Characteristics of the aqueous environment

In common with all the habitats of living organisms, also the aqueous environment can be characterized by its physical and chemical properties the main aspects are now discussed in some detail. 

Aquatic organisms are mostly exposed to smaller temperature changes than the land organisms. The fact that water in Nature undergoes much smaller temperature deviations than the air is primarily due to specific physical properties of water (anomalies see Section 3.2). 

One crucially important factor for aquatic life in large enclosed areas of water such as lakes or reservoirs is that they do not freeze to the bottom, particularly because of the anomalous changes in the density of water when its temperature approaches zero. 

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Changes in the polymer concentration had no significant effect on the fluorescence behavior therefore, the transition was an intramolecular rather than an intermolecular phenomenon. In contrast to the butyl copolymer, the dansylated methyl copolymer, whose fluorescence is also shown in Figure 3, undergoes no transition its fluorescence is essentially constant over the whole ionization range. The low value is characteristic of the aqueous environment that the probe experiences in the random coil conformation. 

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