Judul: Evaluasi Kinerja N-stearoiletanolamida sebagai Inhibitor Korosi dengan Teknik Polarisasi Potensiodinamik
Abstrak: Korosi merupakan suatu fenomena permukaan yang dapat mendegradasi sifat logam. Senyawa organik seperti alkanolamida lemak berpotensi sebagai inhibitor korosi. N-stearoiletanolamida berpotensi sebagai inhibitor korosi karena memiliki gugus amida dan hidroksil yang dapat berinteraksi dengan permukaan logam. Salah satu teknik sintesis N-stearoiletanolamida, yaitu melalui tahap esterifikasi dari asam stearat dengan alkohol dan amidasi dengan etanolamina. Sintesis tahap amidasi dilakukan dengan dua katalis, yaitu NaOMe dan NaOEt. Pengukuran antikorosi dilakukan menggunakan tiga jenis variasi konsentrasi, yaitu 50 ppm, 100 ppm, dan 200 ppm. Hasil pengukuran menunjukkan bahwa Nstearoiletanolamida dengan katalis NaOMe dan NaOEt memiliki efektivitas inhibisi korosi yang hampir sama dengan %EI terbesar pada katalis NaOMe dan NaOEt berturut-turut sebesar 70.99% dan 71.57% dari konsentrasi tertinggi. Berdasarkan rendemen, N-stearoiletanolamida dengan katalis NaOMe memiliki nilai yang lebih besar dibandingkan katalis NaOEt. Hasil rendemen dari katalis NaOMe sebesar 81.84%, sedangkan katalis NaOEt sebesar 73.20%.
Keyword: efektivitas, inhibisi, inhibitor korosi, N-stearoiletanolamida

Judul: Sintesis N-Stearoiletanolamida dan Uji Kinerjanya sebagai Inhibitor Korosi dengan Teknik Polarisasi Potensiodinamik
Abstrak: N-Stearoiletanolamida merupakan senyawa yang dapat berfungsi sebagai surfaktan, deterjen, kosmetik, antiinflamasi pada bidang medis, serta digunakan dalam bahan industri. Fungsi yang dikaji dalam penelitian ini adalah sebagai antikorosi yang diukur menggunakan teknik polarisasi potensiodinamik. NStearoiletanolamida disintesis dari etilstearat dengan monoetanolamina (MEA). N-stearoiletanolamida dibuat menggunkan dua macam katalis, yaitu NaOMe dan NaOEt. Pengukuran antikorosi menggunakan teknik polarisasi potensiodinamik dilakukan dengan tiga macam variasi konsentrasi, yaitu 50 ppm, 100 ppm, dan 200 ppm. Hasil pengukuran menunjukkan bahwa N-Stearoiletanolamida dengan katalis NaOMe memiliki efektivitas inhibisi korosi paling besar dibandingkan dengan N-Stearoiletanolamida dengan katalis NaOEt. Efektivitas inhibisi NStearoiletanolamida dengan katalis NaOMe pada logam Fe mencapai 82% pada konsentrasi larutan inhibitor 200 ppm, sedangkan pada katalis NaOEt hanya mencapai 77% dengan konsentrasi yang sama.
Keyword: efektivitas inhibisi, laju korosi, N-Stearoiletanolamida, NaOMe, NaOEt

Judul: Studies on growth spurt and aging in higher primates
Abstrak: single measurement that best defines the health and nutritional status of children, just as it provides an indirect measurement of the quality of life of an entire population. The pattern of human growth reflects the biocultural evolution of our species. The human pattern of growth and development (ontogeny) appears to differ markedly from patterns of ontogeny in other primate species. Three studies are reported here which deal to the growth and development of human and chimpanzee (Pan troglodytes). These three studies allow us to contrast the phenomena of adolescence growth spurt and female elderly bone loss in chimpanzee and human as chimpanzee is the closest species to humans within extant nonhuman primates. In the first, a cross-sectional study of growth of the body size and somatotype of 363 Javanese girls and 299 Javanese boys aged 4 to 20 years from Magelang Regency, Indonesia was described. In the second, cross-sectional and longitudinal studies in the growth of chimpanzee second metacarpal bone linear dimensions from individuals aged 0 to 43.6 years were used for comparison. While in the third, cross-sectional and longitudinal studies in the growth of chimpanzee body size (body mass and anterior trunk length) and second metacarpal bone mineral content were derived. In measuring the second metacarpal dimensions and mineral content, a total of 568 radiographs of chimpanzee's proximodistal left hands were used. They were taken from 68 females and 49 males aged 0 to 43.62 years old. We applied an image analysis system, Scion Image Release Alpha 4.0.3.2 software for Windows to measure bone linear dimensions and bone mineral content. Humans present complex and sinuous growth curves for both body weight and height. A clear growth spurt could be demonstrated by cross-sectional analysis in our girl subjects at around aged 11.5 years and in our boy subjects at around aged 12.5 years. In longitudinal series, not in cross-sectional, several representative chimpanzees of both sexes showed a pre-adult growth spurt on the body sizes, bone dimensions and bone mineral content. They ranged at age 4.5 to 8.5 years. This underscore the fact that adolescent growth spurt in linear dimension was not a universal feature of anthropoid primate ontogeny. Bone loss is a well established characteristic of human female aging. Based on crosssectional analyses the sequential decline of bone mass in female chimpanzee may be said to be genuine. On the other hand, we found in adulthood through elderly, male chimpanzees show a longer plateau than female chimpanzee, that is, bone mineral content is maintained in male.
Keyword: Javanese children, growth spurt, chimpanzee, second metacarpal bone, bone loss, Higher Primates