Judul: Rekrutmen Karang pada Substrat Batu di Gosong Pramuka, Kepulauan Seribu DKI Jakarta
Abstrak: Gosong Pramuka is an area of coral reefs in the center of the Kepulauan Seribu region economy. The existence of the stony substrate around Gosong Pramuka as a potential habitat for coral larval settlement. Research aims to determine the recruitment of coral stony substrate in the Gosong Pramuka, Kepulauan Seribu. Research was conducted from April to June 2013 at Gosong Pramuka, comprising four stations: Exposed I, Exposed II, Sheltered I, and Sheltered II. Observations were conducted by observing all surface of stony substrate for coral recruits. Each coral recruits were vertically photographed using underwater camera with macro setting, thus identified until genus level. Images of coral recruit were processed by Image J to measure coral diameter and width. There were 95 colonies of coral recruits with the largest number of colony observed at Station Exposed I (35 colonies) belonging to Acropora and Porites. Lifeform of coral recruit for Acropora comprised of branching, digitate, tabulate and encrusting, while for Porites was massive and submassive. Average width of coral recruit was 25-50 cm2, while average diameter was 9-12 cm. Average index of coral health was 2-3, referring to CoralWatch method, indicating stressed colonies. Density of coral recruit for Station Exposed I was 0.22 colony/m2, Sheltered I 0.11 colony/m2, Exposed II 0.13 colony /m2 and 0.11 colony /m2 at Sheltered II. Correspondence analysis revealed that the presence of Porites coral recruit was influenced by depth, salinity, pH, temperature, while Acropora by distance from reef/stone bottom. Average diameter and width of coral recruits were closely associated with orthophosphate. Diameter of coral recruit was closely affecting the coral width.
Keyword: stony substrate., Porites, Gosong Pramuka, coral recruit, Acropora

Judul: Analisis Laju Pertumbuhan dan Kelangsungan Hidup Karang Acropora spp., Hydnopora rigida, dan Pocillopora verrucosa yang Ditransplantasikan di Pulau Kelapa, Kepulauan Seribu
Abstrak: Penelitian mengenai transplantasi karang ini berlokasi di Pulau Kelapa, Kepulauan Seribu, Jakarta, selama enam bulan pengamatan, dimulai dari Maret 2009 hingga September 2009. Karang yang diteliti adalah karang jenis Acropora spp., Hydnopora rigida, dan Pocillopora verrucosa. Fragmen karang dilekatkan dengan menggunakan semen kemudian diletakkan pada modul yang terbuat dari beton di kedalaman 2-5 meter. Pengamatan terhadap pertumbuhan karang dan parameter kualitas perairan dengan bantuan SCUBA dilakukan setiap dua bulan. Tujuan penelitian adalah untuk mengetahui laju pertumbuhan karang serta parameter yang mempengaruhi transplantasi karang sehingga bisa diketahui tingkat keberhasilan dari metode transplantasi karang terhadap jenis yang ditanam. Secara umum kondisi perairan masih berada dalam kondisi cukup baik untuk pertumbuhan karang. Kisaran suhu 28-29° C, salinitas 30-32‰, kecerahan 100%, kecepatan arus 0,08-0,30 m/s, kekeruhan 1,1-1,7 NTU, nitrat 0,005-0,024 mg/l, ammonia 0,046-0,197 mg/l, ortophosphat 0,008-0,023 mg/l, dan sedimentasi 2,7123-5,8146 mg/cm2/hari. Kegiatan transplantasi karang di lokasi ini dapat dikatakan berhasil karena tingkat kelangsungan hidup dari ketiga karang tersebut berada di atas 50%. Selama enam bulan pengamatan karang jenis Acropora spp. memilliki tingkat kelangsungan hidup sebesar 78,44%, karang jenis Hydnopora rigida sebesar 74,19%, dan karang jenis Pocillopora verrucosa sebesar 61,11%. Kematian karang terbesar diakibatkan oleh meningkatnya kelimpahan makroalga yang diakibatkan oleh meningkatnya kesuburan perairan selama enam bulan pengamatan.
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Judul: Isolasi senyawa sinamaldehida dari minyak kulit kayu manis sedagai antioksidan
Abstrak: Cinnamaldehyde is a major essential oil component of cinnamon bark. Cinnamon oil was isolated by using water distillation method that yielded 0.93% (w/w) or 0.95% (v/w). Gas chromatography mass spectrometry (GCMS) of cinnamon oil showed that the main component of the oil is a trans-cinnamaldehyde 32.8% and 3-phenyl-2-propenal 22.9%. The oil was further isolated for cinnamaldehyde by using preparative thin layer chromatography method at Rf of 0.62. GCMS analysis showed that cinnamaldehyde content was 89.1%. Furthermore, the cinnamaldehyde was tested for its antioxidant activity. The isolated product has antioxidant activity with IC50 of 5.06 mg/L as compared with positive control using butylated hydroxytoluene, which has the activity of 10.4 mg/L.
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