Judul: Reduksi Kebisingan Akibat Lalu Lintas Menggunakan Pagar dan Dinding dari Material Lokal.
Abstrak: The increasing amount of vehicles implies not only on ambient air quality deterioration but also on increase of environmental noise. Based on Kep-48/MENLH/11/1996, noise caused an illness and make uncomfortable on the environment. Therefore, it is necessary to mitigate and control the noise level. The purpose of this research was to identify the characteristic of local material and to analyze its noise reduction. The experiment was carried out using local materials such as bamboo and timber, with a dimension of 80 cm x 96 cm x 2 cm. Noise reduction experiment was carried out using local vegetation such as Pluchea indica L., Hibiscus rosa sinensis L., Acalypha siamensis, Nothopanax scutellarium, Syzigiu oleina, Stachytarpheta mutabilis, Codiaeum variegatum L., and Bambusa vulgaris. The noise source was a blender. Noise levels were measured on fourpoints at noise source and the behind the fence at distance of 2 m, 4 m, and 6 m. Result of the experiment showed that noise reduction by bamboo, the fence model A reduced 12.7 dBA, 16.8 dBA, and 19.6 dBA at those distances. Using the same model, noise reductions by timber were 12.6 dBA, 17.8 dBA, and 20.3 dBA, respectively. Noise reduction varies by vegetation, Hibiscus rosa sinensis L. could reduced 31.3 dBA, Acalypha siamensis reduced 23.7 dBA, Nothopanax scutellarium reduced 27.1 dBA, Pluchea indica reduced L 30.1 dBA, Syzigiu oleina reduced 24 dBA, Codiaeum variegatum L. reduced 29.8 dBA, Stachytarpheta mutabilis reduced 27 dBA, and Bambusa vulgaris reduced 27.1 dBA. Effective noise reducer was found in material which has higher density, Hibiscus rosa sinensis L. is the vegetation which perform effective noise reduction up to 25.7 dBA-36 dBA.
Keyword: barrier, fence, noise, sound, vehicle

Judul: Potensi Vegetasi sebagai Peredam Ingar Bunyi Kendaraan Bermotor
Abstrak: The increases of transportation everyday have made multiple effects especially for human health. Based on the effects appeared by noise, there were three steps could be done to prevent, to reduce, or to control it. First, noise control at the source of noise, second, noise control at the line, and third, noise control for the receiver (human).This research focus on noise control at the source of noise by plants. The purpose of this research was to investigate the traffic noise attenuation by vegetation. The noise was measured with Sound Level Meter and was taken at two areas, control area without vegetation and deal area with vegetation. Measurement was done in busy days and weekday in the morning, midday, and afternoon. The measurement repeated as many as three. The observation showed that the traffic noise in control area ranging from 77.3-79.4 dBA, whereas in deal area traffic noise ranging from 56.3-59.4 dBA. In this case, vegetation could reduce the traffic noise as many as 20-21 dBA although the observation result over quality standard which defined by The Ministry of Environmentno. 48/1996, that was 65 dBA for office and commerce (control area), and 55 dBA for housing and settlement (deal area).
Keyword: vegetation, noise reduction, traffic noise, noise

Judul: Reproduksi Ikan "Shirogisu" Sillago japonica (Temminck dan Schlegel) di Perairan Teluk Omura, Nagasaki, Jepang
Abstrak: Ikan S. japonica pertama kali matang gonad pada ukuran kelas panjang 185 - 198 mm dan frekuensi terbesar pada ikan jantan pada selang kelas rata-rata 220 mm (100 %) dan ikan betina pada selang kelas rata-rata 234 mm (100 %). Melalui histologi gonad ikan betina, pada TKG II terdapat sel oogonia dimana sel telur belum matang (perinucleolus) yaitu inti sel mulai membesar dan membran sel yang tebal. Pada TKG III, sel telur berkembang menjadi oocyte primer dan kemudian menjadi oocyte sekunder dimana sel telur telah matang (ripe eggs), butiran kuning telur telah terbentuk dan membran sel mulai menipis. Pada TKG IV, sel telur berkembang menjadi ootid, dimana terjadinya penyatuan butiran kuning telur yang menuju salah satu kutub anima (Fusion of yolk globule) dan terdapat membran sel yang menipis pada sel telur yang matang (Oolema of ripe eggs). Pada TKG V, sel telur berkembang menjadi ovum yang akan dikeluarkan pada saat pemijahan, mulai berkurangnya ootid dan terdapat folikel yang kosong. Sedangkan pada testes ikan jantan, TKG I ditunjukkan adanya sel spermatogonia yang berada di dalam kantung tubulus seminifer. Pada TKG I1 sel berkembang menjadi sel spermatogonia. Pada TKG III sel spermatogonia berkembang menjadi spermatocytes primer dimana terjadi pembelahan sel secara miosis (pembelahan pertama) dan kemudian berkembang menjadi spermatocytes sekunder dimana terjadi pembelahan sel yang kedua. Pada TKG IV sel spermatocytes berkembang menjadi sel spermatid, dan pada TKG V sel spermatid herkembang menjadi spermatozoa yang akan dikeluarkan pada saat pemijahan.
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