Judul: Karakterisasi Berbagai Aksesi Meniran (Phyllanthus niruri L.), Studi Perkecambahan dan Pematahan Dormansi.
Abstrak: This research aims to characterize some accession meniran, get information about seed viability of meniran and methods germination test of meniran. This research was conducted from February 2012 to June 2012. The accession of Phyllanthus niruri L. that used in this research are come from Gresik, Jember, Kebon Kalapa, Leuwikopo and accession come from Semplak. The research consists of three experiments. The first experiment to characterize meniran. Experimental design used is a Randomized Blok Design (RKLT) by a factor that is accession. A second experiment to see the effect of pre-germination on the viability meniran. The data obtained were tested by t test. The third experiment get information about methods of germination test meniran. The data obtained were tested by t test. The results of the research showed that characters of Phyllanthus niruri L is devided in to three main grouped, where the degree of similarity 45.21% Jember accession separately from the other accessions. Differences accession Jember prominent than the other accessions in character fruit color (red), branch color (red-purple), while the other accessions green. At the rate of 77.63% similarity, there are Gresik and Semplak in one group and Kebon Kalapa, Leuwikopo, Sawah Baru in other group that has highest production of biomass. Seed soaking treatment with water and 250 ppm IAA gives the same effect as no treatment on the viability various accession meniran. Value germination pre soaking seed treatment with GA3 influence was significantly higher when compared with the value of germination without treatment, seed treatment with 250 ppm GA3 increase seed viability meniran, increased viability seen from the increase to grow the seed, grow the seed in which the value of 49.7% (without treatment) increased to 79.0% (GA3 soaking treatment). Meniran seed germination in the nursery with soil mixed media manure with a ratio of 1:1 has has the higher average value of the maximum growth when compared with germination in laboratory test methods. In this research, the test method in the form of laboratory test methods and UDK ½ UKDdp with or without pre-germination of GA3 250 ppm, not to be able to represent the corresponding germination potential of the seeds germinated in the nursery.
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Judul: Karakterisasi aksesi Meniran (Phyllanthus sp.) koleksi Pusat Studi Biofarmaka IPB
Abstrak: Meniran (Phyllanthus niruri L. dan Phyllanthus urinaria L.) dikenal sebagai gulma dengan daerah okupasi yang luas. Meniran mengandung bahan-bahan aktif yang memiliki khasiat pengobatan diantaranya sebagai antibakteri, hepatoprotektif, dan antidiuretik. Penelitian ini dilakukan untuk mengarakterisasi 14 aksesi meniran hasil eksplorasi yang telah dikonservasi di kebun Pusat Studi Biofarmaka IPB. Karakterisasi dilakukan berdasarkan karakter morfologi, agronomi, dan anatomi. Pelaksanaan penelitian dimulai dari penyemaian, pindah tanam (5 MST), pemeliharaan, dan pengamatan (sejak pindah tanam). Data kuantitatif hasil karakterisasi diuji dengan nilai t-student, selanjutnya data kuantitatif dan kualitatif diuji dengan analisis gerombol untuk memperoleh informasi tingkat kemiripan antar-aksesi dan jumlah gerombol yang dibentuk. Hasil uji-t menunjukkan bahwa faktor aksesi memiliki pengaruh nyata terhadap seluruh karakter agronomi dan anatomi yang diamati. Dendogram hasil analisis gerombol menunjukkan pada tingkat kemiripan 61%, aksesi-aksesi meniran terbagi menjadi 4 gerombol. Grup A terdiri dari aksesi Sawahan 1, Kandang Jati 3, Sumedang 3, dan Balittro. Grup B terdiri dari aksesi Sumedang 4, Bontang, Jember, Cikabayan 1, dan PSB 1. Grup C terdiri dari aksesi Madiun, Pati, Ciampea 2, dan Sawahan 2. Grup D hanya diisi oleh aksesi PSB 2.
Keyword: accession, dendogram, characterizationconservation, Phyllanthus sp

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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