1999 UNAM strike council of the university, which includes faculty and students, modified the proposal to make the tuition increase voluntary. Barnés declared that the conscience of each student would dictate who would pay increased tuition and who would not. Strikers grew increasingly belligerent and had violent altercations with students who were still attempting to enter the campus to try to resume classes. Meanwhile, UNAM issued multiple warrants against strikers who were accused of stealing computers, vehicles and earthquake monitoring equipment. The strikers took advantage of the situation to resist additional graduation requirements such as tougher examinations and time limits for graduation. When
School of Chemistry, UNAM while two more external campuses are also part of the School, the External Complex of Tacuba (Conjunto Externo de Tacuba), in Tacuba, west Mexico City, and the Sisal Foreign Station (Estación Foránea de Sisal), in Sisal, Mérida, Yucatan, south-east Mexico. The institution also offers graduate level studies (Master and Doctorate) in diverse areas: In addition, the School offers several Lifelong Learning programs as well as a wide range of training certificates. The UNAM also has the Institute of Chemistry (Instituto de Química). In the early 20th century, the mexican industry was strongly focused on beer brewing, mining, sugar processing, fabric