Échantillons
Des spécimens sont disponibles pour une grande variété de procédures de test organiques et inorganiques. Les échantillons organiques peuvent être utilisés pour la dissection ou l’étude de spécimens entiers, vivants ou conservés, avec des exemples pratiques en biologie cellulaire ou dans l’analyse de la structure interne d’organes et de systèmes multicellulaires complexes. Les spécimens de roche permettent l’étude des textures, des tailles de grains et d’autres caractéristiques influencées par la pression, la température et d’autres forces naturelles, offrant un aperçu de l’histoire géologique de la Terre.
Premium Mineral Collection
Premium introductory collection features 12 palm-sized specimens that depict the variety of colors and forms found in minerals. Each specimen is numbered and keyed to an ID sheet featuring additional data about each item. Includes an information booklet and a magnifier.
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Staurolite (Twin)
Classic staurolite crystal twins in schistose matrix with well-defined crystal form. Average size: 2" x 3". Russia.
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Kosmoceras sp. (Jurassic)
Spectacular polished and pyritized ammonite shell showing hollow chamber cross-sections; fine display quality. Average size: 2". Russia.
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Hardwood/Softwood Comparison Riker Mount, Riker Mount
Accompanying Diagrams Detail Growth Rings
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Stem Adaptation Riker Mount
Learn Plant Morphology by Studying Stem Morphology
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Commerical Grains Collection Riker Mount
Riker mount of commerical grains for display.
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Comparison of Leaf Venation Riker Mount
Riker mount of leaf venation comparison for display.
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Ward's® Live Caenorhabditis elegans. culture
Ideal for use as a model system, this free-living nematode has biological processes similar to those of other animals. The transparent animal normally inhabits soil.
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Universal Specific Gravity Kit for an Electronic Scale
The Universal Specific Gravity Kit is designed to be used with any electronic scale with a minimum capacity of 15 grams and a tare (re-zeroing) function to easily measure the specific gravity of gemstones and minerals.
Just weigh the stone "in air" on the integrated weighing platform of the scale, then without changing the setup, weigh the stone in water by placing it in the underwater weighing pan of the gem holder suspended above the platform. Plug the two values into the specific gravity equation and obtain the specific gravity of your stone.
Includes: lightweight gem holder support and underwater weighing pan, independent, spill-resistant, adjustable beaker support, beaker for filling with water - 100ml capacity, aluminum test weight, stainless steel tweezers, instructions, reproducible Specific Gravity worksheet, table of 300 common minerals/gems sorted by SG, with 6 other properties, including refractive index.
Note: shown with Boreal Balance - not included.