Judul: Sintesis Krisin dari Floroglusinol
Abstrak: Flavone is a class of flavonoid, widely distributed in vascular plants. Flavones containing hydroxyl groups at 5 and 7 position are quite important regarding their biological activities and their abiquity in nature. Flavone having hydroxyl groups only at position 5 and 7 or 5,7-dihydroxyflavone is known as chrysin. In this study, crude chrysin had been successfully synthesized in 3 steps from phloroglucinol as starting material. Phloroglucinol was acetylated with acetonitrile and HCl gas, resulting phloroacetophenone amount to 74%. Phloroacetophenone benzoylation with 4.5 equivalents of benzoyl chloride produced tribenzoyl phloroacetophenone in 103–107% of yield and the subsequent Baker-Venkataraman rearrangement of the ester by using KOH in dried pyridine produced crude chrysin, with conversion percentage of 71.62%. All synthetic products had been characterized by melting point and spectroscopically.
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Judul: Sintesis Monobenzil Krisin dari Floroglusinol melalui Zat Antara Kalkon Pinosembrin Sebagai Prekursor Krisin
Abstrak: In this experiment, monobenzyl chrysin (7-benzyloxy5-hydroxyflavone) was synthesized from phloroglucinol as its starting material through oxidative cyclization route of pinocembrin chalcone. The synthesis was started with acetylation of phloroglucinol and benzylation of phloroacetophenone using 2 equivalents of benzyl bromide for 24 hours. The yield of those two steps were 70% and 21%, respectively. The condensation of 4’,6’-benzyloxy-2’- hydroxyacetophenone obtained with benzaldehyde produced a benzyl-protected chalcone which is then cyclisized oxidatively with 1 equivalent of I2 in dimethyl sulfoxide. About 9% of the product of this reaction was a monobenzyl chrysin according to characterization using proton nuclear magnetic resonance spectrum. The overall yield of this product was 1% with respect to phloroglucinol. The optimization of benzylation time of reaction and amount of added I2 should be studied further in order to increase the yield before the benzyl deprotection process conducted
Keyword: Bogor Agricultural University (IPB), flavonoids, flavones, chrysin, chalcone

Judul: Studi Keberadaan Dugong (Dugong dugon Müller, 1776) dan Habitatnya di Kabupaten Bangka Selatan, Provinsi Kepulauan Bangka Belitung.
Abstrak: Dugong merupakan salah satu mamalia laut Famili Dugongidae yang terancam punah dan habitatnya di padang lamun. Penelitian ini bertujuan untuk menganalisis keberadaan, distribusi, dan habitat dugong serta keterkaitannya dengan kondisi habitat lamun. Data primer diperoleh dengan menggunakan Kuisioner Survei Dugong CMS-UNEP (CMS-UNEP Dugong Questionnaire Survey) yang telah distandarisasi secara internasional. Adapun data sekunder didapatkan dari beberapa jurnal. Penyajian data dengan menggunakan Microsoft Excel, sedangkan pemetaan data spasial dengan Google Earth dan Arc GIS. Hasil penelitian diketahui bahwa keberadaaan dugong di Kabupaten Bangka Selatan sangat jarang ditemui. Perairan Toboali, perairan Sadai hingga Kurau, dan perairan Tanjung Berikat merupakan tiga lokasi potensi keberadaan dugong terbanyak secara berkala. Distribusi lamun banyak ditemukan di pantai Tanjung Kerasak, desa Tukak, dan Pulau Lepar. Distribusi keberadaan dugong banyak ditemukan di daerah padang lamun dengan kedalaman 5 meter, yang mana padang lamun sebagai habitat dugong mencari makan.
Keyword: dugong, kuisioner survei dugong CMS-UNEP, lamun