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• Evaluating The Growth and Yield of Oyster Mushroom Strains (Pleurotusspp.) Cultured on Rice Straw

  Nguyen Thi Bich Thuy, Nguyen Thi Lam Hai, Nguyen Thi Luyen, Tran Dong Anh, Nguyen Van Giang, Nguyen Thi Ngoc

  Received: 09-06-2017 / Accepted: 12-12-2017

   Abstract PDF (VIETNAMESE)

  Oyster mushroom (Pleurotus spp.) is a delicious edible fungus with high nutritional and medicinal values. Itcontains all essential amino acids and several polysaccharides.Five strains of oyster mushroom werecultivated on rice straw sterilized at 121oC for 100 min and on rice straw piled for6-7 days at 60-70oC. The results showed that of5 oyster mushroom strains, PN1 showed the highest growth rate. In addition, sterilized straw was the most suitable material for the growth of PN1 with bio-efficiency at 73.8%. For further investigation, PN1 was cultured on a mixture of different materials including straw and some agricultural wastes such as cotton seed hull, sawdust, husk, and rice bran. It showed that the mix(in percent) with straw (84), cotton seed hull (10), rice bran (5) and CaCO3(1)was the best medium for the mycelial growth and fruitingbody yield and the bio-efficiency of PN1reached 77.4%.

• The Effects of Logistics on Business Performance of the Garment Firms in Hanoi

  Nguyen Thi Thu Trang, Nguyen Hai Nui, Doan Thi Ngoc Thuy

  Received: 10-08-2020 / Accepted: 04-11-2020

   Abstract PDF (VIETNAMESE)

  The purpose of the study was to identify logistics factors affecting the business performance of garment enterprises in Hanoi city. The survey was conducted on a database of 109 garment enterprises in Hanoi by using the surveying methods (interview by phone, mail, sample interview on google Docs and face-to-face) and face-to-face, the collected data were analyzed by factor analysis (EFA). The results showed that five logistics factor groups had positive effects on garment firms’ performance. The research Model has indicated that using reasonably logistics costs, improving the quality of output logistics. The appropriate recommendations should be simultaneously applied following 6 solutions: (1) Investing in modern facilities and equipment for logistics operations at garment enterprises; (2) Building a close relationship with distribution intermediaries; (3) Managing the plans of input materials; (4) Improving the qualifications and capabilities of logistics staff; (5) Enhancing the enterprise inventory management; (6) Promoting the application of information technology in logistics services.

• Study on the Design of the Tube-Type Vacuum Honey Concentrator with Liquid Ring Partsand UltrasonicDevice Combination to Prevent the Crystallization

  Dang Thanh Son, Tran Nhu Khuyen, Nguyen Thanh Hai

  Received: 29-06-2020 / Accepted: 14-08-2020

   Abstract PDF (VIETNAMESE)

  The CD-1 tube-type vacuum honey concentrator with a liquid ring has been designed and manufactured based on the new principle, using the liquid ringand ultrasonic deviceto increase theevaporationabilityand crystallizationinhoneyto enhancing the quality of honey products during the condensed process.The single-case experiments have been appliedto determine the influence of concentration temperature, height of liquid ring, and time of broadcasting ultrasonic waves to the synthesis point of concentrated product quality, concentration and recrystallization time,and specific cost of electricity.The results of the experiments showedthatthe equivalent ofconcentration temperaturebetween35Cand53C, increasing the height of liquid ringfrom 380mm to 680mm and time of broadcasting ultrasonic waves from 15to 30 minwill bemore effective than increasing theconcentration temperature in terms of reducing quality due to heat effect, the concentration-time and specific cost of electricity.

• Effects of adding chicken egg yolk and caffeine in extender on the quality of goat semen

  Ngo Thanh Trung, Tran Thi Chi, Vu Hai Yen, Nguyen Tuan Dung, Trinh Thi Linh Chi, Su Thanh Long

  Received: 25-05-2020 / Accepted: 12-09-2020

   Abstract PDF (VIETNAMESE)

