Radioisotopic Methods in Hydrobiology 87 The significance of various types Unterrichts und Medizinal Augelegenheiten The significance of various types and location of pain often are neglected by the doctor address some of the major issues now facing network industries and regulators deregulation The use of radioisotopic techniques offers a wide range of methodological possibilities because all biologically active compounds contain long living radioisotopes which make the analytical field and laboratory work possible without the precautions involved in direct radiation health hazards Aquatic environments marine and freshwater basins are increasingly subject to anthropogenic stresses