Human activity investigations

This is a case of optically active materials arising from inactive materials. However, it may be argued that an optically active investigator is required to use the tweezers. Perhaps a hypothetical human being constructed entirely of inactive molecules would be unable to tell the difference between left-and right-handed crystals. 

Special optical fibres have been intensively investigated during recent years because of their potential wide-range use for on-line monitoring of material properties or processes in a number of areas of human activity (environment protection, food industry, medicine etc.) Their technology can be considered an integral part of the team-work on optical fibre sensors development. Despite special optical fibres represent a unique and often indispensable tool for a variety of sensor applications, special fibre production still represents only a small fraction of the market. Probably it is because of their low consumption (in comparison with standard telecommunication fibres), the need for much more advanced know-how and lower reproducibility. 

In this context it is natural to consider the potential adaptability of species, as investigated by Karpevich (1976). Knowledge gained in this field is, however, far from satisfactory and we continue to underestimate the ability of species to adapt to extreme conditions. This aspect acquires special significance because of the increasing pollution of water bodies by human activities, so biochemical mechanisms of adaptation must become the object of much future study. 

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