  The aims of this study were to assess the effects of adding chicken egg yolk and caffeine in TCG (Tris-Citrate-Glucose) extender on the quality of goat semen preserved some goat breeds in Vietnam. Semen samples of 9 bucks belonging to 3 goat breeds, including Saanen, Boer and Alpine, (3 bucks/breed) were collected using artificial vagina, then diluted at a ratio of 1:10 with TCG extender added 0%, 5%, 10%, 15%, and 20% chicken egg yolk and 0,02; 0,03 and 0,04g caffeine/l. The diluted semen samples were preserved at 5 and 15C, respectively. The sperm motility and sperm morphological parameters of the preserved semen samples were assessed and compared after 24h, 72h, and 120h of preservation. Results showed that addition of 0,03g caffeine/l in TCG extender gave a better quality of preserved goat semen at both temperatures. At 5C, TCG extender added 10% of chicken egg yolk gave a better quality of preserved goat semen and could be used for artificial insemination after 72h of preservation. At 15C, TCG extender added 15% of chicken egg yolk resulted in a better quality of preserved goat semen and could be used for artificial insemination after 24h of preservation.

• Isolation and Characterization of Escherichia coli in of Bau and Dom Ducks at Dai Xuyen Duck Breeding and Research Center

  Nguyen Ba Tiep, Dang Thi Vui

  Received: 24-05-2016 / Accepted: 28-12-2016

   Abstract PDF (VIETNAMESE)

  The aim of the present study was to isolate and characterize Escherichia coli(E. coli) from Bau and Domconservation ducks at Dai Xuyen duck breeding and research center. The results showed that ages and breeds of ducks affected isolation rates. The breed differences in composition of serotypes O were observed. Two common serotypes O2 and O78 were not detected in this study. The bacterium bacterialisolates were resistaent to β-lactam, aminoglycoside, and diaminopyrimidine antibiotics. Especially, all of the isolates were resistant to lincomycin. Most of the isolates showed toxicity in Swiss albino mice. To the best of our knowledge, tThis is the first study on E. coliin Bau and Dom duck breeds. The results can be considered as groundwork ofor further studies on E. coliand other microorganisms infecting conservation breeding flocks.

• Evaluating Economic Efficiency of Coffee Production Based on Water Saving Techniques in Central Highland: A Case Study in Cu M’gar District, DakLak Province

  Nguyen Phuong Le, Nguyen Hai Duong

  Received: 19-03-2020 / Accepted: 06-06-2020

   Abstract PDF (VIETNAMESE)

  Drought and conventional irrigation methods are considered as reasons that make coffee growers face with water shortage more frequent and increasingly serious level in the Central Highlands. Applying water-saving technologies in coffee production has become an urgent need than ever. This study aimsto make an overviewthe types of coffee irrigation technologies being used; assess the economic efficiency of coffee production using economical irrigation technology and identify factors that hinder the application of economical irrigation technology for coffee in Cu M’gar district. Data which have been collected from 33 coffee producing households applying the irrigation technology (overall survey) and 30 coffee producing households using traditional irrigation technology (random sampling) in the study area showedthat water-saving techniqueshave brought higher economic efficiency compared toconventional ones. However, the households who have applied water-saving techniquesin the district are still very low, mainly due to the lack of investment capital, limited awareness of the producers and ineffective transferring activities.

• Reproductive Capacity of Ri Chicken and Crossbred Chicken Raised in An DuongDistrict, Hai Phong City

  Nguyen Ba Mui, Pham Kim Dang

  Received: 20-04-2015 / Accepted: 17-03-2016

   Abstract PDF (VIETNAMESE)

  A study was carried out at 3 households of An Duong district, Hai Phong city to evalue reproductive capacity of Ri and crossbred chicken (Ri-Sasso-Luong Phuong) (RSL). Results showed that the rate of survival of Ri and RSL chicken were highand they were well adapted tolocal conditions. Body weight of crossbred chicken was higher than Ri chicken at 01 day, 8 and 19 weeks of age.Reproductive maturity age of crossbred chicken (145 days) was later than Ri chicken (131 days).Reproductive peak of crossbred chickenwas at 30 weeks of ageas compared with 26 weeks forRi chicken.Theegg quality parameters of Ri and crossbredchickensmet specified standards andhatchabilityand chick quality were similar.

