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10 BIOLOGY AND MEDICINE This animated film offers an explanation of nuclear fission, the chain reaction, and the control of this reaction in three basic types of reac- tors. It describes the principles of fast and thermal reactors and intro- duces the concepts of the moderator and reflector. The breeder prin- ciple is described, and plutonium and thorium cycles are indicated. (This film can be used as a companion to "Basic Principles of Power Reactors.") PROPERTIES OF RADIATION (Understanding the Atom Series) . . See page 59 RADIATION AND MATTER (Understanding the Atom Series) . . . See page 60 SEARCHING FOR. THE ULTIMATE (Challenge Series) See page 52 UNLOCKING THE ATOM (1950). 20 minutes, black and white. Produced by, and for sale by, United World Films, at $120.00 per print, including shipping case. NOT cleared for television. Primarily for junior- and senior-high-school audiences, this film ex- plains the principles that govern the atom and its uses. It describes: chain reaction; atomic structure; properties of alpha, beta, and gamma rays; cyclotrons; and contributions of various scientists. BIOLOGY AND MEDICINE THE ART OF SEPARATION (Challenge Series) .... See page 49 THE ATOM AND BIOLOGICAL SCIENCE (1953). 12 minutes, black and white. Produced by, and for sale by, Encyclopaedia Britannica Films, at $62.15 per print, including shipping case. NOT cleared for television. This is a technical film for intermediate through college-level audi- ences. It identifies and illustrates uses of radioactivity in several areas of biology; effects of radiation on growth and heredity of plants and animals; tracer studies; photosynthesis studies; and measures to protect the investigating scientists. THE ATOM AND THE DOCTOR (Magic of the Atom Series) .... See page 53 THE ATOM IN THE HOSPITAL (Magic of the Atom Series) .... See page 53