Drought-tolerant rice varieties are one of the best choices to avoid the effects of drought. A Randomized Complete Block Design (RCBD) with three replications was used for the experiment. 12 seasonal rice were tested under artificial drought conditions. The criteria were assessed through the morphology, root anatomical structure, and stomatal leaves that were suitable for the drought environment. The results showed that 3 seasonal rice were well adapted to this condition.Sophinh had the smallest density and area of stomata (529.3 stomata/mm2 and 88.6 μm2 respectively), they helped reduce water loss. Xuong ga do had the highest ratio of deep roots 58.7% which could increase the ability to take water from the deep soil layer. Bang nau had a thick root diameter of 876.3 μm and a stele root area of 54.4x103 μm2 containing a high number and more areas of late metaxylems (5.6 and 12x103 μm2 respectively). These factors helped increase water flux from root to shoot. Correlation among the density of stomata, number of roots, and the number of late metaxylem were negative while correlation among diameter of roots, number of late metaxylem, and total areas of late metaxylem were positive. These results were useful for developing drought-tolerant rice varieties.

Background: By combining diffisive and convective with a large volume in the same exchange method, Online Haemodiafiltration provide the highest clearances of both small and large solutes in the end stage renal disease patients who treated by maintenance hemodialysis. Objective: To investigate the serum levels of Ure, creatinin, phosphorus, Beta2-microglobulin and Homocystein before and after one session of Online Hemodiafiltration and one session of conventional Hemodialysis in the same patient. Method: Cross – sectional study. Results: 34 patients were treated by combining one session Online Hemodiafiltration and two sessions intermittent Hemodialysis/week. The urea reduction rate: 76.61 ± 7.37% Online Hemodiafiltration compare with 69.90 ± 7.55% conventional hemodialysis; the creatinin reduction rate: 67.76 ± 6.05% Online Hemodiafiltration compare with 61.40 ± 7.82% conventional hemodialysis; the phospho reduction rate: 52.37 ± 14.47% Online Hemodiafiltration compare with 42.81 ± 21.39% conventional hemodialysis; the Beta 2-microglobulin reduction rate: 72.42 ± 7.60% Online Hemodifiltration compare with 56.91 ± 12.76% conventional hemodialysis; the Homocysteine reduction rate: 43.23 ± 15.46% Online Hemodiafiltration compare with 33.68 ± 14.72% conventional hemodialysis. A differrent in two methods was significally and the solute reduction rate was higher with Online Hemodiafiltration, p < 0.01. Conclusion: Online Haemodiafiltration provide the highest clearances of both small and large solutes and helping to improve patient’s survival and quality of life.

This paper represents the whole process of analyzing negative sentences in English and Vietnamese by comparing the negation in the two languages. Besides, it is an effort to contribute to the field of contrastive analysis of English-Vietnamese language. The scope of this study focuses on the simple negative sentences. The study is divided into three parts: showing simple negative sentences in English, showing simple negative sentences in Vietnamese and comparing some differences and similarities between simple negative sentences in English and simple negative sentences in Vietnamese