Judul: Kinetika Produksi Gas dan Kecernaan in Vitro Pakan dengan Penambahan Mineral Organik Hasil Inokulasi dengan Saccharomyces cerevisiae dan Suplementasi Hijauan Bertanin
Abstrak: This research was aimed to observe the effect of organic micromineral, tanniniferous forage and its combination supplementation to gas production and in vitro digestibility.This research used king grass (Pennisetum hybrid) as control, leaves of neem (Azaditachta indica) as tanniniferous forage and monensin as antibiotic. A completely randomized design was applied to this research by using 7 treatments with 3 replications. Variables observed were physical quality of fermented feed, in vitro digestibility, number of protozoa, production of ammonia (NH3), concentration of methane (CH4), production of VFA, and gas production. The treatments were: P (P. hybrid), PO (P. hybrid + organic mineral 3%), POA (P. hybrid + organic mineral 3% + A. indica 2%), PM (P. hybrid + inorganic mineral 3%), PMA (P. hybrid + inorganic mineral 3% + A. indica 2%), PA (P. hybrid + A. indica 2%), PMO (P. hybrid + monensin 40 ppm). Results showed that inorganic mineral supplementation (PM) decreased digestibility of dry matter, i.e. from 63.95% to 32.14% (P<0.001). Organic mineral supplementation (PO) and inorganic mineral + A. indica (PMA) increased butyric acid production from 17.93 mM to 28.09 and 25.89 (P<0.01), respectively. Organic mineral supplementation + A. indica (POA) decreased total gas production from 45.37 to 41.55 ml (P<0.01). It can be concluded that organic mineral supplementation only affected butyric acid production and decreased total gas production when added with tanniniferous forage.
Keyword: 

Judul: Suplementasi Tanaman Herbal Yang Mengandung Komponen Bioaktif Terhadap Fermentasi Rumen (Kajian In Vitro).
Abstrak: Sektor peternakan terutama ruminansia, memainkan peran penting pada peningkatan emisi gas metana yang berkontribusi terhadap pemanasan global serta bentuk representasi dari sejumlah kehilangan energi ternak. Salah satu pendekatan untuk meminimalkan emisi gas metana pada ternak ruminansia adalah melalui strategi pemberian pakan. Tanaman herbal memiliki senyawa bioaktif yang mampu menurunkan populasi protozoa, meningkatkan populasi bakteri rumen dan dapat menurunkan gas metan. Penelitian ini menggunakan teknik percobaan fermentasi in vitro. Media yang digunakan adalah larutan buffer bikarbonat + cairan rumen yang dimasukkan kedalam tabung fermentor dan diinkubasi pada shaker water bath bersuhu 39-41°C selama 72 jam. Cairan rumen diambil dari sapi peranakan FH berfistula. Penelitian terdiri dari dua tahap. Tahap 1 merupakan screening terhadap tujuh tanaman herbal yang dirancang menggunakan rancangan acak kelompok dengan tujuh perlakuan dan tiga ulangan. Kriteria screening dilihat dari tanaman herbal yang mampu menghasilkan produksi gas tinggi dan populasi protozoa yang rendah. Tahap 2 menguji tiga tanaman herbal berdasarkan hasil yang diperoleh dari pengujian tahap 1 menggunakan rancangan acak kelompok dengan delapan perlakuan dan tiga ulangan. Perlakuan penelitian ini adalah T1: limbah kelapa sawit (100%), T2: limbah kelapa sawit (70%) + pasak bumi (30%), T3: limbah kelapa sawit (70%) + cola (30%), T4: limbah kelapa sawit (70%) + galinggang (30%), T5: limbah kelapa sawit (70%) + pasak bumi (15%) + cola (15%), T6: limbah kelapa sawit (70%) + pasak bumi (15%) + galinggang (15%), T7: limbah kelapa sawit (70%) + cola (15%) + galinggang (15%) dan T8: limbah kelapa sawit (70%) + pasak bumi (10%) + cola (10%) + galinggang ( 10%). Tahap 1 screening menunjukkan dari tujuh tanaman herbal ada tiga tanaman herbal yang dapat meningkatkan produksi gas serta memiliki populasi protozoa yang rendah yaitu Eurycoma longifolia (pasak bumi), Cola acuminata (cola) dan Cassia alata (galinggang). Tahap 2 penelitian menunjukkan bahwa pemberian tanaman herbal nyata meningkatkan KCBK, KCBO, NH3, VFA parsial, potensi produksi gas total serta menurunkan emisi gas metan dibandingkan kontrol (P<0.05). Simpulan dari penelitian ini penggunaan pasak bumi, cola dan galinggang efektif meningkatkan produksi gas total, persentase KCBK dan KCBO sehingga lebih mudah terdegradasi serta mampu menurunkan emisi gas metan pada fermentasi rumen jika dibandingkan dengan perlakuan pakan kontrol.
Keyword: kecernaan, tanaman herbal, in vitro, metan, protozoa

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