Judul: Sudoku Tereduksi dan Grup Simetri Sudoku
Abstrak: Sudoku is a logic game in form of square games consisting rows, columns and mini grids. In this game, the square is filled by numbers from 1 to . At this game, the player plays the game precisely because each cell in a row or column should have a unique number. The mini grid should have no repeated numbers. This research proves that to determine the number of the isomorphic Sudoku solutions from given Sudoku solutions can be calculated using reduced Sudoku. Sudoku symmetry group is a collection of Sudoku solutions that is experienced symmetry group operations. Symmetry group operation is an operation permutation consisting permutation values, stack permutations, permutations band, column permutations on the stack, or row permutations of the band. The isomorphic Sudoku solutions from reduced Sudoku can be obtained from symmetry group operation imposed on Sudoku reduced. The total possible Sudoku solutions calculated from the number of given reduced Sudoku.
Keyword: sudoku symmetry group, reduced sudoku, isomorphic

Judul: Penyelesaian Puzzle Sudoku Menggunakan Pemrograman Linear Integer
Abstrak: Sudoku can be viewed as a puzzle in mathematics. Players must fill in a n2 × n2 matrix which is containing some given enteries, so that each row, column, and n × n mini grid contains each integer 1 through n2. The objectives of this research are to study the traditional Sudoku puzzle, Sudoku X puzzle (diagonal Sudoku) and use branch and bound method, to find the relation between the number of possible solution with the size of sudoku, and the number quantity givens. The solutions are determined using branch and bound method that was implemented on m-file script. We can find the relation between the number of possible solution with the size of sudoku, and the number quantity givens. On the other hand, we can not find such relation for general size of sudoku and general configuration
Keyword: Bogor Agricultural University (IPB), branch and bound, linear integer, Sudoku

Judul: Peningkatan kadar vanillin homogenat vanila dengan penambahan ekstrak enzim dari kapang Aspergillus niger
Abstrak: Ekstrak vanila alami berharga sampai dengan USD 4000 per kilogram. Industri sudah menggunakan vanillinsintetik sebagai pengganti flavor vanila alami. Hargavanillin sintetis jauh lebih murah(USD 12 per kilogram), akan tetapi penggunaannya sangat berpengaruh terhadap flavor produk secara keseluruhan. Ekstrak vanila alami terdiri lebih dari 100 komponen yang semuanya memiliki kontribusi terhadap flavor akhir, sementara produk penggantinya hanya mengandung vanillin (Dignum, 2002). Rendahnya kualitas flavor vanila Indonesia diduga terjadi karena tidak semua senyawa glikosida terhidrolisis menjadi aglikon, disebabkan rendahnya aktivitas enzimatik ẞ-glukosidase yang terdapat dalam buah vanila. Penelitian ini bertujuan untuk meningkatkan kadar vanillin homogenat vanila melalui peningkatan aktivitas enzim ẞ-glukosidase dengan cara menambahkan ekstrak enzim ẞ-glukosidase dari kapang Aspergillus niger. Penelitian pendahuluan dilakukan untuk mengetahui jenis kapang dan waktu inkubasi yang optimum untuk memproduksi enzim ẞ-glukosidase. Kapang yang digunakan adalah Aspergillus niger dan Aspergillus oryzae. Hasil yang diperoleh kemudian dikarakterisasi untuk mengetahui kondisi optimum enzim untuk diaplikasikan kedalam homogenat vanili. ...
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