The complex structure of higher plant chloroplasts has fascinated researchers for many years. Although the spatial relationship between granum and stroma thylakoids has been known for more than 20 years, most textbooks and research papers continue to include erroneous 3D models and simplified schemes.
Watch its colors change in sunlight! This snazzy white T-shirt has a black outline of the ICE structure on the front and a smiling sun on the back.
Step into the sun, and the designs become bright shades of blue, purple, yellow and orange!
UV active dyes in the shirt are colorless in room light, but become brightly colored in sunlight. Don't forget to indicate the size on the order form! T-shirt, child sizes Order No. Click on the picture for a larger version. Model of ice built with the Polyhedral Model Kit.
The Polyhedral Model Kit simplifies visualization of many complex chemical structures that involve polyhedral shapes.
It can be used to make many structures that would commonly be discussed in science and engineering courses such as inorganic and solid-state chemistry, chemical engineering, geology, industrial chemistry, environmental science, materials science, soil science, and physics.
The kit provides an alternative view of how structural components fit together that cannot be represented by ball-and-stick or space-filling models. Because structures are built with tetrahedral and octahedral units instead of individual atoms, models can be assembled quickly.
Since students focus on units larger than atoms, they can more readily visualize and comprehend complicated structures. Each kit gives different insights into molecular structures, an important pedagogical objective; together they can induce real comprehension into structure—property relationships.
More information about the Polyhedral Model Kit and directions for assembling the more than 40 structures that can be built with it—such as NaCl, ZnS, H2O srutile, perovskites, gibbsite, talc, muscovite, and quartz—can be found at http: Polyhedral Model Kit Order No. Unit Cell as a Cube.
Salt is a pre-built polyhedral model for demonstrating the crystal structure of sodium chloride salt using octahedral units from the Polyhedral Model Kit.
The Polyhedral Model Kit provides an alternative view of how structural components fit together that cannot be represented by ball-and-stick or space-filling models. Most simple inorganic compounds consist of ions that alternate indefinitely rather than existing as discrete molecules in the solid state.
Although the formula NaCl shows a one to one ratio of ions, a salt crystal does not consist of just one sodium ion and just one chloride ion. Rather, in NaCl each sodium ion is surrounded by an octahedron of chloride ions and each chloride ion is surrounded by an octahedron of sodium ions in an extended structure.
The Salt model comes in three layers that can easily be stacked one atop the other to form a NaCl unit cell.
If the layers are connected, the model can be used in two orientations: When the model is resting on one face of the cube, the cubic shape of the unit cell is evident. When the model is balanced on a single octahedron, the closest-packed layers are evident.AET Internal Combustion Engine Theory and Servicing.
This is a theory/laboratory course designed to introduce the student to basic heat engine types, their . Type or paste a DOI name into the text box. Click Go. Your browser will take you to a Web page (URL) associated with that DOI name.
Send questions or comments to doi. You can simulate Rosalind Franklin's famous X-ray diffraction experiments that led to the discovery of the DNA double helix. All you need is a visible laser and two-dimensional diffraction pattern transparencies from the DNA Optical Transform Kit..
Note, as of January . Please click the title of symposia to see their confirmed invited speakers. S1: Electronic Material. Type or paste a DOI name into the text box.
Click Go. Your browser will take you to a Web page (URL) associated with that DOI name. Send questions or comments to doi. BITSAT Entrance Exam The Birla Institute of Technology and Science (BITS) Pilani is an all India Institution declared as Deemed to be University under Section 3 of the UGC Act.