Judul: Isolasi dan identifikasi bacillus thuringiensis Berl. dari lahan pertanian
Abstrak: Dari 22 contoh tanah lahan pertanian daerah Lampung yang diperiksa, telah berhasil diisolasi 1683 isolat yang menunjukkan ciri-ciri Bacillus. Akan tetapi, pada pengamatan lekapan basah di bawah mikroskop kontras fase, hanya ditemukan 12 isolat (0.7%) bakteri pembentuk kristal protein. Kedua belas isolat tersebut berasal dari sembilan. contoh tanah. Semua isolat bakteri pembentuk kristal (p.k.p.) yang diperiksa berbentuk batang ramping, protein dengan spora berbentuk oval dan letaknya subterminal. Ada tiga macam bentuk kristal protein yang dijumpai, yaitu bipira- mida, romboid dan bulat. Isolat-isolat bakteri p.k.p. yang diperoleh diidentifikasi bersama-sama dengan 30 isolat bakteri p.k.p. yang berasal dari Sulawesi Tengah (merupakan hasil penelitian. terdahulu) secara serologis berdasarkan antigen flagelum- nya. Dari 42 isolat yang diuji, 20 diantaranya tergolong serotipe 17. Serotipe 17 ini merupakan serotipe yang paling banyak dijumpai, diikuti serotipe 15 (15 isolat), serotipe 6 dan 9 (masing-masing 2 isolat), serotipe 3, 5 dan 23 (masing-masing 1 isolat). Tidak ada korelasi antara serotipe dan bentuk kristal….
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Judul: Isolasi bacillus thuringiensis dari tanah pinggiran hutan dan toksisitasnya terhadap larva lepidoptera
Abstrak: Tujuan penelitian ini mengisolasi galur-galur asli thuringiensis dari tanah pinggiran hutan dan 8. mengetahui toksisitasnya terhadap larva berapa serangga sasaran. Sebanyak 20 contoh tanah sudah dikumpulkan dari pinggiran hutan daerah Pati dan Temanggung (Jateng), daerah Blitar (Jatim), daerah Maros, Bulukumba serta Soppeng (Sulsel). Dari contoh-contoh tanah tersebut telah diperoleh 1196 isolat yang menunjukkan ciri-ciri sebagai genus Bacziius, namun hanya enam (0.5%) di antaranya yang memperlihatkan pembentukan tubuh paraspora atau kristal. Keenam isolat tersebut berasal dari hanya lima (25%) contoh tanah, semuanya menunjukkan warna koloni putih, tetapi dengan bentuk tidak seragam. Morfologi kristalnya. berbeda, isolat MRS-C 2201(01), MRS-C 1103(01) dan BLK-C 2101(01) berbentuk bipiramida, MRS-C 2301(01) dan MRS-C 2401(03) bentuk bipiramida dengan ukuran yang lebih kecil dan MRS-C 2401(01) yang berbentuk amorf (tidak beraturan).
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Judul: The Effects of Variance of Interest rate to Variance of Annuity Future Values
Abstrak: Time value of money is a concept that refers to the difference of the value of money due to time difference. The value of money for present time would not be the same as the value of money in the future. The value of money for present time is called as Present Value (PV) of the money and the value of money for future time is called Future Value (FV) of the money. Determination the value of money, for present and future time, depends on the time and rate of return. The value of money is determined by several factors such as inflation, fluctuation of interest rates, and government policy in securities and taxation. Due to fluctuation of the value of money we need a FV formulation, it is useful for knowing whether an investment can be profitable or not, and this information is useful also in budget analysis. Annuity is defined as a series of payments made for a specific period. The payment, fixed or varied, can be made at the beginning or at the end of the period. Annuity paid at the beginning of the period is called annuity-due and annuity paid at the end of the period is called immediate annuity-certain. The accumulated value of the annuity after few years later is called as a final value or a future value. Burnecki et al. (2003) have discussed about the FV of a fixed-rate annuity in which payments are made according to the arithmetic or geometric series. They have also examined FV for annuities in which payments are made according to arithmetic or geometric series with random rates of interest. This paper examines FV for annuity-due in which payments are made according to arithmetic or geometric series with interest rates as a random variable, which is normal distribution ,  . Future value formula is expressed in recursive form. FV for annuity-due which payments are made according to the arithmetic or geometric series with random rates of interest is calculated by theoretical way and simulation way. The random rates of interest is denoted as k k i  i  , where k i an independent random variable; i is a constant and k  is a random variable which has normal distribution ,  . By using the determined parameters, a sequence of random rates of interest are generated for theoretical calculation. Meanwhile for the simulation, the random rates of interest is generated 1000 times for the simulation. The generated data give mean value, variance, and standard deviation. Moreover, error of mean value, variance, and standard deviation from the theoretical and simulation results are calculated. Error calculation uses Symmetric Mean Absolute Percentage Error (SMAPE). The smaller the value of SMAPE is the more accurate the simulation. The interest rate variances are varied from 0.000036 to 0.0001 to study the relationship between variance of rates of interest and variance of future value. The theoretical and simulation results show that when the variance of random rates of interest increases, then the variance of FV increases linearly. FV of the annuity-due in
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