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"ABSTRAKPendahuluan: Paparan bising merupakan hal penting yang perlu diperhatikandampaknya terhadap ambang dengar seseorang yang bekerja di pabrik. Akibatpaparan bising dapat menyebabkan pergeseran ambang dengar yang bersifatsementara maupun menetap. Umumnya akibat paparan bising akan terjadi kerusakansel rambut luar di koklea. Tujuan: Melihat perubahan ambang dengar padapemeriksaan Audiometri maupun SNR (Signal to noise ratio ) pada OAE (OtoAccoustic Emission) akibat paparan bising. Metode: Penelitian ini mengevaluasiambang dengar dan fungsi sel rambut luar koklea pekerja di pabrik Baja pada periodetahun 2017 dan 2018.Data diperoleh dari data pekerja pabrik yang menjalanipemeriksaan Audiometri nada murni dan OAE pada periode tersebut.Penelitiandilakukan dengan metode kohort. Hasil: Jumlah pekerja yang menjalani pemeriksaanAudiometri dan OAE pada tahun 2017 sebanyak 221 orang, sedangkan pada tahun2018 sebanyak 241 orang. Data tersebut diatas hanya bisa dinilai sebanyak 144 orangyang menjalani pemeriksaan pada tahun 2017 dan 2018. Pada evaluasi terdapatperubahan secara signifikan baik pada hasil Audiometri maupun OAE.Oleh karena itudibutuhkan evaluasi yang lebih lama.

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ABSTRACTIntroduction : Exposure to noise is important because makes impact to hearing levelwhose works in factory. This noise exposure can result in temporary threshold shift orpermanent threshold shift. The principle cause of NIHL is damage to cochlear outerhair cells. Purpose : To see the change of hearing level in Audiometric measurementand SNR (signal to noise ratio) in (Oto Accoustic Emission) caused by noiseexposure. Methode : This research evaluated hearing level and fuction of cochlearouter hair cell factory worker in a steel mill periode 2017 until 2018. This data offactory worker collect from data who undergo pure tone Audiometry and OAE at thisperiode. This research done by cohort method.Result: The number of workersundergoing Audiometric and OAE measurement in 2017 was 221 people, while in2018 there were 241 people. The data above can only be assessed as many as 144people undergoing inspection in 2017 and 2018. In evaluation there were significantchanges in both Audiometric and OAE result, therefore a longer evaluation time wasneeded."

"The function of lateral line organ system of jack mackerel (Trachurusjaponicus) was studied through histological observations, for identifying the structure and distribution of lateral line organs both for the head part and body trunk, with the identification of the histological details of pores and hair cells. Histological observations were conducted with a binocular microscope, with three different approaches as haematoxylin, methylene blue and di-4-ASP dye for identifying the structure and distribution of lateral line organs, and then to identify the histological details of pores and hair cells by preparing the sampled tissue for photo-microscopic observations. The results showed that seven canal systems were identified in the head part; such as supra temporal, postoptic, optic, supra orbital, infra orbital, operculum and mandibular canals, with the width ranging 0.9-1.5 mm. Higher density of pore distribution was examined on the nasal and dorsal areas of the head part, which is 7-8 and 5 pores/mm2 respectively. In the other areas of the head part, the density of pores was ranged as 1-2 pores/mm2. Concerning the body trunk, 29 pores of 12-13 pm diameters were identified along the main lateral line. The functions of lateral line organ of jack mackerel are discussed in relation to the swimming behaviour and performance."