Judul: Studi perbandingan mikroba rumen antara domba dan kambing lokal
Abstrak: Sheep and goats are a small ruminants. They have similar system of digestion. According to former research there are differences between sheep and goats especially in rumen microbial. The aim of this research is to compare the rumen microbial population and level of alantoin urine between breed (sheep and goat) and sex (male and female). This research used local sheep and goat which its given the same feed based on each body weight of livestock. The design of the experiment was a Randomized Complete Block design, which is factor A was species and factor B was sex with 5 replications. Data were analysed using ANOVA and significant differences will be further tested using Duncan test. The result showed that there is highly significant differences (P<0.01) in total bacteria and protozoa population between sheep and goat. Total bacteria population were highly significant (P<0.01) different between sex but there is no significant different in total protozoa population. The rumen pH showed that there is no significant different between species and sex. The level of alantoin urine are significant different (W0.05) between species, but there is not significant different between species and sex. No correlation between alantoin and population of rumen microbial in sheep and goat.
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Judul: Pengaruh rasio pemberian pakan yang berbeda terhadap produksi VFA dan NH3 rumen serta kapasitas lambung domba lokal jantan
Abstrak: The objective of this experiment was to different the VFA and NH3 production of rumen and stomach capacity of local male sheep. This experiment had held on March until may 2008. This experiment used complete randomized design and descriptive with three treatments and three replication. Significant differences among treatments further tested with Duncant test. This research used 9 local ram with two dietary treatments included: 80% grass and 20% complete feed for two months (PI), 20% grass 80% complete feed for two months (P2), 20% grass and 80% complete feed for one months and 80% grass and 20% complete feed for one months (P3). This treatment have done in two months of study. The main goal of in this research is to discover the effect of not different feed ratio to VFA and NH3 production rumen, and stomach capacity local male sheep. The treatment give not effect to volatile fatty acid and NH3 local male sheep, the results showed that relative volume of total stomach and weights of tissue to empty body weight were not significantly differents, weights of tissue retikulu-rumen, omasum and abomasum.
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Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition