Judul: Studi perbanyakan jarak pagar unggul (Jatropha curcas L.) secara in vitro melalui lintasan organogenesis dan embriogenesis
Abstrak: Penelitian ini bertujuan untuk memperoleh konsentrasi zat pengatur tumbuh dan jenis eksplan yang tepat, yang berpotensi untuk menginduksi organogenesis dan embriogenesis jarak pagar in vitro. Kegiatan penelitian secara keseluruhan terdiri atas tiga percobaan yaitu : (1) organogenesis in vitro pada kotiledon dan hipokotil tanaman jarak pagar; (2) Induksi organogenesis dari stek batang dan daun tanaman jarak pagar, dan (3) Studi perbanyakan masal jarak pagar secara in vitro melalui lintasan embriogenesis somatik.
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Judul: Perbanyakan Tanaman Jarak Pagar (Jatropha curcas) melalui Stek Buku Tunggal secara In Vitro
Abstrak: Jatropha curcas was known as an alternative source of biodiesel to complement fossil fuel. In vitro multiplication can produce seeds of J. curcas in high amount and uniformed. The aim of this research was to find the combination of plant growth regulators (PGR) to stimulate physic nut growth from single node cuttings in vitro to produce shoots and roots. This research was designed in group randomized with 16 combinations of initiation and multiplication treatment. Concentrations of IAA in the initiation and multiplication media were 0; 0.01; 0.05; 0.10 mg/l whereas concentrations of BAP were 0; 0.10; 0.50; 0.80 mg/l. 80-100% explants gave shoots within 7-10 days. Concentrations of IAA in rooting treatment were 0; 0.10; 0.50; 1.00 mg/l. 325 buds were subcultured to rooting media after 4-8 weeks; 6.46% of them initiated roots in 22-60 days after subcultured. IAA 0.10 mg/l and BAP 0.80 mg/l stimulated multiple shoots, whereas 0.10 mg/l of IAA in rooting media stimulated root formation.
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Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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