Judul: Jumlah Mikroorganisme pada Ayam Geprek di Sekitar Kampus Institut Pertanian Bogor Dramaga
Abstrak: Ayam geprek adalah ayam goreng tepung yang disajikan dengan cara digeprek dan merupakan salah satu makanan primadona di kalangan mahasiswa. Penelitian ini bertujuan mengidentifikasi jumlah mikroorganisme pada ayam geprek yang dijual di sekitar Kampus IPB Dramaga Bogor. Sampel ayam geprek dibeli dari 10 pedagang yang berlokasi di sekitar 200 meter dari batas luar kampus dengan total sampel berjumlah 30. Jumlah mikroorganisme dihitung menggunakan metode hitungan cawan sesuai dengan SNI Nomor 2897 Tahun 2008 tentang Metode Pengujian Cemaran Mikroba dalam Daging, Telur, dan Susu, serta Hasil Olahannya. Hasil pengujian menunjukkan jumlah rata-rata kontaminasi mikroorganisme pada sampel ayam geprek sebanyak 1.40 x 106 ± 1.82 x 106 cfu/g dengan jumlah minimum 1.50 x 103 cfu/g dan jumlah maksimum 8.90 x 106 cfu/g. Merujuk pada SNI Nomor 7388 Tahun 2009 tentang Batas Maksimum Cemaran Mikroba dalam Pangan, hanya 50% sampel ayam geprek yang memenuhi batas maksimum jumlah cemaran mikroba dan dari setiap rata-rata jumlah mikroorganisme hanya 3 pedagang yang memenuhi kriteria tersebut. Berdasarkan perhitungan jumlah mikroorganisme dengan uji Total Plate Count (TPC), kualitas mikrobiologi ayam geprek yang dijual di sekitar kampus IPB Dramaga Bogor kurang baik. Tingginya jumlah mikroorganise pada ayam geprek ini meningkatkan risiko terjadinya foodborne disease pada konsumen.
Keyword: ayam geprek, jumlah mikroorganisme, Kampus IPB Dramaga

Judul: Total Microorganisms in Fried Chicken Sold Inside the Campus of IPB University Dramaga Bogor
Abstrak: The aim of this research was to observe the microbiological quality of fried chicken sold inside the campus of IPB University Dramaga Bogor based on the total plate counts. The samples were bought from 12 vendors which sold fried chicken inside the campus of IPB University Dramaga Bogor. In every vendor would be taken 1 sample with 3 repetitions and totally obtained 36 samples. The samples were taken between 1-2 pm and then delivered to the laboratory at Division of Veterinary Public Health and Epidemiology, Faculty of Veterinary Medicine, IPB University using coolbox with the temperature of 5-7 ºC. At the same day the samples were subjected to the examination of total plate counts using plate count method based on the method in SNI 2897:2008 regarding the Examination Method on Microbial Contamination in Meat, Eggs, and Milk and Their Products. The result showed that the average of total plate counts in the samples were 8 056.0 ± 17 215.0 cfu/g. All of the samples were below the maximum limit in the SNI 7388:2009 about Maximum Limit of Microbial Contamination on Foods (maximum limit 100 000 cfu/g). The microbiological quality of fried chicken based on total plate counts sold in the campus of IPB Dramaga Bogor was good. Key words: campus of IPB University Dramaga Bogor, fried chicken, total plate counts., Penelitian ini bertujuan untuk menentukan kualitas mikrobiologis daging ayam goreng yang dijual di dalam Kampus IPB Dramaga Bogor berdasarkan jumlah total mikrob. Sampel ayam goreng dibeli dari 12 kantin yang menjual ayam goreng di dalam Kampus IPB Dramaga Bogor. Setiap kantin diambil 1 sampel dengan ulangan 3 kali sehingga diperoleh 36 sampel. Sampel ayam goreng diambil pada pukul 13:00-14:30 WIB dan dibawa ke Laboratorium Divisi Kesehatan Masyarakat Veteriner dan Epidemiologi, Fakultas Kedokteran Hewan, Institut Pertanian Bogor menggunakan coolbox dengan suhu 5-7 ºC. Sampel ayam goreng diuji pada hari yang sama terhadap jumlah mikroorganisme atau total plate count (TPC) dengan metode hitungan cawan berdasarkan metode SNI 2897:2008 tentang Metode Pengujian Cemaran Mikrob dalam Daging, Telur, dan Susu, serta Hasil Olahannya. Hasil penelitian ini menunjukkan bahwa rata-rata jumlah total mikrob dalam ayam goreng adalah 8 056.0 ± 17 215.0 cfu/g. Seluruh sampel ayam goreng berada di bawah batas maksimum ketetapan SNI 7388:2009 tentang Batas Maksimum Cemaran Mikrob pada Pangan (batas maksimum sebesar 100 000 cfu/g). Kualitas mikrobiologi sampel ayam goreng berdasarkan jumlah total mikrob yang dijual di dalam Kampus IPB Dramaga Bogor tergolong baik. Kata kunci: ayam goreng, jumlah hitungan cawan, Kampus IPB Dramaga Bogor
Keyword: campus of IPB University Dramaga Bogor, fried chicken, total plate counts, Ayam Goreng, Jumlah Hitungan Cawan, Kampus IPB Dramaga Bogor

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.
Keyword: