Judul: Keanekaragaman Ketam di Sungai yang Berhulu dari Gunung Salak, Bogor, Jawa Barat
Abstrak: Freshwater crab is decapods crustacean of infraorder Brachyura. Freshwater crabs are one of the most ecologically important macro-invertebrate groups in tropical inland waters. The objective of this research was to assess the diversity of freshwater crabs in rivers of mount Salak, Bogor, West Java. Freshwater crabs were taken from eleven sites. Identification based on morphological characteristic and verified by DNA barcode. Three species of freshwater crabs were found Salak Mountain, that are Geosesarma sp., Parathelphusa bogoriensis and Parathelphusa convexa. Those three species were commonly found in Java. Geosesarma sp. can be found around rocks on river banks. Parathelphusa bogoriensis can be found at the brook or under rocks. Parathelphusa convexa can be found on river banks.
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Judul: The diversity of freshwater crab (Crustacea Decapoda: Brachyura) in the Regencies of Batanghari and Sorolangun, Jambi Province
Abstrak: Freshwater crabs are members of the order Decapoda, sub order Brachyura. They can be found in all freshwater bodies. They can also adapt to semi-terrestrial and terrestrial environments. The diversity of freshwater crabs has declined due to habitat changes. Jambi province is an area with high deforestation rate compared to other Asian regions. The deforestation causes habitat fragmentation which alters the biota composition, both terrestrial and aquatic biota. The aims of this study were to study the diversity of freshwater crab in the Regencies of Batanghari and Sorolangun of Jambi in several habitats type. The study was conducted in rubber plantations, oil palm plantations, community forests and secondary forests located at the Regencies of Batanghari and Sorolangun. The specimens were collected by using hand net and fish trap which were preserved in 70% alcohol. The environmental factors observed were altitude (m), brightness (m), velocity (m/second), temperature (°C), depth (m), width (m), pH and substrate type. In Batanghari and Sorolangun Regency, was found 5 species of freshwater crabs that consisted of Parathelphusa tridentata, P. batamensis, P. maindroni, P. maculata and Geosesarma sp. through morphological identification. Based on mitochondrial COI gene analysis, P. batemensis and P. maindroni have nucleotide difference 1.45% (8 nt). In Batanghari Regency, the environmental factors affecting the distribution of P. batamensis were pH, temperature and width of the river, while the distribution of P. maculata, P. tridentata, and Geosesarma sp was affected only by depth; and P. maindroni was altitude. In Sorolangun Regency, the environmental factors affecting the distribution of Geosesarma sp and P. maculata were velocity, the distribution of P. batamensis and P. tridentata was affected by depth and brightness, while the distribution of P. maindroni was influenced by altitude. The highest freshwater crab diversity was found in community forest of both regencies. The lowest freshwater crab diversity was found in oil palm plantation habitat in Sorolangun Regency. The community structure of freshwater crab in Batanghari and Sorolangun Regencies was different in each habitat. Parathelphusa batamensis was found in all habitat types in both regencies. The results of the Multiple Comparisons test showed that In Batanghari Regency there were differences in number of individual crab among community forest and oil palm plantation (P<0.01), as well as at community forest and rubber plantation. In Sorolangun Regency, the number individual of crabs among rubber plantation and secondary forest (SF) were significantly different (P<0.001).
Keyword: Brachyura, COI, Decapoda, Geosesarma, Parathelphusa, Jambi.

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