Judul: Cendawan dan bahan kimiawi sebagai formula inokulan penginduksi gaharu
Abstrak: This research was carried out to investigate the effect of salicylic acid 0,1 mM and methyl jasmonate 0,75 mM on Acremonium sp. (IPBCC 08.566, IPBCC 07.525) and Fusarium sp. (IPBCC 08.568, IPBCC 08.569 and IPBCC 08.570) growth in vitro and in form of inoculant formulation. Acremonium sp. or Fusarium sp. (diam. 5 mm) were first grown on PDA side by side with filter paper (diam. 5 mm), containing 1 mL salicylic acid 0,1 mM or methyl jasmonate 0,75 mM. The diameter of the colony and total conidial density was observed every two days until the colony reached the edge of the Petri dishes. Chemical that has no influence on Acremonium sp. and Fusarium sp. growth, were studied to evaluate its posibility to form pellet with sawdust mixture. The ability of Acremonium sp. and Fusarium sp. to grow after formulated in form pellet is assessed on PDA. In vitro experiment showed that salicylic acid 0,1 mM or methyl jasmonate 0,75 mM did not effect the mycelial growth and conidial production of all isolate. Eventhough salicylic acid 0,1 mM slighly stimulated conidial production Fusarium sp. IPBCC 08.568 (about 1,005x control). Viability of Acremonium sp. or Fusarium sp. in pellet with salicylic acid 0,1 mM or methyl jasmonate 0,75 mM and 750 mM was about 85-95,8% and were not significantly different from the control that were about 90-96,6%. Whereas all the fungi in pelet that was mixed with salicylic acid 100 mM did not grow so as to be regarded as not viable.
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Judul: Pengaruh inokulasi cendawan mikoriza arbuskula(CMA) terhadap pertumbuhan semai beberapa provenans acacia(Acacia mangium Willd)
Abstrak: Dalam rangka memenuhi kebutuhan kayu yang semakin meningkat, pemerintah menggalakkan pembangunan HTI yang diprioritaskan pada areal tanah kosong yang berupa alang-alang, semak belukar, hutan rawang maupun pada kawasan hutan yang kurang produktif. Salah satu jenis tanaman yang diprioritaskan untuk pembangunan HTI adalah Acacia mangium. Yang merupakan salah satu jenis Leguminosae yang mempunyai sifat toleransi edafis yang cukup tinggi dan mampu mengadakan simbiosis mutualisme dengan Cendawan Mikoriza arbuskula (CMA) sehingga dapat memacu pertumbuhan tanaman dan meningkatkan daya hidupnya di lapangan. Selain itu jenis ini mempunyai bebarapa keunggulan antara lain mempunyai pertumbuhan yang cepat, tajuknya dapat segera menutup permukaan tanah pada umur yang relatif muda sehingga mampu menekan pertumbuhan alang-alang atau tumbuhan bawah lainnya dan kayunya dapat digunakan sebagai kayu pertukangan maupun bahan baku industri pulp/rayon. Penelitian ini bertujuan untuk menentukan isolat CMA yang paling efektif terhadap pertumbuhan masing-masing provenans Acacia mangium Willd, mengamati respon pertumbuhan beberapa provenans Acacia mangium Willd. akibat inokulasi CMA. Penelitian ini dilaksanakan di rumah kaca dan Laboratorium Endomikoriza PT INAGRO Parung dan Laboratorium Mikrobiologi dan Biokimia Sub Laboratorium Endomikoriza Pusat Antar Universitas Bioteknologi Institut Pertanian Bogor. Penelitian dimulai pada awal bulan Maret hingga akhir bulan Oktober 1997. Bahan-bahan yang digunakan dalan penelitian ini terdiri dari benih Acacia mangium Willd., zeolit, CMA inokulum, larutan staining dan destaining. Alat-alat yang digunakan meliputi bak tabur, pot plastik, oven, mikroskop,jangka sorong, mistar, saringan, pinset, cawan petri, alat pengambil akar, alat timbangan, kamera, tabung reaksi, gelas preparat dan gunting. Metode penelitian yang digunakan adalah, persiapan media tabur dan media sapih, perkecambahan benih, penyapihan dan inokulasi CMA. Inokulum CMA yang digunakan adalah Etinocatum (Str-Et), Gigaspora (Ya.Gi), Acaulospora (INDS-5), Glomus manihotis (INDS-29), Glomus Small Brown (INDS-40) dan campuran Gigaspora dan Glomus manihotis (Bre-X). Pemberian inokulum CMA pada masing- masing pot adalah sebanyak 30 gram. Parameter yang diamati dan diukur adalah tinggi semai, diameter semai, berat kering total semai, persen infeksi pada akar dan rasio pucuk akar. ...
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Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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