Objective:To study the distribution of marine luminous bacteria in shrimp culture systems of West Bengal and the effect of polyculture of shrimp with fish to reduce luminous bacteria.Methods:Luminous bacterial counts ...Objective:To study the distribution of marine luminous bacteria in shrimp culture systems of West Bengal and the effect of polyculture of shrimp with fish to reduce luminous bacteria.Methods:Luminous bacterial counts were enumerated by spread plating on seawater complex agar from shrimp grow-out pond water and pond sediment samples of West Bengal,India.Results:About 31.16%and 51.44%of pond sediment and pond water samples respectively had detectable levels of luminous bacteria.It was noticed that in normal ponds a shift happened in bacterial profile of water from the day of flooding up to 60 d,with the dominance of luminous bacteria among vibrios,reaching counts 10^(4) cells/mL or more.While in diseased ponds,luminous bacterial abundance within the ponds was noticed in the first 6 weeks of culture.Marked reduction in luminous bacterial counts of water and sediment was observed through out the culture period in polyculture ponds compared to monoculture ponds.There was no incidence of white spot syndrome viral disease and luminous vibriosis in both controlled and experimental ponds.Conclusions:The results suggest vigilant monitoring of ponds for luminous bacteria abundance and polyculture of shrimp with fish in ecofriendly sustainable aquaculture can reduce the impact of shrimp disease outbreak.展开更多
Colorectal cancer （CRC） is a multistage disease resulting from complex factors, including genetic mutations, epigenetic changes, chronic inflammation, diet, and lifestyle. Recent accumulating evidence suggests that ...Colorectal cancer （CRC） is a multistage disease resulting from complex factors, including genetic mutations, epigenetic changes, chronic inflammation, diet, and lifestyle. Recent accumulating evidence suggests that the gut microbiota is a new and important player in the development of CRC. Imbalance of the gut microbiota, especially dysregulated gut bacteria, contributes to colon cancer through mechanisms of inflammation, host defense modulations, oxidative stress, and alterations in bacterial-derived metabolism. Gut commensal bacteria are anatomically defined as four populations： luminal commensal bacteria, mucus-resident bacteria, epithelium-resident bacteria, and lymphoid tissue-resident commensal bacteria. The bacterial flora that are harbored in the gastrointestinal （GI） tract vary both longitudinally and cross-sectionally by different anatomical localization. It is notable that the translocation of colonic commensal bacteria is closely related to CRC progression. CRC-associated bacteria can serve as a noninvasive and accurate biomarker for CRC diagnosis. In this review, we summarize recent findings on the oncogenic roles of gut bacteria with different anatomical localization in CRC progression.展开更多
基金Supported by the Indian Council of Agricultural Research,Government of India,New Delhi under the National Agricultural Technology Project.
文摘Objective:To study the distribution of marine luminous bacteria in shrimp culture systems of West Bengal and the effect of polyculture of shrimp with fish to reduce luminous bacteria.Methods:Luminous bacterial counts were enumerated by spread plating on seawater complex agar from shrimp grow-out pond water and pond sediment samples of West Bengal,India.Results:About 31.16%and 51.44%of pond sediment and pond water samples respectively had detectable levels of luminous bacteria.It was noticed that in normal ponds a shift happened in bacterial profile of water from the day of flooding up to 60 d,with the dominance of luminous bacteria among vibrios,reaching counts 10^(4) cells/mL or more.While in diseased ponds,luminous bacterial abundance within the ponds was noticed in the first 6 weeks of culture.Marked reduction in luminous bacterial counts of water and sediment was observed through out the culture period in polyculture ponds compared to monoculture ponds.There was no incidence of white spot syndrome viral disease and luminous vibriosis in both controlled and experimental ponds.Conclusions:The results suggest vigilant monitoring of ponds for luminous bacteria abundance and polyculture of shrimp with fish in ecofriendly sustainable aquaculture can reduce the impact of shrimp disease outbreak.
基金This project was supported by RGC-GRF Hong l（ong （766613, 14106145）, the National Basic Research Program of China （2013CB531401）, the National Natural Science Foundation of China （NSFC） （81201963, 81372600）, the Shenzhen Municipal Science and Technology R＆D fund （JCYJ20120619152326450）, and the Shenzhen Virtual University Park Support Scheme to CUHK Shenzhen Research Institute.
文摘Colorectal cancer （CRC） is a multistage disease resulting from complex factors, including genetic mutations, epigenetic changes, chronic inflammation, diet, and lifestyle. Recent accumulating evidence suggests that the gut microbiota is a new and important player in the development of CRC. Imbalance of the gut microbiota, especially dysregulated gut bacteria, contributes to colon cancer through mechanisms of inflammation, host defense modulations, oxidative stress, and alterations in bacterial-derived metabolism. Gut commensal bacteria are anatomically defined as four populations： luminal commensal bacteria, mucus-resident bacteria, epithelium-resident bacteria, and lymphoid tissue-resident commensal bacteria. The bacterial flora that are harbored in the gastrointestinal （GI） tract vary both longitudinally and cross-sectionally by different anatomical localization. It is notable that the translocation of colonic commensal bacteria is closely related to CRC progression. CRC-associated bacteria can serve as a noninvasive and accurate biomarker for CRC diagnosis. In this review, we summarize recent findings on the oncogenic roles of gut bacteria with different anatomical localization in CRC progression.
