Residual Organic Compound Removal from Aqueous Solution Using Commercial Coconut Shell Activated Carbon Modified by a Mixture of Seven Metal Salts     

Huu Tap Van  Thi Thu Phuong Bui  Lan Huong Nguyen 《Water, air, and soil pollution》2018,229(9):292

The modified activated carbon (MAC) derived from commercial coconut shell activated carbon (AC) with mixture of seven metal salts was used as an adsorbent to remove target residual organic compound (sucrose) from aqueous solutions in batch modes. The results indicated that the highest adsorption capacity of sucrose onto MAC reached when the AC was modified at the ratio of impregnation of AC with mixture of seven metal salts, including nitrate silver (AgNO₃), manganese nitrate (Mn (NO₃)₂), potassium bichromate (K₂Cr₂O₇), nitrate cobalt (Co (NO₃)₂·6H₂O), nitrate copper (Cu (NO₃)₂·3H₂O), nitrate nickel (Ni (NO₃)₂·6H₂O) and nitrate iron (Fe (NO₃)₂·9H₂O) of 3% (w/w). The most appropriate conditions for sucrose adsorption onto MAC in batch experiments obtained at pH 7, contact time of 120 min, 800 mg MAC/50 mL of sucrose solution with initial concentration of 1500 mg/L. At this condition, the highest adsorption capacity of sucrose onto MAC reached 28.28 mg/g. The Langmuir, Freundlich, and Sips adsorption isothermal equilibrium models can adequately describe the adsorption properties of sucrose on MAC. The adsorption kinetic of sucrose onto MAC obeyed pseudo-first-order and pseudo-second-order models with the chemical sorption process. The saturated MAC was recovered by heat from an oven. The highest recovery efficiency of saturated MAC obtained at 180 °C in 120 min. The highest adsorption capacity of sucrose onto recovered MAC was 24.31 mg/g, appropriately adsorption capacity of initial MAC.  相似文献   

Spatial prediction of saline and sodic soils in rice‒shrimp farming land by using integrated artificial neural network/regression model and kriging     

Quang Toan Dinh  Dongli Liang  Tran Thi Anh Thu  Trong Dieu Hien Le  Nguyen Dinh Vuong  Van Tat Pham 《Archives of Agronomy and Soil Science》2018,64(3):371-383

In the context of widespread saline and sodic soil, mapping and monitoring spatial distribution of soil salinity and sodicity are important for utilization and management in agriculture lands. In this study, two-stage assessment was proposed to predict spatial distribution of saline and sodic soils. First, artificial neural network (ANN) and multiple linear regressions (MLR) model were used to predict sodium adsorption ratio (SAR) and exchangeable sodium percentage (ESP) based on soil electrical conductivity (EC) and pH. Then, the Kriging interpolation method combined with overlay mapping technique was used to perform saline spatial predictions in the study area. The model accuracy level is evaluated based on coefficient of determination (R²) and root mean square error (RMSE). In the first stage, the values of R² and RMSE of SAR and ESP were 0.94, 0.17 and 0.94, 0.24 for ANN, and 0.35, 0.52 and 0.34, 0.76 for MLR, respectively. Similarly, in the second stage, the RMSE of ANN-Kriging were much closer to 0 and relatively lower than MLR-Kriging and Kriging. The results show that ANN-Kriging can be used to improve the accuracy of mapping and monitoring spatial distribution of saline and sodic soil in areas that develop the rice-shrimp cultivation model.  相似文献   

Land Use After Forestland Allocation and the Potential for Farm Forestry in a Mountainous Region of Northeast Vietnam     

Thu Thuy Nguyen  Misa Masuda 《Small-Scale Forestry》2018,17(4):485-503

As a response to serious deforestation in Vietnam, the forestland allocation (FLA) policy was introduced in the 1990s. The process still continues, having allocated 80% of the forestland to various management entities, among which individual households are the most important one for production forests. While previous studies focusing on local livelihoods reveal negative impacts of the FLA, particularly in the initial stage, studies on forest cover change as well as government statistics indicate positive changes in the longer term. We focused on micro-scale land use change after the FLA, and selected two upland villages with different accessibility in the Northeast region of Vietnam. Though the FLA was initiated in 1995 in both villages, the government reforestation program first reached Village G with paved road, and they did second planting. However, forestland recipients in Village A, with no paved road, also planted timber species as soon as the program was introduced. Though the mean allocated areas in Village A was larger than that of Village G, the mean of tree plantation areas was comparable, 1.39 ha (SE?=?1.09) in Village A and 1.38 ha (SE?=?1.01) in Village G. These results suggest that government support is a determinant of the timing and area of tree planting activities. After the FLA, one of the next policy challenges is how to make small-scale farm forestry financially independent.  相似文献   

Colostrum quality,IgG absorption and daily weight gain of calves in small-scale dairy production systems in Southern Vietnam     

Bui Phan Thu Hang  Johan Dicksved  Kerstin Svennersten Sjaunja  Ewa Wredle 《Tropical animal health and production》2017,49(6):1143-1147

