scholarly journals The War of the Worlds and antibiotic resistance: a case study for science teaching

2015 ◽  
Vol 37 (6) ◽  
pp. 26-28
Author(s):  
Elena Riva
Keyword(s):  
New York ◽  
Ultrafast Lasers ◽  
Adhesive Properties ◽  
Temporal Behaviour ◽  
Chain Polymer ◽  
X Ray ◽  
X Ray Crystallography ◽  
Star Wars ◽  
Solid Objects

What is the web with which Spiderman swings, slides and jumps through the streets of New York City if not a long-chain polymer molecule, similar to nylon, that in contact with air knits and forms an extremely tough, flexible fibre with extraordinary adhesive properties? Did you know that the ultrafast lasers utilized for ‘capturing’ the temporal behaviour of chemical and biological reactions are similar to the ones with which every spaceship involved in Star Wars was equipped? Have you ever thought that Superman's ‘X-ray eyesight’ that allows him to see through solid objects works on the same principle of the X-ray crystallography that allows chemists, physicists and biologists to ‘see’ molecules and proteins?

Atom Assignment in Solid-State Structures on the Basis of X-ray Crystallography and DFT Calculations – A Case Study on a Molecular Cu–Sb Alloy

2006 ◽  
Vol 2006 (6) ◽  
pp. 1127-1129 ◽  
Author(s):  
Reinhart Ahlrichs ◽  
Dieter Fenske ◽  
Alexander Rothenberger ◽  
Claudia Schrodt ◽  
Stephan Wieber
Keyword(s):  
Solid State ◽  
Dft Calculations ◽  
X Ray ◽  
X Ray Crystallography ◽  
Solid State Structures

Optimization of the energy constant of the methionine Sδ—C∊bond forX-PLORrefinement of protein structure

2001 ◽  
Vol 34 (1) ◽  
pp. 80-81 ◽  
Author(s):  
Mamiko Odoko ◽  
Min Yao ◽  
Eiki Yamashita ◽  
Ryosuke Nakashima ◽  
Kunio Hirata ◽  
...  
Keyword(s):  
New York ◽  
Protein Structure ◽  
Bond Energy ◽  
Structure Refinement ◽  
Energy Parameter ◽  
New York University ◽  
Energy Constant ◽  
X Ray ◽  
Bond Lengths ◽  
X Ray Crystallography

The bond energy constant of methionine Sδ—C∊, 170.066 kcal mol−1 Å−2, is given as a default value in X-ray protein structure refinement withX-PLOR[Brünger (1992).X-PLOR Version 3.1. A system for X-ray Crystallography and NMR. New York University Press]. When the atomic parameters of 3564 amino acid residues of bovine heart cytochromecoxidase were refined at 2.0 Å resolution by usingX-PLORwith default restraining parameters, 36 bond lengths deviated by over 0.06 Å from their ideal values. Out of the 36 bonds, 25 were methionine Sδ—C∊bonds. Refinement with an energy parameter of 500.0 kcal mol−1 Å−2for the methionine Sδ—C∊bond resulted in convergence of the Sδ—C∊bond lengths to within 0.06 Å from their ideal values and reduced the crystallographicRand free-Rfactors by 0.6 and 0.3%, respectively. Consequently, a strong bond energy constant for Sδ—C∊of 500.0 kcal mol−1 Å−2is recommended instead of the default value of 170.066 kcal mol−1 Å−2.

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