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

Judul: The life strategy of Arfak Tribe based on craniofacial shape, growth rate, and sexual maturation
Abstrak: Arfak tribe is one of traditional tribes living in Manokwari, West Papua Province. The tribe has an unique natural life differently with other tribes in Indonesia. The nature of a life cycle is a result of an adaptive response of the organism to the environmental conditions that reflect to the phenomenon of evolution of bio-culture and natural selection. The research concerned to the potential evolution characters was divided into three parts. The first study discussed the diversity of craniofacial shapes of Arfak tribe in Manokwari, West Papua Province, based on 26 landmark frontal side and 16 landmark lateral side of face. Distribution individual in morphology space first five RW components have ellipsoidal pattern distribution. This means face variability relatively heterogen and polarized. The second study discussed a cross-sectional study of body size growth patterns of Arfak children and adolescents aged 6-23 years for boys and aged 6-19 years for girls. Growth rate of body weight of Arfak children at juvenile phase tend to faster than that of other population. The strategy of faster growth during juvenile phase is as a manifestation of unstable environmental condition. One of unstable environment conditions is a risk of death caused by diseases. The most common diseases suffered by children in West Papua is malaria diseases. The third study reviewed a cross-sectional study of the age at menarche and age at spermarche among the Arfak children, and the association between somatic maturation and gonad maturation. We found that median age at menarche of Arfak girls is 12,2 years, while median age at spermarche is 13,6 years. A possible factor causing young age at menarche is due to adaptation to unstable environmental conditions because of high risk of death by malaria disease in childhood. The events of menarche and spermarche achieved one year after the peak of body height velocity, and just before or at the same time with the time of maximum growth rate of body weight, body mass index, and body fat. Boys and girls accumulate body fat before puberty to be used as an energy reserve for the occurrence of gonad maturation. BF growth rate reached the lowest point at the age 16 years old, and then increase linearly with age until adulthood showed the adiposity rebound post-spermarche phenomenon. Based on these three aspects, namely smaller body size, younger age at menarche, and rapid growth rate of body weight at juvenile phase, Arfak tribe show fast life history strategy in an unstable environment. Malaria disease is a main factor of unstable environment which play a role in generating the adaptive response. On the other hand, the diversity of craniofacial since ancient still exist until now and do not show a unique typology as the three characters previously mentioned.
Keyword: 

Judul: Penentuan energi aktivasi ion untuk melewati membran teflon pada berbagai larutan elektrolit
Abstrak: Kaseno (1999) menyatakan bahwa dalam teknologi pemisahan, membran adalah bahan yang dapat memisahkan dua komponen dengan cara yang spesifik yaitu menahan atau melewatkan salah satu komponen lebih cepat dari komponen lainnya. Kemampuan pemisahan yang dimiliki oleh membran untuk melewatkan suatu senyawa kimia atau molekul diakibatkan oleh adanya perbedaan sifat fisika atau kimia antara membran dengan senyawa kimia.
Keyword: