Judul: Tabel volume lokal pohon sengon (Paraserianthes falcataria) di Kebun Glantangan Jember, PTPN XII Jawa Timur
Abstrak: Paraserianthes falcataria known as sengon is one of fast growing spesies for industrial forest plantation in Indonesia. The objective of this research was to estimate volume of certain trees in a forest stand. The tree dimension that used was diameter at breast high (dbh) on 120 sample trees that were selected using purposive sampling technique. The estimation of trees volume was based on measurement of fallen trees. The result of the research showed that the best model fit to criteria of model determination: cofficient of determination (R2), standard error, and Ftest, was V = - 0,193 + 0,0170D + 0,00032D2 with R2 values of 98,4% and standard error was 0,023. The accuracy of the regression model was qualified due to RMSE value of 11,25%.
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Judul: Penyusunan Tabel Volume Lokal Jenis Keruing (Dipterocarpus spp.) di IUPHHK-HA PT. Sarmiento Parakantja Timber, Kalimantan Tengah
Abstrak: In order for the forest sustainability can be ensured, need to do a good forest management plan, careful and accurate information and reliable. The information needed is data about the potential of forest stands. Potential prediction of forest stands are related to the timber volume prediction. To collect such information, then the forest inventory of activities needs to be done. One of the tools to simplify and accelerate the activities of forest inventory is the volume table. Prediction tree stand volume by using the volume table will be more efficient and save costs and time. The purpose of this research is to develop a local volume table of keruing (Dipterocarpus spp.) in the area of IUPHHK-HA PT. Sarmiento Parakantja Timber, Central Kalimantan. The table volume made is table volume premises with diameter of trees as high as the chest (Dbh) as free variables. The preparation of a volume table is done using three models a regression equation with a diameter as free variables. A model of an equation probe volume was selected from third best model the regression equation is based on criteria test statistics in the preparation and validation model. The test criteria, namely the coefficient of determination (R2), standard deviation (s), diversity analysis, refraction, aggregate deviation (SA), average deviation (SR), the Root Mean Square Error (RMSE), and mean difference test chi-squared (χ2). Based on these criteria, the model equations estimators keruing (Dipterocarpus spp.) is a model equation Berkout V = 0, 0003631Dbh2, 26 with the value s = 0,059, R2 = 98,70%, Fhitung = 4875,51%, bias = 14,81%, SA = 0,03, SR = 11,04%, RMSE = 19,12,% and χ2 = 1,37.
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Judul: Free Energy from COM Pulling for Membrane Fusion of Human Immunodeficiency Virus Type 1 (HIV-1)
Abstrak: HIV-1 menginfeksi sel target melalui fusi membran dan memediasi sel dengan glikoprotein. Protein gp41 yang sudah terintegrasi dengan membran target akan melipat kembali membentuk 6 bundel heliks bersama protein gp120. Pelipatan kembali struktur protein dapat dicegah menggunakan inhibitor sehingga proses 6 bundel heliks tidak terbentuk. Inhibitor masih bersaing dengan protein dalam hal pelipatan struktur, sehingga perlu dicari besaran energi yang mewakili pelipatan protein. Energi bebas diperoleh dari tarikan COM mewakili kerja yang dilakukan protein untuk melipat kembali. Energi bebas hasil simulasi bernilai -82.4 kJ mol-1 dan energi bebas varian covNHR memiliki nilai sebesar -75 kJ mol-1 dan -45 kJ mol-1. Karakteristik termodinamika dan spektrum UV pada varian covNHR-VQ memiliki afinitas pengikatan yang tinggi serta interaksi yang kuat terhadap peptida protein gp41, sedangkan covNHR-ER memiliki basis pengikatan dan interaksi lebih lemah dibanding covNHR-VQ. Varian covNHR-VQ memiliki nilai energi bebas mendekati energi bebas tarikan COM, sehingga varian memiliki interaksi yang kuat ketika energinya mendekati energi bebas tarikan. Aktivitas inhibitor mencegah protein terlipat kembali sehingga performa pencegahan yang baik yaitu saat energinya bernilai sama atau lebih dari energi saat protein tersebut terlipat. Energi bebas dapat didekatkan sebagai parameter dalam menganalisis interaksi antara inhibitor dengan protein gp41., HIV-1 infects cell through membrane fusion and mediates cell with glycoproteins. The gp41 protein has been integrated with target membrane will be refolding form. Protein folding structure can be prevented using inhibitors. Inhibitor competes with protein in folding structure, so have to find the energy that represents protein folding. Free energy obtained from COM pulling represents the work that protein does refold back. Free energy of simulation results is -82.4 kJ mol-1 and free energy of covNHR variant has a value of -75 kJ mol-1 and -45 kJ mol-1. The thermodynamics and UV spectrum characteristics of covNHR-VQ have a high binding affinity and strong interaction than covNHR-ER. covNHR-VQ has free energy close to free energy from COM puling, and variant has strong interaction when the energy apporaches free energy pulling.
Keyword: COM Pulling, Free Energy, gp41 Protein, HIV-1