Judul: Variasi Dimensi Elektroda Pasta Karbon Termodifikasi Polianilin sebagai Biosensor Berbasis Glukosa Oksidase Aspergillus niger IPBCC.08.610.
Abstrak: Pembuatan biosensor berbasis amobilisasi glukosa oksidase (GOD) pada elektroda pasta karbon termodifikasi (EPKT) polianilin telah dilakukan, namun nilai Km yang dihasilkan masih rendah dan hanya dapat digunakan untuk mendeteksi kadar glukosa darah rendah. Penelitian ini bertujuan meningkatkan nilai Km dan mendapatkan dimensi EPKT|GOD yang optimal untuk pengukuran kadar glukosa darah tinggi. Upaya yang dilakukan adalah membuat variasi ukuran diameter EPKT yang digunakan. Ukuran diameter elektroda yang digunakan adalah 3 mm, 7 mm, dan 11 mm. Metode yang dilakukan meliputi isolasi dan pemurnian GOD dari A.niger, pembuatan EPKT|GOD, dan pengukuran parameter kinetika kimia EPKT|GOD. Hasil penelitian menunjukkan bahwa semakin besar ukuran diameter elektroda, semakin besar nilai Km, Imaks, dan sensitivitas yang dihasilkan. EPKT|GOD 3 mm pada penelitian ini memiliki nilai Km 4.74 mM, Imaks 0.733 mA, dan sensitivitas 0.177 mA/mM. EPKT|GOD 7 mm memiliki nilai Km 10.34 mM, Imaks 12.121 mA, dan sensitivitas 1.018 mA/mM. EPKT|GOD 11 mm memiliki nilai Km 17.41 mM, Imaks 24.450 mA, dan sensitivitas 1.25 mA/mM. Berdasarkan nilai Km tersebut, pengukuran glukosa darah yang optimal dapat dilakukan menggunakan EPKT|GOD 11 mm dengan nilai konversi Km 313.66 mg/dL.
Keyword: biosensor, dimensi, elektroda pasta-karbon, glukosa oksidase, Km

Judul: Glukosa oksidase teramobil glutaraldehida pada elektroda pasta karbon termodifikasi nanoserat polianilin sebagai biosensor glukosa
Abstrak: Enzim glukosa oksidase (god) sedang banyak dikembangkan dalam aplikasi sensor glukosa salah satunya untuk mengukur kadar glukosa darah, karena sifatnya yang spesifik terhadap oksidasi glukosa. Penelitian ini bertujuan untuk menentukan kondisi optimum dan parameter kinetika aktivitas enzim glukosa oksidase secara voltametri sebagai biosensor glukosa. Enzim god diamobilisasi dengan glutaraldehida secara cross linking pada elektroda pasta karbon termodifikasi polianilin. Polianilin disintesis dengan metode polimerisasi interfasial, menghasilkan morfologi berupa nanoserat berukuran 100-120 nm, dan memiliki konduktivitas yang baik. Kinerja elektroda pasta karbon termodifikasi (epkt) polianilin lebih baik dibandingkan elektroda pasta karbon (epk). Pengaruh ph dan suhu pada kinerja elektroda god/epkt dianalisis secara voltametri, yang menunjukkan kinerja optimum god pada ph 4.5 bufer asetat konsentrasi 0.1 m dan pada suhu 650c. Parameter kinetika enzim diukur pada kondisi ph optimum, diperoleh nilai km dan imaks masing-masing sebesar 0.70 mm dan 4.24 ma dengan sensitivitas sebesar 1.81 mamm-1.
Keyword: glukosa oksidase, polianilin, glutaraldehida, elektroda karbon pasta, biosensor

Judul: Algorithm construction of HLI hash function
Abstrak: Cryptography is a study of mathematical techniques related to aspects of information security regarding on confidentiality, data integrity, entity authentication, and data origin authentication. Data integrity is a service, which is associated with the conversion of data carried out by unauthorized parties. To maintain data integrity, one can use hash functions. An hash function is a computationally efficient function to map an arbitrary length bitstring to a fixed length bitstring called as hash value. The use of hash function in maintaining the information integrity and authentication is in digital signatures, virus protection, and software distribution. Illustration of the hash function in the integrity and authentication of information that is emailed as follow. The sender sends the information and hash value to the recipient. If the hash value of the information is equal to the hash value that is sent by the sender, then information has not been changed. Otherwise the information has been changed. An hash function has two properties, one way and collision resistance. An hash function is called one way if it is computationally infeasible to find any input such that when given any hash value . Meanwhile an hash function is called collision resistant if it is computationally infeasible to find any two inputs where such that . The purpose of this study is to construct a HLI hash function algorithm, to analyze the speed and security of the hash functions as a results of construction. Furthermore, it is to compare it with SWIFFT. Hash function is constructed based on the result of algebraic operations on modular polynomial ringwith . Modular polynomial ring noted as is a set of all polynomials of degree at most with coefficients in . can be represented as a set of integer vector of modulo in dimension . So, it is simple to implement in a computer. In vector operations, is lattice . Furthermore, alattice that is defined from certain polynomial ring is called ideal lattice. HLI hash function is consists of addition and multiplication algorithm in the ring. Addition algorithm consists of sumation operations of modulo and multiplication consists of multiplication operations of modulo . Generally, algorithm of HLI hash function consists of multiplication operations of modulo and addition operations of modulo . However, if the input is binary number then multiplication algorithm only consists of multiplication operation of modulo , so algorithm of HLI hash function consists of multiplication operations of modulo and addtion operations of modulo . An hash function is secured if it has two properties, i.e., one way and collision resistance. HLI hash function hash is one way, it is following the proof of Micciancio. It is has collision resistant because of polynomial is irreducible over and monic. Moreover, it is proved that for every unit vector , the vector is small vector. If the input of hash function is a binary number then HLI hash function only involves addition operations of modulo . So the time that used almost same with SWIFFT. The excellence of HLI hash function is the key size smaller than SWIFFT. This effect on
Keyword: hash function, modular polynomial ring, lattice