FPLC o f crude cell extracts o f Chlorella kessleri reveals tw o protein fractions w ith phos­ phoenolpyruvate carboxylase activity. Their m ole m asses, 955 kD a and 543 kD a, suggest that they are dimer and m onom er o f the same enzym e. Further data, how ever, indicate that they are m ore likely tw o different iso-form s o f phosphoenolpyruvate carboxylase: A ttem pts to in­ terconvert both...

The use of alga biomass for biogas generation has been studied for over fifty years but until today, several distinct features, like inefficient degradation and low C/N ratios, limit the applicability of algal biomass for biogas production in larger scale. In this work we investigated a novel, one-stage combined cultivation/fermentation strategy including inherently progressing nitrogen starvat...

Invasive round goby Neogobius melanostomus and bighead goby Ponticola kessleri have successfully colonized freshwater and coastal habitats worldwide. The objective was to use stable isotope analyses to study the foraging and movement of both species at small spatial scales in the Upper Danube River, considering 861 samples from two different years, seasons and sides of the river in an area wher...

—We estimated the variation in instantaneous rates of growth (G) and mortality (M) between intraannual cohorts of juvenile American shad Alosa sapidissima in the Pamunkey River, Virginia. The ages of juveniles captured by push net during the juvenile abundance index surveys in 1998 and 1999 were estimated by counting daily rings on the sagittal otoliths. Weight-at-age and abundance-at-age data ...