New Blogs #12

Wednesday, November 25, 2009

A bit more than four hands full of new blogs in the four months since New Blogs #11. Importantly, I have disabled the Accelrys blog in favor if the blogs of its individual contributors, Dana, George, Gerhard, Max, Nancy and Shikna. This is not to boost the number of blogs, but merely reflects that Cb focuses on personal (accountable) opinions and not corporate blog (which is often polluted with to much advertisement).

• Post Tenebras Lux (entry in Cb)
• OpenTox Blog (entry in Cb)
• Chemie-Information-Computer (entry in Cb)
• Dana Honeycutt, Ph.D. (entry in Cb)
• George Fitzgerald, PhD (entry in Cb)
• Gerhard Goldbeck-Wood, PhD (entry in Cb)
• Max Petersen, Ph.D. (entry in Cb)
• Nancy Miller Latimer, M.S. (entry in Cb)
• Shikha Varma O’Brien (entry in Cb)
• Mat Todd's Organic Chemistry Blog (entry in Cb)
• Chemiotics II (entry in Cb)
• Semantic Science (entry in Cb)
• All Things Metathesis (entry in Cb)
• Blog of V.Ganesh (entry in Cb)
• Cheminformatics Footprints (entry in Cb)
• Beautiful Photochemistry (entry in Cb)
• Naturalproductman's Blog (entry in Cb)
• Chemical Crystallinity (entry in Cb)
• Chiral Jones (entry in Cb)
• Experimental Error (entry in Cb)
• Mad Chemist Chick (entry in Cb)
• Syntheticnature (entry in Cb)

Happy reading!

Would you be annoyed to see some Google Ads?

Tuesday, November 10, 2009

Would you object to seeing Google Adsense ads on the Cb website? The money it would bring up would be donated to a charity involved in promoting Open Science. Please let us know, either as comment on this blog item or by email.

Looking forward to hearing from you!

for nano technology

Thursday, October 8, 2009

Crystal structure.In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. A crystal structure is composed of a motif, a set of atoms arranged in a particular way, and a lattice. Motifs are located upon the points of a lattice, which is an array of points repeating periodically in three dimensions. The points can be thought of as forming identical tiny boxes, called unit cells, that fill the space of the lattice. The lengths of the edges of a unit cell and the angles between them are called the lattice parameters. The symmetry properties of the crystal are embodied in its space group. A crystal's structure and symmetry play a role in determining many of its properties, such as cleavage, electronic band structure, and optical properties.

Unit cell.The crystal structure of a material or the arrangement of atoms in a crystal structure can be described in terms of its unit cell. The unit cell is a tiny box containing one or more motifs, a spatial arrangement of atoms. The units cells stacked in three-dimensional space describes the bulk arrangement of atoms of the crystal. The unit cell is given by its lattice parameters, the length of the cell edges and the angles between them, while the positions of the atoms inside the unit cell are described by the set of atomic positions (xi,yi,zi) measured from a lattice point.Although there are an infinite number of ways to specify a unit cell, for each crystal structure there is a conventional unit cell, which is chosen to display the full symmetry of the crystal (see below). However, the conventional unit cell is not always the smallest possible choice. A primitive unit cell of a particular crystal structure is the smallest possible volume one can construct with the arrangement of atoms in the crystal such that, when stacked, completely fills the space. This primitive unit cell does not always display all the symmetries inherent in the crystal. A Wigner-Seitz cell is a particular kind of primitive cell which has the same symmetry as the lattice. In a unit cell each atom has an identical environment when stacked in 3 dimensional space. In a primitive cell, each atom may not have the same environment.

New Blogs #11

Friday, July 31, 2009

Not that the last two weeks has seen a boost on blog submissions to Chemical blogspace; just that I was not really finished with New Blogs #10.

• The Realm of Organic Synthesis (entry in Cb)
• Carbon Chemistry (entry in Cb)
• OChemOnline (entry in Cb)
• polymer processing (entry in Cb)
• Metallome (entry in Cb)
• BKBlog (entry in Cb)
• Sam's notes (entry in Cb)
• Zusammen (entry in Cb)
• Kashthealien's Blog (entry in Cb)
• Chemjobber (entry in Cb)
• Henry Rzepa (entry in Cb)
• ChemCafé (entry in Cb)
• Phosphorus carbide (entry in Cb)
• Molecular Modeling Basics (entry in Cb)
• /chemical/structure Blog (entry in Cb)
• Indiana University Cheminformatics News (entry in Cb)
• Accelrys | Blog (entry in Cb)

Happy reading!

New Blogs #10

Thursday, July 23, 2009

Many new blogs have appeared in Chemical blogspace since New Blogs #9. I should really make these overviews more often (I left out the new blogs which have not blogged in 2009 yet):

• Graphene Literature Reviews (entry in Cb)
• RajcaLab Weblog (entry in Cb)
• Making Graphite Work (entry in Cb)
• infiniflux! (entry in Cb)
• PMGB (entry in Cb)
• The road less travelled (entry in Cb)
• PaulingBlog (entry in Cb)
• InkSpot. Science. On Demand (entry in Cb)
• kilomentor (entry in Cb)
• Chemistry in silico (entry in Cb)
• So much to do, so little time (entry in Cb)
• Der Molekülblog (entry in Cb)
• Selenocisteïna (entry in Cb)
• ChEMBL (entry in Cb)
• A Chemistry Question, Daily (entry in Cb)
• Macromolecular Modeling Blog (entry in Cb)
• Practical Fragments (entry in Cb)
• Bridgehead Carbons (entry in Cb)