Judul: Pertumbuhan dan Produksi Daun Torbangun (Plectranthus amboinicus Spreng.) dengan Pemupukan Organik dan Pemangkasan
Abstrak: Torbangun is a nutritious crop that increase breast milk because it contains lactagogen. Most study of torbangun plants focuses on pharmacological characteristics of plant. There is a need for research in cultivation techniques using organic fertilizer and pruning. The purpose of this study was to investigate the effect of organic fertilizer and pruning on the growth and leaf production of torbangun plant. This study used randomized block design (RBD) in the first experiment with fertilizer factor and Split plot design in the second experiment with fertilizer and pruning. Both of the experiment used Tukey‟s (Honestly Significant Difference) test. Organic fertilization is divided into 5 levels: without fertilizer, cow manure+rock phosphate, cow manure+rice-hull ash, rock phosphate+rice-hull ash, and cow manure+rock phosphate+rice-hull ash. Pruning is consisted of 2 levels: without pruning and with pruning. The results showed that fertilization using cow manure + rock phosphate + rice-hull ash increased shoot fresh weight of 125.21% compared to without fertilization. Pruning reduced plant biomass and leaf number. Torbangun growth is slow, so harvesting should have been done in a longer interval.
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Judul: Produksi Pucuk dan Kadar Metabolit Bangun-Bangun (Plectranthus amboinicus (Lour.) Spreng) dengan Pemupukan Organik dan Pemangkasan.
Abstrak: Bangun-bangun (Plectranthus amboinicus (Lour.) Spreng) has been used as breast milk stimulant (Lactagogue) by Bataknese people (especially mothers after childbirth) in Indonesia for hundreds of years. Bangun-bangun contains secondary metabolite i.e. polyphenol, saponin, glycoside, aromatic compounds, flavonoid and phenolic. No information was found on the effect of organic fertilizing and pruning on shoot production and metabolite content of bangunbangun therefore, the research about organic fertilizing and pruning were needed on shoot production and metabolite content of bangun-bangun to get standar operasional procedure (SOP) crop management of bangun-bangun. The objectives of the research was to investigate the effect of organic fertilizing and pruning on shoot production and metabolite compounds of bangun-bangun. Two field experiments had been conducted at the IPB experimental station (Bogor, Indonesia), under the shade of coffee tree with shade percentage of ± 35%. The first experiment was conducted in December 2012 – February 2012, whereas the second experiment was in March – May 2013. The first experiment was the first harvest cycle before pruning, whereas the second experiment was the second harvest cycle after pruning. The first experiment used three types of organic fertilizer i.e. cow manure (CM), rock phosphate (RP), and rice-hull ash (RH) (rate ha-1 for each treatment : 0 + 0 + 0; 12.3 t CM + 1.5 t RP + 0 RH; 12.3 t CM + 0 RP + 5.5 t RH; 0 CM + 1.5 t RP + 5.5 t RH; and 12.3 t PK + 1.5 t RP + 5.5 t RH. Each treatment was repeated three times. The second experiment was laid out in split plot design and the main plot was organic fertilizer, whereas sub plot was pruning. Pruning treatment was without pruning and pruning 25 cm above ground. Each treatment was repeated three times. The result showed that (1) Application of organic fertilizer resulted higher plant nutrient content (N, P, and K) than control, (2) Without harvesting, bangunbangun had slower growth than control, (3) Application of organic fertilizer without pruning gave higher growth and shoot production than control, (4) The decreased of rain intensity increased metabolite content, (5) Application of complete organic fertilizer gave higher metabolite production than control, (6) Pruning decreased metabolite content, (7) Bangun-bangun need to be fertilized organically and should not be pruned.
Keyword: Plectranthus amboinicus (Lour.) Spreng, secondary metabolite, phenylalanine ammonia lyase,, phenolic, anthocyanin

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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