Judul: Pengaruh media terhadap pertumbuhan dan perkembangan kecambah kantong semar, Nepenthes mirabilis secara in vitro
Abstrak: Penelitian ini bertujuan untuk mempelajari pengaruh jenis, konsentrasi serta komposisi media yang sesuai untuk perkecambahan biji kantong semar (Nepenthes mirabilis) secara in vitro. Penelitian dilaksanakan pada bulan Juni sarap November 2006 di Laboratorium Bioteknologi Tanaman Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Penelitian terdiri atas dua set percobaan. Percobaan pertama disusun dengan rancangan acak lengkap faktorial 2 faktor yaitu jenis dan konsentrasi medin Jenis media yang digunakan adalah media Murashige and Skoog (MS) dan media Knudson C (KC). Konsentrasi media yang digunakan terdiri dari 4 taraf yaitu 1, %, % dan 4. Percobaan kedua disusun dengan rancangan acak lengkap faktor tunggal yaitu komposisi media. Komposisi media yang digunakan sebanyak 10 macam yaitu ½ MS, % MS +0.04 µM Thidiazuron (TDZ), % MS +0.56 µM IAA, % MS +28.87 µM GA,, ½ MS +150 ml air kelapa, % KC, KC+ 0.04 μM TDZ, % KC+ 0.56 M IAA, 4 KC+ 28.87 µM GA3 dan 4 KC+150 ml air kelapa. Masing-masing perlakuan baik pada percobaan pertama maupun percobaan kedua diulang tiga kali. Peubah-peubah yang diamati adalah persen biji berkecambah, waktu inisiasi kecambah, jumlah daun, jumlah akar, tinggi tanaman, panjang daun, persen tanaman mengalami multiplikasi, persen berkalus dan jumlah tunas. Hasil percobaan pertama menunjukkan bahwa media KC dengan konsentrasi % memberikan pengaruh terbaik pada persen biji berkecambah (96.67%) dan panjang akar (4.02 mm pada 12 minggu setelah berkecambah). Disisi lain media MS dengan konsentrasi ½ memberikan respon terbaik terhadap peubah waktu inisiasi kecambah (37.61 hari setelah tanam), tinggi tanaman (3.99. mm) dan panjang daun setiap minggu pada 12 minggu setelah tanaman berkecambah. Percobaan kedua memberikan hasil bahwa komposisi media berpengaruh sangat nyata pada hampir semua peubah yang diamati. Persentase berkecambah terbesar pada media % KC (96.67%), % KC+TDZ (96.67%) dan ½ MS+GA3 (93.33%). Waktu inisiasi berkecambah berhasil diinduksi tercepat pada media % KC+TDZ (26.67 HST), % KC+GA3 (32.77 HST) dan % MS+TDZ (33.44 HST). Jumlah akar terbanyak pada media % KC dan 4 KC+IAA setiap minggu. Taman tertinggi pada media dengan penambahan GA, sebesar 7.29 mm pada ½ MS+28.87 µM GA3 dan 6.63 mm pada % KC+28.87 µM GA. Fenomena khusus yang terjadi pada percobaan kedua adalah terbentuknya kalus dan terjadinya multiplikasi pada media dengan penambahan 0.04 μM Thidiauron baik pada media % KC maupun % MS. Media % KC +0.04 µM TDZ menghasilkan jumlah tunas, persentase kultur berkalus dan persentase multiplikasi yang lebih tinggi berturut-turut sebesar 2.7, 43.33% dan 46.67%.
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Judul: In vitro Shoot Proliferation Induction and Pitcher Formation of Nepenthes mirabilis in Three Basal Medium Compositions and Benzyl Adenine (BA) Concentration
Abstrak: Nepenthes mirabilis merupakan tumbuhan langka yang termasuk kedalam kelompok Appendix II pada CITES. Perbanyakan Nepenthes dengan biji sulit dilakukan karena daya kecambah yang rendah, sehingga perlu dilakukan perbanyakan secara in vitro untuk mempersingkat waktu, meningkatkan persentase keberhasilan perbanyakan, dan memperoleh bibit kualitas terbaik. Penelitian ini bertujuan mempelajari daya proliferasi tunas, pembentukan kantong, dan planlet N. mirabilis pada tiga komposisi media dasar dan empat taraf konsentrasi BA secara in vitro. Percobaan ini disusun menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) faktorial 2 faktor dengan bahan tanam berupa buku tunas aksilar N. mirabilis in vitro. Faktor pertama adalah komposisi media: Murashige and Skong (MS), Schenk and Hildebrandt (SH), dan Knudson C (KC) dengan setengah konsentrasi hara makro dan mikro. Faktor kedua adalah konsentrasi BA (Benzyl Adenin): 0, 1, 2, 3 mgL-1. Seluruh media perlakuan ditambahkan 0,2 mgL-1 NAA dan 2,0 mgL-1 CaP. Hasil penelitian menunjukan bahwa interaksi komposisi media dengan konsentrasi BA tidak berpengaruh nyata terhadap daya regenerasi dan proliferasi tunas, pembentukan kantong, serta pembentukan planlet N. mirabilis selama 8 MSK. Perlakuan tunggal komposisi media juga tidak berpengaruh nyata terhadap ketiga variabel tersebut. Perlakuan tunggal konsentrasi BA berpengaruh nyata terhadap rata-rata jumlah planlet pada minggu ke 8 yaitu pada sitokinin BA 1 mgL-1. Komposisi media yang optimum untuk menginduksi pembentukan planlet N. mirabilis adalah media ½ MS + 1 mgL-1 BA dengan total jumlah 22 planlet selama 8 MSK., Nepenthes mirabilis is a rare plants that include in the Appendix II lists species from CITES. Propagation of Nepenthes by seed is difficult to do because of the low percentage of germination, so in vitro propagation is carry out to shortened the propagation time, increase the percentage of successful propagation, and produce Nepenthes planlets with good quality. The aims of this research was to study the shoot proliferation ability of N. mirabilis in three basal medium compositions and four levels of BA concentration in vitro. This experiment was designed using a Factorial Randomized Complete Blok Design with two factors. The first factor is the medium composition: Murashige and Skoong (MS), Schenk and Hildebrandt (SH), and Knudson C (KC) with a half of macro and micronutrients concentration. The second factor is the concentration of BA: 0, 1, 2, 3 mgL-1. All of the treatment media were added by 0,2 mgL-1 NAA and 2,0 mgL-1 CaP. The experimental result showed that the interaction of medium composition and BA concentration doesn’t give a significantly effect in shoot proliferation, pitcher, and plantlets formation until 8 weeks after cultivation. The single treatment of medium composition also doesn’t give the significantly effect on that three variables. The single factor of BA concentration give the significantly effect on average number of plantlets in week 8 using BA 1 mgL-1. The optimum media composition to induce the in vitro planlet formation of Nepenthes mirabilis is ½ MS + 1 mgL-1 BA media that produced 22 planlets in 8 weeks.
Keyword: pitcher plant, Murashige and Skoog, Schenk and Hildebrandt, Knudson C, cytokinin

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