Biocontrol activity of Vibrio parahaemolyticusNT7 isolated from the shrimp acute hepatopancreatic necrosis syndrome (Ahpns) by Bacillus polyfermenticusF27 isolated from perionyx excavatus

cute Hepatopancreatic Necrosis Syndrome -AHPNSof cultured shrimp was first detected in China in 2009 and caused huge damage to shrimp farming in many countries including Vietnam. This study investigates the ability to inhibit Vibrio parahaemolyticuswhich causes hepatopancreatic necrosis of some Bacillusstrains. V. parahaemolyticusNT7 of this research was isolated from a white leg shrimp sample with hepatopancreatic necrosis in Ninh Thuan province and identified by biochemical methods. By the cross-steak and well-diffusion methods, the selected strain Bacillus polyfermenticusF27 showsthe largest diameter of 18.50 mm resistance to V.parahaemolyticus NT7.B. polyfermenticus F27strain caninhibitV. parahaemolyticus NT7. Besides, B. polyfermenticusF27 inhibits V. parahaemolyticusNT7 with co-cultured experiment and does not cause hemolysis. It is also safe for white leg shrimp seed with a 100% survival rate of the experimental treatments. The result of LD50 examination when infecting V.parahaemolyticus NT7 to white leg shrimp seed is 105CFU/ml. Through the host protectioncapability assessment of B. polyfermenticusF27, we found that itcanprotect white leg shrimp seed from V. parahaemolyticus.The findings show that strains of B. polyfermenticusF27 have the potential to produce probiotics for controland preventionof EMS/AHPNS of shrimps

Cơ sở Matlab và ứng dụng : Giáo trình cho các trường Đại học và Cao đẳng

233 tr. : minh hoạ ; 24 cm

Bài tập đại số 10 nâng cao

264 tr. ; 24 cm

Các Đại hội đại biểu toàn quốc và Hội nghị ban Chấp hành Trung ương Đảng Cộng sản Việt Nam 1930 - 2006

727 tr. ; 24 cm

Survey of VietGAP vegetables natural enemies and insect pests in Hoc Mon district and study on capacity of parasitism of endoparasitoid Cotesia plutellae Kurdjumov

Studies were conducted at four VietGAP standardvegetable fields (Hoc Mon District, Ho Chi Minh City) from August 2013 to April 2014 in order to investigate the species of insect pest, natural enemies on vegetablesgrownby VietGAP program. The results indicatedthat 60species, 43families, 23orders including 34insect pests, 26species of natural enemieswere found in this study. Moreover, parasitoid Cotesia plutellae had significantdifference in high rate of parasitism on second instar of Plutella xylostella in comparison with other instars. Natural enemiesknown asan important role in the regulation of the number of insect pestsare discussed