Judul: Identifikasi Bakteri secara Molekuler pada Lobster Air Tawar Procambarus clarkii (Girard, 1852) di Caringin, Sukabumi, Jawa Barat.
Abstrak: Procambarus clarkii merupakan krustasea asli dari Meksiko Utara dan utara ke selatan Amerika. Pemeliharaan P. clarkii sangat mudah sehingga lobster tersebut telah terdistribusi ke berbagai negara. Keberadaan lobster P. clarkii di perairan Jawa Barat dikhawatirkan membawa penyakit di lingkungan perairan yang berdampak pada biota asli. Oleh sebab itu penelitian ini dilakukan untuk mengidentifikasi bakteri pada hemolimfa dan hepatopankreas lobster P. clarkii secara molekuler dengan menggunakan marka genetik 16S rRNA di Caringin, Sukabumi, Jawa Barat. Bakteri diisolasi pada media selektif Rimler Shotts (RS) dan blood agar (BA). Identifikasi jenis bakteri dilakukan berdasarkan karakter morfologi dengan metode pewarnaan Gram, uji biokimia, analisis kepadatan bakteri (CFU/ml), dan validasi dengan berdasarkan sekuen gen 16S rRNA. Hasil menunjukkan bahwa lobster P. clarkii teridentifkasi 14 bakteri. Identifikasi secara molekuler lebih akurat dan dapat diketahui hingga tingkat spesies.
Keyword: 16S rRNA, bakteri, krustasea, Procambarus clarkii

Judul: Hubungan Kekerabatan Lobster Air Tawar (Procambarus clarkii Girard, 1852) berdasarkan Marka Gen 16S rRNA di Jawa Barat.
Abstrak: Procambarus clarkii dikenal sebagai Red swamp crayfish yang merupakan salah satu kelompok lobster air tawar dan termasuk kategori spesies invasif. Penelitian ini bertujuan untuk menentukan hubungan kekerabatan lobster air tawar (P. clarkii) menggunakan marka gen 16S rRNA dari beberapa lokasi di Jawa Barat. Penelitian ini dilaksanakan pada bulan Februari hingga April 2018. Lobster diambil sebanyak 10 contoh dari masing-masing lokasi Caringin, Sawangan, Parung, Laladon, dan Panaragan. Isolasi dan ekstraksi DNA menggunakan prosedur manual kit komersial Gene Aid lalu dilanjutkan ke tahap sequencing. Analisis data untuk mensejajarkan urutan basa nukleotida menggunakan software MEGA 5.0. Tahap amplifikasi menggunakan marka gen 16S rRNA. P. clarkii yang berasal dari Caringin, Sawangan, Parung, Laladon, dan Panaragan terdapat dalam satu unit populasi yang sama. Species origin P. clarkii dari kelima lokasi observasi diduga berasal dari Amerika yang ditunjukkan dengan jarak genetik yang kecil sebesar 0,3%. Hubungan kekerabatan P. clarkii yang berada di Jawa Barat sangat dekat. Terdapat hanya satu situs nukleotida spesifik pada gen 16S rRNA spesies P. clarkii yang menujukkan bahwa spesies ini bersifat sangat adaptif.
Keyword: lobster rawa merah, PCR, pohon filogeni, Cryfish

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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