Judul: Karakteristik Reflektansi Spektral Karang dan Substrat Dasar Terumbu di Kepulauan Seribu
Abstrak: Remote sensing is the most effective approach to map large coral reef area in comparison to conventional methods. However, applying remote sensing technology for detail mapping of coral reef habitat requires in situ spectral reflectance information of reef benthic substrates. The objective of this research was to analyze the spectral reflectance characteristics of coral and reef benthic substrates in Seribu Islands using spectrometer. Field study was conducted at seven sites in four reef cays of Seribu Islands in June 2011. Spectral reflectance curves of corals and reef benthics showed the similar pattern with two peaks near wavelength 575 and 600 nm. Cluster analysis resulted in four groups of corals and other reef benthics. Discriminant analysis revealed that 400-450 nm and 650-700 nm were the two wavelength spectra enabling to reflectance differentiation types of coral and reef benthic substrates.
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Judul: Analisis Karakteristik Bio-Optik Genera Karang Keras Berdasarkan Respon Spektral
Abstrak: In situ bio-optic characteristics of corals were studied by examining spectral reflectance, absorbance, and irradiance, which applicable to improve further classification of corals from other type of reef benthics using remotely sensed satellite imagery. Corals are biological forming habitat (biotope) and geostructure created by corals can be clearly seen from space, thus constitute integral parts of dynamic coastal environment alongwith sand, seagrass, mud, rocks, and other types of substrate. The objective of this research was to study in situ bio-optical characteristics of several coral genera. Field data acquisition was performed on June 8 to 13, 2011 at Panggang Island and adjacent waters in the Seribu Islands. A total of 7 sampling stations and 65 samples of coral spectra were collected, comprising of spectral reflectance, irradiance, and absorbance. Bio-optic set data obtained were filtered prior to segregation at visible wavelength (400-750 nm) and curve-fitteddusing moving average method. Data analysis were as follows: curve pattern analysis, cluster analysis, discriminant analysis and spectral analysis at particular wavelengths. Results of this study showed that the patterns of reflectance, iradiansi, and absorbance of 18 hard coral genera were similar one another, yet there exist different magnitude response at particular bands of wavelength, as affected by coral colony pigmentcoloration (visually) and type of coral corallite. Further application of in situ biooptic may not differentiate coral species using satellite imagery, yet will be valid to separate living hard corals from other type of reef benthics (soft coral, rubble, etc).
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Judul: Perkembangan Histomorfologis Aorta Fetus Kambing Kacang (Capra hircus) pada Induk yang Diinduksi dengan Gonadotropin sebelum Pengawinan
Abstrak: Informasi mengenai pengaruh pemberian hormon Pregnant Mare Serum Gonadotropin (PMSG) kepada induk pada peningkatan kualitas keturunan secara umum masih kurang dan khususnya pengaruh pada perkembangan aorta fetus yang dikandungnya. Penelitian ini bertujuan untuk mengkaji perkembangan struktur histomorfologis aorta fetus kambing kacang berumur 15 minggu dari induk yang diinduksi hormon PMSG. Penelitian ini menggunakan tiga fetus kambing kacang, terdiri atas fetus dari indukan yang tidak diinduksi hormon PMSG (Kontrol atau IN), fetus dari indukan yang diinduksi hormon PMSG dosis 7,5 IU/kg BB (IP7,5), dan fetus dari indukan yang diinduksi hormon PMSG dosis 15 IU/kg BB (IP15). Aorta fetus dievaluasi secara histologi dengan pewarnaan hematoksilineosin (HE), kemudian dievaluasi dengan mikroskop dan dianalisis menggunakan metode t-test pada Microsoft excel. Hasil penelitian menunjukkan bahwa pemberian hormon PMSG sebelum pengawinan induk dapat meningkatkan nilai histomorfometri aorta dan memperpanjang masa perkembangan aorta dibandingkan dengan aorta fetus kontrol (IN). Kesimpulan, penyuntikan hormon PMSG pada induk kambing sebelum dikawinkan memberikan perkembangan struktur yang signifikan pada aorta fetus umur 15 minggu.
Keyword: aorta, fetus, kambing kacang, perkembangan, PMSG