Judul: Sintesis N-lauroiletanolamida sebagai Inhibitor Korosi dengan Teknik Polarisasi Potensiodinamik
Abstrak: N-Lauroiletanolamida adalah senyawa yang berpotensi sebagai inhibitor korosi karena memiliki gugus fungsi C=O, OH, dan NH. Dalam penelitian ini, N-lauroiletanolamida disintesis melalui 2 tahap, yakni esterifikasi asam laurat dengan alkohol menngunakan asam kuat sebagai katalis dan amidasi dengan etanolamina (MEA). Tahap amidasi menggunakan 2 katalis, yaitu NaOMe dan NaOEt. Keberhasilan sintesis N-lauroiletanolamida dipantau dengan spektrofotometer inframerah dan indikator nilai bilangan asam lemak bebas dan ester. Produk sintesis berkataliskan NaOMe menghasilkan rendemen lebih tinggi, yaitu 78% daripada dengan katalis NaOEt (57%). Kinerja inhibitor korosi diuji pada ragam kosentrasi 50, 100, 200, 400, dan 500 ppm didapatkan % efektivitas inhibisi terbesar dari produk dengan katalis NaOMe dan NaOEt berturut-turut adalah 69% dan 61% pada konsentrasi 500 ppm. N-lauroiletanolamida hasil sintesis terbukti dapat berfungsi sebagai inhibitor korosi dengan menurunkan arus dan laju korosi pada logam Fe.
Keyword: amidasi, efektivitas inhibisi, inhibitor korosi, N-lauroiletanolamida

Judul: Sintesis N-Oleoiletanolamida dan Uji Kinerjanya sebagai Inhibitor Korosi dengan Teknik Polarisasi Potensiodinamik
Abstrak: N-oleoiletanolamida dapat digunakan sebagai inhibitor korosi. Inhibitor ini disintesis melalui esterifikasi asam oleat dengan metanol lalu amidasi metil oleat dengan monoetanolamina. Asam oleat diamidasi dengan dua jenis katalis, yaitu NaOMe dan NaOEt, menghasilkan rendemen berturut-turut 82.9% dan 75.8%. Hasil amidasi kemudian dicirikan gugus fungsinya berdasarkan spektrum inframerah, untuk mengidentifikasi adanya gugus amida hasil konversi ester oleat dan N-oleoiletanolamida. Kinerja inhibitor korosi diuji dengan teknik polarisasi potensiodinamik menggunakan tiga jenis konsentrasi, yaitu 50, 100, dan 200 ppm terhadap elektrode kerja baja karbon. Hasil pengukuran menunjukkan bahwa N-oleoiletanolamida dengan katalis NaOMe dan NaOEt memiliki efektivitas inhibitor berturut-turut 64.4% dan 58.7%.
Keyword: metil oleat, N-oleoiletanolamida, inhibitor korosi, polarisasi potensiodinamik, 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