Search

Search Results

##search.searchResults.foundPlural##

Degradation of Hydrocarbon Components by Biofilm-forming Rhizobium sp. DG2 Isolated from Petroleum Storage Tankin Ducgiang, Hanoi

Le Thi Nhi Cong, Tran Thi Mai, Cung Thi Ngoc Mai, Do Thi Lien, Tran Thi Dao, Nguyen Huyen Anh

Received: 25-09-2023 / Accepted: 05-01-2024
The purpose of this investigation was to select biofilm-forming bacteria which can degrade or transform crude oil components leading to the solution of oil contamination causing by exploitation, transportation and use of oil and oil products. To gain this aim, several approaches such as enrichment to isolate and identify the bacteria that can utilize oil components and form biofilm and to assess oil degradation capacity of biofilm type in comparison with planktonic type of the strains. As results, the biofilm–forming Rhizobium sp. DG2 was isolated from oil contaminated sediment samples taken in petroleum storage in Ducgiang, Hanoi. The biofilm of this strain was capable of degrading 44.8; 76.0, 62.0, 73.0 and 75.0 % of diesel oil, anthracene, naphthalene, phenanthrene and pyrene, respectively, with the initial concentrations of 4.786 g/L for diesel oil and 200 ppm for the others. In contrast, the plantonik Rhizobium sp. DG2 in free form degraded only 35.4; 65.1; 54.5; 54.6 and 64.2 % of these components. The obtained results suggest the potential of using biofilm-forming bacteria in general and Rhizobium sp. in particular to treat oil pollution.
Morphological, Flowering and Fruiting Characteristics of some Accessions of Angelica acutilobaSieb. et Zucc Kitagawa Grown in Sapa Lao Cai

Ninh Thi Phip, Nguyen Huy Van, Nguyen Thi Thanh Hai, Dao Xuan Quang, Bui Thi Hong Anh, Nguyen Mai Thom

Received: 11-09-2023 / Accepted: 05-01-2024
Angelica acutiloba Sieb. et Zucc Kitagawa is a valuable medicinal plant for women that is widely used in traditional medicine. This plant was introduced to Vietnam, for growing in cool climates and propagated by seed. Research on flowering and fruiting characteristics of A. acutiloba Kitagawa contributes to developing varieties suitable for Vietnamese conditions. 5 accessions of A. acutiloba Kitagawa were collected in several provinces and planted in Sapa, Lao Cai from 2018 to 2020. The experiment was designed by RCBD with 3 replications. The results showed a flowering rate of 5-10% in the first year after sowing. In the second year, 589-600 days after planting, the flowering rate was about 90-95%. A. acutiloba Kitagawa bloomed in order of branch levels. The time from flowering to seed maturity for all accessions was about 2 months. The VT-ĐQ02 accession, collected in Sapa, had the lowest rate of flowering plants in the first year after sowing, high accumulation of dry matter in stem, leaves, and root, high seeding ability, and 1,000-seed weight reaching 4.1g. Individual and actual seed yields were 64.57 g/plant and 129.14 kg/ha, respectively.
Evaluating Properties of Mycelial Growth and Effect of the Wheat Bran Ratio on Formation and Fruiting Body Development of Golden Lingzhi Mushroom Strain(Tomophagus cattenensis)

Nguyen Thi Huyen Trang, Ngo Xuan Nghien, Tran Dong Anh, Nguyen Thi Luyen, Nguyen Thi Bich Thuy

Received: 15-08-2023 / Accepted: 25-12-2023
The golden lingzhi strain Toc1 (Tomophagus cattienensis)is a new strain that was discovered in the Cat Tien National Park in Đong Nai provine and it was identified to be a precious mushroom species. In this study, mycelial of strain Toc1 were incubated in 4 temperature levels (20 ± 1C, 25 ± 1C, 30 ± 1Cand 35 ± 1C); culture medium supplemented 5 different carbon sources (glucose, fructose, saccharose, maltose and lactose), 5 different nitrogen sources (yeast extract, peptone, ammonium clorua, ammonium nitrate and ammonium sulfate), 6 mineral salt sources (kali cloride, kali nitrate, natri nitrate, dikali phosphat, kali dihydrophosphat and magie sulfate). Beside that, mycelial of this strain were cultivated in 4 substrates added different wheat bran ratio (0%, 5%, 10% and15%). This study aims to figue out the optimal temperature, the suitable carbon, nitrogen and mineral salt source for mycelial growth of golden lingzhi mushroom strain Toc1 and also evaluating effect of the wheat bran ratio, which was supplemented on substrate, on formation and fruiting body development of this strain. The results showed that the optimal temperature for mycelial growth is 25C±1. Glucose and yeast extract were considered the most suitable carbon and nitrogen sources for mycelial growth. This strain grew very well on culture supplemented K2HPO4. The substrate containing 89% sawdust, 5% corn powder, 1% CaCO3and 5% wheat bran performed the highest BE, reached 15,97%.
Evaluation of Effects of Herbal Product PremixHad and Doxycycline on Feed Conversion Ratio and Small Intestinal Villus Measurements in Swiss albino Mice

