Judul: Membran Komposit Kitosan-Nanopartikel Magnetik Fe3O4-Hidroksiapatit untuk Rekayasa Jaringan Tulang.
Abstrak: Composite membrane implants from biodegradable and biocompatible polymers such as chitosan, added with Fe3O4 magnetic nanoparticleshydroxyapatite (MHAP) is an alternative that is appropriate for bone tissue engineering. The MHAP was first synthesized using coprecipitation method with 3 different composition, with the ratio of Fe3O4 : hydroxyapatite is 3:7, 4:6, and 5:5 by mass. The composite membrane chitosan-MHAP (MK K-MHAP) was then synthesized by mixing a chitosan solution and the best MHAP composition (10, 20, 30, and 40% w/w of the mass of chitosan). Characterization using X-ray diffraction confirmed the formation of Fe3O4 and hydroxyapatite phase on the MHAP. The magnetic saturation value and size of Fe3O4 magnetic nanoparticles increase with the increasing Fe3O4 composition in MHAP and MK K-MHAP which characterized based on its magnetic hysteresis and particle size distribution curve, respectively. The morphology of the best composition of MHAP composite was analysed using transmission electron microscope. Molecular interactions in MK K-MHAP was characterized based on infrared spectra. Immersion test of MK K-MHAP showed optimum state at 30% mass MHAP composition in chitosan matrix with calcium concentration released about 1000 ppm within 144 hours.
Keyword: biomedical, chitosan, composite membrane, hydroxyapatite, magnetite

Judul: Sintesis Komposit Hidroksiapatit dengan Variasi 10-50% Kitosan
Abstrak: In medical cases, HAp/chitosan composite can be used as a synthetic implantation in bone. Addition of chitosan on HAp seems produce good composite. Chitosan can reduce the properties of brittle HAp. XRD characterization on all samples showed that pattern has formed apatite dominated by the peak of HAp. The peak of chitosan on the results of XRD was not visible. It is due to chitosan has spread all over the samples. On FTIR characterization, the appearance of phosphate group and hydroxyl group show that HAp was identified in samples, while chitosan was indicated by the appearance of a group of NH, CO and CH. The results of observations with an optic stereo microscope, samples morphology showed that HAp was well distributed in chitosan. Test results of shore A test showed the addition of chitosan on HAp proved able to eliminate brittle properties of HAp. A lot of chitosan in the samples will reduce the hardness of the composition of the HAp / chitosan
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Judul: Karakteristik dan perilaku wirausaha pedagang pisang di Kota Bogor
Abstrak: Kewirausahaan ialah kemampuan menggerakkan orang-orang dan berbagai sumber daya untuk berkreasi, mengembangkan dan menerapkan solusi terhadap berbagai masalah agar dapat menciptakan makna dan memenuhi kebutuhan manusia. Hal tersebut memberikan pengaruh terhadap kemajuan perekonomian dan perbaikan pada keadaan ekonomi di Indonesia. Tujuan dari penelitian ini adalah untuk menganalisis karakteristik dan perilaku wirausaha pedagang pisang dan menganalisis hubungan antara karakteristik pedagang pisang dengan perilaku wirausahanya. Hasil penelitian menunjukkan bahwa karakteristik pedagang pisang di Kota Bogor sebagian besar berjenis kelamin laki-laki dan berusia diatas 49 tahun dengan persentase 45,71 persen. Dan menunjukkan bahwa jenjang pendidikan pedagang pisang jumlah terbanyak yaitu tamatan SLTA 62,86 persen. Pedagang pisang di Kota Bogor mempunyai perilaku wirausaha dalam kategori tinggi dengan persentase 248,8 persen, pengetahuan wirausaha sangat tinggi dengan persentase 85,83 persen, sikap wirausaha tinggi dengan persentase 78 persen dan tindakan wirausaha dalam kategori tinggi dengan persentase 84,97 persen. Karakteristik pedagang pisang di Kota Bogor yang berhubungan dengan perilaku wirausaha adalah lama usaha dan perilaku usaha.
Keyword: behavior, characteristics, Entrepreneurship