Judul: Eksplorasi Agens Biokontrol Asal Rhizosfer Bambu untuk Pengendalian Mati Meranggas (Botryodiplodia theobromae Pat.) Pala.
Abstrak: Bambu merupakan tumbuhan yang tahan terhadap berbagai cekaman. Hal ini disebabkan oleh sifat disease suppressive soil pada rhizosfer bambu yang terjadi karena kemampuan populasi mikroba saprofit dari golongan bakteri dan cendawan dalam menekan perkembangan populasi patogen. Pengendalian hayati merupakan alternatif pengendalian penyakit tanaman yang dapat dilakukan tanpa memberikan efek negatif terhadap lingkungan dan bersifat berkelanjutan sehingga dapat mempertahankan keseimbangan ekosistem. Agens biokontrol berperan penting dalam menjaga kepadatan populasi patogen sehingga keseimbangan ekosistem dapat terwujud. Saat ini, penyakit mati meranggas yang disebabkan oleh Botryodiplodia theobromae Pat. telah dilaporkan di Kabupaten Aceh Selatan sebagai penyakit penting pada pertanaman pala. Studi ini bertujuan untuk memperoleh agens biokontrol asal rhizosfer bambu yang berpotensi dalam menekan pertumbuhan B. theobromae. Berdasarkan hasil studi, diperoleh tujuh isolat bakteri dan satu isolat Trichoderma sp. yang berpotensi in vitro dalam menghambat pertumbuhan B. theobromae. Kedelapan isolat tersebut tidak bersifat patogenik terhadap tanaman dan aman bagi mamalia. Isolat bakteri yang diperoleh mampu menekan pertumbuhan B. theobromae melalui mekanisme kompetisi, antibiosis dan enzimatis. Trichoderma sp. menghambat pertumbuhan B. theobromae melalui mekanisme kompetisi ruang dan nutrisi dan hiperparasitisme. Ketujuh isolat bakteri dan satu isolat Trichoderma sp. asal rhizosfer bambu berpotensi sebagai agens biokontrol untuk mengendalikan penyakit mati meranggas pada pala.
Keyword: antibiosis, bakteri, kitinase, Trichoderma sp.

Judul: Inventarisasi Penyakit Tanaman Bambu di Kebun Raya Bogor
Abstrak: Bambu di Indonesia ada sekitar 157 spesies dan lebih dari 50% merupakan jenis bambu yang dapat dimanfaatkan. Adanya penggunaan bambu diharapkan dapat mengurangi penggunaan kayu yang akhirnya dapat mengurangi penebangan hutan. Bambu rentan terhadap berbagai penyakit dan gangguan lainnya. Penelitian ini bertujuan menginventarisasi penyakit dan mengidentifikasi patogen pada tanaman bambu. Penelitian ini dilakukan di Kebun Raya Bogor dengan mengamati 19 spesies tanaman bambu. Pengambilan sampel tanaman sakit dilakukan pada bagian yang bergejala seperti akar, batang, daun, dan rebung. Dari sampel tersebut dilakukan isolasi dan identifikasi patogen yang ditemukan yang pelaksanaannya di Laboratorium Mikologi Tumbuhan, IPB University. Studi pustaka dilakukan dari beberapa sumber seperti jurnal dan buku untuk melengkapi informasi tentang penyakit pada tanaman bambu. Hasil dari pengamatan ditemukan cendawan Penicillium sp. (daun), Rhizoctonia solani (batang), dan Amylosporus campbellii (akar) pada jenis bambu Gigantochloa apus. Cladosporium sp. juga ditemukan pada batang bambu jenis Dendrocalamus asper. Penyakit lain yang menginfeksi tanaman bambu berdasarkan studi pustaka diantaranya rot of emerging culm (Fusarium moniliforme), sapu (Epichloe bambusae), dan branch die-back (F. pallidoroseum) pada batang. Penyakit pada bagian daun yaitu karat daun (Dasturella divina), embun hitam (Meliola bambusicola), dan embun jelaga (Capnodium sp.). Bagian akar yaitu rhizome bud rot (Pythium middletonil) dan decay of rhizome, root and basal culm (Ganoderma lucidum). Informasi ini dapat dijadikan sebagai acuan dalam merancang tindakan pengendalian penyakit pada bambu., Bamboo types in Indonesia are about 157 species and more than 50% of them are bamboo that can be utilized. The use of bamboos are expected to reduce the use of wood which could ultimately reduce deforestation. Bamboo is susceptible to various diseases and other disorders. This study aims to record the diseases and identify the pathogens of bamboo plants. This research was conducted at Bogor Botanical Gardens by observing 19 species of bamboo plants. Sampling of diseased plants was done on symptomatic plant such as roots, stems, leaves, and bamboo shoots. From these samples, isolation and identification of pathogens were perform, which was conducted at Laboratory of Plant Mycology, IPB University. Literature studies were carried out by cites several sources such as journals and books to complement information about diseases of bamboo plants. The result of this study found Penicillium sp. (leaf), Rhizoctonia solani (stem), and Amylosporus campbellii (root) on bamboo Gigantochloa apus species. Cladosporium sp. also found on bamboo Dendrocalamus asper stems. Other diseases that infect bamboo plants based on literature studies include emerging calm rot (Fusarium moniliforme), witches broom (Epichloe bambusae), and Branch die-back (F. pallidoroseum) on the stem. Disease on the leaves is leaf rust (Dasturella divina), Black mildew (Meliola bambusicola), and Sooty mould (Capnodium sp.). Diseases of the root part are rhizome bud rot (Pythium middletonil) and decay of rhizome, root and basal culm (Ganoderma lucidum). This information can be used as a reference for designing disease control measures of bamboo
Keyword: A. campbellii, bambu, Cladosporium sp., Penicillium sp., R. solani

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