Judul: Kinerja Membran Komposit Kitosan-Sodium Alginat pada Sistem Microbial Fuel Cell dalam Menghasilkan Biolistrik dari Limbah Pemindangan Ikan.
Abstrak: Microbial Fuel Cell (MFC) merupakan sumber energi alternatif sebagai penghasil energi listrik dan dapat berasal dari limbah cair perikanan. Membran yang umum digunakan pada MFC yaitu membran nafion tetapi harganya mahal dan harus impor. Alternatif lain yaitu membuat membran dari kitosan dan sodium alginat. Penelitian ini bertujuan menentukan kinerja MFC dalam menghasilkan elektrisitas menggunakan membran kitosan-sodium alginat. Penelitian ini dilakukan dengan empat tahapan yaitu melakukan karakterisasi limbah cair perikanan yang meliputi BOD, COD, pH dan TAN, membuat dan mengkarakterisasi membran komposit dengan perlakuan komposisi alginat dengan kitosan 1:1, 2:1, dan 3:1 (v/v), membuat desain MFC serta mengukur kinerja listrik MFC. Membran kitosan-sodium alginat 2:1 (v/v) menghasilkan nilai elektrisitas tertinggi yaitu tegangan sebesar 0,960±0,077 V, kuat arus sebesar 3,909±2,354 mA dan daya listrik sebesar 3,717±2,176 mW.
Keyword: energi listrik, membran kitosan-sodium alginat, microbial fuel cell

Judul: Produksi Biolistrik Limbah Cair Pemindangan dengan Sistem Salt Bridge Microbial Fuel Cell Berbahan Natrium Alginat
Abstrak: Microbial fuel cell (MFC) merupakan suatu teknologi alternatif penghasil energi listrik dari limbah cair. Microbial fuel cell dua bejana terdiri dari bejana anoda dan katoda yang dihubungkan oleh membran penukar proton maupun jembatan garam. Na-alginat merupakan polimer alami yang dapat dijadikan media jembatan garam. Penelitian ini bertujuan menentukan produksi biolistrik dan penurunan beban polusi dari limbah cair pemindangan dengan sistem salt-bridge microbial fuel cell berbahan Na-alginat. Konsentrasi Na-alginat yang digunakan yaitu 10%, 15%, dan 20%. Nilai elektrisitas tertinggi diperoleh pada perlakuan konsentrasi Na-alginat 20% yaitu nilai tegangan listrik sebesar 1,53 V, arus listrik sebesar 3,96 mA, dan daya listrik sebesar 6,03 mW. MFC jembatan garam Na alginat mampu menurunkan parameter biological oxygen demand (BOD) dan total ammonia nitrogen (TAN) sebesar 73% dan 76%. Perbedaan konsentrasi Na-alginat mempengaruhi kinerja MFC. Perlakuan terbaik terdapat pada konsentrasi Na-alginat 20%., Microbial fuel cell is an alternative technology for producing electrical energy from wastewater. Dual chamber MFCs consists of anode and cathode chambers connected with a proton exchange membrane or salt bridge. Sodium alginate is a natural polymer that can be used as salt bridge medium. This study was aimed to determine the bioelectric production and reduce the pollution load from the effluent using salt-bridge microbial fuel cell system made from Na-alginate. The sodium alginate concentrations used were 10%, 15%, and 20%. The highest value of electricity was obtained in the treatment of 20% sodium alginate concentration, the electric voltage was 1,53 V, the electric current was 3,96 mA, and the electric power was 6,03 mW. Sodium alginate salt bridge MFCs were able to reduce BOD and TAN parameters by 73% and 76%, respectively. Differences in Na-alginate concentrations affect MFC performance. The best treatment was at a concentration of 20% Na-alginate.
Keyword: elektrisitas, jembatan garam Na-alginat, limbah cair perikanan, microbial fuel cell

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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