Judul: Membran Komposit Selulosa Asetat-Polistirena Akibat Pengaruh SDS Dan Suhu
Abstrak: Nanopore membrane cellulose acetate-polystyrene with SDS as porogen, can be utilized as a filter in seawater desalination process. Nanopore membrane CA-PS was prepared under reverse phase method. The process was started with making polymeric mixed solution of cellulose acetate, polystyrene, and SDS in dichloromethane-acetone mixture (1:1), with composition of CA:PS:SDS were 9:1:0,5; 9:1:1; 9:1:1,5; 9:1:2; and 9:1: 2,5. The solution was stirred for ±16 hours and casted on the glass plate surface, and then submerged it into water of 40 oC and 60 oC. The average water flux in 40 oC temperature was 45,74−280,21 L/hour.m2 and in 60 oC temperature was 73,20−370,30 L/hour.m2. The average rejection index point membrane in 40 oC temperature was 23,41−37,39% and in 60 oC temperature was 30,77−37,93%. It showed that the membranes soaked in a warm water increased water flux and rejection index.
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Judul: Behaviour of Composite Membrane Nanopore Cellulosa Acetat-Polistirene (CA-PS) due to Surfactant and Temperature Effect.
Abstrak: Membrane can be used for separation because of its superiority such as simple, simplicity, low energy consumption, and environmentally sound product. The cellulose acetate membrane is an example of the environmentally sound product and is used widely, such as in waste water treatment installation. This is the follow-up of the previous research and focused at the modification of cellulose acetate membrane by polystyrene and cetiltrimetyl ammonium bromide (CTAB) as porogen. The experiment was started with production of cellulose acetate membrane with polystyrene and CTAB with compositions of CA:PS:CTAB of 9:1:0.5, 9:1:1, 9:1:1.5, and 9:1:2. The membranes were formed by molding the mixture into films followed by characterisation of water flux value, rejection index at pressure 20 psi, and analysis of the surface morphology of membrane by scanning electron microscope (SEM). The SEM photo showed that temperature and CTAB affected the amount and the size of pores, and membrane surface textures. Increasing water flux and decreasing rejection index were decreasing with the increasing amount of CTAB. The highest water flux value showed by membrane with CTAB 1.5 % (MCCT 3) membrane at 40 ºC temperature, that was 160.6054 (L/m2.jam). Whereas the highest rejection index was in MCCT 2 at 40 ºC temperature, 9.30 %. The SEM photo showed that MCCT 4 membrane soaked in 40 ºC had pore size of 0.25 μm (250 nm) whereas those soaked in 60 ºC temperature had pore size of 0.50 μm (500 nm). These the membranes were classified as nanofilter
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Judul: Penyebab kematian burung kakatua jambul kuning (Cacatua galerita) di Taman Margasatwa Ragunan dan Taman Burung TMII (Periode Januari 2001 - Januari 2002)
Abstrak: Studi kasus ini bertujuan untuk mengetahui penyebab kematian pada Burung Kakatua Jambul Kuning (Cacatua galerita) serta penanganan dan pencegahannya. Pengkajian ini berdasarkan pada pemeriksaan atau pengamatan langsung di lokasi kandang burung maupun lingkungannya, pengumpulan laporan data kasus penyakit, pengobatan dan pencegahannya, wawancara langsung dengan dokter hewan, paramedis maupun pemeriksaan feces serta studi pustaka. Upaya perlindungan terhadap burung Kakatua Jambul Kuning yang merupakan satwa langka sudah dilakukan oleh Pemerintah., terbukti dengan diterbitkannya Undang-Undang No. 5 tahun 1990, Surat Keputusan Menteri No.301/Kpts-II/1991, Peraturan Pemerintah Republik Indonesia No. 7 tahun 1999 (Sozer, 1999). Perlindungan yang selama ini telah dilakukan di penangkaran ex-situ Taman Margasatwa Ragunan (TMR) dan Taman Burung TMII (TB TMII). Pada kedua tempat penangkaran tersebut burung kakatua akan dipelihara sedapat mungkin seperti pada kehidupan di alam bebas. Hasil yang diperoleh pada kedua tempat penangkaran tersebut menunjukkan bahwa kasus traumatik merupakan kasus penyebab kematian yang tertinggi. Traumatik tersebut disebabkan beberapa hal dan yang tertinggi karena berkelahi. Di Kandang Karantina Taman Margasatwa Ragunan dilaporkan ada 3 kasus kematian traumatik dari 7 gambaran post mortem yang diperiksa (42,86%), sedangkan pada Kandang Pamer berjumlah 2 kasus dari 3 gambaran post mortem yang diperiksa (66,67%). Pada Taman Burung TMII kasus kematian yang disebabkan oleh traumatik, ditemukan di Klinik yang berasal dari Kandang Pamer sebanyak 2 kasus dari 3 gambaran post mortemnya (66,67%). Studi kasus ini diharapkan menjadi tambahan data acuan dalam upaya pelestarian dan pengembangan populasi Kakatua Jambul Kuning.
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