Judul: Katalis Eterifikasi Gliserol Berbasis Poli–(asam stirena sulfonat) dari Limbah Styrofoam.
Abstrak: Styrofoam waste can be converted to poly–(sulfonate styrene acid) (PSSA) that can be used as catalyst. The objective of this research is to get PSSA that can catalyze the etherification of glycerol and benzyl alcohol. The styrofoam waste was converted to PSSA by reacting with H2SO4 98% (as sulfonation agent) and P2O5 (as sulfonation catalyst) at 40 °C for 6 hours. Characterizations of PSSA included functional groups, sulfonation levels, water swelling, and thermal stability. The yield of PSSA was 40-55%. The success of sulfonated polystyrene was shown by –SO3H group absorption at 1157.29 cm-1. Etherification of glycerol and benzyl alcohol using PSSA catalyst was conducted at 110 °C for 12 hours. The conversion in producing mono–benzyl ether glycerol was 8.10%, 1,3–dibenzyletherglycerol 2.60%, and dibenzyl ether 9.80%. Therefore, the PSSA can be used as etherification catalyst.
Keyword: benzyl alcohol, etherification, glycerol, polystyrene, PSSA

Judul: Rasio Molar dan Konsentrasi Katalis Methyl Ester Sulfonic Acid pada Proses Sintesis Gliseril Ester
Abstrak: Glycerol is a by-product of biodiesel industry production which still can be further processed into more value-added products. The example is the utilization of glycerol by means of esterification between glycerol and oleic acid with methyl ester sulfonic acid (MESA) catalyst, producing glyceril ester. The purpose of this study was to obtain the conditions of esterification with variable factors were molar ratio between oleic acid and glycerol and the concentrations of added MESA catalyst. Before esterification, crude glycerol was purified by adding 5% (v/v) phosphoric acid 85%, producing glycerol with ±80% glycerol content. Furthermore, glycerol was then esterified with supply of nitrogen, at temperature of 180 °C, and the stirring speed of 400 rpm for 90 minutes. The best combination of molar ratio and concentration of catalyst MESA is on ratio molar 0,8:1 (glycerol : oleic acid) with 0,5% added of catalyst MESA. Esterification on that condition produced glyceryl ester with the yield of 79,55%, density 0,940 g/cm3, acid value 44 mg KOH/g sample, viscosity 90 cP (30 oC), kinematic viscosity 49,04 cSt (40 oC), flash point 206 oC, pour point -1,5 oC, and boiling point 105 oC.
Keyword: Bogor Agricultural University (IPB), glyceryl ester, esterification, MESA, glycerol

Judul: Penyebaran virus Newcastle-Disease (ND) pada burung liar
Abstrak: Banyak usaha yang telah dilakukan untuk mencegah dan mengendalikan terjadinya serangan wabah ND, seperti misalnya peningkatan sanitasi dan vaksinasi ND. Akan tetapi sam pai saat ini pengendaliannya belum dapat dilakukan secara tuntas. Banyak masalah yang menyebabkan kegagalan dari usaha untuk mengendalikan wabah ND, salah satu masalah yang perlu dipertimbangkan dalam penanggulangan wabah ND adalah sumber dan penyebaran virus ND oleh burung liar (Ronohardjo, 1980). Walaupun telah diketahui bahwa burung liar mempunyai peranan dalam penyebaran penyakit unggas, tetapi harus diakui bahwa sedikit sekali informasi mengenai jenis burung yang mempunyai potensi sebagai sumber dan penyebar virus ND. Selain menyebarkan penyakit unggas, burung liar juga dapat menyebarkan penyakit mammalia (Ottis and Bachmann, 1983). ...
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