What is the total grant amount of the organizations described as research?
SELECT sum ( grant_amount )  FROM Grants AS T1 JOIN Organisations AS T2 ON T1.organisation_id   =   T2.organisation_id JOIN organisation_Types AS T3 ON T2.organisation_type   =   T3.organisation_type WHERE T3.organisation_type_description   =   'Research'
total grant amount refers to SUM(grant_amount); organizations described as research refers to organisation_type_description = 'Research';