| vitamin b 12 production and depletion in a naturally occurring eutrophic lake. | the distribution of vitamin b(12) within upper klamath lake was surveyed at approximately monthly intervals during a period from september 1968 to november 1969. high concentrations (up to 1.8 mug/g of dry sediment) characteristically occurred at the water-sediment interface, with a sharp decline below this area. a heavy bloom of aphanizomenon flos-aquae occurred from the latter part of may through october 1969. b(12) concentrations of the uppermost sediments, from all but one sampling site, inc ... | 1972 | 4622828 |
| benthic nutrient sources to hypereutrophic upper klamath lake, oregon, usa. | three collecting trips were coordinated in april, may, and august 2006 to sample the water column and benthos of hypereutrophic upper klamath lake (or, usa) through the annual cyanophyte bloom of aphanizomenon flos-aquae. a pore-water profiler was designed and fabricated to obtain the first high-resolution (centimeter-scale) estimates of the vertical concentration gradients of macro- and micronutrients for diffusive-flux determinations. a consistently positive benthic flux for soluble reactive p ... | 2009 | 18980391 |
| assessing potential health risks from microcystin toxins in blue-green algae dietary supplements. | the presence of blue-green algae (bga) toxins in surface waters used for drinking water sources and recreation is receiving increasing attention around the world as a public health concern. however, potential risks from exposure to these toxins in contaminated health food products that contain bga have been largely ignored. bga products are commonly consumed in the united states, canada, and europe for their putative beneficial effects, including increased energy and elevated mood. many of these ... | 2000 | 10811570 |