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Lens, Crystalline: A transparent, biconvex structure of the Eye, enclosed in a capsule and situated behind the Iris and in front of the vitreous humor (Vitreous body). It is slightly overlapped at its margin by the ciliary processes. Adaptation by the Ciliary body is crucial for Ocular accommodation.
 Science Education: Essentials of Earth Science

Physical Properties Of Minerals I: Crystals and Cleavage

JoVE Science Education

Source: Laboratory of Alan Lester - University of Colorado Boulder

The physical properties of minerals comprise various measurable and discernible attributes, including color, streak, magnetic properties, hardness, crystal growth form, and crystal cleavage. Each of these properties are mineral-specific, and they are fundamentally related to a particular mineral’s chemical make-up and atomic structure. This experiment examines two properties that stem primarily from symmetric repetition of fundamental, structural atomic groupings, called unit cells, within a crystal lattice, a crystal growth form, and crystal cleavage. Crystal growth form is the macroscopic expression of atomic-level symmetry, generated by the natural growth process of adding unit cells (the molecular building blocks of minerals) to a growing crystal lattice. Zones of rapid unit-cell-addition become the edges between the planar surfaces, i.e. faces, of the crystal. It is important to recognize that rocks are aggregates of mineral grains. Most rocks are polymineralic (multiple kinds of mineral grains) but some are effectively monomineralic (composed of a single mineral). Because rocks are combinations of minerals, rocks are not referred to as having crystal form. In some cases, geologists refer to rocks as having a general cleavage, but here the term is simply used

 JoVE Bioengineering

Planar and Three-Dimensional Printing of Conductive Inks

1Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 2Center for Micro- and Nanotechnology, Lawrence Livermore National Laboratory, 3Presently at the Interdisciplinary Center for Wide Band-gap Semiconductors, University Of California Santa Barbara


JoVE 3189

 JoVE Bioengineering

Manufacturing Of Robust Natural Fiber Preforms Utilizing Bacterial Cellulose as Binder

1Polymer and Composite Engineering (PaCE) Group, Institute of Materials Chemistry and Research, University of Vienna, 2Department of Chemical Engineering, University College London, 3Polymer and Composite Engineering (PaCE) Group, Department of Chemical Engineering, Imperial College London


JoVE 51432

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 JoVE Bioengineering

Lignin Down-regulation of Zea mays via dsRNAi and Klason Lignin Analysis

1The School of Plant Sciences, University of Arizona, 2Department of Chemical Engineering and Materials Science, DOE Great Lakes Bioenergy Research Center, Michigan State University, 3The Institute for Sustainable and Renewable Resources, The Institute for Advanced Learning and Research, 4Department of Plant, Soil and Microbial Sciences, Michigan State University


JoVE 51340

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 JoVE Chemistry

Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment

1Empa - Swiss Federal Laboratories for Materials Science and Technology, 2Institute of Chemical and Bioengineering, Department of Chemistry and Applied Bioscience, ETH Zurich, 3ICN2-Institut Catala de Nanociencia i Nanotecnologia, 4WITec GmbH, 5Institut de Ciència de Materials de Barcelona, 6School of Chemistry, The University of Nottingham


JoVE 54193

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