Judul: IPB (Bogor Agricultural University)
Abstrak: Budidaya ikan dalam keramba jaring apung (KJA) merupakan sistem budidaya ikan yang produktif, namun potensial berdampak negatif terhadap lingkungan perairan akibat adanya sisa pakan sehingga mengakibatkan penurunan kualitas airnya. Budidaya yang berkelanjutan semestinya harus didasarkan pada daya dukung lingkungannya. Pendekatan sistem dengan membangun suatu model diharapkan mampu memberikan solusi komprehensif bagi pengelolaan budidaya ikan dalam KJA di perairan Waduk PB. Soedirman.
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Judul: IPB (Bogor Agricultural University)
Abstrak: Pemberian pakan buatan berprotein tinggi pada pembesaran ikan lele intensif dalam keramba menghasilkan limbah yang cukup besar terutama ammonia nitrogen. Ammonia merupakan limbah yang sangat toksik bagi hampir seluruh hewan akuatik sehingga keberadaanya dalam media pemeliharaan harus dikurangi. Ammonia dapat dikonversi menjadi biomassa bakteri heterotrof yang tumbuh maksimal melalui peningkatan rasio C/N dengan menambahkan sumber karbon organik. Penelitian bertujuan untuk menganalisa pengaruh pemberian unsur karbon pada limbah budidaya ikan lele terhadap kelimpahan bakteri heterotrof dan kualitas air terutama nitrogen anorganik; menganalisa pemanfaatan bakteri heterotrof oleh udang galah pada tingkat penebaran yang berbeda; serta mengkaji sistem akuakultur berbasis trophic level melalui teknologi biofloc. Manfaat penelitian ini adalah teknologi untuk meningkatkan efisiensi pakan dan air, meningkatkan efektivitas wadah budidaya,mengurangi pencemaran air dan meningkatkan produksi.
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Judul: Characterization of The Chemical Constituents and Antioxidant Capacity of Green and Oolong Teas (Camellia sinensis) Manufactured in Thailand
Abstrak: Tea in Thailand most manufactured in northern area, especially Chiang Rai, Chiang Mai, Nan, and Mai Hang Son province. The aim of this study was to determine and compare the chemical compositions and antioxidant capacity of 4 important Thai tea products. A total of 13 of green teas of 2 major cultivars, assamicaand cv. oolong no.12 (chin hsuan oolong) and 26 of oolong tea of 2 major varieties, cv. oolong no. 12 and cv. oolong no. 17 (chin shin oolong) were collected from 18 factories in Chiang Rai province in 2011. The total polyphenol content was determined according to International Organization for Standardization (ISO 14502-1). For antioxidant capacity, DPPH radical scavenging activitiy assay and ferric reducing antioxidant power assay were determined. The catechins content and caffeine content were determined using HPLC by ISO method (ISO-14502-2). Results showed that about 95% of the 39 tea samples manufactured in Thailand had moisture content below 7%, 5% of tea samples being above 7%. The total polyphenol content in green tea was found to vary from 11.86 to 21.19%GAE, while in oolong tea was found in a range of10.22 to 17.57%GAE. The caffeine content in green tea samples were in a range of 1.69 to 3.7%, while in oolong tea samples were in a range of 1.61 to 3.26%. The catechin content in green tea samples were in a range of 8.31-14.08%, while in oolong tea samples were in a range of 6.81-12.46%. The antioxidant capacity in green tea samples was 164.01 mmole TE/100 g dry basis, while in oolong tea samples was about 132.73mmole TE/100 g dry basis. This study provided useful information for the tea industry in Thailand and other countries in processing and selecting a good-quality tea.
Keyword: Antioxidant capacity, Camellia sinensis, Green tea, Oolong tea, Thailand