Rifaximin is a nonabsorbed (< 0.4%), broad-spectrum antibiotic specific for enteric pathogens of the gastrointestinal tract (ie, gram-positive, gram-negative, aerobic, anaerobic). Rifampin is a structural analogue.
Hawthorne begins The Scarlet Letter with a long introductory essay that generally functions as a preface but , more specifically , accomplishes four significant goals : outlines autobiographical information about the author , describes the conflict between the artistic impulse and the commercial environment , defines the romance novel ( which ...
Cover letters may serve the purpose of trying to catch the reader's interest or persuade the reader of something, or they may simply be an inventory or summary of the documents included along with a discussion of the expected future actions the sender or recipient will take in connection with the documents.