AbstrakLatar belakang: Malondialdehida (MDA) merupakan petanda stres oksidatif yang merupakan produk akhir dari reaksi berantai proksidasi lipid. Untuk mencegah stres oksidatif, tubuh mensintesis katalase, suatu enzim antioksidan endogen yang mengkatalisis hidrogen peroksida (H 2 O 2 ) menjadi air dan oksigen. Sampai saat ini kadar MDA dan katalase pada populasi usia lanjut (usila) masih memberikan hasil yang bervariasi dan kadar tersebut pada kelompok usia yang berbeda dalam populasi usila belum pernah dilaporkan. Dengan demikian, penelitian ini bertujuan untuk menganalisis profil kadar MDA dan aktivitas spesifik katalase pada plasma populasi usila berdasarkan peningkatan usia.Metode: Penelitian ini menggunakan 60 subjek wanita usila sehat yang tinggal di Jakarta. Subjek dibagi dalam 2 kelompok berdasarkan kategori usia, kelompok yang lebih muda (60 -70 tahun) dan kelompok yang lebih tua (> 70 tahun). Kadar MDA dan aktivitas spesifik katalase dianalisis pada plasma dengan spektrofotometer.Hasil: Kadar MDA pada kelompok yang lebih muda (60 -70 tahun) sedikit lebih tinggi dibandingkan kelompok yang lebih tua (> 70 tahun) namun tidak bermakna secara statistik. Selain itu, akitivitas spesifik katalase pada kelompok yang lebih muda lebih rendah bermakna dibandingkan dengan kelompok yang lebih tua. Kesimpulan: Tidak ada perbedaan bermakna kadar MDA plasma pada populasi usila. Namun, aktivitas spesifik katalase meningkat bermakna seiring dengan pertambahan usia. (Health Science Journal of Indonesia 2019;10(2):132-6) AbstractBackground: Malondialdehyde (MDA) is a marker of oxidative stress as an end product from the chain reaction of lipid peroxidation. In order to prevent oxidative stress, our body synthesizes catalase, an endogenous antioxidant enzyme that catalyzes hydrogen peroxide (H 2 O 2 ) into water and oxygen. Until now, the level of MDA and catalase in aging population were still varied and those level at different age in elderly population has not been yet reported. Therefore, the purpose of this study was to analyse the profile of MDA level and catalase specific activity in plasma of elderly women based on increasing age. Methods:This research used 60 healthy elderly women as the subjects living in Jakarta. The subjects were divided into 2 groups based on age category, the younger group (60 -70 years old) and the older group (>70 years old). MDA and specific activity of catalase were analyzed in plasma using spectrophotometer.Results: MDA level in the younger group (60-70 years old) was slightly higher than MDA levels in the older group (>70 years old) but it was not significant. Moreover, specific activity of catalase in the younger group was significantly lower than the older group.Conclusions: There was no difference in MDA level of elderly woman between younger and older group. However, catalase specific activity significantly increased with increasing age.

This study aims to find out: (1) students’ perceptions toward bilingual education in ICP (International Class Program) toward the use of two languages of instructions (English and Indonesian) by the lecturer in classroom. (2) to investigate its benefit for students in ICP chemistry education. The researcher adopted a descriptive qualitative research with a case study method. To gain the data, the researcher employed questionnaire with the students. the subjects in this study were 24 of students sixth semester belong to the International Class Program (ICP) chemistry education in State University of Makassar. The results of this study showed that there were the bilingual education helps the students to gain control their English skill. It showed that students’ positive perceptions toward the use of bilingual language as language instruction in the classroom by the lecturer. It is concluded that teaching chemistry in English facilitates the learners’ attempt in learning English.

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The purpose of this research was to find politeness strategies used by netizens in YouTube comments section based on Najwa Shihab’s YouTube Channel. This research was descriptive qualitative research based on politeness strategies phenomena in written language. Thirteenth strategies found in this research were expressing wish and gratitude, intensifying support and interest, softening request, being pessimistic, giving sympathy, using identity marker, being indirect, showing agreement, face-negative threatening acts, giving questions or asking reason, using impersonal forms, using joke, and giving praise. The data in this research used verbal impressions of netizens comments on Najwa Shihab YouTube Channel period April 2020. This research used the principle of courtesy Brown Levinson to classify and analyze the data according to its category. This research also was found that the obidience of positive face and threaten positive face are more dominant. These kinds of utterance are dominant in netizens comment is influenced by context.