Judul: Pola Distribusi Geografis Pada Udang Mantis Di Laut Jawa Berdasarkan Genom Mitokondria
Abstrak: Mantis shrimp or ronggeng shrimp (Harpiosquilla harpax) is a large sized shrimp. The mostly habitat of mantis shrimp is beach. Shrimps are exploited for trade as an exotic food. Shrimp liked as a source of food because large size and presentation of meat can be as high as 50% by weight. Characteristics stomatopod as predators have two methods to catch prey are smashers and spearers. H. Harpax classified into spearers. This research was conducted to analyze the genetic diversity of mantis shrimp H. harpax in Java Sea and study the distribution based on mitochondrial genome. The sample used is the mantis shrimp H. harpax many as eight tails collection of Dr. Yusli Wardiatno from the Department of Aquatic Resources and Management IPB preserved in ethanol. Amplification was tested in vitro with the technique of Polymerase Chain Reaction (PCR). Product amplification is 1100 bp were arranged and phylogeni analyzed. All of the eight sample are successfully amplified. The distribution pattern of mantis shrimp larvae is mainly larvae carried of alongshore current shoreline. According by filogeografi H. harpax in Cirebon water separately with H. harpax in Vietnam. This is evidenced by the value of the farthest genetic distance is between H. harpax Vietnam and H. harpax 3 is 10.5%, while the closest genetic distance was between H. harpax 1 and 6 (group 1) is 1.8%. Genetic Diversity of H.harpax in Cirebon Aquatic based on d-loop segment has a greater value is 5.1% (± 0.005).
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Judul: Pengelolaan sumberdaya udang mantis (harpiosquilla raphidea Fabricius, 1798) berdasarkan informasi biologi di Kuala Tungkal, Kabupaten Tanjung Jabung Barat, Jambi
Abstrak: This study aims to assess the distribution of population structure, growth, potential food sources, and exploitation rate of mantis shrimp (Harpiosquilla raphidea Fabricius, 1798) as the initial and the basis information for sustainable management of mantis shrimp. This research was conducted in Kuala Tungkal, Tanjung Jabung Barat, Jambi and Chemistry Department, Faculty of Science, University of the Ryukyus, Okinawa, Japan from July 2009 to December 2010 and partially carried out periodically. The results showed the difference in group size distribution is quite clear between the mantis shrimp are caught in the intertidal and subtidal areas. Mantis shrimps in the intertidal area were in the range of 25-233 mm length is dominated by the size of 79-96 mm, while the mantis shrimp in the subtidal area in the range of 160-366 mm length which is dominated by the mantis shrimp the size of 193-258 mm. Growth coefficient (K) H. raphidea is 0.14 for males and 0.11 for females; and L∞ is 381.68 mm (same for males and females). The value of K H. raphidea is same relatively with some other mantis shrimp species, such as Squilla mantis, Oratosquilla oratoria, and O. stephensoni, but H. raphidea have a longer life span, which is 6.7 to 8.5 years. The value of exploitation rate (E) H. raphidea is 0.42; showed that the exploitation rate of mantis shrimp in Kuala Tungkal, Jambi, is not optimum yet. Stable isotope analysis results indicated that the potential food source for shrimp mantis H. raphidea, especially in the intertidal area, is the group of deposit feeders, filter feeders, and plankton. Alternative resource management for mantis shrimp in Kuala Tungkal is habitat protection and domestication of mantis shrimp.
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Judul: Katalis Zink Ferit Tersubstitusi Cu untuk Oksidasi Benzil Alkohol
Abstrak: Katalis berperan dalam menurunkan energi aktivasi. Katalis ZnFe2O4 dan ZnFe2O4 tersubstitusi Cu disintesis menggunakan metode kopresipitasi untuk digunakan dalam oksidasi benzil alkohol. Katalis dicirikan dengan spektrofotometer inframerah (FTIR) dan difraktometer sinar-X. Spektrum FTIR menunjukkan puncak serapan dari ikatan Zn-O dan Fe-O masing-masing pada rentang 559‒575 cm-1 dan 419‒447 cm-1. Difraktogram menunjukkan terbentuknya fase tunggal Zn0.6Cu0.4Fe2O4 pada katalis ZnFe2O4 tersubstitusi Cu 20%. Benzil alkohol dioksidasi dengan sistem refluks. Konversi benzil alkohol meningkat dengan meningkatnya suhu. Kadar benzaldehida yang dihasilkan dengan katalis ZnFe2O4 tersubstitusi Cu 20% lebih tinggi dibandingkan dengan katalis ZnFe2O4 yang tidak tersubstitusi dan yang tersubstitusi Cu 60 dan 80%. Hal tersebut menunjukkan bahwa katalis ZnFe2O4 tersubstitusi Cu 20% memiliki kinerja yang lebih baik dalam oksidasi benzil alkohol menjadi benzaldehida dengan kadar benzaldehida 8.763%.
Keyword: Benzil alkohol, katalis, oksidasi, ZnFe2O4