Judul: Aktivitas selulase bacillus pumilus galur 55 yang diisolasi dari sumber air panas
Abstrak: Selulosa merupakan senyawa polisakarida yang paling banyak terdapat di alam, tetapi penggunaanya sangat sedikit, karena selulosa hanya dapat dicerna oleh makhluk hidup kelompok ruminansia (sapi, kerbau, domba). Manusia tidak dapat mencerna selulosa karena tidak memiliki mikroorganisme yang dapat mencerna selulosa di dalam saluran pencernaanya. Selulosa dapat digunakan sebagai bahan pakan dan pangan apabila telah diubah menjadi glukosa atau oligosakarida.
Keyword: 

Judul: Aktivitas enzim karboksimetil selulase bacillus pumilus galur 55 pada berbagai suhu inkubasi
Abstrak: Polisakarida yang paling banyak terdapat di dalam tanaman adalah selulosa, tetapi selulosa kurang begitu dimanfaatkan karena sulit dicema kecuali makhluk hidup keiompok ruminansia. Selulosa sebenamya dapat dimanfaatkan sebagai bahan pangan dan pakan apabila telah diubah menjadi glukosa atau oligosakarida. Pada penelitian ini selulosa dihidrolisis secara hayati dengan menggunakan Bacillus pumilus galur 55 yang diisolasi dari sumber air panas di daerah Sikumbang Jawa Tengah yang dapal mensekresikan enzim selulase untuk mendegradasi selulosa menjadi glukosa atau oligosakarida. Penelitian ini bertujuan mengetahui kondisi suhu inkubasi baik suhu dalam produksi enzim selulase oleh B. pumifus galur 55 (suhu fermentasi) dan suhu analisis untuk mendapatkan aktivitas karboksimetil selulase (CMC-ase) yang optimum. untuk mengetahui konsentrasi substrat yang optimwn dalam produksi enzim selulase, dan juga untuk mengetahui sifat termofil mikrob B. pumilus serta sifat enzim yang dihasilkan. Mikrob B. pumifus galur 55 ditumbuhkan pada medium spesifik selulolitik untnk menghasilkan enzim selulase dengan konsentrasi substrat jerami padi (JP) 1, 2, dan 3% dengan suhu fennentasi 40, 45, 50, 60, dan 70°C. Pengukuran aktivitas CMC-ase dilakukan dengan menggunakan metode DNS (asam-3,5-dinitrosalisilat) dengan variasi suhu inkubasi 40, 50, 60, dan 70°C. Untuk pengukuran kadar protein digunakan metode Lowry. Kondisi fermentasi yang optimum dalam produksi enzim selulase didapatkan pada suhu fennentasi 50°C dengan konsentrasi JP 3% dan suhu inkubasi uotuk mendapatkan aktivitas CMC-ase optimwn, yaitu pada suhu 50°C dengan aktivitas sebesar 51,914 Ulml. Selain itu diketahui bahwa B. pumilus galur 55 merupakan mikrob dengan suhu lingkungan hidup pertumbuhan
Keyword: 

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
Keyword: