Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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Judul: Kajian Teknik Pemeliharaan dan Pertumbuhan Kura-kura di PT Mega Citrindo Parung - Bogor
Abstrak: Turtle has used by humans for food, medicine, education and pets. PT Mega Citrindo has used turtle for export as pets. This study aimed to assess the handling of turtle that has been carried out by PT Mega Citrindo. In addition, measure the growth rate of pig nose turtle (Carettochelys insculpta) and morphometry of the siebenrocki snake-necked turtle (Chelodina siebenrocki), parker’s snake-necked turtle (Chelodina parkeri) and reimann's snake-necked turtle (Chelodina reimanni). Data collected include data handling, growth and morphometry turtles. The types of handling data consisting of the cage, food, health, eggs and chicks, as well as utilization of the results. Data of growth include weight, length and width of the carapace pig nose turle (Carettochelys insculpta). While data of morphometric measurements taken on the carapace and plastron puck. The method used in this research is the field observations, interviews and literature. Field observations were used to obtain primary data. Interviews were conducted the officers and owners of captive breeding. While the literature study conducted on the technical aspects of breeding, growth and morphometry turtles. Then the data were analyzed by compiling the data in the form of tables and figures, so it can be concluded. Turtles can be kept in a plastic box and a permanent enclosure in accordance with the purpose of handling. This cage is cleaned every day or every other day to clean the cages of the remaining food and dirt. Type of feed given in the form of fruits and meat. Disease found on a turtle that is attacked by worms and fungi. The turtle is used have characteristics that is healthy and not disabled. The turtle packed with using cloth bags, plastic boxes and sectional. This company has been providing live animals are kept. The growth rate of pig nose turtle (Carettochelys insculpta) weight is 4,83 gram/month. The growth rate of length and width carapace are 1,2 mm/month and 1,3 mm/month. This is caused by environmental factors such as food, space and health. Siebenrocki snake-necked turtle (Chelodina siebenrocki), parker’s snake-necked turtle (Chelodina parkeri) and reimann's snake-necked turtle (Chelodina reimanni) can be distinguished by looking at the complexion of the head. Key features of this body can help in handling, breeding and utilization of results. Percentage length of the long neck turtle carapace type reimann's snake-necked turtle smaller than siebenrocki and parker’s snake-necked turtle. The male turtle have longer tail than female turtle.
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Judul: The Effect of Ni Doped Level on MoS2 as Anode of Natrium Ion Batteries (NIB) on Adsorption and Diffusivity of Na Ions
Abstrak: Perkembangan teknologi elektronik dan kendaraan listrik menuntut ketersediaan baterai isi ulang dengan kapasitas dan ukuran yang besar. Hal ini menyebabkan semakin meningkatnya kebutuhan litium. Li ketersediaannya akan habis dan harganya akan melonjak tinggi. Natrium menjadi solusi karena karakteristiknya menyerupai Li, murah dan ketersediaannya melimpah. Namun, jari-jari kation Na lebih besar sehingga diperlukan modifikasi komponen baterai Na. Studi eksperimental sebelumnya menunjukkan bahwa monolayer MoS2 terdoping menghasilkan kinerja elektrokimia yang ditingkatkan dan kapasitas baterainya lebih tinggi dibandingkan dengan monolayer MoS2 murni. Nikel ditambahkan pada penelitian ini dengan cara doping karena ketersediaan Ni sangat melimpah. Melalui perhitungan DFT, penulis menyelidiki perilaku adsorpsi dan difusi ion Na pada MoS2 murni dan MoS2 terdoping Ni (dengan kadar 0%, 25%, 50% dan 100%). Pengaruh doping Ni pada MoS2 memiliki kelebihan dan kekurangan. Luas permukaan struktur sistem MoS2 terdoping Ni lebih kecil, sifat konduktivitas struktur sistem terdoping menjadi lebih baik, transfer muatan dari permukaan terhadap Na lebih besar, kapasitas penyimpanan baterai meningkat, ion Na teradsorpsi lebih baik karena energinya lebih negatif, namun, atom Na tidak terdifusi dengan baik karena energi aktivasi yang besar sehingga menyebabkan atom Na sulit untuk bergerak.
Keyword: adsorption, diffusion, DFT, Nickel, Sodium