Hoang Trung Hung, Vu Van Cuong, Nguyen Thi Minh Phuong, Do Van Hieu, Phuong Thien Thuong, Nguyen Duc Hung, Nguyen Ba Tiep

Received: 28-03-2023 / Accepted: 04-08-2023
Thí study aims to evaluate the effectiveness of herbal product PremixHad and doxycycline on feed intakes, feed conversion ratios and villus measurements of small intestine in Swiss albino mice via growth parameters and micro-morphological measurements. The results showed that PremixHad supplement in feed with concentrations of 1.25%; 2.5%; 5.0% and doxycycline (2g per liter of drinking water) were safe for the mice. Supplement concentation at 1.25% improved BW gain. PH and doxycycline increased feed efficiency via the decrease of FCR. PH showed good effects on height, width and height/width ratios of duodenal and jejunal villi but no effect on ileal villus sizes. Meanwhile, doxycycline decreased these parameters in the mouse illeum. It can be said that PH is safe with positive effects on the intestinal health of Swiss albino mice and should be tested in livestock animals to confirm the effectiveness.
Isolation, Screening and Identification of Yeast Strain for Producing a High Quality Fermented Watermelon (Citrullus lanatus)Juice

Do Thi Bich Thuy, Tran Thanh Quynh Anh

Received: 19-09-2022 / Accepted: 02-03-2023
This research was conducted to isolate, screen and identifyyeast strain capable ofproducing high quality fermented watermelon juice. The strain Saccharomyces cerevisiae M11 was selected basedon the content of alcohol, aldehyde, phenolic total, anthocynine, and antioxidant capacity in fermented watermelon juice and identified by sequencing region of ITS (Internal Transcribed Spacer Regions). The results showed that the strain M11produced highest content of alcohol (11.6 ± 0.1), phenolic total (0.06mg GAE/ml), anthocynine (0.589 ± 0.012 mg/l), and antioxidant capacity (0.589 ± 0.012 mg/l) while theanother strains (M2, M7 and M14)producedlowest content of aldehyde (57.7 ± 2.68 mg/lethanol 100)in fermented product.
Effect of Slaughtering Age on Nutritional Composition and SensoryQuality of Tien Yen Chicken Meat

Vu Quynh Huong, Nguyen Vinh Hoang, Nguyen Thi Nga, Nguyen Van Duy

Received: 09-08-2022 / Accepted: 27-01-2023
This study aimed to determine the nutritional, physicochemical,and organoleptic composition of Tien Yen’s caponsand layinghensatdifferent slaughtering ages. Caponswere evaluated at 6.5, 7, and 7.5 monthsof age. Hens were evaluated at 5, 5.5, and 6 months of age. The results indicated that the protein content of the meat did not change while the lipid and cholesterol content raised with the increasein chicken slaughter age. The cholesterol levelof capons at 7 and 7.5 months was 1.5 and 1.7 times higher than at 6.5 months, respectively. Similarly, the cholesterollevelof hens at 6 months of age was 1.3 times higher than at slaughter at 5 months. The physicochemical parameters of Tien Yen chicken such as toughness, color, rate of waterloss after storage and loss rate after processing did not show significant differences between slaughter ages, but earlier slaughter age had pH24 values higher than that of later slaughter age. The organoleptic quality of chicken meat was the same across the slaughter ages.Thus, slaughtertimeat 6.5 months of age for caponsand at 5 months of age for hens helps to reduce lipid and cholesterol levels in commercial Tien Yen chicken.
Multi-label Classification and its Application for Vietnamese SMS classification

Hoang Thi Ha, Dao Xuan Duong, Le Thi Nhung

Received: 24-02-2022 / Accepted: 20-12-2022
Today, most of the users of mobile devices are regularly bothered by a large number of scam messages, advertising messages in different fields such as entertainment, shopping, finance, and real estate. Among these, each SMS message can belong to one or more different message types at the same time. Therefore, using single-label classification methods to classify messages would be inappropriate. In this study, we have summarized multi-label classification techniques, collected a dataset of 2,000 Vietnamese SMS messages (SMSVN), and improved the accuracy of the methods for multi-label classification by using the preprocessing techniques to normalize and clean data. Moreover, we have also applied the well-known multiple classifiers to test classification on this dataset. The results show that, after applying the preprocessing techniques, most of the multi-label classification techniques had higher accuracy and lower classification error. The Classifier Chains technique using Naïve Bayes model was suitable for the Vietnamese SMS data classification issues.
Effects of some Fermentation Conditions of Aspergillus oryzae T6 on the Biosynthesis of -Glucosidase inhibitors in the Production of Health Foods for People with High Blood Glucose and Overweight

Nguyen Duc Tien, Nguyen Thi Huyen

Received: 05-10-2022 / Accepted: 20-12-2022
This study evaluated the influence of some fermentation conditions on the biosynthesis of α-glucosidase inhibitors (AGIs) of AspergillusoryzaeT6 (A. oryzae T6) cultured on semi-solid medium from black beans in the production of health-protective foods for people with high blood glucose and overweight. By determining the inhibitory activity of α-glucosidas the results showed that the biosynthesis of AGIs on semi-solid medium from black beans (Vigna cylindrica Skeels) gave the best effect in terms of the thickness of the fermentation medium block (24cm). The periodic agitation of the semi-solid medium from black beans during fermentation was every 12 hours; humidity of semi-solid medium from black beans for fermentation was 55% and fermentation time was 56 hours. The resulting AGIs products with IC50of 0.202 ± 0.006 mg/ml were applied to food production to help stabilize blood glucose in people with high blood sugar and overweight.
Prevalence of Bovine Coronavirus Causing Diarrhea in Cattle in Nghe An and Surrounding Provinces

Vu Thi Ngoc, Huynh Thi My Le, Le Van Phan, Mai Thi Ngan, Tran Thi Huong Giang, Nguyen Van Giap, Dang Huu Anh, Le Van Truong, Bui Thi Phuong Thao

Received: 21-03-2022 / Accepted: 27-05-2022
Bovine Rotavirusis considered a major cause of diarrhea in cattle, especially in calves.This study was carried out to find the prevalence of Bovine Rotaviruscausing diarrhea in calves in Nghe An and surrounding provinces. The detection of the virus using the RT-PCR method showed that 29/142 (20.42%) stool samples of diarrhea calves were positive for Bovine Rotavirus. The positive rate of Bovine Rotaviruswas the highest in the group of calves under 1-month-old (24.75%), followed by the calf group from 2to 3 months old (10.34%). The rate ofRotavirusinfection in calves over 3 months old was rather low,only 0.08%. The VP1 gene sequencing and analysis revealed that the BRV strains isolated in the present study belonged to the R2 group, the same as the US vaccine strain MVS-BRV1 isolated in the US in 1998.
Establishing Spatial Vibration Models of Frontloader Tractor

Pham Trong Phuoc, Dang Duc Thuan, Bui Viet Duc, Dang Tien Hoa, Nong Van Vin

Received: 16-12-2021 / Accepted: 05-04-2022
This article presented the spatial vibration model of a Frontloader Tractor (FLT), which is formed based on a universal wheeled tractor combined with a frontloader when traveling on the road roughness proﬁle. In the model, a method for determining the components of the moment of inertia of the wheel loader corresponding to different lifting positions was proposed. The results of solving the system of oscillating differential equations are an important premise to study the influence of the wheel loader on the motion stability, control features, and traction ability of the FLT, serving as a basis for perfecting the machine model.
Evaluation of theAgronomic Traits,Qualityand thePresence of Genes Linked to Anthocyaninof Newly Developed Black Rice Lines

Nguyen Thi Huong, Tran Thien Long, Le Van Huy, Nguyen Thi Kim Dung, Nguyen Quang Tin, Tran Manh Cuong, Tran Thi Huyen, Pham Van Thuyet, Tran Van Quang

