Judul: The Potency of Proteolytic Bacteria as Biocontrol of Microcystis aeruginosa BT-02 in Carp (Cyprinus carpio).
Abstrak: Cyanobacteria are group of phytoplankton that commonly found in bodies of fresh water all over the world. Cyanobacteria like Microcystis aeruginosa, produce microcystin (MCYST). MCYST is a monocyclic heptapeptide hepatotoxin which has cause fish mortalities. This study was conducted to know the potency of proteolytic bacteria isolated from digestive tract of tilapia fish strain GIFT which have ability to inhibit the growth of M. aeruginosa BT-02. The isolates of proteolytic bacteria which have the ability to inhibit the growth of M. aeruginosa BT-02, i.e NU-4 and NU-8 have been identified as Aeromonas. The inhibition index that produced by NU-4 (1,71) was higher than NU-8 (1,34). The inhibition mechanism is still unknown. Toxicity test revealed that there were not any carp fish die during the experiment, but there were some histological changes observed in liver and intestinal of treated carp fish with M. aeruginosa cells.
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Judul: Isolation and Selection of Bacillus sp. as the Microbial Agent for Ammonia, Nitrite and Nitrate Degradation in Catfish dan Goldfish Rearing Environment.
Abstrak: Intensive fish farming which applying high stocking densities requires a high amount of feed input. This will result in accumulation of organic and inorganic materials (including ammonia, nitrite and nitrate compounds) which are toxic to fish. Those problems can be resolve by the application of probiotics which have the ability for bioremediation as Bacillus sp. The spores of Bacillus sp. have advantages because it is more stable for a long time. The use of probiotic Bacillus sp. involved in nitrification and denitrification processes in aerobic condition will reduce the accumulation of ammonia, nitrite and nitrate in the fish rearing environment, since the compounds will be converted into nitrogen gas. This study aimed to isolate and select Bacillus sp. species as a potential microbial agent which will degradate the toxic metabolites such as ammonia, nitrite and nitrate These research have four stages : (1) the isolation of Bacillus sp. from water, waterplant’s root and sediment in freshwater fish ponds,(2) the selection of bacteria in basal media for nitrification and denitrification,(3) the selection of bacteria in synthetic pond water medium and (4) the selection of Bacillus sp. ability in the in vivo test (. in catfish and goldfish rearing environment). Among collection of our isolates, Bacillus cereus and Bacillus subtilis showed the highest ammonia degradation; as much as 56,60% and 63,18% respectively from the initial concentration of 131 mg/l TAN (Total Ammonia Nitrogen); and nitrate compound as much as 40,97% and 26,51% respectively from the initial concentration 530 mg/l. The mixed of two isolates designated by Bacillus cereus and Bacillus subtilis in synthetic pond water showed the highest capability in oxidizing ammonia (66,32%) from the initial concentration of 30,2 mg/l TAN and the reduction of nitrite (19,77%) from the initial concentration of 0,263 mg/l nitrite and nitrate (28,37%) compounds from the initial concentration of 32,6 mg/l nitrate. In the in vivo experiment, using carp and catfish (4-5 cm) in the aquaria (30 l). Each fish exposed in the control water (without inoculation of bacteria) and treatment water (with a mixture of Bacillus cereus and Bacillus subtilis inoculation, 109 cfu/ml total isolate, 3 ml/aquaria). In the in vivo experiments, TAN and nitrate concentrations in treatments inoculated by isolates were lower compared to that of control (without any isolate inoculation) (statistical tests P <0.05), whereas the nitrite concentration in the control and treatment were not significantly different. The inoculation of Bacillus cereus and Bacillus subtilis Keywords: Bacillus sp., ammonia degradation, degradation of nitrite, nitrate reduction showed ammonia degradation as much as 30% from the initial concentration of 6,12 mg/l TAN, and reduce carp and catfish’s mortality compared to that of control.
Keyword: Bacillus sp, ammonia degradation, degradation of nitrite, nitrate reduction

Judul: Pembangunan Perumahan Pada Wilayah Desakota Kaitannya Dengan Sistem Sosial Masyaraka t Asli
Abstrak: Faktor utama yang banyak mempengaruhi meningkatnya jumlah perumahan dan pemukiman pacta wilayah desakota adalah adanya tekanan populasi sebagai akibat dari migrasi besar-besaran menuju daerah desakota. Dengan kata lain, lokasi perumahan atau pemukiman menjadi tak memiliki banyak pilihan lagi, kota telah sesak dan sasaran selanjutnya para pengais materi di daerab kota adalab wilayah desakota. Masyarakat asli yang sejak lama tinggal di wilayah desakota merupakan bagian dari masyarakat desakota yang perlu diperhatikan. Baik disadari maupun tidak disadari, perubaban pada masyarakat asli desakota akan terjadi karena masyarakat selalu dalam keadaan dinamis. Selain itu perubahanjuga akan terjadi dikarenakan masyarakat adalah sistem yang terdiri dari bagian-bagian yang berhubungan serta berintegrasi secara fungsional, sehingga perubaban pada satu fungsi dari masyarakat akan mempengaruhi fungsi lainnya.
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