Judul: Perbandingan Ukuran-Ukuran Bagian Tubuh Lebah Pekerja Apis dorsata (Lebah Hutan) pada Empat Lokasi
Abstrak: Apis dorsata bee is Indonesia local bee, and generaly can be found in the forest. Until now A. dorsata bee has not been cultured like A. mellifera dan A. cerana. A. dorsata, a honey producing bee, has larger body size than A. florea and A. cerana. Limited information about the producing honey bee, especially A. dorsata, in this study it is to be compare the body sizes of A. dorsata worker bees. The data used in this study the results of measuring were the size of body parts of A. dorsata worker bees, those from; North Luwu, Tesso Nilo National Park, Sumbawa, and The Lake Sentarum National Park. The number of worker bees A. dorsata used in this study were 400 samples (100 samples from each location). The eight body variables based on Ruttner et al. (1988), which the length of proboscis (X1), the length of the front wing (X2), the width of the front wing (X3), the width of abdomen (X4), the length of hind leg femur (X5), the length of hind leg tibia (X6), the length of hind leg metatarsus (X7), and the width of hind leg metatarsus (X8), and those eight variables by descriptive statistical analysis and independent 2-sample t-test. Some differences in size of the body parts of worker bees A. dorsata among those from North Luwu, Tesso Nilo, Sumbawa and The Lake Sentarum are seen in the length of proboscis (X1), the length of the front wing (X2), the width of the front wing (X3) and the length of hind leg femur (X5).
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Judul: Geometric morphometrics of wing venation honey bee Apis dorsata
Abstrak: Lebah Apis dorsata tersebar luas di kepulauan Indonesia, namun, hubungan kekerabatan berdasarkan variasi landmark yang menunjukkan pola persebarannya belum pernah dianalisis. Lebah A. dorsata memiliki landmark homolog pada venasi sayap yang merupakan karakter dapat diturunkan. Penelitian ini bertujuan mengeksplorasi landmark penciri venasi sayap A. d. dorsata asal Pulau Sumatera, Belitung, Jawa, Sumbawa, Maluku dan A. d. binghami asal Pulau Sulawesi serta menganalisis hubungan kekerabatannya. Metode yang digunakan adalah digitasi landmark dan menganalisis kekerabatan melalui landmark venasi sayap dengan perangkat lunak Thin Plate Spin (TPS) dan R. Grid deformasi berdasarkan konfigurasi landmark menunjukkan variasi venasi sayap A. dorsata. Variasi landmark pada grid deformasi dipengaruhi oleh bending energies. Bending energies menunjukkan penciri landmark 14 dengan nilai variansi yang tinggi serta landmark 16 dan 17 adalah dua nilai dengan kontribusi relatif tertinggi. Landmark tersebut dikenal dengan cubital index dalam morfometika tradisional yang juga digunakan sebagai karakter menentukan subspesies lebah madu. Plot ordinasi menunjukkan sebaran dan kedekatan individu A. dorsata berdasarkan morphometrika geometrik venasi sayap dari berbagai pulau di Indonesia. Kladogram hasil analisis kekerabatan berdasarkan metode neighbor-joining menyatakan bahwa A. dorsata asal Sumbawa dan Sulawesi terdapat pada clade yang terpisah dari A. dorsata di pulau lainnya., Apis dorsata distributes across a large area in the Indonesian archipelago, however, the relationship based on landmark variations to reveal the pattern of their distribution has never been analyzed. Apis dorsata has homologous landmarks on wing venation which presumably are inherited. This research aimed to explore the venation landmark of A. dorsata wings from Sumatera, Belitung, Java, Sumbawa, Mollucas dan A. d. binghami from Sulawesi and analysed their relationships. The method employed were landmark digitization and the relationship of the wing venation landmarks using Thin Plate Spin (TPS) and R software. Deformation grids based on landmark configurations showed variations in the venation of the A. dorsata wing which are influenced by bending energies. The bending energies revealed that the landmark 14 has high variance value and the landmark 16 and 17 were the two highest value of relative contribution. These landmarks were known as the cubital index in the traditional morphometrics, are used for subspecies determining in honey bees. Ordination plots presented that the distribution and proximity of A. dorsata individuals based on wing morphometric geometric. The cladogram based on neighbor-joining showed that A. dorsata from Sumbawa and Sulawesi are in a clade separated with A. dorsata from other islands.
Keyword: Apis dorsata, A. dorsata binghami, cubital index, digitasi landmark sayap, Sulawesi

Judul: Studi Konduktivitas Elektrolit Polimer Kitosan/PEG+KCl
Abstrak: Solid polymer electrolyte can be classified as a solid material that has the ability to conduct electric current by the movement of ions and has the same functions as an electrolyte solution. Polymer electrolyte film based on chitosan/PEG+KCl have been produced. The process of making is done by mixing a solution of acetid acid with chitosan, PEG and Potassium Chloride (KCl), polymer electrolyte were obtained by the casting technique. Polymer electrolyte with good ionic conductivity properties were characterized by FTIR analysis for the identification of the functional group. The results of FTIR analysis indicates that complexes of polymer electrolyte have formed. The best ionic conductivity values of 5.786 x 10-6 Scm-1 were obtained for the sample containing 45%wt of KCl. Activation energy obtained by using Arrhenius plot, activation energy from polymer electrolyte film with good conductivity is 0.270 eV.
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