Received: 26-08-2021 / Accepted: 21-01-2022
In Vietnam, black rice varieties are being used as functional food for the improvement of human health. Breeding and selection of black rice varieties with early maturity, high yield, good quality, high anthocyanin content and low susceptibility to pests are of necessity. The present experiments were conducted to evaluate agronomical characteristics, yield and quality of some newly developed black rice lines at Crop Research and Development Institute, Vietnam National University of Agriculture. The SSR molecular markers were used to identifyied genes controlling anthocyanin content in black rice lines. Out of 25 inbred lines, there are seven promising lines havwere been selected, viz.as C1, C12, C14, C18, C19, C21 and C25 with a desirable desiredgrowth duration of 109-117 days,yield of 6.15-8.05 tons ha-1in the summer season, head rice ratio in the range of 74-80%, and grain length of 6.4-6.7mm. Out of 7 promising lines, only one elite line C1 was been selected. The new black rice line C1 that carries markers of Kala1, Kala3, and Kala4genes has an amylose content of 3.88% and, anthocyanin content of 619 mg/100g on dry matter basis. This suggested that SSR markers of Kala1, Kala3and Kala4genescould be used for making decision for selection of black rice genotypes with high anthocyanin content.
Biological Characteristics of Rhodococcus sp. BPTC-316 Showing Degradationof Chlorpyrifos and Antifungal Activity

Nguyen Manh Tuan, Nguyen Thu Huong, Truong Phuc Hung, Nguyen Viet Hung, Do Bich Due, Do Thi Hien

Received: 08-06-2021 / Accepted: 21-01-2022
Research was performed to select soil bacteria showing degradation of chlorpyrifos and producing antifungal activities. Strain BPTC-316 had the highest biological activity among 32 potential isolates using selective medium, culture characteristics and 16S rRNA gene sequence analysis. The strain BPTC-316 showed the closest similarity of 99.78% to Rhodococcus tukisamuensisJCM 11308T(AB067734) based on analysis of 16S rRNA gene sequence. BPTC-316 was able to degrade 96.8% chlorpyrifos after 10 days of incubation. In addition, the crude bioactive compound extracted from strain BPTC-316 was able to inhibit growth of Fusarium oxysporumKACC 41083 and Phytophthora capsiciKACC 40483 with antifungal diameters of 17.6 and 16.8mm, respectively.
Impacts of Covid-19 Pandemic on Fisheries Management in Vietnam: An Initial Assessment from Fisheries Management Aspects

To Van Phuong
The Covid-19 pandemic with its complicated and unpredictable occurrence negatively affects socio-economic aspects, including fisheries sector. The present paper reports the initial assessment about the impacts of Covid-19 on Vietnam’s fisheries management activities. The secondary data were collected through online survey and discusions with fisheries managerial staffs from Provincial Departments of Fisheries. Above 77.4% of respondents were unanimously in answering that the Covid-19 pandemic had a heavy effect on fisheries management activities. Fishermen supported services, seafood processing plants and exporting were affected seriously with 48.4%, 74.2% and 71%, respectively. The frequency of fishing vessels’ arrivals and departures in ports decreased by 10-30% compared with previous years. Several technical workshops and training courses for fishermen were postponed, cancelled or shifted to next year because of social distancing, lockdown and movement and gathering restrictions in order to cope with Covid-19 pandemic.
Assessment of the Implementation of Land Financial Revenues in Vinh City, Nghe An Province

Pham Phuong Nam, Tran Viet Hoang

Received: 02-06-2021 / Accepted: 05-08-2021
The study aimed to point out the advantages, disadvantages and causes and, thereby, propose solutions to overcome the disadvantages when implementing financial revenues from land (FRL) in Vinh city. Secondary data were collected at Vinh City People's Committee. A total of 267 households and 99 civil servants related to FRL were surveyed. In the 2016-2020 period, total land revenue was VND3,125,967 million, accounting for 24.64% of total budget revenue, wherein the land use fee was VND2,596,237 million (83.05%) and the land rent was VND397 million (0.01%). The constraints were lack of operating human resources, lack of updated land database and linkage between all levels and sectors, limited information technology application, frequent occurrence of financial obligation violations, and high rates of tax and fee in land use right transfer. The solutions recommended include ensuring sufficient human resources, fully updated land database, ensuring communication among all levels and sectors, enhancing the application of information technology, promoting propaganda and dissemination of the law, violation sanction, and improving some financial revenues.
Factors Affecting the Cadre Quality of Socio-political Organizations: A Case Study in Nghia Dan District, Nghe An Province

