Judul: Interaksi landak laut dan lamun di Pulau Barrang Lompo,  Kepulauan Spermonde, Sulawesi Selatan
Abstrak: Sea urchin is an active grazer on seagrass. The grazing may have affected on the seagrass bed. The aim of this research was to study the interaction between the sea urchin and seagrass in the Barrang Lompo Island, South Sulawesi. The measurement of the seagrass and the sea urchin density were using a linier quadrant transect method. Correlation between the seagrass and the sea urchin were analyzed using Pearson‟s correlation. The results showed that the highest value of INP (Indeks Nilai Penting) were Thalassia hemprincii (129,39), Enhalus acoroides (88,92), Cyomodecea rotundata (36,10), Halodula uninervis (28,26), Halophila ovalis (9,23) and Syngirodium isoefolium (7,16), respectively. The community of sea urchin was dominated by Tripneustes gratilla (63.69 ind/m2), followed by Diadema setosum (23.10 ind/m2), Echinotrix calamaris (6.10 ind/m2), Echinotrix diadema (2.47 ind/m2), Echinometra matheai (1.33 ind/m2), and Mespilia globulus (1.33 ind/m2). No relationship beetwen seagrass and sea urchin was observed (r= -0.111, P= 0.485) since not all the sea urchin are grazer. Between seagrass on three age stages and sea urchin also showed no significant relationship since the stage pattern of seagrass and its tanin content may not preferred by the sea urchin. The present of T. gratilla and D. setosum as main grazer however showed no significant relationship with the seagrass. D. setosum is food adaptive and T. gratilla utilizes the seagrass leaf as food and protection from wave and predator.
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Judul: Analisis komunitas padang lamun dan kandungan zat hara di perairan Pulau Barrang Lompo, Kepulauan Spermonde, Sulawesi Selatan
Abstrak: Lamun adalah tumbuhan berbunga yang hidup dan tumbuh di perairan pesisir subtidal. Daur hidup dan pertumbuhan lamun umumnya ditentukan oleh ketersediaan zat hara fosfat, nitrat, dan amonium. Tujuan penelitian ialah menganalisis struktur komunitas vegetasi lamun serta hubungannya dengan kandungan zat hara di perairan kepulauan Spermonde, Sulawesi Selatan. Analisis kandungan zat hara dilakukan dengan pengambilan sampel air antara dan air kolom di stasiun pengamatan tersebut. Kandungan zat hara fosfat, nitrat, dan amonium pada lokasi pengamatan sangat rendah. Konsentrasi zat hara pada air kolom lebih rendah dibandingkan air antara di padang lamun tersebut. Pengukuran kepadatan lamun dilakukan menggunakan metode transek linier kuadrat di 3 stasiun pengamatan (utara, barat, dan selatan pulau Barrang Lompo). Analisis vegetasi lamun diperoleh INP (Indeks Nilai Penting) terbesar pada Thalassia hemprichii (129,39), kemudian diikuti oleh Enhalus acoroides (88,92), Cyomodecea rotundata (36,10), Halodula uninervis (28,26), Halophila ovalis (9,23) dan Syringodium isoetifolium (7,16).
Keyword: Analysis of Seagrass, In the water of Pulau Barrang Lompo

Judul: Sintesis Flavon dari Fenol dan Benzoil Klorida
Abstrak: Flavone is a class of flavonoid, commonly found in plants with wide bioactivity spectrum. A widely used flavone synthesis route is through acidcatalyzed oxidative cyclization of β-diketone. In this study, unsubstituted flavone had been synthesized via 5-step from phenol, with 22% yield and successfully increased the yield of previous study on Fries rearrangement of phenyl acetate and benzoylation of o-HAP steps. Phenol was acetylated resulting 93% phenyl acetate. AlCl3-catalyzed Fries rearrangement in 1.5 hour and at 120 °C converted phenyl acetate into o-hydroxyacetophenone (o-HAP) with 40% yield. AlCl3 as catalyst produced o-HAP with higher and reproducible yield compared with BF3·Et2O and ZnCl2. Benzoylation of o-HAP followed by Baker-Venkataraman rearrangement of the ester product using KOH in dried pyridine produced β-diketone 1-(2- hydroxyphenyl)-3-phenylpropane-1,3-dione. The yield of ester and β-diketone were 71% and 85%, respectively. Finally, oxidative cyclization of β-diketone with sulphuric acid as catalyst produced 99% of flavone. The flavone product had been characterized spectroscopically and its melting point as well.
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