Judul: Struktur Komunitas Gastropoda di Zona Intertidal Desa Watukarung, Kabupaten Pacitan, Jawa Timur.
Abstrak: Gastropod is a class with the biggest number of species from the mollusk phylum, since it is able to adapt with any type of habitat. Watukarung Village, which has unique characteristic of its rocky beaches and sand dunes, is one of many habitats of gastropods in the intertidal zone. Thus, a basic information on the structure of the gastropods community in the area is required. Research was conducted in August 2014 in Ngalorombo Beach, Pasir Putih Beach, and Kasap Beach. Systematic sampling was applied using the quadratic plot of 1 x 1 m2, while data analyses comprised of density, Shannon-Wiener index, Eveness index, Simpson index, and correspondence analysis. The result showed that the gastropods were found consist of 8 families, 9 genera, and 13 species. The highest density and the most diverse of the category were ini Kasap Beach. Eveness index and Simpson index of the species in the three beaches were in the low category. There was a tendency of the gastropods to live in the coarse sand and stones with good water quality as their habitat, which was good for the gastropods live, as shown in the result of the correspondence’s analysis.
Keyword: Bogor Agricultural University (IPB), Watukarung Village, intertidal zone, gastropod, Community structure

Judul: Distribusi Spasial dan Struktur Komunitas Gastropoda di Pulau Kelapa, Kepulauan Seribu.
Abstrak: Gastropoda merupakan hewan yang memiliki anggota terbanyak dari filum moluska yang mempunyai kemampuan adaptasi yang tinggi dengan berbagai tipe habitat. Pulau Kelapa memiliki area pantai berpasir, area tersebut merupakan salah satu habitat yang sesuai bagi kelas gastropoda di zona intertidal. Penelitian ini bertujuan mengetahui distribusi spasial dan struktur komunitas gastropoda di wilayah tersebut. Penelitian dilakukan pada empat stasiun, dimana pada setiap stasiun terbagi menjadi 3 substasiun, pengambilan sampel gastropoda dilakukan menggunakan metode transek kuadrat ukuran 1x1 m2. Hasil penelitian menunjukkan bahwa gastropoda yang ditemukan terdiri dari 11 famili, 13 genera dan 20 jenis. Spesies dengan kepadatan tertinggi adalah Cerithidea cingulata dan Cerithidea quadrata. Secara keseluruhan, nilai keanekaragaman cenderung sedang dengan indeks keseragaman tinggi dan indeks dominasi rendah pada keempat stasiun. Hasil analisis korespondensi menunjukkan adanya kecenderungan gastropoda menyukai habitat berpasir dan ditumbuhi makroalga, memiliki C-organik substrat yang tinggi dan kondisi kualitas air yang baik untuk kehidupan gastropoda. Distribusi spasial gastropoda dipengaruhi oleh kombinasi karakteristik perairan, substrat dasar dan juga tutupan substrat.
Keyword: distribusi spasial, gastropoda, Pulau Kelapa, struktur komunitas

Judul: Prenilasi Senyawa β-Diketon sebagai Prekursor 3-Prenilflavon
Abstrak: One group of flavonoids that has not been commonly synthesized is 3- prenylflavone. The main objective of this experiment was to synthesize precursor of 3-prenylflavone. Firstly, β-diketone was synthesized via 4 steps from phenol as starting compound with total yield of 24%. Prenylation of β-diketone with prenyl bromide and K2CO3 base produced 4 fractions which were separated by using preparative thin layer chromatography (PTLC) with n-hexane:EtOAc (8:2) as the eluent. Fraction with Rf = 0.80 was further separated by using preparative PTLC with n-hexane:EtOAc (99:1) as the eluent. Two fractions were obtained with Rf = 0.38 and 0.42. The first fraction has been characterized as diprenylated β-diketone with 49% yield. Application of protecting group on the phenolic OH group in β- diketone are needed to obtain monoprenylated β-diketone which can be further cyclized into 3-prenylflavone
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