Le Ngoc Huong

Received: 05-05-2021 / Accepted: 30-08-2021
Despite the limited quantity of full-time positions, cadres of socio-political organizations at district and commune levels are responsible for important duties in social management as well as production and business development. Thus, their quality needs to be improved to meet practical requirements. This study aimed to propose solutions to improve the quality of cadres of socio-political organizations in Nghia Dan district, Nghe An province and other districts with similar conditions. The main research methods used were descriptive statistics, comparative statistics and linear regression models. The research results showed that there were 6 factors which accounted for 79% of the change in the quality of cadres in socio-political organizations. The most significant influencing factors among these were professional qualifications, political-theory levels and the degree of regular training in professional and other fields relevant to their position and work. In order to improve the quality of cadres, it is necessary to implement various solutions such as improving their professional qualifications, political-theory levels, regular training and income improvement.
Determination of Residential Land Price using Regression Model in Nghi Tan Ward, Cua Lo Town, Nghe An Province

Pham Thi Ha, Nguyen Van Quan, Nguyen Van Trung

Received: 18-05-2021 / Accepted: 19-07-2021
The objective of this study is to build a regression model for application in determination of residential land price close to the market price. Determination of residential land price is an important tool to solve the problems of land price management, land financial management. Therefore, land management in general and land price management in particular, the determination of residential land price is always the top concern. This study used the method of land valuation using the regression model to determine the price of residential land in the study area; to help determine the land price close to the market price for an entire area or an area quickly and relatively accurately. 200 samples were collected in Nghi Tan ward, Cua Lo Town, Nghe An province to build a regression model of residential land price. From the regression model, a series of residential land prices were determined, thereby a map of land prices in market prices was constructed to serve the development of land price policies and the state management ofland prices.
The Efficiency of High-Tech Mango Production Models in Yen Chau District, Son La Province

Do Thi Nhai, Tran Nguyen Thanh

Received: 04-12-2020 / Accepted: 02-06-2021
This research aimed to evaluate the economic, social, and environmental efficiency of high-tech mango production models in Yen Chau district, Son Lan province. We applied the descriptive statistics, economic efficiency evaluating methods, and scoring technique to analyze those models' efficiency based on information from interviewing 60 households by a semi-structured questionnaire. The results showed that high-tech production models have brought higher efficiency in all aspects compared with the traditional cultivation techniques, especially, the model which applied multiple high-technologies attained the highest efficiency. On the economic side, high technologies' application increased farm's productivity, revenue, mixed-income and efficient capital. Meanwhile, in the social aspect, high-tech applications helped households enhance their production capability, created more job opportunities, and increased their income. As for environmental efficiency, high-tech production models minimized the used quantity of inputs such as pesticides, water, and electricity. Those models have also contributed to protecting the environment of soil.
Promoting High Technology Application for Agricultural Cooperatives: Theory and Practice

Le Thi Thanh Loan, Pham Bao Duong, Nguyen Thi Thiem

Received: 10-08-2020 / Accepted: 17-05-2021
Cooperatives play an important role in the national economy to help link and create motivation for small-scale farmer households. Application of high technology in agriculture is considered due to the benefits such as providing safe and high-yielding agricultural products, raising incomes, reducing impacts to the environment. Therefore, promoting the application of high technology in agricultural cooperatives is necessary. This study aimed to overview the theoretical and practical basis for promoting high-tech agricultural cooperatives. Thereby, some suggestions have been given to promote agricultural cooperatives to apply high technology include providing legal bases to help identify high technology agricultural cooperatives; speeding up the formulation and approval of high-tech agricultural projects in localities; flexibility in forms of a mortgage when borrowing capital; extending the limits on land holdings; raising awareness of producers and consumers on the role of high technology and paying attention to capacity building for the cooperative management board as well as fostering vocational skills for agricultural workers.
Effects of Postharvest Treatment by Propionic Acid in Combination with Wax Coating onQuality of Purple Passion Fruit (Passiflora edulisSims.)

