| identification and estimation of microcystins in freshwater mussels. | accumulation of microcystins mainly produced by cyanobacteria microcystis was investigated for freshwater mussels and fishes collected from a lake where heavy blooms of microcystis occurred every year. the identification of microcystins was performed by hplc equipped with a frit fab mass spectrometer. microcystins lr and rr were identified in the mussels unio douglasiae and anadonta woodiana, whereas no microcystin was identified by the present method in fishes, such as cyprinus carpio, carassiu ... | 1997 | 9086457 |
| mechanism and prediction for contamination of freshwater bivalves (unionidae) with the cyanobacterial toxin microcystin in hypereutrophic lake suwa, japan. | seasonal changes of microcystin (mc) bioaccumulation in three freshwater unionid bivalves, anodonta woodiana, cristaria plicata, and unio douglasiae, were investigated in the hypereutrophic lake suwa. total mc concentrations (mc-rr and -lr) as determined by reverse-phase high-performance liquid chromatography were at high levels in the hepatopancreas of c. plicata and u. douglasiae, with maxima at 297 and 420 microg/g dry weight, respectively. the amounts and seasonal changes in the accumulated ... | 2002 | 12242672 |
| depuration kinetics and persistence of the cyanobacterial toxin microcystin-lr in the freshwater bivalve unio douglasiae. | we carried out uptake and depuration experiments in the laboratory to investigate the effects of temperature (15 degrees c and 25 degrees c) on the depuration kinetics and persistence of a cyanobacterial toxin, microcystin-lr (mcyst-lr), in a freshwater bivalve, unio douglasiae. bivalves were fed toxic microcystis cells in the 15-day uptake experiment and nontoxic diatoms in the following 15-day depuration experiment. each bivalve's hepatopancreas was lyophilized and extracted with a butanol:met ... | 2003 | 12539145 |
| [distribution of medically important freshwater snails and larval trematodes from parafossarulus manchouricus and semisulcospira libertina around the jinyang lake in kyongsang-nam-do, korea] | the jinyang lake is dammed up nam river, and surrounded by jinju city and four counties; jinyang, sanchong, hadong, and sachon in kyongsang-nam-do, korea. the area around this man-made lake have been known as an endemic focus of clonorchiasis in korea. the present study was first aimed to know the distribution of freshwater mollusks including medically important snails, and larval trematodes shed from parafossarulus manchouricus and semisulcospira libertina. in addtion to above studies, water an ... | 1983 | 12902649 |
| mid-neolithic exploitation of mollusks in the guanzhong basin of northwestern china: preliminary results. | mollusk remains are abundant in archaeological sites in the guanzhong basin of northwestern china, providing good opportunities for investigations into the use of mollusks by prehistoric humans. here we report on freshwater gastropod and bivalve mollusks covering the time interval from about 5600 to 4500 cal. yrs bp from sites of mid-late neolithic age. they are identified as cipangopaludina chinensis and unio douglasiae, both of which are currently food for humans. the shells are well preserved ... | 2013 | 23544050 |
| identification of carotenoids in the freshwater shellfish unio douglasiae nipponensis, anodonta lauta, cipangopaludina chinensis laeta, and semisulcospira libertina. | the biochemical properties of carotenoids from 2 species of freshwater bivalve, namely, unio douglasiae nipponensis and anodonta lauta, and 2 species of freshwater snail, namely, cipangopaludina chinensis laeta and semisulcospira libertina, were investigated. diatoxanthin and fucoxanthin were identified as major carotenoids in both bivalves. in contrast, lutein and zeaxanthin were found to be the major carotenoids in c. chinensis laeta. in addition, a series of keto carotenoids was also identifi ... | 2012 | 22277890 |