Scientific Interest Groups (SIGs)

Scientific Interest Groups (SIGs) are a vital part of the ACA.There are 12 SIGs that each represent a particular discipline within the field of crystallography, allowing members to focus on their area of specialty while retaining access to interaction with the entire range of crystallographic techniques and applications. Any member may join however many SIGs they wish.There are no additional fees association with SIG membership.


SIGs are responsible for defining the program at annual meetings. Each SIG is charged with organizing at least one half-day session every two years. This is a great opportunity for members to get involved in the ACA at a grass roots level and have a direct impact upon the annual meeting.


SIGs schedule an annual meeting during the main meeting. You are welcome to attend any or all meetings.


Schedule of SIG Meetings at the 2017 Meeting

Biological Macromolecules: Sunday, May 28 at 5:00pm

Fiber Diffraction: no meeting

General Interest:  Saturday, May 27 at 12:0pm

Industrial: Saturday, May 27 at 12:00pm

Light Sources: Saturday, May 27 at 12:00pm

Materials, Neutron & Powder: Joint meeting, Sunday, May 28 at 12:00pm

Service & Small Molecule: Joint meeting, Monday, May 29 at 12:00pm

Small Angle Scattering:  

Young Scientists':  Sunday, May 28 at 12:00pm

Canadian Division:  Saturday, May 27 at 12:00pm


All Member Business Meeting:  Monday, May 29 at 5:00pm


SIG Activities & Responsibilities

One officer from each SIG is welcome to attend the planning meeting for the 2018 Annual Meeting. This meeting will be held on Wednesday, May 31, at 8:30am, within the Hyatt Regency Hotel.


A scientific interest group, in addition to any other activity described in their constitution or petition for formation, will organize at least one half-day session every year at an annual meeting. The Program Chair will make assignment of meeting rooms and time blocks for these sessions. Within the time blocks, however, the format may be any that is considered appropriate by the Group. Abstracts for the sessions must appear in the program and abstract book and must conform to the standard regulations made by the Program Chair with respect to format, deadlines, etc. These sessions will be interspersed with the general plenary sessions.


An annual report of the SIG activities should be submitted to the Council one month before the annual meeting.  A representative of the SIG should meet with the Council at the annual meeting. A report of scientific highlights of the year should be submitted to the Council by December 1st, for review and enclosure in the Spring issue of ACA RefleXions newsletter.


The resources of the ACA, such as AIP services, newsletter, etc., will be available to the Group.  As an ACA SIG, the Group will be subjected to the ACA Constitution, Bylaws and Operating Rules.  Proposed changes in the Group's rules, dues, etc., must be approved by the ACA Council.


Click below for information on each SIG:


Biological Macromolecules


Fiber Diffraction

General Interest




Light Sources




Neutron Scattering


Powder Diffraction


Service Crystallography


Small Molecules


Small Angle Scattering


Young Scientists


Canadian Division