Judul: Rancangbangun Alat Pensteril Air Tambak Sistem Kontinyu Menggunakan Radiasi Ultraviolet
Abstrak: Air dari luar tambak memiliki peluang terbesar membawa virus dan bakteri patogen ke dalam tambak udang melalui sistem pengairan. Air yang bebas dari bakteri dan virus akan mengurangi resiko serangan penyakit pada udang. Teknologi sterilisasi menggunakan radiasi ultraviolet telah terbukti mampu membunuh bakteri dan virus. Tujuan penelitian ini adalah merancang alat pensteril air tambak udang menggunakan radiasi ultraviolet dalam skala laboratorium. Alat sterilisasi menggunakan lampu UV berdaya 30 watt dan 36 watt dirancang untuk saluran air terbuka dengan posisi lampu horizontal, lampu sejajar arah aliran air dan jarak antar lampu 6 cm. Vibrio harveyi sebagai salah satu bakteri patogen pada udang digunakkan sebagai bahan uji penelitian ini. Efektivitas kinerja alat diuji pada debit aliran berbeda dengan estimasi lama penyinaran 1, 2, 3 dan 15 menit. Hasil uji kinerja menunjukkan lampu 36 watt mampu membunuh bakteri lebih banyak dari lampu 30 watt, waktu penyinaran terbaik adalah 15 menit dan bakteri yang hidup masih rata-rata berada pada tingkat patogen.
Keyword: Radiasi ultraviolet, rancangbangun alat pensteril air tambak, vibrio

Judul: Pengaruh Jarak dan Waktu Radiasi Sinar UV terhadap Kontaminasi Bakteri Vibrio harveyi pada Air Tambak Udang.
Abstrak: Water as a medium pond environment plays an important role in the activities of farm ponds, such as shrimp farming. Bacteria free water will reduce the risk of shrimp disease. One of the most common diseases found in shrimp is Vibrio harveyi. Ultraviolet radiation technology has been proven to kill bacteria. This study aims to determine the effect of variations in the distance and long irradiation. The effectiveness of UV radiation lamps are tested at a distance of 3, 5, 7, and 9 cm. The variation of time spent among others 20, 40, 60, and 80 seconds. The test results showed that the percentage of mortality effective at a distance of 3 cm and longer lamp irradiation for 80 seconds at 85%.
Keyword: Ultraviolet radiation, Vibrio harveyi

Judul: Lejeuneaceae Subfamily Ptychanthoideae (Hepaticae) in  West Java
Abstrak: Subfamily Ptychanthoideae of the family Lejeuneaceae (Hepaticae) in West Java is still poorly known. Publications on this subfamily are out of dated and written in the 19th or early of 20th century. The last taxonomic treatment of Ptychanthoideae of West Java was in 1933, many species names have changed since then. Studies on Ptychanthoideae of West Java are urgently needed. Studies on the Ptychanthoideae were based on the specimens collected from West Java. A total number of 361 of specimens deposited in the Herbarium Bogoriense (BO), Herbarium Biotrop (BIOT), Gottingen Herbarium (GOET) and Bangi Herbarium (UKMB) were examined, those are old and several recent specimens collected in West Java. Recent collections were made from Telaga Warna, Ciater, Gunung Halimun Salak National Park, Cibodas Botanical Garden, Bodogol Education Center and Conservation (Gunung Gede Pangrango National Park), University of Indonesia Campus Depok, including several collections from Banten Province. Twenty four species of Lejeuneaceae subfamily Ptychanthoideae are known from West Java, belonging to 8 genera namely Acrolejeunea (Spruce) Schiffn. (2 species), Archilejeunea (Spruce) Schiffn. (1 species), Lopholejeunea (Spruce) Schiffn. (10 species), Mastigolejeunea (Spruce) Schiffn. (3 species), Ptychanthus Nees (1 species), Schiffneriolejeunea Verd. (1 species), Spruceanthus Verd. (2 species) and Thysananthus Lindenb. (4 species). Two new records of Ptychanthoideae: Mastigolejeunea indica Steph. and Thysananthus minor Verdoorn are reported for Java. A determination key to the species is presented including their descriptions and illustrations.
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