• Hydrostatic Power Split Transmission Test Band for Agricultural Tractor

  Pham Duy Suy, Han Trung Dung, Minh Hoang, Bui Hai Trieu

  Received: 20-03-2020 / Accepted: 12-05-2020

   Abstract PDF (VIETNAMESE)

  Due to the advantages of continuously variable transmission and high efficiency, hydrostatic power-split transmission (HPST) shows the applicability on the agricultural tractor. This is also shown in some theoretical research results. However, practical tests are needed to evaluate the power-split transmission configuration for the operating principle and dynamics properties for the next design goal. This article introduces the experimental model (test band) of a HPST built at the Department of Dynamics, Vietnam National University of Agriculture. The test band consists of a drive motor, a HPST, load generator and modern data processing and measuring equipment. The model can be used to reproduce the operating principle and to study the static and dynamic properties of the HPST, as the basis for control strategies in working conditions of agricultural tractors.

• Vietnamese Consumers’ Awareness of Organic Foods: A Case Study in Hanoi City

  Ngo Minh Hai, Vu Quynh Hoa

  Received: 02-07-2016 / Accepted: 22-09-2016

   Abstract PDF (VIETNAMESE)

  Expanding the market share of organic foods faces many difficulties in developing countries like Vietnam. One of the most important reasons is inadequate perception of organic foods due to limited information. The study examined Vietnamese consumers’ perception, and identified factors affecting the awareness of organic foods in the country. We interviewed 203 consumers randomly chosen at big supermarkets in Hanoi city. Through using descriptive statistics and applying ordered logit model, our study showed that only about 10% of the consumers had adequate awareness of organic food, while a half only heard of it but did not understand about organic term. Forty percent of remaining people have never heard of organic foods. Specific factors affecting the Vietnamese consumers’’ perception of organic foodare the product origin/label, food safetyevaluation and consumers’, education, age and occupatio.

• Life Cycle and Intrinsic Rate of Natural Increase ofthe Predatory Mite Neoseiulus longispinosusEvans (Acari: Phytoseiidae) Rearing on Different Foods

  Luong Thi Huyen, Nguyen Thu Thuan, Nguyen Thi Tuyet Nhung, CaoVan Chi, Nguyen Van Dinh

  Received: 08-03-2016 / Accepted: 07-10-2016

   Abstract PDF (VIETNAMESE)

  The experiment on influences of different foods on the life cycle and the intrinsic rates of natural increase of the predatory mite Neoseiulus longispinosusEvans was conducted at the laboratory of the Center for Citrus Research and Development, Chuong My district, Hanoi city. The natural foods were sixcommon phytophagous mite species on bean,teaand citruses. They weretwo spotted spider mite,Tetranychus urticae;carmine spider mite,Tetranychuscinnabarinus;red spider mite on tea,Oligonychus coffeae;Citrus spider mite,Panonychus citri;Scarlet mite Brevipalpus sp.,and citrus rust mite,Phyllocoptruta oleivora. The factitiousfoods were twostored product mites: Carpoglyphus lactisand Tyrophagus putrescentiaeand pollen of Typha latifolia.The results showed that, at 27.5±1oC, 80±5% RH, the predatory mite N. longispinosusdeveloped well on thenatural foods, meanwhile the life cycle of the predatory mite was not completed on twostored product mites species and on the pollen, they only developed to the protonymphstage. The life cycle of the predatory mite N. longispinosusrearing on T. urticae, T. cinnabarinus, P. citri, O. coffeae, Brevipalpus sp., and P.oleivora was 6.65 days, 6.56 days, 6,59 days, 7.41 days,. 7.47 daysand 7.26 days, respectively. Correspondingly, the intrinsic rate of natural increase (rm) of the predatory mite was0.2997, 0.2966 and 0.2980 when reared on T. urticae,T. cinnabarinusandP. citri, respectively, significantly higher than rearing on O. coffeae(0.244), Brevipalpus sp.(0.199)and P. oleivora(0.239).

• The Effect of The Expanded Clay Cultures and Slow Released Fertilizers on Growth, Development and Fresh Leaf Biomass of Mentha arvensisL.