Dairy production is expanding rapidly in Vietnam, but still, the smallholder farms are most common. The aim of this study was therefore to get improved knowledge about colostrum quality in dairy cows, immunoglobulin G (IgG) absorption, daily weight gain in dairy calves and calf management in small-scale dairy production systems in Southern Vietnam. A field survey was conducted on 40 farms, with two calves on each farm being intensively studied. It was observed that newborn calves were separated from their dams immediately after birth and offered 2–4 L first colostrum within 4 h by bucket feeding. The first colostrum IgG level, fat and protein content were on average 35.6, 4.8 and 21.4%, respectively, and 91% of the cows produced colostrum of good quality (Brix value >22%). The IgG level in serum of calves, measured as Brix value, was on average 9.3%. Colostrum in the samples studied was of quite high quality and on-farm observations showed that colostrum was offered on the first day of calf life, so passive transfer of immunity to the calves was high. In total, 10% of the calves had a Brix value for IgG in serum lower than 8.3%, indicating that those calves had suffered from failure of passive immune transfer (FPT). The daily weight gain of female and male calves was 0.75 and 0.54 kg, respectively. Serum IgG was positively correlated with colostrum protein (P = 0.002). Daily weight gain and diarrhoea was negatively correlated (P = 0.001).  相似文献   

Marker-Assisted Selection of Xa21 Conferring Resistance to Bacterial Leaf Blight in indica Rice Cultivar LT2     

Hue Thi Nguyen  Quang Hong Vu  Tan Van Mai  Thu Thi Nguyen  Lam Duc Vu  Tung Thanh Nguyen  Long Viet Nguyen  Hien Thu Thi Vu  Hue Thi Nong  Trung Nguyen Dinh  Nakano Toshitsugu  Liet Van Vu 《水稻科学》2018,25(1):52-56

Bacterial leaf blight of rice (BLB), caused by Xanthomonas oryzae pv. oryzae, is one of the most destructive diseases in Asian rice fields. A high-quality rice variety, LT2, was used as the recipient parent. IRBB21, which carries the Xa21 gene, was used as the donor parent. The resistance gene Xa21 was introduced into LT2 by marker-assisted backcrossing. Three Xoo races were used to inoculate the improved lines following the clipping method. Eleven BC₃F₃ lines carrying Xa21 were obtained based on molecular markers and agronomic performance. The 11 lines were then inoculated with the three Xoo races. All the 11 improved lines showed better resistance to BLB than the recipient parent LT2. Based on the level of resistance to BLB and their agronomic performance, five lines (BC₃F₃ 5.1.5.1, BC₃F₃ 5.1.5.12, BC₃F₃ 8.5.6.44, BC₃F₃ 9.5.4.1 and BC₃F₃ 9.5.4.23) were selected as the most promising for commercial release. These improved lines could contribute to rice production in terms of food security.  相似文献   

Assessment of the climate-change impacts and evaluation of adaptation measures for paddy productivity in Quang Nam province,Vietnam     

Sangam Shrestha  Bui Thi Thu Trang 《Paddy and Water Environment》2015,13(3):241-253

  相似文献   

Folate and vitamin B12 status of women of reproductive age living in Hanoi City and Hai Duong Province of Vietnam     

Vu TT  Nguyen TL  Nguyen CK  Nguyen TD  Skeaff CM  Venn BJ  Walmsley T  George PM  McLean J  Brown MR  Green TJ 《Public health nutrition》2009,12(7):941-946

  相似文献   

Changes in fineroot growth dynamics in response to phosphorus application in an Acacia mangium plantation in Vietnam     

Thang  Nguyen Toan  Lam  Vu Tien  Son  Nguyen Huy  Van Do  Tran  Van Thuyet  Dang  Trung  Phung Dinh  Sam  Pham Dinh  Quy  Tran Hoang  Phuong  Nguyen Thi Thu  Huyen  Ly Thi Thanh  Thinh  Nguyen Huu  Van Tuan  Nguyen  Duc  Dao Trung  Ha  Dang Thi Hai  Trung  Duong Quang  Luong  Ho Trung  Anh  Nguyen Thi Hoai 《New Forests》2020,51(5):835-847

Fineroots (≤ 2 mm diameter) are dynamic components of the forest ecosystems and play important role in water and nutrient acquisition in forests. These roots are sensitive to forest fertilization and therefore, the response of fineroots to nutrient application would provide better understanding of the forest carbon and nutrient dynamics that will be helpful in sustainable forest management plans. Two fertilization treatments, including (1) F400: 400 g P₂O₅ (16.5%)/tree and (2) F600: 600 g P₂O₅ /tree, and F0: control (without fertilization), were applied in an Acacia mangium plantation with a planting density of 1100 trees/ha (3 m?×?3 m). The evaluation of fineroot growth across seasons showed that fertilization significantly increased production and subsequent mortality and decomposition. The total decomposition associated with F600 application was 7.95 tons ha^?1 year^?1, equaling 121% of F400 and 160% of the control. Mortality in F600 was 8.75 tons ha^?1 year^?1, equaling 111% of F400 and 198% of F0, while production in F600 was 10.40 tons ha^?1 year^?1, equaling 127% of F400 and 143% of F0. Fineroot production, mortality, and decomposition are seasonally dependent, with higher values measured in the rainy season than in the dry season. Stand basal area increment was significantly correlated with fineroot production (R²?=?0.75), mortality (R²?=?0.44), and decomposition (R²?=?0.48). This study showed that fertilization could facilitate fineroot production, which can then lead to a higher turnover of carbon and nutrients through the decomposition of the greater mass of the fineroots.

  相似文献   

Anthelmintic activity of milbemycin oxime against adult and immature Uncinaria stenocephala in dogs     

WL SHOOP  JR EGERTON  RL SEWARD  CH EARY  HW HAINES  BF MICHAEL 《Australian veterinary journal》1993,70(5):187-188

  相似文献   

Leukoencephalomalacia in horses     

RM CHRISTLEY  AP BEGG  DR HUTCHINS  DR HODGSON  WL BRYDEN 《Australian veterinary journal》1993,70(6):225-226

  相似文献