• Title, Summary, Keyword: TRA

Search Result 216, Processing Time 0.034 seconds

Isolation, Physicochemical Properties and Toxicities of Territrem A' and B'

  • Ling, Kuo Huang;Peng, Fu Chuo;Chen, Bai Jiun;Wang, Yu;Lee, Gene Hsiang
    • Korean Journal of Pharmacognosy
    • /
    • v.17 no.2
    • /
    • pp.153-160
    • /
    • 1986
  • We have isolated two new metabolites of territrem, designated as territrem $A'\;(TRA';\;C_{28}H_{30}O_{10})$ and $B'\;(TRB';\; C_{29}H_{34}O_{10})$ from chloroform extract of rice culture of Aspergillus terreus 23-1, using the same isolation procedure as that for territrem A, B and C(TRA, TRB, TRC). The present isolation procedure gave about 5 mg of TRA' and 10 mg of TRB' from 4 kg of rice culture per batch. Analysis of the high resolution mass spectrum showed that the molecular composition of TRA' and TRB' are $C_{28}H_{30}O_{10}$ and $C_{29}H_{34}O_{10}$ respectively, Some results of physicochemical properties were presented in this paper. Single crystal X-ray diffractometry of TRB' showed that the three dimensional structure of TRB' has not changed significantly from that of $TRB\;(C_{29}H_{34}O_9)$, except for the insertion of one oxygen atom into TRB to make additional pyran in the E-ring. It is also suggested that the aromatic moiety of TRA' is similar to that of $TRA\;(C_{28}H_{30}O_9)$ and the rest non-aromatic portions resemble to those of TRB'. The tremorgenic activity, lethality and inhibitory effect on acetylcholine esterase of TRA' and TRB' are greatly reduced comparing to that of TRA and TRB.

  • PDF

Tra2${\alpha}$ and hnRNP K might be Functional Partners of Rbm for Regulation of RNA Processes during Spermatogenesis

  • Lee, Jungmin;Kim, Euisu;Jang, Sung Key;Rhee, Kunsoo
    • Animal cells and systems
    • /
    • v.8 no.1
    • /
    • pp.65-70
    • /
    • 2004
  • Rbm is a male infertility gene located in the AZFb region of the Y chromosome. Expression pattern of Rbm indicates that Rbm is critical for early phase of male germ cell development. It shares strong structural homology with hnRNP G, suggesting a function as an RNA processing factor. In order to gain a clue on the molecular mechanisms of Rbm on male germ cell development, we examined interactions of Rbm with selected proteins in yeast. The results revealed specific interactions between Rbm, hnRNP K and Tra2${\alpha}$. These results suggest that hnRNP K and Tra2${\alpha}$ may be functional partners of Rbm in male germ cells. We propose a model in which hnRNP K may playa role as a platform for Rbm and Tra2${\alpha}$.

Thermal Comfort and Tactile Wearing Performance of Wool/nylon Fabrics for Tra-biz Garment (울/나일론 tra-biz 의류용 직물 소재의 열적 쾌적성과 착용특성)

  • Kim, Hyun Ah
    • Fashion & Textile Research Journal
    • /
    • v.18 no.6
    • /
    • pp.878-888
    • /
    • 2016
  • In this study, wool/nylon(50/50%) blend yarn and its fabrics for tra-biz(complex word of travel+business) garment were prepared, and its wear comfort characteristics were investigated through thermal manikin and human-body wearing experiment. In addition, tactile wearing performance from fabric mechanical properties and the dimensional stability and the pilling of the fabric specimen during wearing and dry-cleaning were measured and compared with those of wool 100% fabric specimen. Heat keepability of the wool/nylon(50/50%) blend fabric by thermal manikin experiment was superior than that of wool 100% fabric, this result was verified with human-body wearing experiment and its result coincided well with this experimental result. Tactile wearing performance of the wool/nylon(50/50%) fabric from fabric mechanical properties measured by FAST system was better than that of the wool 100% fabric. The dimensional stability of the wool/nylon(50/50%) fabric was more stable than that of the wool 100% fabric. Because relaxation shrinkage was lower and hygral expansion of wool 100% fabric was more high. However, the breathability and pilling property of the wool/nylon(50/50%) fabric were inferior than those of the wool 100% fabric. The possibility of application for tra-biz garment of wool/nylon(50/50%) blend fabric was observed because of good heat keepability, tactile wearing performance and washing fastness.

The Study on People's Satisfaction towards Public Services of Viet Nam: Evidence of Tra Vinh Provincial Center of Public Administrative Services

  • NGUYEN, Ha Hong
    • The Journal of Asian Finance, Economics, and Business
    • /
    • v.6 no.2
    • /
    • pp.183-187
    • /
    • 2019
  • The paper aims to provide some recommendations to improve the operational capacity of the Tra Vinh Provincial Center of Public Administrative Services and to improve the effectiveness and efficiency of management in the State administrative agencies. The study on people's satisfaction towards public services of Tra Vinh Provincial Center of Public Administrative Services was conducted by collecting primary data of 300 people who used public services provided by this Center from September 2018 to November 2018. By using the multivariate regression method, the author found that there were a number of factors affecting people's satisfaction towards public services at the Center, including procedures, service fee, and attitudes of the staff, empathy, staff capacity, and trust. These factors had an impact on people's satisfaction towards public administrative services performed by staff officers from Tra Vinh Provincial Center of Public Administrative Services. Since then, the study has proposed policy implications to improve people's satisfaction on service quality at the Center such as: Develop a flexible charge mechanism of public services; Enhance the sense of responsibility of staff officers; Pay attention to improving administrative procedures; Establish trustworthiness to people; Pay attention to professional improvement; and Build up a friendly and respectful team of staff.

Individual Customers' Access to Credits at Commercial Banks in Viet Nam: The Case of Tra Vinh Province

  • NGUYEN, Ha Hong
    • The Journal of Asian Finance, Economics, and Business
    • /
    • v.7 no.9
    • /
    • pp.371-376
    • /
    • 2020
  • The study seeks to explore the factors affecting the access to credits by individual customers at commercial banks in Tra Vinh province, Vietnam. Based on these results, the author proposes solutions to further improve the ability to serve individual customers at commercial banks in the province in the future. The study was conducted with a method of collecting primary data of 300 individual customers including 150 people with access to credits and 150 people without accessing to credits at six commercial banks in Tra Vinh Province, Viet Nam - Bank of Agriculture and Rural Development, Bank for Foreign Trade Commercial Bank, Bank for Investment and Development of Vietnam, Asia Commercial Bank in Tra Vinh, Sai Gon Commercial Joint Stock Bank, and Bank of East Asia. The author has used binary regression methods, and the study found that seven factors affecting the ability of individual customers to access capital, namely, career, qualifications, collaterals, incomes, documents, loan and business plans, and experience. In particular, occupation, experience, and documents are the most influential factors. From the above results, the author proposes policy implications to improve individual customers' access to credits at commercial banks in Tra Vinh province in the near future.

Changes of the Pharyngeal Space by Various Oral Appliances for Snoring (수종의 코골이장치 장착에 따른 인두공간의 변화)

  • Jo, Chul-Bae;Kim, Mee-Eun;Kim, Ki-Suk
    • Journal of Oral Medicine and Pain
    • /
    • v.34 no.3
    • /
    • pp.247-256
    • /
    • 2009
  • The purpose of this study was to investigate the changes of the pharyngeal space when the following appliances were inserted: the mandibular advancement appliance (MAA), tongue retaining appliance (TRA), and mandibular advancement-tongue retaining appliance (MATRA). Nine male dental students exhibiting Class I occlusion, normal body mass index (BMI), and no signs and symptoms of snoring were selected for this study. The three kinds of snoring appliances (MAA, TRA and MATRA) were fabricated for each subject. The mandibular advancement of the MAA and MATRA was set at a distance of 5 mm, and the TRA and MATRA were made to hold the tongue in front of the maxillary incisors by 10 to 20 mm. Lateral cephalometric radiographs of the following four states - with no appliance, MAA, TRA, and MATRA - were taken to examine any anatomical changes resulting from the application of the appliances. All four radiographs were traced and analyzed for twenty selected variables related to the pharyngeal space, cranio-cervical posture, and position of the soft palate and hyoid bone. According to the results of this study, there were significant increases in both the upper and lower oropharyngeal spaces when the mandible and tongue were protruded simultaneously, although there was a significant increase only in upper oropharyngeal space when the mandible or tongue was advanced separately. In conclusion, it is suggested that the MATRA may result in more positive effect on the control of snoring and OSA compared to a single use of the MAA or TRA, especially for the patients whose upper airway obstruction occurs in the lower oropharynx.

