Judul: Organ reproduksi beberapa jenis ganggang cokelat dan merah
Abstrak: Penelitian organ reproduksi telah dilakukan terhadap beberapa jenis ganggang cokelat dan meran. Ganggang cokelat yang diperiksa termasuk famili Sargassaceae, meliputi Sargassum cristaefolium, S. echinocarpum, S. plagyophyllum, S. siliquosum, Turbinaria conoides, T. deccurens dan T. ornata. Organ reproduksi pada famili ini berupa percabangan fertil disebut reseptakel. Di dalam reseptake! terdapat konseptakel tempat organ reproduksi betina (oogonium) dan jantan (antheridium). Hasil pemeriksaan menunjukkan bahwa oogonium dan antheridium pada semua sampel yang diamati dapat dijumpai pada konseptakel yang sama atau berbeda, tapi masih terdapat dalam individu yang sama kecuali pada S. siliquosum oogonium dan antheridium terdapat pada individu yang berbeda. Pada ganggang merah berhasil diamati organ reproduksi betina (sistokarp), jantan (spermatia) dan spora (tetraspora). Sistokarp Gigartina sp. 1, Gracilaria coronopifolia, Rhodymenia linearis dan R. palmata berupa bulatan-bulatan yang menonjol dan tersebar di permukaan talus. Sistokarp pada Laurencia intrica dan Laurencia sp. terdapat di daerah korteks, sedangkan pada Galaxaura obtusata dan G. oblongata sistokarp terletak pada bagian medula. Spermatia Chondrococcus hornemannii, L. intrica dan R. linearis tersebar di daerah korteks. Tetraspora pada Ceramium fastigiatum terletak di percabangan khusus, sedangkan tetraspora Gracilaria textorii, Gigartina sp. 2, Gracilaria sp. 1, Hypnea valentiae dan Laurencia intrica terletak di daerah korteks. Seluruh tetraspora yang diamati bertipe tetrahedral kecuali pada Gigartina sp. 2 bertipe zonat. Research on reproductive organ has been carried out on species of both brown and red algae.. Observation on the brown algae included Sargassum cristaefolium, S. echinocarpum S. plagyophyllum. S. siliquosum. Turbinaria conoides, T. deccurens and T. ornata, that belong to Sargassaceae. The reproductive organ of this family is called receptacel, i.e. fertile branches. The receptacel hold conceptacel that consists of either oogonium (female reproduction organ) or antheridium (male reproduction organ), or both. Oogonium and antheridium may be located in the same conceptacel or separated in the different one of the same individual (monoecious), except those of S. siliquosum are separated in the different individual (dioecious). Both female and male organ (called cystocarp and spermatia respectively), together with tetraspores have been observed in red algae. The cystocarps of Gigartina sp. 1, Gracilaria coronopifolia, Rhodymenia linearis and R. palmata are spherical, widespread, protruding out from thallus surface. Cystocarp of both Laurencia intrica and Laurencia sp. are located in cortex, while those of Galaxaura obtusata and G. oblongata, are located on medulla. Spermatia Chondrococcus hornemannii, Laurencia intrica and Rhodymenia linearis spread in the cortex. The tetraspores of Ceramium fastigiatum are located in a particular branch, while that of Gracilaria textorii, Gigartina sp. 2, Gracilaria sp. 1, Hypnea valentiae and Laurencia intrica are located in cortex. All of the tetraspores observed are tetrahedral, except those of Gigartina sp. 2 are zonate.
Keyword: Plant reproduction

Judul: Biodiversity and Potency of Red Algae (Rhodophyta) in Coastal Area of West Java.
Abstrak: Red algal biodiversity was studied based on morphology, anatomy, reproductive structures, and ecology. The study was conducted by surveying and collecting the red algae in five coastal area of West Java: Ujung Genteng, Pangandaran, Pelabuhan Ratu. Anyer, and Carita. Morphology, anatomy, and reproductive structures of thc spccimen were observed. Agar and carTagecnan were analyzed on seven species. A total of 49 species of24 genera and 12 fm':1ilies of red algae was found in coastal area of West Ja"a. Genera with the highest number of species are Graci/aria and Laurencia. Ujl~ng Genteng was the coastal arca with the highest species richness, while Pangandaran was the lowest. Reproductive structures were various. The cystocarps are spherical, dome or cup form and produced on the surface of the thallus, in the medula, or on the branchlet. While the tetrasporangia are formed in conceptacles, on stichidia, or in the cortex with cleavage patterns. zonate, cruciate, and tetrahedral. Red algae in West Java occupied a variety of habitats and substrates. Most of the species attached to the rocky substrates in the surf zone. The highest yields of carrageenan was obtained on Graci/aria sa/icornia and Gracilaria corol1opi!olia, while the highest yields of agar was extracted from Graci/aria spinoslLIll.
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Judul: Query Expansion based on Bilingual Dictionary Using Conditional Probability
Abstrak: Query expansion is a technique that can be used to bridge vocabulary gaps between queries and documents in the collection. With query expansion, user will be helped to formulate queries well so that user will optimize the search result. In this study, the expansion term was resulted from the translation of bilingual dictionary. Subsequently, several terms of expansion were elected based on the closeness of its relationship with the original query. This research showed that conditional probability can be used to select expansion term in bilingual translation method query expansion. The result of 1000 documents was more than 97% relevan document can be retrieved by this system. The more expansion term used, the larger number relevan document was retrieved.
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