Le Ha Hai, Nguyen Sang

Received: 05-04-2021 / Accepted: 04-06-2021
The research aimedto identify the concentration effects of propionic acid (AP) combined with a membrane coated with a mixture of beeswax and carnauba wax (MW) at a concentration of 8% on quality and storage time of postharvest purple passion fruit. After being washed and left to dry, the fruits were dipped in AP solution0.25; 0.35; and 0.45% for 10 minutes.After being left to dry again, the fruits were coated with 8% MW. After continuing to be left to dry, the fruits were placed in a foam tray put in carton boxes and stored at 5 ± 1°C, RH = 85 ± 2%. The untreated fruits and uncoated fruits were used as controls. The respiration rate, the percentage of weight loss, the total soluble solids (TSS) content, the total titrable acidity(TTA) and vitamin C content, the total microorganism population on the surface of the fruits and the percentage of fruits decay were analyzed and evaluated throughout the storage period. Research results showed that AP at a concentration of 0.45% combined with8% MW coating (CT3) is the best treatment for reducing the respiration rate, the total microorganism population on the surface of the fruits, the percentage of fruits decay and weight loss, slowly reduced TSS, TTA and vitamin C content. After 42 days in storage purple passion fruit treated by CT3 had the percentage of general loss including weight loss and decay is 11.9% in comparison with the control sample had the percentage of general loss is 96.2%.
Assessment of Probiotic Potential Characteristics Lactobacillus plantarumand Preliminary Application in the Production of Guava Juice

Nguyen Thi Lam Doan, Nguyen Thi Thanh Thuy

Received: 27-03-2021 / Accepted: 04-05-2021
Probiotic beverage products derived from plants are increasingly interested in research. Guava is a fruit with high fiber, vitamin C content and contains many active antioxidants that are good for health. Lactobacillus plantarumis a safe lactic acid bacterium, widely used in food fermentation. This study aimed to evaluate probiotic potential of Lactobacillus plantarumstrains. By measuring OD620nm, applying the agar punching method on the medium with the corresponding substrate supplementation, the diffusion on agar plates method. L. plantarumDH 7.12 was determined with good probiotic properties such as low stomach pH tolerance, bile salt tolerance, generate all 3 extracellular enzymes (amylase, protease, cellulase), antagonist to pathogensEcoliand Salmonella. When L. plantarumDH 7.12 was added into guava juice with cell concentration 108 CFU/ml. The product was assured of organoleptic quality and the remaining amount of probiotic bacteria reached 107 CFU/ml after 28 days of storage at a temperature 5 ± 1C
A Novel Regression Approach for wind Speed Forecasting

Nguyen Hoang Huy, Hoang Thi Thanh Giang

Received: 20-07-2020 / Accepted: 08-09-2020
The paper presents a spatio-temporal data forecasting approach using Linear Regression (LR) in two steps called two-step LR. In the first step, all features were divided into subgroups and Linear Regressions was utilized to obtain a regression value for each feature subgroup. In the second step, Linear Regressions was applied again to these regression values to generate the final regression value. The approach using two-step LR had state-of-the-art performance for a wind speed forecasting problem. Wind speed forecasting would be useful for the integration of wind energy into the power grid because wind power generated by wind turbines has an intimate relationship with wind speed and unpredictability and variability of wind speed is one of the fundamental difficulties of this integration system.
Influence of Single Nucleotide Polymorphism G/T at 5’-Splice Site of Intron 1 of WaxyGene on Amylose Content and Gel Consistency in Vietnamese Rice

Nguyen Quoc Trung, Luu Thi Van, Nguyen Chinh Viet, Tong Van Hai

Received: 10-06-2020 / Accepted: 21-01-2021
The cooking and eating quality of rice, which are defined by amylose content (AC) and gel consistency (GC), are important criteria determiningthe export price of Vietnamese rice. These properties mainly depend on the amylose content in rice grain endosperm and are regulated by the Waxygene. This study aimedto determine the effect of point mutation G/T in the first intron of Waxygene with AC and GT traits in Vietnamese rice accessions. The AC evaluation in 64 accessions resultedfrom26 accessions with high AC and 5 accessions with average AC; 20 accessions with low AC; 2 accessions had very low AC and 11 accessions of glutinous rice, respectively. The GC evaluation results classified the materials into 5 groupsincluding: very hard (25 accessions); hard (1 accession); medium (13 accessions); soft (11 accessions) and very soft (14 accessions). Using CAPS markers, there were 31 samples possessed SNP G and Wxaalleles and 33 samples possessed SNP T and Wxballeles. Comparison of genotypic and phenotypic results showed that the PCR-AccI has high accuracy for detection of Waxygenotype and needed to apply in breeding programs for quality rice.
Characterization of Fungal Strains Isolated from AlcoholicFermentation Starters of Nga Son, Thanh HoaProvince