  Nguyen Viet Long, Nguyen The Hung, Nguyen Van Loc, Doan Thi Yen, Truong Thi Hai, Duong Thi Hong Sinh, Souksakhone Phetthavongsy

  Received: 22-12-2015 / Accepted: 17-08-2016

   Abstract PDF (VIETNAMESE)

  The experiment studied the effect of the expanded clay cultures and slow released fertilizers on growth, development and fresh leaf biomass of Mentha arvensisL. The experiment consisted of two factors: the main factor is 4 expanded clay cultures: G1, G2, G3, G4; Sub-factor is 3 slow released fertilizers: P1, P2, P3. The 12 experimental treatments were arranged in randomized complete block (RCB) and repeated 3 times in the net house of the Faculty of Agronomy, VNUA, in Winter 2014 and Spring 2015. The studied results show that the expanded clay cultures made in Vietnam have porous properties, capacity to store water and nutrients helping plants grow and development better and therefore higher yields compared to the plants grown on the Chinese cultures. The expanded clay culture G1 and slow released fertilizer P1 (NPK ratio is 20:20:15) is the most appropriate substrate for Mentha arvensisL. to grow. Winter crop is suitable for mint basil plant growth, development and obtained higher yields (1.2 to 1.6 times) than spring season.

• The Effect of Live Food on Larvalof Malabar Grouper (Epinephelus malabaricus) in Early-Stage Age

  Hoang Nhat Son, Pham Cong Hai, Kim Van Van

  Received: 06-03-2020 / Accepted: 13-04-2020

   Abstract PDF (VIETNAMESE)

  This study aimed to determine the types and densities of live foods that affect the growth and survival of grouper larvae (Epinephelus malabaricus) from 0 to 12 days old. In the first experiment, the feeding regime consisted of four types of live feeds (three rotifer strains: Proales similis, Brachionus rotundiformis, Brachionus plicatilisand the trochophore of Pacific oyster) for larval nursing. The results showed that super small rotifers (Proales similis) (size 50-60µm) were most suitable for larval rearing of grouper to 12 days old. In experiment 2, the densities of rotifer (P. similis) at 10 individuals/ml and 15 individuals/ml were showed the best results in nursing of larval grouper, denoted as the survival rate of 12-day-old larvae was 8.3-11.7%; the population’s subdivision coefficients and the average length of grouper larvae were 4.4-8.8% and 601.8-603.6μm, respectively.

• Afforestation Linkage Model with FSC Standards in Tuyen QuangProvince

  Do Hai Yen, Nguyen Tuan Son

  Received: 25-09-2019 / Accepted: 15-11-2019

   Abstract PDF (VIETNAMESE)

  The present study wasaimed at investigating the current statusof afforestation linkage model with the Forest Stewardship Council (FSC)standards in Tuyen Quang province. Systematic and participatory approach methods were used. Basedon a survey of 120 forest plantinghouseholds, the study revealedthat additional income of households who participated in the linkage model and were able to sell FSC certified timber was 10-15% higher than non-participating households. Although many benefits from FSC afforestation linkage model, the forest area with FSC of households in Tuyen Quang provincewere attained, the afforestation was still in smallscaleand farmers still did not actively participate in the model. The study therefore recommended feasible solutions in order to develop afforestation linkage model with FSC standards in Tuyen Quang province such as enhancing the household’s awareness about benefits of model; establishing an effective permanent linkage structure between wood processing companies and farmers; local governments should play a role in the linkage by supporting and connecting between the two parties.

• Study on Biological Characteristics of Onychostoma laticepsGunther, 1896

  Vo Van Binh, Nguyen Hai Son, Nguyen Quang Huy

  Received: 13-05-2019 / Accepted: 17-07-2019

   Abstract PDF (VIETNAMESE)

  In order to maintain, protect and develop the gene source of Onychostoma laticeps, the study of biological characteristics of O. laticepswas carried out from January 2018 to December 2018 on 300 samples of O. laticepscollected in the Giang River, Mon Son commune, Con Cuong district, Nghe An province. Results showed that all collected fish samples were in the age of ranging from 1+-3+, corresponding to the weight of 22.5-98.8 g/fish. The O. laticepsis an omnivorous species (Li/Lo was 3.08 ± 0.57). The food composition in the fish intestines was diverse, including more than 28 species, representing for 5 different animal and plant sectors, of which the algae sector was dominated (65%) compared to other sectors. There were no much differences between the Fulton fat coefficient and Clark fat coefficient, this was reflected correctly the level of the nutrient that was accumulated in fish. In nature, O. laticepsstarted breeding in early February, the average absolute fertility was 3,113 eggs, the average relative fertility was 231 eggs/g of the female. The gonosomatic index (GSI) was high during the period from February to June (Male fish ranged from 1.81 to 2.12%; Females fish from 4.62-9.80%) and reached the highest value in March (Male fish: 2.64%; Female fish: 9.80%).

