Judul: Pertumbuhan Anggrek Phalaenopsis amabilis pada Perlakuan Chitosan dan Asam Salisila
Abstrak: Phalaenopsis orchid plant vegetative growth is influenced by environmental condition such as light, temperature, and humidity. Certain organic material affected on the growth, development and plant resistance to pests and diseases, including chitosan and salicylic acid. The objective of this research was to test the application of organic compound chitosan and salicylic acid on the growth of Phalaenopsis amabilis. This research was arranged in a randomized completely design with organic compound as a single factor. There were six treatment, 3 ppm chitosan, chitosan 6 ppm, 5 ppm salicylic acid, salicylic acid 10 ppm and 3 ppm chitosan + 5 ppm salicylic acid. Each treatment was repeated five times with 3 plantlets per bottle. Organic compound were mixed in ½ MS in vitro medium and planlets were transfered to the treatment medium and cultured in the tissue culture laboratory for four weeks. Planlets subsequently were acclimatizated to spaghnum ii moss medium in greenhouse. Treatment were continued by spraying of organic compound to planlets every two weeks. The results of the experiment showed that the best treatment of organic compound, was chitosan 3 ppm. This is showed by length of youngest leaf and percentage growth of plant on treatment of chitosan 3 ppm.
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Judul: Keragaman morfologi dan pertumbuhan populasi tanaman Phalaenopsis hasil persilangan pada beberapa perlakuan pemupukan dan pemberian Chitosan
Abstrak: Pertumbuhan vegetatif dan generatif tanaman anggrek Phalaenopsis dipengaruhi oleh kondisi lingkungan dan cara budidaya diantaranya dosis pupuk. Penelitian ini bertujuan untuk mengetahui analisis keragaman morfologi dan pengaruh pemupukan dan aplikasi chitosan terhadap pertumbuhan dua populasi anggrek Phalaenopsis hasil persilangan. Penelitian dilaksanakan di Cipanas, kabupaten Cianjur pada bulan Februari hingga Juni 2015. Percobaan ini menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan faktor tunggal yaitu perlakuan pemupukan. Terdapat empat perlakuan yaitu NPK 20:20:20 2 g l-1, NPK 6:20:20 2 g l-1, NPK 20:20:20 2 g l-1 + chitosan 1.5 ppm, dan NPK 6:20:20 2 g l-1 + chitosan 1.5 ppm. Setiap perlakuan terdiri tiga ulangan. Setiap ulangan terdiri dari 5 tanaman. Hasil penelitian menunjukkan bahwa keragaman morfologi pada populasi 1102 dan 1103 membentuk beberapa klaster dengan agglomerative coefficient pada populasi 1102 berada pada jarak euclidius sebesar 0.37 sedangkan populasi 1103 berada pada jarak euclidius sebesar 0.39. Pupuk NPK 20:20:20 2 g l-1 berpengaruh nyata pada panjang daun tanaman anggrek populasi 1102. Perlakuan empat jenis pemupukan termasuk dengan kombinasi chitosan memberikan pengaruh yang sama pada lebar, tebal, dan jumlah daun. Perlakuan NPK 20:20:20 2 g l-1 dan 6:20:20 2 g l-1 pada populasi 1103 menunjukkan presentase tanaman berbunga paling tinggi.
Keyword: Phalaenopsis, fertilization, Chitosan, characterization, flowering

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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