Judul: Diversity and Distribution of Amblypygi (Arachnida) in Siparat and Sipahang Caves, Bogor
Abstrak: Amblypygi merupakan ordo dari kelas Arachnida yang banyak ditemukan di dalam gua di kawasan karst. Sepertiga spesies Amblypygi yang telah diketahui merupakan hypogean dari gua. Penelitian ini bertujuan untuk mempelajari keragaman dan sebaran Amblypygi di dalam Gua Siparat dan Sipahang, Bogor. Amblypygi dikoleksi dengan metode hand collecting di sepanjang lorong gua. Pemetaan gua dilakukan dengan teknik forward method dari bottom to top. Amblypygi yang ditemukan di kedua gua tersebut ialah Stygophrynus dammermani dan Stygophrynus sunda. Kedua spesies tersebut terdistribusi secara acak di dalam gua. Amblypygi banyak ditemukan di dinding gua., Whip spiders (Arachnida, Amblypygi) are commonly found in caves in karst region. One-thirds of whip spider species are known to live on hypogean habitat. The research is aimed to study the diversity and distribution of Amblypygi in Sipahang and Siparat Cave, Bogor. The whip spider were collected by hand collecting method along the cave passage. Cave Mapping was done by forward technique method from bottom to top. The whip spiders found in both caves were Stygophrynus dammermani and Stygophrynus sunda. The whip spiders species distributed randomly inside the caves on the caves walls. Keywords: Amblypygi, new record, diversity, Stygophrynus dammermani, Stygophrynus sunda
Keyword: Amblypygi, catatan baru, diversitas, Stygophrynus dammermani, Stygophrynus sunda

Judul: Keanekaragaman Laba-laba (Ordo Araneae) di Daerah Mangrove
Abstrak: Spider (Order Araneae, Phylum Arthropod) has high adaptation to different types of environments. Therefore, spider is a cosmopolitan animal due to their ability to live anywhere. The spider can be found in terrestrial, arboreal, and some aquatic habitat. One of the aquatic habitat is mangrove. In every ecosystem, spider is an important component in the food chain i.e. as a predator. Thus, this research was aimed to study the diversity of spider in the mangrove vegetation in Wildlife Reserve and Protected Forest of Muara Angke in Jakarta and the mangrove vegetation in Kolaka, Southeast Sulawesi. Spider was collected using sweeping and beating techniques on the transect lines in each species of mangroves. There were 21 families and 32 genus of spider in two different locations which were Wildlife Reserve and Protected Forest Muara Angke, Jakarta. The dominant families of Araneae in Wildlife Reserve and Protected Forest were Mimetidae, Tetragnathidae, Salticidae, and Oecobidae. Mimetidae has highest abundance from all of the spider families found. Among the four families above, two most dominant genera were existed, i.e. Mimetus and Tetragnatha. Two families of spider which were found in Kolaka were in five genera and the dominant family was Tetragnathidae. The dominant genera spiders in Sonneratia Rhizopora, and Avicennia were Mimetus, Tetragnatha, and Ebo, respectively.
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Judul: Separation of Neodymium from U3Si2/Al Fuel Plate for Burn-Up Determination
Abstrak: Neodymium is a common fission product produced in nuclear fission reactions. Neodymium in this study was chosen as a burn-up indicator for U3Si2/Al fuel element plates because the neodymium isotope is a stable fission product with a fairly high yield. Some procedures were carried out to separate neodymium, starting with the separation of cesium isotopes (137Cs, 134Cs) through the precipitation method, then separation of uranium isotopes (235U, 238U) and plutonium isotopes (239Pu, 238Pu) with Dowex 1x8 ion exchange resin, and separation of neodymium (Nd), samarium (Sm), as well as cerium (Ce) with Dowex 1x4 ion exchange resin. The Cs recovery reached 99.95%. The U and Pu isotopes resulting from the separation are subjected to an electrodeposition process and the weight of each isotope can be measured with an alpha spectrometer. The separation results of Nd from Sm and Ce have been proven using an XRF spectrometer. The neodymium isotopes separation was corrected using the standard addition method, and an average total Nd content of 2.4 ppm was obtained in the PEB U3Si2/Al bottom solution. It is hoped that this separation method can be applied in determining burn-up of nuclear fuel.
Keyword: neodymium, burn-up indicator, U3Si2/Al fuel plate