Judul: Kadar Lignin dan Delignifikasi Empat Jenis Kayu Eukaliptus.
Abstrak: Lignin content and its reactivity are known as an important characteristics of wood in relation to the pulping process, because it will affect the process easiness and pulp quality. The aim of the research was to measure lignin content and delignification of four Eucalyptus woods, which is widely used as raw material in pulp industry. Lignin content was determined as Klason lignin, acid soluble lignin, and total lignin, whereas delignification was expressed as solubility lignin in alkaline cooking. The result show that Klason lignin of four Eucalyptus woods were 25.14-36.65% and acid soluble lignin were 2.07-2.44%. Alkaline cooking at 150 °C for 90 min obtained solubility of lignin 18.54-31.60%. The variety of acid soluble lignin of four Eucalyptus woods was not big different, therefore delignification was influenced by Klason lignin.
Keyword: acid soluble lignin, delignification, Eucalyptus, lignin solubility, Klason lignin

Judul: Keragaman Kadar Lignin pada Kayu Reaksi Apiapi dan Kelarutannya dalam Delignifikasi Alkali.
Abstrak: Reaction wood is a wood xylem formed as a respons of tree to external forces. Reaction wood has different chemical characteristics compared with normal wood. This research aimed to examine the variation of lignin contents at different positions in the reaction wood of Api-api (Avicennia sp.), and lignin solubility in alkali cooking. Klason lignin and acid-soluble lignin contents were determined using Klason method and UV-spectrophometry. Cooking experiment was carried out in 20% alkali solution at 150 C for 45 min. Klason lignin content varied between samples position was 15.03-20.8%, and acid-soluble lignin content was 3.06-4.29%. Wood samples derived from severest reaction wood part tend to have lowest Klason lignin content and highest acid-soluble lignin content. The lignin solubility of Api-api wood in the alkaline cooking at 150 C for 45 min was 46.13-54.47%. Although the statistical test was not significant, however, the lignin Avicennia sp. wood was relatively easy to be delignified in alkali cooking.
Keyword: Avicennia sp., reaction wood, klason lignin, acid-soluble lignin

Judul: Infeksin virus rota pada anak babi
Abstrak: Virus Rota sudah lama diduga sebagai salah satu penyebab diare pada anak babi yang baru dilahirkan. Hal ini diperkuat dengan berhasilnya Mebus dan kawan-kawan mengidentifikasi virus Rota pada kejadian diare yang ter jadi pada anak sapi yang baru dilahirkan. Infeksi virus Rota merupakan hal yang serius, kejadian yang mewabah pernah dilaporkan di Amerika Serikat, Inggris, Kanada dan Australia. Sedangkan kejadian di Indonesia yang dihubungkan dengan infeksi virus Rota belum dilaporkan. Virus Rota termasuk keluarga Reo viridea. Sesuai dengan namanya, virus Rota menyerupai roda (Rota = Wheel), mengandung asam nukleat (nucleid acid) yang berupa asam nukleat ribo (ribo nucleid acid, RNA) dan berserabut ganda (double stranded), tidak mempunyai selubung (envelop atau peplos). Hewan rentan adalah hewan yang berumur sangat muda. Selain menyerang babi, dapat pula menyerang sapi, domba, rusa, anjing, kucing, tikus, kelinci, unggas dan manusia. ...
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