Judul: Optimasi Konstanta Laju dalam Persamaan Compartment Absorption and Transit Termodifikasi dengan Menggunakan Gravitational Search Algorithm.
Abstrak: Pemodelan matematika telah dibuat untuk mengetahui laju penyerapan obat secara oral pada usus halus manusia. Kemudian dievaluasikan dengan hasil uji klinis untuk mendapatkan hasil yang valid. Metode Gravitational Search Algorithm (GSA) digunakan untuk mengoptimasi konstanta laju pada persamaan Compartment Absorption and Transit (CAT) termodifikasi agar diperoleh nilai R2 yang lebih dari 80%. Adapun parameter – parameter yang berpengaruh pada GSA antara lain jumlah partikel dan jumlah iterasi. Kemudian jumlah partikel akan divariasikan untuk mendapatkan nilai yang terbaik dan paling efisien. Hasil koefisien deterministik (R2) yang diperoleh dari simulasi atenolol pada dosis 25 mg, 50 mg dan 100 mg masing – masing adalah 81.571%, 82.588% dan 88.911%. Dengan jumlah partikel pada GSA yang paling efisien masing - masing adalah 40, 90 dan 60 partikel.
Keyword: CAT Termodifikasi, GSA

Judul: Aplikasi Gravitational Search Algorithm (GSA) untuk penentuan konstanta Transport pada Model Compartment Absorbtion and Transit.
Abstrak: Laju penyerapan obat secara oral pada usus halus manusia dapat diketahui menggunakan pemodelan matematika kemudian dievaluasi untuk mendapatkan hasil yang valid dengan metode Gravitational Search Algorithm (GSA) untuk mengoptimasi konstanta laju pada persamaan Compartment Absorption and Transit (CAT) termodifikasi agar diperoleh nilai R2 yang lebih dari 80%. Hasil koefisien deterministik (R2) yang diperoleh dari simulasi atenolol pada dosis 25 mg, 50 mg, dan 100 mg masing–masing adalah 85.806%, 93.193%, dan 93.406% didapatkan dengan menvariasikan jumlah partikel dan jumlah iterasi pada optimasi GSA untuk mendapatkan nilai yang terbaik dan paling efisien.
Keyword: CAT Termodifikasi, GSA

Judul: Phylogeography and Species Limits in the Papuan White Snake (Micropechis ikaheka) (Reptilia: Serpentes: Elapidae)
Abstrak: Papua white snake, Micropechis ikaheka, has been distingushed into two subspecies M.i. ikaheka and M.i. fasciatus. However, due to lack of data on their morphology, distribution and ecology, both subspecies often ignored in scintific discussions and refers only byas , Micropechis ikaheka. This study was designed to document the differences between M.i. ikaheka and M.i fasciatus by using scales characteristics and reproductive organ or hemipenes. The study also examine, zoogeography, habitat, diet and cannibalism of both subspecies to better understanding the the ecology of one of the most venomous snakes in the world. This study consists of three topics with method and also different in the size samples, respectively. The first study is the histology and microtopography of the skin were studied using paraffin method and Scanning Electron Microscope (SEM). The second is the hemipenis were examined by following Myers and Cadle (2003), and Zaher and Prudente (2003). The third is the abdominal surgery was carried out to document diet type and the investigate phenomenon of cannibalism in the snake. Specimens for this study came from the collection from Museum Zoologicum Bogoriense (MZB) and Universitas Negeri Papua’s Laboratory (LZU). The research result also indicated that the markers of skin and hemipenis described the same structure and microornamentation in all M. ikaheka groups being compared. Based specimens examined morphological descriptions do not s support the further differentiation in Micropechis. In short, two markers that used in this study could not sufficiently indicate the differences in the level of species and subspecies of M. ikaheka. The study, however, were able to delineate zoogeography and skin color patterns, which fall into four groups: M. i. ikaheka; M. i. fasciatus. M. i. ssp. “intermediate”; and M. i. ssp “black”. This study also revealed that color variations did not overlap in their geographic distribution. It is therefore, it suggested that environmental factors may contribute to the skin color variations. It also assumed that habitat discontinuous and biogeography factors may also cause the loss of the connection between the original populations (vicarians) or follow colonization events (dispersal). The examined of 22 stomach contents of M. ikaheka shows this species is carnivorous, and prey on vertebrates such as amphibians, fish, reptiles, and Mammals. These snakes are opportunistic predators since they prey on all that can be captured, but mainly reptiles (61.5%), followed by mammals and fish (both 15.4%), and amphibians (7.7%). Although categorized as terrestrial animal, the diet study showed that M. ikaheka snakes often go into the water to hunt for fish (the sample from Yapen island), including eel (the sample from Aru island). Based on prey items indentified, there is evidence that M. ikaheka is cannibal. At this time, there still no record on reason for cannibalism, but it is assumed that cannibalism was due to competition between populations and means to control population.
Keyword: geographic variation, white snake, papua