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Bacteria-induced mixing in natural waters

Publications associées (46)

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Nutrient cycling in Lake Kivu

Alfred Johny Wüest, Martin Schmid

This chapter summarizes the knowledge on mixing and transport processes in Lake Kivu. Seasonal mixing, which varies in intensity from year to year, influences the top ∼65 m. Below, the lake is permanently stratified, with density increasing stepwise from ∼ ...

Springer2012

Stratification, mixing and transport processes in Lake Kivu

Alfred Johny Wüest, Martin Schmid

This chapter summarizes the knowledge on mixing and transport processes in Lake Kivu. Seasonal mixing, which varies in intensity from year to year, influences the top â¼65 m. Below, the lake is permanently stratified, with density increasing stepwise from ...

Springer2012

Development of the MicroThrust Breadboard: A Miniaturized Electric Propulsion System for Nanosatellites

Herbert Shea, Caglar Ataman, Muriel Richard

Since 2008, the MicroThrust (MT) consortium consisting of EPFL, Nanospace, QMUL, SystematIC, and TNO has been working on the development of a MEMS based electric propulsion system. Since 2010, the work has been performed as part of the European Union’s FP7 ...

2012

Hyporheic flow under periodic bed forms influenced by low-density gradients

David Andrew Barry

Small density variations due to low solute concentrations in the stream water commonly exist in streams and rivers. Using laboratory experiments and numerical modeling, we demonstrated that even such small density variations could influence the hyporheic f ...

American Geophysical Union2011

Double-diffusive convection in Lake Kivu

Alfred Johny Wüest, Martin Schmid

Double-diffusive staircases with a total of 230-350 mixed layers and sharp interfaces were observed in nine microstructure temperature profiles measured during February 2004 in Lake Kivu. The presence of these staircases at depths. 120 m indicates that dia ...

Amer Soc Limnology Oceanography2010

Integration of Sub-Wavelength Nanofluidics on Suspended Photonic Crystal Sensors

Hatice Altug, Min Huang

In this paper, we introduce a novel sensor scheme which merges nano-photonics and nano-fluidics on a single platform through the use of free-standing photonic crystals (PhCs). PhCs offer great freedom to manipulate the spatial extent and the spectral chara ...

SPIE-INT SOC OPTICAL ENGINEERING2010

Development of MEMS based Electric Propulsion

Herbert Shea

In recent years, there has been a large increase in the number of small satellites being designed, built and launched. Due to resource constraints, these spacecraft have not generally included any propulsion capability, and this has severely limited missio ...

2010

Occurrence of microcystin-producing cyanobacteria in Ugandan freshwater habitats

Cyril Portmann, Karl Gademann

Microcystins (MCs) are cyclic heptapeptides, which are the most abundant toxins produced by cyanobacteria in freshwater. The phytoplankton of many freshwater lakes in Eastern Africa is dominated by cyanobacteria. Less is known, however, on the occurrence o ...

2010

Do Microscopic Organisms Feel Turbulent Flows?

Alfred Johny Wüest, Miki Hondzo

Microscopic organisms in aquatic environments are continuously exposed to a variety of physical and chemical conditions. Traditionally, it is accepted that due to their small size the physiology of microscopic organisms is not affected by the moving fluid ...

Amer Chemical Soc2009

Occurrence of dissolved and particle-bound taste and odor compounds in Swiss lake waters

Urs von Gunten

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 stu ...

2009