| occurrence of dissolved and particle-bound taste and odor compounds in swiss lake waters. | the occurrence of algal taste and odor (t&o) compounds was investigated in three swiss lakes which exhibit different nutrient levels from eutrophic to oligotrophic (lake greifensee, lake zurich and lake lucerne). apart from dissolved t&o compounds, the study also encompassed particle-bound compounds, i.e., compounds that can be released from damaged algal cells during drinking water treatment. a combined instrumental (spme-gc-ms) and sensory method was applied that allowed to detect and quantify ... | 2009 | 19303129 |
| the burgundy-blood phenomenon: a model of buoyancy change explains autumnal waterblooms by planktothrix rubescens in lake zürich. | buoyancy changes of the cyanobacterium planktothrix rubescens- the burgundy-blood alga - were modelled from its buoyancy response to light and irradiance changes in lake zürich during autumnal mixing. the daily insolation received by filaments at fixed depths and circulating to different depths was calculated from the measured light attenuation and surface irradiance. the active mixing depth, za5, was determined from the vertical turbulent diffusion coefficient, kz, calculated from the wind spee ... | 2006 | 16390423 |
| the diversity of gas vesicle genes in planktothrix rubescens from lake zürich. | part of the gas vesicle gene cluster was amplified by pcr from three strains of planktothrix rubescens isolated from lake zürich, switzerland. each contains multiple alternating copies of gvpa and gvpc. all of the gvpa sequences in the different strains are identical. there are two types of gvpc: gvpc20, of length 516 bp, encodes a 20 kda protein of 172 amino acid residues (whose n-terminal amino acid sequence is homologous with the sequence of gvpc in planktothrix [oscillatoria] agardhii); gvpc ... | 1999 | 10537197 |
| stratification by cyanobacteria in lakes: a dynamic buoyancy model indicates size limitations met by planktothrix rubescens filaments. | the ability of the planktothrix rubescens to stratify in lake zürich is related to the size and shape of the cyanobacterial filaments. detailed measurements made in the lake are used in a dynamic computer model of buoyancy regulation to investigate the vertical movements of filaments tracking the depth at which the irradiance would support neutral buoyancy. the movement of the filament lags behind the constantly changing target depth owing to (a) the time taken for the filament to respond to the ... | 2005 | 16219076 |