Judul: Identifikasi Bakteri Berdasarkan Pewarnaan Gram Penyebab Mastitis Subklinis pada Sapi Perah di Kawasan Peternakan Bogor
Abstrak: Salah satu penyebab penurunan produksi susu sapi perah di Indonesia adalah mastitis subklinis. Tujuan penelitian ini adalah mengidentifikasi bakteri penyebab mastitis subklinis pada sapi perah berdasarkan pewarnaan Gram di kawasan peternakan Bogor. Pengambilan sampel dilakukan di Cibungbulang, Kebon Pedes, Tajur Halang, dan Tapos. Identifikasi bakteri penyebab mastitis subklinis dilakukan berdasarkan pewarnaan Gram dan dianalisis secara deskriptif. Sebanyak 188 sampel susu yang diperoleh, didapatkan 127 sampel dinyatakan terindikasi berasal dari sapi yang menderita mastitis subklinis berdasarkan uji mastitis IPB-1. Melalui kultur bakteri dari sampel susu, diperoleh 149 isolat murni bakteri yang terdiri dari 121 isolat bakteri Gram positif dan 28 isolat bakteri Gram negatif. Hasil penelitian menunjukkan bahwa bakteri Gram positif merupakan penyebab utama mastitis subklinis pada peternakan sapi perah di wilayah Bogor.
Keyword: Gram positif, Gram negatif, mastitis subklinis, susu

Judul: Kejadian mastitis subklinik yang disebabkan oleh staphylococcus sp. di peternakan sapi perah wilayah Cisurupan, Bayongbong, dan Cibungbulang
Abstrak: Penelitian ini bertujuan untuk mengkaji tingkat kejadian mastitis dan derajat patogenitas Staphylococcus pada peternakan sapi perah di wilayah Cisurupan, Bayongbong, dan Cibungbulang. Materi yang digunakan dalam penelitian adalah 250 sampel susu yang telah diuji CMT dan berasal dari 65 ekor sapi perah di daerah Bogor dan Garut. Penelitian dilakukan dengan metode TPC, dan uji karakterisasi isolat. Uji karakterisasi isolat meliputi penanaman isolat di agar BPA, agar darah, pewarnaan Gram, uji gula-gula (manitol dan glukosa), uji katalase, dan uji koagulase. Berdasarkan hasil uji CMT diketahui prevalensi mastitis subklinis tertinggi berada di wilayah Cibungbulang (100 %), diikuti oleh Cisurupan (94,84 %), dan Bayongbong (93,50 %). Hasil ini sejalan dengan data TPC, dimana nilai TPC tertinggi berada di wilayah Cibungbulang (1.764.613 cfu/ml), diikuti Cisurupan (1.309.490 cfu/ml), dan Bayongbong (1.094.470 cfu/ml). Tingkat patogenitas tertinggi oleh Staphylococcus sp. berada di wilayah Cisurupan (82,22 %), diikuti Cibungbulang (78,84 %), dan Bayongbong (24 %).
Keyword: CMT, Sapi perah, Mastitis, Staphylococcus sp., Bogor Agricultural University

Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell