Weed flora of water rice in the Red River Delta,Vietnam     

Nguyen Thi Tan  Nguyen Hong Son  Ha Minh Trung  Bruce A. Auld  Shane D. Hetherington 《国际虫害防治杂志》2013,59(4):285-287

The occurrence of weeds in water rice was surveyed in the Red River Delta, Vietnam during spring and summer rice-growing seasons in 1995 and 1996. Sixty different weeds from 19 plant families were recorded. The most important plant families as weeds of rice were Poaceae and Cyperaceae. The most important weed however was Rotala indica (Willd.) Koehne (Lythraceae) followed by Echinochloa crus-galli (L.) Beauv. and Cyperus difformis L. A brief comparison of this rice weed flora and those of Australia and California was made.  相似文献   

Lithospermum erythrorhizon Suppresses High-Fat Diet-Induced Obesity, and Acetylshikonin, a Main Compound of Lithospermum erythrorhizon, Inhibits Adipocyte Differentiation     

SY Gwon  JY Ahn  CH Chung  B Moon  TY Ha 《Journal of agricultural and food chemistry》2012,60(36):9089-9096

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Prospects of Marine Sterols against Pathobiology of Alzheimer’s Disease: Pharmacological Insights and Technological Advances     

Md. Ataur Rahman  Raju Dash  Abdullah Al Mamun Sohag  Mahboob Alam  Hyewhon Rhim  Hunjoo Ha  Il Soo Moon  Md Jamal Uddin  Md. Abdul Hannan 《Marine drugs》2021,19(3)

Alzheimer’s disease (AD) is a degenerative brain disorder characterized by a progressive decline in memory and cognition, mostly affecting the elderly. Numerous functional bioactives have been reported in marine organisms, and anti-Alzheimer’s agents derived from marine resources have gained attention as a promising approach to treat AD pathogenesis. Marine sterols have been investigated for several health benefits, including anti-cancer, anti-obesity, anti-diabetes, anti-aging, and anti-Alzheimer’s activities, owing to their anti-inflammatory and antioxidant properties. Marine sterols interact with various proteins and enzymes participating via diverse cellular systems such as apoptosis, the antioxidant defense system, immune response, and cholesterol homeostasis. Here, we briefly overview the potential of marine sterols against the pathology of AD and provide an insight into their pharmacological mechanisms. We also highlight technological advances that may lead to the potential application of marine sterols in the prevention and therapy of AD.  相似文献   

基于SI-Albedo特征空间的土壤盐渍化遥感监测指数研究   总被引：1，自引：0，他引：1  

哈学萍  丁建丽  塔西甫拉提?特依拜  高婷婷  张飞 《土壤学报》2009,46(4):698-703

土壤盐渍化通常出现在气候干旱、土壤蒸发强度大、地下水位高且含有较多可溶性盐类的地区。它是一定的气候、地形、水文地质等自然条件共同对水盐运动产生影响的结果[1],这是一个复杂的动力学过程。因而对土壤盐渍化的探测、动态监测和制图是一项较为困难的工作。遥感技术能大面积重复获取同一地区的信息,具有宏观、综合、动态、快速的特点,并在速度、精度和成本花费方面凸显出众多优势[2]。现阶段运用遥感手段提取土壤盐渍化信息主要有两个方面:一是对遥感图像做相应的处理,突出盐渍化信息,但此种方法需要大量的实验;二是引入土壤含盐量、地下水等辅助量,但是引入的辅助量会引起图像的破碎化,有时难以满足要求,分类精度受到一定程  相似文献   

Development of salt tolerant IR64 near isogenic lines through marker-assisted breeding     

Viet The Ho  Michael J. Thomson  Abdelbagi M. Ismail 《Journal of Crop Science and Biotechnology》2016,19(5):373-381

Salt stress causes considerable damage to rice with a consequent reduction in grain yield, however, conventional breeding for this stress is time-consuming and costly. Recently, marker-assisted breeding has shown enormous potential to accelerate breeding of stress tolerant varieties because of its precision, time saving, and cost effectiveness. The present study was carried out to transfer Saltol, a major QTL on chromosome 1 associated with salinity tolerance, from FL478, a tolerant genotype, into IR64, a popular lowland variety through marker-assisted backcrossing (MABC). This technique considerably enhanced the recovery rate of the recurrent parent genome within three backcross generations, which could have saved several backcrosses compared with conventional schemes to achieve the same results. By using this technique, up to 99.7% of the recurrent parent genome was recovered at BC₃F₂ generation, saving at least three backcrosses compared with conventional breeding schemes. Salinity tolerance of IR64-Saltol lines was evaluated using saline culture solution adjusted to electrical conductivity of 12 dS m^-1 using NaCl. Based on selected physiological and growth parameters, the new Saltol introgression lines showed a significantly higher tolerance of salinity than their recurrent parent IR64. The results of this study confirm the benefits of using molecular markers in plant breeding to enhance tolerance of abiotic stresses.  相似文献   

Effects of Temperature,Polymer Dose,and Solid Concentration on the Rheological Characteristics and Dewaterability of Digested Sludge of Wastewater Treatment Plant (WWTP)     

Anteneh Mesfin Yeneneh  Eugene Hong  Tushar Kanti Sen  Ahmet Kayaalp  Ha Ming Ang 《Water, air, and soil pollution》2016,227(4):119

