Related Experiment Video
Updated: Jul 30, 2026

10:49
Estimating Virus Production Rates in Aquatic Systems
Published on: September 22, 2010
[Bacterial numbers of a running water (author's transl)]
Abstract:
Aerobic heterotrophic, pigment-producing lipolytic, coliform bacteria and E. coli were isolated at different sites of a small running water. After villages the bacterial numbers highly increased, whereas they decreased in the self-purification reaches between the villages. Significant differences between the numbers of heterotrophs at adjacent locations were observed. At relatively low polluted sites high correlation coefficients between the numbers of heterotrophs and those of E. coli were found.
Related Concept Videos
States of Water
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
The Water Cycle
The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, the cycling of water is extremely important to ecosystem dynamics.

