| 摘要 |
PROBLEM TO BE SOLVED: To fix even a thin concentration sample in an aqueous solution firmly to a substrate under a substantially natural state by employing a fixing substrate on which a single molecule film of an organic compound having a hydrophilic group and a hydrophobic group is formed previously. SOLUTION: An LB film is formed such that a hydrophilic group and a hydrophobic group or a functional group reactive to a fixing agent covers the surface of a fixing substrate 3. When the substrate 3 is immersed into a sample solution 6 containing a fixing agent, cells and microorganisms having relatively large size in a suspensible sample precipitates naturally and fixed chemically on the substrate 3. When the size or the specific gravity is low or when a trace sample is employed, a physical action is imparted. More specifically, a field is applied between the solution 6 and the substrate 3 when a positively or negatively charged material is employed as a sample and a magnet or an electromagnet is disposed under the substrate 3 when the sample is magnetized or reacts to magnetism. Consequently, even a suspensible thin sample can be fixed firmly through natural precipitation or further application of electric or magnetic field.
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