 consecutive days. The waste generation rates by stall/vendor and by floor area were assessed in three waste categories: general waste, recyclable, and food residues. The general waste that would be sent to a landfill site was classified into 10 physical categories and 77 sub-categories. For general waste, food waste accounted for the largest part, followed by plastic and grass. By multiplying the waste generation rate by stall/vendor by the total number of stall/vendors in 23 markets, the authors estimated the total amounts of general waste, recyclable, food residue and total waste by business category. The total waste generated from market was 17.0 tons/day, of which 4.6 tons (27.1%) were collected by pig farmers for feeding livestock and 0.6 tons (3.6%) were sold to the recycling market. The composting potential accounted for 55.2% of total waste generation from the traditional market in Hue. The recycling potential accounted for 5.1%. The total disposal amount sent to the landfill site would be reduced from 69.2% to 8.8% of the total. The 95% confidence interval (CI) of total waste amount from 23 markets was also estimated using Monte Carlo simulation based on the mean and standard error of the waste generation rate. The range of 95% CI was 14.9 - 18.9 tons/day.
Development and Validation of the Self-Esteem Scale of Toulouse (ETES) in Vietnam  [PDF]
Trinh Thi Linh, Tran Thu Huong, Ngo Mai Trang
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.51010
Abstract: Self-esteem is no longer a new concept in the field of psychology in the whole world in general as well as in Vietnam in particular. There is a rich diversity of self-esteem measurement tools that have been devised and developed. However, in Vietnam, most of the researchers only use the original measurement tools without adapting them to the cultural-social context of Vietnam. Hence, this research aims to evaluate the construction and reliability of an existing popular measurement tool of self-esteem in Europe—which is ETES—in the context of Vietnamese culture. An empirical study was conducted in Vietnam and 1505 valid responses of adolescents were collected. Five sub-scales— which are physical self, emotional self, academic-future self, social self and familial self—were identified through an exploratory factor analysis. The last dimension (familial self) is considered a typical self-esteem area of Vietnamese adolescents. The test-retest reliability demonstrates strong reproducibility of the self-esteem scale and subscales. This new tool is useful for examining how often adolescents in Vietnam evaluate their self-esteem.
Case Report: Acute Fatty Liver of Pregnancy  [PDF]
Huynh Nguyen Khanh Trang, Hoang Thi Diem Tuyet
Open Journal of Obstetrics and Gynecology (OJOG) , 2017, DOI: 10.4236/ojog.2017.710102
Abstract: Acute fatty liver of pregnancy (AFLP) is a rare disease in Vietnam. Diagnosis by recorded literature is often difficult to distinguish from viral hepatitis, paraplegia, or bile duct disease, so AFLP diagnosis is often delayed. The prevalence of hepatitis B in Vietnam in pregnant women is estimated at 10% REF _Ref494526757 \r \h [1], preeclampsia is estimated at 0.2% REF _Ref494526760 \r \h [2]. A case pregnant woman has 35.5-week gestational age with AFLP, who was safely delivered both mother and infant at Hung Vuong hospital, Vietnam. A careful history and physical examination, in conjunction with compatible laboratory and ultrasound imaging results, are often sufficient to make the diagnosis, and liver biopsy is rarely indicated. Intensive adjuvant therapy and rapid birth control are essential for maternal and fetal outcomes.
Death Attitudes and Perception about the Death of the Vietnamese Elderly  [PDF]
Hoang Moc Lan, Trinh Thi Linh, Ngo Mai Trang
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.510026
Abstract:
This study aims to examine the death attitudes and perception about the death of the elderly in Vietnam in the current period. Using the scale based on the research work of Wong and his colleagues (1994) and concepts of Buddhism, the study was performed on 959 elderly people in three areas: The Nord, the Centre and the South of the country. Results of data analysis show that only a part of the studied believe in afterlife. They tend to believe that their death is caused by pain, sadness and missing dear people instead of the supernatural that force them to die. Concerning death attitudes, we note that the majority of the studied will make actions expressing their willingness to accept death. Age, education, gender and life arrangement affect death perception as well as death attitudes in which we also note the difference by self-reported health and satisfaction of material life.
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