to funistic survey of the cercariae of melanoides tuberulata (fresh water snail) 1540 m.tuberculata were collected from various streams, swamps, ditches and canals in the central area of khouzestan province in the south west of iran. infected snails, 46 (2.9%), were isolated and cercariae were obtained by emerging or crushing methods and then measuring and drawing were made from specimens. in s...

Changes in the seasonal dynamics of phytoplankton are potentially important, because they can generate a mismatch between the timing of peak productivity and that of consumers, thereby interrupting energy flow between trophic levels. Here, we use a long term data set for the phytoplankton community in the southern basin of Lake Baikal, Siberia to analyse for changes in the seasonal timing of pe...

Commercial carotenoids of green microalgae have become significant especially for their applications in the cosmetic, pharmaceutical, food and feed industries. Effects physical chemical parameters on carotenoid contents isolated microalgal species been investigated. The variables shaking rate, nitrogen concentration light intensity affect biomass production synthesis were investigated using sta...