Mangroves are unique in their biodiversity,but studies on their meiobenthic biodiversity in China are scarce.Despite the importance of mangroves,little work has been done on the classification of nematodes in mangrove...Mangroves are unique in their biodiversity,but studies on their meiobenthic biodiversity in China are scarce.Despite the importance of mangroves,little work has been done on the classification of nematodes in mangrove wetlands.Fujian Province is the most northern point of China’s natural mangrove distribution,and it is also one of the provinces with the earliest constructed mangrove forest.In this paper,two new free-living marine nematode species of Desmodoridae from the Xiamen mangrove wetlands in China are described.Metachromadora xiamenensis sp.nov.is characterized by a cylindrical body,and smooth head capsule set off from the rest of the body.The cuticle is finely annulated and thickened at the midbody.Lateral ridges run from the posterior end of the pharynx to the middle of the tail.The amphid foveae is loop shaped and opens at the top with a double contour amphidial,pharynx with bipartite cuticularized internal cavity.There are 18 tubular precloacal supplements and tail with three small protuberances.Molgolaimus euryformis sp.nov.is characterized by a relatively short and plump body with finely annulated cuticle,which is particularly obvious in the tail.The head is small and wide with intensive striates.The inner and outer labial sensilla are indistinct with short spicules and ventral apophysis,a gubernaculum with a block-shaped hook,a swollen conical-cylindrical tail and an absence of precloacal supplements.展开更多
A gram-negative, motile, and rod-shaped bacterium, strain JF02, was isolated from the liver of diseased GIFT （ genetically improved farmed tilapia） in Hainan, China. The strain JF02 was lethal to GIFT, and most GIFT...A gram-negative, motile, and rod-shaped bacterium, strain JF02, was isolated from the liver of diseased GIFT （ genetically improved farmed tilapia） in Hainan, China. The strain JF02 was lethal to GIFT, and most GIFT infected with JF02 exhibited the same clinical signs, such as black body, pale or focally necrosis of the gills, scale shedding, fin rot, liver hyperemia, and hydroabdomen. The 16S rRNA gene sequences of strain JF02 showed 99.7% similarity with that of Shewanella xiamenensis strain S4^T. In addition, the gyrB gene sequences of strain JF02 showed 99.0% similarity with that of S. xiarrvenertsis strain S4^T. Combining the results of morphological, physiological and biochemical characteristics, the isolated strain JF02 was confirmed to be S. xiamenensis. The chemotherapeutic antibiotics tests showed that the strain JF02 was sensitive to most antibiotics except for several common antibiotics that were frequently used in human medicines and treatment of bacterial diseases of fish, indicating that the strain JF02 has obtained many antibiotic resistance genes due to the long-term abuse of antibiotics in aquaculture. In this paper, it was the first time to report that the S. xiamenensis may be a potential pathogen for GIFT. It is time to promote awareness of the potential harm of this strain to the health of human and aquatic animals.展开更多
以厦门树白蚁(Glyptotermes XiamenensisLi et Huang)为原料,经PBS缓冲液(pH6.7)抽提、硫酸铵分级分离获得纤维素酶粗提物(简称EGase),经DEAE-Sepharose Fast Flow阴离子交换柱层析、Shephadex G-100凝胶过滤柱层析等纯化,得到电泳单一...以厦门树白蚁(Glyptotermes XiamenensisLi et Huang)为原料,经PBS缓冲液(pH6.7)抽提、硫酸铵分级分离获得纤维素酶粗提物(简称EGase),经DEAE-Sepharose Fast Flow阴离子交换柱层析、Shephadex G-100凝胶过滤柱层析等纯化,得到电泳单一纯的酶制剂,比活力为458.7 U/mg.研究了金属离子对该酶活力的影响:结果表明,正一价金属离子Li+、Na+、K+对酶活力没有影响,Ca2+、Zn2+和Mn2+有激活作用,重金属离子Cu2+、Pb2+和Hg2+有抑制作用,表现为不可逆抑制.展开更多
