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: Inokulasi Bakteri dan Fungi Mikoriza Arbuskula pada Semai Jabon (Anthocephalus cadamba (Roxb.) Miq) di Media Tanah Ultisol
Abstrak: Bacteria and AMF is a microorganisms that help increasing the plants growth. The purpose of this research is to test the effectiveness of bacteria isolates (Bacillus subtilis and Enterobacter hormaechei) and Arbuskula Mycorrhizal Fungi (AMF) in influencing plant growth on jabon (Anthocephalus cadamba Miq). This research is Complete Randomsized Design (CRD) with two factorial patterns which containts six combination treatment with five times replication. Showed that the interaction of the spores Gigaspora sp. interaction with both isolates of bacteria (Bacillus subtilis (M1B1) and Enterobacter hormaechei (M1B2)) have decreased the control of roots infection (M1B0), each of them is 20.25% and 36.21 %. In general the interactions spores of Gigaspora sp. with Enterobacter hormaechei (M1B2) has give a good response compared with the interaction spores of Gigaspora sp. with Bacillus subtilis (M1B1) with the parameter height, diameter, bud biomass and Seed Quality Index (SQI). The value increased (M1B2) of each is about 26.96%, 46.61%, 11.19%, 39.98% of the controls. The interaction of mychorrhizal and bacteria in general, significantly affect the jabon seedling growth. All of this has been proven by the increased of the control.
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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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