Hiệu quả của bón bùn đáy mương hệ thống canh tác lúa-tôm đối với độ phì nhiêu đất và năng suất lúa ở huyện Thới Bình, tỉnh Cà Mau

Nghiên cứu được thực hiện nhằm mục đích đánh giá hiệu quả của bón bùn đáy mương đối với một số đặc tính hóa học liên quan đến độ phì nhiêu đất và năng suất lúa trong mô hình canh tác lúa-tôm. Thí nghiệm đồng ruộng được bố trí theo khối hoàn toàn ngẫu nhiên với 4 lần lặp lại cho mỗi nghiệm thức. Các nghiệm thức (NT) gồm: NT1 - không bón phân (đối chứng); NT2 - bón 5 cm bùn đáy mương; NT3 - bón phân NPK (60 N-40 P2O5-30 K2O kg/ha); NT4 - bón phân NPK với lượng bằng 2/3 của NT3 (40 N-27 P2O5-20 K2O kg/ha); NT5 - bón bùn kết hợp phân NPK với lượng như NT4. Kết quả nghiên cứu cho thấy hàm lượng đạm được khoáng của NT được bón bùn cao hơn có khác biệt ý nghĩa so với không bón bùn (

Human case of Streptococcus suis serotype 16 infection.

Streptococcus suis infection is an emerging zoonosis in Southeast Asia. We report a fatal case of S. suis serotype 16 infection in a Vietnamese man in 2001

Performance Evaluation of a Class of Gravity-Compensated Gear-Spring Planar Articulated Manipulators

This paper is devoted to evaluating the gravity compensation performance of a special class of planar articulated manipulators that are gravity balanced by using a series of gear-spring modules. First, the studied manipulators with one, two, and three DOFs are revisited. Then, the gravity compensation performance of these manipulators is determined via a peak-to-peak torque reduction criterion. As the manipulators were designed via two different approaches, i.e., the ideal balancing approximation and the realistic optimization, the gravity compensation performance of these two approaches is compared. It shows that the perfect balancing approximation can achieve a satisfied performance as nearly same as that of the optimization approach, while it, on the other hand, enjoys a significant reduction of the computational effort for gravity compensation design

Streptococcus suis meningitis in adults in Vietnam.

BACKGROUND: Streptococcus suis infection is an emerging zoonosis in Asia. We determined the detailed epidemiological, clinical, and microbiological characteristics of S. suis meningitis in adults. METHODS: We prospectively studied 450 patients with suspected bacterial meningitis. Four hundred thirty-five (96.7%) of the patients participated in a trial to determine the effect of adjunctive dexamethasone treatment. For patients with S. suis infection, bacterial DNA load at hospital admission and during treatment was analyzed in cerebrospinal fluid specimens using quantitative real-time polymerase chain reaction. S. suis strains were characterized using pulsed-field gel electrophoresis and multilocus sequence typing. Putative virulence factors, including extracellular protein factor, suilysin, and muramidase released protein, were detected using polymerase chain reaction and Western blot assay. Predictors of outcome were identified using logistic regression analysis. RESULTS: S. suis was the most common pathogen and was detected in 151 (33.6%) of the patients. Fifty (33.1%) of these 151 patients reported exposure to pigs or pork. Mortality was low (2.6%; 4 of 151 patients died), but mild to severe hearing loss occurred in 93 (66.4%) of 140 patients. Severe deafness at hospital discharge was associated with age >50 years (odds ratio, 3.65; 95% confidence interval, 1.15-11.6), a strain carrying the epf gene (odds ratio, 3.42; 95% confidence interval, 1.02-11.4), and dexamethasone therapy (odds ratio, 0.23; 95% confidence interval, 0.06-0.78) but was not associated with cerebrospinal fluid bacterial DNA load. Bacterial DNA was still detectable in 58 (63%) of 92 cerebrospinal fluid samples after 6-10 days of antimicrobial treatment. Ninety-one of 92 S. suis strains had serotype 2. Thirty-three (36%) of these epidemiologically unrelated strains belonged to 1 pulsed-field gel electrophoresis cluster of multilocus sequence type 1, indicating clonal spread. CONCLUSION: S. suis serotype 2 is the most frequent cause of bacterial meningitis in adults in southern Vietnam and is associated with substantial morbidity attributable to hearing loss