Judul: Inventarisasi dan identifikasi caplak pada ular sanca kembang (Python reticulatus) dan ular sanca albino (P. bivittatus albino) di Taman Margasatwa Ragunan, Jakarta
Abstrak: Caplak merupakan salah satu ektoparasit yang menginfestasi ular. Data mengenai caplak yang menginfestasi ular sanca kembang (P. reticulatus) dan ular sanca albino (P. bivittatus albino) di Taman Margasatwa Ragunan belum ada. Penelitian ini bertujuan menginventarisasi dan mengidentifikasi caplak pada ular sanca kembang dan ular sanca albino di Taman Margasatwa Ragunan, Jakarta. Caplak dikoleksi dari bagian kepala, badan ventral, badan dorsal dan ekor. Preparat sediaan utuh caplak dibuat dengan media entellan dan media Hoyers. Prevalensi ular sanca kembang (P. reticulatus) dan sanca albino (P. bivittatus albino) diinfestasi caplak sebesar 100%. Sebanyak 1 097 ekor caplak berhasil dikoleksi pada penelitian ini. Berdasarkan karakter morfologi, seluruh caplak yang dikoleksi adalah Genus Amblyomma (Subgenus Aponomma) Spesies Amblyomma gervaisii L.. Karakteristik caplak A. gervaisii L. adalah hipostom dengan susunan gigi 3:3, skutum berornamen, koksa tungkai pertama memiliki dua spur dengan spur eksternal lebih panjang dibanding internal, basis capituli sub-triangular, sebelas lempeng festoon, dua spur pada koksa tungkai pertama dan satu spur pada koksa tungkai 2, 3, dan 4. Amblyomma gervaisii L. paling banyak ditemukan pada bagian badan ventral ular. Penelitian ini menemukan fase larva, nimfa, imago caplak jantan dan betina sedangkan fase telur dan larva jantan tidak ditemukan.
Keyword: Amblyomma gervaisii L., Ectoparasite, Python reticulatus, Python bivittatus albino

Judul: Studi Infestasi Caplak dan Deteksi Borrelia spp. pada Caplak yang Menginfestasi Kura-Kura Darat
Abstrak: Hard-bodied ticks of the genus Amblyomma that parasitize reptiles are potential vectors of zoonoses. This study aimed to describe tick infestations and detect Borrelia spp. infections in ticks found on tortoises. One hundred six tortoise hosts were examined at selected locations in Indonesia. DNA extraction and Borrelia spp. detection were carried out by conventional PCR. In this study, nineteen hard-bodied ticks were collected from one Chelonoidis carbonarius, one Chelonoidis denticulatus, and six Geochelone sulcata. All collected ticks were identified as Amblyomma sparsum. The prevalence of A. sparsum on tortoises was 7.55%. Borrelia spp. were detected in several of the A. sparsum infested on tortoises. Sequencing revealed two separate reptile-associated (REP) Borrelia strains., Caplak keras dari genus Amblyomma yang menjadi parasit pada reptil berpotensi menjadi vektor zoonosis. Penelitian ini bertujuan mendeskripsi infestasi caplak dan mendeteksi infeksi Borrelia spp. pada caplak yang ditemukan pada kura-kura darat. Seratus enam inang kura-kura darat diperiksa di beberapa tempat di Indonesia. Ekstraksi DNA dan deteksi Borrelia spp. dilakukan menggunakan metode PCR konvensional. Hasil penelitian diperoleh sembilan belas caplak keras yang dikoleksi dari seekor kura-kura darat jenis Chelonoidis carbonarius, seekor Chelonoidis denticulatus, dan enam ekor Geochelone sulcata. Jenis caplak yang ditemukan adalah Amblyomma sparsum, dengan prevalensi sebesar 7.55%. Borrelia spp. dideteksi pada beberapa A. sparsum yang menginfestasi kura-kura darat. Hasil sekuensing menunjukkan adanya dua galur reptile-associated (REP) Borrelia.
Keyword: Amblyomma sparsum, PCR, reptile-associated Borrelia, tick infestations, tortoises

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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