基金funded by the National Natural Science Foundation of China (No. 41606119)the Provincial Natural Science Foundation of Fujian (No. 2017J05068)the New Century Outstanding Talents Support Program for Institutions of Higher Learning in Fujian Province and Building Ecological Security for Urban Agglomeration and Integrating Ecological Restoration Techniques for Coastal Zones in Fujian River Deltas (No. 2016YFC0502900)
文摘Mangroves are unique in their biodiversity,but studies on their meiobenthic biodiversity in China are scarce.Despite the importance of mangroves,little work has been done on the classification of nematodes in mangrove wetlands.Fujian Province is the most northern point of China’s natural mangrove distribution,and it is also one of the provinces with the earliest constructed mangrove forest.In this paper,two new free-living marine nematode species of Desmodoridae from the Xiamen mangrove wetlands in China are described.Metachromadora xiamenensis sp.nov.is characterized by a cylindrical body,and smooth head capsule set off from the rest of the body.The cuticle is finely annulated and thickened at the midbody.Lateral ridges run from the posterior end of the pharynx to the middle of the tail.The amphid foveae is loop shaped and opens at the top with a double contour amphidial,pharynx with bipartite cuticularized internal cavity.There are 18 tubular precloacal supplements and tail with three small protuberances.Molgolaimus euryformis sp.nov.is characterized by a relatively short and plump body with finely annulated cuticle,which is particularly obvious in the tail.The head is small and wide with intensive striates.The inner and outer labial sensilla are indistinct with short spicules and ventral apophysis,a gubernaculum with a block-shaped hook,a swollen conical-cylindrical tail and an absence of precloacal supplements.
基金Supported by Major Scientific and Technological Projects of Hainan Province(ZDKJ2016009)grant from the Doctoral Research Project of Hainan Tropical Ocean University
文摘A gram-negative, motile, and rod-shaped bacterium, strain JF02, was isolated from the liver of diseased GIFT （ genetically improved farmed tilapia） in Hainan, China. The strain JF02 was lethal to GIFT, and most GIFT infected with JF02 exhibited the same clinical signs, such as black body, pale or focally necrosis of the gills, scale shedding, fin rot, liver hyperemia, and hydroabdomen. The 16S rRNA gene sequences of strain JF02 showed 99.7% similarity with that of Shewanella xiamenensis strain S4^T. In addition, the gyrB gene sequences of strain JF02 showed 99.0% similarity with that of S. xiarrvenertsis strain S4^T. Combining the results of morphological, physiological and biochemical characteristics, the isolated strain JF02 was confirmed to be S. xiamenensis. The chemotherapeutic antibiotics tests showed that the strain JF02 was sensitive to most antibiotics except for several common antibiotics that were frequently used in human medicines and treatment of bacterial diseases of fish, indicating that the strain JF02 has obtained many antibiotic resistance genes due to the long-term abuse of antibiotics in aquaculture. In this paper, it was the first time to report that the S. xiamenensis may be a potential pathogen for GIFT. It is time to promote awareness of the potential harm of this strain to the health of human and aquatic animals.
文摘以厦门树白蚁(Glyptotermes XiamenensisLi et Huang)为原料,经PBS缓冲液(pH6.7)抽提、硫酸铵分级分离获得纤维素酶粗提物(简称EGase),经DEAE-Sepharose Fast Flow阴离子交换柱层析、Shephadex G-100凝胶过滤柱层析等纯化,得到电泳单一纯的酶制剂,比活力为458.7 U/mg.研究了金属离子对该酶活力的影响:结果表明,正一价金属离子Li+、Na+、K+对酶活力没有影响,Ca2+、Zn2+和Mn2+有激活作用,重金属离子Cu2+、Pb2+和Hg2+有抑制作用,表现为不可逆抑制.
