Anti- SEA Monoclonal antibody, Clone C007N

Seasonal nutrient dynamics regulated by hydrological and biological variables in the southern Yellow Sea (SYS) were studied based on the datasets collected during four cruises: spring (April 28-May 10, 2014), summer (August 17-September 22, 2015), autumn (November 7-17, 2014) and winter (January 13-February 1, 2016). In the present study, by dividing the study area into three distinct current-dominated subregions based on T-S distribution, cluster analysis, and principal components analysis (PCA), we revealed that the response mechanisms of nutrients to physical and biological processes were important. Among all factors, the physical processes, mainly including the Yellow Sea Cold Water Mass (YSCWM) onset, the Changjiang (Yangtze) Diluted water (CDW) and Taiwan Warm Current (TWC) intrusion and the Yellow Sea Warm Current (YSWC) invasion, were the principal driving force, which significantly changed the inherent balance of nutrient structure. Meanwhile, biological depletion was also a significant factor, especially in the stratified seasons, even though its impact on the nutrient structure could be balanced by vigorous water exchange or vertical mixing. The regional variation of nutrient regime and the regulatory mechanism behind it were revealed at the same time. The coastal area showed strong signs of potential P limitation as a result of excessive dissolved inorganic nitrogen (DIN) entering via terrestrial runoff and anthropogenic activities. The 32 degrees N transect, which is adjacent to the boundary of the SYS and the East China Sea (ECS), showed varying hydrological features due to the strong intrusion of CDW and TWC. Therefore, P or Si were the main limiting factor for the development of algal biomass. The central study area possessed a comparatively stable water column with the specific existence of the YSCWM present at the bottom, thus acting as a potential nutrient pool. Hence, we hypothesized that the offshore side of the study area tended to be more P and N co-limited, whereas the nutrient cycles in the nearshore side showed significant seasonal and regional variations, which corresponded to the change in physical oceanographic processes and algal biomass.

Tetrodotoxins are a potent neumtoxic class of toxins with potentially fatal effects if ingested by humans, and thus, these toxins are a dangerous threat for food safety. Tetrodotoxins are widely distributed among various organisms of different taxa, i.e. pufferfish, blue-ringed octopuses and marine gastropods. Lately the presence of these toxins has been reported in mussels (Mytilus sp.). Countries like the United Kingdom, Greece, the Netherlands, and Italy have increasingly notified the detection of tetrodotoxins in these bivalves, which are widely diffused in European shellfish farming. In this context we report, for the first time, the detection of substantial amounts of tetmdotoxins in Mytilus ganoprovincialis collected in Italy in a single area of the Northern Adriatic Sea (Marano Lagoon). Tetrodotoxin-positive mussels were identified in samples collected from that geographic area at the end of May in the context of official monitoring programs both in 2017 and 2018. After the positive results were obtained by means of mouse bioassay screening, tetrodotoxins were detected and quantified by HILIC-MS/MS, revealing the bioaccumulation in the mussels of 541 and 216 mu g/kg in 2017 and 2018 respectively, the highest amount ever found in mollusks in Europe. The presence of tetmdotoxins at the concentration of 413 mu g/kg was further confirmed with Liquid Chromatography coupled to High Resolution Mass Spectrometry in the mussels sampled in 2017.