Judul: Studi perbandingan fisio anatomi saluran pencernaan kambing dan domba lokal
Abstrak: The objectives of the experiments were to compare the physio anatomy of gastro intestinal tracts between local goats and local sheep. The experiments were conducted held from March to July 2005. The experiments used ten goats (5 males and 5 females) and ten sheep (5 males and 5 females). The experimental design used was Randomized block design with factorial (2x2). Significant differences among treatments futher tested with Duncant test. The results showed that relative volume of total stomach and weights of stomach tissue to empty body weight were not significantly differences, retekulo-rumen, omasurn and abomasum volume had significantly differences, weights of tissue retikulo-nunen, omasum and abomasum to empty body weight were not significantly differences for species and sexs., Relative of abomasum volume was large significantly (P<0.05) in male goat, Small intestine length to bone length, retention time was large significantly (Pi0.05) in sheep more than goat.
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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: Sintesis nanopartikel Cu2ZnSnS4 menggunakan teknik hidrotermal
Abstrak: Nanopartikel Cu2ZnSnS4 (CZTS) merupakan semikonduktor yang berpotensi sebagai fotokatalis untuk reaksi fotodegradasi zat pewarna. Semikonduktor ini memiliki sela pita yang jauh lebih kecil dibandingkan dengan semikonduktor TiO2, sehingga memungkinkan dapat berkerja hanya dengan paparan sinar matahari. Nanopartikel Cu2ZnSnS4 telah berhasil disintesis menggunakan teknik hidrotermal dengan suhu 200 oC selama 24 jam. Larutan Cu2ZnSnS4 dinetralkan menggunakan amonium hidroksida dan dialiri gas N2 sebelum proses hidrotermal. Hasil analisis mikroskop elektron pemayaran menunjukkan nanopartikel Cu2ZnSnS4 mengalami aglomerasi karena memiliki ukuran partikel yang besar. Hasil analisis difraktogram sinar-X menunjukkan bahwa Cu2ZnSnS4 yang dihasilkan memiliki struktur kesterit dengan senyawa fase sekunder yang terbentuk adalah CuS, ZnS, dan Cu2SnS3. Hasil uji fotodegradasi menunjukkan bahwa senyawa hasil sintesis memiliki kemampuan degradasi dibawah sinar matahari lebih baik dibandingkan dengan TiO2. Namun, pada paparan sinar UV, TiO2 mendegradasi biru metilena lebih baik daripada senyawa hasil sintesis. Kapasitas adsorbsi terhadap biru metilena sebesar 2.6780 mg/g menunjukkan bahwa senyawa hasil sintesis tidak mampu mengadsorpsi dengan baik, sehingga disimpulkan bahwa hilangnya biru metilena dari larutan disebabkan oleh fotodegradasi, bukan oleh adsorpsi
Keyword: band gap, Cu2ZnSnS4, kesterite, photocatalyst, semiconductor