Judul: Kajian Myelositomatosis pada Ayam Kampung Betina.
Abstrak: Kejadian berbagai jenis tumor atau neoplasia pernah dilaporkan pada unggas, baik yang telah mengalami domestikasi maupun unggas liar. Salah satunya adalah myelositomatosis yang disebabkan oleh Avian Leukosis Virus subgroup I. Tujuan dari studi kasus ini untuk melihat keberadaan sel myelosit pada sumsum tulang sebagai tempat pembentukan sel-sel darah dan ovarium sebagai media penularan secara vertikal dari induk ke anak. Spesimen dalam studi ini berjumlah 10 ekor ayam yang berumur 4-6 bulan. Hasil pengamatan menunjukkan adanya kelompok-kelompok sel myelosit dalam jumlah beragam pada sumsum tulang dan ditemukannya kelompok sel myelosit pada 9 ovarium. Walaupun sampai saat ini belum ada kajian khusus mengenai histologi ayam kampung namun hasil pengamatan secara histopatologi menunjukkan adanya indikasi ayam terkena myelositomatosis.
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Judul: Kajian myelositomatosis pada ayam broiler sebagai imunosupresor
Abstrak: Myelocytomatosis or myeloid leucosis (ML) is a kind of neoplastic disease caused by Avian leucosis virus subtype J (ALV–J) infection, which often found in chickens worldwide. Myelocytomatosis in chickens cause reduced productivity and increased mortality in flocks. The aim of this study was to make pathological assessment of ML occurred in a broiler farm. Increased mortality with breathing difficulty (dyspnoea) were noted in broiler flocks aging 7 and 14 days. Afterwards necropsy was performed and organs were sampled for histopathological examinations. All organs were embedded in paraffin, sectioned at 5 μm, and stained with hematoxylin and eosin (for morphology), periodic acid–Schiff for carbohydrates, and Masson trichrome for collagens. Histopathological findings of ML included scattered myeloid cells depositions in the interstitium and perivascular area of kidney, liver, lung, and heart. Additionally, high percentage (>70%) of myeloid cells were found in the bone marrow. In addition to ML in various organs, there were invasive granulomatous pneumonia comprises of poorly demarcated fibrous bands, and septate fungal hyphae which consistent with the morphology of Aspergillus spp. Myelocytomatosis were also detected in the breeder flocks aging 29 weeks, notably in liver and ovaries. These findings suggest that vertical ML transmission may cause immunosupression which lead to invasive granulomatous lesion. Invasive granulomatous pneumonia with ML has never been documented in poultry.
Keyword: Bogor Agricultural University (IPB), myelocytomatosis., invasive granulomatous pneumonia, broiler, aspergillosis

Judul: Numerical modeling of the hydrodynamics of standing wave and scouring in front of impermeable breakwater with different steepnesses
Abstrak: The aim of this paper is to numerically study the effects of breakwater steepness on the hydrodynamics of standing wave and scouring process in front of impermeable breakwaters. A two-dimensional hydrodynamics model based on the Reynolds Averaged Navier–Stokes (RANS) equations and the Volume of Fluid (VOF) method was developed and then combined with an empirical sediment transport model. Comparisons with an analytical solution and experimental data showed the present model is very accurate in predicting the near bottom velocity and capable of simulating the scour/deposition patterns consistent with experimental data. It was found that the additional terms of bottom shear stress in the momentum equations are necessary to produce a physical scouring pattern. Different breakwater steepnesses produce different characteristics of standing wave, the steady streaming system, and scouring pattern in front of the breakwaters, which also affects the correlations between them. An additional analysis of the turbulence field parameters and the sediment transport rate was also performed. All these important information will be presented in details in this paper and can be worthwhile for designing the breakwater in coastal areas.
Keyword: The RANS–VOF model Standingwave Steadystreamingsystem Scouring pattern Breakwatersteepness