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
Mexicans in 1936), were established during the first half of the 20th century. Most of the new research institutes were created within UNAM. Twelve institutes were integrated into UNAM from 1929 to 1973. In 1959, the Mexican Academy of Sciences was created to coordinate scientific efforts between academics. In 1995 the Mexican chemist Mario J. Molina shared the Nobel Prize in Chemistry with Paul J. Crutzen and F. Sherwood Rowland for their work in atmospheric chemistry, particularly concerning the formation and decomposition of ozone. Molina, an alumnus of UNAM, became the first Mexican citizen to win the Nobel Prize in science.