Judul: Indentifikasi bibit asal biji dan bibit klonal durian (Duria zibethina Murray) berdasarkan ciri morfologi bagian vegetatif
Abstrak: Penelitian bertujuan mengidentifikasi bibit asal biji durian lokal Bogor varietas Entin, Koclak, Pagar, dan Mentega, mengidentifikasi bibit klonal durian dengan batang atas varietas unggul nasional yang diokulasikan dengan varietas lokal berdasarkan ciri morfologi bagian vegetatif, serta mengetabui pertumbuhan tunas baru setiap varietas yang diokulasikan. Penelitian dilakukan di kebun percobaan IPB, Baranangsiang Bogor. Penelitian menggunakan bibit durian asal biji varietas Entin, Koclak, Pagar, dan Mentega sebagai batang bawab serta Hepe, Monthong, Entin, Koclak, Pagar, dan Mentega sebagai batang atas. Jumlah masing-masing varietas batang bawab yang diokulasi dengan setiap varietas batang atas ialah sebanyak 35 buah bibit. Okulasi yang dilakukan menggunakan metode patch budding. Ciri morfologi yang diamati ialab bentuk mabkota bibit, sudut percabangan, warna batang utama, distribusi cabang, bentuk daun, bentuk ]ekukan ujung daun, bentuk lekukan pangkal daun, urat tulang daun, wama permukaan atas daun, warna permukaan bawab daun, permukaan antar tulang daun, dan lengkung daun. Analisis yang dilakukan adalab penelusuran kehomogenan dengan uji khi-kuadrat, sedangkan pembentukan gerombol varietas dilakukan dengan menggunakan analisis gerombol (cluster analysis) berdasarkan ciri morfologi setiap varietas. Analisis komponen utama (principal component analysis) dilakukan untuk mengetabui ciri yang dapat dijadikan pembeda antar varietas serta menentukan posisi varietas pada diagram pencar. Penentuan komponen utama diwakili oleh keragaman keseluruhan data minimal 75%. Untuk mengetabui pengaruh batang bawab dan batang atas dilakukan analisis ragam faktorial rancangan acak lengkap. Uji lanjut dengan menggunakan analisis Duncan.
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Judul: Analisis Keragaman Beberapa Genotipe Durian (Durio zibethinus Murr.) Menggunakan Penanda Morfologi dan Molekuler (ISSR).
Abstrak: Indonesia is one of the durian diversity center. Evaluation and characterization activities should be conducted to identify the genotipes in order to differentiate the individual plant in the spesies. Genetic variation of 21 collected genotipes of Indonesia Agency for Agricultural Research and Development (IAARD) Cipaku orchard, Bogor was evaluated using morphological and Inter Simple Sequence Repeat (ISSR) markers. Variability analysis based on 22 morphological characters gained 64 (100%) polymorphism. Molecular analysis using ten primers of ISSR amplified 48 locus. The 39 locus (81.25%) were polymorphic and the 9 locus (18.75%) were monomorphic, respectively. Both of the markers have different clustering, therefore they should be analysed using Joint Analysis. The result of the study showed genetic variability among 21 genotipes was grouped into 2 clusters on 0.51 similarity coefficient. The first group (A) consisted of the genotipe from Indonesia and the second group (B) consisted of Kanjau genotipe from Thailand with matrix correlation value was 0.83. Kanjau genotipe was suggested as a candidate in durian breeding programme, in order to increase Indonesian durian value in the future.
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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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