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Production of silkworms with conjugated linoleic acid (CLA) incorporated into their lipids by dietary CLA     

Park CG  Park GB  Kim YS  Kim SJ  Min DB  Ha YL 《Journal of agricultural and food chemistry》2006,54(18):6572-6577

Silkworms with conjugated linoleic acid (CLA) incorporated into their lipids (designated CLA silkworms) were produced to enhance the quality of silkworms having a synergistic effect with CLA functions by dietary synthetic CLA. Silkworm larvae were fed fresh mulberry leaves (control diet) until the third instar stage and were then subjected to various levels (0%, 0.1%, 1%, 5%, and 10%) of CLA-sprayed mulberry leaves (designated CLA diet) beginning on the first day of the fourth instar stage and continuing to the third day of the fifth instar stage. CLA contents in CLA silkworms increased proportionally with increasing CLA levels of CLA diets. CLA silkworms on a 1% CLA diet contained 2.2 g CLA/100 g lipid without body weight reduction, whereas CLA silkworms on a 10% CLA diet contained 14.8 g CLA/100 g lipid with a significant reduction of body weight, relative to the control silkworms. The CLA content in the lipids of CLA silkworms on a 10% CLA diet was significantly higher than that of CLA silkworms on a 5% CLA diet. A 0.1% CLA diet was not sufficient to accumulate CLA in the silkworms. Most of the CLA (approximately 99%) of silkworm lipids was present in triglyceride (TG) with a similar ratio of c9,t11 and t10,c12 CLA isomers. These results suggest that a 1% CLA diet was suitable for the production of CLA silkworms.  相似文献   

Reproductive performance in sows in relation to Japanese Encephalitis Virus seropositivity in an endemic area     

Lindahl J  Boqvist S  Ståhl K  Thu HT  Magnusson U 《Tropical animal health and production》2012,44(2):239-245

Japanese Encephalitis Virus (JEV) is considered an important reproductive pathogen in pigs. Most studies of the reproductive impact of JEV have been conducted in areas where the disease occurs in seasonal epidemics. In this study, the associations between seropositivity for JEV, measured with an IgG ELISA, and the number of piglets born alive and stillborn were investigated in a tropical area endemic for JEV in Vietnam. Sixty percent of sows from four farms in the Mekong delta of Vietnam were seropositive to JEV and the Odds Ratio for a sow being infected was highest (6.4) in sows above 3.5 years (95% confidence interval 2.2–18.3). There was an association between increasing Optical Density (OD) values from the ELISA and the number of stillborn piglets in sows less than 1.5 years, but no effect of seropositivity could be shown when all sows were studied. OD values had an effect (p = 0.04) on the number of piglets born alive in the statistical analysis only when interacting with the effect of the breeds. An increase in mean OD value of the herd was correlated (p < 0.0001) with an increase in the number of piglets born alive. In this study, there was evidence of a negative association between seropositivity for JEV and the reproductive performance only in sows less than 1.5 years in endemic areas. This could be explained by a year-round infection with the virus, which would lead to immunity in many gilts before their first pregnancy. This, in turn, may imply that JEV infection in pigs is of minor importance for the reproductive performance in endemic areas.  相似文献   

鸡公山野生木本蔬菜资源调查   总被引：1，自引：0，他引：1  

哈登龙  李培学  戴慧堂  方成良  石冠红 《中国林副特产》2009,(6):78-80

木本蔬菜绿色食品,营养价值高,开发潜力大。于2008年对鸡公山野生木本蔬菜资源进行调查,结果表明鸡公山有野生木本蔬菜植物34科74种,并对其开发利用提出建议。  相似文献   

Participatory research on the effectiveness of drainage in the Red River Delta,Vietnam     

H. P. Ritzema  Le Dinh Thinh  Le Quang Anh  Dang Ngoc Hanh  Nguyen Viet Chien  Trinh Ngoc Lan  R. A. L. Kselik  Bui Thi Kim 《Irrigation and Drainage Systems》2008,22(1):19-34

The irrigation and drainage systems in the Red River Delta in Vietnam were designed and constructed in the 1950s and 60s. These systems are well established and provide water to virtually all of the irrigable land in the Delta. The land is cropped intensively: on average just over two crops a year. The irrigation and drainage systems are complex: dual purpose channels and pumping stations are used. In the 1990s, the systems were rehabilitated and upgraded. A review showed that irrigation projects performed reasonably well, but the two core drainage projects performed less than anticipated. In the Red River Delta, with its low elevations, drainage rather than irrigation is often the limiting factor affecting agricultural production. To investigate these constraints in more detail, a participatory research study on the effectiveness of drainage was conducted in two drainage areas in the Red River Delta. The study started with a participatory pre-investigation to identify and quantify the constraints in the functioning of the drainage systems. Next, the drainage system was modelled and computer simulations were used to develop conceptual designs to improve the functioning of the systems. Finally, recommendations to improve the institutional capacity of the drainage system management were formulated, again in close cooperation with the stakeholders. These recommendations cover a whole range of technical issues: small-scale improvements in the farmers’ fields, modifications in the main and secondary drainage systems, including the control structures, up to recommendations to increase the efficiency of the pumping stations. Next to these technical innovations, recommendations to reform the complex institutional setting have been formulated.  相似文献