Judul: Evaluasi keragaan karakter dua lanras kacang bogor (Vigna subterranea (L.) Verdcourt) pada dua lingkungan tumbuh berbeda
Abstrak: Kacang bogor merupakan legume sumber karbohidrat yang dapat dikembangkan menjadi tanaman pangan baru. Penelitian ini bertujuan untuk mengevaluasi keragaan karakter dua lanras kacang bogor yang ditanam pada dua lingkungan tumbuh berbeda. Kedua lanras tersebut didapatkan dari petani yang ada di Sumedang dan Sukabumi. Penelitian dilaksanakan di Kebun Percobaan Leuwikopo Kampus IPB Darmaga dari bulan Juni hingga Oktober 2010. Setiap tanaman dijadikan satu satuan amatan. Setiap lanras ditanam pada dua lingkungan dengan dosis pemupukan berbeda, sehingga terbentuk empat populasi berbeda. Karakter yang diamati meliputi lebar kanopi, panjang tangkai, jumlah cabang, jumlal buku, panjang ruas, jumlah polong per tanaman, bobot polong basah per tanaman dan bobot polong kering per tanaman. Hasil uji nilai tengah menunjukkan bahwa lanras Sumedang di lingkungan marjinal memiliki potensi untuk dikembangkan berdasarkan karakter lebar kanopi, jumlah cabang, jumlah buku, bobot polong basah dan bobot polong kering. Pada lanras Sukabumi, tanaman pada lingkungan marjinal memiliki potensi untuk dikembangkan berdasarkan karakter jumlah polong dan tanaman pada lingkungan optimal memiliki potensi untuk dikembangkan berdasarkan karakter panjang tangkai daun dan panjang ruas. Hasil analisis korelasi antar karakter, menunjukkan bahwa karakter vegetatif yang konsisten berkorelasi positif dengan hasil adalah lebar kanop dan jumlah buku.
Keyword: Canopy width, Correlation, Marginal, Sukabumi, Sumedang

Judul: Evaluasi Keragaan Karakter Dua Lanras Kacang Bogor (Vigna subterranea (L.) Verdcourt) pada Dua Lingkungan Tumbuh Berbeda.
Abstrak: Bambara is legume carbohydrate source which can be developed into new crop. The objective of this experiment was to evaluate the characters of two landraces bambara groundnut in two different growing environments. The two landraces were obtained from farmers in Sumedang and Sukabumi. The experiments were conducted at Leuwikopo, IPB Darmaga, from June - October 2010. Each plant used as a unit of observation. Each landraces is planted on two environment with different fertilizer dosage, thus forming four different populations. The characters observed were width of canopy, stem length, number of branches, number of nodes, internode length, number of pods, weight of fresh pods/plant and weight of dry pods/plant. Result showed Sumedang landraces in the marginal environment has the potential to be developed based on width of canopy, number of branches, number of node, weight of fresh pods, and weight of dry pods. In Sukabumi landrace, crops in marginal environment has the potential to be developed based on number of pods and crops in optimal environment has the potential to be developed based on petiol length character and internodes length. Result of correlation analysis between the characters, the vegetative characters which consistent positively correlated with the crop yield are the width of canopy and number of nodes.
Keyword: canopy width, correlation, marginal, sukabumi, sumedang

Judul: Synthesis of Apatite - Chitosan Composite Using Duck Eggshell and Chitosan with Temperature and pH Control
Abstrak: Composite of apatite-chitosan was prepared by using chitosan as polymer matrix. Calcium phosphate was prepared from CaO and (NH4)2HPO4, which the ratio Ca : P had to be 1.67. Chitosan is produced by deacetilase from biopolymer chitin. Duck eggshell (95% CaCO3) as starting material was converted to be calcium oxide (CaO) through calcinations with temperature 1000oC for 5 hours. In-situ and ex-situ methods were prepared from apatite and chitosan (dissolved with acetate acid 2%). Calcium phosphate prepared for bone implantation, but it is too fragile and brittle to be implant into the body. So addition of chitosan can decrease crystalinity and increase mechanic characteristic (tougher). Composite apatite-chitosan was resulted by fast precipitation. Fast precipitation was held in a breaker glass with nitrogen atmosphere, under controlled temperature at 37oC and pH 7, in order to increase amount of hydroxyapatite. Precipitation with CaO which was dropped by (NH4)2HPO4. Hydroxyapatite and chitosan were appearing at samples with in-situ and ex-situ methods which indicating by peak matching of XRD (closed lattice parameter, crystal size), overlapping at FTIR spectra and supporting by SEM picture (homogenous and agglomerated particle). However, it still needs further research to examine biocompatibility osteoconductive degree of sample by in-vivo and in-vitro test.
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