Judul: Kandungan karbon nitrogen dan inisiasi meristem floral sebagai penciri jenis kelamin bunga tanaman jarak pagar (jatropha curcas)
Abstrak: Physic nut (Jatropha curcas) generally is monoecious plant. However, very rarely occurs the andromonoecious and trimonoecious plant. Analysis of sex flowers are needed to determine the relationship with physiological factors such as the content of carbon organic and nitrogen. The aim of this study was to analyze flower sex marker through carbon organic and nitrogen content and initiation floral meristem in physic nut (Jatropha curcas). The plants were observed are trimononoecious plant from the hermaphrodite flowers, trimonoecious plant from female flowers, and andromonoecious plant. The result showed that initiation of floral meristem became floral meristem have flower organ. The highest carbon organic and nitrogen content were trimonoecious plant from female flower, on the same time, it was in generative phase.
Keyword: Bogor Agricultural University (IPB), trimonoecious., nitrogen, C organic, Andromonoecious

Judul: Kandungan Zat Pengatur Tumbuh Daun dan Pola Infloresen Bunga pada Jarak pagar (Jatropha curcas L.) Andromonoecious
Abstrak: Jatropha curcas is a monoecious plant with separated male and female flowers. However, there is also andromonoecious Jatropha plant that produce hermaphrodite and male flowers. One of the internal factors controlling reproductive phase is Plant Growth Regulators (PGRs). Addition of PGRs could optimize vegetative and reproductive phase. The aims of this study were to analysis the content of leaf auxins, gibberellins, and cytokinins, as well as flower inflorescense pattern on andromonoecious Jatropha curcas under PGR treatments. PGRs IAA, GA3, and kinetin was sprayed to leaves every two weeks until two months before flowering. PGR analysis was performed using extraction and spectrophotometric methods. The content of auxins and gibberellins in monoecious Jatropha were higher when was analyzed before flowering than that of after flowering, whereas the content of sitokinin on monoecious plant was lower before flowering than that of after flowering. Auxin and sitokinin content in non treated andromonoecious increased after flowering. whereas gibberellins content decreased. Treatment of 100 ppm auxin and giberellin to the andromonoecious Jatropha could increase the content of PGR endogenous. Kinetin increased number of flower inflorescense on andromonoecious Jatropha.
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Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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