Judul: Kajian Morfologi Mikrokapsul Anti Escherichia coli pada Berbagai Rasio Kolostrum/Alginat dan Suhu Penyimpanan.
Abstrak: Tujuan dari penelitian ini adalah mengevaluasi morfologi mikrokapsul yang mengandung IgG anti Escherichia coli dengan berbagai rasio kolostrum : alginat dan suhu penyimpanan yang berbeda. Mikrokapsul dibagi ke dalam 3 kelompok yang dibedakan berdasarkan perbandingan komposisi kolostrum (K) dengan alginat (A) (P1, rasio K-A 1:4; P2, rasio K-A 1:1.5; dan P3, rasio K-A 2:3). Mikrokapsul disimpan pada suhu ruang (RT) dan refrigerator (4°C) selama delapan minggu. Pengamatan dilakukan terhadap morfologi (diameter) mikrokapsul menggunakan mikroskop dengan lensa okuler berskala. Hasil pengamatan menunjukkan bahwa mikrokapsul dapat disimpan pada suhu 4o C tanpa adanya kontaminasi selama 8 minggu penyimpanan. Mikrokapsul yang disimpan pada suhu ruang hanya mampu bertahan tanpa kontaminan hingga 3 minggu masa penyimpanan. Morfologi (ukuran diameter) mikrokapsul dengan rasio kolostrum berbanding alginat sebesar 3:7 (P2) relatif stabil dibandingkan dengan morfologi mikrokapsul dengan rasio kolostrum berbanding alginat sebesar 1:4 (P1) dan 2:3 (P3) pada suhu penyimpanan 4o C dan suhu ruang.
Keyword: Escherichia coli, kolostrum sapi, mikrokapsul, morfologi

Judul: Evaluasi morfologi mikrokapsul tersalut alginat-kitosan yang mengandung IgG anti-Escherichia coli asal kolostrum sapi
Abstrak: The objective of this experiment was to evaluate the morphology of alginatechitosan coated microcapsule consist of anti E. coli IgG derived from bovine colostrum. Pure IgG anti E. coli were obtained from colostrum collected from cows vaccinated by polyvalent E. coli vaccine. The IgG were purified and packed in form of alginate chitosan coated microcapsule. The microcapsules were made by extruction method, using Microencapsulator with 30 and 60 minutes coating time in chitosan, respectively. Microcapsules then be evaluated by using Scanning Electron Microscope. Results of the experiment indicated that there was no significant different in the formation of microcapsules between 30 and 60 minutes coating time. The microscopic evaluation has indicated the smoother surface of microcapsules coated in 60 minutes . In conclusion, the IgG microcapsules with the 60 minutes coating time better than of those coated in 30 minutes.
Keyword: Bogor Agricultural University (IPB), SEM, chitosan, alginate, micrcapsule, IgG, colostrum

Judul: Real Option Valuation Using Binomial Decision Trees.
Abstrak: A firm that decides to invest has a choice to invest in real assets. A method which is usually used in valuation of the project is discounted cash flow (DCF) method. But, this method can’t be used in projects that account for value of managerial flexibility, such as decision to suspend operations temporarily. Therefore, this kind of project needs to be assessed using real option. Real option valuation can be done in some ways, including the use of path-dependent simulation, as well as closed-form models like Black-Scholes model, partial differential equation, and binomial or multinomial approaches. In this paper, real option valuation using binomial decisions id discussed. Determination of the project value can be done in three steps. First, calculate the expected present value of the project. Next, calculate volatility of the project using Monte Carlo simulation. Last, construct a binomial tree to model the dynamics of the project value using the parameters of the stochastic process, and then add some decision nodes to model the project’s real options.
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