A fed-batch fermentation process for poly (3-hydroxybutyrate-co-3-hydroxyvalerate) production by Yangia sp. ND199 using molasses as substrate

A locally isolated halophilic bacterium, Yangia sp. ND199 was able to use molasses as substrate for copolymers poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] production. Cell dry weight (CDW) of 6.37 g/l, P(3HB-co-3HV) content of 43.1 wt% and P(3HB-co-3HV) concentration of 2.75 g/l were obtained by Yangia sp. after 60 h of cultivation in flask. In a batch cultivation mode in a fermentor, the CDW was increased to 9.1 g/l but P(3HB-co-3HV) content was decreased to 37 wt%. Fed-batch fermentation with two different nutrient feeding strategies was used. High CDW of 54.8 g/l was obtained after 54 h of cultivation but P(3HB-co-3HV) content was still low (39.8 wt%). Two-step fed-batch fermentation with two different nutrient feeding strategies was then designed. High CDW of 50 g/l and P(3HB-co-3HV) content of 52.9 wt% were obtained after 54 h of cultivation. The two-step fed-batch process designed here for the production of P(3HB-co-3HV) by Yangia sp. ND199 can be developed and used for further studies

CHOOSE REMEMBERSHIP REMEDIES TO IMPROVE THE HAPPINESS OF FEMALE OFFICERS AND OFFICERS UNIVERSITY OF FITNESS AND SPORTS DA NANG, VIETNAM

Happiness has long been a veritable area of scientific research in most industrialized countries. Using the method of synthesis of documents and interview method, the study investigates the current state of happiness of 30 female officers and employees of Danang University of Physical Education and Sports using the author's happiness scale. Michael Argyle and Peter Hills (2002) have shown: 30.0% less are happy; 43.33% are happy on average; 26.67% are moderately happy; the most important factor in happiness is health. Subject-selected measures that can increase happiness are finding moments with loved ones in the family; practising more positive thinking; accepting the reality of the situation; join arts and sports clubs

Comparison of behaviors regarding live poultry exposure among rural residents in Vietnam and Thailand

Introduction: Live poultry exposure and risk behaviors are more prevalent in rural communities, increasing the risk of influenza A/H5N1 infection. We examined the economic and socio-cultural influences on poultry-related practices by comparing the poultry-related practices among Vietnamese and Thai rural residents by family income and consumption preference. Methods: Stratified cluster sampling was performed to select households. Within each household, one adult was randomly selected for a face-to-face interview in five Vietnamese and five Thai rural districts. Using a standardized questionnaire to assess domestic poultry husbandry, live poultry purchase, and demographics, logistic regression enabled comparisons of behaviors related to live poultry exposure and examination of associated factors. Results: Among 994 Vietnamese and 907 Thai rural residents, live poultry exposure (prevalence of raising poultry, improper handling of sick or dead poultry, touching live poultry before buying, and slaughtering poultry at home) was more prevalent among Vietnamese than Thai respondents. After adjusting for other demographics, respondents with higher family incomes were less likely to rear backyard poultry in both Vietnam and Thailand, and with more likely to buy live poultry in Vietnam, but not in Thailand. Consumption preference for live poultry was associated with being more likely to rear backyard poultry in Vietnam and Thailand, and with being more likely to buy live poultry in Thailand, but not in Vietnam. Conclusion: The findings suggest important roles of economic imperatives and cultural preference for live poultry for consumption in supporting poultry rearing and live poultry purchase among rural residents. © 2014 Liao et al.published_or_final_versio

