Judul: Pengaruh populasi dan jarak tanam terhadap intersepsi radiasi, pertumbuhan dan produksi tanaman jagung (Zea mays L.)
Abstrak: Pertumbuhan dan produksi tanaman banyak ditentukan oleh faktor lingkungan baik faktor biotik maupun faktor abiotik. Diantara faktor abiotik tersebut faktor iklim terutama radiasi surya sangat besar pengaruhnya terhadap pertumbuhan dan produksi tanaman. Surya merupakan satu- satunya sumber energi bagi makhluk hidup. Penelitian ini bertujuan untuk mengetahui populasi dan jarak tanam opti- mum yang dapat mengintersepsi radiasi semaksimal mungkin sehingga dapat diharapkan produksi yang tinggi, disamping itu juga untuk mengetahui pengaruh populasi dan jarak ta- nam terhadap suhu dan albedo tanaman. 41 Percobaan dilakukan di Kebun Percobaan IPB Darmaga VII yang dimulai pada bulan Desember 1982 sampai bulan Maret 1983. Penelitian ini menggunakan rancangan petak terpisah (Split Plot Design) dengan 4 tingkat populasi sebagai petak utama dan 2 tingkat jarak tanam sebagai anak petak. Hasil yang diperoleh menunjukkan bahwa populasi ber- pengaruh nyata terhadap intersepsi radiasi sampai pada ba- tas tertentu sesuai dengan perkembangan indeks luas daun dan umur tanaman. Intersepsi merupakan fungsi dari ILD ...
Keyword: 

Judul: Pengaruh jarak tanam dan besarnya populasi tanaman terhadap absorpsi radiasi surya dan produksi tanaman jagung (Zea mays L.)
Abstrak: Produksi tanaman di tentukan oleh faktor genetik dan lingkungan tanaman yang berinteraksi dengannya. Berbagai usaha manusia memodifikasikan pertanaman dan lingkungan ditujukan untuk memanfaatkan semua energi yang tersedia demi kenaikan produksi.
Keyword: 

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.
Keyword: