Judul: Uji stabilitas IgG anti Escherichia coli K99 asal kolostrum sapi dalam kemasan mikrokapsul
Abstrak: The function of microencapsulation technique is to protect the IgG anti Escherichia coli (E. coli) K99 from bovine colostrum towards pH effect in the digestive tract so it can work effectively. The objective of this experiment is to evaluate the stability of IgG anti E. coli K99 from bovine colostrum in microcapsule using agar gel presipitation test (AGPT) and enzyme linked immunosorbent assay (ELISA) techniques. Purified IgG from colostrum were packaged in the form of coated-microcapsules 30 and 60 minutes. The occurrence and spesificity of IgG anti E. coli in was observed in microcapsules diluted with 0.2 M NaHCO3 and 0.06 M Na3C6H5O7.2H2O buffer pH 8. The dilution was subsequently subjected to acid and alkali condition (8, 4, and 9). The IgG anti E. coli occurrence was detected with indirect ELISA technique, while it specificity were detected by AGPT and indirect ELISA techniques. The result show that total IgG concentration from coated microcapsules of 30 and 60 minutes were 0.971– 1.012 μg/ 100 μl. ELISA and AGPT showed negative reaction between microcapsule diluted IgG anti E. coli againts E. coli K99 antigens, in contras with positive reaction in IgG anti E. coli uncoated. The negative result suspected due to the destruction of IgG anti E. coli during the dilution process.
Keyword: Bogor Agricultural University (IPB), microcapsule, IgG, ELISA, E. coli K99, AGPT

Judul: Evaluasi morfologi mikrokapsul tersalut alginat-kitosan yang mengandung IgG anti-Escherichia coli asal kolostrum sapi
Abstrak: The objective of this experiment was to evaluate the morphology of alginatechitosan coated microcapsule consist of anti E. coli IgG derived from bovine colostrum. Pure IgG anti E. coli were obtained from colostrum collected from cows vaccinated by polyvalent E. coli vaccine. The IgG were purified and packed in form of alginate chitosan coated microcapsule. The microcapsules were made by extruction method, using Microencapsulator with 30 and 60 minutes coating time in chitosan, respectively. Microcapsules then be evaluated by using Scanning Electron Microscope. Results of the experiment indicated that there was no significant different in the formation of microcapsules between 30 and 60 minutes coating time. The microscopic evaluation has indicated the smoother surface of microcapsules coated in 60 minutes . In conclusion, the IgG microcapsules with the 60 minutes coating time better than of those coated in 30 minutes.
Keyword: Bogor Agricultural University (IPB), SEM, chitosan, alginate, micrcapsule, IgG, colostrum

Judul: Desain model flapping blade vertical axis wind turbine untuk meningkatkan efisiensi konversi energi angin
Abstrak: Angin merupakan salah satu sumber energi terbarukan yang ramah lingkungan. Untuk memaksimalkan pemanfaatan energi angin, desain baru turbin angin pasti dibutuhkan. Penelitian ini bertujuan untuk melihat pengaruh flapping blade pada turbin angin dengan sumbu tegak. Desain turbin yang digunakan pada penelitian ini dimodifikasi dari profil sayap pesawat NACA 6412. Perbedaan jumlah sudu (3, 5, dan 7) digunakan pada penelitian ini. Turbin angin ini diuji dengan menggunakan wind tunnel yang memiki kecepatan angin dengan rentang 0–6 m/s. Performa pada turbin angin tersebut dievaluasi pada beberapa parameter yaitu TSR, torsi, daya angin, daya turbin, dan efisiensi turbin. Hasil yang didapatkan bahwa turbin angin dengan 7 blade memiliki daya turbin yang lebih efisien yaitu 8.532 %.
Keyword: flapping blade, VAWT, the power of wind turbine, efficiency of turbine