Judul: Pola Distribusi Penyu Lekang (Lepidochelys olivacea) Berdasarkan Struktur Genetik di Teluk Cendrawasih, Pulau Kapoposang, dan Kupang.Pola Distribusi Penyu Lekang (Lepidochelys olivacea) Berdasarkan Struktur Genetik di Teluk Cendrawasih, Pulau Kapoposang, dan Kupang.
Abstrak: The olive ridley sea turtle (Lepidochelys olivacea) is one species of sea turtles that can be found in Indonesia. The distribution pattern of olive ridley turtle (Lepidochelys olivacea) based on the genetic structure is poorly known. Therefore, this study aimed to determine the distribution pattern of olive ridley sea turtle (Lepidochelys olivacea) based on the genetic structure Mitochondrial. DNA Cytochrome Oxidase 1 (CO1) was used as marker. The distribution pattern indicated that the absence of inter-population genetic structure of olive ridley turtle (Lepidochelys olivacea) between three populations of Cendrawasih Bay, Kapoposang Island, and Kupang (FST=-0.023;P-value=0.462). High genetic diversity was observed in three populations (h=1.00+/-0.04). High gene flow seems influenced by the behavior of turtle migration. The olive ridley turtle migration patterns moving within the Indonesian waters.
Keyword: Lepidochelys olivacea, DNA Barcoding, genetic structure, migration

Judul: Karakteristik Habitat Peneluran Penyu Lekang (Lepidochelys olivacea, Hirth 1971) di Taman Wisata Alam Air Hitam, Bengkulu
Abstrak: Olive ridley features the most common sea turtle species in TWA Air Hitam, which listed as endangered species under IUCN redlist. The objectives of this research were to describe characteristics of shore environment and to define significant environmental variables affecting olive ridley in choosing its nesting habitat. Observation and in situ measurement was conducted in July 2013 and February 2014 at 16 sites, applying systematics sampling approach. Measured habitat variables were number of nest, shore elevation, vegetation, fraction of sandy substrate, shore width and length which then analyzed using Principal component Analysis (PCA). This study revealed that the prominent features of shore environment in TWA Air Hitam were sandy shore with low elevation (0,970-4,230) and width of 32,65-86,70 m, very fine sand fractions (54,88%), also stands of coast she-oak (Casuarina equisetifolia) with significant index of 179,68. Results from PCA indicated that, away 16 environmental variables depicting the shores of TWA Air Hitam, medium fraction sands (grain size of 0,25-0,5 mm) and the existence of shore vegetation were significant habitat variables preferred by olive ridley in detecting nesting site.
Keyword: Bogor Agricultural University (IPB), shore environment, TWA Air Hitam, olive ridley, nesting habitat

Judul: The Addition of Niobium (Nb) to Uranium Zirconium (U-Zr) Alloy for Nuclear Fuel
Abstrak: Pengembangan bahan bakar nuklir merupakan aspek penting dalam teknologi reaktor nuklir, dengan fokus pada keamanan dan ekonomi. Saat ini, reaktor riset G.A. Siwabessy menggunakan bahan bakar uranium silisida (U3Si2/Al) yang memiliki beberapa kekurangan, seperti densitas maksimum 4,80 gU/cm, The development of nuclear fuel is a crucial aspect of nuclear reactor technology, focusing on safety and economics. Currently, the G.A. Siwabessy research reactor uses uranium silicide (U3Si2/Al) fuel, which has drawbacks, such as a maximum density of 4.80 gU/cm
Keyword: zicronium, reactor, niobium, nuclear, ?-uranium