• Study on Establishment of Hybrid Cell Lines Secreting Monoclonal Antibody for Progesterone

  Nguyen Thi Hai, Le Van Phan, Nguyen Ba Mui, Nguyen Hoang Thinh, Nguyen Thi Phuong Giang, Tran Hiep, Cu Thi Thien Thu, Pham Kim Dang

  Received: 03-08-2019 / Accepted: 30-09-2019

   Abstract PDF (VIETNAMESE)

  Progesterone is a hormone that relates closely to the reproductive physiology of animals. The progesterone levelsin blood, urine and milk havebeen used to determine pregnancy in cows. In order to detecttheappearance ofprogesterone using specific tests, onemust create hybrid cellsthat secrete monoclonal antibody for this hormone, as one of the most important factors. The methodsof immunization, collection of spleen cellsof BALB/c mice, production of hybrid cell lines and ELISA had been applied. Basedon the use of different types of antigens, mice differently responded to selective progesterone antigens with the concentration of 200 µg/mLper mouse. The highest successful hybridization rate was 91.67%. The study created 5 hybrid cell lines (E4, E3, C6, H3, F10)secreting monoclonal antibodies forprogesterone antigen, 3hybrid cell lines(C12, D7, F11)secreting monoclonal antibodies for progesterone BSAantigenand 3hybrid cell lines(G5, H3, A7)secreting monoclonal antibodies for progesterone-3-CMO: BSA antigen.

• Study on Micropropagation of Cardamom(Amomum aromaticumRoxb.)

  Nguyẽn Thanh Hải , Nguyen Thi Dinh, Nguyen Thi Thom, Nguyen Thi Ngoc Han, Nguyen Thi Lam Hai, Dinh Truong Son, Dang Thi Thanh Tam, Nguyen Thi Thuy Linh, Pham Thi Thu Hang

  Received: 05-10-2018 / Accepted: 23-10-2019

   Abstract PDF (VIETNAMESE)

  Cardamom (Amomum aromaticumRoxb.) is one of the precious medicinal herbs. It also has been used as a spice in food processing. The aim of this study was to establish a protocol for in vitropropagation of Amomum aromaticumRoxb. fromrhizome buds, producing materials for mass-scale production as well as conservation.The most suitable time to collect rhizome buds of Amomum aromaticumRoxb. samples for in vitropropagation was from April to June. The rhizome budswere best sterilized with 0.1% HgCl2in 8 minutes. The highest shoot multiplication rate (4.13 shoot/explant; length of shoots 5.4 cm) was obtained on MS medium supplemented with 1.0 mg/L BAP after 6 weeks of culture. 100% of the shoots produced roots within 8 weeks on MS medium containing 0.5mg/L IBA.

• Disease Risk Management in ShrimpFarmingin the Coastal Areasof Nam DinhProvince

  Nguyen Thi Minh Thu, Tran Dinh Thao

  Received: 09-07-2019 / Accepted: 05-08-2019

   Abstract PDF (VIETNAMESE)

  The study aims at analyzing the situation to recommend measures to improve disease risk management in shrimp farming in Nam Dinh province. The study was conducted in three coastal districts, including Giao Thuy, Hai Hau and Nghia Hung. The data was collected through surveys with 120 shrimp farming households and note taking records in 910 shrimp pondsto analyze the disease’s likelihood, damages and households’ risk management strategies. In Nam Dinh, within 2010 and 2016, the shrimp farming area reduced from 3.632 to 2.834 hectares, corresponding to 59.52 to 45.30% of the total aquaculture area in brackish water. Over 80% of total shrimp pondssuffered loss fromdiseaseswithin 2015 and 2016. The disease risk managementcoastal areas could be improvedthroughvarious measures, including efficiency improvement in the state management in aquacultureareaplanning, infrastructuresynchronization, capacity building for the shrimp farmers,quality controlof aquacultureinputs, financial market development, agricultural insurance, promotion of the production-consumptionlinkage, and formation of value chain for the shrimp productin coming years.

