High methane ebullition throughout one year in a regulated central European stream.

Ebullition transports large amounts of the potent greenhouse gas methane (CH ) from aquatic sediments to the atmosphere. River beds are a main source of biogenic CH , but emission estimates and the relative contribution of ebullition as a transport pathway are poorly constrained. This study meets a need for more direct measurements with a whole-year data set on CH ebullition from a small stream in southern Germany.

Communicative participation with public authorities: Experiences of people with aphasia, people who stutter, and employees of public authorities.

Introduction: Several studies have examined the communicative participation of people with communication disorders (PWCD). Hindering and facilitating factors were analyzed in different population groups considering various private and public communication contexts. However, knowledge about (a) the experiences of persons with different communication disorders, (b) communication with public authorities, and (c) the perspective of communication partners in this area remains limited.

Impact of Interest Congruence on Study Outcomes.

Grounding on Holland's RIASEC model of vocational interests and the respective assumptions on person-environment fit (congruence), this paper focuses on how congruence is related to study outcomes, especially students' persistence, performance, and satisfaction. The paper distinguishes the measure of congruence with respect to social congruence (SOC) (interest fit with the study mates) and aspirational congruence (ASP) (interest fit with the occupation aspired) and also distinguishes the effects of congruence for gender and six different study areas including Science, Technology, Engineering, Mathematics (STEM), medicine, economics, education, and languages. The paper analyses 10,226 university freshmen of the German National Educational Panel Study (NEPS) and follows them longitudinally with respect to their study outcomes.

Strategies to Overcome Intermediate Accumulation During Nitrate Remediation in Groundwater by Hydrogenotrophic Denitrification.

Bioremediation of polluted groundwater is one of the most difficult actions in environmental science. Nonetheless, the clean-up of nitrate polluted groundwater may become increasingly important as nitrate concentrations frequently exceed the EU drinking water limit of 50 mg L, largely due to intensification of agriculture and food production. Denitrifiers are natural catalysts that can reduce increasing nitrogen loading of aquatic ecosystems.

Dechloromonas and close relatives prevail during hydrogenotrophic denitrification in stimulated microcosms with oxic aquifer material.

Globally occurring nitrate pollution in groundwater is harming the environment and human health. In situ hydrogen addition to stimulate denitrification has been proposed as a remediation strategy. However, observed nitrite accumulation and incomplete denitrification are severe drawbacks that possibly stem from the specific microbial community composition.

Effect of different carbon substrates on nitrate stable isotope fractionation during microbial denitrification.

In batch experiments, we studied the isotope fractionation in N and O of dissolved nitrate during dentrification. Denitrifying strains Thauera aromatica and "Aromatoleum aromaticum strain EbN1" were grown under strictly anaerobic conditions with acetate, benzoate, and toluene as carbon sources. (18)O-labeled water and (18)O-labeled nitrite were added to the microcosm experiments to study the effect of putative backward reactions of nitrite to nitrate on the stable isotope fractionation.