Packet 2: Bonus 6
Cambridge University runs CCDC and ICSD, two of the largest repositories for this file format, distinguished by whether they report data for organic or inorganic compounds. For 10 points each:
[10h] Name this file format containing atomic coordinates and refinement cycle data. An extension of this format prefixed “macromolecular” is used instead of PDBx as the standard text format of the Protein Data Bank.
ANSWER: CIF (“siff”) files [accept mmCIF files; accept, but DO NOT REVEAL, crystallographic information files or crystallographic information formats or macromolecular crystallographic information files]
[10e] CIFs report structures found via this technique, in which a scattering pattern of a powder or crystalline sample is collected and used to determine the structure’s atomic spacings.
ANSWER: X-ray diffraction [or X-ray crystallography; accept single crystal X-ray diffraction or powder X-ray diffraction; accept XRD or XRC]
[10m] CIFs typically include data about a crystal’s space group, a set of 230 symmetry groups constructed by combining the 32 crystallographic point groups with a set of 14 symmetry groups named for this French physicist.
ANSWER: Auguste Bravais [accept Bravais lattices or Bravais classes or Bravais flocks]
<Editors, Chemistry> | K. Playoffs 2 (Editors 2)
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 24 | 13.33 | 88% | 42% | 4% |
Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Brown | Purdue | 0 | 10 | 10 | 20 | EM |
| Bruin | Stanford B | 0 | 0 | 0 | 0 | |
| Chicago A | Maryland A | 0 | 10 | 0 | 10 | E |
| Chicago B | Northwestern B | 0 | 10 | 10 | 20 | EM |
| Georgetown | Cornell | 0 | 10 | 0 | 10 | E |
| Georgia Tech A | NYU B | 0 | 10 | 10 | 20 | EM |
| Georgia Tech B | Columbia B | 0 | 10 | 0 | 10 | E |
| Georgia Tech C | Cambridge | 0 | 10 | 0 | 10 | E |
| Harvard | Columbia A | 0 | 10 | 10 | 20 | EM |
| Johns Hopkins | Penn State | 10 | 10 | 10 | 30 | HEM |
| MIT | Minnesota | 0 | 10 | 10 | 20 | EM |
| Maryland B | Waterloo | 0 | 10 | 0 | 10 | E |
| Michigan | Virginia | 0 | 10 | 0 | 10 | E |
| NYU A | Virginia Tech | 0 | 0 | 0 | 0 | |
| North Carolina | Illinois B | 0 | 10 | 0 | 10 | E |
| Rutgers | Ohio State | 0 | 10 | 0 | 10 | E |
| Stanford A | UC Berkeley B | 0 | 10 | 10 | 20 | EM |
| Swarthmore | UCF | 0 | 0 | 0 | 0 | |
| Texas | British Columbia | 0 | 10 | 0 | 10 | E |
| Toronto A | Indiana | 0 | 10 | 10 | 20 | EM |
| Toronto B | Vanderbilt | 0 | 10 | 10 | 20 | EM |
| UC Berkeley A | Northwestern A | 0 | 10 | 10 | 20 | EM |
| UCLA | Illinois A | 0 | 10 | 0 | 10 | E |
| WashU | Pittsburgh | 0 | 10 | 0 | 10 | E |
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| Main Site | 2026-04-17 | ✓ | 24 | 13.33 | 88% | 42% | 4% |