Judul: Proses Co-composting Bagas dan Sludge dari Industri Gula dengan Pengaruh Perbedaan Nilai C/N Awal dan Aerasi
Abstrak: Bagasse and sludge are solid waste of sugar industry which contained high organic material and have not been used optimally. The purpose of this research was to utilize bagas and sludge of the sugar industry through co-composting technology for making organic fertilizer and determine the influence of aeration and materials concentration on the value of C/N. Bagas and sludge combination were composted at C/N value of 30, 40, and 50. In composting process, aeration rate set on 0.4 l/minute.kg and 1.2 L/Kg of dry basis materials. The research was carried out two stages, that was preliminary research, it was determined composition of raw materials mixture, and primary research for determining C/N value during composting. Parameters monitored during composting were temperature done every day, pH and C/N determined every week. The result showed that aeration treatment did not give noticeable effect on C/N value and compost with initial C/N value of 30 gave the fastest decomposition process in co-composting stages
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Judul: Pengaruh Perbedaan Nilai C/N Dan Laju Aerasi Pada Proses Co-Composting Bagasse Dengan Blotong Pada Limbah Industri Gula
Abstrak: The sugarcane industry in Indonesia produce the waste from bagasse and filter cake that until recently is still not optimum in processing. One of alternatives handling is co-composting bagasse and filter cake that will produce compost and can reduce the amount of sugarcane industry wastes. This research aims to utilize bagasse and filter cake of sugarcane industrial waste for composting and aeration as well as differing effect of giving the C/N of the process. Composting methods used were aerated static pile technique and uses two factors of aeration and C/N ratio. Aeration was provided via active aeration (0,4 L/Kg of material and 1,2 L/kg material) and passive aeration with C/N respectively 30, 40, and 50. The composting process was running for a month with active aeration at first week. Analysis results show that aeration technique proved didn’t have significant effect in changing C/N value. After analysis, result shows that the most decrease C/N value is compost with starting condition 50 of C/N value. Generally, aeration factor are not related yet and do not have any significant interaction to co-composting C/N value.
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Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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