Kinetics of the KOH Catalyzed-Methanolysis for Biodiesel Production from Fat of Tra Catfish

  • Huong, Le Thi Thanh;Tan, Phan Minh;Hoa, Tran Thi Viet;Lee, Soo
    • Journal of the Korean Applied Science and Technology
    • /
    • v.25 no.4
    • /
    • pp.418-428
    • /
    • 2008
  • Transesterification of fat of Tra catfish with methanol in the presence of the KOH catalyst yields fatty acid methyl esters (FAME) and glycerol (GL). The effects of the reaction temperature and reaction time on rate constants and kinetic order were investigated. Three regions were observed. In the initial stage, the immiscibility of the Tra fat and methanol limited the reaction rate, hence this region was controlled by the mass transfer. Subsequent to this region, produced FAME like a co-solvent made the reaction mixture homogeneous, therefore the conversion rate increased rapidly so it was controlled by the kinetic parameters of the reaction until the equilibrium was approached in the final slow region. A second-order kinetic mechanism was proposed involving second regions for the forward reaction. The rate determining step for the overall KOH catalyzed-methanolysis of Tra fat was the conversion of triglycerides (TG) to diglycerides (DG). This rate constant was increased from 0.003 to $0.019min^{-1}$ when the reaction temperature was increased from 35 to $60^{\circ}C$. Its calculated activation energy was 14.379 ($kcal.mol^{-1}$).

Factor Affecting Poverty and Policy Implication of Poverty Reduction: A Case Study for the Khmer Ethnic People in Tra Vinh Province, Viet Nam

  • Nguyen, Ha Hong;Nguyen, Nhan Van
    • The Journal of Asian Finance, Economics, and Business
    • /
    • v.6 no.1
    • /
    • pp.315-319
    • /
    • 2019
  • The paper aims to investigate empirical causes of poverty of the Khmer ethnic people and suggest policy implication to help the Khmer ethnic people escape poverty in Tra Vinh province and the Mekong Delta. The study has been conducted with direct interviews with 300 Khmer households living in seven districts and cities in Tra Vinh province and with the use of multivariate regression. The research results show that a number of causes that affect poverty of poor households include lack of capital for production, lack of means of production, poor health and lack of labor, large families, lack of job opportunities or unemployment, and lack of willingness to escape poverty and education. Thus, there should be poverty reduction policy for the poor househlods in the coming time. Based on the current situation and regression results, the authors propose a number of recommendations: 1) Focus on preferential loan policies for poor people 2) Provide occupational training programs for improving incomes for the Khmer ethnic households 3) Build up special infrastructure in the Khmer ethnic areas 4) Focus on promoting cultural and belief institutions in areas of the Khmer ethnic people and 5) Improve and build up healthcare clinics services and facilities.

Implementation of TRL and TRA tools to Korean Construction and Transportation R&D Evaluation for Improving Practical Use (국가 건설교통 R&D 사업의 실용화 향상을 위한 기술성숙도평가 기반 R&D 평가모델 수립에 관한 연구)

  • Kim, Nam-Gyun;An, Byung-Ho;Lee, Hyun-Seok;Choi, Jae-Hong;Park, Sang-Hyuk;Kim, Yea-Sang
    • Korean Journal of Construction Engineering and Management
    • /
    • v.13 no.4
    • /
    • pp.110-119
    • /
    • 2012
  • Recently as the advent of knowledge-based competition, the major industrialized countries including Korea, are expanding their R&D investment and promoting policies for diffusing of R&D performance. For this, NASA, DoD and such agencies in the United States define Technology Readiness Level (TRL) as a quantified indicator for performance management, and also impose Technology Readiness Assessment (TRA) as a evaluation system, that evaluates technology maturity using TRL. These tools are judged to be very effective in R&D projects especially with the object of practical use. When this concept is applied to the domestic national construction and transportation R&D project for the purpose of practical use, it is expected that the evaluation system overcomes its weakness of focusing only on academic results and improves significantly on intent of achieving practical use. Thus in this study, TRL/TRA implementation model of construction and transportation R&D project for achieving purpose of practical use is presented through an analysis of TRL/TRA concept and domestic national construction and transportation R&D project's characteristics and current evaluation/management system.

A Framework for Deriving Investment Priority in National Defense R&D - Using DEA based on TRA - (국방연구개발 투자우선순위 도출 프레임워크 - TRA 방법론에 기반한 DEA 중심으로 -)

  • Yu, Donghyun;Lim, Dongil;Seol, Hyeonju
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.21 no.2
    • /
    • pp.217-224
    • /
    • 2018
  • The purpose of this study is to evaluate the future potential value of CTE(Critical Technology Element)s that are evaluated to be low in TRA(Technology Readiness Assesment) and to present investment prioritization technologies in defense R&D(Research and Development) based on them. To do this, we used the DEA(Data Envelopment Analysis) method, which is useful in evaluating the efficiency of the organization. Specifically, we suggest a systematic framework to evaluate the future value of CTEs by setting the CTEs derived from the TRA process to DMU(Decision Making Unit)s, the cost and time required to develop each CTE as the input factor of the DEA and the effects of the development of each CTE as the output factor of the DEA respectively. We also conducted an illustrative case study on radar technologies to demonstrate the usefulness of the proposed approach.