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The image of Mastogloia ( right ) only shows the illuminated surface whereas in transmitted light or phase contrast one can see the two elongated chambers which run along the sides of the frustule , one each side . For the first time in the history of physiological chemistry , an enzyme , one of those chemical substances important in the processes of digestion and fermentation , has actually been observed at work , and experimental proof has been provided for the theory that enzymes enter into chemical reactions , as well as stimulate them . The Eagle Creek trail is a great walk , one we heard about from so many PCT through hikers who may not be as lucky as those of us who count it among our local favorites . Programs are flexible , but a typical schedule is as follows : a student normally enrolls in three seminars or courses in each term of the first year of graduate study ; in the first term , one of these must be HIS 500 , Introduction to the Professional Study of History . Reversibility is still a major criterion of good conservation treatment , one that sets conservators apart from skilled restorers or repairers .