• A New Similarity Measure of Picture Fuzzy Sets and Its Application to Data Clustering

  Le Thi Dieu Thuy, Nguyen Huu Hai, Nguyen Van Hanh, Do Thi Hue

  Received: 08-07-2019 / Accepted: 26-08-2019

   Abstract PDF (VIETNAMESE)

  The Jaccard index is a statistic used for comparing the similarity and diversity of sample sets. In this paper, we proposeda new similarity measure for picture fuzzy sets based on the Jaccard index.We then comparedthe proposed similarity measure with some existing similarity measures and showedthat the new similarity measure overcomes the restrictions of the existing similarity measures. Finally, we used this new similarity measure forthe data clustering problem.

• Nguyen Van Lam, Thuy Huong Nguyen, Hong Anh Thi Nguyen

  Received: 16-11-2018 / Accepted: 06-04-2019

   Abstract PDF (VIETNAMESE)

  Ổi (Psidium guajavaL.) là một loại cây nhiệt đới, được sử dụng làm thực phẩm và thuốc để chữa một số bệnh. Nghiên cứu này nhằm đánh giá sự biến đổi về chỉ số sinh lý, hàm lượng phenolic và khả năng kháng oxy hóa trong quá trình chín của hai giống ổi, Đồng Du và Đại Loan. Quả ổi được thu hoạch ở bốn giai đoạn khác nhau, giá sinh lý, chuyển màu, chín và chín quá. Hàm lượng phenolic và hoạt tính kháng oxy hóa được xác định bằng phương pháp Folin-Ciocalteu và DPPH. Kết quả cho thấy trong quá trình chín, đường kính và trọng lượng của giống ổi Đông Du tăng đáng kể, trong khi các biến số này của giống Đại Loan không thay đổi đáng kể. Về chỉ số màu sắc, các giá trị L, a và b tăng lên, trong khi giá trị hue giảm ở cả hai giống trong quá trình chín của quả. Hàm lượng acid ascorbic tăng trong quá trình chín và không có sự khác biệt giữa hai giống. Hàm lượng phenolic và hoạt tính kháng oxy hóa giảm trong quá trình chín và hai chỉ số này cao hơn ở giống Đông Du so với giống Đại Loan. Hàm lượng phenolic và khả năng chống oxy hóa có mối tương quan chặt (P <0,001), cho thấy các hợp chất phenolic là chất kháng oxy hóa chính trong ổi. Giai đoạn chín là thời điểm thích hợp để thu hoạch trái cây để tiêu thụ để. Thời gian thu hoạch phù hợp là rất quan trọng để sản xuất các sản phẩm ổi chất lượng cao như nước ép ổi và mứt.

• Le Thi Thu Huong, Ngo Thi Thuong, Nguyen Ngoc Kien, Tran Thanh Hai

  Received: 27-11-2024 / Accepted: 27-03-2019 / Published: 29-05-2024

  PDF (VIETNAMESE)

  DOI: https://doi.org/10.1234/8fy2pj73

• Molecular Characterization of Canine Parvovirus Type 2Isolated from Dogs in Hanoi

  Vo Van Hai, Nguyen Thi Yen, Dao Le Anh, Hoang Minh, Bui Tran Anh Dao, Bui Thi To Nga, Nguyen Thi Lan, Le Van Phan

  Received: 27-08-2018 / Accepted: 10-05-2019

   Abstract PDF (VIETNAMESE)

  Canine Parvovirus type 2 (CPV-2) has caused a highly contagious and fatal disease characterized by vomiting and hemorrhagic gastroenteritis in dogs of all age.In this study, four diarrheal stool samples collected from Parvovirus-infected dogs were used for VP2 gene sequencing. The results of VP2 gene sequencing and analysis of present CPV strains showed high nucleotide (nt) and amino acid (aa) identities when compared with those of other reference worldwide strains, sharing 98.4 - 100% nt and 97.7 - 100% aa. The results of the phylogenetic tree showed that the Parvovirus type 2 in this study was genetically classified into two distinct groups of Feline Panleukopenia Virus (FPV) and CPV. Three strains VNUA-CP31, VNUA-CP32 and VNUA-CP35 belonged to the branch of FPV and close to the FPV in China. Parvovirus type 2 VNUA-CP17 belongsto the branch of CPV and is close to Parvovirus vaccines of the Pfizer and South Korea.

