Judul: Pembuatan Karboksimetil Selulosa dari Selulosa Mikrobial (Nata de cassava)
Abstrak: Utilization of microbial cellulose from nata de cassava as carboxymethyl cellulose (CMC) provide an alternative raw material of cellulose in manufacturing CMC. The purpose of this study is to investigate carboxymethyl cellulose manufacturing process using nata de cassava and to determine the best concentration of natrium hydroxide solution in alkalization to produce the CMC with the characteristics that qualified, characterized from the parameter degree of substitution (ds), purity, acidity, concentration of sodium chloride (NaCl), moisture and viscosity of CMC solution. The methods of manufacturing CMC are alkalization and etherification process. Alkalization produces alkali cellulose which has a higher reactivity than cellulose. Etherification is an exchange process of hydroxyl group with carboxyl group. In this research, natrium hydroxide with concentration 30%, 35%, and 40% were used in alkalization. Based on this research, the best product was made using natrium hydroxide concentration 35% with the characteristics of the degree of substitution is 0.9613, moisture 6.4228%, acidity 7.97, viscosity 148.52 cP, NaCl content 0.0291%, and purity 93.58%.
Keyword: Bogor Agricultural University (IPB), viscosity, nata de cassava, microbial cellulose, carboxymethyl cellulose, alkalization

Judul: Pembuatan Biofilm Selulosa Asetat dari Selulosa Mikrobial Nata de Cassava
Abstrak: Cellulose acetate is one of cellulose derivative produced by acetylation in acetate anhydride reactant. The objectives of this research are to produce cellulose acetate biofilm from microbial cellulose nata de cassava. Nata de cassava as fermentation product of tapioca liquid waste assisted by Acetobacter xylinum for 8 days dried and crushed into powder. Microbial cellulose powder was activated by glacial acetate acid, acetyled in acetate anhydride using ratio 1:3, 1:4, and 1:5 for 1, 2, and 3 hours then hydrolyzed by weak acetate acid. The suspension deposited in aquades, dried then crushed into powder form. Cellulose acetate powder diluted in acetone and added by glycerin then poured into glasses plate. Cellulose acetate has acetyl number between 30,60-44,51%. Biofilm has average tensile strength 320,50 kgf/cm2, elongation 3,06%, WVTR 461,97 g/m2/24 jam, and water absorbing power 10,52%.
Keyword: biofilm, cellulose acetate, microbial cellulose, nata de cassava

Judul: Biologi Troides helena helena dan Troides helena hephaestus (Papilionidae) di Penangkaran
Abstrak: Indonesia adalah negara kepulauan beriklim tropik dengan berbagai tipe habitat dan ekosistem. Kondisi alam Indonesia merupakan habitat yang cocok bagi berbagai fauna termasuk kupu-kupu. Diperkirakan sekitar 4 000 – 5 000 jenis kupu-kupu terdapat di Indonesia. Troides helena merupakan salah satu kupu-kupu yang memiliki kombinasi warna sayap indah dan berukuran besar, sehingga menarik perhatian kolektor kupu-kupu. T. helena termasuk satwa yang diperdagangkan dan telah memasukkan devisa dari subsektor kehutanan Indonesia. Untuk mencegah dari kepunahan karena eksploitasi yang berlebihan, maka pemerintah melindungi T. helena melalui PP No. 7 Tahun 1999. Semua genus Troides masuk dalam daftar Appendix II CITES, sehingga perdagangan jenis ini harus merupakan hasil budi daya di penangkaran.
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