digestive title pakpahan manurung binari outcome education 196404041989031006 4103342019 sidikalang 19642311990031018 science 2013 biology student learning program sipahutar nat tri dr academic UNIMED dean FMIPA martalena SMA date system worksheet examination rer study supervisor 196106261987101001 2014 SID harsono clas acknowledged based thesi herbert department image human prof XI name NIP head coordinator approved 195908051986011001 effect year bilingual september motlan