Judul: Study of Abortion In Dairy Cattle in KPSBU Lembang
Abstrak: Abortus merupakan penghentian masa kebuntingan yang mengakibatkan fetus keluar sebelum waktu kelahiran. Abortus pada ternak sering terjadi sehingga dapat mengurangi angka kelahiran ternak potensial, penurunan populasi ternak produktif, serta kerugian dari segi ekonomi. Penyebab abortus pada sapi perah disebabkan oleh berbagai faktor, faktor infeksi salah satunya yaitu Brucellosis. Sebanyak 30 spesimen swab vagina dari KPSBU Lembang hasil surveilans Balai Veteriner Subang digunakan untuk penelitian ini. Isolasi bakteri dengan kultur di Brucella agar dan biphasic. Kemudian dilakukan uji biokimiawi untuk mendeteksi genus Brucella sp. Identifikasi spesies Brucella abortus dengan metode Polymerase Chain Reaction (PCR) menggunakan primer IS711 Brucella. Hasil penelitian menunjukkan bahwa kejadian abortus yang terjadi tidak disebabkan oleh Brucella abortus, hal ini menunjukkan bahwa abortus diduga disebabkan oleh faktor infeksi patogen seperti bakteri Brucella canis, Brucella melitensis, Campylobacter foetus, dan Chlamdydia abortus. Penyebab infeksi protozoa yaitu Neospora caninum dan faktor non infeksi disebabkan oleh pakan yang terkontaminasi., Abortion is the termination of pregnancy that causes the fetus to come out before birth. Abortion in livestock often reduces potential livestock birth rates, decreases productive livestock populations, and causes economic losses. Abortion in dairy cattle is caused by various factors, one of which is infection Brucellosis. A total of 30 vaginal swab specimens from KPSBU Lembang is the surveillance of Balai Veteriner Subang used for this study. Bacterial isolation in Brucella agar and biphasic. Then a biochemical test to detect the genus Brucella sp. The polymerase chain reaction (PCR) method identifies Brucella abortus with primer IS711 Brucella. The results showed that the incidence of abortion was not caused by Brucella abortus, this indicated that the abortion was thought to be caused by pathogenic infections such as bacteria Brucella canis, Brucella melitensis,Campylobacter foetus, and chlamdydia abortus. The cause of protozoan infection is Neospora caninum and non-infectious factors are caused by contaminated feed.
Keyword: Abortion, Brucella abortus, Brucellosis, Dairy cattle, PCR

Judul: Kajian Infeksi Brucella Abortus pada Sapi Perah Menggunakan Metode Serologik dan Polymerase Chain Reaction (PCR)
Abstrak: Brucellosis is an important zoonotic disease for public and animal health that causes significant economic losses. Widely applied brucellosis detection method are Rose bengal test (RBT) and complement fixation test (CFT) as screening and confirmation tests, respectively. This study was aimed to detect of Brucella abortus infection using serological and molecular tests, i.e., milk ring test (MRT), RBT, CFT, enzyme linked immunosorbant assay (ELISA), and polymerase chain reaction(PCR). Milk, blood and serum were collected from a total of 64 dairy cattle with history of decreased milk production, vaccination, abortion, hygroma and retentio secundinae. The result showed that 64%, 34%, 45% and 26% samples were positive tested by MRT, RBT, CFT, and ELISA, respectively. The Kappa analysis showed that the confirmation CFT has poor to good agreement of 0.249, 0.511, and 0.710 with MRT, ELISA and RBT, respectively. None of blood and milk samples from serologically positive cattle were tested positive by PCR that could be due to the absence of bacteremia and bacterial shedding in milk. This finding suggests the presence of chronic infection among the studied animals, which characterized by high antibody levels in the absence of bacteria in the blood. Application of MRT and ELISA tests in parallel would increase the test sensitivity, while application of CFT and ELISA test or RBT and CFT in serial would increase the test specificity.
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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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