**1. Introduction**

With the advent of nanotechnology, researchers started almost simultaneously the use of nanophysics in medical industry and life sciences. The extreme and device-specific physicochemical properties and comparable molecular size scales of 'nanoproducts' had initiated a wide range of efforts searching useful applications and utilizations of the whole objects of macromolecules, systems and organisms. On the other hand, very rapid development in the field of fabrication technologies is introduced into the area of manufacturing with tailored properties. Different thin-film technologies enable the growth of coherent mono- or multilayer composite films with quite large surface areas. The possible utilizations and applications of different kind of thin-film structures in life sciences will be shortly discussed.

Nanotechnology is the study of extremely small structures, having size of 0.1–100 nm. The prefix 'nano' is a Greek word which means 'dwarf'. The word 'nano' means very small or miniature size in real life. These materials should show/ represent different properties, e.g. chemical reactivity, magnetic and optoelectronical effects, conductance, mechanical and plastic properties, etc. As a result of their small size, the **bulk** and **surface** properties are strictly different. But the most important property for us is their **biocompatibility**.