SOCIAL-EMOTIONAL SKILLS IN STUDENTS’ LEARNING IN CAN THO UNIVERSITY, VIETNAM

Based on an overview of domestic and foreign research related to the research field of the topic; the research of the topic has determined the urgency of the topic, research objectives, research objects and scope, research hypotheses, research tasks, and methods. The research on the topic has systematized the theoretical basis for the concept and manifestation of social-emotional skills in student learning: generalizing the picture of the current situation of recognizing the importance of social-emotional skills in student learning, the level of assessment of the manifestation and educational measures of social-emotional skills in learning, and finding out the factors that affect social emotions in student learning such as from the external environment, at school, family and external social relationships. Factors from the internal environment are the self-awareness of each student. From the current situation of the problem, the study has proposed educational measures for 504 students from 8 schools and colleges in Can Tho University (CTU), Vietnam. Some measures were to educate social-emotional skills for students through soft skills topics, teach soft skills to students through extracurricular activities, and soft skills education for students through integrated teaching.  Article visualizations

Phase Structure of Bose - Einstein Condensate in Ultra - Cold Bose Gases

The Bose - Einstein condensation of ultra - cold Bose gases is studied by means of the Cornwall - Jackiw - Tomboulis effective potential approach in the improved double - bubble approximation which preserves the Goldstone theorem. The phase structure of Bose - Einstein condensate associating with two different types of phase transition is systematically investigated. Its main feature is that the symmetry which was broken at zero temperature gets restore at higher temperature

Gestational diabetes diagnosed in third trimester of pregnancy: an observation at a Hospital of Women and Children in Vietnam

Background. Gestational diabetes mellitus (GDM) remains a significant concern within the medical community due to its high risk, as well as its serious side effects on both the mothers and the fetuses. This study aims to assess the prevalence and the risk factors of gestational diabetes mellitus in pregnant women at Da Nang Hospital for Women and Children.Methods. A cross-sectional study was conducted on 706 pregnant women at 2428 weeks of gestation at Da Nang hospital to determine the prevalence of gestational diabetes. Multivariate regression analysis was used to clarify the independent risk factors associated with gestational diabetes. All participants were interviewed and tested for the oral glucose tolerance test (OGTT) to identify the number of gestational diabetes, which was diagnosed according to the American Diabetes Association (ADA) diagnostic criteria in 2014.Results. Gestational diabetes prevalence was 10.2%; categorized by the number of matched diagnostic criteria: 1 criterion: 7.1%; 2 criteria: 2.1%; 3 criteria: 1.0%. There are four independent risk factors for gestational diabetes determined through multivariate regression analysis: maternal age > 30 years (OR = 2.376), a history of gestational diabetes (OR = 12.211), pre-pregnancy BMI ≥ 23 kg/m2 (OR = 10.775), a history of fetal macrosomia > 3800 g (OR = 4.655). The risk of gestational diabetes in the group with risk factors was 6.21 times higher than that in the group with no risk factors.Conclusion. More attention should be paid to the risk factors for gestational diabetes, such as maternal age > 30 years, a history of gestational diabetes, pre-pregnancy BMI ≥ 23 kg/m2, a history of fetal macrosomia > 3800 g in all pregnant women

Conamomum odorum , a new species of Zingiberaceae from central Vietnam

Conamomum odorum is described as a new species from Khanh Hoa Province, Central Vietnam. It is characterized by sweet smell, striate and narrowly elliptic leaf leaves with short petiole and ligule, ovoid congested inflorescence, pubescent calyx, cream corolla lobes, yellow, obovate and reflexed labellum with median red bands at base and hairy ovary. The new species is illustrated with detailed photographs of key characters and morphologically compared to its closest congeners C. piereanum and C. rubidum. A distribution map of the genus in Vietnam is provided.