• Determinants of Households’ Participation in ForestManagement, Protection and Development in Tra Vinh Province

  Diep Thanh Tung, Phan Thi Thanh Nhan

  Received: 12-10-2018 / Accepted: 09-03-2019

   Abstract PDF (VIETNAMESE)

  The objective of the study was to assess the factors affecting the level of households’participation in forest management, protection and developmentand topropose policy implications forforestmanagement, protection and development in Tra Vinh province. The data used in the study were collected from a questionnaire survey with a total of 191 householdsand analyzed usingthe multiple regression model (OLS) to determine the factors influencing the levelof households’participation forest management, protection and development. Results showedthat positivefactors influencing households’participation wereawareness, income from forest and non-timber forest products, distance from forest to the Commune People's Committee (or commune market), creditaccess, duration of forest protection contract, female household headand ownership of land use right certificate.On the other hand,three variables with negative relationship with the level of households’ participation includedexperiencein aquaculture production,forest management by the contract and income from fishery exploitationin the forest.

• Present Land Use and Orientation of Agricultural Land Use in the Process of Industrialization and Urbanization in BacNinh Province

  Nguyen Xuan Thanh, Do Nguyen Hai

  Received: 05-12-2018 / Accepted: 25-01-2019

   Abstract PDF (VIETNAMESE)

  Bac Ninh is an industrially developed province and plans to become a city under the central government after 2020, so that the agricultural land has been decreasinggradually. The research objectives were to evaluate the present agricultural land resource and to determine the suitable orientation of agricultural land use for industrialization and urbanization. Results showed that the present agricultural land was classified into 3 subzonesaccording to use: (1) subzone of pure agricultural production, (2) subzone of agricultural production affected by industrialization,and (3) subzone of agricultural production affected by urbanization. Results showed that there were 5 main land use types (LUTs) with 14 main land utilization typesin the province. Commodity oriented land utilization tovegetables, non-rice crops, fruits, rice and flower showedhigh economic efficiency in thesub-zones affected by industrialization and urbanization. The research results serve as basisto select suitableland useand land utilization for agricultural restructuringin order to meet the goalsof the socio-economic development in the process of industrialization and urbanization in BacNinh province.

• Awareness and Willingness-to-Pay for Clean Water Service in Thuy Nguyen District, Hai Phong City

  Nguyen Thi Thu Quynh, Nguyen Tat Thang, Bui Thi Khanh Hoa

  Received: 17-09-2018 / Accepted: 24-12-2018

   Abstract PDF (VIETNAMESE)

  The present study was conducted to examine the current supply and the awareness of the local people about the main characteristics of clean water services. Results showed that most local people were still unaware of the importance of clean tap water, thus they did not consider it the main source of their domestic water with 60% of households still using less than 10 m3of water monthly. Estimation from Probit equation based on CVM showed that the average households’ willingness to pay for clean water cost was VND 141.07 VND per month, which was higher than the current pay of VND 112.3 thousand per month. Analyzing influencing factors pointed out that the awareness of the people about the nescessity of clean water and the existing water sources had significant impacts on household’s willingness to pay. It is therefore suggested that governmenal agencies and providers should promote public awareness and willingness to pay for clean water services, contributing to the sustainability of the rural clean water system in the area in the coming time.

• Production and Characterization of Lignin Peroxidase from White Rot Fungal Strain Tl4

  Trinh Thi Thu Thuy, Nguyen Quoc Trung, Tong Van Hai, Nguyen Hoang Anh

  Received: 29-12-2016 / Accepted: 12-11-2018

   Abstract PDF (VIETNAMESE)

  Lignin is a component of plant cell wall. The degradation of lignin remains a challenge to date due to its stability. Lignin peroxidase (LiP) from white rot fungi was known as a highly effective oxidase enzyme for lignin degradation. In this study, extracellular LiP obtained from strain TL4 was precipitated by (NH4)2SO4and ethanol 96% for obtaining technical enzyme and then characterized for optimal temperature and pH and thermal and pH stability. Results indicated that the optimal temperature and pH of LiP were 30C and 4.0, respectively. This enzyme was stable between 20 and 30C for 2 hours (relative activities remain 94.17% and 89.10%, respectively) and pH from 2.0 to 4.0 for 3 hours (relative activities remain 78.97% and 97.87%), respectively. The LiP from strain TL4 showed potential application in environmental treatment and pre-treatment of cropby-products.