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Seaweed has ecological benefits as well as economic value. Waters condition of Awur Bay and Krakal Beach supported this plant’s growth. There’s not yet the latest information about the vegetation. Utilization is still limited on some specieses. Tourist and inhabitant’s activities who take this plant would give impact to this plant’s vegetation. Therefore, it’s necessary to have data collecting, monitoring, and controlling at both of location. This research was aim to inventarisasi of seaweed for morphologic and anatomic characteristics at both of location. The research of method is explorative descriptive. The results showed that the amount of seaweed which was found at Awur Bay based on the morphology characteristics consist of two divisions was Chlorophyta (3 species) and Phaeophyta (5 species). Beside that, the amount of seaweed which was found at Krakal Beach based on the morphology characteristics consist of three divisons was Chlorophyta (4 species), Phaeophyta (2 species) and Rhodophyta (11 species). Three types of cell (anatomy) i.e. epidermis, kortex and medulla. The results of seaweed which found at Krakal Beach are density, frequency, cover percentage, important value index, and ecology index was taller than Awur Bay. Key words : Community Structure, Seaweed, Awur Bay, Krakal Beach    Rumput laut bermanfaat secara ekologis maupun ekonomis. Kondisi perairan Teluk Awur, Jepara dan Pantai Krakal, Yogyakarta mendukung tumbuhan ini dapat tumbuh. Pemanfaatannya masih terbatas pada jenis tertentu. Aktivitas wisatawan dan penduduk sekitar yang mengambil tumbuhan ini akan berpengaruh sehingga perlu dilakukan penelitian tentang struktur komunitas di kedua lokasi tersebut. Penelitian ini bertujuan untuk mengetahui struktur komunitas, inventarisasi jenis baik secara morfologi dan anatomi. Metode yang digunakan yaitu metode deskriptif eksploratif. Hasil penelitian menunjukkan jumlah jenis rumput laut yang ditemukan di Teluk Awur terdiri dari dua divisi yaitu Chlorophyta (3 jenis) dan Phaeophyta (5 jenis). Jumlah jenis yang ditemukan di Pantai Krakal terdiri dari tiga divisi yaitu Chlorophyta (4 jenis), Phaeophyta (2 jenis) dan Rhodophyta (11 jenis). Tiga jenis sel penyusun thallus yaitu sel epidermis, korteks dan medulla. Struktur komunitas yang ditemukan di Pantai Krakal meliputi kepadatan, frekuensi, persentase penutupan, indeks nilai penting, dan indeks ekologi lebih tinggi daripada di Teluk Awur.                                                                                                                            Kata Kunci : Struktur Komunitas, Rumput Laut, Teluk Awur, Pantai Krakal

Abstract. Widyartini DS, Widodo P, Susanto AB. 2017. Thallus variation of Sargassum polycystum from Central Java, Indonesia. Biodiversitas 18: 1004-1011. Sargassum polycystum C. Agardh has characteristic of highly polymorphic thalli among individuals in its population. The shape and size of thalli are variable among the individuals. The study was aimed at knowing the variation of S. polycystum thalli grown in different beaches of Central Java. The data showed that the thalli of the S. polycystum grown in the Karimunjawa had more variation than those grown in the Menganti Beach, as obviously seen on its leaves and vesicles. There was a relationship between salinity and pH of the Menganti Beach of the length of vesicle S. polycystum, but nitrate and phosphate content weren't correlated of variation thalli. Temperature, salinity, and pH of Karimunjawa Beach were correlated with the vesicle's color, nitrate and phosphate correlated of the width as well as upper and lower surfaces of the leaves, phosphate also correlated with the leaf edge and vesicle diameter. Environmental factors in the Menganti Beach had not significantly affected the thalli variation, but salinity and pH had an effect on vesicle length. Temperature, salinity, and pH in the Karimunjawa Beach significantly affected the vesicle color, nitrate and phosphate affect the width of leaves as well as their upper and lower surface. Phosphate also affected the edge of the leaf and the vesicle diameter

D-amino acid oxidase (DAAO) is a flavin adenine dinucleotide-containing enzyme that catalyzes the oxidative deamination of amino acid D-isomers with high stereospecificity, which results in α-keto acids, ammonia and hydrogen peroxide. Having high stereospecificity, DAAO is used in a variety of applications such as drug, biocatalyst, biosensor and preparation of transgenic plants. DAAO is widespread in nature, found in microorganisms to mammals. Microbial DAAO is considered more important than mammalian DAAO for biotechnology application. DAAO production in submerged fermentation is influenced by several factors, such as carbon source, nitrogen source, inducer, dissolve oxygen, temperature and pH. The influence of those factors on DAAO production by microbial origin, DAAO production by microbial recombinant, and its application in biotechnology are discussed in this review. ABSTRAK Enzim D-asam amino oksidase (DAAO) merupakan enzim yang mengandung Flavin Adenine Dinucleotide yang bekerja mengkatalisis reaksi oksidasi deaminasi D-asam amino dengan stereospesifisitas yang tinggi menghasilkan α-asam keto, amonia dan hidrogen peroksida. Karena mempunyai karakteristik sreteospesifisitas yang tinggi, enzim DAAO banyak digunakan untuk berbagai aplikasi seperti obat, biokatalis, biosensor dan penyiapan tanaman transgenik. Enzim ini dapat dihasilkan oleh organisme mulai dari bakteri hingga mamalia, namun untuk aplikasi dibidang bioteknologi, enzim DAAO yang berasal dari mikroorganisme dipandang lebih penting dari pada yang berasal dari mamalia. Produksi enzim dari DAAO dari mikroorganisme dalam kultur cair dipengaruhi oleh beberapa faktor seperti sumber karbon, nitrogen, senyawa penginduksi, oksigen terlarut, temperatur dan pH medium. Pengaruh dari faktor-faktor tersebut terhadap produksi enzim DAAO, produksi enzim DAAO menggunakan mikroba rekombinan serta aplikasinya dalam bidang bioteknologi dibahas dalam tinjauan. Kata Kunci: Enzim, DAAO, D-asam amino, produksi, aplikasi

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