ẢNH HƯỞNG CỦA NỀN ĐÁY CÁT VÀ ĐÁ SỐNG LÊN CHẤT LƯỢNG MÔI TRƯỜNG BỂ NUÔI CÁ CẢNH BIỂN

Marine ornamental aquarium is more and more popular. Nowadays, biofiltration system can convert nitrogen from toxic forms (NH4+/NH3, NO2-) into a less toxic form (NO3-), which creates a better water quality for the development of ornamental fishes in aquarium tank. This experiment was carried out to evaluate the efficiency of environmental quality by supplementation of sand and live rock in aquarium tank. There were two treatments with rock and sand supplement to the bottom of the tanks (NT1) and tanks without rock and sand added (NT2). There were 3 replicates for each treatment and the experiments were carried out in ten weeks. Results showed that sand and live rock could improve water quality and play as good place for fish and other creature hiding and reduce the water used. Water temperatures were 28.69oC (NT1) and 28.80oC (NT2), pH was about 8.13, salinity ranged from 34‰ to 35‰ in both treatments. NH4+was 0.035 ± 0.003 mgN/ml in the two treatments. After 2 weeks of putting fish in the experimental tanks NO2- values were 0.023 mgN/l (in treatment NT2) and 0.018 mgN/l (in treatment NT1). The average values of NO2- for whole experimental period in the NT1 and NT2 were 0.008 ± 0.001 mgN/l and 0.010 ± 0.002 mgN/l, respectively (P = 0.061). NO3- values were not significantly different between the two treatments (P 0.05). However, the ratio of NO2-/NO3- in NT1 was lower compared to this value in NT2 (NT1: 0.15 ± 0.03% and NT2: 0.39 ± 0.09%, P = 0.018). This paper provides an important reference to help aquarists to design and control their ornamental aquarium tank suitably.Hệ thống lọc sinh học là nơi sinh sống của các vi khuẩn ni trat hóa - các vi khuẩn có vai trò chuyển hóa ni tơ thải ra từ cá và vật nuôi ở dạng độc (NH4+/NH3) sang dạng ít độc hơn (NO3-). Các vi khuẩn này sống bám trên các giá thể như đá và cát. Thí nghiệm đánh giá hiệu quả cải thiện chất lượng môi trường của việc bổ sung nền đáy cát và đá vào bể nuôi cá cảnh biển. Thí nghiệm bao gồm 2 nghiệm thức. Nghiệm thức 1 (NT1): Bổ sung đá sống và cát vào bể nuôi và nghiệm thức 2 (NT2): Bể nuôi có đáy trần. Mỗi nghiệm thức có kết quả thí nghiệm cho thấy, bổ sung nền đáy cát và đá sống vào bể nuôi đã đem lại hiệu quả cải thiện rõ rệt các muối dinh dưỡng nitơ từ dạng có độc hại cho vật nuôi sang dạng ít độc hơn. Nhiệt độ 28,69oC (NT1) và 28,80oC (NT2), pH xấp xỉ 8,13 và độ mặn dao động 34–35‰ ở cả 2 nghiệm thức thí nghiệm. NH4+ở cả 2 nghiệm thức có giá trị trung bình 0,035 ± 0,003 mgN/ml. Sau 2 tuần thả cá, hàm lượng NO2- 0,023 mgN/l (NT2) và 0,018 mgN/l (NT1). NO2- trung bình ở NT1 và NT2 lần lượt là 0,008 ± 0,001 mgN/l và 0,010 ± 0,002 mgN/l (P = 0,061). Hàm lượng NO3- giữa 2 nghiệm thức không khác nhau có ý nghĩa thống kê (P 0,05). Tuy nhiên, tỷ lệ NO2-/NO3- ở NT1 nhỏ hơn có ý nghĩa thống kê so với NT2 (NT1: 0,15% ± 0,03% và NT2: 0,39% ± 0,09%, P = 0,018). Ngoài ra việc bổ sung nền đáy cát và đá sống tạo sinh cảnh và tạo nơi ẩn nấp cho cá. Đồng thời cũng giúp hạn chế thay nước và vệ sinh nền đáy của bể nuôi có đáy cát và đá sống. Kết quả nghiên cứu là cở sở khoa học quan trọng để bổ sung đá sống và cát trong bể nuôi cá cảnh tại Bảo tàng Hải dương học