Nguyen Huy Thuan, Le Thi Hanh, Tran Dang Khanh, Nguyen Van Giang

Received: 18-05-2020 / Accepted: 10-08-2020
This experiment was conducted to find the fungal strains with high saccharification activity isolated from the alcohol fermentation starters collected in Nga Son, Hau Locdistrict, Thanh Hoa province and growing well under normal conditions to increase the alcohol yield and decrease fermentation time in alcohol production. The contents of the study include the isolation of mold strains from traditional alcoholic fermentation starters, evaluation of amylase production, and saccharification of the isolated fungal strains using methods described by Xu-Cong & cs., (2012); Scheherazed & cs., (2016); Samson & Hoekstra(2002). Besides, the effects of cultural conditions on the saccharification of selected fungal strains were surveyed. Seventeen strains of fungi isolated from alcoholic fermentation starter samples produced amylase with activitiesfrom 2.0 to 4.5 U/ml. Among them, two mold strains NS1.1 and HL2 exhibited the highest saccharification when they grew on the block of sticky rice. The sugar content in the solution obtained from the fermented rice block of the NS 1.1 strain reached 7.02µM, 6.18µM with the HL2 strain. The appropriate temperature for the selected strains exhibited amylase activity ranging from 25C-35C, optimum at 30C. The comparative result of the 18S rRNA nucleotide sequence showed that the strain NS 1.1 has 99% similarity to the one of Rhizopus oryzea strain 150138 and was named Rhizopus oryzaestrain NS1.1.
Effects of some Intercropings with Maize on soil characters and maize yield planted on the Sandy Soil in Nghe An Province

Nguyen Thi Bich Thuy, Dao Chau Thu, Cao Viet Hung

Received: 25-02-2020 / Accepted: 31-12-2020
Drought and moisture deficiency in crop cultivation on the coastal sandy soil in Nghe An province have occurred frequently in the late spring crop. Mono-culture is a factor that influences increasing soil temperature and water evaporation and nutrient losses than intercropping. Therefore, the objective of this study was to assess the impact of intercropping maize on the temperature, humidity, nutrition, yield of maize on sandy soil in Nghe An province. The experiments were conducted in two seasons of 2015 and 2016 in a randomized complete block design (RCBD) with 5 formulas: KX (No intercropping), NL (Maize-Peanut), NĐ (Maize- Black Bean), NX (Maize-Green Bean), NK (Maize-Sweet Potato). The results showed that intercropping between maize and other crops significantly influenced temperature, humidity, soil nutrient and yield. Soil moisture content in intercropping plots was constantly higher, whereas soil temperature was lower than those in a single maize plot. Soil nutrient indicators tended to increase after the experiment and gave the highest value in the NĐ plot. The highest yield of maize in the formula NĐ was 4.962 ton/ha in spring crop 2015 and was 4.831 ton/ha in spring crop 2016, the remained intercropping plots were perpetually higher than the single maize plot (P0.05).
Factors Affecting Residential Land Prices in Vinh City, Nghe An Province

Tran Thai Yen, Nguyen Thanh Tra

Received: 22-10-2020 / Accepted: 11-12-2020
The study aimed to determine the impact of these factors on residential land prices in Vinh City and to propose some recommendations when determining residential land prices. Secondary data were collected from functional departments in Vinh city. The primary data were collected through surveys of 181 people related to the establishment and appraisal of residential land prices. The data were analyzed through Cronbach's Alpha coefficients, exploratory factor analysis and linear regression models by software SPSS 20.0 and Amos 24.0. There were 28 factors belonging to 9 groups of factors included in the regression model that had an impact on residential land prices with the impact rate from 4.43% to 17.23%, respectively. When determining residential land prices, it is necessary to pay attention to the impact of the groups of factors on residential land prices such as the relationship between supply and demand of land use rights; plot location; rate of urbanization and urbanization speed in the present and the future etc., to determine the appropriate price of residential land in each stage of the urbanization process and harmonize the interests of the State and land users and organizations related to land use rights in Vinh city, Nghe An province.

251 - 275 of 500 items << < 6 7 8 9 10 11 12 13 14 15 > >>

Search

Advanced filters

Search Results