Judul: Penyimpanan Suhu Rendah untuk Mempertahankan Mutu Daun Pohpohan (Pilea melastomoides (Poir.) Wedd.)
Abstrak: “Pohpohan” leaf is one of leafy vegetables generally used for salads. “Pohpohan” is leafy vegetable belonging to easily damaged. Cold storage is one of the methods to maintain the freshness of “Pohpohan” leaf. The objective of this research was to analyze the quality change of cold stored “Pohpohan” leaf. The storing temperatures were 5°C, 15°C, and room temperature. Respiration rate, weight loss, moisture content, colour, tensile test, vitamin C test, TPC, and total soluble solids of all samples were measured during storage period. The result showed that cold storage could hold down the respiration rate, reduce the weight loss, maintaining the moisture content of the leaves, delay the leaves brightening, increase the total soluble solid, reduce the decrease of vitamin C content, and also reduce the content of microbes until the 6th day of storage. Storage temperature 5°C shows decrease in lower quality compared to the other temperature treatments.
Keyword: Bogor Agricultural University (IPB), low temperature, storage, pohpohan, quality

Judul: Pertumbuhan Setek Batang Pohpohan (Pilea trinervia Wight.) pada Umur Tanaman, Bagian Batang, dan Media Tanam yang Berbeda
Abstrak: Pohpohan (Pilea trinervia Wight.) is one of indigenous vegetables that grows in the mountain areas of West Java. Pohpohan in large quantities and in a short time can be done with cuttings of vegetative propagation, but it has not been developed at this time. The research was conducted at the Center for Tropical Horticulture Studies Experimental Field Tajur, Bogor, from January to July 2013. The research consisted of two experiments. The first experiment was to obtain the plant age of pohpohan that was good for the growth of stem cuttings pohpohan and the second experiment was to obtain the stem and growing media that was good for the growth of stem cuttings pohpohan. Treatment on first experiment was stem cutting pohpohan 3, 4, 5, and 6 months. Treatment of pohpohan 4 month showed the best of number of leaves and the increase of stem length. Stem cutting pohpohan 4 months on first experiment was gaved a treatment for second experiment, that was part of stem (tips, central, and base) and growing media (topsoil, rockwool, combination 1:1 of husk and compost, and vermicompost). There were 5 cuttings per treatment and 3 replications in this way a total was 720 cuttings. The experiment was laid out in Randomized Completely Block Design factorial.. The cutting pohpohan 4 month of stem tips were the best grown in husk and compost media with 11 number of leaves and 3.94 cm the increase of stem length. The cutting pohpohan of central stem were the best grown in husk and compost with 11 number of leaves and 2.67 cm the increase of stem length. The cutting pohpohan of base stem were best grown in husk and compost with 12 number of leaves and 2.38 cm the increase of stem length.
Keyword: rockwool, indigenous, husk, compost

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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