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And finally , the cost of tuition is increasingly becoming a factor in students ’ decisions to attend Penn State . Tonight I 'm so blah that I listlessly look through the songbook , and ca n't even get interested in participating . She has contributed immeasurably to the establishment of a procedurally sound process , participating in and contributing to nearly two dozen promotion and tenure workshops each year and answering daily questions about the process from deans , department heads , committee chairs and individual faculty members . The fact that usually only D-sugars and L-amino acids are found in natural biological macromolecules certainly could be used as an argument for intelligent design because currently there is no scientific understanding as to why that should be the case . L-sugars and D-amino acids certainly exist in nature as free molecules and as the products of racemization of their respective enantiomeric partners in proteins and carbohydrates , and D-amino acids have even been found to have a role in normal brain function , but in general it is true that D-sugars and L-amino acids are the norm . Of the five associations that branch out from ACE , we work most closely with the Association of American Universities ( AAU ) , which represents the nation ’ s leading research universities and the National Association of State Colleges and Land Grant Universities ( NASULGC ) , where our land grant interests are at the forefront .