Judul: Persepsi, pengetahuan, dan perilaku pembelian online pada mahasiswa tingkat persiapan bersama (TPB) IPB
Abstrak: E-commerce merupakan bukti pesatnya perkembangan teknologi informasi. Online shop adalah salah satu wujud dari e-commerce. Penelitian ini bertujuan untuk menganalisis persepsi, pengetahuan, dan perilaku pembelian online pada contoh TPB IPB. Contoh penelitian ini adalah contoh aktif TPB IPB yang pernah belanja online dalam empat bulan terakhir. Penelitian ini melibatkan 100 contoh yang dipilih secara convenience. Pengambilan data dilakukan dengan wawancara menggunakan kuesioner. Data yang diperoleh dianalisis menggunakan statistik deskriptif dan inferensia. Hasil penelitian menunjukkan bahwa contoh memiliki persepsi setuju terhadap online shop dengan tingkat pengetahuan berada pada kategori sedang. Perilaku pembelian diukur menggunakan indikator utama yaitu frekuensi membeli dan anggaran belanja. Hasil uji korelasi menunjukkan bahwa uang saku, pekerjaan ibu, dan persepsi memiliki hubungan signifikan dengan frekuensi membeli. Selain itu, persepsi dan pendapatan/kapita/bulan memiliki hubungan signifikan dengan anggaran belanja. Sementara itu, hasil uji regresi menunjukkan bahwa frekuensi membeli dan anggaran belanja dipengaruhi oleh uang saku, sedangkan persepsi memengaruhi frekuensi membeli.
Keyword: Online shopping, Pengetahuan, Perilaku pembelian, Persepsi

Judul: Analisis niat pembelian produk melalui Online Shop pada Mahasiswa dengan pendekatan Theory Of Planned Behavior
Abstrak: Perkembangan internet memberikan dampak positif pada bidang perdagangan yang ditandai dengan lahirnya online shop. Sekarang ini, banyak online shop yang berkembang di Indonesia dengan berbagai macam bentuk seperti sebagai media perantara yang mempertemukan penjual dan pembeli di dunia maya. Tujuan penelitian ini adalah menganalisis pengaruh sikap terhadap perilaku, norma subjektif, dan kontrol perilaku yang dipersepsi terhadap niat pembelian di online shop. Penelitian ini mengggunakan design cross sectional-study dengan contoh sebanyak 100 mahasiswa Pascasarjana (S2) IPB yang tercatat aktif sebagai mahasiswa tahun ajaran 2013/2014. Teknik penarikan contoh penelitian ini adalah purposive sampling yang diambil secara proporsional dari 4 fakultas terpilih. Hasil penelitian menunjukkan bahwa karakteristik contoh yang memiliki hubungan dan pengaruh terhadap variabel Theory of Planned Behavior (TPB) adalah pendapatan, intensitas akses internet, jumlah sumber informasi, dan jumlah alasan membuka website. Sikap terhadap perilaku, norma subjektif, kontrol perilaku yang dipersepsi, dan niat pembelian saling berhubungan dan memengaruhi sesuai yang dihipotesiskan. Jadi, dapat dikatakan bahwa penelitian ini sesuai dengan Theory of Planned Behavior., the birth of online shop. Nowadays, many online shops grow in Indonesia on many forms such as online media that bring together the sellers and buyers in virtual world. The purpose of this study was to analyze the influence of attitudes toward behavior, subjective norms, and perceived control behavior toward purchase intentions through online shop. This research used cross-sectional design with 100 postgraduate students (S2) of IPB who are active as a student of 2013/2014 academic year. Sampling technique of this study was purposive sampling taken proportionally from 4 selected faculties. The result showed that the sample’s characterisric who have correlation and influence toward the Theory of Planned Behavior (TPB) variables were income, internet access intensity, mount of information resources, and mount of reasons to access the website. Attitude toward behavior, subjective norm, perceived control behavior, and purchase intention were interconnected and influenced appropriate with the hyphotesis. So, it can be said that this study was consistent with TPB
Keyword: Niat pembelian, Online shopping, Theory of Planned Behavior

Judul: Pemurnian dan karakterisasi protein inhibitor RNA helikase virus hepatitis C
Abstrak: Hepatitis C virus (HCV) infection is the second most common chronic viral infection in the world with global prevalence. This infection is contribution to chronic hepatitis and liver cirrhosis, often leading to hepatocellular carcinoma. There is no effective drug and vaccine available against HCV. The current standard treatment, a combination of pegylated interferon-α with ribavirin, is limited by its suboptimal response rate in a significant patient population, side effects, and affordability. Therefore, development of effective drug is needed. One approach to find out the candidate of antiviral drug is to discover the inhibitor of enzyme that essential for virus replication, such as RNA helicase. Streptomyces chartreusis 5-095 produce the inhibitor of HCV RNA helicase. The aim of this study was to purify the protein inhibitor which has inhibition activity against ATPase activity of RNA helicase HCV from S. chartreusis 5-095. The supernatant of culture S. chartreusis 5-095 exhibited high inhibiton activity against ATPase activity of RNA helicase HCV (approximately 72%) at 10 days of incubation. The extracellular protein inhibitor was partially purified by procedures of precipitation with ammonium sulfate to 65% saturation and gel filtration (Sephadex G50) using methanol water solution (4:6) as an eluen. The purity of protein inhibitor was monitored by SDS PAGE. The protein inhibitor showed a relative molecular mass were estimated to be 14 kDa and increased the purity 23,08 fold than those of the crude protein. The specific activity and IC50 after purification were 13,1338 U/mg and 0,0767 mg/mL, respectively. The activity of purified protein inhibitor showed its stability over pH range from 5-8 and optimum at pH 7,4. The inhibition activity showed its stability up to 70% at temperature 100 oC. The purified protein inhibitor relatively stable its activity at storage in the range of -20 oC to room temperature for 35 days.
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