Judul: Pengembangan Lemna Minor L. Berdasarkan Dosis Pemupukan Secara Continous Culture
Abstrak: Tanaman air Lemna minor L. adalah tanaman yang tumbuh mengapung di atas air dengan tingkat penyebaran yang sangat luas dan potensial sebagai sumber hijauan pakan yang berkualitas tinggi bagi ternak. Penelitian ini bertujuan untuk mendapatkan teknik budidaya yang optimal Lemna minor L. berdasarkan dosis pemupukan melalui penerapan prinsip continous culture yang terbagi kedalam dua tahap perlakuan. Tahap 1 terdiri dari dua perlakuan media, media hoagland (25.2 ml l-1 media) dan kompos (12.5 g l-1 media), sedangkan tahap kedua dilakukan penanaman Lemna minor L. Media yang sudah ditambahkan tiga dosis penambahan pupuk (0%, 50% dan 100%) dengan masing-masing perlakuan 5 ulangan. Parameter yang diukur adalah nilai pH, suhu, luas cover area, penyusutan media, doubling time cover area dan anakan, produksi biomassa, bahan kering dan abu. Percobaan ini dianalisis menggunakan rancangan acak lengkap. Hasil berdasarkan dosis penambahan melalui penerapan prinsip continuous culture menunjukkan bahwa produktivitas yang tinggi tanaman Lemna minor L. selama 28 hari pada media hoagland tingkat 0% (tanpa penambahan hoagland) sehingga tidak membutuhkan penambahan hoagland.
Keyword: continous culture, dosis pemupukan, hoagland, kompos, Lemna minor L

Judul: Produktivitas Lemna minor L. dan Salvinia molesta Mitchell. pada Berbagai Media Tumbuh
Abstrak: Aquatic plants such as Lemna minor L. and Salvinia molesta Mitchell. were potential as feed for animal. Lemna minor L. and Salvinia molesta Mitchell. can be used as an alternative for poultry and ruminant feed. Those plants could grow well in the tropical climate. This research aims to evaluate productivity of the various of growth media and to obtain the optimal production of Lemna minor L. and Salvinia molesta Mitchell. cultivation which divided into 5 treatment with 5 replication respectively. Treatment that used in this research are control, hoagland, hyponex, compost and NPK. The parameters that analyzed in this study were total nitrogen, pH value, cover area, decrease of media volume, biomass production, dry matter, ash, organic matter, and productivity potential of Lemna minor L. and Salvinia molesta Mitchell. The research data were analyzed with a completely randomized design. The result of this study indicates that hoagland media and compost are the optimal medium for the growth of Lemna minor L. while Salvinia molesta Michell. in hoagland media
Keyword: productivity, Salvinia molesta Mitchell., media, Lemna minor L

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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