Judul: Diversity of Molluscs (Bivalve and Gastropod) in Carita Beach, Pandeglang, Banten.
Abstrak: Carita beach is one of a beach ecosystem that has variety of substrates. Substrates were dominated by sand and corral reef flat. There were vegetations such as seagrass and seaweed. The aim of the research was to know species richness and diversity of Bilvave and Gastropod in Carita beach, Pandeglang, Banten. The research was conducted on May 2008. Molluscs sample were collected from 4 stations randomly by using quadrat method. There were 34 species molluscs that had been observed, 3 species belong to Bivalves and 31 species belong to Gastropods. The highest Important Value Index (IVI) of all station was found in Donax cuneatus with 55.21%. The lowest IVI was found in thirteen species of Bivalve and Gastropod with 0.83%. The diversity index (H’) ranged from 0.130 to 2.216, the evenness index (E) was 0.072 to 0.717, and the dominant index (C) was 0.198 to 0.960. The highest diversity index (2.216) was found at station 4 and the lowest (0.130) was at station 1. The similarity index ranged from 0 to 0.744. Key word : diversity, quadrat method, Carita beach
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Judul: Keanekaragaman dan Distribusi Gastropoda dan Bivalvia (Moluska) di Muara Karang Tirta, Pangandaran
Abstrak: Karang Tirta estuary is an estuarine zone located in Pangandaran, West Java. Substrate of the area was dominated by coarse sand and its salinity ranges from 10-25 ‰. The aim of the reaserch was to know the diversity and distribution of gastropod and bivalve in the estuary of Karang Tirta, Pangandaran and environmental factors affecting them. Samples of molluscs were collected from 3 stations choosen randomly by using quadrat method. Seventeen species were found in the study sties, 12 species belong to gastropod and 5 species of bivalve. The highest Importance Value Index (IVI) among the species was observed on Tellina radiata with 47.449 %. The lowest IVI was observed on four species belong to gastropod and bivalve with 1.949 %. The diversity index (H') ranged from 0.536 to 2.429, the evenness index (E) was from 0.189 to 0.857, and the dominant index (C) was from 0.001 to 0.037. The highest diversity index (H’ = 2.429) was found at station 2 and the lowest (H’ = 0.536) was at station 1. The similarity ranged from 0.235 to 0.522. The distribution patterns of molluscs occured mostly in clumps (Id > 1).
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Judul: Sintesis 1-Kloro-2-metoksi-6-propilnaftalena-1,3-dioksolana (1:1) sebagai Prekursor Asam (S)-(+)-(6-Metoksi-2-naftil)propanoat
Abstrak: Senyawa 1-kloro-2-metoksi-6-propilnaftalena-1,3-dioksolana (1:1) sebagai prekursor asam (S)-(+)-(6-metoksi-2-naftil)propanoat disintesis dari bahan awal 2-metoksinaftalena. Tahapan sintesis diawali dengan klorinasi menggunakan 2 jenis pereaksi klorinasi, yakni isosianurat terklorinasi dan NaOCl. Klorinasi dengan isosianurat terklorinasi berhasil menyintesis 1-kloro-2-metoksinaftalena sebagai produk monoklorinasi melalui pencirian dengan kromatograf gas-spektrometer massa (GC-MS). Nisbah konversi produk paling efisien diperoleh pada laju penambahan 2.5 mmol/jam. Sebaliknya, klorinasi dengan NaOCl menghasilkan produk triklorinasi. 1-Kloro-2-metoksinaftalena selanjutnya diasilasi dengan propanoil klorida, tetapi analisis dengan GC menunjukkan bahwa produk asilasi tidak terbentuk. Sistem bebas-air diperlukan untuk keberhasilan proses asilasi tersebut.
Keyword: isosianurat terklorinasi, NaOCl, nisbah konversi