Judul: Model sistem Pengendalian Proses Fermentasi Etanol
Abstrak: Model sistem penqendalian proses fermentasi etanol (FERMENTA.MDYt89) dirancanq densan mensgabunqkan Model Pemasukan Data (DATA.BAS), Model Penaolahan Data (OLAHDATA.BAS), dan Model Penqendalian (ETANO.BAS). Sebaaai parameter terukur dipilih konsentrasi qlukosa dalam bioreakto-r (S), dan Parameter terkendali diaunakan laju umpan sukstr-at CFJ.
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Judul: Kinetika Fermentasi Produksi Bioetanol Menggunakan Fermentor pada Medium Sintetis Bersenyawa Inhibitor
Abstrak: Hidrolisat lignoselulosa mengandung senyawa inhibitor yang menyebabkan stres inhibitorik pada khamir penghasil bioetanol. Tujuan penelitian ini adalah mengetahui parameter kinetika S. cerevisiae BTCC 3 selama proses fermentasi pada berbagai medium sintetis dengan konsentrasi inhibitor yang berbeda berdasarkan model kinetik tak terstruktur. Fermentasi dilakukan dalam sistem batch selama 48 jam tanpa pengulangan dengan glukosa dan xilosa sebagai sumber karbon. Konsentrasi sel, gula, bioetanol, dan senyawa inhibitor dianalisis dengan spektrofotometer (600 nm) dan HPLC untuk penentuan parameter kinetika fermentasi. Hasil yang diperoleh menunjukkan bahwa peningkatan konsentrasi inhibitor memberikan efek negatif pada laju pertumbuhan sel spesifik (μ), laju pertumbuhan sel spesifik maksimum (μmax), konsentrasi sel maksimum (Xmax), rendemen biomassa (YX/S), dan rendemen biomassa pertumbuhan (YX/S(growth)), namun sebaliknya memberikan efek positif pada laju konsumsi substrat spesifik (qS), laju pembentukan produk spesifik (qP), laju pemeliharaan sel spesifik (m), dan konstanta saturasi (Ks). Selain itu, peningkatan konsentrasi inhibitor tidak mempengaruhi rendemen produk (YP/S) dan laju kematian sel spesifik (Kd). Hasil evaluasi menunjukkan bahwa model memiliki rentang nilai RMSE (Root Mean Square Error) dan R2 (koefisien determinasi) masing-masing adalah 0,0158-0,4902 dan 0,9014-0,9992. Dengan kata lain, model kinetik yang digunakan dalam penelitian ini cukup baik dalam menggambarkan dan memprediksi proses fermentasi oleh strain BTCC 3 dalam berbagai medium pada fermentor skala 3 L.
Keyword: fermentor, khamir, kinetika fermentasi, model kinetik tak terstruktur, stres inhibitorik

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