Judul: Sintesis Komposit Fe3O4/Karbon Aktif sebagai Adsorben Biru Metilena dan Jingga Metil.
Abstrak: Zat warna dalam limbah industri dapat diolah dengan adsorpsi menggunakan karbon aktif. Adsorpsi merupakan metode yang mudah dilakukan tetapi membutuhkan waktu yang cukup lama untuk memisahkan adsorben dan adsorbat. Sintesis Fe3O4 dilakukan dengan mencampurkan ion Fe2+, Fe3+, dan OHyang didasarkan pada nisbah mol 1:2:10. Komposit Fe3O4/karbon aktif disintesis menggunakan metode pencampuran fisik dan reaksi kimia untuk mendapatkan material yang memiliki sifat magnet dan adsorben. Hasil percobaan adsoprsi biru metilena dan jingga metil menunjukkan komposit secara fisik memiliki penjerapan lebih baik dibandingkan komposit secara kimia. Namun, komposit secara kimia memiliki kekuatan magnet yang lebih kuat sehingga proses pemisahan adsorben dan adsorbat dapat dilakukan menggunakan magnet. Hasil uji isoterm adsorpsi komposit pada larutan biru metilena dan jingga metil mengikuti tipe isoterm Langmuir.
Keyword: adsorpsi, Fe3O4, isoterm, karbon aktif, komposit

Judul: Sintesis Komposit Fe3O4/Bentonit Asal Daerah Nanggung, Bogor, Jawa Barat sebagai Adsorben Biru Metilena.
Abstrak: Bentonit merupakan salah satu jenis bahan yang umum dijadikan sebagai penjerap limbah zat warna. Namun, terdapat kesulitan dalam pemisahan dan pengumpulan kembali adsorben setelah proses penyerapan. Oleh karena itu, dilakukan pengompositan bentonit dengan oksida besi guna mengatasi masalah tersebut. Komposit Fe3O4/bentonit disiapkan dengan melarutkannya ke dalam NaOH, dicuci dengan akuades, kemudian dikeringkan dalam oven pada suhu 80 °C selama 4 jam. Pencirian dilakukan menggunakan spektronik 20D+ dan sifat magnet diuji secara kualitatif menggunakan magnet eksternal (magnet permanen). Hasil penelitian menunjukkan bahwa bentonit teraktivasi memiliki sifat yang baik dalam menjerap limbah zat warna. Hal ini dibuktikan dengan dilakukannya perbandingan terhadap bentonit yang tidak diaktivasi, magnet, dan komposit Fe3O4/bentonit. Namun, komposit Fe3O4/bentonit memiliki keuntungan, yaitu aplikasi yang sederhana dan pemisahan yang lebih mudah.
Keyword: adsorpsi, komposit Fe3O4/bentonit, oksida besi, sifat magnet

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