Judul: Deteksi Serologis Infeksi Neospora caninum pada Kerbau di Kabupaten Sumba Timur
Abstrak: Neospora caninum adalah protozoa parasit penyebab neosporosis pada ternak ruminansia seperti sapi dan kerbau. Kerbau merupakan ternak yang memiliki nilai ekonomi maupun budaya sebagai sarana penting dalam pelaksanaan upacara adat di daerah tertentu. Neosporosis pada kerbau telah diketahui dapat menyebabkan kerugian ekonomi di berbagai negara. Data kejadian neosporosis pada kerbau di Indonesia masih sangat terbatas. Penelitian ini bertujuan untuk mendeteksi keberadaan infeksi Neospora caninum (N. caninum) pada kerbau di Kabupaten Sumba Timur melalui deteksi serologis. Sebanyak 36 sampel serum kerbau dari 10 kecamatan diperiksa keberadaan antibodi terhadap N.caninum menggunakan metode uji ELISA tidak langsung. Berdasarkan uji yang dilakukan, infeksi N.caninum terdeteksi di sepuluh kecamatan asal sampel dengan tujuh diantaranya memiliki proporsi seropositif sebesar 100%. Secara keseluruhan proporsi N.caninum pada kerbau di Kabupaten Sumba Timur sebesar 77,78%. Penelitian ini menunjukkan bukti serologis adanya infeksi N.caninum di Kabupaten Sumba Timur. Penyempurnaan data epidemiologi N.caninum perlu dilakukan untuk mencegah penyebaran dan pengendalian penyakit yang tepat., Neospora caninum is a protozoan parasite that causes neosporosis in ruminant cattle such as cows and buffaloes. Aside from its economic value, buffalo also has an important cultural value for traditional ceremonies in certain places. Neosporosis in buffaloes can cause economic loss in many countries. Data on the neosporosis incidence in buffalo in Indonesia is very limited. This study aimed to detect the presence of Neospora caninum (N. caninum) infection from 36 archived buffalo serum samples taken from 10 sub districts of Sumba Timur Regency using the indirect ELISA test method. Based on the serological test, the antibody against N. caninum was detected in all sub districts of the sample origin and 7 subdistricts found to have a seropositive proportion of 100%. The total proportion of N. caninum infection found in buffalo at Sumba Timur Regency is 77,78%. This is the first study that shows serological evidence of N. caninum infection in buffalo in the Sumba Timur Regency. Improvement of N. caninum epidemiology data needs to be done to control and prevent the spread of the disease.
Keyword: buffalo, ELISA, Neospora caninum, Sumba Timur

Judul: Neosporosis Sapi: Studi Pendahuluan di Lore Barat, Kabupaten Poso, Sulawesi Tengah.
Abstrak: Neospora caninum is recognized as a major cause of serious abortion in varieties of wild and domestic animals around the world especially in cattle. This disease causes severe economic losses among dairy and beef cattle due to the loss of foetus as well as a decrease in milk and meat production, which is believed as an opportunistic zoonotic agent. A cross-sectional study was carried out to determine the prevalence of Neospora caninum antibodies in cattle from five villages in West Lore Subdistrict of Poso Regency, Central Sulawesi, Indonesia. Serum samples were collected from 44 local beef cattle tested for detection of immunoglobulin (Ig) G antibodies against N. caninum using an indirect multi-species enzyme-linked immunosorbent assay (ELISA) commercial test. Seroprevalence of Neospora caninum in local beef cattle in West Lore, Poso Regency, Central Sulawesi is 11.36%. Gender and ages have not affected the prevalence of this parasite. This study gives information about the first serological evidence for the presence of natural N. caninum infection in local beef cattle from West Lore. It is recommended to do further investigations and to design suitable controlling strategies., Neospora caninum dikenal sebagai penyebab utama aborsi pada hewan liar dan domestik di seluruh dunia, terutama pada sapi. Penyakit ini menyebabkan kerugian ekonomi yang parah pada sapi perah dan sapi potong karena sapi kehilangan fetusnya, serta terjadi penurunan produksi susu dan daging. Parasit ini termasuk sebagai agen zoonosis oportunistik. Kajian lintas seksional dilakukan untuk mengetahui prevalensi antibodi Neospora caninum pada sapi dari lima desa di Kecamatan Lore Barat Kabupaten Poso, Sulawesi Tengah, Indonesia. Sampel serum dikumpulkan dari 44 sapi potong lokal untuk mendeteksi antibodi imunoglobulin (Ig) G terhadap N. caninum menggunakan indirect multi-species enzyme-linked immunosorbent assay (ELISA). Seroprevalensi Neospora caninum pada sapi potong lokal di Lore Barat, Kabupaten Poso, Sulawesi Tengah adalah sebesar 11,36%. Jenis kelamin dan usia tidak mempengaruhi prevalensi parasit ini. Penelitian ini memberikan informasi tentang bukti serologis pertama adanya infeksi N. caninum alami pada sapi potong lokal di Lore Barat. Disarankan untuk melakukan investigasi lebih lanjut prevalensi parasit tersebut pada anjing sebagai sumber infeksi horizontal agar dapat merancang strategi pengendalian yang tepat.
Keyword: cattle, Central Sulawesi, ELISA, Neospora caninum, seroprevalence

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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