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# Einzellier im Heuaufguss To observe single-celled organisms, a sample of water from a pond, rain barrel, or aquarium can be examined under a microscope. A large number of these organisms can be cultured in a process called a "Heuaufguss" (hay infusion). **Method:** 1. Fill a glass jar with ap...

# Einzellier im Heuaufguss To observe single-celled organisms, a sample of water from a pond, rain barrel, or aquarium can be examined under a microscope. A large number of these organisms can be cultured in a process called a "Heuaufguss" (hay infusion). **Method:** 1. Fill a glass jar with approximately 2-3 grams of chopped hay and water from a pond or a rain barrel. 2. Leave a 5 cm gap between the water surface and the rim of the jar. 3. Cover the jar with a glass lid to prevent air from entering the jar. 4. Place the jar in a warm setting. 5. Observe changes after a couple of days and examine using a microscope. **Single Cells and Their Characteristics:** A whitish, slimy layer (Kahmhaut) will form on the surface due to the presence of bacteria and fungi. These microorganisms feed on the hay, which serves as food. * **Pantoffeltierchen (Ciliates):** Describe shape, internal structure, and movement. Observe the movement under high magnification after adding a gelatin drop. * **Amöbe:** A single cell organism which changes shape. * **Glockentierchen:** A specific single-celled organism. * **Waffentierchen:** A single-celled organism. * **Flussgeißeltierchen:** Another single-celled organism. * **Tonnentierchen:** A single-celled organism. * **Augentierchen:** A single-celled organism. * **Heutierchen:** A single-celled organism. * **Nasentierchen:** A special kind of single-celled organism. * **Trompetentierchen:** A specific single-celled organism. **Important Notes:** Single-celled organisms perform similar fundamental life functions as multicellular animals (such as moving, nutrition, growth, and reproduction).